Office chair back structure capable of being adjusted to ascend and descend

Abstract

An office chair back structure capable of being adjusted to ascend and descend comprises a chair back frame, a chair back body, a fixing seat and a lifting seat, and the chair back body is arranged on the lifting seat; a lifting groove is formed in the back of the lifting seat, the fixed seat is arranged in the lifting groove, and the other end of the fixed seat extends out of the lifting groove and is connected with the chair back frame; a lifting groove is formed in the chair back frame, a height locking cavity is formed in the lifting groove, a plurality of height locking grooves are formed in the height locking cavity, a fixing groove is formed in the end, back on to the chair back frame, of the fixing seat, and a height locking mechanism matched with the height locking grooves to lock the height position of the lifting seat is arranged in the fixing groove. The height locking groove, the height locking mechanism and other structures are not exposed outside the office chair, so that the defects in the prior art are overcome, and the purpose of improving the attractiveness of the office chair is achieved; meanwhile, the height locking groove is formed in the height locking cavity in the back of the lifting seat, so that the height locking groove does not reduce the structural strength of the lifting seat too much, and the service life of the lifting seat is guaranteed.

Description

Technical Field

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

[0002] In the prior art, for the comfort of office chairs, the backrests are usually designed to be adjustable in height.

[0003] For example, a chair back height adjustment mechanism disclosed in Chinese patent publication number CN208875767U includes a tail plate and a slider connected to the chair back, the tail plate includes a latch seat and a base connected to the seat cushion, the latch seat and the base are integrally formed, a track is provided in the slider for the slider to slide up and down along the base, two rows of serrated gear grooves are provided on the base, a first gear lock tooth and a second gear lock tooth that can engage with the gear groove are freely hinged in the slider, the height adjustment of this patent is convenient, only need to pull the chair back upwards, the gear lock teeth will automatically engage with the gear groove of the corresponding height.

[0004] However, in this technical solution, since a moving space needs to be reserved between the base and the slider to allow the slider to slide up and down along the base, when the slider slides to the lowest gear slot position or the highest gear slot position, the slider usually cannot completely cover all the gear slots, resulting in at least part of the gear slots being exposed, affecting the appearance of the office chair; and in this patent, since the gear slots are arranged through the front and rear ends of the base, the strength of the position of the base corresponding to the gear slots is relatively weak. When the slider can completely cover all the gear slots, the slider can reinforce the position of the base corresponding to the gear slots, but when the slider usually cannot completely cover all the gear slots, after the user leans on the chair back and causes the base to be stressed, the position of the base corresponding to the gear slots is prone to the risk of breakage. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides an office chair back structure that is adjustable and liftable.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An adjustable liftable office chair backrest structure comprises a backrest frame and a backrest body; the feature is that it also comprises a fixed seat and a lift seat that can be lifted and moved relative to the fixed seat, the backrest body is arranged on the lift seat and is lifted and lowered along with the lift seat; the lift seat is provided with a lift groove on the back, the fixed seat is arranged in the lift groove, a limit block is installed in the lift groove, and the front side surface of the limit block and the stepped plane in the lift groove form a first lift guide groove;

[0008] A lifting guide block is provided on one end of the fixing seat for guiding the lifting in cooperation with the first lifting guide groove, and the other end extends out of the lifting groove and is connected to the chair back frame;

[0009] A height locking cavity is provided in the lifting groove, and a plurality of height locking grooves are arranged from top to bottom in the height locking cavity. A fixing groove is provided on one end of the fixed seat facing away from the chair back frame, and a height locking mechanism is provided in the fixing groove to extend into the height locking cavity and cooperate with the height locking groove to lock the height position of the lifting seat;

[0010] The chair back body includes a chair back frame and a lumbar support bracket, the chair back frame is adapted to be installed on a lifting seat; the lumbar support bracket is adapted to be installed on the chair back frame and moves with the chair back frame, the lumbar support bracket can be flipped and swung up and down relative to the chair back frame, and an elastic support mechanism is installed between the lumbar support bracket and the chair back frame to elastically support the lumbar support bracket to flip, swing and reset.

[0011] In the present invention, each of the height locking grooves includes two left-right symmetrical gear grooves, and the height locking mechanism includes a first locking member and a second locking member respectively inserted into the two gear grooves in the height locking cavity, and one end of the first locking member and one end of the second locking member are both rotatably installed in the fixed groove.

[0012] In the utility model, a locking spring for driving the first locking element and the second locking element to keep them inserted into the shift slot and an unlocking and holding structure for keeping them exiting the shift slot are provided between the first locking element and the second locking element.

[0013] In the utility model, the unlocking and holding structure includes an unlocking and holding slot and an unlocking and holding block that can be movably snap-fitted into the unlocking and holding slot to form a snap-fit, the unlocking and holding slot is arranged on the second locking piece, and the unlocking and holding block is arranged on the first locking piece.

[0014] In the utility model, the height locking cavity is provided with an unlocking guide groove for driving the first locking element and the second locking element to flip over and approach each other so that the unlocking holding card block is inserted into the unlocking holding card slot, and a locking guide block for driving the first locking element and the second locking element to flip over and unfold each other so that the unlocking holding card block is separated from the unlocking holding card slot.

[0015] In the utility model, two second lifting guide blocks are further provided on the end of the fixed seat facing away from the chair back frame, and two second lifting guide grooves are provided in the lifting groove, which are respectively located on both sides of the height locking cavity, and each of the second lifting guide grooves cooperates with the lifting guide of the second lifting guide block.

[0016] In the utility model, a hidden groove is provided on the back of the chair back frame, and a matching through hole is provided on the front of the chair back frame for matching bolts to connect the fixing seat. The matching through hole is connected to the hidden groove, so that the matching bolt can pass through the matching through hole in the hidden groove and connect with the fixing seat.

[0017] In the utility model, a decorative cover plate for covering the hidden groove is buckled on the chair back frame.

[0018] The beneficial effects of the utility model are as follows: the utility model is provided with a height locking groove and a height locking mechanism so that the chair back body can be raised and lowered to adjust the height, wherein the height locking groove is hidden in the lifting groove of the back of the lifting seat, and the height locking mechanism is hidden in the fixing groove of the fixing seat and extends into the height locking cavity and cooperates with the height locking groove, so that the height locking groove, the height locking mechanism and other structures are not exposed to the outside of the office chair, thereby solving the disadvantages of the prior art and achieving the purpose of improving the aesthetics of the office chair; at the same time, since the height locking groove is arranged in the height locking cavity of the back of the lifting seat, the height locking groove will not reduce the structural strength of the lifting seat itself too much, thereby ensuring the service life of the lifting seat; in addition, the two limit blocks are respectively located on the left and right sides of the height locking cavity, which provide support for the lifting seat, enhance the structural stability of the position where the height locking groove is set on the lifting seat, and ensure the service life of the lifting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 is a three-dimensional diagram of this embodiment;

[0021] Figure 2 Explosion for seat back frame and lift seat Figure 1 ;

[0022] Figure 3 Explosion for seat back frame and lift seat Figure 2 ;

[0023] Figure 4 It is a schematic diagram of the installation of the height locking mechanism on the fixed seat;

[0024] Figure 5 It is a schematic diagram of the height locking mechanism being matched in the height locking slot;

[0025] Figure 6 is a cross-sectional view of this embodiment;

[0026] Figure 7 for Figure 6 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0028] Reference Figure 1-7 A liftable office chair back structure includes a back frame 1, a back body, a fixed seat 2, and a lift seat 3 that can be lifted and moved relative to the fixed seat 2. The back body is arranged on the lift seat 3 and rises and falls with the lift seat 3.

[0029] Furthermore, a lifting groove 31 is provided on the back of the lifting seat 3, the fixed seat 2 is arranged in the lifting groove 31, and two limit blocks 4 for limiting the fixed seat 2 from exiting the lifting groove 31 are installed in the lifting groove 31, and the limit blocks 4 are connected to the lifting seat 3 by bolt connection, and the front side surface of each limit block 4 and a stepped plane 311 in the lifting groove 31 form a first lifting guide groove; a lifting guide block 21 cooperating with the first lifting guide groove for lifting and guiding is provided on one end of the fixed seat 2, and the other end of the fixed seat 2 extends out of the lifting groove 31 and is fixedly connected to the chair back frame 1;

[0030] Furthermore, a height locking cavity 32 is provided in the lifting groove 31, and the opening of the height locking cavity 32 is arranged to face backward. A plurality of height locking grooves 33 distributed from top to bottom are provided in the height locking cavity 32. A fixing groove 22 is provided on the end of the fixed seat 2 facing away from the chair back frame 1. A height locking mechanism is provided in the fixing groove 22, which extends into the height locking cavity 32 and cooperates with the height locking groove 33 to lock the height position of the lifting seat 3.

[0031] The utility model is provided with a height locking groove 33 and a height locking mechanism so that the chair back body can be raised and lowered to adjust the height, wherein the height locking groove 33 is hidden in the lifting groove 31 on the back of the lifting seat 3, and the height locking mechanism is hidden in the fixing groove 22 of the fixing seat 2 and extends into the height locking cavity 32 and cooperates with the height locking groove 33, so that the height locking groove 33, the height locking mechanism and other structures are not exposed outside the office chair, thereby solving the disadvantages of the prior art and achieving the purpose of improving the aesthetics of the office chair; at the same time, since the height locking groove 33 is arranged in the height locking cavity 32 on the back of the lifting seat 3, the height locking groove 33 does not penetrate the lifting seat 3 forward, so that the height locking groove 33 will not reduce the structural strength of the lifting seat 3 itself too much, thereby ensuring the service life of the lifting seat 3; in addition, the two limit blocks 4 are respectively located on the left and right sides of the height locking cavity 32, so that the lifting seat 3 can be guided to connect to the fixing seat 2 while providing support for the lifting seat 3, thereby enhancing the structural stability of the position where the height locking groove 33 is set on the lifting seat 3, and ensuring the service life of the lifting seat 3.

[0032] As a preferred embodiment, each of the height locking grooves 33 includes two left-right symmetrical gear grooves 331, and the gear grooves 331 are tilted downward. The height locking mechanism includes a first locking member 5 and a second locking member 6, which are used to be respectively inserted into and matched with the two gear grooves 331 respectively inserted into the same height locking groove 33 to achieve locking of the height position of the lifting seat 3. One end of the first locking member 5 and one end of the second locking member 6 are rotatably installed in the fixed groove 22 using the same locking hinge shaft. The front ends of the first locking member 5 and the second locking member 6 are both extended into the height locking cavity 32. A locking spring 7 for driving them to remain inserted into the gear groove 331 and an unlocking and holding structure for keeping them exiting the gear groove 331 are provided between the first locking member 5 and the second locking member 6.

[0033] In this embodiment, spring positioning grooves are provided on the first locking member 5 and the second locking member 6, and the two ends of the locking spring 7 are respectively inserted into the two spring positioning grooves to prevent the locking spring 7 from shifting and affecting the normal use of the locking spring 7. The other end of the first locking member 5 and the other end of the second locking member 6 are relatively flipped and unfolded under the elastic force of the locking spring 7, so as to respectively maintain the state of being inserted into the gear groove 331 of the same height locking groove 33, thereby realizing the locking of the height of the lifting seat 3 and the chair back body.

[0034] In this embodiment, the unlocking and holding structure includes an unlocking and holding slot 61, an unlocking and holding block 51 that can be movably snap-fitted in the unlocking and holding slot 61 to form a snap-fit, the unlocking and holding slot 61 is arranged on the second lock member 6, and the unlocking and holding block 51 is arranged on the first lock member 5; the height locking cavity 32 is provided with an unlocking guide groove 321 that drives the first lock member 5 and the second lock member 6 to flip and approach each other so that the unlocking and holding block 51 is snapped into the unlocking and holding slot 61, and a locking guide block 322 that drives the first lock member 5 and the second lock member 6 to flip and unfold each other so that the unlocking and holding block 51 is separated from the unlocking and holding slot 61. When the lifting seat 3 is in the state of being lifted up, the first locking member 5 and the second locking member 6 are in the state of being locked in the unlocking guide groove 321, and the locking spring 7 can drive the first locking member 5 and the second locking member 6 to be locked in the corresponding gear groove 331 again, thereby realizing the height locking of the lifting seat 3.

[0035] As a preferred embodiment, in order to further improve the lifting and lowering guiding cooperation effect between the lifting seat 3 and the fixed seat 2, two second lifting guide blocks 23 are further provided on the end of the fixed seat 2 facing away from the chair back frame 1, and two second lifting guide grooves are provided in the lifting groove 31, which are respectively located on both sides of the height locking cavity 32, and each of the second lifting guide grooves is lifted and guided by the second lifting guide block 23.

[0036] As a preferred embodiment, a hidden groove 11 is provided on the back of the chair back frame 1, and a matching through hole 12 for matching bolts to connect the fixing seat 2 is provided on the front of the chair back frame 1. The matching through hole 12 is connected to the hidden groove 11, so that the matching bolt can pass through the matching through hole 12 in the hidden groove 11 and connect with the fixing seat 2; then a decorative cover plate 13 for covering the hidden groove 11 is buckled on the chair back frame 1, thereby covering the matching bolts and the hidden groove 11, improving the appearance of the office chair, and also reducing the risk of the matching bolts being exposed and rusting.

[0037] As a preferred embodiment, the chair back body includes a chair back frame 8 and a lumbar support bracket 9, the chair back frame 8 is adapted to be installed on the lifting seat 3, and the lumbar support bracket 9 is adapted to be installed on the chair back frame 8 and moves with the lifting of the lifting seat 3. The lumbar support bracket 9 can be flipped and swung up and down relative to the chair back frame 8, and an elastic support mechanism is installed between the lumbar support bracket 9 and the chair back frame 1 to elastically support the lumbar support bracket 9 to flip, swing and reset.

[0038] As a preferred embodiment, the elastic support mechanism includes a support mounting seat 10 and a support spring 20. The support mounting seat 10 is adapted to be installed on the lifting seat 3. The support mounting seat 10 is rotatably connected to the lumbar support bracket 9. The two ends of the support spring 20 are respectively adapted to be connected to the support mounting seat 10 and the lumbar support bracket 9. When the user presses the lumbar support bracket 9, the lumbar support bracket 9 compresses the support spring 20 backwards. The support spring 20 provides a reaction force to elastically support the lumbar support bracket 9, thereby providing the user with active lumbar support.

[0039] As a preferred embodiment, the elastic support mechanism also includes a support limit member 30 for limiting the swing stroke of the lumbar support bracket 9, one end of the support limit member 30 is adapted on the lumbar support bracket 9, and the other end is adapted on the support mounting seat 10; the support limit member 30 adopts a support limit bolt, and the support mounting seat 10 is provided with a movable through hole that allows the support limit bolt to move relative to the support limit bolt, and the screw end of the support limit bolt passes through the movable through hole and the inner circle of the support spring 20 in turn and is connected with the connecting screw hole on the lumbar support bracket 9, so that the support limit member 30 is installed on the lumbar support bracket 9 and cooperates with the support mounting seat 10 to achieve the purpose of limiting the stroke of the lumbar support bracket 9.

[0040] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. An adjustable liftable office chair back structure, comprising a back frame (1) and a back body; characterized in that: It also comprises a fixed seat (2) and a lifting seat (3) which can be lifted and moved relative to the fixed seat (2); the chair back is arranged on the lifting seat (3) and is lifted and lowered along with the lifting seat (3); a lifting groove (31) is arranged on the back of the lifting seat (3); the fixed seat (2) is arranged in the lifting groove (31); a limit block (4) is installed in the lifting groove (31); the front side surface of the limit block (4) and the stepped plane (311) in the lifting groove (31) form a first lifting guide groove; A lifting guide block (21) is provided on one end of the fixing seat (2) and cooperates with the first lifting guide groove to guide lifting, and the other end extends out of the lifting groove (31) and is connected to the chair back frame (1); A height locking cavity (32) is provided in the lifting groove (31), and a plurality of height locking grooves (33) arranged from top to bottom are provided in the height locking cavity (32); a fixing groove (22) is provided on one end of the fixed seat (2) facing away from the chair back frame (1), and a height locking mechanism is provided in the fixing groove (22) and extends into the height locking cavity (32) and cooperates with the height locking groove (33) to lock the height position of the lifting seat (3); The chair back body comprises a chair back frame (8) and a lumbar support bracket (9); the chair back frame (8) is adapted to be mounted on the lifting seat (3); the lumbar support bracket (9) is adapted to be mounted on the chair back frame (8) and moves with the chair back frame (8); the lumbar support bracket (9) can be turned up and down and swung relative to the chair back frame (8); an elastic support mechanism is installed between the lumbar support bracket (9) and the chair back frame (1) for elastically supporting the lumbar support bracket (9) to turn, swing and reset.

2. The adjustable liftable office chair back structure according to claim 1, characterized in that: Each of the height locking grooves (33) comprises two left-right symmetrical gear slots (331), and the height locking mechanism comprises a first locking member (5) and a second locking member (6) respectively inserted into the two gear slots (331) in the height locking cavity (32), and one end of the first locking member (5) and one end of the second locking member (6) are both rotatably mounted in the fixed groove (22).

3. The adjustable liftable office chair back structure according to claim 2, characterized in that: A locking spring (7) for driving the first locking element (5) and the second locking element (6) to maintain a state of being inserted into the gear slot (331) and an unlocking and retaining structure for maintaining a state of being withdrawn from the gear slot (331) are provided between the first locking element (5) and the second locking element (6).

4. The adjustable liftable office chair backrest structure according to claim 3, characterized in that: The unlocking and holding structure comprises an unlocking and holding slot (61) and an unlocking and holding block (51) that can be movably snap-fitted into the unlocking and holding slot (61) to form a snap-fit, the unlocking and holding slot (61) being provided on the second locking element (6), and the unlocking and holding block (51) being provided on the first locking element (5).

5. The adjustable liftable office chair back structure according to claim 4, characterized in that: The height locking cavity (32) is provided with an unlocking guide groove (321) for driving the first locking element (5) and the second locking element (6) to flip over and approach each other so that the unlocking and holding card block (51) is inserted into the unlocking and holding card groove (61), and a locking guide block (322) for driving the first locking element (5) and the second locking element (6) to flip over and unfold each other so that the unlocking and holding card block (51) is separated from the unlocking and holding card groove (61).

6. The adjustable liftable office chair backrest structure according to claim 1, characterized in that: Two second lifting guide blocks (23) are also provided on one end of the fixed seat (2) facing away from the chair back frame (1), and two second lifting guide grooves are respectively provided in the lifting groove (31) and are located on both sides of the height locking cavity (32), and each of the second lifting guide grooves cooperates with the second lifting guide block (23) for lifting and lowering.

7. The adjustable liftable office chair backrest structure according to claim 1, characterized in that: The back of the chair back frame (1) is provided with a hidden groove (11), and the front of the chair back frame (1) is provided with a matching through hole (12) for matching with a bolt to connect the fixing seat (2), and the matching through hole (12) is connected to the hidden groove (11), so that the matching bolt can pass through the matching through hole (12) in the hidden groove (11) and connect with the fixing seat (2).

8. The adjustable liftable office chair backrest structure according to claim 7, characterized in that: The chair back frame (1) is buckled with a decorative cover plate (13) for covering the hidden groove (11).

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