Seat with self-adaptive chair back adjusting structure

Abstract

The utility model discloses a seat with a self-adaptive chair back adjusting structure. The seat comprises a seat main body, a chair back main body and a chair back adjusting module, the chair back adjusting module comprises a back chasing adjusting assembly and a locking assembly. The back-chasing adjusting assembly comprises a chair back mounting frame, an upper supporting arm, a lower supporting arm and a supporting bracket. The chair back mounting frame is used for mounting the chair back main body. And the supporting bracket is fixed on the chair seat main body and is parallel to the chair back mounting frame. And two ends of the upper support arm and the lower support arm which are parallel to each other are respectively hinged and matched with the chair back mounting frame and the support bracket. According to the utility model, the back-chasing adjusting assembly with the parallelogram structure is arranged between the chair seat main body and the chair back main body, so that when the back of a user applies an obliquely downward force to the chair back main body, the chair back main body can synchronously move along with the back of the user under the cooperation of the upper support arm and the lower support arm in the back-chasing adjusting assembly; and the situation that a gap between the chair back main body and the chair seat main body is increased due to overturning of the chair back main body and the supporting area for the back of a user is reduced is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of office furniture technology, specifically relating to a chair with an adaptive backrest adjustment structure. Background Technology

[0002] As people's living standards continue to improve, the pressure of daily work and study is also increasing, making sub-health a concern for many. When resting, existing office chairs allow users to recline and relax by flipping the backrest.

[0003] In existing technology, the backrest and seat of common office chairs on the market are fixed. When the user needs to recline, the backrest is flipped backward to achieve this. During the flipping process, the gap between the bottom of the backrest and the seat gradually increases with the change of tilt angle, leaving the user's spine and lumbar region partially unsupported. Prolonged lack of support for the lumbar and spine can lead to pressure or injury. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a seat with an adaptive backrest adjustment structure to solve the technical problem of insufficient support for the spine and lumbar region when the backrest is flipped.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] A seat with an adaptive backrest adjustment structure includes a seat body, a backrest body, and a backrest adjustment module. The backrest adjustment module includes a backrest adjustment component and a locking component.

[0007] The backrest adjustment assembly includes a backrest mounting bracket, an upper support arm, a lower support arm, and a support bracket. The backrest mounting bracket is used for mounting the backrest body. The support bracket is fixed to the seat body and is parallel to the backrest mounting bracket. The two ends of the parallel upper and lower support arms are hinged to the backrest mounting bracket and the support bracket, respectively.

[0008] The locking assembly is mounted on the support bracket and is used to lock or unlock the lower support arm after it has been flipped over.

[0009] Furthermore, the locking assembly includes a locking pin and a locking drive assembly. The support bracket includes a bracket body and connectors disposed on both sides of the bracket body; the connectors have clearance through holes that cooperate with the locking pin. The locking pin is slidably connected within the clearance through holes and can move outward or inward in the horizontal direction under the drive of the locking drive assembly. The lower support arm has locking holes that cooperate with the locking pin.

[0010] Furthermore, the locking drive assembly includes a transmission torsion spring and a control handle. A mounting post that mates with the transmission torsion spring is fixed to the support bracket. The transmission torsion spring is sleeved on the outer ring of the mounting post, and its inner end is connected to the control handle, allowing it to rotate under the drive of the control handle. The outer end of the transmission torsion spring is connected to a locking pin, enabling it to drive the locking pin to move inward or outward during rotation.

[0011] Furthermore, the inner ends of the upper and lower support arms are hinged to the connecting parts.

[0012] Furthermore, the connector has an inverted L-shaped structure, divided into a bottom support portion and a top limiting portion. A mounting through hole is provided on the limiting portion. A limiting rod is inserted into the mounting through hole. An arc-shaped limiting groove is provided on the upper support arm to mate with the limiting rod. The outer end of the limiting rod extends into the arc-shaped limiting groove.

[0013] Furthermore, the lower support arm consists of two parts, including a first support arm and a second support arm. The first support arm is divided into a lower connecting rod portion and an upper locking portion. A locking hole is formed on the locking portion. A locking groove is provided on the inner edge of the locking portion.

[0014] Furthermore, a limiting plate is fixed in the middle of the main body of the bracket. The limiting plate has a mounting slot that mates with a locking pin. The locking pin passes through the mounting slot and slides within it. The top of the transmission torsion spring is located on the side of the limiting plate away from the locking hole.

[0015] Furthermore, the chair back body and the chair back mounting frame are hinged together via a pivot. The bottom of the chair back mounting frame abuts against the chair back body. Multiple springs are provided between the chair back body and the chair back mounting frame.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention provides a backrest adjustment component with a parallelogram structure between the seat body and the backrest body. When the user's back applies a downward tilting force to the backrest body, the backrest body can move synchronously with the user's back with the cooperation of the upper and lower support arms in the backrest adjustment component. This avoids the increase in the gap between the backrest body and the seat body due to the flipping of the backrest body, which would reduce the support area for the user's back.

[0018] This invention provides a locking component on the backrest adjustment assembly to lock or unlock the backrest adjustment assembly after it has been flipped and adjusted, effectively preventing the backrest from shifting due to external force after it has been adjusted to its limit position. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram showing the relative positions of the backrest adjustment component and the main body of the chair seat in this utility model;

[0021] Figure 3 This is a schematic diagram of the back-mounted adjustment component in this utility model. Figure 2 (Enlarged view of part A in the middle)

[0022] Figure 4 This is a schematic diagram showing the relative positions of the chair back mounting bracket, upper support arm, lower support arm, and support bracket in this utility model.

[0023] Figure 5 This is a schematic diagram of the unlocked state of the locking component in this utility model;

[0024] Figure 6 This is a structural schematic diagram of the locking component in the locked state of this utility model.

[0025] Reference numerals in the attached drawings: 1. Seat body; 2. Backrest body; 3. Backrest adjustment module; 4. Backrest adjustment assembly; 5. Locking assembly; 5-1. Locking pin; 5-2. Transmission torsion spring; 5-3. Control handle; 6. Backrest mounting bracket; 7. Upper support arm; 8. Lower support arm; 8-1. Connecting rod; 8-2. Locking part; 8-3. Locking groove; 8-4. Locking hole; 9. Support bracket; 9-1. Bracket body; 9-2. Connector; 9-2-1. Support part; 9-2-2. Limiting part; 9-3. Mounting through hole; 10. Limiting plate; 11. Spring. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1 and 2As shown, a seat with an adaptive backrest adjustment structure includes a seat body 1, a backrest body 2, and a backrest adjustment module 3. The backrest adjustment module 3 includes a follow-up adjustment component 4 and a locking component 5. The backrest body 2 is mounted on the seat body 1 via a height adjustment component. The backrest body 2 can move synchronously with the user's back during tilting via the follow-up adjustment component 4. The locking component 5 is used to lock or unlock the backrest body 2 when it reaches its extreme position.

[0029] The specific structure is as follows: Figure 3 and 4 As shown, the backrest adjustment assembly 4 includes a backrest mounting bracket 6, an upper support arm 7, a lower support arm 8, and a support bracket 9. The backrest mounting bracket 6 is used for mounting the backrest body 2. The support bracket 9 is fixed to the seat body 1 and is parallel to the backrest mounting bracket 6. The two ends of the parallel upper support arm 7 and lower support arm 8 are hinged to the backrest mounting bracket 6 and the support bracket 9, respectively. The backrest mounting bracket 6, upper support arm 7, lower support arm 8, and support bracket 9 form a parallelogram structure that can move up and down. A locking assembly 5 is installed on the support bracket 9 and is used to lock or unlock the lower support arm 8 after it is flipped over.

[0030] During use, when the backrest adjustment component 4 is in the unlocked state, and the user's back applies a downward tilting force to the backrest body 2, the backrest body 2 can move synchronously with the user's back with the cooperation of the upper support arm 7 and the lower support arm 8, so as to avoid the increase in the gap between the backrest body 2 and the seat body 1 due to the flipping of the backrest body 2, and the reduction of the support area for the user's back.

[0031] Furthermore, such as Figure 4 As shown, the support bracket 9 includes a bracket body 9-1 and connectors 9-2 disposed on both sides of the bracket body 9-1. The connectors 9-2 have an inverted L-shaped structure, divided into a bottom support portion 9-2-1 and a top limiting portion 9-2-2. The limiting portion 9-2-2 has a mounting through hole 9-3. A limiting rod (not shown in the figure) is inserted into the mounting through hole 9-3. The upper support arm 7 has an arc-shaped limiting groove that mates with the limiting rod. The outer end of the limiting rod extends into the arc-shaped limiting groove. In use, when the upper support arm 7 flips upwards or downwards, the limit position of the upper support arm 7's flipping is limited by the cooperation between the limiting rod and the arc-shaped limiting groove.

[0032] like Figure 5 and 6As shown, the locking assembly 5 includes a locking pin 5-1 and a locking drive assembly. The connecting member 9-2 has a clearance through-hole in its center that mates with the locking pin 5-1. The locking pin 5-1 is slidably connected within the clearance through-hole and can move outward or inward horizontally under the drive of the locking drive assembly. The lower support arm 8 has a locking hole 8-4 that mates with the locking pin 5-1. When the locking pin 5-1 moves outward, it inserts into the locking hole 8-4 on the lower support arm 8, locking the movement of the lower support arm 8, and thus locking the overall position of the back-mounted adjustment assembly 4.

[0033] In this embodiment, the locking drive assembly includes a transmission torsion spring 5-2 and a control handle 5-3. A mounting post that mates with the transmission torsion spring 5-2 is fixed to the bracket body 9-1. The transmission torsion spring 5-2 is fitted onto the outer ring of the mounting post. The control handle 5-3 is rotatably connected to the bracket body 9-1 and has a slot that mates with the bottom of the transmission torsion spring 5-2. The bottom of the transmission torsion spring 5-2 is inserted into the slot, allowing it to rotate in the opposite direction when the control handle 5-3 rotates. The locking pin 5-1 has a hole that mates with the top of the transmission torsion spring 5-2. The top of the transmission torsion spring 5-2 is inserted into the hole. When the transmission torsion spring 5-2 rotates, it can move the locking pin 5-1 outwards or inwards, thereby locking or unlocking the lower support arm 8.

[0034] Furthermore, the lower support arm 8 consists of two parts: a first arm and a second arm. The first arm comprises a lower connecting rod portion 8-1 and an upper locking portion 8-2. A locking hole 8-4 is formed on the locking portion 8-2. A recessed locking groove 8-3 is provided on the inner edge of the locking portion 8-2. When the first arm is tilted downwards to its extreme position, the locking pin 5-1 extends outwards under the action of the transmission torsion spring 5-2 and abuts against the locking groove 8-3, thus locking the first arm in the upward tilting direction and preventing the chair back body 2 from shifting due to external force after being adjusted downwards to its extreme position.

[0035] Furthermore, a limiting plate 10 is fixed in the middle of the bracket body 9-1. A mounting slot is provided in the middle of the limiting plate 10 to mate with the locking pin 5-1. The locking pin 5-1 passes through the mounting slot and slides within it. The tip of the transmission torsion spring 5-2 is located on the side of the limiting plate 10 away from the locking hole 8-4, ensuring that the tip of the transmission torsion spring 5-2 is limited by the limiting plate 10 at its extreme position, preventing the tip of the transmission torsion spring 5-2 from disengaging from the locking pin 5-1 during movement.

[0036] In this embodiment, the chair back body 2 and the chair back mounting bracket 6 are hinged together via a pivot. The bottom of the chair back mounting bracket 6 abuts against the chair back body 2 to ensure that the chair back body 2 is perpendicular to the horizontal plane in its initial state. Multiple springs 11 are provided between the chair back body 2 and the chair back mounting bracket 6 to provide cushioning when the chair back body 2 tilts outward.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A seat with a chair back self-adapting adjustment structure, comprising a seat body (1), a chair back body (2) and a chair back adjustment module (3), characterized in that: The chair back adjusting module (3) comprises a backrest adjusting assembly (4) and a locking assembly (5); The backrest adjusting assembly (4) comprises a backrest mounting frame (6), an upper supporting arm (7), a lower supporting arm (8) and a supporting bracket (9); the backrest mounting frame (6) is used for mounting the backrest body (2); the supporting bracket (9) is fixed on the seat body (1) and is parallel to the backrest mounting frame (6); the upper supporting arm (7) and the lower supporting arm (8) are hingedly connected to the backrest mounting frame (6) and the supporting bracket (9) respectively. The locking assembly (5) is mounted on the supporting bracket (9) and is used for locking or unlocking the lower supporting arm (8) after being turned over.

2. The seat with the chair back self-adapting adjustment structure according to claim 1, characterized in that: The locking assembly (5) comprises a locking pin (5-1) and a locking driving assembly; the supporting bracket (9) comprises a bracket body (9-1) and connecting pieces (9-2) arranged on both side edges of the bracket body (9-1); the connecting pieces (9-2) are provided with through holes for the locking pin (5-1); the locking pin (5-1) is slidably connected in the through holes and can move outward or inward along the horizontal direction under the driving of the locking driving assembly; the lower supporting arm (8) is provided with a locking hole (8-4) matched with the locking pin (5-1).

3. The seat with the chair back self-adapting adjustment structure according to claim 2, characterized in that: The locking driving assembly comprises a transmission torsional spring (5-2) and a control handle (5-3); the supporting bracket (9) is fixed with a mounting column matched with the transmission torsional spring (5-2); the transmission torsional spring (5-2) is sleeved on the outer ring of the mounting column and is connected to the control handle at the inner end and can rotate under the driving of the control handle (5-3); the outer end of the transmission torsional spring (5-2) is connected to the locking pin (5-1) and can drive the locking pin (5-1) to move inward or outward when rotating.

4. The seat with the chair back self-adapting adjustment structure according to claim 3, characterized in that: The inner ends of the upper supporting arm (7) and the lower supporting arm (8) are hingedly connected to the connecting pieces (9-2).

5. The seat with the chair back self-adapting adjustment structure according to claim 4, characterized in that: The connecting pieces (9-2) are in inverted L-shaped structure and are divided into supporting portions (9-2-1) at the bottom and limiting portions (9-2-2) at the top; the limiting portions (9-2-2) are provided with mounting through holes (9-3); the limiting rods are inserted into the mounting through holes (9-3); the upper supporting arm (7) is provided with an arc-shaped limiting groove matched with the limiting rods; the outer ends of the limiting rods extend into the arc-shaped limiting groove.

6. The seat with the chair back self-adapting adjustment structure according to claim 1, characterized in that: The lower supporting arm (8) comprises a first arm and a second arm; the first arm comprises a connecting rod portion (8-1) at the lower side and a locking portion (8-2) at the upper side; the locking hole (8-4) is arranged on the locking portion (8-2); the locking portion (8-2) is provided with a locking groove (8-3) on the inner side edge.

7. The seat with the chair back self-adapting adjustment structure according to claim 4, characterized in that: The middle portion of the bracket body (9-1) is fixed with a limiting plate (10); the limiting plate (10) is provided with a mounting through slot matched with the locking pin (5-1); the locking pin (5-1) passes through the mounting through slot and is slidably connected to the mounting through slot; the top end of the transmission torsional spring (5-2) is located on the side of the limiting plate (10) away from the locking hole (8-4).

8. The seat with the chair back self-adapting adjustment structure according to claim 1, characterized in that: The chair back body (2) and the chair back mounting frame (6) are connected through a rotating shaft; the bottom of the chair back mounting frame (6) is in abutment with the chair back body (2); and a plurality of springs (11) are arranged between the chair back body (2) and the chair back mounting frame (6).

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