Swivel chair lumbar support adjustment mechanism

Abstract

The utility model belongs to office furniture technical field, concretely relates to a swivel chair waist backrest adjusting mechanism, including fixed module and the linear sliding of fixed module relative sliding module, the cavity in sliding module is rotationally arranged with rotation locking piece, the radial side of rotation locking piece is clamped and is pushed away on the positioning piece of fixed module by elastic force, makes a part of positioning piece from sliding module stretches out and keeps in the locking clamping groove of fixed module. The radial face of different diameter size is abutted to the positioning piece when rotating in the sliding module, and the positioning piece changes the distance relative to the fixed module, makes the positioning piece can from the locking clamping groove switch lock and unlock state. Simultaneously under the positioning piece locking state, the interaction force of rotation locking piece and positioning piece passes through the rotation axis of rotation locking piece, in this state, rotation locking piece does not rotate because of eccentric force, thereby can stably resist the positioning piece and insert the bolt in the locking clamping groove.

Description

Technical Field

[0001] This utility model belongs to the field of office furniture technology, specifically relating to a swivel chair lumbar support adjustment mechanism. Background Technology

[0002] Chairs are widely used in our daily lives, whether for work, study, or rest. To improve seating comfort, lumbar supports with a certain degree of elasticity are provided at the lumbar position to support the lower back.

[0003] A lifting mechanism and seat are disclosed in patent CN222486728U. The lifting mechanism includes a bracket, a lifting seat that is lifted and lowered on the bracket, and an operating lever that is rotatably mounted on the lifting seat. The lifting seat and the bracket are locked or unlocked by a locking member and a locking part. The operating lever controls the connection or separation of the locking member and the locking part by controlling the swinging of a swinging member. Since the operating lever is directly mounted on the lifting seat, when the operating lever unlocks the lifting seat from the bracket, the user can directly adjust the height of the lifting seat by adjusting the height of the operating lever. Therefore, unlocking and adjusting the height by operating the operating lever can be done in one step and can be completed with one hand. The operation is simple and convenient. The seat includes a lumbar support, armrests, and the lifting mechanism described above. The lumbar support and armrests are both mounted on the lifting seat and rise and fall on the bracket with the movement of the lifting seat. The lifting mechanism can realize the lifting and lowering movements of the lumbar support and armrests simultaneously, allowing the lumbar support and armrests to be adjusted together during the lifting and lowering adjustment.

[0004] In the above solution, although the user can adjust the height of the lifting seat by directly adjusting the height of the operating lever when the operating lever unlocks the lifting seat from the bracket, the locking part only has a spring to increase resistance when locked and lacks an effective limiting method. When the locking part is accidentally touched or the locking part is loosened due to the backrest swaying, the backrest will instantly lose support and cause an accident. Summary of the Invention

[0005] The purpose of this utility model is to address the above-mentioned problems by providing a swivel chair lumbar support adjustment mechanism that can solve the aforementioned technical issues.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The swivel chair lumbar support adjustment mechanism includes a fixed module and a sliding module that slides linearly relative to the fixed module. A rotary locking member is rotatably disposed in the cavity of the sliding module. The radial surface of the rotary locking member abuts against a positioning member that is pushed away from the fixed module by an elastic force, so that a part of the positioning member extends out of the sliding module and is held in the locking groove of the fixed module.

[0007] In the swivel chair lumbar support adjustment mechanism, at least one locking abutment surface is provided on the radial surface of the rotating locking member around the axis, which abuts against the positioning member, and the positioning member moves radially around the rotation axis of the rotating locking member.

[0008] In the swivel chair lumbar support adjustment mechanism, an unlocking abutment surface is also provided on the radial surface of the rotating locking member. When the unlocking abutment surface abuts against the positioning member, the positioning member exits from the locking slot.

[0009] In the swivel chair lumbar support adjustment mechanism, the locking abutment surface and the unlocking abutment surface are two planes that form an angle with each other, and a rounded corner is provided between the locking abutment surface and the unlocking abutment surface for connection and transition.

[0010] In the swivel chair lumbar support adjustment mechanism, when the rounded corner surface abuts against the positioning member, a portion of the positioning member remains in the locking slot.

[0011] In the swivel chair lumbar support adjustment mechanism, a positioning groove is provided in the sliding module. The positioning member slides in the positioning groove in a direction perpendicular to the moving direction of the sliding module. A reset elastic member is also provided between the bottom of the positioning groove and the positioning member, so that the positioning member abuts against the rotation locking member.

[0012] In the swivel chair lumbar support adjustment mechanism, the bottom of the positioning slide groove is provided with a positioning hole that cooperates with the locking tongue of the positioning member, and the positioning hole is located in the radial direction of the axis of the rotating locking member.

[0013] In the swivel chair lumbar support adjustment mechanism, a limiting protrusion is eccentrically provided on the axial end face of the rotating locking member, and the limiting protrusion abuts against the groove of the positioning slide as the rotating locking member rotates.

[0014] In the swivel chair lumbar support adjustment mechanism, a rotatable adjustment shaft passes through the sliding module, and the adjustment shaft passes through the rotation axis of the rotation locking member.

[0015] In the swivel chair lumbar support adjustment mechanism, the sliding module has a positioning protrusion arranged around the adjustment shaft, and the adjustment shaft is provided with a positioning slot that engages with the positioning protrusion when the positioning member extends into the locking slot.

[0016] The advantages of this utility model are: The rotary locking element, similar to a cam, rotates within the sliding module. Its radial surfaces of varying diameters abut against the positioning element, causing the positioning element to change its distance from the fixed module. This allows the positioning element to move in and out of the locking slot, switching between locked and unlocked states. Simultaneously, in the locked state, the interaction force between the rotary locking element and the positioning element passes through the rotation axis of the rotary locking element. In this state, the rotary locking element will not rotate due to eccentric force, thus stably holding the positioning element in place within the locking slot. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the rotating locking component of this utility model.

[0020] Figure 4 This is a schematic diagram of the sliding module structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the adjusting shaft structure of this utility model.

[0022] In the diagram, there are: fixed module 1, locking slot 11, sliding module 2, positioning slide 21, positioning hole 22, positioning protrusion 23, rotating locking component 3, locking abutment surface 31, unlocking abutment surface 32, rounded corner surface 33, limiting protrusion 34, adjusting shaft 35, positioning slot 36, positioning component 4, and locking tongue 41. Detailed Implementation

[0023] The following are specific embodiments of the utility model, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the utility model. However, the utility model is not limited to these embodiments.

[0024] like Figures 1-5 As shown, the swivel chair lumbar support adjustment mechanism includes a fixed module 1 and a sliding module 2 that slides linearly relative to the fixed module 1. A rotating locking member 3 is rotatably disposed in the cavity inside the sliding module 2. The radial surface of the rotating locking member 3 abuts against the positioning member 4 that is pushed away from the fixed module 1 by the elastic force, so that a part of the positioning member 4 extends out from the sliding module 2 and is held in the locking slot 11 of the fixed module 1.

[0025] That is, the rotary locking element, similar to a cam, rotates within the sliding module, with radial surfaces of different diameters abutting against the positioning element. This causes the positioning element to change its distance relative to the fixed module, allowing it to move in and out of the locking slot to switch between locked and unlocked states. Simultaneously, in the locked state, the interaction force between the rotary locking element and the positioning element passes through the rotation axis of the rotary locking element. In this state, the rotary locking element will not rotate due to eccentric force, thus stably holding the positioning element in place within the locking slot.

[0026] In this embodiment, at least one locking abutment surface 31 is provided on the radial surface of the rotating locking member 3 around the axis, which abuts against the positioning member 4, and the positioning member 4 moves radially around the rotation axis of the rotating locking member 3.

[0027] The locking abutment surface 31 is one of the planes on the radial surface of the rotary locking member 3. It can form a stable abutment with the positioning member 4, and the force between the two coincides with the radius line of the rotary locking member 3 starting from the axis. Therefore, the force between the two will not cause the rotary locking member 3 to rotate around the axis. That is, the locking abutment surface 31 and the positioning member 4 form a self-limiting locking state that requires circumferential external force to unlock.

[0028] In this embodiment, an unlocking abutment surface 32 is also provided on the radial surface of the rotating locking member 3. When the unlocking abutment surface 32 abuts against the positioning member 4, the positioning member 4 exits from the locking slot 11.

[0029] The unlocking abutment surface 32 is another plane on the radial surface of the rotating locking member 3. It is shorter than the locking abutment surface 31 from the axis of the rotating locking member 3. Therefore, when it abuts against the positioning member 4, the front end of the locking tongue 41 is still in the positioning hole 22, that is, the fixed module 1 and the sliding module 2 can still move relative to each other.

[0030] In this embodiment, the locking abutment surface 31 and the unlocking abutment surface 32 are two planes that form an angle with each other, and a rounded corner surface 33 is provided between the locking abutment surface 31 and the unlocking abutment surface 32 for connection and transition.

[0031] With only one locking contact surface 31 and one unlocking contact surface 32, the angle between them is set to 90° perpendicularly. For users, controlling the locking and unlocking by rotating 90° is more intuitive and less prone to accidental operation.

[0032] The radius of the rounded corner surface 33 is equal to the length of the locking abutment surface 31 from the rotation axis. Therefore, during the locking process, the rounded corner surface 33 pushes out the positioning member 4 in advance to lock. Then, the locking abutment surface 31 of the plane contacts the positioning member 4 and enters a self-limiting state, making the locking process smoother and more stable.

[0033] In this embodiment, when the rounded corner surface 33 abuts against the positioning member 4, a portion of the positioning member 4 is still in the locking slot 11.

[0034] During the unlocking process, the circumferential external force rotates away from the locking abutment surface 31, while the rounded corner surface 33 keeps the positioning part 4 in the locking slot 11 and maintains the locked state. This can prevent the accidental operation of the partially rotated locking part 3, which could cause the lumbar support to suddenly unlock and fall, thus ensuring the safety of the user.

[0035] In this embodiment, a positioning groove 21 is provided in the sliding module 2, and the positioning member 4 slides in the positioning groove 21 in a direction perpendicular to the moving direction of the sliding module 2. A reset elastic member is also provided between the bottom of the positioning groove 21 and the positioning member 4, so that the positioning member 4 abuts against the rotating locking member 3.

[0036] The positioning groove 21 establishes a channel for movement perpendicular to the fixed module 1. At the same time, a spring or spring sheet is set at the bottom of the groove to support the positioning member 4 to move away from the fixed module 1, so that the positioning member 4 is always unlocked when no external force is applied. At the same time, the positioning member 4 can abut against the rotating locking member 3, so that the rotating locking member 3 has a certain damping when rotating, preventing the adjusting shaft 35 from being accidentally touched.

[0037] In this embodiment, the bottom of the positioning groove 21 is provided with a positioning hole 22 that cooperates with the locking tongue 41 of the positioning member 4. The positioning hole 22 is located in the radial direction of the axis of the rotating locking member 3.

[0038] The depth direction of the positioning hole 22 also coincides with the radial direction of the axis of the rotary locking member 3. Its hole wall can serve as a track to guide the extension and retraction of the locking tongue 41, further ensuring that the rotary locking member 3 will not rotate due to the force of the positioning member 4 deviating from the axis. In addition, the hole wall will also serve as another fulcrum when the locking tongue 41 is in the restricted position during locking, thereby enhancing the stability after locking.

[0039] In this embodiment, a limiting protrusion 34 is eccentrically provided on the axial end face of the rotary locking member 3. The limiting protrusion 34 abuts against the groove of the positioning slide groove 21 as the rotary locking member 3 rotates.

[0040] The limiting protrusion 34 is a rotation angle limiting structure for the rotary locking member 3, ensuring that the rotary locking member 3 can only rotate within a set angle range. For example, if the limiting protrusion 34 is located on the side of the unlocking abutment surface 32 away from the locking abutment surface 31, when the rotary locking member 3 is locked and rotated in the opposite direction by the user, the limiting protrusion 34 is blocked by the groove of the positioning slide 21, allowing the operator to understand the correct rotation direction of the rotary locking member 3.

[0041] In addition, limit protrusions 34 can be set at each of the two ends of the maximum rotation stroke of the rotary locking component 3 so that the operator can know whether the locking and unlocking are in place.

[0042] In this embodiment, a rotatable adjustment shaft 35 passes through the sliding module 2, and the adjustment shaft 35 passes through the rotation axis of the rotation locking member 3.

[0043] The adjusting shaft 35 is inserted laterally into the sliding module 2 and extends outward at one end. The far end is also fitted with a handle for the user to rotate. The handle has a radially extending lever. The length of the lever is greater than the maximum diameter of the rotating locking member 3, so that the operator can make adjustments more easily by lever.

[0044] In this embodiment, the sliding module 2 has a positioning protrusion 23 arranged around the adjustment shaft 35, and the adjustment shaft 35 is provided with a positioning slot 36 that engages with the positioning protrusion 23 when the positioning member 4 extends into the locking slot 11.

[0045] A hemispherical positioning groove 36 with an opening facing the sliding module 2 is provided on the adjusting shaft 35 outside the sliding module 2. The positioning groove 36 corresponds to the locking abutment surface 31 and the unlocking abutment surface 32 of the rotary locking member 3. The sliding module 2 has a hemispherical positioning protrusion 23. When the adjusting shaft 35 is rotated to the locked position or the unlocked position, the positioning protrusion 23 will be engaged with the corresponding positioning groove 36, further improving the stability of the rotary locking member 3 in the state position.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A swivel chair lumbar support adjustment mechanism, comprising a fixed module (1) and a sliding module (2) that slides linearly relative to the fixed module (1), characterized in that, A rotating locking member (3) is rotatably disposed in the cavity inside the sliding module (2). The radial surface of the rotating locking member (3) abuts against the positioning member (4) that is pushed away from the fixed module (1) by the elastic force, so that a part of the positioning member (4) extends out from the sliding module (2) and is held in the locking slot (11) of the fixed module (1).

2. The swivel chair lumbar support adjustment mechanism according to claim 1, characterized in that, At least one locking abutment surface (31) is provided on the radial surface of the rotating locking member (3) around the axis, which abuts against the positioning member (4), and the positioning member (4) moves radially about the rotation axis of the rotating locking member (3).

3. The swivel chair lumbar support adjustment mechanism according to claim 2, characterized in that, The radial surface of the rotating locking member (3) is also provided with an unlocking abutment surface (32). When the unlocking abutment surface (32) abuts against the positioning member (4), the positioning member (4) exits from the locking slot (11).

4. The swivel chair lumbar support adjustment mechanism according to claim 3, characterized in that, The locking abutment surface (31) and the unlocking abutment surface (32) are two planes that form an angle with each other, and a rounded corner surface (33) is provided between the locking abutment surface (31) and the unlocking abutment surface (32) to connect and transition.

5. The swivel chair lumbar support adjustment mechanism according to claim 4, characterized in that, When the rounded corner surface (33) abuts against the positioning member (4), a portion of the positioning member (4) remains in the locking slot (11).

6. The swivel chair lumbar support adjustment mechanism according to claim 1, characterized in that, The sliding module (2) is provided with a positioning groove (21). The positioning member (4) slides in the positioning groove (21) in a direction perpendicular to the moving direction of the sliding module (2). A reset elastic member is also provided between the bottom of the positioning groove (21) and the positioning member (4) so ​​that the positioning member (4) abuts against the rotating locking member (3).

7. The swivel chair lumbar support adjustment mechanism according to claim 6, characterized in that, The bottom of the positioning groove (21) is provided with a positioning hole (22) that cooperates with the locking tongue (41) of the positioning member (4). The positioning hole (22) is located in the radial direction of the axis of the rotating locking member (3).

8. The swivel chair lumbar support adjustment mechanism according to claim 6, characterized in that, The axial end face of the rotary locking member (3) is provided with a limiting protrusion (34), which abuts against the opening of the positioning slide groove (21) as the rotary locking member (3) rotates.

9. The swivel chair lumbar support adjustment mechanism according to claim 1, characterized in that, The sliding module (2) has a rotatable adjustment shaft (35) that passes through it, and the adjustment shaft (35) is located at the rotation axis of the rotation locking member (3).

10. The swivel chair lumbar support adjustment mechanism according to claim 9, characterized in that, The sliding module (2) has a positioning protrusion (23) arranged around the adjustment shaft (35), and the adjustment shaft (35) is provided with a positioning slot (36) that engages with the positioning protrusion (23) when the positioning member (4) extends into the locking slot (11).

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