Unidirectional rotating structure and chair armrest and chair thereof

Abstract

The utility model relates to the technical field of chairs, and particularly discloses a one-way rotating structure, a chair armrest thereof and a chair. The one-way rotating structure comprises a guide part, a clamping part and a mounting part. The mounting part is used for combining the guide part and the clamping part, so that the clamping block in the clamping part is meshed with the one-way tooth block structure in the guide part; meanwhile, the clamping part further comprises a mounting block, a limiting rod and a limiting block, a mounting through hole is formed in the mounting block, one end of the limiting rod is connected with the clamping block after passing through the mounting through hole, the other end of the limiting rod is connected with the limiting block, and a return component is arranged between the clamping block and the mounting block. When the clamping block rotates in the first direction, the clamping block can cross the tooth block in the one-way tooth block structure, and when the clamping block rotates in the second direction opposite to the first direction, the clamping block is meshed with the tooth block. The whole structure of the one-way rotating structure is simple, follow-up maintenance and repair work is easy, only replacement of a small part of parts is involved, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to a one-way rotating structure and a chair armrest and a chair. Background Art

[0002] At present, a one-way rotating structure is required in many structures, that is, the structure can be smoothly rotated in a first direction, but will be blocked when rotating in a second direction opposite to the first direction. Take a chair as an example. During the use of the chair, different users have different requirements for the height of the armrests, so a structure that can adjust parameters such as the height of the armrests is usually required. The one-way rotating structure can make the armrests move smoothly when they are lifted, and when they are lifted to the height required by the user and start to be used, the downward movement of the armrests is blocked to prevent the armrests from losing the corresponding supporting effect. There are some corresponding structures on the market, but such one-way rotating structures are mostly formed by a combination of ratchets and pawls. After long-term use, the pawl may lose its reset effect, that is, it is difficult to return to its original position when rotating in the opposite direction and engage with the ratchet. The structure of the pawl is relatively complicated. In this case, the entire pawl needs to be replaced, which is inconvenient and may cause waste of materials. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a one-way rotation structure, which can realize smooth rotation in a first direction and prevent rotation in an opposite second direction. At the same time, the structure is simple in composition and easy to repair and maintain after long-term use, so that the overall service life of the structure is long.

[0004] The utility model is realized through the following technical solutions.

[0005] A one-way rotation structure, characterized in that it includes a guide part, a clamping part and a mounting part, wherein the mounting part is used to limit the distance between the guide part and the clamping part, so that the clamping block in the clamping part is meshed with the one-way tooth block structure in the guide part with the tooth surface facing the direction of the clamping part; wherein the clamping part further includes a mounting block, a limiting rod and a limiting block, wherein the mounting block is provided with a mounting through hole, one end of the limiting rod is connected to the clamping block after passing through the mounting through hole, and the other end of the limiting rod is connected to the limiting block, and a return member is provided between the clamping block and the mounting block. When the clamping block rotates in a first direction, the clamping block can pass over the tooth block in the one-way tooth block structure, and when the clamping block rotates in a second direction opposite to the first direction, the clamping block is meshed with the tooth block.

[0006] When the engaging block is in the working state, it meshes with the one-way tooth block structure. When the engaging block is driven to rotate in the first direction, the engaging block can pass over the tooth block. In this process, the engaging block first approaches the position of the mounting block. At this time, the homing component is compressed and potential energy is accumulated. After passing over the tooth block, the homing component can drive the engaging block away from the mounting block until the limit block conflicts with the mounting block or the engaging block conflicts with the one-way tooth block structure. At this time, the engaging block completes the reset and re-enters the working state.

[0007] Therefore, during long-term use, if the locking block does not return to its original position normally, it is usually caused by the performance degradation or attenuation of the homing component. The homing component is arranged between the locking block and the mounting portion, and the homing component can be replaced by simply removing the connection between the limit rod and the locking block. Under this structure, the overall repair and maintenance operation is simpler and there is no need to replace the other parts of the locking portion, so the cost involved is lower.

[0008] As a further improvement of the utility model, a positioning member is provided on the engaging portion, which is used to limit the distance between the limit block and the mounting block; the engaging block rotates along a first direction relative to the one-way tooth block structure to form a first moving path, and the positioning member includes a first guide protrusion and a second guide protrusion provided on the guide portion, wherein the first guide protrusion is placed at the starting point of the first moving path, and the second guide protrusion is placed at the end point of the first moving path, and both protrude toward the direction of the engaging portion; at the same time, the positioning member also includes a limiting kit provided on the engaging portion, which is used to limit and fix the limit block.

[0009] When the engaging block contacts the second guide protrusion, the limit block moves away from the mounting block and is restricted and fixed by the limit kit, and the engaging block is also driven away from the one-way tooth block structure. Therefore, in this case, the engaging block can rotate toward the second direction without being blocked by the tooth block, and then rotates until the engaging block contacts the first guide protrusion, and the limit kit releases the restriction on the limit block, and the engaging block is reset under the action of the return member and contacts the one-way tooth block structure again. Under this structure, the one-way rotation structure can also have the effect of rotating back to the original position and then rotating again, so as to avoid the situation where some users have difficulty in reaching the desired rotation angle after excessive rotation.

[0010] As a further improvement of the present invention, a guide surface structure is arranged on the first guide protrusion and the second guide protrusion, and the limiting kit includes a first contact surface and a second contact surface arranged in the mounting through hole; wherein a first distance is arranged between the first contact surface and the second contact surface.

[0011] The guide surface structure of the second guide protrusion can drive the limit block to move away from the mounting block beyond the first spacing and rotate at the same time, so that the limit block contacts the second contact surface. At this time, the engaging block is away from the one-way tooth block structure and close to the mounting block and is difficult to reset; the guide surface structure of the first guide protrusion can drive the limit block to rotate, so that the limit block does not contact the second contact surface, and is transformed to be close to the first contact surface again or only contacts the mounting block through the first contact surface. At this time, the engaging block and the one-way tooth block structure can also contact each other again. Under this structure, the positioning structure can achieve the cutting-in and cutting-out effects on the limiting state of the limit block.

[0012] As a further improvement of the present invention, the return member is an elastic component sleeved outside the limit rod. The limit rod can limit the pressure release direction of the elastic component to prevent the locking block from moving and deviating.

[0013] A height-adjustable chair armrest, characterized in that the armrest is installed on the chair body through any one of the above-mentioned one-way rotating structures, the guide part is connected to the armrest, and the clamping part is connected to the chair body.

[0014] As a further improvement of the present invention, the armrest includes a support portion and a supporting portion, one end of the support portion is connected to the chair body through the one-way rotating structure, and the other end is connected to the supporting portion, wherein the support portion includes a telescopic structure. The one-way rotating structure allows the armrest height to be adjusted while causing the position of the armrest angle to be offset, so the support portion with a telescopic structure can provide users with more options for height adjustment.

[0015] As a further improvement of the present invention, the support part includes an outer sleeve and an inner support member, the inner support member is provided with a guide groove, and the guide groove is provided with a plurality of fixed grooves along the guide direction; the outer sleeve is provided with a pressure guide block, and the pressure guide block is connected with a fixed block; when the pressure guide block is not subjected to pressure, the fixed block is placed in the fixed groove so that the outer sleeve is fixed to the inner support member; when the fixed block moves along the pressure direction, it disengages from the fixed groove, and the outer sleeve can move relative to the inner support member to achieve the telescopic effect of the support part.

[0016] As a further improvement of the present invention, the support portion and the supporting portion are connected by an adjusting member, and the adjusting member includes a main body portion arranged on the support portion and a connecting portion arranged on the supporting portion, and fixed protrusions are arranged on both sides of the main body portion, and a plurality of fixed recesses are continuously arranged on the connecting portion on both sides of the main body portion, so that the supporting portion can move in the horizontal direction relative to the support portion. According to the arrangement direction of the plurality of fixed recesses, the movable direction of the supporting portion is also different. Usually, the fixed recesses are arranged as a whole in the front and back, so that the supporting portion can be adjusted in the direction away from and close to the chair back.

[0017] As a further improvement of the utility model, the main body includes a limiting block and a rotating block, and the main body also includes a limiting block and a rotating block. The limiting block is fixedly mounted on the supporting part, and the rotating block is sleeved outside the limiting block. The relative position between the connecting part and the rotating block is fixed. Therefore, when the rotating block rotates relative to the limiting block, it actually drives the supporting part to rotate relative to the supporting part.

[0018] A chair, characterized in that it comprises any of the above-mentioned height-adjustable chair armrests.

[0019] The beneficial effect of the utility model is that the overall structure of the one-way rotating structure is relatively simple, which is easy to maintain and repair in the future. The maintenance and repair work only involves the replacement of a small number of parts, and the maintenance cost is low, so that the overall service life of the one-way rotating structure is relatively long. After the structure is improved, the one-way rotating structure is supported to rotate back to the original position and then re-carry out the rotation operation, so that after excessive rotation occurs, the user can re-rotate until the desired angle is adjusted. When the one-way rotating structure under the improved structure is installed in the armrest of the chair, when the armrest is raised too high, the user can re-adjust the height of the armrest until the user's needs are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings are provided for combining with the preferred implementation cases of the present invention to help understand the purpose and advantages of the present invention, wherein:

[0021] Figure 1 It is an exploded view of a one-way rotating structural part;

[0022] Figure 2 It is an exploded top view of a one-way rotating structural part;

[0023] Figure 3 This is a schematic diagram of the installation block structure;

[0024] Figure 4 It is a schematic diagram of the meshing state of the engaging block and the one-way gear block structure;

[0025] Figure 5 This is a schematic diagram of the structure of the handrail after assembly;

[0026] Figure 6 This is the exploded view of the supporting parts;

[0027] Figure 7 This is the exploded top view of the support part;

[0028] Figure 8 This is an exploded view of the supporting parts.

[0029] The reference numerals mainly include:

[0030] Guide portion 1, one-way tooth block structure 101, engaging portion 2, engaging block 201, mounting block 202, limiting rod 203, limiting block 204, mounting portion 3, positioning member 4, first guiding protrusion 401, second guiding protrusion 402, first contact surface 403, second contact surface 404;

[0031] Support part A01, outer kit A01-1, pressure guide block A01-1a, fixed block A01-1b, inner support part A01-2, guide groove A01-2a, fixed groove A01-2b, supporting part A02, adjusting member A03, main body A03-1, fixed protrusion A03-1a, limiting block A03-1b, rotating block A03-1c, connecting part A03-2, fixed recess A03-2a. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below based on the accompanying drawings and implementation cases.

[0033] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0034] Embodiment 1:

[0035] A one-way rotating structure, such as Figure 1~2As shown, it includes a guide part 1, a clamping part 2 and a mounting part 3. The guide part 1 includes a one-way tooth block structure 101, the clamping part 2 includes a clamping block 201, and the mounting part 3 is used to combine the guide part 1 with the clamping part 2. Among them, the tooth surface of the one-way tooth block structure 101 faces the direction of the clamping part 2. After the mounting part 3 controls the clamping part 2 and the guide part 1 to approach and complete the combination, the clamping block 201 can mesh with the one-way tooth block structure 101. In this embodiment, the mounting part 3 adopts the form of a screw and a nut combination, the limit block of the screw is in conflict with the guide part 1, and the nut is in conflict with the clamping part 2. When the nut and the limit block of the screw are close to each other, it will drive the guide part 1 and the clamping part 2 to approach and fit together. Meanwhile, the one-way tooth block structure 101 includes a plurality of tooth blocks, and grooves are formed between the plurality of tooth blocks. When the guide portion 1 and the engaging portion 2 are close to each other, the engaging block 201 can be placed in the groove to achieve meshing between the engaging block 201 and the one-way tooth block structure 101 .

[0036] The engaging part 2 further includes a mounting block 202, a limiting rod 203 and a limiting block 204. The mounting block 202 is provided with a mounting through hole. One end of the limiting rod 203 is connected to the engaging block 201 after passing through the mounting through hole. The other end of the limiting rod 203 is connected to the limiting block 204, so that the movement between the engaging block 201 and the limiting block 204 is synchronized. A return component is provided between the engaging block 201 and the mounting block 202. When the engaging block 201 is squeezed and approaches the mounting block 202, that is, when the engaging block 201 is away from the tooth block, the return component accumulates potential energy. When the squeezing force on the engaging block 201 disappears, the return component will push the engaging block 201 to reset until it is meshed with the unidirectional tooth block structure 101 again.

[0037] In this embodiment, a bevel structure is provided on one side of the engaging block 201, and a straight surface structure is provided on the other side; a bevel structure is provided on one side of the groove formed between the two tooth blocks, and a straight surface structure is provided on the other side, wherein the bevel structure of the engaging block 201 matches the bevel structure in the groove, and the straight surface structure of the engaging block 201 matches the straight surface structure in the groove. Influenced by the homing member, the engaging block 201 is usually placed in the groove. When the engaging block 201 in the groove rotates along the first direction, the engaging block 201 contacts the tooth block through the bevel structure, and gradually approaches the mounting block 202, and finally passes over the current tooth block. After passing over the tooth block, driven by the homing member, the engaging block 201 can enter the next groove. When the engaging block 201 rotates in the groove in a second direction opposite to the first direction, the engaging block 201 and the groove directly contact each other through the straight surface structure, and the tooth block meshes with the engaging block 201 to prevent the moving of the engaging block 201. Thus, the overall one-way rotating structure is realized.

[0038] Preferably, if Figure 4As shown, a positioning member 4 is also provided on the locking portion 2. When the limit block 204 is affected by the locking block 201 and moves beyond the corresponding distance, the positioning member 4 can restrict the limit block 204 to prevent it from moving toward the direction of the installation block 202, and simultaneously restrict the locking block 201 from resetting and engaging with the one-way tooth block structure 101.

[0039] Specifically, on the guide portion 1, the positioning member 4 mainly includes a first guide protrusion 401, a second guide protrusion 402 and a limiter kit, wherein the first guide protrusion 401 and the second guide protrusion 402 are respectively arranged at the starting point and the end point of the first moving path formed by the engaging block 201 rotating along the first direction, and both protrude toward the direction of the engaging portion 2. The limiter kit is arranged on the engaging portion 2, and is mainly used to limit and fix the limiter block 204.

[0040] After the engaging block 201 contacts the second guide protrusion 402, it is squeezed by the second guide protrusion 402 and moves away from the guide part 1. At the same time, the limit block 204 also moves away from the mounting block 202 and is restricted by the limit kit. At this time, it is difficult for the engaging block 201 to be reset by the return member, so the engaging block 201 can be driven to rotate in the second direction without obstruction. After the engaging block 201 rotates in the second direction until it contacts the first guide protrusion 401, the limit kit can be driven to release the restriction effect on the limit block 204, so that the engaging block 201 can be connected with the tooth block again.

[0041] In this embodiment, the limit kit can adopt a structure such as an electromagnet, so that the limit block 204 is restricted and fixed after moving over a certain distance, until the locking block 201 contacts the first guide protrusion 401 to release the locking state of the limit block 204. Taking the electromagnet structure as an example, after the locking block 201 contacts the second guide protrusion 402, the guide electromagnet is turned on during the process of the limit block 204 moving away from the mounting block 202, so that the limit block 204 is restricted from moving, and after contacting the first guide protrusion 401, the electromagnet switch is turned off, and the return member can drive the locking block 201 to reset again.

[0042] Preferably, if Figure 3~4 As shown, the positioning member 4 further includes a guide surface structure arranged on the first guide protrusion 401 and the second guide protrusion 402, and a first contact surface 403 and a second contact surface 404 arranged in the mounting through hole; wherein a first distance is arranged between the first contact surface 403 and the second contact surface 404.

[0043] Under normal conditions, when the engaging portion 2 is engaged with the one-way tooth block structure 101, the stopper 204 is close to or directly in contact with the first contact surface 403, and the engaging block 201 can engage with the one-way tooth block structure 101. However, when the engaging block 201 is in contact with the second guide protrusion 402, the stopper 204 can be driven to move beyond the first spacing, and the stopper 204 is forced to rotate after being affected by the guide surface structure, and finally the stopper 204 is in contact with the second contact surface 404, and the stopper 204 is in a restricted state, while the engaging block 201 is simultaneously displaced away from the one-way tooth block structure 101, and the engaging block 201 can move along the second direction. When the engaging block 201 contacts the first guiding protrusion 401 , it can drive the limiting block 204 to rotate again until the limiting block 204 is no longer in contact with the second contact surface 404 . After being affected by the returning component, the engaging block 201 is reset again and can resume the unidirectional rotation.

[0044] Preferably, the return member is an elastic component sleeved outside the limit rod 203, and a spring is used in this embodiment. At this time, the limit rod 203 has the effect of limiting the position of the spring, so as to avoid the situation that the potential energy release direction of the spring is greatly deviated during the reset process of the locking block 201, resulting in the locking block 201 not being reset to its original position.

[0045] Embodiment 2:

[0046] A height-adjustable chair armrest, such as Figure 5 As shown, the armrest is installed on the chair body through any one-way rotating structure described in Example 1, wherein the guide portion 1 is connected to the armrest, and the engaging portion 2 is connected to the chair body.

[0047] Preferably, the armrest includes a support portion A01 and a supporting portion A02, wherein one end of the support portion A01 is connected to the chair body through a one-way rotating structure, and the other end is connected to the supporting portion A02. During use, the user's arm mainly rests on the supporting portion A02. In this embodiment, the support portion A01 also includes a telescopic structure, which facilitates the user to further adjust the height position of the supporting portion A02 to meet the needs of users of different body shapes.

[0048] Preferably, if Figure 6As shown, the support part A01 includes an outer kit A01-1 and an inner support part A01-2. The outer kit A01-1 can slide relative to the inner support part A01-2, thereby affecting the overall length of the support part A01 and further adjusting the overall height of the armrest. After the outer kit A01-1 slides to a corresponding height relative to the inner support part A01-2, the outer kit A01-1 needs to be fixed to provide support for the supporting part A02. Therefore, the outer kit A01-1 needs to switch between a locked state and an unlocked state, and the inner support part A01-2 needs to provide a certain guiding effect on the sliding of the outer kit A01-1.

[0049] In this embodiment, Figure 6-7 As shown, the inner support member A01-2 is provided with a guide groove A01-2a, and four fixed grooves A01-2b are also provided in the guide groove A01-2a along the guide direction limited by itself. The outer set A01-1 is provided with a pressure guide block A01-1a, and the pressure guide block A01-1a is connected to the fixed block A01-1b. Normally, the fixed block A01-1b is placed in the fixed groove A01-2b and fits therewith, so that the outer set A01-1 is in a locked state; and the pressure guide block A01-1a guides the user to apply pressure to the structure through protrusions or marks, and when subjected to pressure, the pressure guide block A01-1a will drive the fixed block A01-1b to move along the pressure direction, driving the fixed block A01-1b out of the fixed groove A01-2b, and at this time the outer set A01-1 is in an unlocked state and can slide and move.

[0050] In this embodiment, preferably, one end of the pressure guide block A01-1a away from the pressure point may also be connected to a reset component such as a spring, so as to achieve an automatic reset effect of the pressure guide block A01-1a after the pressure disappears.

[0051] Preferably, if Figure 8 As shown, the support portion A01 and the bearing portion A02 are connected via an adjusting member A03, wherein the adjusting member A03 includes a main body portion A03-1 arranged on the support portion A01, and a connecting portion A03-2 arranged on the bearing portion A02, wherein fixing protrusions A03-1a are arranged on both sides of the main body portion A03-1, and eight fixing recesses A03-2a are continuously arranged on both sides of the main body portion A03-1 on the connecting portion A03-2, and the fixing protrusions A03-1a can be embedded in the fixing recesses A03-2a.

[0052] When the connection part A03-2 moves relative to the main body A03-1, the fixed protrusion A03-1a escapes from the current fixed recess A03-2a and is guided by the next fixed recess A03-2a in the moving path and finally falls into it. Therefore, several continuous fixed recesses A03-2a play a guiding role, limiting and guiding the horizontal movement of the connection part A03-2 relative to the main body A03-1, and at the same time, after moving to the corresponding position, the fixed protrusion A03-1a and the fixed recess A03-2a are engaged to achieve a positioning effect, thereby achieving the effect that the supporting part A02 can move relative to the supporting part A01 in the horizontal direction and be fixed after moving into position.

[0053] In this embodiment, the guide path formed by the continuous fixed recesses A03-2a can allow the supporting portion A02 to move in the direction close to and away from the chair back, so that the user can adjust the position of the supporting portion A02 in the horizontal direction according to needs.

[0054] Preferably, if Figure 8 As shown, the main body A03-1 includes a limiting block A03-1b and a rotating block A03-1c, and the limiting block A03-1b is connected to the supporting part A01, so it does not move relative to the supporting part A01, and the rotating block A03-1c is sleeved outside the limiting block A03-1b and can rotate relative to the limiting block A03-1b. In this embodiment, when the limiting block A03-1b conflicts with the inner cavity side wall of the rotating block A03-1c, the rotating block A03-1c is difficult to rotate, so the limiting block A03-1b can also limit the maximum rotation of the rotating block A03-1c. At the same time, since the supporting part A02 and the connecting part A03-2 are relatively fixed, and the relative position between the connecting part A03-2 and the rotating block A03-1c is fixed, the effect that the supporting part A02 can rotate relative to the supporting part A01 is actually achieved. Under this structure, the user can adjust the direction of the supporting part A02 according to his or her own needs.

[0055] Embodiment 3:

[0056] A chair comprises any of the height-adjustable chair armrests described in Example 2, so that the user can adjust the height of the armrests etc. according to his / her own needs, thereby improving the versatility of the chair.

[0057] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the utility model.

Claims

1. A one-way rotation structure, characterized in that: It comprises a guiding portion (1), a clamping portion (2) and a mounting portion (3), wherein the mounting portion (3) is used to limit the distance between the guiding portion (1) and the clamping portion (2), so that a clamping block (201) in the clamping portion (2) meshes with a one-way tooth block structure (101) in the guiding portion (1) and having a tooth surface facing the direction of the clamping portion (2); The engaging portion (2) further comprises a mounting block (202), a limiting rod (203) and a limiting block (204); the mounting block (202) is provided with a mounting through hole; one end of the limiting rod (203) is connected to the engaging block (201) after passing through the mounting through hole; the other end of the limiting rod (203) is connected to the limiting block (204); a return member is provided between the engaging block (201) and the mounting block (202); the return member is used to drive the engaging block (201) away from the mounting block (202) until the limiting block (204) conflicts with the mounting block (202) or the engaging block (201) conflicts with the one-way tooth block structure (101); When the engaging block (201) rotates in a first direction, the engaging block (201) can pass over the tooth block in the one-way tooth block structure (101); when the engaging block (201) rotates in a second direction opposite to the first direction, the engaging block (201) meshes with the tooth block.

2. A one-way rotation structure according to claim 1, characterized in that: The engaging portion (2) is provided with a positioning component (4) for limiting the distance between the limiting block (204) and the mounting block (202); The engaging block (201) rotates relative to the one-way tooth block structure (101) along a first direction to form a first moving path, and the positioning member (4) comprises a first guiding protrusion (401) and a second guiding protrusion (402) arranged on the guiding portion (1), wherein the first guiding protrusion (401) is located at the starting point of the first moving path, and the second guiding protrusion (402) is located at the end point of the first moving path, and both protrude toward the direction where the engaging portion (2) is located; The positioning component (4) further comprises a limiting kit arranged on the engaging portion (2) and used for limiting the limiting block (204).

3. A one-way rotation structure according to claim 2, characterized in that: The first guiding protrusion (401) and the second guiding protrusion (402) are provided with guiding surface structures, the limiting kit comprises a first contact surface (403) and a second contact surface (404) arranged in the mounting through hole, and a first distance is provided between the first contact surface (403) and the second contact surface (404); The guide surface structure of the second guide protrusion (402) can drive the limit block (204) to move away from the installation block (202) beyond the first spacing and simultaneously rotate so as to come into contact with the second contact surface, and the guide surface structure of the first guide protrusion (401) can drive the limit block (204) to rotate so that the limit block (204) approaches the first contact surface or comes into contact with the installation block (202) only through the first contact surface.

4. The one-way rotation structure according to claim 1, characterized in that: The return component is an elastic component sleeved outside the limiting rod (203).

5. A height-adjustable chair armrest, characterized in that: The armrest is installed on the chair body through a one-way rotating structure according to any one of claims 1 to 4, the guide portion (1) is connected to the armrest, and the engaging portion (2) is connected to the chair body.

6. A height-adjustable chair armrest according to claim 5, characterized in that: The armrest comprises a support portion (A01) and a bearing portion (A02), one end of the support portion (A01) is connected to the chair body via the one-way rotating structure, and the other end is connected to the bearing portion (A02), wherein the support portion (A01) comprises a telescopic structure.

7. A height-adjustable chair armrest according to claim 6, characterized in that: The support portion (A01) comprises an outer set (A01-1) and an inner support member (A01-2), the inner support member (A01-2) is provided with a guide groove (A01-2a), and the guide groove (A01-2a) is provided with a plurality of fixing grooves (A01-2b) along the guide direction; The outer set (A01-1) is provided with a pressure guide block (A01-1a), and the pressure guide block (A01-1a) is connected to a fixing block (A01-1b); When the pressure guide block (A01-1a) is not subjected to pressure, the fixed block (A01-1b) is placed in the fixed groove (A01-2b) so that the outer set (A01-1) is fixed to the inner support member (A01-2); when the fixed block (A01-1b) moves along the pressure direction, it disengages from the fixed groove (A01-2b), and the outer set (A01-1) can move relative to the inner support member (A01-2) to achieve the telescopic effect of the support part (A01).

8. The height-adjustable chair armrest according to claim 6, characterized in that: The support portion (A01) and the bearing portion (A02) are connected via an adjusting member (A03), wherein the adjusting member (A03) comprises a main body portion (A03-1) connected to the support portion (A01) and a connecting portion (A03-2) arranged on the bearing portion (A02), wherein fixing protrusions (A03-1a) are arranged on both sides of the main body portion (A03-1), and a plurality of fixing recesses (A03-2a) are continuously arranged on the connecting portion (A03-2) on both sides of the main body portion (A03-1), so that the bearing portion (A02) can move in a horizontal direction relative to the support portion (A01).

9. A height-adjustable chair armrest according to claim 8, characterized in that: The main body (A03-1) also includes a limiting block (A03-1b) and a rotating block (A03-1c), wherein the limiting block (A03-1b) is fixedly mounted on the supporting portion (A01), and the rotating block (A03-1c) is sleeved outside the limiting block (A03-1b), and the relative position between the connecting portion (A03-2) and the rotating block (A03-1c) is fixed.

10. A chair, characterized in that: A chair armrest with adjustable height comprising any one of claims 5 to 9.

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