armrests and seats

Abstract

This utility model relates to an armrest and seat, including a fixed base and an armrest body connected to the fixed base via a rotation angle limiting mechanism. The rotation angle limiting mechanism includes a through hole on the armrest body, a shaft portion inserted into the through hole on the fixed base, and an axial limiting structure between the shaft portion and the through hole to prevent axial movement of the armrest body relative to the shaft portion. The axial limiting structure includes a fastener, at least a portion, and a remaining portion. The at least portion conforms to the outer periphery of one end of the through hole, and the remaining portion conforms to the outer periphery of the other end of the through hole. The remaining portion acts as rotational damping. The fastener passes through the at least portion and is at least connected to the shaft portion. The advantages are: it provides stable axial clamping, significantly improving structural stability and reliability; simultaneously, the elastic damping element ensures that the armrest body can remain stably stationary at any angle, overcoming the defects of armrest loosening and damping failure in the prior art.

Description

Technical Field

[0001] This application belongs to the field of office furniture, and in particular relates to an armrest and a chair. Background Technology

[0002] In existing technologies, when seat armrests are used for a long time or subjected to external forces, such as when the user's arm presses down or applies lateral force, they are prone to axial movement or wobbling along the rotation axis. This results in poor overall connection stability of the armrest, unstable support for the user's arm, and reduced comfort. For structures that rely on axial preload to achieve rotational damping, the movement will weaken or destroy the damping effect, making it impossible for the armrest to stay stably at the set angle, requiring frequent adjustments by the user. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned problems by providing an armrest and seat that can solve the aforementioned technical issues.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An armrest includes a fixed base and an armrest body connected to the fixed base by a rotation angle limiting mechanism. The rotation angle limiting mechanism includes a through hole on the armrest body, a shaft portion inserted into the through hole on the fixed base, and an axial limiting structure between the shaft portion and the through hole to prevent axial movement of the armrest body relative to the shaft portion. The axial limiting structure includes a fastener, at least a portion, and a remaining portion. The at least portion conforms to the outer peripheral surface of one end of the through hole, and the remaining portion conforms to the outer peripheral surface of the other end of the through hole. The remaining portion is made of an elastic material and acts as rotation damping. The fastener passes through the at least portion and is connected to at least the shaft portion, and the fastener is threadedly connected to at least the shaft portion.

[0006] Furthermore, the fixed base has an annular receiving groove at one end where the shaft portion is located, and the remaining portion is an annular damping ring, the annular damping ring being installed in the annular receiving groove and the groove depth being less than the thickness of the annular damping ring.

[0007] Furthermore, the at least part is an annular retaining ring, and a circumferential limiting structure is provided between the annular retaining ring and the shaft portion, the circumferential limiting structure being used to keep the annular retaining ring stationary relative to the handrail body.

[0008] Furthermore, the circumferential limiting structure includes a circumferential limiting protrusion and a circumferential limiting groove, one of which is disposed on the annular retaining ring, and the other is disposed on the shaft portion, and the circumferential limiting protrusion is inserted into the circumferential limiting groove.

[0009] Furthermore, an annular portion with the through hole is provided inside the armrest body, at least partially conforming to one end face of the annular portion, and the annular damping ring contacting the other end face of the annular portion.

[0010] Furthermore, the surface area of ​​the annular damping ring that contacts the other end face of the annular portion is smaller than the surface area of ​​the other end face of the annular portion.

[0011] Furthermore, the rotation angle limiting mechanism also includes a fan-shaped limiting groove and an angle limiting protrusion placed in the fan-shaped limiting groove. Either the fan-shaped limiting groove or the angle limiting protrusion is provided on the handrail body, and the other is provided on the fixed base.

[0012] Furthermore, in the rotation trajectory direction of the handrail body, a gear control structure is provided between the fan-shaped limiting groove and the angle limiting protrusion, and the gear control structure is a tick-type gear control structure.

[0013] Furthermore, the gear control structure includes several gear recesses and a sphere, one of which is located at the bottom of the fan-shaped limiting groove, and the other is located at the angle limiting protrusion, and the sphere is inserted into any one of the gear recesses by an elastic member.

[0014] As one application, this application also provides a seat, which includes the armrests mentioned above.

[0015] Compared with existing technologies, the advantages of this application are as follows: by setting an axial limiting structure, a stable axial clamping is formed, eliminating the axial movement of the handrail body after long-term use, and significantly improving the structural stability and reliability; at the same time, the elastic damping component can ensure that the handrail body can stay stably at any angle, overcoming the defects of handrail loosening and damping failure in existing technologies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of the main structure of the handrail of this utility model;

[0017] Figure 2 An exploded view of the main structure of the handrail of this utility model.

[0018] Figure 3 This is an enlarged schematic diagram of the main structure of the annular part of this utility model.

[0019] Figure 4 Two exploded view diagrams illustrating the assembly of the main handrail structure of this utility model;

[0020] Figure 5 for Figure 4 Enlarged detail view of key components in area A;

[0021] Figure 6 This is a schematic front view of the main structure of the fixed base of this utility model;

[0022] Figure 7 This is a schematic front view of the main structure of the annular part of this utility model.

[0023] In the figure, there is a fixed base 1, a shaft 11, an annular receiving groove 12, a handrail body 2, an annular part 21, a through hole 211, a fan-shaped limiting groove 22, an angle limiting protrusion 23, a mounting hole 231, a fastener 31, at least part 32, the remaining part 33, a circumferential limiting protrusion 41, a circumferential limiting groove 42, a stop recess 51, a sphere 52, and a first shaft X. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] Example 1

[0029] like Figure 1 As shown, an armrest for a seat configuration includes a fixed base 1 for fixed connection with the seat, and an armrest body 2 connected to the fixed base 1 by a rotation angle limiting mechanism. The armrest body 2 is used to support the user's arm.

[0030] Its special features, such as Figure 2 As shown, the aforementioned rotation angle limiting mechanism includes a through hole 211 provided in the handrail body 2, and a shaft portion 11 inserted into the through hole 211 on the fixed base 1. The handrail body 2 can rotate around the shaft portion 11 within a specific angle range. The basis for this is that an axial limiting structure is provided between the shaft portion 11 and the through hole 211 to prevent the handrail body 2 from axially moving relative to the shaft portion 11.

[0031] Furthermore, such as Figures 2-4 As shown, the axial limiting structure includes a fastener 31, at least a portion 32 and a remaining portion 33, at least a portion 32 conforming to one end of the outer peripheral surface of the through hole 211, and the remaining portion 33 conforming to the other end of the outer peripheral surface of the through hole 211.

[0032] Specifically, the handrail body 2 has an annular portion 21 with a through hole 211 inside, at least part 32 is in close contact with one end face of the annular portion 21, and an annular damping ring is in contact with the other end face of the annular portion 21. The surface area of ​​the annular damping ring in contact with the other end face of the annular portion 21 is smaller than the surface area of ​​the other end face of the annular portion 21.

[0033] In this embodiment, at least part 32 is an annular retaining ring, which is used to cooperate with the fastener 31 so that the annular part 21 is always fixed relative to the fixed base 1 in the first axis X direction; and a circumferential limiting structure is provided between the annular retaining ring and the shaft part 11, which is used to keep the annular retaining ring relative to the handrail body 2 stationary.

[0034] like Figure 3 and Figure 6As shown, the circumferential limiting structure includes a circumferential limiting protrusion 41 and a circumferential limiting groove 42. Either the circumferential limiting protrusion 41 or the circumferential limiting groove 42 is located on the annular retaining ring, and the other is located on the shaft portion 11. The circumferential limiting protrusion 41 is inserted into the circumferential limiting groove 42. When the annular portion 21 rotates relative to the shaft portion 11, the annular retaining ring is circumferentially fixed relative to the shaft portion 11 under the control of the circumferential limiting structure. In this embodiment, the circumferential limiting protrusion 41 is located on the outer circumferential surface of the shaft portion 11, and the circumferential limiting groove 42 is correspondingly located on the inner circumferential surface of the annular retaining ring. When the handrail body 2 rotates, the structure on the annular portion 21 (or directly through the annular portion 21) attempts to rotate the annular retaining ring, but the annular retaining ring is circumferentially fixed to the shaft portion 11. At this time, relative rotation occurs between the annular portion 21 and the annular retaining ring.

[0035] The remaining part 33 is an annular damping ring, which plays a role in rotational damping. The annular damping ring is in close contact with the other end face of the annular part 21 and is pressed between the annular part 21 and the fastener 31 by the axial preload applied by the fastener 31.

[0036] Furthermore, the fastener 31 is a lock nut, which is screwed onto the external thread at the end of the shaft portion 11; at least part 32, namely the annular retaining ring, is located between the end face of the annular portion 21 away from the fixed base 1 and the lock nut.

[0037] Specifically, by tightening the locking nut, the annular retaining ring is pressed against one end face of the annular portion 21, while the annular damping ring is pressed against the other end face of the annular portion 21, thereby forming a clamp at both ends of the annular portion 21 to achieve axial limiting. More importantly, tightening / loosening the fastener 31 can easily adjust the magnitude of the axial preload, thereby precisely controlling the damping force to adapt to different needs, and effectively compensating for wear after long-term use, maintaining stable performance, and greatly overcoming the defects of existing technologies such as handrail loosening, damping failure, inconvenient adjustment, and difficult maintenance.

[0038] In this embodiment, the annular damping ring is made of silicone material with elastic and frictional properties. When the handrail body 2 rotates around the shaft 11, frictional resistance is generated between the other end face of the annular part 21 and the annular damping ring. This frictional resistance is the rotational damping, which is used to prevent the handrail body 2 from rotating arbitrarily when no external force is applied, and to keep it in the desired position when adjusting the angle. The tightness of the locking nut can adjust the pressure applied to the annular damping ring, thereby realizing the adjustment of the magnitude of the rotational damping force.

[0039] The fixed base 1 has an annular receiving groove 12 at one end of the shaft portion 11. An annular damping ring is installed in the annular receiving groove 12 and the groove depth of the annular receiving groove 12 is less than the thickness of the annular damping ring.

[0040] The rotation angle limiting mechanism also includes a sector-shaped limiting groove 22 and an angle limiting protrusion 23 disposed within the sector-shaped limiting groove 22. Either the sector-shaped limiting groove 22 or the angle limiting protrusion 23 is disposed on the handrail body 2, and the other is disposed on the fixed base 1. In this embodiment, the sector-shaped limiting groove 22 is disposed on the annular portion 21 of the handrail body 2, and the angle limiting protrusion 23 is disposed on the fixed base 1.

[0041] In the rotation trajectory direction of the handrail body 2, a gear control structure is provided between the fan-shaped limiting groove 22 and the angle limiting protrusion 23. The gear control structure is a tick-type gear control structure.

[0042] Similarly, such as Figure 6 and Figure 7 As shown, the gear control structure includes several gear recesses 51 and a ball 52 (or glass bead). Either the gear recess 51 or the ball 52 is located at the bottom of the fan-shaped limiting groove 22, and the other is located at the angle limiting protrusion 23. The ball 52 is inserted into any one of the gear recesses 51 by an elastic member.

[0043] In this embodiment, the sphere 52 is disposed on the angle limiting protrusion 23, and a number of stop recesses 51 are arranged at equal or unequal intervals along the rotation trajectory of the handrail body 2 at the bottom of the fan-shaped limiting groove 22.

[0044] Its special feature is that the elastic element is a compression spring. One end of the compression spring abuts against the bottom of the mounting hole 231 opened inside the angle limiting protrusion 23, and the other end abuts against the ball 52, continuously providing a force to press the ball 52 against the bottom of the fan-shaped limiting groove 22.

[0045] Specifically, when the armrest body 2 rotates around the shaft 11, the annular part 21 drives the fan-shaped limiting groove 22 on it to rotate synchronously. The position recess 51 at the bottom of the groove passes through the ball 52 on the fixed angle limiting protrusion 23 in sequence. When the ball 52 slides into a certain position recess 51, under the action of the compression spring, the ball 52 is partially embedded in the recess, generating a positioning feeling and making a "tick" sound, and the armrest body 2 is locked at that position angle. When the user applies a rotational force sufficient to overcome the spring pressure, the ball 52 is squeezed out of the current position recess 51 and slides along the bottom of the groove until it falls into the next position recess 51, thereby realizing the step adjustment of the rotation angle of the armrest body 2 between preset positions.

[0046] Furthermore, the gear position recess 51 is a hemispherical indentation or a V-shaped groove, and the sphere 52 is a steel ball or a hard plastic ball. The two work together to create a clear gear position feel and sound. The preload of the compression spring determines the amount of force required for gear shifting.

[0047] Example 2

[0048] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that, in relation to the armrest of Embodiment 1, the seat in this embodiment includes an armrest.

[0049] Chairs are widely used in offices and workplaces. They typically feature adjustable height, tilt, and armrests to meet the needs of different users and support proper posture during extended periods of sitting. High-quality chairs not only reduce spinal pressure and improve work efficiency but also improve posture and overall user health. Furthermore, modern chairs often come with breathable fabrics and casters, allowing users to move freely in the office environment.

[0050] 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 handrail, comprising a fixed base (1) and a handrail body (2) connected to the fixed base (1) by a rotation angle limiting mechanism, characterized in that, The rotation angle limiting mechanism includes a through hole (211) on the handrail body (2), a shaft (11) inserted into the through hole (211) on the fixed base (1), and an axial limiting structure between the shaft (11) and the through hole (211) to prevent the handrail body (2) from axially moving relative to the shaft (11). The axial limiting structure includes a fastener (31), at least part (32) and remaining part (33). The at least part (32) conforms to the outer periphery of one end of the through hole (211), and the remaining part (33) conforms to the outer periphery of the other end of the through hole (211). The remaining part (33) is made of elastic material and plays a role in rotational damping. The fastener (31) passes through the at least part (32) and is connected to at least the shaft (11), and the fastener (31) is threaded to at least the shaft (11).

2. The handrail according to claim 1, characterized in that, The fixed base (1) has an annular receiving groove (12) at one end of the shaft portion (11), and the remaining portion (33) is an annular damping ring, which is installed in the annular receiving groove (12) and the groove depth of the annular receiving groove (12) is less than the thickness of the annular damping ring.

3. The handrail according to claim 1, characterized in that, The at least portion (32) is an annular retaining ring, and a circumferential limiting structure is provided between the annular retaining ring and the shaft portion (11), the circumferential limiting structure being used to keep the annular retaining ring stationary relative to the armrest body (2).

4. The handrail according to claim 3, characterized in that, The circumferential limiting structure includes a circumferential limiting protrusion (41) and a circumferential limiting groove (42). One of the circumferential limiting protrusion (41) and the circumferential limiting groove (42) is provided on the annular retaining ring, and the other is provided on the shaft portion (11). The circumferential limiting protrusion (41) is inserted into the circumferential limiting groove (42).

5. The handrail according to claim 2, characterized in that, The armrest body (2) has an annular portion (21) with the through hole (211) inside, the at least portion (32) is in close contact with one end face of the annular portion (21), and the annular damping ring is in contact with the other end face of the annular portion (21).

6. The handrail according to claim 5, characterized in that, The surface area of ​​the annular damping ring that contacts the other end face of the annular portion (21) is smaller than the surface area of ​​the other end face of the annular portion (21).

7. The handrail according to claim 1, characterized in that, The rotation angle limiting mechanism further includes a fan-shaped limiting groove (22) and an angle limiting protrusion (23) placed in the fan-shaped limiting groove (22). Either the fan-shaped limiting groove (22) or the angle limiting protrusion (23) is provided on the handrail body (2), and the other is provided on the fixed base (1).

8. The handrail according to claim 7, characterized in that, In the rotation trajectory direction of the handrail body (2), a gear control structure is provided between the fan-shaped limiting groove (22) and the angle limiting protrusion (23), and the gear control structure is a tick-type gear control structure.

9. The handrail according to claim 8, characterized in that, The gear control structure includes several gear recesses (51) and a ball (52). Either the gear recess (51) or the ball (52) is located at the bottom of the fan-shaped limiting groove (22), and the other is located at the angle limiting protrusion (23). The ball (52) is inserted into any one of the gear recesses (51) by an elastic member.

10. A seat, characterized in that, The seat includes the armrest as described in any one of claims 1-9.

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