Self-circulation supporting and adjusting mechanism and seat

Abstract

The utility model provides a self-circulation support adjusting mechanism and seat, the adjusting mechanism comprises a first part, a second part, a self-circulation clamping part and a self-circulation clamping piece, the self-circulation clamping part and the self-circulation clamping piece are respectively arranged on the first part and the second part, the first part and the second part are connected in a sliding mode, and the self-circulation clamping part and the self-circulation clamping piece are connected in a sliding mode. Adjustment and supporting are achieved through the self-circulation clamping part and the self-circulation clamping piece. An elastic piece which moves together with the self-circulation clamping piece when the first component and the second component slide relatively is arranged beside the self-circulation clamping piece, the self-circulation clamping piece comprises a limiting convex part, the elastic piece comprises a pushing part and a limiting part, and when the limiting convex part is located on the pushing part, the self-circulation clamping piece is clamped with the self-circulation clamping part in a one-way mode; the first component and the second component can be adjusted in a one-way mode, when the limiting protruding part is located on the limiting part, clamping of the self-circulation clamping part and the self-circulation clamping piece is disengaged all the time, and self-circulation of the first component and the second component is achieved. In the chair, the chair back and the armrests can be lifted and lowered by using the adjusting mechanism.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a self-circulating support adjustment mechanism and a seat. Background Technology

[0002] As people's living standards improve, chairs, as one of the most common pieces of furniture, are increasingly demanding higher levels of comfort from consumers. To enhance chair comfort, manufacturers have made improvements to the chair's adaptability, such as adjusting the backrest height and armrest height. With increased adaptability, chairs can accommodate a wider range of body types, allowing people of different sizes to adjust the chair to their preferred or comfortable position.

[0003] When making adaptive adjustments to components such as chair backs and armrests, an internal adjustment mechanism is indispensable. Adjustment mechanisms like gas springs are heavy and expensive, making them unsuitable for use on chair backs and armrests. Therefore, a new adjustment mechanism needs to be designed that not only meets the basic requirements of adjustment and support, but also needs to be simple in structure, lightweight, and low in cost. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a self-circulating support and adjustment mechanism, including a first component, a second component, a self-circulating locking part, and a self-circulating locking member. The self-circulating locking part and the self-circulating locking member are respectively disposed on the first component and the second component, and the first component and the second component are slidably connected. Adjustment and support are achieved through the self-circulating locking part and the self-circulating locking member. When the first component and the second component are locked together, they can maintain their relative positions and be used for support. An elastic member is provided on the side of the self-circulating locking member. When the first component and the second component slide relative to each other, the elastic member and the self-circulating locking member move together. The self-circulating locking member includes a limiting protrusion, and the elastic member includes a pushing part and a limiting part. When the limiting protrusion is on the pushing part, the self-circulating locking member and the self-circulating locking part are locked in one direction, and the first component and the second component can be adjusted in one direction. When the limiting protrusion is on the limiting part, the locking of the self-circulating locking part and the self-circulating locking member is always disengaged, which can realize the self-circulation of the first component and the second component.

[0005] Furthermore, a seat is provided, including a back support, a back frame, and the aforementioned self-circulating adjustment mechanism. The back support is the first component, and the back frame is the second component. The two components achieve self-circulating support adjustment through a self-circulating snap-fit ​​member and a self-circulating snap-fit ​​part.

[0006] Another type of seat includes an armrest seat, an armrest support, and the aforementioned self-circulating adjustment mechanism. The armrest seat is the first component, and the armrest support is the second component. The two achieve self-circulating support adjustment through a self-circulating snap-fit ​​component and a self-circulating snap-fit ​​part.

[0007] The technical solution of this utility model is implemented as follows:

[0008] A self-circulating support adjustment mechanism includes a first component, a second component, a self-circulating engaging portion, and a self-circulating engaging member. The first component and the second component are interconnected and slidably engaged. The self-circulating engaging portion is disposed on one of the first component or the second component, and the self-circulating engaging member is rotatably disposed on the other of the first component or the second component. The self-circulating engaging member and the self-circulating engaging portion are configured to selectively engage to maintain the relative position of the first component and the second component after sliding. An elastic member is provided on the side of the self-circulating engaging member. When the first component and the second component slide, the elastic member moves together with the self-circulating engaging member. The self-circulating engaging member includes a limiting protrusion, and the elastic member includes a pushing portion and a limiting portion. The limiting protrusion abuts against the pushing portion or the limiting portion and selectively switches between the two. When the pushing portion is configured such that the limiting protrusion abuts against the pushing portion, the pushing portion provides elastic force for engaging the self-circulating engaging member and the self-circulating engaging portion. When the limiting portion is configured such that the limiting protrusion abuts against the limiting portion, the self-circulating engaging member and the self-circulating engaging portion remain disengaged to achieve self-circulation of the sliding of the first component and the second component.

[0009] When the limiting protrusion is on the pushing part, the self-circulating engaging member and the self-circulating engaging part engage unidirectionally, and the first and second components can be adjusted unidirectionally. The self-circulating engaging member and the self-circulating engaging part selectively engage under the action of the pushing part of the elastic member. Due to the elasticity of the elastic member, the elastic force on the pushing part allows the self-circulating engaging member and the self-circulating engaging part to engage automatically. However, when subjected to a force applied by the user for adjustment, the self-circulating engaging member can briefly disengage from the self-circulating engaging part to adjust its position. When the adjustment force is lost, the pushing part allows the self-circulating engaging member and the self-circulating engaging part to re-engage. When engaged, if subjected to a load force opposite to the direction of the applied force, the engagement provides support, keeping the first and second components relatively stationary. When the limiting protrusion is on the limiting part, the engagement between the self-circulating engaging part and the self-circulating engaging member is always disengaged, enabling self-circulation of the first and second components, i.e., readjustment after reset.

[0010] Preferably, the self-circulating snap-fit ​​part includes a support part, and the self-circulating snap-fit ​​component also includes a support protrusion. The support part has several slots arranged along the length of the self-circulating snap-fit ​​part. The support protrusion is configured to engage with the slots in a unidirectional manner. When the support protrusion moves on the support part, a limiting protrusion abuts against a pushing part. The pushing part is configured to provide a spring force to the support protrusion towards the slot when the support protrusion moves away from the slot. When the limiting protrusion abuts against the limiting part, it keeps the support protrusion always disengaged from the slot. The snap-fit ​​method between the support protrusion and the slot is structurally simple and easy to implement. Since the self-circulating snap-fit ​​component and the self-circulating snap-fit ​​part are engaged in a unidirectional manner, it means that when the first component and the second component move relative to each other, they can move in one direction to achieve an adjustment effect, but cannot move in the other direction to achieve a support effect. Furthermore, after adjustment, the unidirectional snap-fit ​​remains, enabling both unidirectional adjustment and unidirectional support in the other direction.

[0011] Preferably, the self-circulating latching part further includes a reset part and a first limiting part. Along the length of the self-circulating latching part, the reset part and the first limiting part are located on opposite sides of the support part. The self-circulating latching member also includes a support protrusion and a second limiting part. The first and second limiting parts are configured to abut against each other and drive the self-circulating latching member to rotate until the limiting protrusion abuts against the limiting part, allowing the support protrusion to pass over the support part and reach the reset part. The reset part is configured such that the support protrusion abuts against the reset part and drives the self-circulating latching member to rotate, enabling the limiting protrusion to switch from the limiting part to the pushing part. The first and second limiting parts are used to switch the limiting protrusion from the pushing part to the limiting part, allowing the support protrusion to pass over the latching slot. When the support protrusion abuts against the reset part, the limiting protrusion switches back to the pushing part, the support protrusion re-engages with the latching slot, and the self-circulating latching member and the self-circulating latching part are reset.

[0012] Preferably, the supporting protrusion, the second limiting part, and the limiting protrusion move synchronously. The synchronous movement of the three parts enables them to form an interconnected situation, allowing the self-circulating latching part to produce different states as a whole when moving relative to the self-circulating latching part, thereby forming different movement modes to perform movements such as adjustment support, crossing the latching groove, and resetting.

[0013] Preferably, the support protrusion and the limiting protrusion are located on the same side of the rotation point, while the two and the second limiting part are located on opposite sides of the rotation point. Although all three rotate clockwise or counterclockwise, the directions of their displacement due to rotation will differ; that is, the support protrusion and the limiting protrusion on the same side will produce displacement in the same direction when they rotate, while the displacement produced by the two and the second limiting part will be in opposite directions. The position of the limiting protrusion on the elastic member determines the state of the support protrusion. The two move away from or towards the slot together to switch between the two states of adjusting support and crossing the slot. Since the first limiting part and the reset part are on opposite sides of the support part, the second limiting part and the support protrusion must be set on opposite sides of the rotation point. When the second limiting part rotates due to contact with the first limiting part, it will produce a displacement closer to the slot, while the support protrusion and the limiting protrusion can produce a displacement away from the slot, so that the limiting protrusion can switch to the limiting part.

[0014] Preferably, the pushing part is located on the side closer to the support part, and the limiting part is located on the side farther from the support part. Since the pushing part is close to the support part, when the limiting protrusion is located on the pushing part, it is subjected to the elastic force of the pushing part, causing the limiting protrusion and the support protrusion to move together towards the slot of the support part, and enabling the support protrusion to effectively engage in the slot to achieve unidirectional engagement; while the elastic force of the limiting part keeps both the support protrusion and the limiting protrusion detached from the slot.

[0015] Preferably, the connection between the first component and the second component is a plug-in connection.

[0016] A seat includes a back support, a back frame, and a self-circulating adjustment mechanism as described above. The back support is a first component, and the back frame is a second component. The back support is inserted into the back frame, and the back frame is provided with a self-circulating latching component. The back support is also provided with a self-circulating latching part. This design allows the back frame to be adjusted for height and height in a self-circulating manner on the back support.

[0017] A seat includes an armrest seat, an armrest support, and a self-circulating adjustment mechanism as described above. The armrest seat is the first component, and the armrest support is the second component. The armrest support is inserted into the armrest seat. The armrest seat has a self-circulating engaging portion, and the armrest support has a self-circulating engaging component. This design allows the armrest support to self-circulate and adjust its height on the armrest seat.

[0018] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0019] When the limiting protrusion is on the pushing part, the self-circulating engaging member and the self-circulating engaging part engage unidirectionally, and the first and second components can be adjusted unidirectionally. The self-circulating engaging member and the self-circulating engaging part selectively engage under the action of the pushing part of the elastic member. Due to the elasticity of the elastic member, the elastic force on the pushing part allows the self-circulating engaging member and the self-circulating engaging part to engage automatically. However, when subjected to a force applied by the user for adjustment, the self-circulating engaging member can briefly disengage from the self-circulating engaging part to adjust its position. When the adjustment force is lost, the pushing part allows the self-circulating engaging member and the self-circulating engaging part to re-engage. When engaged, if subjected to a load force opposite to the direction of the applied force, the engagement provides support, keeping the first and second components relatively stationary. When the limiting protrusion is on the limiting part, the engagement between the self-circulating engaging part and the self-circulating engaging member is always disengaged, enabling self-circulation of the first and second components, i.e., readjustment after reset.

[0020] The backrest and armrest support components in the seat can achieve self-circulating support adjustment through self-circulating snap-fit ​​parts to adapt to the different requirements of different people and achieve higher comfort. Moreover, the self-circulating support adjustment mechanism has a simple and lightweight structure, is easy to install and use, and has a low cost. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the seat in the embodiment of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the connection between the back frame and the back support in an embodiment of the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the self-circulating snap-fit ​​part and the self-circulating snap-fit ​​component provided between the back frame and the back support in an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the self-circulating snap-fit ​​component on the sealing plate in an embodiment of the present invention. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the self-circulating snap-fit ​​component on the sealing plate in an embodiment of the present invention. Figure 2 ;

[0026] Figure 6 This is a three-dimensional structural diagram of the back support in an embodiment of the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the connection between the handrail support and the handrail seat in an embodiment of the present invention;

[0028] Figure 8This is a three-dimensional structural diagram of the armrest seat in an embodiment of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the self-circulating snap-fit ​​component disposed on a plate-like body in an embodiment of the present invention.

[0030] The reference numerals in the attached drawings are as follows: self-circulating snap-fit ​​part 1; support part 11; reset part 12; first limiting part 13; self-circulating snap-fit ​​part 2; support protrusion 21; second limiting part 22; limiting protrusion 23; sheet-like body 24; slot 3; elastic element 4; pushing part 41; limiting part 42; snap tooth 5; seat 6; chassis 7; back support 8; support arm 81; back frame 9; lower crossbar 91; armrest seat 14; slot 141; armrest support 15; plate-like body 151; decorative sleeve 152; insertion hole 16; window 17; sealing plate 18; mounting groove 19. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The specific embodiments of this utility model are as follows:

[0035] like Figure 3-9 As shown, this utility model provides a self-circulating support adjustment mechanism, including a first component, a second component, a self-circulating snap-fit ​​part 1, and a self-circulating snap-fit ​​member 2. The first component and the second component are connected to each other and are slidably engaged. The self-circulating snap-fit ​​part 1 is disposed on one of the first component or the second component, and the self-circulating snap-fit ​​member 2 is rotatably disposed on the other of the first component or the second component.

[0036] The self-circulating snap-fit ​​part 1 includes a support part 11, a reset part 12 and a first limiting part 13. The support part 11 is provided with a plurality of slots 3, which are arranged along the length direction of the self-circulating snap-fit ​​part 1. In the length direction of the self-circulating snap-fit ​​part 1, the reset part 12 and the first limiting part 13 are respectively located on both sides of the support part 11.

[0037] The self-circulating snap-fit ​​component 2 includes a support protrusion 21, a second limiting part 22, and a limiting protrusion 23 that move synchronously. The support protrusion 21 is configured to engage with the snap-fit ​​slot 3 in one direction. An elastic member 4 is provided on the side of the self-circulating snap-fit ​​component 2. When the first component and the second component slide, the elastic member 4 moves together with the self-circulating snap-fit ​​component 2. The elastic member 4 includes a pushing part 41 and a limiting part 42. The pushing part 41 is located on the side closer to the support part 11, and the limiting part 42 is located on the side away from the support part 11. The limiting protrusion 23 abuts against the pushing part 41 or the limiting part 42 and selectively switches between the two.

[0038] When the support protrusion 21 moves on the support part 11, the limiting protrusion 23 abuts against the pushing part 41. The pushing part 41 is configured to give the support protrusion 21 a spring force toward the slot 3 when the support protrusion 21 moves away from the slot 3.

[0039] When the limiting protrusion 23 abuts against the limiting part 42, the supporting protrusion 21 is always disengaged from the slot 3.

[0040] The first limiting part 13 and the second limiting part 22 are configured such that when they abut against each other and drive the self-circulating snap-fit ​​member 2 to rotate until the limiting protrusion 23 abuts against the limiting part 42, the supporting protrusion 21 can pass over the supporting part 11 to reach the reset part 12.

[0041] The reset part 12 is configured to support the protrusion 21 to abut against the reset part 12 and drive the self-circulating snap-fit ​​member 2 to rotate, so that the limiting protrusion 23 can switch from the limiting part 42 to the pushing part 41.

[0042] When the limiting protrusion 23 is on the pushing part 41, the self-circulating latching member 2 and the self-circulating latching part 1 engage in one direction, and the first component and the second component can be adjusted in one direction. The self-circulating latching member 2 and the self-circulating latching part 1 achieve selective engagement under the action of the pushing part 41 of the elastic member 4. Since the elastic member 4 is elastic, the elastic force on the pushing part 41 can make the self-circulating latching member 2 and the self-circulating latching part 1 engage on their own. However, when subjected to the force used by the user for adjustment, the self-circulating latching member 2 can briefly disengage from the self-circulating latching part 1 to adjust its position. When the adjustment force is lost, the pushing part 41 can make the self-circulating latching member 2 and the self-circulating latching part 1 re-engage. When the two are engaged, if subjected to a load force opposite to the direction of the force, the engagement can provide support and keep the first component and the second component relatively stationary. When the limiting protrusion 23 is on the limiting part 42, the self-circulating snap-fit ​​part 1 and the self-circulating snap-fit ​​part 2 are always disengaged, which can realize the self-circulation of the first part and the second part, that is, readjustment after reset.

[0043] The engagement between the supporting protrusion 21 and the slot 3 is simple in structure and easy to implement. Since the self-circulating engaging member 2 and the self-circulating engaging part 1 are unidirectionally engaged, it means that when the first and second components move relative to each other, they can move in one direction to achieve adjustment, but cannot move in the other direction to achieve support. Furthermore, after adjustment, the unidirectional engagement remains, enabling both unidirectional adjustment and unidirectional support in the other direction. The first limiting part 13 and the second limiting part 22 are used to switch the limiting protrusion 23 from the pushing part 41 to the limiting part 42, allowing the supporting protrusion 21 to pass over the slot 3. When the supporting protrusion 21 abuts against the reset part 12, the limiting protrusion 23 switches back to the pushing part 41, and the supporting protrusion 21 re-engages with the slot 3, thus resetting the self-circulating engaging member 2 and the self-circulating engaging part 1.

[0044] Specifically, such as Figure 4 , 5 As shown in Figure 9, the self-circulating snap-fit ​​component 2 is integrally formed. The self-circulating snap-fit ​​component 2 also includes a sheet-like body 24 as the main body. The supporting protrusion 21 and the limiting protrusion 23 are both columnar. The supporting protrusion 21, the limiting protrusion 23, and the second limiting part 22 are all disposed on the sheet-like body 24. The supporting protrusion 21 and the limiting protrusion 23 are disposed on the lower end of the sheet-like body 24, and the supporting protrusion 21 and the limiting protrusion 23 protrude from the sheet-like body 24 to both sides. The second limiting part 22 is located at the upper end of the sheet-like body 24 and... The support protrusion 21, the second limiting part 22, and the limiting protrusion 23 protrude upwards from the sheet-like body 24, with the rotation point located at the upper part of the middle of the sheet-like body 24. Therefore, the support protrusion 21, the second limiting part 22, and the limiting protrusion 23 move synchronously. However, the support protrusion 21 and the limiting protrusion 23 are located on the same side of the rotation point, while the second limiting part 22 and the support protrusion 23 are located on opposite sides of the rotation point. The synchronous movement of the three components enables them to be interconnected, allowing the self-circulating latching member 2 to exhibit different states as it moves relative to the self-circulating latching part 1. This results in different movement modes for adjusting support, crossing the slot 3, and resetting. Although all three rotate clockwise or counterclockwise, the direction of their displacement due to rotation differs. Specifically, the support protrusion 21 and the limiting protrusion 23 on the same side rotate in the same direction, while their displacement with the second limiting part 22 is in the opposite direction. The position of the limiting protrusion 23 on the elastic member 4 determines the state of the support protrusion 21. Both move away from or towards the slot 3 to switch between the two states of adjusting support and crossing the slot 3. Since the first limiting part 13 and the resetting part 12 are on both sides of the support part 11, the second limiting part 22 and the support protrusion 21 must be set on both sides of the rotation point. When the second limiting part 22 and the first limiting part 13 rotate due to contact, they move closer to the slot 3, while the support protrusion 21 and the limiting protrusion 23 move away from the slot 3, allowing the limiting protrusion 23 to switch onto the limiting part 42.

[0045] Both the first limiting part 13 and the second limiting part 22 have inclined surfaces. The two parts drive the self-circulating latching member 2 to rotate by abutting the inclined surfaces, and cause the supporting protrusion 21 to rotate away from the slot 3. The reset part 12 also has an inclined surface. The direction of the inclined surface is such that when the supporting protrusion 21 moves against it, it can rotate the supporting protrusion 21 toward the slot 3 to achieve self-circulating reset.

[0046] Each of the two adjacent slots 3 of the support part 11 has a locking tooth 5, which is an upward-curved ratchet shape, thereby achieving unidirectional locking. It locks and supports the self-circulating locking member 2 when subjected to a downward force, and can move relative to it for adjustment when subjected to an upward force. The elastic member 4 is a spring sheet, which is located on the same component as the self-circulating locking member 2, and the two move together. The elastic member 4 is located on the side of the sheet-like body 24 with the limiting protrusion 23. The elastic member 4 is bent to form the pushing part 41 and the limiting part 42. The pushing part 41 is located near... On the side near the support portion 11, the limiting portion 42 is located on the side away from the support portion 11, and the pushing portion 41 is inclined downward toward the slot 3, while the limiting portion 42 is inclined downward away from the slot 3. Therefore, when the limiting protrusion 23 is located on the pushing portion 41, it is subjected to the elastic force of the pushing portion 41, causing the limiting protrusion 23 and the support protrusion 21 to approach the slot 3 of the support portion 11 together, and enabling the support protrusion 21 to be effectively engaged in the slot 3 to achieve one-way engagement; while the elastic force of the limiting portion 42 can keep both the support protrusion 21 and the limiting protrusion 23 in a state of being detached from the slot 3.

[0047] The connection between the first component and the second component is a plug-in connection, that is, the first component is plugged into or fitted onto the second component. Specifically, for example... Figure 1-3 As shown in Figure 7, the self-circulating support adjustment mechanism is applied in a chair. The chair includes a seat 6, a base 7, a back support 8, a back frame 9, an armrest seat 14, an armrest support 15, and the aforementioned self-circulating adjustment mechanism. The base 7 is located below the seat 6, the back support 8 is mounted on the base 7, the back frame 9 is fitted onto the back support 8 and is self-circulatingly raised and lowered on the back support 8, the armrest seat 14 is mounted on the seat 6, and the armrest support 15 is inserted into the armrest seat 14 and self-circulatingly raised and lowered. It is set on the armrest seat 14; further, for the back support 8 and the back frame 9, the back support 8 is the first component and the back frame 9 is the second component. The back frame 9 is provided with a self-circulating snap-fit ​​part 2, and the back support 8 is rotatably provided with a self-circulating snap-fit ​​part 1. For the armrest seat 14 and the armrest support 15, the armrest seat 14 is the first component and the armrest support 15 is the second component. The armrest seat 14 is provided with a self-circulating snap-fit ​​part 1, and the armrest support 15 is rotatably provided with a self-circulating snap-fit ​​part 2.

[0048] Furthermore, such as Figure 2-6As shown, the back support 8 has two arms 81, and the back frame 9 includes a lower crossbar 91 with two insertion holes 16. The two arms 81 are respectively inserted into the two insertion holes 16. One of the arms 81 is provided with a self-circulating snap-fit ​​part 1, wherein the reset part 12 is located at the bottom and the first limiting part 13 is located at the top. The lower crossbar 91 has a forward-opening window 17 at the corresponding insertion hole 16 position, and a sealing plate 18 is installed in the window 17. The sealing plate 18 is fixedly connected to the lower crossbar 91 by screws. The self-circulating snap-fit ​​part 2 The self-circulating snap-fit ​​part 1 is rotatably connected to the sealing plate 18 and is located on the side of the sealing plate 18 facing the self-circulating snap-fit ​​part 1. A mounting groove 19 for mounting the elastic member 4 is provided on the same side of the sealing plate 18, and the limiting protrusion 23 is also located in the mounting groove 19. When the self-circulating snap-fit ​​part 2 rotates, the limiting protrusion 23 moves in the mounting groove 19. The back frame 9 can be raised and lowered on the back support 8 through the self-circulating snap-fit ​​part 1 and the self-circulating snap-fit ​​part 2. When it rises, it has a stop due to the presence of the snap-fit ​​groove 3. When it falls, it returns directly to the initial position to perform self-circulating raising and lowering movement.

[0049] like Figure 7-9 As shown, the handrail support 15 includes a downwardly extending plate-like body 151, and the handrail seat 14 has a vertically extending slot 141. The plate-like body 151 is inserted into the slot 141. The self-circulating snap-fit ​​part 1 is vertically arranged on the handrail seat 14, with the reset part 12 located at the bottom and the first limiting part 13 located at the top. The self-circulating snap-fit ​​part 2 is rotatably arranged on the plate-like body 151 via a rotating shaft, and the plate-like body 151 also has an installation groove 19 for accommodating the elastic member 4. The handrail support 15 can be adjusted up and down on the handrail seat 14 through the self-circulating snap-fit ​​part 2 and the self-circulating snap-fit ​​part 1. When rising, it has a stop due to the presence of the slot 3, and when falling, it directly returns to the initial position to perform self-circulating lifting and lowering motion. The handrail support 15 is also provided with a decorative sleeve 152, which is sleeved on the outside of the handrail seat 14.

Claims

1. A self-circulating support adjustment mechanism, characterized in that: The device includes a first component, a second component, a self-circulating engaging portion, and a self-circulating engaging member. The first component and the second component are interconnected and slide in cooperation. The self-circulating engaging portion is disposed on one of the first component or the second component, and the self-circulating engaging member is rotatably disposed on the other of the first component or the second component. The self-circulating engaging member and the self-circulating engaging portion are configured to selectively engage to maintain the relative position of the first component and the second component after sliding. An elastic member is provided on the side of the self-circulating engaging member. When the first component and the second component slide, the elastic member moves together with the self-circulating engaging member. The self-circulating engaging member includes a limiting protrusion, and the elastic member includes a pushing portion and a limiting portion. The limiting protrusion abuts against the pushing portion or the limiting portion and selectively switches between the two. When the pushing portion is configured such that the limiting protrusion abuts against the pushing portion, the pushing portion provides elastic force for engaging the self-circulating engaging member and the self-circulating engaging portion. When the limiting portion is configured such that the limiting protrusion abuts against the limiting portion, the self-circulating engaging member and the self-circulating engaging portion remain disengaged to achieve self-circulation of the sliding of the first component and the second component.

2. The self-circulating support adjustment mechanism according to claim 1, characterized in that: The self-circulating snap-fit ​​part includes a support part and a support protrusion. The support part is provided with a plurality of slots, which are arranged along the length direction of the self-circulating snap-fit ​​part. The support protrusion is configured to engage with the slots in one direction. When the support protrusion moves on the support part, the limiting protrusion abuts against the pushing part. The pushing part is configured to provide the support protrusion with a spring force toward the slot when the support protrusion moves away from the slot. When the limiting protrusion abuts against the limiting part, the support protrusion is kept disengaged from the slot.

3. The self-circulating support adjustment mechanism according to claim 2, characterized in that: The self-circulating latching part also includes a reset part and a first limiting part. In the length direction of the self-circulating latching part, the reset part and the first limiting part are respectively located on both sides of the support part. The self-circulating latching member also includes a support protrusion and a second limiting part. The first limiting part and the second limiting part are configured such that they abut against each other and drive the self-circulating latching member to rotate until the limiting protrusion abuts against the limiting part, at which point the support protrusion can pass over the support part to reach the reset part. The reset part is configured such that the support protrusion abuts against the reset part and drives the self-circulating latching member to rotate, which enables the limiting protrusion to switch from the limiting part to the pushing part.

4. The self-circulating support adjustment mechanism according to claim 3, characterized in that: The supporting protrusion, the second limiting part, and the limiting protrusion move synchronously.

5. The self-circulating support adjustment mechanism according to claim 4, characterized in that: The supporting protrusion and the limiting protrusion are located on the same side of the rotation point, and the two and the second limiting part are located on opposite sides of the rotation point.

6. The self-circulating support adjustment mechanism according to claim 2, characterized in that: The pushing part is located on the side closer to the supporting part, and the limiting part is located on the side farther away from the supporting part.

7. The self-circulating support adjustment mechanism according to claim 1, characterized in that: The connection between the first component and the second component is a plug-in connection.

8. A type of seat, characterized in that: It includes a back support, a back frame, and a self-circulating adjustment mechanism as described in any one of claims 1-7. The back support is a first component, the back frame is a second component, the back support is inserted into the back frame, the back frame is provided with a self-circulating snap-fit ​​component, and the back support is provided with a self-circulating snap-fit ​​part.

9. A type of seat, characterized in that: The device includes an armrest base, an armrest support, and a self-circulating adjustment mechanism as described in any one of claims 1-7. The armrest base is a first component, the armrest support is a second component, the armrest support is inserted into the armrest base, the armrest base is provided with a self-circulating snap-fit ​​part, and the armrest support is provided with a self-circulating snap-fit ​​part.

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