阅读说明：本技术 便携式椅子及形成便携式椅子的方法 (Portable chair and method of forming a portable chair ) 是由 威廉·S·杜兰 史蒂夫·查尔斯·尼科尔斯 罗伊·约瑟夫·塞德斯 于 2018-05-23 设计创作，主要内容包括：本发明提供了一种便携式椅子,所述便携式椅子可包括通过前滑橇连接的第一前椅腿和第二前椅腿以及通过后滑橇连接的第一后椅腿和第二后椅腿。所述前滑橇可包括第一前支脚和第二前支脚,并且所述后滑橇可包括第一后支脚和第二后支脚。所述支脚中的每个附接到所述前滑橇和所述后滑橇,并且可包括保持特征孔,所述保持特征孔被构造为允许水从所述滑橇/支脚接口中排出。所述便携式椅子可进一步包括椅座,所述椅座包括椅座框架边界,所述椅座框架边界包括多个突出部。所述椅座框架边界可通过注射成型工艺刚性附接到所述椅座。所述便携式椅子还可包括椅座框架,所述椅座框架边界的所述多个突出部被构造为可移除地附接到所述椅座框架。(The present invention provides a portable chair that may include first and second front legs connected by a front sled and first and second rear legs connected by a rear sled. The front sled can include a first front leg and a second front leg, and the rear sled can include a first rear leg and a second rear leg. Each of the feet is attached to the front skid and the rear skid and may include a retention feature hole configured to allow water to drain from the skid/foot interface. The portable chair may further comprise a seat comprising a seat frame boundary comprising a plurality of projections. The seat frame boundary may be rigidly attached to the seat by an injection molding process. The portable chair may also include a seat frame, the plurality of projections of the seat frame boundary being configured to be removably attached to the seat frame.)

1. A portable chair, comprising:

the chair comprises a first front chair leg and a second front chair leg, wherein the first front chair leg is connected with the second front chair leg through a front skid;

the first rear chair leg is connected with the second rear chair leg through a rear skid;

a seat comprising a seat frame boundary, wherein the seat has a highly permeable woven construction, and wherein the seat frame boundary is a rigid overmold rigidly attached to the seat by an injection molding process;

wherein the injection molding process forms a plurality of protrusions on an underside portion of the seat frame perimeter; and

a seat frame comprising a first end, a second end, and a seat attachment rail, wherein the plurality of protrusions on the lower portion of the seat frame boundary are configured to removably engage with the seat attachment rail.

2. The portable chair of claim 1, wherein the seat frame further comprises a carrying handle, and wherein the carrying handle is configured to receive the seat frame perimeter.

3. The portable chair of claim 1, wherein the seat frame further comprises a seat handle comprising a side opening, and wherein the seat frame perimeter comprises a carry handle side cover for covering the side opening.

4. The portable chair of claim 1, wherein the seat attachment rail comprises a plurality of slots configured to receive the plurality of projections, and wherein the seat attachment rail further comprises a groove, and the seat frame perimeter further comprises a series of ribs, and the groove supports the series of ribs, the ribs configured to relieve loading of the plurality of projections on the seat frame perimeter.

5. The portable chair of claim 4, wherein the plurality of projections each comprise spaced apart projections that extend perpendicular to the plurality of slots when the plurality of projections are positioned in the plurality of slots in the seat attachment rail to lock the seat frame perimeter to the seat frame.

6. The portable chair of claim 4, wherein the series of ribs abut a flange extending from the lower portion of the seat frame perimeter.

7. The portable chair of claim 4, wherein the seat frame perimeter is secured to the seat frame by positioning a first end of the seat frame perimeter in the first end of the seat frame and rolling and flexing the seat frame perimeter from the first end of the seat frame to a second end of the seat frame, aligning the plurality of protrusions with the plurality of slots in the seat attachment rails to lock seat frame perimeter in place on the seat frame.

8. The portable chair of claim 4, wherein the plurality of projections each comprise a screw interface protrusion, and wherein the seat frame perimeter is secured to the seat frame by at least one screw inserted into at least one of the plurality of projections in a state in which the plurality of projections are inserted into the plurality of slots.

9. The portable chair of claim 1, further comprising:

a first front chair leg joinery interface comprising a tubular projection onto which the first front chair leg is configured to be inserted and welded, an

A first rear chair leg joinery interface including a tubular projection, the first rear chair leg configured to be inserted and welded onto the tubular projection.

10. The portable chair of claim 9, further comprising:

a first armrest configured to be rotatably secured to the first front leg joinery interface and the first rear leg joinery interface by a first front pin.

11. The portable chair of claim 9, further comprising:

a second front chair leg joinery interface comprising a tubular projection, the second front chair leg configured to be inserted and welded onto the tubular projection; and

a second rear chair leg joinery interface including a tubular projection, the second rear chair leg configured to be inserted and welded onto the tubular projection.

12. The portable chair of claim 11, further comprising:

a second armrest configured to be rotatably secured to the second front leg joinery interface and the second rear leg joinery interface by a second front pin.

13. The portable chair of claim 1, further comprising:

a backrest comprising a backrest frame boundary, wherein the backrest has a high permeability woven construction, and wherein the backrest frame boundary is a rigid overmold rigidly attached to the backrest by an injection molding process;

wherein the injection molding process forms a plurality of protrusions on a back side portion of the back frame border; and

a back frame comprising a first end, a second end, a first back attachment rail, and a second back attachment rail, wherein the plurality of protrusions on the back side portion of the back frame boundary are configured to removably engage the first back attachment rail and the second back attachment rail.

14. The portable chair of claim 13, further comprising:

a first back joinery interface comprising a tubular projection,

the first end of the back frame is configured to be inserted and welded onto the tubular projection; and

a second back joinery interface comprising a tubular projection,

the second end of the back frame is configured to be inserted and welded onto the tubular projection.

15. The portable chair of claim 14, further comprising:

a first seat joinery interface comprising a tubular projection,

the first end of the seat frame is configured to be inserted and welded onto the tubular projection; and

a second seat joinery interface comprising a tubular projection,

the second end of the seat frame is configured to be inserted and welded onto the tubular projection.

16. The portable chair of claim 15, wherein each of the first front leg, the second front leg, the front sled, the first rear leg, the second rear leg, the rear sled, the seat frame, and the back frame is comprised of hydroformed aluminum, and wherein the front sled comprises a first front foot and a second front foot, and the rear sled comprises a first rear foot and a second rear foot, and wherein each of the first front foot, the second front foot, the first rear foot, and the second rear foot comprises a retention feature hole configured to allow water to drain from an interface between the foot associated with the retention feature hole and the particular sled to which the foot is attached.

17. A method, comprising:

inserting a rearmost attachment screw interface on a first side of a seat frame border attached to a seat by an injection molding process into a rearmost attachment hole of a first side attachment rail attached to the seat frame and inserting a rearmost attachment screw interface on a second side of the seat frame border into a rearmost attachment hole of a second side attachment rail attached to the seat frame;

inserting first and second medial attachment screw interfaces on the first side of the seat frame boundary into first and second medial attachment holes of the first side attachment rail and inserting first and second medial attachment screw interfaces on the second side of the seat frame boundary into first and second medial attachment holes of the second side attachment rail;

inserting a front-most attachment screw interface on the first side of the seat frame boundary into a front-most attachment hole of the first side attachment rail and a front-most attachment clamp on the second side of the seat frame boundary into a front-most attachment hole of the second side attachment rail;

aligning a front attachment clamp on a third side of the seat frame perimeter with a front attachment hole on a first end of a carry handle attached to the seat frame and aligning a front attachment clamp on the third side of the seat frame perimeter with a front attachment hole on a second end of the carry handle; and

inserting the front attachment clip on the first side of the seat frame boundary into the front attachment hole on the first end of the carrier handle and inserting the front attachment clip on the second side of the seat frame boundary into the front attachment hole on the second end of the carrier handle.

18. The method of claim 17, further comprising:

removing the screw cover plate of the first side attachment rail and the screw cover plate of the second side attachment rail; and

inserting a screw into each of the rearmost, first, second and foremost side attachment screw interfaces on the first side of the seat frame perimeter and into each of the rearmost, first, second and foremost side attachment screw interfaces on the second side of the seat frame perimeter to secure the seat to the seat frame.

19. The method of claim 18, wherein the seat is rolled from the back side to the front side during assembly of the seat to the seat frame.

20. The method of claim 19, wherein the seat frame boundary includes a rear rib between the rearmost attachment screw interface and the first medial attachment screw interface, a medial rib between the first medial attachment screw interface and the second medial attachment screw interface, and a front rib between the second medial attachment screw interface and the frontmost attachment screw interface on the first side, and a rear rib between the rearmost attachment screw interface and the first medial attachment screw interface, a medial rib between the first medial attachment screw interface and the second medial attachment screw interface, and a front rib between the second medial attachment screw interface and the frontmost attachment screw interface on the second side.

Technical Field

Aspects described herein relate generally to portable chairs. More particularly, these aspects relate to a portable, foldable chair.

Background

Portable chairs are commonly used in events and activities that require a seat, but are not always available, such as travel picnics, camping, and outdoor barbecuing. However, in most cases, such chairs are made of inexpensive low end materials that provide an uncomfortable seating experience, are poorly durable, have extremely low long term use, and are prone to accelerated degradation when exposed to environmental phenomena. Therefore, the overall user satisfaction of the low-end portable chair is low, and the replacement frequency is high.

In other cases, portable chairs are manufactured using higher quality materials, which may result in longer service lives than lower end products. However, such high-end chairs offer only slight improvements in comfort, resistance to weather-induced deterioration, and overall durability, while being much more expensive.

Therefore, there is a need for a portable chair that is high quality, comfortable, and durable.

Disclosure of Invention

The following presents a simplified summary of various aspects described herein. This summary is not an extensive overview, and is not intended to identify key or critical elements or to delineate the scope of the claims. The following summary merely presents some concepts in a simplified form as a prelude to the more detailed description provided below.

To overcome the limitations in the prior art described above, and to overcome other limitations that will be apparent upon reading and understanding the present specification, aspects described herein relate to a portable chair and a method of forming a portable chair.

According to one or more embodiments, a portable chair may include first and second front legs connected by a front sled and first and second rear legs connected by a rear sled. The front sled can include a first front leg and a second front leg, and the rear sled can include a first rear leg and a second rear leg. Each of the feet is attached to the front and rear skids and may include retention feature holes configured to allow water to drain from the skid/foot interface. The portable chair may further include a seat having a high permeability woven construction and may include a seat frame boundary. The seat frame boundary may be a rigid thermoplastic overmold that includes a plurality of projections on a lower portion. The seat frame boundary may be rigidly attached to the seat by an injection molding process that may form a plurality of protrusions. The portable chair may also include a seat frame including a first end, a second end, a first seat attachment rail, and a second seat attachment rail. The plurality of projections of the lower portion of the seat frame boundary may be configured to removably engage with the first and second seat attachment rails. Additionally, the seat frame may include a carrying handle.

In some embodiments, the seat can be configured to tilt downward at the front end with the seat frame boundary of the seat removably engaged with the first and second seat attachment rails.

In some embodiments, the portable chair may further comprise a first front leg joinery interface comprising a tubular projection, the first front leg may be configured to be inserted into the tubular projection and secured thereto by a structural adhesive. The portable chair may also include a first rear leg joinery interface including a tubular projection, and the first rear leg may be configured to be inserted into the tubular projection and secured thereto by a structural adhesive.

In some embodiments, the portable chair may further comprise a first armrest, which may be configured to be rotatably secured to the first front leg joinery interface and the first rear leg joinery interface by a first front pin.

In some embodiments, the portable chair may further comprise a second front leg joinery interface comprising a tubular projection, the second front leg may be configured to be inserted into the tubular projection and secured thereto by a structural adhesive. The portable chair may also include a second rear leg joinery interface including a tubular projection, and the second rear leg may be configured to be inserted into the tubular projection and secured thereto by a structural adhesive.

In some embodiments, the portable chair may further comprise a second armrest, which may be configured to be rotatably secured to the second front leg joinery interface and the second rear leg joinery interface by a second front pin.

In some embodiments, the portable chair may further comprise a backrest having a high permeability woven construction and may include a backrest frame border. The back frame border may be a rigid thermoplastic overmold that includes a plurality of protrusions in a back side portion. The backrest frame border may be rigidly attached to the backrest through an injection molding process that may form the plurality of protrusions. The portable chair may also include a back frame including a first end, a second end, a first back attachment rail, and a second back attachment rail. The plurality of protrusions of the back side portion of the back frame boundary may be configured to removably engage with the first back attachment rail and the second back attachment rail.

In some embodiments, the portable chair may further comprise a first back joinery interface. The first back joinery interface may include a tubular projection, and the first end of the back frame may be configured to be inserted into and secured to the tubular projection by a structural adhesive. The portable chair may also include a second back joinery interface. The second back joinery interface may include a tubular projection, and the second end of the back frame may be configured to be inserted into and secured to the tubular projection by a structural adhesive.

In some embodiments, the portable chair may further comprise a first seat joinery interface. The first seat joinery interface may comprise a tubular projection, and the first end of the seat frame may be configured to be inserted into and secured to the tubular projection by a structural adhesive. The portable chair may also include a second seat joinery interface. The second seat joinery interface may comprise a tubular projection, and the second end of the seat frame may be configured to be inserted into and secured to the tubular projection by a structural adhesive.

In some embodiments, the first front leg, the second front leg, the front sled, the first rear leg, the second rear leg, the rear sled, the seat frame, and the back frame may be constructed of hydroformed aluminum.

These features, as well as many others, will be discussed in more detail below.

Brief description of the drawings

A more complete understanding of the aspects and advantages thereof described herein may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein:

fig. 1 is a front perspective view of one example of a portable chair according to one or more aspects described herein.

Fig. 2A, 2B, and 2C respectively illustrate front perspective views of an exemplary portion of the exemplary portable chair of fig. 1, according to one or more aspects described herein.

Fig. 3 is a side perspective view of the example portable chair of fig. 1, according to one or more aspects described herein.

Fig. 4A, 4B, 4C, and 4D illustrate, respectively, an underside perspective view of a first example seat, a top perspective view of the first example seat frame, a cross-sectional view of the first example seat engaged with the first example seat frame, and an exploded view of the first example seat and components of the first example seat frame of the example portable chair of fig. 1, in accordance with one or more aspects described herein.

Fig. 5A, 5B, 5C, 5D, and 5E illustrate, respectively, a front perspective view of a second exemplary seat frame, a front perspective view of a second exemplary seat, a lower perspective view of a second exemplary seat, a cross-sectional view of a second exemplary seat engaged with the second exemplary seat frame, and a front perspective view of a second exemplary seat engaged with the second exemplary seat frame of the exemplary portable chair of fig. 1, according to one or more aspects described herein.

Fig. 6A, 6B, and 6C illustrate a rear view of an exemplary backrest, a front view of an exemplary backrest frame, and a cross-sectional view of an exemplary backrest engaged with the exemplary backrest frame of the exemplary portable chair of fig. 1, respectively, according to one or more aspects described herein.

Fig. 7A and 7B illustrate a front perspective view and a portion of the example portable chair of fig. 1 in a folded configuration, respectively, according to one or more aspects described herein.

Detailed Description

In the following description of various examples and components of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration various exemplary structures and environments in which aspects of the disclosure may be practiced. It is to be understood that other structures and environments may be utilized and structural and functional modifications may be made in accordance with the specifically described structures and methods without departing from the scope of the present disclosure.

Additionally, while the terms "top," "bottom," "front," "side," "back," "upward," "downward," "right," "left," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience, e.g., based on the example orientations shown in the figures or orientations during conventional use. In addition, the term "plurality" as used herein means any number greater than 1, either separately or in combination, up to an infinite number if desired. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures without departing from the scope of the invention. Additionally, the reader is advised that the drawings are not necessarily drawn to scale.

Overview of the chair

Fig. 1 illustrates a front perspective view of one example of a chair 100, which may be a foldable portable chair. Chair 100 may include a front sled 110 connecting front legs 112A and 112B and a rear sled 120 connecting rear legs 122A and 122B. The front sled 110 and the rear sled 120 may be configured to support the chair 100 on a surface. The front legs 112A and 112B may be further connected by a front crossbar 114 and reinforced by the front crossbar 114. The chair 100 may also include a seat 130 connected to a seat frame 131 and a back 140 connected to a back frame 141. The chair 100 may include armrests 150A and 150B. As described in further detail below, the chair 100 may be configured to fold into a smaller profile for storage and transport.

Additionally, the chair 100 may have a symmetrical configuration in which components of the left side of the chair 100 (e.g., the side corresponding to the armrest 150B) are mirrored to the right side (e.g., the side corresponding to the armrest 150A). Accordingly, the front legs 112B may correspond to the front legs 112A, the armrests 150B may correspond to the armrests 150A, and so on. In addition, as described in further detail below, components of the chair 100 extending from the left side to the right side of the chair 100, such as the seat frame 131 and the back frame 141, may also have a symmetrical configuration. For example, the seat frame 131 may include a first seat attachment rail on the left and a second seat attachment rail on the right, the back frame 141 may include a first back attachment rail on the left and a second back attachment rail on the right, and so on.

Chair leg

The portable chair 100 may include two front legs 112A and 112B and two rear legs 122A and 122B. The two front legs 112A and 112B and the two rear legs 122A and 122B may be cylindrical rods, tubes, and/or shafts and may be made of, for example, aluminum, titanium, stainless steel, scandium, metal alloys, polymers, composites, carbon fiber, and/or wood such as bamboo. In the case where the two front legs 112A and 112B and the two rear legs 122A and 122B are made of aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the metal may be hydroformed and vacuum cast and may be treated by anodizing, plating, painting, powder coating, and/or glazing to prevent corrosion caused by environmental conditions such as salt spray. Additionally, the metals and alloys used to fabricate the legs 112A, 112B, 122A, and 122B may be processed by annealing, case hardening, precipitation strengthening, tempering, normalizing, and/or quenching to increase hardness, toughness, and tensile and shear strength.

The front legs 112A and 112B of the portable chair 100 may be connected by a front crossbar 114. The front crossbar 114 may be made of the same material as the front legs 112A and 112B (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo), or may be made of a different material than the front legs 112A and 112B. In the case where the front legs 112A and 112B are made of metal and the front crossbar 114 is also made of metal, the front crossbar 114 may be welded to the inside of the front legs 112A and 112B. Alternatively, the front legs 112A and 112B and the front crossbar 114 may be made as a single continuous piece in a molding operation. In such cases, the manufacturing may be accomplished by hydroforming. Similarly, where the front legs 112A and 112B are made of carbon fiber and the front crossbar 114 is also made of carbon fiber, the front legs 112A and 112B and the front crossbar 114 may be made as a single continuous piece in a molding operation. However, it is also contemplated that the front crossbar 114 may be threaded, bolted, clamped, or otherwise fastened to the interior of the front legs 112A and 112B, for example, where the front legs 112A and 112B are made of a different material than the front crossbar 114. The front rail 114 may be a low deflection and low creep member and may be capable of carrying an applied load of up to 500 pounds. Although not shown in fig. 1, in some cases, the rear legs 120A and 120B of the portable chair 100 may be connected by a rear crossbar similar to the arrangement described above with respect to the front legs 110A and 110B and the front crossbar 114.

In some embodiments, a combination of different materials may be used to form the chair 100. For example, the front legs 110A and 110B and the front crossbar 114 may be made of a different material than the rear legs 120A and 120B. For example, the front legs 110A and 110B and the front crossbar 114 may be made of carbon fiber, and the rear legs 120A and 120B may be made of metal. Alternatively, the front legs 110A and 110B and the rear legs 120A and 120B may be made of a first material (e.g., metal) and the front crossbar 114 may be made of a second material (e.g., carbon fiber).

In arrangements including a rear crossbar, similar combinations of different materials as described above may be used to form the chair 100. For example, the front legs 110A and 110B and the front crossbar 114 may be made of a different material than the rear legs 120A and 120B and the rear crossbar. For example, the front legs 110A and 110B and the front crossbar 114 may be made of carbon fiber, and the rear legs 120A and 120B and the rear crossbar may be made of metal. Alternatively, the front legs 110A and 110B and the rear legs 120A and 120B may be made of a first material (e.g., metal), and the front crossbar 114 and the rear crossbar may be made of a second material (e.g., carbon fiber).

Skid and support leg

The two front legs 112A and 112B may be joined by a front sled 110, which may be a continuous connecting member. Accordingly, the two front legs 112A and 112B and the front sled 110 may be made as a single continuous piece by, for example, any of the manufacturing methods described herein. Similarly, the two rear legs 122A and 122B may be connected by the rear sled 120 and may be made as a single continuous piece. Front skid 110 and rear skid 120 may be treated by anodizing, plating, painting, powder coating, and/or glazing to prevent corrosion from environmental conditions such as salt fog, and by annealing, case hardening, precipitation strengthening, tempering, normalizing, and/or quenching to increase hardness, toughness, and tensile and shear strength.

Additionally, front skid 110 may include front legs 111A and 111B, which may be a lowermost and/or bottommost plastic and/or rubber cover of skid 110 to facilitate or improve frictional engagement with an adjacent contact surface (e.g., floor, ground, etc.). The front leg may include a suitable material or texture to increase the coefficient of friction between the front leg and the surface on which the chair is placed. As shown in fig. 2A, 2B, and 2C, the front legs 111A and 111B can be configured to engage a portion of the front sled 110 adjacent to the front legs 112A and 112B. Accordingly, the front leg 111A may be configured to engage a portion of the front sled 110 adjacent to the front leg 112A, and the front leg 111B may be configured to engage a portion of the front sled 110 adjacent to the front leg 112B.

As shown in fig. 2C, front leg 111B may include an engagement plug 117B. In some cases, engagement plug 117B may be a plastic, rubber, and/or metal protrusion extending radially from front leg 111B. Additionally and/or alternatively, the engagement plug 117B may be a screw-like structure made of plastic, rubber, and/or metal. The engagement plug 117B may be configured to be inserted into the front sled 110. Before, during, or after insertion, an adhesive and/or structural adhesive may be applied to the engagement plug 117B to secure the front leg 111B to the front sled 110. Additionally, the front leg 111B may include a retention feature hole 115B, and the retention feature hole 115B may be configured to allow water to drain from the leg/skid interface. Similar to the front leg 111B, the front leg 111A can include an engagement plug 117A and a retention feature hole 115A, each of which engagement plug 117A and retention feature hole 115A can be configured to interface with the sled 110 and function in the manner described with respect to the front leg 111B.

Additionally, the splice plugs 117A, 117B may each include a series of holes 123 that provide a channel for moisture located in the frame. The series of holes 123 in combination with the retention feature holes 115A, 115B form an outlet that collects all of the moisture inside the chair frame. In one example, a single hole or a plurality of holes may be included at the ends of the engagement plugs 117A, 117B. In other examples, the engagement plugs 117A, 117B may be formed of a porous material that allows water to flow through the engagement plugs 117A, 117B to allow water to escape through the retention feature holes 115A, 115B. It is also contemplated that separate apertures may be included in the frame and front legs 111A, 111B to allow water or moisture to escape from the frame of the chair.

In other examples, the front legs 111A and 111B may be a plastic and/or rubber coating applied to the front sled 110 and may be included in a notch or cutaway pocket (not shown) adjacent to the two front legs 112A and 112B. Alternatively, a plastic and/or rubber coating may be applied at the lowermost portion and/or the bottommost portion along the length of the front skid 110, and the first front engagement surface and the second front engagement surface may form a continuous front engagement surface. In other examples, the plastic and/or rubber coating may be intermittently applied at even intervals at the lowermost and/or bottom-most portions along the length of the front sled 110. In such examples, the front leg may form an uninterrupted front engagement surface.

Similar to the front skid 110, the rear skid 120 may include a rear foot 121A and a rear foot 121B, which may be a lowermost and/or bottommost plastic and/or rubber cover to facilitate frictional engagement with an adjacent contact surface (e.g., floor, ground, etc.). The rear legs 121A and 121B may be configured to engage a portion of the rear sled 120 adjacent the rear legs 122A and 122B. Accordingly, the rear foot 121A can be configured to engage a portion of the rear sled 120 adjacent the rear leg 122A, and the rear foot 121B can be configured to engage a portion of the rear sled 120 adjacent the rear leg 122B.

Similar to the front legs 111A and 111B, the rear legs 121A and 121B may each include an engagement plug and a retention feature hole. The engagement plugs and retention feature holes of the rear legs 121A and 121B can be configured to interface with the sled 120 and function in the manner described with respect to the front legs 111A and 111B. The rear legs 121A and 121B may also have similar drainage features as described above with respect to the front legs 111A and 111B.

Likewise, in other examples, the rear legs 121A and 121B may be a plastic and/or rubber coating applied to the rear sled 120 and may be included in a pocket adjacent to the two rear legs 122A and 122B. Alternatively, a plastic and/or rubber coating may be applied at the lowermost and/or bottom-most portions along the length of the rear skid 120, and the first and second rear engagement surfaces may form a continuous rear engagement surface. In other examples, the plastic and/or rubber coating may be intermittently applied at even intervals at the lowermost and/or bottom-most portions along the length of the rear skid 120. In such examples, the first and second rear engagement surfaces may form an uninterrupted rear engagement surface.

Joinery interface

As shown in fig. 3, at the upper and/or top proximal end, the front leg 112A may intersect with the front leg joinery interface 116A. Specifically, the front leg joinery interface 116A may include a tubular end into which the front leg 112A may be configured to be inserted. Prior to, during, or after insertion, an adhesive and/or structural adhesive may be applied to the tubular end of the front leg joinery interface 116A and/or the upper/top proximal end of the front leg 112A to secure the front leg 112A to the front leg joinery interface 116A. Such adhesives may include dry adhesives, pressure sensitive adhesives, contact adhesives, thermal adhesives, reactive adhesives, multi-component adhesives, single component adhesives. The adhesive may be natural or synthetic, and may be based on one or more of thermoplastics, emulsions, or thermosets, including one or more of epoxy, polyurethane, cyanoacrylate, or acrylic polymers. Additionally and/or alternatively, the front leg 112A can be welded to the front leg joinery interface 116A.

The front leg 112B may be configured to engage (e.g., adhere and/or weld) with the front leg joinery interface 116B in the manner described with respect to the front leg 112A and the front leg joinery interface 116A.

Similarly, at the upper and/or top proximal end, the rear leg 122A may intersect with the rear leg joinery interface 126A. Specifically, the rear leg joinery interface 126A may include a tubular end into which the rear leg 122A may be configured to be inserted. Prior to, during, or after insertion, the adhesive and/or structural adhesive described herein may be applied to the tubular end of the rear leg joinery interface 126A and/or the upper/top proximal end of the rear leg 122A to secure the rear leg 122A to the rear leg joinery interface 126A. Additionally and/or alternatively, the rear leg 122A may be welded to the rear leg joinery interface 126A. The rear leg 122B may be configured to engage (e.g., adhere and/or weld) with the rear leg joiner interface 126B in the manner described with respect to the rear leg 122A and the rear leg joiner interface 126A. However, it is also contemplated that the joints described herein may be formed by mechanical fastening techniques such as friction fit, threads, ball and socket, bayonet connection, and the like.

In some arrangements, at the upper and/or top proximal end of the front leg 112A, the front leg 112A may curve in a rearward direction to an obtuse angle and terminate at the front leg joinery interface 116A. In some cases, the front leg joinery interface 116A may be at a continuous upper and/or top end portion of the front leg 110A and may be made of the same material (e.g., aluminum, titanium, scandium, a metal alloy, carbon fiber, and/or bamboo) as the front leg 112A.

The rear leg 122A may extend linearly to the upper and/or top proximal end and may terminate at a rear leg joinery interface 126A. The rear leg joinery interface 126A may be a continuous upper and/or top end portion of the rear leg 122A and may be made of the same material (e.g., aluminum, titanium, scandium, metal alloys, carbon fiber, and/or bamboo) as the rear leg 122A.

The front leg joinery interface 116A, 116B may be configured to engage, interface, and/or otherwise connect with the rear leg joinery interface 126A, 126B. In one example, the front joinery interface 116A, 116B and the rear joinery interface 126A, 126B are configured to pivot about pins 128A, 128B such that the front legs 112A, 112B are configured to pivot relative to the rear legs 122A, 122B.

Seat and seat frame

The portable chair 100 may include a seat 130, the seat 130 being removably attached to a seat frame 131. The front legs 112A and 112B may be configured to rotatably engage and/or secure to the front leg attachment portions 170A and 170B of the seat frame 131 via pins 171A and 171B, respectively.

The seat frame 131 may be a cylindrical rod, tube, shaft and/or extruded I-beam, and may also be made of aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber and/or bamboo. Thus, in the case of making the seat frame 131 from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast and may be treated by anodizing, plating, painting, powder coating, and/or glazing to prevent corrosion from environmental conditions such as salt spray. In addition, the metal used to manufacture the seat frame 131 may be annealed, case hardened, precipitation strengthened, tempered, normalized and/or quenched to increase hardness, toughness, and tensile and shear strength.

The seat frame 131 can include front leg attachment portions 170A and 170B, which front leg attachment portions 170A and 170B can be configured to facilitate rotatable attachment of the seat frame 131 to the front legs 112A and 112B via pins 171A and 171B, respectively. Additionally, the seat frame 131 may intersect the seat joinery interfaces 133A and 133B. Specifically, seat joinery interfaces 133A and 133B may include tubular ends into which seat frame 131 may be configured to be inserted. Prior to, during, or after insertion, the adhesives and/or structural adhesives described herein may be applied to the tubular ends of the seat joinery interfaces 133A and 133B and/or the ends of the seat frame 131 to secure the seat frame 131 to the seat joinery interfaces 133A and 133B.

As shown in fig. 4B, 5A, 7A, and 7B, the seat frame 131 can include a carrying handle 172. The carrying handle 172 can be a front overmolded fastener extending from the inner surface of the seat frame 131. The handles 172 may be twice as large as easily held handles used to carry the chair 100. The carrying handle 172 may be positioned on an inner surface of the front portion of the seat frame 131 and may be made of the same material as the seat frame 131 (e.g., aluminum, titanium, stainless steel, scandium, metal alloy, carbon fiber, and/or bamboo). Accordingly, the carrying handle 172 can be made as a continuous piece of the seat frame 131. Thus, where the seat frame 131 and carrying handle 172 are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the seat frame 131 and carrying handle 172 and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent corrosion caused by environmental conditions such as salt spray. Additionally, the metal used to manufacture the seat frame 131 and the carrying handle 172 may be annealed, case hardened, precipitation strengthened, tempered, normalized and/or quenched to increase hardness, toughness, and tensile and shear strength.

Alternatively, the carrying handle 172 may not form a continuous piece with the seat frame 131, and accordingly may be a separate component. In such cases, the carrying handle 172 may be made of the same material as the seat frame 131, or may be made of a different material. In either case, the carrying handle 172 can be attached to the seat frame 131 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

First embodiment of seat/seat frame Joint

In accordance with the first embodiment of the seat/seat frame joint and as shown in fig. 4B, the carrying handle 172 can include a front attachment hole 177B on a first side of the carrying handle 172 (e.g., a left side of the carrying handle 172), a front attachment hole 177A on a second side of the carrying handle 172 (e.g., a right side of the carrying handle 172), and a front attachment hole 177 on a third side of the carrying handle 172 (e.g., a center of the carrying handle 172). As described in further detail below, the front attachment holes 177, 177A, and 177B can be configured to engage with front attachment clips 187, 187A, and 187B, respectively, of the seat 130.

In addition, seat frame 131 can also include seat attachment rails 172B. The seat attachment rails 172B may be positioned on an inner surface of the sides of the seat frame 131 adjacent the armrests 150B, the front legs 112B, and the like. The seat attachment rails 172B may be made of the same material as the seat frame 131 (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo). Accordingly, seat attachment rails 172B can be made as a continuous piece of seat frame 131. Thus, where the seat frame 131 and seat attachment rails 172B are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the seat frame 131 and seat attachment rails 172B and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent environmental conditions such as salt spray induced corrosion. Additionally, the metal used to make the seat frame 131 and seat attachment rails 172B may be annealed, case hardened, precipitation strengthened, tempered, normalized, and/or quenched to increase hardness, toughness, and tensile and shear strength.

Alternatively, the seat attachment rails 172B may not form a continuous piece with the seat frame 131, and accordingly may be a separate component. In such cases, seat attachment rails 172B may be made of the same material as seat frame 131, or may be made of a different material. In either case, the seat attachment rails 172B may be attached to the seat frame 131 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

The seat attachment rail 172B can include a rib engagement groove and a plurality of side attachment holes. For example, as shown in fig. 4B, seat attachment rail 172B can include rib engagement groove 175B and side attachment hole 174B. Rib-engaging groove 175B can extend along the entire length of seat attachment rail 172B. Rib-engaging groove 175B may be configured to support side ribs 185B and flange 191B of seat 130. A plurality of side attachment holes 174B may be positioned on the rib engagement groove 175B. Each of the side attachment holes 174B may be configured to receive a side attachment screw interface 184B of the seat 130. Although five side attachment holes 174B are shown in fig. 4B, a fewer number (e.g., one, two, three, or four) or a greater number (six, ten, etc.) of side attachment holes 174B may be included.

Seat frame 131 can also include seat attachment rails 172A. The seat attachment rails 172A can be positioned on an inner surface of the sides of the seat frame 131 adjacent the armrests 150A, the front legs 112A, and the like. The seat attachment rails 172A may be made of the same material as the seat frame 131 (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo). Accordingly, seat attachment rail 172A can be made as a continuous piece of seat frame 131. Thus, where the seat frame 131 and seat attachment rails 172A are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the seat frame 131 and seat attachment rails 172A, and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent environmental conditions such as salt spray induced corrosion. Additionally, the metal used to make the seat frame 131 and seat attachment rails 172A may be annealed, case hardened, precipitation strengthened, tempered, normalized, and/or quenched to increase hardness, toughness, and tensile and shear strength.

Alternatively, the seat attachment rails 172A may not form a continuous piece with the seat frame 131, and accordingly may be a separate component. In such cases, seat attachment rails 172A may be made of the same material as seat frame 131, or may be made of a different material. In either case, the seat attachment rails 172A can be attached to the seat frame 131 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

The seat attachment rail 172A can include a rib engagement groove and a plurality of side attachment holes. For example, as shown in fig. 4B, seat attachment rail 172A can include rib engagement groove 175A and side attachment hole 174A. Rib engagement groove 175A can extend along the entire length of seat attachment rail 172A. Rib-engaging groove 175A may be configured to support side ribs 185A and flange 191A of seat 130. A plurality of side attachment holes 174A may be positioned on the rib engagement groove 175A. Each of the side attachment holes 174A may be configured to receive a side attachment screw interface 184A of the seat 130. Although five side attachment holes 174A are shown in fig. 4B, a fewer number (e.g., one, two, three, or four) or a greater number (six, ten, etc.) of side attachment holes 174A may be included.

Referring to fig. 4A, seat 130 may be constructed from any of a number of materials, including but not limited to: protective fabric cloth, sail fabric, awning fabric, Kevlar, sail, vinyl coated polyester, nylon mesh, neoprene, aluminized nylon, and/or cotton canvas. In some embodiments, the material may be treated to provide enhanced uv stability and weatherability, fire resistance, abrasion and tear resistance, and water resistance.

The material used to make the seat 130 can be made in a highly permeable woven and/or mesh construction and can thereby provide greater load bearing capacity and user comfort. The perimeter of the seat 130, which may be of woven and/or mesh fabric construction, may interface with a seat frame boundary 183, which seat frame boundary 183 may be a rigid thermoplastic overmold. In forming the interface between seat 130 and seat frame boundary 183, seat frame boundary 183 may be overmolded onto seat 130 by a partial injection molding process. This method may form thermoplastic features (e.g., seat frame boundary 183 and components included therein) by a woven fabric along the perimeter of seat 130. Upon completion of the partial injection molding process, the woven and/or mesh fabric construction of the seat 130 may be tensioned and the seat frame boundary 183 may be rigidly attached to the seat 130. Such attachment methods can eliminate stitches in the seat fabric and are extended to provide advantages of repeatability, durability, dimensional accuracy, frame attachment flexibility, and improved aesthetics.

The seat frame boundary 183 may include a plurality of protrusions of various types configured to facilitate and/or promote engagement between the seat 130 and the seat frame 131. Specifically, seat frame boundary 183 can include front attachment clamps 187, 187A, and 187B, seat frame corner engagement surfaces 189A and 189B, side attachment screw interfaces 184A and 184B, side ribs 185A and 185B, flanges 191A and 191B, and rear crossbar recess 196.

The seat 130 may be configured to be removably attached and/or joined to the seat frame 131. In forming the removable attachment and/or engagement, the various projections of seat frame boundary 183 of seat 130 may be configured to removably connect and/or interface to particular aspects of front handle 172 and seat attachment rails 172A and 172B. For example, front attachment clamps 187, 187A, and 187B and side attachment screw interfaces 184A and 184B of seat frame perimeter 183 can be configured to removably connect, insert, and/or interface to front attachment holes 177, 177A, and 177B of carrying handle 172 and side attachment holes 174A and 174B of seat attachment rails 172A and 172B, respectively. Additionally, seat frame corner engagement surfaces 189A and 189B of seat 130 and rear crossbar recess 196 of seat frame perimeter 183 may be configured to removably interface with seat frame corners 179A and 179B and rear crossbar 197, respectively, of seat frame 131.

In addition, side ribs 185A and 185B and flanges 191A and 191B of seat frame boundary 183 of seat 130 can be configured to removably interface with rib-engaging grooves 175A and 175B of seat attachment rails 172A and 172B. The side ribs 185A, 185B can be load-bearing ribs and can be configured to interface with the rib-engaging grooves 175A, 175B of the seat attachment rails 172A, 172B. Side ribs 185A, 185B may extend from the bottom surface of the right and left sides of the seat frame boundary 183, and flanges 191A, 191B may be located on each side of the seat frame boundary 183. The series of flanges 191A, 191B can extend perpendicular to the bottom surface of seat frame boundary 183 and the outer surfaces of side ribs 175A, 175B. The side ribs 185A, 185B and the series of flanges 191A, 191B prevent the side ribs from twisting when the seat is loaded. Accordingly, the side ribs 185A, 185B and flanges 191A, 191B may relieve the structural load of the side attachment screw interfaces 184A, 184B when the seat 130 and seat frame 131 are in an attached or detached state, and may also provide a complementary force to the force provided by the side attachment screw interfaces 184A, 184B in the state where the seat 130 is attached to the seat frame 131. In the attached state, the side ribs 185A, 185B can traverse along the length of the seat attachment rails 172A, 172B, and the flanges 191A, 191B can traverse the horizontal regions of the seat attachment rails 172A, 172B. The number of flanges 191A, 191B may be selected based on the desired threshold load for the chair, the thickness of each flange, and the weight distribution of the chair.

Referring in more detail to fig. 4C and 4D, side attachment screw interface 184B may be configured to be inserted through side attachment hole 174B during removable attachment between seat 130 and seat frame 131. Side attachment screw interface 184B may be configured to receive screw 194B in order to secure seat 130 to seat frame 131. For example, side attachment screw interface 184B may be inserted through side attachment hole 174B. Screw cover plate 195B is removable from side rail 172B to expose side attachment screw interface 184B. After removing the screw cover plate 195B, a screw 194B is rotatably inserted into the side attachment screw interface 184B. Similarly, a screw 194B is rotatably inserted into each of the side attachment screw interfaces 184B. After each of the screws 194B is inserted into the side attachment screw interface 184B, the screw cover plate 195B may be reattached to the side attachment rail 172B. Similar processing may be performed for side attachment screw interface 184A, side attachment hole 178A, screw cover plate 195A, and screw 195A.

In the manner described above, the seat 130, via the seat frame boundary 183 and the plurality of projections formed thereon, can be configured to engage the side attachment rails 172A and 172B of the seat frame 131 and the carrying handle 172. In some cases, the seat frame perimeter 183 can be secured to the seat frame 131 by positioning a first end (e.g., front portion) of the seat frame perimeter 183 in a first end (e.g., front portion) of the seat frame 131, and rolling and/or flexing the seat frame perimeter 183 from the first end of the seat frame 131 to a second end (e.g., rear portion) of the seat frame 131. Rolling and/or flexing the seat frame boundary 183 from the first end to the second end of the seat frame 131 can align the plurality of protrusions of the seat frame boundary 183 with the plurality of slots in the back attachment rail and removably attach the seat frame boundary 183 on the back frame 131.

Alternatively, the seat frame boundary 183 may be secured to the seat frame 131 by inserting the rearmost attachment screw interface 184B of the left side of the seat frame boundary 183 into the rearmost attachment hole 174B of the left side attachment rail 172B and inserting the rearmost attachment screw interface 184A of the right side of the seat frame boundary 183 into the rearmost attachment hole 174A of the right side attachment rail 172A. Next, the first, second, and third medial attachment screw interfaces 184B of the left side of the seat frame boundary 183 can be inserted into the first, second, and third medial attachment holes 174B of the left attachment rail 172B. Similarly, first, second, and third medial attachment screw interfaces 184A on the right side of seat frame boundary 183 can be inserted into first, second, and third medial attachment holes 174A of right attachment rail 172A. Subsequently, the front-most attachment screw interface 184B of the left side of the seat frame boundary 183 can be inserted into the front-most attachment hole 174B of the left attachment rail 172B, and the front-most attachment screw interface 184A of the right side of the seat frame boundary 183 can be inserted into the front-most attachment hole 174A of the right attachment rail 172A. The seat 130 can then be rolled and/or flexed in a downward direction at the front of the seat 130 via the seat frame boundary 183 to align and insert the front attachment clamps 187, 187A, and 187B of the seat frame boundary 183 with the front attachment holes 177, 177A, and 177B of the carrying handle 172, and to align and insert the front attachment clamps to the right of the seat frame boundary 183 with the front attachment holes of the right end portion of the carrying handle 172. Next, the screw cover plates 195A and 195B may be removed from the side attachment rails 172A and 172B, and each of the screws 194A and 194B may be screwed into the respective side attachment screw interfaces 184A and 184B. After insertion, the screw cover plates 195A and 195B may be reattached to the side attachment rails 172A and 172B.

During assembly of seat frame boundary 183 with seat frame 131, seat frame boundary 183 may roll from the rear end to the front end. Although such steps are described in a particular order from back to front, the steps need not be performed in such order, but rather may be performed in any particular order.

Further, with the seat 130 attached to the seat frame 131, as shown in fig. 4C, the seat frame boundary 183 may interface with the exterior of the seat frame 131. In some cases, after the injection molding process described above, the seat frame boundary 183 may be machined for finishing control of the seat frame boundary-seat frame interface.

Second embodiment of seat/seat frame Joint

According to a second embodiment of the seat/seat frame joint and as shown in fig. 5A, the carry handle 172 may include a front attachment hole 177B and a side opening 178B on a first side of the carry handle 172 (e.g., a left side of the carry handle 172), a front attachment hole 177A and a side opening 178A on a second side of the carry handle 172 (e.g., a right side of the carry handle 172), and a front attachment hole 177 on a third side of the carry handle 172 (e.g., a center of the carry handle 172). As described in further detail below, the front attachment hole 177B and the side opening 178B can be configured to engage with a front attachment clamp 187B and a carrying handle side cover 188B, respectively, of the seat 130, as shown in fig. 5B. As described above, the components of the chair 100 (e.g., the carrying handle 172) extending from the left side to the right side of the chair 100 may have a symmetrical configuration. Thus, the carry handle 172 may further include a front seat attachment hole and a side opening on a second side of the carry handle 172 (e.g., a right side of the carry handle 172) that are oriented and configured similarly to the front seat attachment hole 177B and the side opening 178B.

Referring to fig. 5A, seat frame 131 can also include seat attachment rails 172B. The seat attachment rails 172B may be positioned on an inner surface of the sides of the seat frame 131 adjacent the armrests 150B, the front legs 112B, and the like. The seat attachment rails 172B may be made of the same material as the seat frame 131 (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo). Accordingly, seat attachment rails 172B can be made as a continuous piece of seat frame 131. Thus, where the seat frame 131 and seat attachment rails 172B are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the seat frame 131 and seat attachment rails 172B and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent environmental conditions such as salt spray induced corrosion. Additionally, the metal used to make the seat frame 131 and seat attachment rails 172B may be annealed, case hardened, precipitation strengthened, tempered, normalized, and/or quenched to increase hardness, toughness, and tensile and shear strength.

Alternatively, the seat attachment rails 172B may not form a continuous piece with the seat frame 131, and accordingly may be a separate component. In such cases, seat attachment rails 172B may be made of the same material as seat frame 131, or may be made of a different material. In either case, the seat attachment rails 172B may be attached to the seat frame 131 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

The seat attachment rail 172B can include a side opening, a rib engagement groove, and a plurality of side attachment holes. For example, as shown in fig. 5A, seat attachment rail 172B can include side openings 176B (e.g., distal and proximal openings), rib-engaging groove 175B, and side attachment holes 174B. Side openings 176B may provide openings through which the inside and/or interior of seat attachment rails 172B may be accessed. The side opening 176B may be configured to be covered by a seat attachment rail side cover 186B of the seat 130. The rail side covers 186 may be provided with integral ribs 192 to provide additional support to the seat frame boundaries. Rib engagement groove 175B may extend along the entire length of seat attachment rail 172B from a first side opening 176B (e.g., the distal opening furthest from backrest 140) to a second side opening 176B (e.g., the proximal opening closest to backrest 140) along a plane parallel to seat frame 131, wherein seat attachment rail 172B is attached to the surface of seat frame 131. The rib-engaging groove 175B can be configured to support the side ribs 185B of the seat 130. A plurality of side attachment holes 174B may be positioned on the rib engagement groove 175B. Each of the side attachment holes 174B may be configured to receive a side attachment clip 184B of the seat 130. Although four side attachment holes 174B are shown in fig. 4B, a fewer number (e.g., one, two, or three) or a greater number (five, six, ten, etc.) of side attachment holes 174B may be included. The seat frame 131 can further include additional seat attachment rails positioned on the inner surface of the opposite side portions of the seat frame 131 opposite the seat attachment rails 172B. The additional seat attachment rails may be similar to seat attachment rails 172B.

Referring to fig. 5B, seat frame boundary 183 may include a plurality of protrusions of various types configured to facilitate and/or promote engagement between seat 130 and seat frame 131. Specifically, seat frame boundary 183 may include front attachment clamp 187B, carrying handle side covers 188B, seat frame corner engagement surfaces 189B, seat attachment rail side covers 186B, side attachment clamps 184B, and side ribs 185B. Each of such protrusions may be positioned on the left side of the seat 130 in a state where the seat 130 is engaged with the seat frame 131, and may be adjacent to the front legs 112B, the armrests 150B, and the like. Further, the seat 130 may additionally include front attachment clamps, carry handle side covers, seat frame corner engagement surfaces, seat attachment rail side covers, side attachment clamps, and side ribs on the right side of the seat 130. Such projections may be similar to those on the left side of the seat 130 (e.g., front attachment clips 187B, carrying handle side covers 188B, seat frame corner engagement surfaces 189B, etc.), but in a mirror-image orientation on the right side of the seat 130. Accordingly, with the seat 130 engaged with the seat frame 131, such protrusions on the right side of the seat 130 may be adjacent the front legs 112A, the armrests 150A, and so forth.

The seat 130 may be configured to be removably attached and/or joined to the seat frame 131. In forming the removable attachment and/or engagement, the various projections of seat frame boundary 183 of seat 130 can be configured to removably connect and/or interface to particular aspects of front handle 172 and seat attachment rail 172B. For example, the front and side attachment clamps 187B, 184B of the seat frame perimeter 183 can be configured to removably connect and/or interface with the front attachment holes 177B of the carrier handle 172 and the side attachment holes 174B of the seat attachment rail 172B of the seat frame 131, respectively. Further, the carry handle side covers 188B and seat attachment rail side covers 186B of the seat frame boundaries 183 of the seat 130 may be configured to removably interface with the interface side openings 178B of the carry handle 172 and the side openings 176B of the seat attachment rails 172B of the seat frame 131, respectively. Additionally, seat frame corner engagement surfaces 189B and side ribs 185B of seat frame boundary 183 of seat 130 can be configured to removably interface with seat frame corners 179B of seat frame 131 and rib engagement grooves 175B of seat attachment rails 172B, respectively. The aforementioned connections and/or interfaces may occur on the left side of the chair 100. Such connections and/or interfaces may be adjacent to the front legs 112B, the armrests 150B, etc., in a state where the seat 130 is removably attached and/or engaged to the seat frame 131.

Similarly, the front attachment clamps, the carry handle side covers, the seat frame corner engagement surfaces, the seat attachment rail side covers, the side attachment clamps, and the side ribs to the right of the seat frame boundary 183 of the seat 130 can be configured to removably connect and/or interface the front seat attachment hole and the side openings of the right side of the carry handle 172, the seat frame corners of the right side of the seat frame 131, and the side openings, rib engagement grooves, and the plurality of side attachment holes of the seat attachment rails of the right side of the seat frame 131 in the manner described above.

Referring in more detail to fig. 5D, side attachment clamp 184B may be configured to be inserted through side attachment hole 174B during removable attachment between seat 130 and seat frame 131. Side attachment clamp 184B may have an extended rectangular configuration with a semi-arrowhead shaped distal end providing rotational flexibility during insertion and removal and vertical force distribution during engagement. For example, during insertion into side attachment hole 174B, a rotational force may be applied to the outer surface of the half-arrow tip of side attachment clamp 184B. In response to the rotational force, the side attachment jig 184B may be configured to be rotatably displaced and to insert the side attachment jig 184B into the side attachment hole 174B. Upon completion of insertion and removal of the rotational force, side attachment clamp 184B may be configured to return to the resting position, and the upper surface and/or overhanging surface of the half-arrow portion of side attachment clamp 184B may be configured to interface with the bottommost surface of rib-engaging groove 175B of seat attachment rail 172B. Such an interface provided by the side attachment clamp 184B, in combination with the other side and front attachment clamps, may provide for removable attachment of the seat 130 to the seat 131.

The side ribs 185A, 185B can be load-bearing ribs and can be configured to interface with the rib-engaging grooves 175A, 175B of the seat attachment rails 172A, 172B. Side ribs 185A, 185B may extend from the bottom surface of the right and left sides of the seat frame boundary 183, and a series of flanges 191 may be located on each side of the seat frame boundary 183. The series of flanges 191 can extend perpendicular to the bottom surface of the seat frame boundary 183. The series of flanges 191 and the bottom surface of the seat frame boundary 183 prevent the side ribs from twisting when the seat is loaded. Accordingly, the side ribs 185A, 185B and the flange 191 can relieve the side attachment clamps 184A, 184B and other side attachment clamps from structural loads during use when the seat 130 and the seat frame 131 are in an attached or detached state, and can also provide a complementary force to the force provided by the side attachment clamps 184A, 184B in the state where the seat 130 is attached to the seat frame 131. The number of side ribs 185 may be selected based on the desired threshold load for the chair, the thickness of each side of each rib, and the weight distribution of the chair. Additionally, it is also contemplated that the side ribs may be formed by integrally extending ribs that extend along the length of the grooves of the attachment rails 175A, 175B.

In the manner described above, the seat 130, via the seat frame boundary 183 and the plurality of projections formed thereon, may be configured to engage with the side attachment rails of the seat frame 131 and the carrying handle 172. Specifically, the seat frame perimeter 183 may be secured to the seat frame 131 by positioning a first end (e.g., front portion) of the seat frame perimeter 183 in a first end (e.g., front portion) of the seat frame 131, and rolling and/or flexing the seat frame perimeter 183 from the first end of the seat frame 131 to a second end (e.g., rear portion) of the seat frame 131. Rolling and/or flexing the seat frame boundary 183 from the first end to the second end of the seat frame 131 can align the plurality of protrusions of the seat frame boundary 183 with the plurality of slots in the back attachment rail and removably attach the seat frame boundary 183 on the back frame 131.

Alternatively, the seat frame boundary 183 may be secured to the seat frame 131 by inserting the rearmost attachment clip 186B of the left side of the seat frame boundary 183 into the rearmost attachment hole 176B of the left side attachment rail 172B and inserting the rearmost attachment clip of the right side of the seat frame boundary 183 into the rearmost attachment hole of the right side attachment rail. Next, the first and second mid-side attachment clips 186B, 186B of the left side of the seat frame boundary 183 can be inserted into the first and second mid-side attachment holes 176B, 176B of the left side attachment rail 172B, and the first and second mid-side attachment clips of the right side of the seat frame boundary 183 can be inserted into the first and second mid-side attachment holes of the right side attachment rail. Subsequently, the front-most attachment clip 186B of the left side of the seat frame boundary 183 can be inserted into the front-most attachment hole 176B of the left attachment rail 176B, and the front-most attachment clip of the right side of the seat frame boundary 183 can be inserted into the front-most attachment hole of the right attachment rail. The seat 130 can then be rolled and/or flexed in a downward direction at the front of the seat 130 via the seat frame boundary 183 to align the front attachment clamp 187B on the left side of the seat frame boundary 183 with the front attachment hole 177B of the left end portion of the carry handle 172 and to align the front attachment clamp on the right side of the seat frame boundary 183 with the front attachment hole of the right end portion of the carry handle 183. Next, the front attachment clamp 187B on the left side of the seat frame boundary 183 may be inserted into the front attachment hole 177B of the left end portion of the carrier handle 172, and the front attachment clamp on the right side of the seat frame boundary 183 may be inserted into the front attachment hole of the right end portion of the carrier handle 172.

During assembly of seat frame boundary 183 with seat frame 131, seat frame boundary 183 may roll from the rear end to the front end. Although such steps are described in a particular order from back to front, the steps need not be performed in such order, but rather may be performed in any particular order.

Backrest and backrest frame

In combination with the seat 130, the portable chair 100 may include a backrest 140, the backrest 140 being removably attached to a backrest frame 141. The back frame 141 may be a cylindrical rod, tube, shaft and/or extruded I-beam, and may also be made of aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber and/or bamboo. Thus, in the case of making the back frame 141 from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast and may be treated by anodizing, plating, painting, powder coating, and/or glazing to prevent corrosion from environmental conditions such as salt spray. In addition, the metal used to manufacture the back frame 141 may be treated by annealing, case hardening, precipitation strengthening, tempering, normalizing, and/or quenching to increase hardness, toughness, and tensile and shear strength.

The back frame 141 can include an armrest attachment portion that can be configured to facilitate rotatable attachment of the back frame 141 to the armrests 150A and 150B via a pin, including pin 157B. Additionally, the back frame 141 may intersect the back joinery interfaces 143A and 143B. In particular, the back joinery interfaces 143A and 143B may include tubular ends into which the back frame 141 may be configured to be inserted. Prior to, during, or after insertion, an adhesive and/or structural adhesive may be applied to the tubular ends of the back joinery interfaces 143A and 143B and/or the ends of the back frame 141 to secure the back frame 141 to the back joinery interfaces 143A and 143B.

In a manner similar to that described above with respect to the seat frame 131, the back frame 141 can include a carrying handle and one or more back attachment rails. For example, as shown in fig. 6B, the carrying handle 272 can include a top attachment hole 277B on a first side of the carrying handle 272 (e.g., a left side of the carrying handle 272), a top attachment hole 277A on a second side of the carrying handle 272 (e.g., a right side of the carrying handle 172), and a top attachment hole 277 on a third side of the carrying handle 272 (e.g., a center of the carrying handle 272). As described in further detail below, the top attachment holes 277, 277A, 277B may be configured to engage with top attachment clamps 287, 287A, 287B of the backrest 140, respectively.

In addition, the back frame 141 may also include a back attachment rail 272B. The back attachment rail 272B may be positioned on an inner surface of a side of the back frame 141 adjacent to the armrest 150B, the front leg 112B, or the like. The back attachment rail 272B may be made of the same material as the back frame 141 (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo). Accordingly, the back attachment rail 272B may be made as a continuous piece of the back frame 141. Thus, in the case where the back frame 141 and back attachment rail 272B are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the back frame 141 and back attachment rail 272B and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent corrosion caused by environmental conditions such as salt spray. In addition, the metal used to manufacture the back frame 141 and back attachment rails 272B may be processed by annealing, case hardening, precipitation strengthening, tempering, normalizing, and/or quenching to increase hardness, toughness, and tensile and shear strength.

Alternatively, the back attachment rail 272B may not form a continuous piece with the back frame 141 and accordingly may be a separate component. In such cases, the back attachment rail 272B may be made of the same material as the back frame 141, or may be made of a different material. In either case, the back attachment rail 272B may be attached to the back frame 141 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

The back attachment rail 272B may include a rib engagement groove and a plurality of side attachment holes. For example, as shown in fig. 6B, the back attachment rail 272B may include rib engagement grooves 275B and side attachment holes 274B. The rib engagement groove 275B can extend along the entire length of the back attachment rail 272B. The rib engagement groove 275B may be configured to support the side rib 285B and the flange 291B of the backrest 140. A plurality of side attachment holes 274B may be positioned on the rib engagement groove 275B. Each of the side attachment holes 274B may be configured to receive a side attachment screw interface 284B of the backrest 140. Although five side attachment holes 274B are shown in fig. 6B, a fewer number (e.g., one, two, three, or four) or a greater number (six, ten, etc.) of side attachment holes 274B may be included.

The back frame 141 may also include a back attachment rail 272A. The back attachment rail 272A may be positioned on an inner surface of a side of the back frame 141 adjacent to the armrest 150A, the front leg 112A, or the like. The back attachment rail 272A may be made of the same material as the back frame 141 (e.g., aluminum, titanium, stainless steel, scandium, metal alloys, carbon fiber, and/or bamboo). Accordingly, the back attachment rail 272A may be made as a continuous piece of the back frame 141. Thus, in the case where the back frame 141 and back attachment rail 272A are fabricated from aluminum, titanium, stainless steel, scandium, and/or a metal alloy, the material may be hydroformed and vacuum cast into the back frame 141 and back attachment rail 272A, and may be treated by anodizing, electroplating, painting, powder coating, and/or glazing to prevent corrosion caused by environmental conditions such as salt spray. In addition, the metal used to manufacture the back frame 141 and back attachment rails 272A may be processed by annealing, case hardening, precipitation strengthening, tempering, normalizing, and/or quenching to increase hardness, toughness, and tensile and shear strength.

Alternatively, the back attachment rail 272A may not form a continuous piece with the back frame 141 and accordingly may be a separate component. In such cases, the back attachment rail 272A may be made of the same material as the back frame 141, or may be made of a different material. In either case, the back attachment rail 272A may be attached to the back frame 141 by adhesion, welding, mechanical fastening (e.g., nuts and bolts), and the like.

The back attachment rail 272A can include a rib engagement groove and a plurality of side attachment holes. For example, as shown in fig. 6B, the back attachment rail 272A may include rib engagement grooves 275A and side attachment holes 274A. The rib engagement groove 275A can extend along the entire length of the back attachment rail 272A. The rib engagement groove 275A may be configured to support the side rib 285A and the flange 291A of the backrest 140. A plurality of side attachment holes 274A may be positioned on the rib engagement groove 275A. Each of the side attachment holes 274A may be configured to receive a side attachment screw interface 284A of the backrest 140. Although five side attachment holes 274A are shown in fig. 6B, a fewer number (e.g., one, two, three, or four) or a greater number (six, ten, etc.) of side attachment holes 274A may be included.

Referring to fig. 6A, the backrest 140 may be constructed from any of a number of materials, including but not limited to: protective fabric cloth, sail fabric, awning fabric, Kevlar, sail, vinyl coated polyester, nylon mesh, neoprene, aluminized nylon, and/or cotton canvas. In some embodiments, the material may be treated to provide enhanced uv stability and weatherability, fire resistance, abrasion and tear resistance, and water resistance.

In some cases, the backrest 140 may be constructed of a similar material as the seat 130. However, in some cases, the material used to make the backrest 140 may be different from the material used to make the seat 130. For example, the backrest 140 may be made of a first material and/or combination of materials and the seat 130 may be made of a second material and/or combination of materials that is different than the first material and/or combination of materials.

The material used to make the backrest 140 may be made into a high permeability woven and/or mesh construction and accordingly may provide greater load bearing capacity and user comfort. The perimeter of the woven and/or mesh fabric construction of the back 140 may interface with a back frame boundary 193, and the seat frame boundary 193 may be a rigid thermoplastic overmold. The back frame border 193 may be overmolded onto the back 140 by a partial injection molding process as the interface between the back 140 and the back frame border 193 is formed. The method may form thermoplastic features (e.g., the back frame boundary 193 and components included therein) by weaving the fabric along the perimeter of the back 140. Upon completion of the partial injection molding process, the woven and/or mesh fabric construction of the backrest 140 may be tensioned and the backrest frame boundary 193 may be rigidly attached to the backrest 140. Such attachment methods can eliminate stitches in the seat fabric and are extended to provide advantages of repeatability, durability, dimensional accuracy, frame attachment flexibility, and improved aesthetics.

The back frame boundary 193 can include a plurality of protrusions of various types configured to facilitate and/or promote engagement between the back 140 and the back frame 141. Specifically, the back frame boundary 193 may include top attachment clamps 287, 287A, and 287B, back frame corner engagement surfaces 289A and 289B, side attachment screw interfaces 284A and 284B, side ribs 285A and 285B, and flanges 291A and 291B.

The backrest 140 may be configured to be removably attached and/or joined to the seat frame 141. In forming the removable attachment and/or engagement, the various protrusions of the back frame boundary 193 of the back 140 can be configured to removably connect, insert, and/or interface to particular aspects of the top handle 272 and back attachment rails 272A and 272B. For example, top attachment clamps 287, 287A, and 287B and side attachment screw interfaces 284A and 284B at the back of frame boundary 193 can be configured to removably connect, insert, and/or interface to top attachment holes 277, 277A, and 277B of carrying handle 272 and side attachment holes 274A and 274B of back attachment rails 272A and 272B, respectively. Additionally, the back frame corner engagement surfaces 289A and 289B of the back frame boundary 283 of the back 140 may be configured to removably interface with the back frame corners 279A and 279B, respectively, of the back frame 141.

In addition, the side ribs 285A and 285B and the flanges 291A and 291B of the back frame boundary 193 of the back 140 may be configured to removably interface with the rib-engaging grooves 275A and 275B of the back attachment rails 272A and 272B. The side ribs 285A, 285B may be load bearing ribs and may be configured to interface with the rib engagement grooves 275A, 275B of the back attachment rails 272A, 272B. Side ribs 285A, 285B may extend from the bottom surface of the right and left sides of the back frame boundary 193, and flanges 291A, 291B may be located on each side of the back frame boundary 193. The series of flanges 291A, 291B may extend perpendicular to the bottom surface of the back frame boundary 193 and the outer surfaces of the side ribs 275A, 275B. The side ribs 285A, 285B and the series of flanges 291A, 291B prevent the side ribs from twisting when the back rest is loaded. Accordingly, the side ribs 285A, 285B and the flanges 291A, 291B may relieve structural loads of the side attachment screw interfaces 284A, 284B when the backrest 140 and the backrest frame 141 are in an attached or detached state, and may also provide a complementary force to the force provided by the side attachment screw interfaces 284A, 284B in a state where the backrest 140 is attached to the backrest frame 141. In the attached state, the side ribs 285A, 285B may traverse in the lengthwise direction of the back attachment rails 272A, 272B, and the flanges 291A, 291B may traverse the horizontal area of the back attachment rails 272A, 272B. The number of flanges 291A, 291B may be selected based on the desired threshold load for the chair, the thickness of each flange, and the weight distribution of the chair.

Referring to fig. 6C, the side attachment screw interface 284A may be configured to be inserted through the side attachment hole 274A during removable attachment between the backrest 140 and the backrest frame 141. The side attachment screw interface 284A may be configured to receive a screw 294A to secure the backrest 140 to the backrest frame 141. For example, side attachment screw interface 284A may be inserted through side attachment hole 274A. The screw cover plate 295A may be removed from the side rail 272A to expose the side attachment screw interface 284A. After removing screw cover plate 295A, screw 294A is rotatably inserted into side attachment screw interface 284A. Similarly, a screw 294A is rotatably inserted into each of the side attachment screw interfaces 284A. After each of the screws 294A is inserted into the side attachment screw interface 284A, the screw cover plate 295A may be reattached to the side attachment rail 272A. Similar processing may be performed for side attachment screw interface 284B, side attachment hole 278B, screw cover plate 295B, and screws 295B.

In the manner described above, the backrest 140 may be configured to engage the side attachment rails 272A and 272B of the backrest frame 141 and the carrying handle 272 via the backrest frame boundary 193 and the plurality of protrusions formed thereon. In some cases, the back frame boundary 183 may be secured to the back frame 141 by positioning a first end (e.g., top) of the back frame boundary 193 in a first end (e.g., top) of the back frame 141, and rolling and/or flexing the back frame boundary 193 from the first end of the back frame 141 to a second end (e.g., bottom) of the back frame 141. The rolling and/or flexing of the back frame border 193 from the first end to the second end of the back frame 141 may align the plurality of protrusions of the back frame border 193 with the plurality of slots in the back attachment rail and removably attach the back frame border 193 on the back frame 141.

Alternatively, the back frame boundary 193 may be secured to the back frame 141 by inserting the bottommost attachment screw interface 284B to the left of the back frame boundary 193 into the bottommost attachment hole 274B of the left attachment rail 272B, and inserting the bottommost attachment screw interface 284A to the right of the back frame boundary 193 into the bottommost attachment hole 274A of the right attachment rail 272A. Next, the first, second, and third medial side attachment screw interfaces 284B on the left side of the back frame boundary 193 can be inserted into the first, second, and third medial side attachment holes 274B of the left side attachment rail 272B. Similarly, the first, second, and third medial side attachment screw interfaces 284A to the right of the back frame boundary 193 can be inserted into the first, second, and third medial side attachment holes 274A of the right side attachment rail 272A. Subsequently, the topmost attachment screw interface 284B to the left of the back frame boundary 193 can be inserted into the topmost attachment hole 274B of the left attachment rail 272B, and the topmost attachment screw interface 284A to the right of the back frame boundary 193 can be inserted into the topmost attachment hole 274A of the right attachment rail 272A. The backrest 140 may then be rolled and/or flexed in a rearward direction at the top of the backrest 140 via the backrest frame boundary 193 to align and insert the top attachment clamps 287, 287A and 287B of the backrest frame boundary 193 with the top attachment holes 277, 277A and 277B of the carrying handle 272, and to align and insert the top attachment clamps to the right of the backrest frame boundary 193 with the top attachment holes of the right end portion of the carrying handle 272. Next, screw cover plates 295A and 295B can be removed from side attachment rails 272A and 272B, and each of screws 294A and 294B can be threaded into a respective side attachment screw interface 284A and 284B. After insertion, the screw housing plates 295A and 295B may be reattached to the side attachment rails 272A and 272B.

In some cases, the back frame boundary 193 can have a plurality of back attachment clamps in the manner described above with respect to the seat frame boundary 183 opposite the back attachment screw interface 284A. In such cases, the side attachment clips may be configured to be inserted through the side attachment holes 274B during removable attachment between the backrest 140 and the backrest frame 141. The side attachment clip may have an extended rectangular configuration with a semi-arrowhead shaped distal end providing rotational flexibility during insertion and removal and vertical force distribution during engagement. For example, during insertion into the side attachment hole 274B, a rotational force may be applied to the outer surface of the half-arrow tip of the side attachment jig. In response to the rotational force, the side attachment jig may be configured to be rotatably displaced and inserted into the side attachment hole 274B. Upon completion of insertion and removal of the rotational force, the side attachment clamp may be configured to return to the resting position, and the upper surface and/or the depending surface of the half-arrow portion of the side attachment clamp may be configured to interface with the bottommost surface of the rib engagement groove 275B of the backrest attachment rail 272B. Such an interface provided by the side attachment clamp, in combination with the other side and top attachment clamps, may provide for removable attachment of the backrest 140 to the backrest 141.

In either case, the back frame border 193 may roll from the bottom end to the top end during assembly of the back frame border 193 with the back frame 141. Although such steps are described in a particular order from bottom to top, the steps need not be performed in such order, but rather may be performed in any particular order. Further, in a state where the backrest 140 is attached to the backrest frame 141, as shown in fig. 6C, the backrest frame boundary 193 may interface with the outside of the backrest frame 141. In some cases, the back frame boundary 193 may be machined after the injection molding process described above to provide finishing control of the back frame boundary-back frame interface.

Armrest

Referring back to fig. 1, the portable chair 100 may further include armrests 150A and 150B. The armrests 150A and 150B are pivotally attached to the armrest attachment portion of the back frame 141 by one or more pins, including pin 157B. Armrests 150A and 150B may be further configured to be attached to front joinery interface 116A and rear joinery interface 126A, respectively, by pins 128A, and front joinery interface 116B and rear joinery interface 126B, respectively, by pins 128B.

In one example, armrests 150A and 150B may be made of plastic, rubber, metal, carbon fiber, etc., and may be configured to carry a load of up to 500 pounds. In some cases, the armrests 150A and 150B may be used as buoyancy aids to prevent the portable chair 100 from submerging. Similarly, in one example, armrests 150A and 150B may be manufactured by a gas-assisted injection molding process to form a hollow cavity inside the armrests. Such hollow cavities may be used as a buoyancy aid for the chair 100.

Foldability

Referring to fig. 7A, the portable chair 100 may be a foldable portable chair. By actuating the rotational and pivotable interfaces, the portable chair 100 may be folded into a portable arrangement and unfolded into a seating arrangement. When in the folded, portable arrangement, the chair 100 may be locked and/or supported in the folded, portable arrangement by one or more detents. The one or more detents may provide resistance against the chair 100 opening from the folded portable arrangement to the unfolded seating arrangement. When in the deployed seating arrangement, the one or more detents may additionally provide resistance that resists closing of the chair 100 from the deployed seating arrangement to the folded portable arrangement.

As another example, the chair 100 may be configured to unfold from a folded, portable arrangement to an unfolded seating arrangement. In the folded, portable arrangement, the front legs 112A and 112B can be substantially parallel to the rear legs 122A and 122B, and the seat 130 can be substantially parallel to the backrest 140. One or more detents may be included in the attachment interface between seat joinery interfaces 133A and 133B of seat frame 131. Additionally and/or alternatively, the one or more stops may be included in the attachment interface between the leg attachment portions 170A and 170B and the front legs 112A and 112B via pins 171A and 171B.

The one or more detents can provide resistance against splaying displacement of the front legs 112A and 112B and seat 130 away from the rear legs 122A and 122B and backrest 140, and can thereby be used to lock and/or retain the chair in a folded, portable arrangement. In addition to resistance, the one or more detents may also provide intentional audible feedback to a user of the chair 100 when attempting to unfold the chair 100 from the folded, portable arrangement to the unfolded, seating arrangement, indicating that the chair 100 is in the locked position.

When in the folded, portable arrangement, the chair 100 may become openable and the front legs 112A and 112B and seat 130 may be rotatably displaced from the rear legs 122A and 122B and backrest 140 when an opening force applied to the chair 100 is greater than the locking force and/or resistance provided by the one or more detents. At this time, the chair 100 may be in an unlocked and temporary state between the folded portable arrangement and the unfolded seating arrangement. Upon continued application of the opening force, the chair 100 may achieve a maximum opening displacement and achieve a deployed seating arrangement. In the unfolded seat arrangement, the front legs 112A and 112B and the seat 130 may be angled relative to the rear legs 122A and 122B and the backrest 140.

Additionally, resistance to closing displacement of the front legs 112A and 112B and the seat 130 toward the rear legs 122A and 122B and the back 140 may be provided by one or more stops included in the attachment interface between the front leg attachment portions 170A and 170B and the front legs 112A and 112B by the pins 171A and 171B. Accordingly, in a deployed seat arrangement, the one or more detents may be used to lock and/or retain the chair 100 in the deployed seat arrangement. In addition to resistance, the one or more detents may also provide intentional audible feedback to a user of the chair 100 when attempting to close the chair 100 from the unfolded seating arrangement to the folded portable arrangement, indicating that the chair 100 is in the locked position. When the closing force applied to the chair 100 is greater than the locking force and/or resistance provided by the one or more detents when in the deployed seating arrangement, the chair 100 may become closable and the front legs 112A and 112B and seat 130 may rotatably move toward the rear legs 122A and 122B and back rest 140.

Cup holder

At the front leg 112A proximate the intersection with the front leg attachment portion 170A of the seat frame 131, the chair 100 may include a cup holder (not shown), as described in further detail below. In some cases, the cup holder can be rigidly attached to the first front leg 112A, while in other cases, the cup holder can be included in a releasably attached accessory.

In either case (e.g., a rigidly attached or releasably attached accessory), the cup holder can be configured to hold a cup, bottle, thermos, glass, jar, mug, or beverage container of any of a variety of sizes. The cup holder can be a vacuum insulated cup holder or an aerogel cup holder, and can be configured to maintain a temperature below or above ambient. The cup holder may be configured to cool the inserted beverage container and/or to retain and extend the time the inserted beverage container is below ambient temperature. Additionally and/or alternatively, the cup holder can be configured to receive an ice pack and/or natural ice cubes to help cool the inserted beverage container and/or extend its time below ambient temperature.

In one example, the chair 100 may include an accessory attachment interface (not shown) at the front leg 112A proximate the intersection with the front leg attachment portion 170A of the seat frame 131. The accessory attachment interface can be made as a front leg 112A and can be configured to receiveTundra accessories comprisingA beverage rack,A rod sleeve,Molle Zinger, and the like. Additionally, the accessory attachment interface may be configured to receive a waterproof storage case, an animal protection device, a fish finder, or the like.

Additionally and/or alternatively, the front leg 112B is adjacent to the front leg of the seat frame 131At the intersection of the attachment portions 170B, the chair 100 may include a rigidly attached cup holder, a releasably attached cup holder accessory, and/or an accessory attachment interface configured to receive a cup holder accessoryTundra accessories, and other accessories as described above.