阅读说明：本技术 一种双背框椅背结构 (Double-back-frame chair back structure ) 是由 李志芳 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种双背框椅背结构,包括上背框、下背框和支架,所述支架的中部向前侧凸出并设置有旋转轴孔和旋转手柄安装孔,所述下背框的上部通过设置在旋转轴孔中的旋转轴与支架活动连接,所述旋转手柄安装孔中设置有旋转手柄,所述旋转手柄连接有旋转件,所述旋转件为不规则的柱形结构,通过调节所述旋转手柄调节旋转件与下背框的接触位置,进而调节所述下背框的支撑角度；所述上背框固定设置在支架前侧的上部。本发明将整体式背框拆分成上下两个背框通过支架连接；下背框角度可调；对不同体型的人群的腰部都能很好的调节贴合,增加舒适度；上下背框和支架尺寸小,外形规则,适合小机台生产；便于包装、运输；结构简单,材质环保。(The invention discloses a double-back-frame chair back structure which comprises an upper back frame, a lower back frame and a bracket, wherein the middle part of the bracket protrudes towards the front side and is provided with a rotating shaft hole and a rotating handle mounting hole, the upper part of the lower back frame is movably connected with the bracket through a rotating shaft arranged in the rotating shaft hole, a rotating handle is arranged in the rotating handle mounting hole and is connected with a rotating piece, the rotating piece is of an irregular cylindrical structure, and the supporting angle of the lower back frame is adjusted by adjusting the rotating handle to adjust the contact position of the rotating piece and the lower back frame; the upper back frame is fixedly arranged on the upper part of the front side of the bracket. The integral back frame is split into an upper back frame and a lower back frame which are connected through a bracket; the angle of the lower back frame is adjustable; the waist of people with different body types can be well adjusted and attached, and the comfort level is increased; the upper back frame, the lower back frame and the bracket have small sizes and regular shapes, and are suitable for the production of small machines; is convenient for packaging and transportation; simple structure and environment-friendly material.)

1. A double-back-frame chair back structure is characterized by comprising an upper back frame, a lower back frame and a support, wherein the middle of the support protrudes to the front side and is provided with a rotating shaft hole and a rotating handle mounting hole, the upper part of the lower back frame is movably connected with the support through a rotating shaft arranged in the rotating shaft hole, a rotating handle is arranged in the rotating handle mounting hole and is connected with a rotating piece, the rotating piece is of an irregular cylindrical structure, and the supporting angle of the lower back frame is adjusted by adjusting the rotating handle to adjust the contact position of the rotating piece and the lower back frame; the upper back frame is fixedly arranged on the upper part of the front side of the bracket.

2. The double back frame chair back structure of claim 1, wherein a square boss is provided at a middle position of an upper end of a rear side of the lower back frame, a through hole is transversely provided at an upper portion of the square boss, and the rotation shaft passes through the through hole and is connected to the rotation shaft hole at an end portion; the rear side of the square boss is provided with a semicircular convex rib; the surface of the rotating part is sequentially provided with a plurality of arc-shaped gear grooves along the axial direction, the radius of each arc-shaped gear groove is matched with the corresponding semicircular convex rib, and the angle of the lower back frame is determined by the position where the semicircular convex ribs are clamped into the arc-shaped gear grooves.

3. The dual back frame chair back structure of claim 2, wherein the bracket is provided with a cushion resilient member, the cushion resilient member is zigzag-shaped, and one end of the cushion resilient member is fixed to the middle of the lower front portion of the bracket and the other end is fixed to the square boss of the lower back frame.

4. The chair back structure with double back frames as claimed in claim 1, wherein the two rotating handle mounting holes are located below the rotating shaft hole, an arc-shaped groove is formed between the two rotating handle mounting holes, the rotating member is disposed in the arc-shaped groove, and the connecting end of the rotating handle passes through the rotating handle mounting hole and is connected to the rotating member.

5. The double-back-frame chair back structure as claimed in claim 4, wherein a rectangular blind hole is formed at the end of the rotating member, a rectangular boss matched with the rectangular blind hole is formed at the end of the connecting end of the rotating handle, and the rectangular boss of the rotating handle is inserted into the rectangular blind hole of the rotating member and locked by a screw; the operating end of twist grip is the platykurtic, the operating end gradually extends to cylindric link, twist grip wholly is the L type.

6. The dual back frame chair back structure of claim 1, wherein the bracket is generally L-shaped, a lower end of the bracket extends forward to connect with a chassis of the chair, and a width of the bracket decreases gradually from bottom to top; and a decorative cover is arranged at the bottom of the rear side of the bracket.

7. The chair back structure with double back frames as claimed in claim 1, wherein the upper back frame is provided with fixing bosses at the middle position of the upper end and at the middle position of the lower end at the rear side, the fixing bosses are provided with screw thread holes, and the upper back frame and the bracket are fixedly connected with the screw thread holes through screws.

8. The dual back frame chair back structure of claim 1, wherein the upper back frame and the lower back frame are both quadrilateral frames, and both ends of the upper back frame and the lower back frame extend forward in a circular arc shape.

9. The dual back frame chair back structure of claim 8, wherein the upper back frame and the lower back frame are provided with grooves along the sides of the frame for receiving mesh cloth.

10. The dual back frame chair back structure of claim 3, wherein the cushioning resilient member is polyoxymethylene plastic.

Technical Field

The invention relates to the field of office furniture, in particular to a chair back structure with double back frames.

Background

The chair is used as a seat in daily activities such as life, work, study and the like, and has basic functions of comfort, convenience and safety. Office chair back frames in the market at present are generally large integral frames, and are overlarge in size and heavy in weight. Large injection molding machines are required for production, and the packaging and transportation costs are high. The waist position does not possess the fore-and-aft regulation function, and the people of different sizes, waist position are different, and the position that needs the support is different, and adjustable waist, support waist that can not be fine influences customer experience. Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a double-back-frame chair back structure which is provided with double back frames, and the angle of a lower back frame for supporting a waist is adjustable, so that the chair back structure is more comfortable.

The invention provides a double-back-frame chair back structure for solving the technical problems, which comprises an upper back frame, a lower back frame and a bracket, wherein the middle part of the bracket protrudes to the front side and is provided with a rotating shaft hole and a rotating handle mounting hole, the upper part of the lower back frame is movably connected with the bracket through a rotating shaft arranged in the rotating shaft hole, a rotating handle is arranged in the rotating handle mounting hole and is connected with a rotating piece, the rotating piece is of an irregular cylindrical structure, and the supporting angle of the lower back frame is further adjusted by adjusting the rotating handle to adjust the contact position of the rotating piece and the lower back frame; the upper back frame is fixedly arranged on the upper part of the front side of the bracket.

Furthermore, a square boss is arranged in the middle of the upper end of the rear side of the lower back frame, a through hole is transversely formed in the upper part of the square boss, and the rotating shaft penetrates through the through hole and is connected to the rotating shaft hole at the end part; the rear side of the square boss is provided with a semicircular convex rib; the surface of the rotating part is sequentially provided with a plurality of arc-shaped gear grooves along the axial direction, the radius of each arc-shaped gear groove is matched with the corresponding semicircular convex rib, and the angle of the lower back frame is determined by the position where the semicircular convex ribs are clamped into the arc-shaped gear grooves.

Furthermore, a buffering rebound part is arranged on the support and is Z-shaped, one end of the buffering rebound part is fixed to the middle of the lower portion of the front side of the support, and the other end of the buffering rebound part is fixed to the square boss of the lower back frame.

Furthermore, the turning handle mounting holes are formed below the turning shaft hole, the number of the turning handle mounting holes is two, an arc-shaped groove is formed between the two turning handle mounting holes, the rotating piece is arranged in the arc-shaped groove, and the connecting end of the turning handle penetrates through the turning handle mounting holes to be connected to the rotating piece.

Furthermore, a rectangular blind hole is formed in the end of the rotating piece, a rectangular boss matched with the rectangular blind hole is arranged at the end of the connecting end of the rotating handle, and the rectangular boss of the rotating handle is inserted into the rectangular blind hole of the rotating piece and is locked through a screw; the operating end of the rotary handle is flat, the operating end gradually extends to the cylindrical connecting end, and the rotary handle is L-shaped integrally.

Furthermore, the whole support is L-shaped, the lower end of the support extends towards the front side and is connected with a chassis of the seat, and the width of the support is gradually reduced from bottom to top; and a decorative cover is arranged at the bottom of the rear side of the bracket.

Furthermore, the middle position of the upper end of the rear side of the upper back frame and the middle position of the lower end of the rear side of the upper back frame are both provided with a fixing boss, a thread hole is formed in the fixing boss, and the upper back frame and the support are fixedly connected with the thread hole through screws in a locking mode.

Furthermore, the upper back frame and the lower back frame are both quadrilateral frames, and two ends of the upper back frame and the lower back frame extend towards the front side to form an arc shape.

Furthermore, grooves for mounting the screen cloth are formed in the upper back frame and the lower back frame along the side face of the frame.

Furthermore, the buffer resilient member is made of polyformaldehyde plastic.

Compared with the prior art, the invention has the following beneficial effects: according to the double-back-frame chair back structure, the integral back frame is split into the upper back frame and the lower back frame, and the upper back frame and the lower back frame are connected through the bracket; the upper back frame is fixed on the bracket, the lower back frame is connected to the bracket through a rotating shaft and can rotate around the rotating shaft, a rotating piece which is abutted against the lower back frame is arranged on the bracket, and the section of the rotating piece is similar to a cam; when the cam-shaped rotating piece rotates, the lower back frame is forced to rotate forwards; the angle adjustment of the lower back frame is realized; the waist of people with different body types can be well adjusted and attached, and the comfort level is increased; the upper back frame, the lower back frame and the bracket have small sizes and regular shapes, are suitable for the production of small machines and are flexible and changeable; the size of the component is small, so that the component is convenient to package and transport; simple structure and environment-friendly material.

Drawings

FIG. 1 is a front view of a dual back frame chair back configuration in accordance with an embodiment of the present invention;

FIG. 2 is a side cross-sectional view of a dual back frame chair back configuration in accordance with an embodiment of the present invention;

FIG. 3 is an exploded view of a dual back frame chair back structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of a stent structure according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an upper back frame according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a lower back frame according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a rotating member according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a rotary handle according to an embodiment of the present invention.

In the figure:

1. a support; 2. an upper back frame; 3. a lower back frame; 5. a cushioning rebound; 6. a rotating member; 7. a rotating shaft; 8. rotating the handle; 9. a decorative cover; 11. a rotation shaft hole; 12. rotating the handle mounting hole; 13. double bosses; 14. a circular arc-shaped groove; 15. a U-shaped groove; 16. a card slot; 21. a T-shaped boss; 22. fixing the boss; 31. a square boss; 32. a through hole; 33. a rib is protruded; 61. a rectangular blind hole; 62. a circular arc-shaped gear groove; 63. a glue reducing groove; 81. and a rectangular boss.

Detailed Description

The invention is further described below with reference to the figures and examples.

FIG. 1 is a front view of a dual back frame chair back configuration in accordance with an embodiment of the present invention; FIG. 2 is a side cross-sectional view of a dual back frame chair back configuration in accordance with an embodiment of the present invention; fig. 3 is an exploded view of a chair back structure with double back frames according to an embodiment of the invention.

Referring to fig. 1 to 3, the double-back-frame chair back structure of the embodiment of the invention comprises an upper back frame 2, a lower back frame 3 and a bracket 1, wherein the middle part of the bracket 1 protrudes to the front side and is provided with a rotating shaft hole 11 and a rotating handle mounting hole 12, the upper part of the lower back frame 3 is movably connected with the bracket 1 through a rotating shaft 7 arranged in the rotating shaft hole 11, the rotating handle 8 is arranged in the rotating handle mounting hole 12, the rotating handle 8 is connected with a rotating piece 6, the rotating piece 6 is of an irregular cylindrical structure, and the contact position of the rotating piece 6 and the lower back frame 3 is adjusted by adjusting the rotating handle 8, so that the supporting angle of the lower back frame 3 is adjusted; the upper back frame 2 is fixedly arranged at the upper part of the front side of the bracket 1.

Referring to fig. 4, in the dual-back-frame chair back structure according to the embodiment of the present invention, the bracket 1 is L-shaped as a whole, the lower end of the bracket 1 extends to the front side and is connected to the chassis of the seat through a bracket connection screw via hole disposed at the front side of the bottom, and the width of the bracket 1 is gradually reduced from bottom to top, from 140 mm to 50 mm; the bottom of the rear side of the bracket 1 is provided with a lightening hole and is provided with a decorative cover 9 for closed decoration.

Specifically, a decoration cover fixing screw through hole is formed in the position where the support 1 passes from the horizontal direction to the vertical direction of the bottom, and a screw is used for fixing the decoration cover 9 to the support 1 through the hole; a circular double boss 13 is arranged above the decorating cover fixing screw through hole, and a screw thread hole is formed in the center of the double boss 13 and used for fixing the buffer resilient piece 5 to the bracket 1; a circular arc-shaped groove 14 for accommodating the rotating piece 6 and allowing the rotating piece to rotate is arranged above the double bosses 13; two ends of the circular arc groove 14 are provided with rotating handle mounting holes 12 for mounting and connecting the rotating handle 8 of the rotating piece 6; a rotating shaft hole 11 is arranged above the rotating handle mounting hole 12 and is used for connecting the lower back frame 3 through a rotating shaft 7; two screw thread holes are arranged above the rotating shaft hole 11 and used for fixing the upper back frame 2 to the bracket 1; a U-shaped groove 15 is arranged above the thread hole and matched with a T-shaped boss 21 at the bottom of the upper back frame 2; the front side of the top of the bracket 2 is provided with a clamping groove 16, the clamping groove 16 is matched with a fixed boss 22 at the top of the upper back frame 2, and a screw through hole is formed in the clamping groove 16 and used for connecting the fixed boss 22 of the upper back frame 2.

Referring to fig. 5, in the dual-back-frame chair back structure according to the embodiment of the invention, the upper back frame 2 is a quadrilateral frame, two ends of the upper back frame 2 extend to the front side to form an arc shape fitting the human body, and the upper back frame 2 is provided with a groove for mounting mesh cloth along the side surface of the frame. A T-shaped boss 21 is arranged at the bottom of the rear side of the upper back frame 2, a fixed boss 22 is arranged at the top of the rear side of the upper back frame 2, and thread holes are formed in the T-shaped boss 21 and the fixed boss 22; the T-shaped boss 21 is matched with the U-shaped groove 15 at the lower end of the support 1, the fixing boss 22 is matched with the clamping groove 16 at the upper end of the support 1, a screw is connected to a screw thread hole of the upper back frame 2 through a screw through hole of the support 1 to fix the upper back frame 2, and the freedom degree of the lower back frame 3 in four directions, namely front, rear, left and right is limited.

Referring to fig. 6, in the dual-back-frame chair back structure according to the embodiment of the invention, the lower back frame 3 is a quadrilateral frame, two ends of the lower back frame 3 extend to the front side to form an arc shape fitting the human body, and the lower back frame 3 is provided with a groove for mounting mesh cloth along the side surface of the frame. A square boss 31 is arranged at the middle position of the upper end of the rear side of the lower back frame 3, a through hole 32 is transversely arranged at the upper part of the square boss 31 to allow the rotating shaft 7 to pass through, and the end part of the rotating shaft 7 is connected to the rotating shaft hole 11 of the bracket 1, so that the lower back frame 3 can rotate around the rotating shaft 7; the rear side of the square boss 31 is provided with a semicircular convex rib 33, the convex rib 33 is matched with the circular arc gear groove 62 of the rotating piece 6, and the angle of the lower back frame 3 is determined by the position of the convex rib 33 clamped into the circular arc gear groove 62; the bottom of the rear side of the square boss 31 is provided with a thread hole. A screw may fix the buffer resilient member 5 to the lower back frame 3 through the screw hole.

Specifically, be provided with buffering resilience piece 5 on support 1, buffering resilience piece 5 is the zigzag, and the one end of buffering resilience piece 5 is fixed to the centre of the front side lower part of support 1, and the other end is fixed to the square boss 31 of back of the body frame 3 down. The buffering rebound piece 5 is made of polyformaldehyde plastic and has certain elasticity. The buffering resilient member 5 connects the lower back frame 3 and the bracket 1, so that the lower back frame 3 in a free state is not too loose, not swayed, and not kept to return to the original position after rotating.

Referring to fig. 7, in the chair back structure with double back frames according to the embodiment of the invention, the whole cross section of the rotating member 6 is similar to a cam structure, and a plurality of circular arcs on the circumference are all non-concentric. The end part of the rotating piece 6 is provided with a rectangular blind hole 61 which is matched with a rectangular boss 81 at the connecting end of the rotating handle 8, the end part of the rotating piece 6 is also provided with a glue reducing groove 63, the cross section is special, and the depth is the same as that of the rectangular blind hole 61; a plurality of circular arc-shaped gear grooves 62 are arranged on the contact surface of the rotating piece 6 and the square boss 31 of the lower back frame 3 and are matched with the semicircular convex ribs 33 of the lower back frame 3; the plurality of arc-shaped gear grooves 62 are a plurality of gears, and when one gear is rotated, the lower back frame 3 is forced to rotate forwards by a certain radian; one side of the rectangular blind hole 61 is provided with a screw through hole opposite to the thread hole of the rectangular boss 81 of the rotating handle 8, and the rotating member 6 is fixed to the rotating handle 8 by a screw.

Referring to fig. 8, in the dual-back frame chair back structure according to the embodiment of the present invention, the operating end of the rotating handle 8 is flat, the operating end gradually extends to the cylindrical connecting end, the connecting end of the rotating handle 8 is provided with a rectangular boss 81, the rectangular boss 81 is matched with the rectangular blind hole 61 of the rotating member 6, and one side surface of the rectangular boss 81 is provided with a screw hole corresponding to the screw through hole of the rotating member 6.

In summary, in the dual-back-frame chair back structure according to the embodiment of the invention, the integral back frame is split into the upper back frame and the lower back frame, and the upper back frame and the lower back frame are connected through the bracket 1; the upper back frame 2 is fixed on the bracket 1, the lower back frame 3 is connected to the bracket 1 through a rotating shaft 7 and can rotate around the rotating shaft 7, a rotating piece 6 abutted against the lower back frame 3 is arranged on the bracket, and the section of the rotating piece 6 is similar to a cam; when the cam-shaped rotating piece 6 rotates, the lower back frame 3 is forced to rotate forwards; the angle adjustment of the lower back frame 3 is realized; the waist of people with different body types can be well adjusted and attached, and the comfort level is increased; the upper back frame, the lower back frame and the bracket 1 are small in size and regular in appearance, are suitable for production of small machines, and are flexible and changeable; the size of the component is small, so that the component is convenient to package and transport; simple structure and environment-friendly material.

Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.