阅读说明：本技术 一种休闲椅搁脚架的伸缩结构 (Telescopic structure of footrest of leisure chair ) 是由 陈永春 陆成龙 蒋燕东 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种休闲椅搁脚架的伸缩结构,包括坐框、第一、第二搁脚架以及伸缩装置,所述的第一搁脚架与坐框转动连接,第一、第二搁脚架之间通过滑动机构滑动配合；所述的伸缩装置包括一万向节连杆、第一连杆和第二连杆,所述的第一连杆与第二连杆之间为转动配合,且所述的第一连杆与第一搁脚架之间、第二连杆与第二搁脚架之间为转动配合；所述的万向节连杆两端分别与第一连杆和坐框之间为转动摇摆配合；所述的第二搁脚架在伸缩装置的作用下沿第一搁脚架滑动展开及收缩；通过连杆之间的转动及连杆与第一、第二搁脚板和坐框之间的转动连接,使得只需要通过控制万向节连杆的转动即可使第二搁脚架伸缩自如。(The invention discloses a telescopic structure of a footrest of a leisure chair, which comprises a seat frame, a first footrest, a second footrest and a telescopic device, wherein the first footrest is rotationally connected with the seat frame, and the first footrest and the second footrest are in sliding fit through a sliding mechanism; the telescopic device comprises a universal joint connecting rod, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are in rotating fit, and the first connecting rod and the first footrest and the second connecting rod and the second footrest are in rotating fit; two ends of the universal joint connecting rod are respectively in rotating and swinging fit with the first connecting rod and the seat frame; the second footrest is extended and contracted along the first footrest in a sliding way under the action of the telescopic device; the second footrest can be freely extended and retracted only by controlling the rotation of the universal joint connecting rod through the rotation between the connecting rods and the rotation connection between the connecting rods and the first footrest, the second footrest and the seat frame.)

1. A telescopic structure of a footrest of a leisure chair is characterized by comprising a seat frame, a first footrest, a second footrest and a telescopic mechanism for driving the second footrest, wherein the first footrest is rotationally connected with the seat frame, and the first footrest and the second footrest are in sliding fit through a sliding mechanism; the telescopic mechanism comprises a universal joint connecting rod, a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are in rotating fit, and the first connecting rod and the first footrest and the second connecting rod and the second footrest are in rotating fit; two ends of the universal joint connecting rod are respectively connected to the first connecting rod and the seat frame, and the universal joint connecting rod and the first connecting rod and the universal joint connecting rod and the seat frame are respectively in rotating and swinging fit; the second footrest is extended and contracted along the first footrest in a sliding way under the action of the telescopic mechanism.

2. The telescopic structure of a footrest of a leisure chair according to claim 1, characterized in that: the first footrest comprises a first footrest and connecting vertical plates respectively connected to the left side and the right side of the first footrest, and the connecting vertical plates are sheet metal parts; the seat frame is correspondingly provided with a rotary connecting plate, and the connecting vertical plate is rotatably connected with the rotary connecting plate.

3. The telescopic structure of a footrest of a leisure chair according to claim 2, characterized in that: the second footrest comprises a second footrest, the sliding mechanism comprises an upper guide rail and a lower guide rail, and the lower guide rail plays a role in sliding and supporting the upper guide rail; the lower guide rails are fixedly connected to the connecting vertical plate, and the upper guide rails are respectively fixedly connected to two sides of the second footrest; after the second foot rest is in sliding fit with the first foot rest, the second foot rest is stacked above the first foot rest.

4. A telescopic structure of a footrest of a leisure chair according to claim 3, characterized in that: the upper guide rail is provided with a dovetail groove with a downward opening, and the lower guide rail is provided with a sliding support part in sliding fit with the dovetail groove; two installation vertical plates which are opposite at intervals extend downwards along the sliding support part, a clamping groove is formed between the two installation vertical plates, and the connecting vertical plate is embedded in the clamping groove; and the upper guide rail and the lower guide rail are made of plastic materials.

5. The telescopic structure of a footrest of a leisure chair according to claim 4, characterized in that: the upper guide rail comprises a left guide block and a right guide block which are connected in an involutory manner, and the inner enclosed parts of the left guide block and the right guide block after involutory form the dovetail groove; and the left guide block and the right guide block are connected and fixed on the lower surface of the second footrest after being involuted.

6. The telescopic structure of a footrest of a leisure chair according to claim 1, characterized in that: the middle part of the first connecting rod is rotationally connected with the first footrest, the front end of the first connecting rod is rotationally connected with the rear end of the second connecting rod, the rear end of the first connecting rod is rotationally matched with the front end of the universal joint connecting rod in a swinging manner, and the rear end of the universal joint connecting rod is rotationally matched with the seat frame in a swinging manner.

7. The telescopic structure of a footrest of a leisure chair according to claim 6, characterized in that: the connecting structure is characterized in that a connecting transverse plate is arranged below the first footrest frame, two ends of the connecting transverse plate are respectively connected to the left side and the right side of the first footrest frame, and the first connecting rod is located below the connecting transverse plate and is rotatably connected with the connecting transverse plate.

8. The telescopic structure of a footrest of a leisure chair according to claim 6, characterized in that: the second connecting rod comprises an upper connecting rod and a lower connecting rod which are staggered in height, the rear end of the lower connecting rod is rotatably connected with the front end of the first connecting rod, and the front end of the upper connecting rod is rotatably connected with the front end of the second foot rest.

9. The telescopic structure of a footrest of a leisure chair according to claim 6, characterized in that: the two ends of the universal joint connecting rod are both ball joint universal joints, the front end of the seat frame is provided with a downward mounting plate, and the ball joint universal joints are respectively in rotating and swinging fit with the mounting plate and the first connecting rod.

10. A seat comprising a seat arm, a base support and a telescopic structure of a footrest of a leisure chair according to any of claims 1 to 8.

Technical Field

The invention relates to the field of seats, in particular to a telescopic structure of a footrest of a leisure chair.

Background

The leisure chair is one of furniture which is necessary for home furnishing and kilometers handling, and people can easily feel fatigue when sitting for a long time in most of the time when sitting for a long time, and the most direct way for solving the fatigue is to rest at a desk, and the posture of the rest at the desk has certain damage to cervical vertebra, lumbar vertebra and the like, so that the body of a human body is seriously influenced for a long time. Therefore, people can rest on the leisure chair to become the first choice of people, but when people lie on the leisure chair, the feet of people are not placed at proper positions, so that people are not comfortable when lying on the chair. Therefore, more and more seats are provided with a seat footrest which can enable legs to be stretched flat and play a role in promoting blood circulation, the seat footrest is usually folded below the seat frame, and is overturned and unfolded from the lower part of the seat frame when in use; generally, the seat is designed to have a foot rest long enough to allow the human body to rest all the feet, so that the human body feels more comfortable; but because the seat foot rest is folded in sitting the frame below, so the length of seat foot rest receives the restriction of sitting the frame height, common way is to divide into a plurality of bracket subassemblies with the foot rest, expand the shrink through extending structure between the bracket subassembly, thereby make the foot rest can contract to place and reach sufficient length requirement after expanding, but current extending structure often establishes on the both sides of two interconnect's bracket subassembly, realize the shrink of foot rest through articulated and increase a plurality of connecting rods between the bracket subassembly, such extending structure often the structure is too loaded down with trivial details complicated, processing installation cost is higher.

Disclosure of Invention

The invention overcomes the defects in the prior art and provides a telescopic structure of a footrest of a leisure chair, which comprises a seat frame, a first footrest, a second footrest and a telescopic device for driving the second footrest; the first footrest and the second footrest are in sliding fit, the telescopic device is simple in structure and connected below the footrest, the telescopic device comprises a universal joint connecting rod, a first connecting rod and a second connecting rod, the first connecting rod and the first footrest and the second connecting rod and the second footrest are in rotating fit, the first connecting rod and the second connecting rod are in rotating fit, the universal joint connecting rod and the first connecting rod and the universal joint connecting rod and the seat frame are respectively in rotating and swinging fit, and the second footrest can be controlled to be slidably unfolded and retracted along the first footrest by controlling the universal joint connecting rod; the control is convenient, and the structural design is simple.

The technical scheme of the invention is realized as follows:

a telescopic structure of a footrest of a leisure chair comprises a seat frame, a first footrest, a second footrest and a telescopic device for driving the second footrest, wherein the first footrest is rotatably connected with the seat frame, and the first footrest and the second footrest are in sliding fit through a sliding mechanism; the telescopic device comprises a universal joint connecting rod, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are in rotating fit, and the first connecting rod and the first footrest and the second connecting rod and the second footrest are in rotating fit; two ends of the universal joint connecting rod are respectively connected to the first connecting rod and the seat frame, and the universal joint connecting rod and the first connecting rod and the universal joint connecting rod and the seat frame are respectively in rotating and swinging fit; the second footrest is extended and contracted along the first footrest in a sliding way under the action of the telescopic device. The second footrest can be freely extended and retracted only by controlling the rotation of the universal joint connecting rod through the rotation between the connecting rods and the rotation connection between the connecting rods and the first footrest, the second footrest and the seat frame.

Preferably, the first footrest comprises a first footrest and connecting vertical plates respectively connected to the left side and the right side of the first footrest, and the connecting vertical plates are sheet metal parts; the seat frame is correspondingly provided with a rotary connecting plate, and the connecting vertical plate is rotatably connected with the rotary connecting plate. Thereby connect riser and rotation connecting plate and rotate and be connected and realize that the foot rest can overturn around sitting the frame.

Preferably, the second footrest comprises a second footrest, the sliding mechanism comprises an upper rail and a lower rail, and the lower rail plays a role in sliding and supporting the upper rail; the lower guide rails are fixedly connected to the connecting vertical plate, and the upper guide rails are respectively fixedly connected to two sides of the second footrest; after the second foot rest is in sliding fit with the first foot rest, the second foot rest is stacked above the first foot rest. Through setting up upper and lower guide rail for the second bracket can expand and contract relatively first bracket slip.

Preferably, the upper guide rail is provided with a dovetail groove with a downward opening, and the lower guide rail is provided with a sliding support part in sliding fit with the dovetail groove; two installation vertical plates which are opposite at intervals extend downwards along the sliding support part, a clamping groove is formed between the two installation vertical plates, and the connecting vertical plate is embedded in the clamping groove; and the upper guide rail and the lower guide rail are made of plastic materials. Adopt plastics material to make the processing cost lower, and set up the spout between the guide rail into the dovetail structure for the second bracket is when sliding, and the atress is the normal pressure between the upper and lower guide rail, and can increase the lifting surface area, makes upper and lower guide rail more durable.

Preferably, the upper guide rail comprises a left guide block and a right guide block which are matched with each other in an involutory manner, and the dovetail groove is formed by the inner surrounding part of the involutory left guide block and the involutory right guide block; and the left guide block and the right guide block are connected and fixed on the lower surface of the second footrest after being involuted. The upper guide rail is formed by combining the left guide block and the right guide block, so that the stress dispersion of the upper guide rail is more uniform when the upper guide rail slides.

Preferably, the middle part of the first connecting rod is rotatably connected with the first footrest, the front end of the first connecting rod is rotatably connected with the rear end of the second connecting rod, the rear end of the first connecting rod is rotatably and wavily matched with the front end of the universal joint connecting rod, and the rear end of the universal joint connecting rod is rotatably and wavily matched with the seat frame. Through setting up the universal joint connecting rod for can carry out the rotation of multi-angle better at the certain extent between universal joint connecting rod and first connecting rod and the seat frame.

Preferably, a connecting transverse plate is arranged below the first footrest, two ends of the connecting transverse plate are respectively connected to the left side and the right side of the first footrest, and the first connecting rod is positioned below the connecting transverse plate and is rotatably connected with the connecting transverse plate.

Preferably, the second connecting rod comprises an upper connecting rod and a lower connecting rod which are staggered in height, the rear end of the lower connecting rod is rotatably connected with the front end of the first connecting rod, and the front end of the upper connecting rod is rotatably connected with the front end of the second foot rest. The upper connecting rod and the lower connecting rod are arranged, so that the upper connecting rod is rotationally connected with the second footrest, and the lower connecting rod and the first connecting rod are positioned on the same horizontal plane.

Preferably, both ends of the universal joint connecting rod are ball joint universal joints, the front end of the seat frame is provided with a downward mounting plate, and the ball joint universal joints are in rotating and swinging fit with the mounting plate.

A chair comprises a chair supporting leg, a bottom supporting seat and a telescopic structure of a footrest of a leisure chair.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

according to the invention, the universal joint connecting rod, the first connecting rod and the second connecting rod are arranged to form the telescopic device, and the first footrest and the second footrest are in sliding fit through the sliding mechanism; the first connecting rod and the second connecting rod are in running fit, and the first connecting rod and the first footrest and the second connecting rod and the second footrest are in running fit; the universal joint connecting rod and the first connecting rod and the universal joint connecting rod and the seat frame are respectively in rotary swing connection; make when the universal joint connecting rod is rotating around sitting the frame, can drive first, second connecting rod to the slip of control second bracket on first bracket is flexible, this telescoping device simple structure and easy installation.

Drawings

FIG. 1 is a schematic top perspective view of an embodiment of the present invention showing a footrest folded under a seat frame;

FIG. 2 is a schematic top perspective view of an embodiment of the present invention illustrating a semi-flipped and unfolded state of a footrest relative to a seat frame;

FIG. 3 is a schematic top perspective view of the footrest in a fully flipped and unfolded state relative to the seat frame in an embodiment of the present invention;

FIG. 4 is a schematic bottom perspective view of the foldable footrest shown in the embodiment of the present invention when folded under the seat frame; (ii) a

FIG. 5 is a schematic bottom perspective view of the semi-flipped and unfolded state of the footrest relative to the seat frame in the embodiment of the present invention;

FIG. 6 is a schematic bottom perspective view of the fully flipped and unfolded state of the footrest relative to the seat frame in the embodiment of the present invention;

FIG. 7 is a schematic side perspective view of the foldable footrest shown retracted under the seat frame in an embodiment of the present invention;

FIG. 8 is a schematic side perspective view of a semi-flipped and unfolded state of the footrest relative to the seat frame in an embodiment of the present invention;

FIG. 9 is a schematic side perspective view of the footrest in a fully flipped and unfolded state relative to the seat frame in an embodiment of the present invention;

FIG. 10 is an enlarged view of portion A of FIG. 9;

FIG. 11 is a schematic perspective view of the seat frame, the bottom support base and the retractable device according to the embodiment of the present invention;

FIG. 12 is an enlarged view of detail B of FIG. 11;

FIG. 13 is a schematic perspective view showing the connection relationship between the first and second foot rests and the telescopic mechanism according to the embodiment of the present invention;

FIG. 14 is a schematic perspective view showing a collapsed configuration of the foot rest according to the embodiment of the present invention;

fig. 15 is a schematic perspective view of upper and lower rails according to an embodiment of the present invention.

The figures are numbered: a seat frame 1; a bottom support base 2; a support base plate 2 a; a support side plate 2 b; a mounting hole 2 c; a seat arm a; a vertical support rod b; a telescoping device 3; a footrest frame 4; a first foot rest 5 a; a second foot rest 5 b; a front cross bar 6 a; a rear cross bar 6 b; a left vertical bar 7 a; a right vertical bar 7 b; a reinforcing vertical bar 8; the sliding mechanism 9 is rotated; rotating the slider 10; a guide bar 11; a guide bar cross bar 12; a guide rod vertical bar 13; the mating member 10 a; a groove 14; a telescopic push rod 15; a first support plate 16; a second support plate 17; a first rocker 18; a through hole 19; a rotating shaft 20; a first footrest 21; a connecting vertical plate 22; the connecting plate 23 is rotated; a rotating link 24; a second rocking lever 25; a second footrest 26; a supporting upright plate 27; a slide mechanism 28; a guide rail 2 a; an upper rail 29 b; a telescoping mechanism 30; a gimbal link 31; a first link 32; a second link 33; a connecting rail 34; an upper link 33 a; a lower link 33 b; a connecting diagonal rod 33 c; a ball joint 35; a mounting plate 36; a guide block 37 is made; the insert post 37 a; a right guide block 38; a latch 38 a; a dovetail groove 39; a slide support portion 40; a slope 40 b; a sliding plane 40 a; installing a vertical plate 41; a card slot 42.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more than one unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiment of the invention is as follows:

as shown in fig. 1 to 15, the present invention provides a leg rest extension structure of a leisure chair, comprising a seat frame 1, a bottom support base 2 connected to a seat arm a, a leg rest 4 connected to the seat frame 1, and an extension device 3 for raising and lowering the seat frame 1.

As shown in fig. 1 to 12, the bottom supporting base 2 includes a supporting bottom plate 2a and supporting side plates 2b, the supporting side plates 2b are formed by extending along two sides of the supporting bottom plate 2a in a forward and upward direction, a mounting hole 2c is formed in the middle of the supporting bottom plate 2a, a vertical supporting rod b is arranged in the middle of the seat arm a, the vertical supporting rod b can be an air rod, and the supporting bottom plate 2a and the seat arm a are rotatably inserted and matched through the mounting hole 2 c; the seat frame 1 is positioned above the bottom supporting seat 2, the seat frame 1 is a frame shaped like a Chinese character 'kou', the seat frame 1 comprises a front transverse rod 6a, a rear transverse rod 6b, a left longitudinal rod 7a, a right longitudinal rod 7b and reinforcing longitudinal rods 8 arranged at intervals, and two ends of each reinforcing longitudinal rod 8 are respectively connected and fixed on the front transverse rod 6a and the rear transverse rod 6 b; the rear end of the seat frame 1 and the rear end of the bottom supporting seat 2 are in rotational sliding fit, and specifically refer to: a rotary sliding mechanism 9 is arranged between the reinforcing vertical rod 8 on the seat frame 1 and the supporting side plate 2b on the bottom supporting seat 2; as shown in fig. 7, 11 and 12, the rotary sliding mechanism 9 includes a rotary slider 10 and a guide rod 11, the guide rod 11 includes a guide rod cross bar 12 and a guide rod vertical bar 13 extending upward from two sides of the guide rod cross bar 12 in the vertical direction, and the guide rod vertical bar 13 is connected and fixed on the inner side of the reinforcing vertical bar 8; the rotating slide block 10 is formed by folding two folding pieces 10a, grooves 14 are arranged at the upper parts of the folding pieces 10a, and after the two folding pieces 10a are folded, the grooves 14 on the two folding pieces 10a are folded to form a sliding chute in sliding fit with the guide rod cross rod 12; when the device is installed, the guide rod cross rod 12 is matched with the groove 14 on one of the butting parts 10a, then the other butting part 10a is butted with the guide rod cross rod, and the two butting parts 10a are connected and fixed through screws; the two oppositely-combined parts 10a are oppositely combined and fixed to form the rotating slide block 10, and the lower part of the rotating slide block 10 is in running fit with the rear end position of the supporting side plate 2b through the rotating shaft 20, so that the seat frame 1 and the supporting side plate 2b can relatively rotate and slide.

As shown in fig. 11, the telescopic device 3 is a telescopic push rod 15, and specifically, the telescopic push rod 15 is an electric push rod; correspond on preceding horizontal pole 6a and the supporting baseplate 2a on the seat frame 1 and be equipped with first backup pad 16 and second backup pad 17, first backup pad 16 down and the upper end of first backup pad 16 connect to be fixed on preceding horizontal pole 6a, second backup pad 17 up and the bottom of second backup pad 17 connect to be fixed on supporting baseplate 2a, the head of telescopic push rod 15 articulated with first backup pad 16, telescopic push rod 15's afterbody is articulated with second backup pad 17.

As shown in fig. 4-11, a first rocker 18 is disposed between the front portion of the seat frame 1 and the front end of the supporting side plate 2b, and two ends of the first rocker 18 are respectively hinged to the reinforcing vertical rod 8 and the supporting side plate 2b on the seat frame 1, specifically: as shown in fig. 11, through holes 19 are respectively formed at two ends of the first rocker 18, the through holes 19 are correspondingly formed at the front end position of the reinforced vertical rod 8 and the front end position of the supporting side plate 2b, when the device is installed, after the through holes 19 at two ends of the first rocker 18 are respectively aligned with the through holes 19 on the reinforced vertical rod 8 and the supporting side plate 2b, a rotating shaft 20 is arranged on the through holes 19 in a penetrating manner, so that the upper end of the first rocker 18 is hinged with the reinforced vertical rod 8, and the lower end of the first rocker 18 is hinged with the supporting side plate 2 b; and the hinged position between the telescopic push rod 15 and the seat frame 1 is positioned in front of the hinged position between the first rocker 18 and the supporting side plate 2b, so that the seat frame 1 can drive the first rocker 18 to rotate under the action of the telescopic push rod 15.

As shown in fig. 1-11, the footrest 4 includes a first footrest 5a and a second footrest 5b, the first footrest 5a includes a first footrest 21 and connecting upright plates 22 respectively connected to the left and right sides of the first footrest 21, the connecting upright plates 22 are sheet metal parts, and have high strength and are economical, a rotating connecting plate 23 is correspondingly arranged on the front cross bar 6a of the seat frame 1, and the connecting upright plates 22 and the rotating connecting plate 23 are rotatably connected by a penetrating rotating connecting rod 24, so that the first footrest 5a can be turned over around the front end of the seat frame 1; a second rocker 25 is connected between the rear part of the connecting vertical plate 22 and the front part of the supporting side plate 2b, the upper end of the second rocker 25 is hinged with the connecting vertical plate 22, and the hinged position of the second rocker 25 and the connecting vertical plate 22 is positioned in front of the rotary connecting position of the connecting vertical plate 22 and the rotary connecting plate 23; the lower end of the second rocker 25 is hinged to the supporting side plate 2b, and the hinged position is the same as the hinged position of the first rocker 18 and the supporting side plate 2b, specifically: as shown in fig. 11, a through hole 19 is formed at the lower end of the second rocker 25, and a rotating shaft 20 penetrating through the rotating connection between the lower end of the first rocker 18 and the supporting side plate 2b is continuously penetrated through the through hole 19 at the lower end of the second rocker 25, so that a four-bar linkage is formed among the first rocker 18, the seat frame 1, the second rocker 25 and the leg rest 4.

As shown in fig. 6, 13, 14 and 15, the second footrest 5b is stacked on the first footrest 5a, the second footrest 5b includes a second footrest 26, and a pair of vertical supporting plates 27 are disposed on two sides of the second footrest 26 at intervals; the second foot rest 5b is in sliding fit with the first foot rest 5a through a sliding mechanism 28, specifically: the sliding mechanism 28 includes a lower guide rail 29a and an upper guide rail 29b, the lower guide rail 29a is connected and fixed on the connecting vertical plate 22, the upper guide rail b is correspondingly connected on the lower surface of the second footrest 26, the upper and lower guide rails are made of plastic material, so that the production cost can be reduced, the upper guide rail 29b is provided with a dovetail groove 38 with a downward opening, the upper guide rail 29b includes two left and right guide blocks 37, 38 which are paired together, and the left and right guide blocks 37, 38 are paired together in an insertion manner, specifically: the top of the right guide block 38 is provided with a transverse bolt 38a, the left guide block 37 is correspondingly provided with a transverse insertion column 37a, the insertion column 37a is provided with an insertion hole, when in installation, the bolt 38a is inserted into the insertion hole, so that the left guide block 37 and the right guide block 38 are aligned together, and the left guide block and the right guide block can be quickly positioned and installed in an insertion and matching manner, thereby reducing the use of screws; the inner surrounding part of the left and right guide blocks 37 and 38 forms the dovetail groove 39 after the left and right guide blocks 37 and 38 are folded, and the left and right guide blocks 37 and 38 are clamped between the supporting vertical plates 27 after being folded; the sliding groove between the guide rails is arranged to be of a dovetail groove structure, so that when the second footrest slides, the stress between the upper guide rail and the lower guide rail is positive pressure, the stress area can be increased, and the guide rails are more durable.

The upper part of the lower guide rail 29a is provided with a sliding support part 40 which is in sliding fit with the dovetail groove 39, the sliding support part 40 comprises a sliding plane 40a at the top end and inclined planes 40b at the left side and the right side, and after the inclined planes 40b are in inserted fit with the dovetail groove 39 on the upper guide rail 29b, the upper guide rail 29a and the lower guide rail 29b can slide relatively; two installation vertical plates 41 opposite to each other at intervals extend downwards along the sliding support part 40, a clamping groove 42 is formed between the two installation vertical plates 41, the lower guide rail 29a is connected and fixed on the first foot rest 1 through the installation vertical plates 41, and the installation mode is specifically that: during installation, the connecting vertical plate 22 is embedded into the clamping groove 42, then the connecting vertical plate 22 and the installing vertical plate 41 are connected and fixed through the transversely arranged screws, the connecting vertical plate 22 adopts a sheet metal part to strengthen the strength of the joint of the lower guide rail 29a and the first foot rest 5a, and the service life of the guide rail is prolonged. And the upper guide rail and the lower guide rail are made of plastic materials, so that the price cost can be reduced, and the replacement is easy.

A telescopic mechanism 30 is arranged below the seat frame 1, the first foot rest 5a and the second foot rest 5b, the telescopic mechanism 30 can control the sliding and stretching of the second foot rest 5b, and the telescopic mechanism 30 comprises a universal joint connecting rod 31, a first connecting rod 32 and a second connecting rod 33; the first connecting rod 31 and the second connecting rod 32 are in running fit, and the first connecting rod 32 and the first foot rest 5a and the second connecting rod 33 and the second foot rest 5b are in running fit, specifically: a connecting transverse plate 34 is arranged on the first foot rest 5a, two ends of the connecting transverse plate 34 are respectively connected and fixed on the connecting vertical plate 22, the first connecting rod 32 is positioned below the connecting transverse plate 34, and the middle part of the first connecting rod 32 is rotatably connected with the connecting transverse plate 34 through a rotating shaft 20; the second connecting rod 33 comprises an upper connecting rod 33a and a lower connecting rod 33b which are staggered in height, the upper connecting rod and the lower connecting rod are connected through a connecting inclined rod 33c, the front end of the upper connecting rod 33a is rotatably connected to the middle position of the front end of the second footrest 26, the lower connecting rod 33b and the first connecting rod 32 are positioned on the same horizontal plane, and the rear end of the lower connecting rod 33b is rotatably connected with the front end of the first connecting rod 32. The two ends of the universal joint connecting rod 31 are respectively connected to the first connecting rod 32 and the seat frame front cross rod 6a, the two ends of the universal joint connecting rod 31 are both ball joint universal joints 35, the front end of the universal joint connecting rod 31 is rotatably and swingably matched with the rear end of the first connecting rod 32, the seat frame front cross rod 6a is provided with a downward mounting plate 36, and the rear end of the universal joint connecting rod 31 is rotatably and swingably matched with the mounting plate 36.

As shown in fig. 1, 4 and 7, when the seat is in a normal use state, the foot rest 4 is folded and contracted below the seat frame 1, and the rotating slider 10 is positioned at the rear end of the guide rod cross bar 12; when the foot rest 4 needs to be unfolded for resting feet, the telescopic push rod 15 is controlled to be retracted backwards, and in the process that the telescopic push rod 15 is retracted backwards, as shown in fig. 2, 5 and 8, the telescopic push rod 15 drives the seat frame 1 to move backwards through the first support plate 16, the seat frame 1 simultaneously drives the first rocker 18, so that the first rocker 18 rotates backwards around the support side plate 2b to a pulled-up position, the front end of the seat frame 1 is lifted up and tilted upwards after the first rocker 18 is pulled up, and the seat frame 1 integrally slides backwards through the rotating slide block 10 while the front end of the seat frame 1 is lifted up; when sitting frame 1 front end upwarp and the motion of wholly shifting backward, sit frame 1 and can drive first foot rest 5a and overturn forward simultaneously, specifically mean: a four-bar linkage mechanism is formed among the seat frame 1, the first rocker 18, the second rocker 25 and the first foot rest 5a, when the front end of the seat frame 1 tilts up and moves backwards, the rotating connecting plate 23 on the front cross rod 6a of the seat frame pulls the first foot rest 5a backwards, and the first foot rest 5a turns forwards by taking the hinged point of the second rocker 25 and the connecting vertical plate 22 as a rotating point; meanwhile, when the first foot rest 5a is turned forwards, the universal joint connecting rod 31 is enabled to rotate forwards relative to the mounting plate 36, the connecting end of the universal joint connecting rod 31 and the first connecting rod 32 pulls the first connecting rod 32 backwards to enable the first connecting rod 32 to rotate relative to the connecting cross rod 34, the first connecting rod 32 rotates and simultaneously drives the second connecting rod 33 to rotate, and the second connecting rod 33 rotates to enable the second foot rest 5b to slide and unfold along the first foot rest 5 a; as shown in fig. 3, 6 and 9, when the telescopic push rod 15 is completely retracted, the front end of the seat frame 1 is tilted up to the maximum height, the first foot rest 5a is completely turned forward, and the second foot rest 5b slides forward relative to the first foot rest 5 a.

According to the leisure chair, in the movement process that the front end of the seat frame 1 is driven to upwarp by the telescopic device 3 and the seat frame 1 integrally moves backwards, the first foot rest 5a can be linked with the seat frame 1, the first foot rest 5a simultaneously turns forwards, and the telescopic mechanism 30 controls the second foot rest 5b to slide and unfold along the first foot rest 5a due to the turning of the first foot rest 5 a; the opening and closing of the footrest 4 can be completed only by controlling the telescopic device 3; in addition, in the process of turning and unfolding the first and second leg rest 5a, 5b, the front end of the seat frame 1 can be upwarped and lifted for a certain height, so that the foot rest 4 can be ensured not to wipe the feet and the ground in the process of extending the leg rest 4 under the condition that the leg rest 4 is designed to be long enough; and after the footrest 4 overturns and expands, the seat frame can wholly move backwards, so that the occupation of the front space after the footrest extends out can be reduced, the furniture is prevented from being interfered, and the integral design is very reasonable and humanized.