Backrest chair

Abstract

The utility model relates to a back-rest chair which comprises a chair back, the chair back comprises a chair back support, a chair back frame and a waist rest, the chair back support comprises a first fixing part and a second fixing part, the first fixing part is arranged towards the height direction of the chair and located on the rear side of the chair back frame, and the waist rest can be fixed on the first fixing part in an up-and-down lifting adjustment mode; the second fixing part extends towards the lower end of the chair seat and is fixed on the base; the chair back frame is of a tubular structure, and the lower end of the chair back frame is bent forwards to form a connecting end; a connecting groove with an upward opening is formed in the second fixing portion of the chair back support, the connecting end of the chair back frame is arranged in the connecting groove, and after installation is completed, the connecting end of the chair back frame is located between the second fixing portion and the chair seat. According to the scheme, the fixing structure between the chair back frame and the chair back bracket is simple, and the height of the waist rest can be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of office chairs, in particular to a chair with a backrest. Background Art

[0002] A backrest chair usually has several parts, including a leg, a seat and a backrest. Considering the comfort of use, a lumbar support is usually provided on the backrest. In the prior art, a common backrest of a backrest chair mainly includes a backrest frame and a backrest material fixed by the backrest frame, and the backrest contour is defined and supported by the backrest frame. The lumbar support is usually fixed to the backrest frame, and the position of the lumbar support cannot be adjusted. It has poor adaptability to different users and cannot provide a good support effect on the user's waist. Part of the backrest frame is fixed to the seat through a backrest bracket. If the backrest bracket is fixed to the bottom of the backrest frame, the backrest frame needs to be set as a complete frame structure; if the left and right sides of the backrest frame are fixed to the backrest bracket, due to the large distance between the left and right sides of the backrest frame, it is necessary to set a connecting edge connecting the left and right sides on the backrest bracket or the backrest frame to fix it to the backrest bracket; it can be seen that the above-mentioned connection structure between the backrest frame and the backrest bracket requires more consumables and is more complicated in structure. Summary of the invention

[0003] In order to solve the above problems, the utility model aims to provide a backrest chair, wherein the fixing structure between the backrest frame and the backrest bracket is simple and the lumbar support can be adjusted in height.

[0004] A chair with a backrest comprises a chair back, which comprises a chair back bracket, a chair back frame and a lumbar support, the chair back bracket comprises a first fixing part and a second fixing part, the first fixing part is arranged in the direction of the chair height and is located at the rear side of the chair back frame, and the lumbar support can be adjusted up and down and fixed to the first fixing part; the second fixing part extends toward the lower end of the seat and is fixed to the base; the chair back frame is a tubular structure, and the lower end of the chair back frame is bent forward to form a connecting end; the second fixing part of the chair back bracket is provided with a connecting groove opening upward, and the connecting end of the chair back frame is placed in the connecting groove, and after installation, the connecting end of the chair back frame is located between the second fixing part and the seat.

[0005] Preferably, the seat back bracket is L-shaped, and the first fixing portion of the seat back bracket gradually increases in width from top to bottom.

[0006] Preferably, a vertically arranged slide rail is formed at the front end of the first fixed part of the chair back support, and a slide groove cooperating with the slide rail is formed at the rear end of the lumbar support. The slide rail cooperates with the slide groove sliding guide, and a plurality of tooth-shaped grooves arranged along the height direction are formed on the surface of the slide rail. The slide groove is provided with latch teeth, and the height of the lumbar support on the first fixed part is locked by the latch teeth cooperating with the tooth-shaped grooves at different positions.

[0007] Preferably, the tooth-shaped slot is an arc-shaped slot, and the surface of the locking tooth protruding toward the tooth-shaped slot is an arc-shaped surface.

[0008] Preferably, the lumbar support comprises a pillow portion and a connecting portion, the connecting portion is fixed to the rear end of the pillow portion by bolts, and the latch teeth are interference fit with the connecting portion.

[0009] Preferably, the first fixing portion and the second fixing portion of the seat back bracket are integrally formed, and the seat back bracket is further provided with a reinforcing rib connecting the first fixing portion and the second fixing portion.

[0010] Due to the adoption of the above scheme, the chair back frame adopts a tubular structure, the front end of which is directly placed in the connecting groove of the chair back bracket, and the upper limit is provided by the seat, so the installation structure is simple and reliable; the lumbar support can be adjusted up and down to adapt to the height and body shape of different users, and the supporting effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of this application;

[0012] Figure 2 It is a schematic diagram of the installation structure of the seat back bracket and the seat back frame;

[0013] Figure 3 It is a cross-sectional view of the seat back bracket and the seat back frame.

[0014] Reference numerals:

[0015] The backrest bracket 1 , the first fixing portion 11 , the toothed slot 111 , the second fixing portion 12 , the reinforcing rib 13 , the backrest frame 2 , the connecting end 21 , the lumbar support 3 , the pillow portion 31 , and the connecting portion 32 . DETAILED DESCRIPTION

[0016] The embodiments of the present utility model are described in detail below.

[0017] like Figure 1-3 As shown, the utility model discloses a chair with a backrest, comprising a chair leg, a seat and a backrest, the backrest comprising a backrest bracket 1, a backrest frame 2 and a lumbar support 3, the backrest bracket 1 comprising a first fixing portion 11 and a second fixing portion 12, the first fixing portion 11 is arranged toward the height direction of the chair and is located at the rear side of the backrest frame 2, the lumbar support 3 can be adjusted up and down and fixed to the first fixing portion 11; the second fixing portion 12 extends toward the lower end of the seat and is fixed to the base; the backrest frame 2 is a tubular structure, and the lower end of the backrest frame 2 is bent forward to form a connecting end 21; the second fixing portion 12 of the backrest bracket 1 is provided with a connecting groove opening upward, the connecting end 21 of the backrest frame 2 is placed in the connecting groove, and after installation, the connecting end 21 of the backrest frame 2 is located between the second fixing portion 12 and the seat.

[0018] In this embodiment, the seat back support 1 can be made of a steel pipe structure, which is bent into a desired shape. The bending process is simple, and the steel pipe structure has sufficient strength. Figure 2 As shown, the backrest bracket 1 is L-shaped, the upper end surface of the second fixing portion 12 of the backrest bracket 1 is a plane, and a pair of connecting grooves arranged in opposition are provided in the front portion thereof, the size of the connecting grooves is adapted to the size of the connecting end 21 of the backrest frame 2, and the connecting end 21 of the backrest frame 2 is inserted into the connecting grooves to form a preliminary connection between the backrest bracket 1 and the backrest frame 2. The backrest bracket 1 is fixed to the seat at its second fixing portion 12, and after the backrest bracket 1 and the backrest frame 2 are integrally connected to the seat, the seat can close the upper opening of the connecting groove from above, providing an upper limit for the connecting end 21 of the backrest frame 2.

[0019] The first fixing portion 11 of the backrest bracket 1 is gradually widened from top to bottom, and the lower end of the first fixing portion 11 is connected to the second fixing portion 12, so that the width of the first fixing portion 11 at the connection with the second fixing portion 12 is large, which is conducive to enhancing the strength of the connection. Preferably, in this embodiment, the first fixing portion 11 and the second fixing portion 12 of the backrest bracket 1 are integrally formed, and the backrest bracket 1 is also provided with a reinforcing rib 13 connecting the first fixing portion 11 and the second fixing portion 12, which is conducive to further enhancing the overall strength of the connecting bracket.

[0020] The front end of the first fixing part 11 of the chair back support 1 forms a vertically arranged slide rail, and the rear end of the lumbar support 3 forms a slide groove that cooperates with the slide rail. The slide rail cooperates with the slide groove sliding guide, and the surface of the slide rail forms a plurality of tooth-shaped slots 111 arranged in the height direction. The slide groove is provided with latch teeth, and the height of the lumbar support 3 on the first fixing part 11 is locked by the latch teeth cooperating with the tooth-shaped slots 111 at different positions. When the height of the lumbar support 3 needs to be adjusted, it is only necessary to manually drive the lumbar support 3 to move up and down along the slide rail, and the height of the lumbar support 3 can be locked by the latch teeth cooperating with the tooth-shaped slots 111 of the corresponding height, which is convenient to operate.

[0021] Preferably, the toothed slot 111 is an arcuate slot, and the surface of the latching teeth protruding toward the toothed slot 111 is an arcuate surface, and the latching teeth can be conveniently driven to switch between different toothed slots 111 through the arcuate surface. In a preferred embodiment, the lumbar support 3 includes a pillow portion 31 and a connecting portion 32, and the connecting portion 32 is fixed to the rear end of the pillow portion 31 by bolts, and the latching teeth are interference fit with the connecting portion 32. In this way, the pillow portion 31, the connecting portion 32 and the latching teeth can be independently provided, and the processing is more convenient.

[0022] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A backrest chair, comprising a backrest, the backrest comprising a backrest bracket, a backrest frame and a lumbar support, characterized in that: The backrest bracket includes a first fixing part and a second fixing part, the first fixing part is arranged toward the height direction of the chair and is located at the rear side of the backrest frame, and the lumbar support can be adjusted up and down and fixed on the first fixing part; the second fixing part extends toward the lower end of the seat and is fixed on the base; the backrest frame is a tubular structure, and the lower end of the backrest frame is bent forward to form a connecting end; the second fixing part of the backrest bracket is provided with a connecting groove opening upward, and the connecting end of the backrest frame is placed in the connecting groove. After installation is completed, the connecting end of the backrest frame is located between the second fixing part and the seat.

2. The backrest chair according to claim 1, characterized in that: The seat back bracket is L-shaped, and the width of the first fixing portion of the seat back bracket gradually increases from top to bottom.

3. The backrest chair according to claim 1, characterized in that: A vertically arranged slide rail is formed at the front end of the first fixed part of the chair back support, and a slide groove cooperating with the slide rail is formed at the rear end of the lumbar support. The slide rail cooperates with the slide groove sliding guide, and a plurality of tooth-shaped grooves arranged along the height direction are formed on the surface of the slide rail. The slide groove is provided with latch teeth, and the height of the lumbar support on the first fixed part is locked by the latch teeth cooperating with the tooth-shaped grooves at different positions.

4. The backrest chair according to claim 3, characterized in that: The tooth-shaped slot is an arc-shaped slot, and the surface of the locking teeth protruding toward the tooth-shaped slot is an arc-shaped surface.

5. The backrest chair according to claim 3, characterized in that: The lumbar support comprises a pillow portion and a connecting portion, wherein the connecting portion is fixed to the rear end of the pillow portion by means of bolts, and the latch teeth are interference fit with the connecting portion.

6. The backrest chair according to claim 1, characterized in that: The first fixing portion and the second fixing portion of the seat back bracket are integrally formed, and a reinforcing rib connecting the first fixing portion and the second fixing portion is further provided on the seat back bracket.

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