Handrail adjusting mechanism

Abstract

The utility model relates to a handrail adjusting mechanism which comprises a cover plate, a clamp spring seat, a clamp spring and a driving shaft. One of the driving shaft and the cover plate is used for connecting a seat, and the other is used for connecting an armrest of the seat. According to the armrest adjusting mechanism provided by the embodiment of the invention, the cover plate is provided with the first through hole, and the clamp spring seat is provided with the second through hole, so that the driving shaft can directly penetrate through and is conveniently and quickly connected with the clamp spring; the driving shaft comprises a flower-shaped columnar part, a clamping spring clamping groove is formed in the circumferential direction of the flower-shaped columnar part, a clamping spring check block of the flower-shaped columnar part can rotate relative to the clamping spring, the driving shaft can pass through the clamping spring when rotating to a specific angle, and the driving shaft is limited by the clamping spring check block at other angles; and the driving shaft can be quickly butted with the cover plate and the clamp spring seat and is not easy to separate from the clamp spring, so that the convenience of connecting the armrest with the seat is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of automobile parts, and in particular to an armrest adjustment mechanism. Background Art

[0002] As part of the seat backrest, the armrest can relieve the discomfort caused by the upper limbs hanging in the air for a long time. Especially in the automotive industry, higher and higher requirements are placed on the operating comfort, durability, safety and production cost of seat armrests.

[0003] In the prior art, there is an armrest that uses an externally meshing ratchet pawl with a stepped adjustment structure. The armrest structure is relatively large in size, has low adjustment accuracy, and cannot be produced in a modular manner. This results in the armrest being relatively large in appearance and not aesthetically pleasing in shape, and cannot meet the design requirements under the current design principles of lightweight and slim automobile seats. There is also a stepless adjustment armrest that uses the principle of spiral spring friction self-locking, has limited friction torque and low strength, and cannot meet stringent requirements such as abuse tests. The operating torque of the armrest using this structure varies greatly, is not uniform, and has relatively poor comfort. There are also some armrest adjustment mechanisms that have a complex structure when connected to the seat and armrest, making it difficult to quickly complete the assembly connection. Utility Model Content

[0004] In view of this, an embodiment of the present application provides an armrest adjustment mechanism to solve at least one problem existing in the background technology.

[0005] The embodiment of the present application provides an armrest adjustment mechanism, comprising:

[0006] A cover plate, wherein the cover plate has a cavity inside and a first through hole;

[0007] A spring retaining seat is installed in the cavity, and the spring retaining seat has a second through hole;

[0008] A circlip, mounted on the circlip seat;

[0009] A driving shaft, the driving shaft passes through the first through hole and the second through hole and is connected to the clamping spring;

[0010] The drive shaft comprises a flower-shaped columnar portion, the outer wall of the flower-shaped columnar portion has a retaining spring groove along its circumference; the outer wall of the flower-shaped columnar portion has a protruding retaining spring stopper, and when the retaining spring is located in the retaining spring groove, the retaining spring can rotate along the retaining spring groove relative to the flower-shaped columnar portion to be at least in a first angle range or a second angle range:

[0011] When the retaining spring is located in the first angle range, the movement of the retaining spring stopper along the axial direction of the drive shaft is blocked by the retaining spring;

[0012] When the clamping spring is located in the second angle range, the driving shaft can move in the axial direction;

[0013] One of the driving shaft and the cover plate is used to connect to a seat, and the other is used to connect to an armrest of the seat.

[0014] In an optional embodiment, the outer wall of the flower-shaped columnar portion has at least one retaining spring guide groove along its axial direction, and the retaining spring has an inner concave portion matching the contour of the retaining spring guide groove.

[0015] When the retaining spring is located in the first angle range, the movement of the retaining spring stopper along the axial direction of the drive shaft is blocked by the inner concave portion;

[0016] When the retaining spring is located in the second angle range, the inner recess is aligned with the retaining spring guide groove, and the inner recess can move along the retaining spring guide groove, so that the drive shaft can move in the axial direction.

[0017] In an optional embodiment, one side of the retaining spring seat has a first retaining spring support block, a second retaining spring support block and a third retaining spring support block, the first retaining spring support block and the second retaining spring support block support the inner side of the retaining spring, and the third retaining spring support block supports the outer side of the retaining spring; the first retaining spring support block, the second retaining spring support block and the third retaining spring support block jointly limit the movement of the retaining spring.

[0018] In an optional embodiment, the armrest adjustment mechanism also includes a friction block, which is connected to the drive shaft and can rotate under the drive of the drive shaft, and the friction block is located in the cavity; the outer edge of the friction block abuts against the inner wall of the cover plate, so that the friction block is subjected to the friction force of the inner wall of the cover plate when rotating relative to the cover plate.

[0019] In an optional embodiment, the outer edge of the friction block has a plurality of elastic strips, and the elastic strips are in a compressed state under the restriction of the inner wall of the cover plate, and the plurality of elastic strips in the compressed state squeeze the inner wall of the cover plate.

[0020] In an optional embodiment, the armrest adjustment mechanism further includes:

[0021] a fixing plate, fixed to the cover plate and used to close one side of the cavity;

[0022] A gear block, the gear block comprising a gear block body and an outer rack portion and a boss located on the gear block body, the gear block being hinged to the fixing plate;

[0023] An elastic member, one end of which is hinged to the fixing plate, and the other end of which is in contact with the tooth block;

[0024] A driving toothed plate, the driving toothed plate is connected to the driving shaft and can rotate under the drive of the driving shaft; the driving toothed plate comprises a reversing groove and an inner rack portion, and the inner rack portion is located on the inner side of the edge of the driving toothed plate;

[0025] When the tooth block rotates relative to the driving tooth plate, it can be kept in the first position or the second position under the elastic force of the elastic member;

[0026] When the tooth block is in the first position, the outer rack part is engaged with the inner rack part to generate a damping force when the handrail rotates; when the tooth block is in the second position, the outer rack part is separated from the inner rack part to remove the damping force when the handrail rotates;

[0027] The boss extends into the reversing groove;

[0028] When the driving toothed plate is driven by the armrest to rotate relative to the fixed plate, the inner wall of the reversing groove can squeeze the boss to drive the tooth block to rotate from the first position to the second position;

[0029] When the driving tooth plate is driven by the lowering of the armrest to rotate relative to the fixed plate, the inner wall of the reversing groove can squeeze the boss to drive the tooth block to rotate from the second position to the first position.

[0030] In an optional embodiment, the armrest adjustment mechanism further includes a blocking spring, the blocking spring is installed in the driving tooth plate and is located on one side of the tooth block, and the blocking spring is elastic;

[0031] The edge of the tooth block body is formed with a hook-shaped portion, and the inner side of the edge of the driving tooth plate is also formed with a hook-shaped groove;

[0032] When the armrest is rotated to the armrest storage position of the seat, the hook portion can be embedded in the hook groove, and the blocking spring can apply elastic force to the hook portion to make the hook portion engage with the hook groove to limit the rotation of the armrest relative to the seat and keep the armrest in the armrest storage position.

[0033] In an optional embodiment, when the armrest is lifted from the flat position to the armrest storage position, the gear block sequentially goes through the following stages:

[0034] The first stage: the gear block is located at the first position;

[0035] The second stage: the gear block switches from the first position to the second position and remains in the second position;

[0036] Stage 3: the tooth block is maintained at the second position and the hook portion of the tooth block is engaged with the hook groove.

[0037] In an optional embodiment, the blocking spring is formed by bending a metal wire, and the inner wall of the driving tooth plate protrudes with a support point for the blocking spring to abut against, and the support point is located between the inner side of the edge of the driving tooth plate and the driving shaft; both sides of the blocking spring abut against the support point and the inner side of the edge of the driving tooth plate respectively, the support end of the blocking spring abuts against the outer rack part, and the elastic end is located at the opening of the hook-shaped groove, and the elastic end is the opposite end of the support end.

[0038] In an optional embodiment, the fixing plate includes a fixing plate body and a first mounting column and a second mounting column located on the fixing plate body, and the distance between the center points of the first mounting column and the second mounting column is L1;

[0039] The tooth block further comprises a mounting hole and a first limiting groove located on the main body of the tooth block, and the distance between the mounting hole and the center point of the first limiting groove is L2; ​​the tooth block is hinged to the fixing plate by being sleeved on the first mounting column through the mounting hole;

[0040] An elastic member, one end of which is hinged to the second mounting column, and the other end of which is inserted into the first limiting groove. The distance between the center points of the two ends of the elastic member when it is not deformed is L3; L3+L2>L1.

[0041] The armrest adjustment mechanism provided in the embodiment of the present application has a cover plate with a first through hole and a spring seat with a second through hole, so that the drive shaft can pass directly through, which is convenient for quick connection with the spring; the drive shaft includes a flower-shaped columnar portion, and through the arrangement of the spring groove circumferentially of the flower-shaped columnar portion, the spring stopper of the flower-shaped columnar portion can rotate relative to the spring, so that the drive shaft can pass through the spring when it rotates to a specific angle, while being limited by the spring stopper at other angles, so that the drive shaft can quickly dock with the cover plate and the spring seat, and is not easily detached from the spring, thereby improving the convenience of connecting the armrest to the seat.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0044] Figure 1 An exploded view of the parts of the armrest adjustment mechanism provided in an embodiment of the present application;

[0045] Figure 2A schematic diagram of the connection relationship between the retaining spring, retaining spring seat and driving shaft provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of the change in the rotation state of the clamping spring relative to the drive shaft provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of the connection relationship between the driving tooth plate and the tooth block in the first stage of lifting the armrest provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of the connection relationship between the drive tooth plate and the tooth block in the second stage of lifting the armrest provided in an embodiment of the present application;

[0049] Figure 6 A schematic diagram of the connection relationship between the fixing plate, the tooth block, and the elastic member provided in the embodiment of the present application;

[0050] Figure 7 A schematic diagram of the structure of the driving tooth plate provided in an embodiment of the present application;

[0051] Figure 8 This is a schematic diagram of the friction disc installation structure provided in an embodiment of the present application.

[0052] The reference numerals in the figure are:

[0053] 1. Gear block;

[0054] 1a, mounting hole; 1b, outer rack portion; 1c, boss; 1d, first limiting groove; 1e, hook portion;

[0055] 2. Elastic parts;

[0056] 2a, first hinged end; 2b, second hinged end;

[0057] 3. Fixed plate;

[0058] 3a, first mounting column; 3b, second mounting column; 3c, with positioning column; 3d, shaft mounting hole; 3e, positioning hole; 3f, positioning waist hole;

[0059] 4. Driving gear plate;

[0060] 41, tooth plate outer layer; 42, tooth plate inner layer; 43, support point; 421, reversing groove; 421a, reference surface; 421b, reversing protrusion; 421c, switching surface; 421d, reset guide surface; 422, circular through hole;

[0061] 5. Blocking spring;

[0062] 5a, support end; 5b, elastic end;

[0063] 6. Gasket;

[0064] 7. Friction block;

[0065] 7a, elastic strip;

[0066] 8. Circlip;

[0067] 8a, inner concave portion;

[0068] 9. Circlip seat;

[0069] 9a, first clamp spring support block; 9b, second clamp spring support block; 9c, third clamp spring support block;

[0070] 10. Cover plate;

[0071] 10a, inner wall of cover plate;

[0072] 11. Drive shaft;

[0073] 11a, retaining spring retaining groove; 11b, retaining spring stopper; 41a, inner rack portion; 41b, hook-shaped groove; 41c, flower-shaped hole; 111, flower-shaped columnar portion; 112, retaining spring guide groove. DETAILED DESCRIPTION

[0074] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope disclosed in the present application to those skilled in the art.

[0075] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0076] In the drawings, the size of components, mechanisms, gaps and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0077] It should be understood that when a component or mechanism is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other components or mechanisms, it can be directly on, adjacent to, connected to or coupled to other components or mechanisms, or there can be intermediate components or mechanisms. On the contrary, when a component or mechanism is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other components or mechanisms, there is no intermediate component or mechanism. It should be understood that although the terms first, second, third, etc. can be used to describe various components, mechanisms, gaps and / or parts, these components, mechanisms, gaps and / or parts should not be limited by these terms. These terms are only used to distinguish one component, mechanism, gap or part from another component, mechanism, gap or part. Therefore, without departing from the teachings of the present application, the first component, mechanism, gap or part discussed below can be expressed as the second component, mechanism, gap or part. And when the second component, mechanism, gap or part is discussed, it does not indicate that the present application necessarily has the first component, mechanism, gap or part.

[0078] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein for convenience of description to describe the relationship of one component or feature shown in the figures to other components or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is turned over, then the components or features described as "under the other components" or "beneath" or "below" will be oriented as "above" the other components or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The components may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0079] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0080] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0081] The present application embodiment provides an armrest adjustment mechanism, such as Figure 1-Figure 3 As shown, it includes: a cover plate 10, a spring seat 9, a spring 8, and a drive shaft 11. One of the drive shaft 11 and the cover plate 10 is used to connect the seat, and the other is used to connect the armrest of the seat. In this embodiment, the drive shaft 11 is connected to the armrest, and the cover plate 10 is connected to the seat as an example for description.

[0082] The cover plate 10 has a cavity inside, and the cover plate 10 has a first through hole; a retaining spring seat 9 is installed in the cavity, and the retaining spring seat 9 has a second through hole; a retaining spring 8 is installed on the retaining spring seat 9; and a drive shaft 11 passes through the first through hole and the second through hole to be connected with the retaining spring 8.

[0083] The drive shaft 11 includes a flower-shaped columnar portion 111, and the outer wall of the flower-shaped columnar portion 111 has a retaining spring groove 11a along its circumference; the outer wall of the flower-shaped columnar portion 111 has a protruding retaining spring stopper 11b, and when the retaining spring 8 is located in the retaining spring groove 11a, the retaining spring 8 can rotate along the retaining spring groove 11a relative to the flower-shaped columnar portion 111 to be at least in the first angle range or the second angle range:

[0084] When the clamping spring 8 is located in the first angle range, the axial movement of the clamping spring stopper 11b along the driving shaft 11 is blocked by the clamping spring 8;

[0085] When the retaining spring 8 is located in the second angle range, the driving shaft 11 can move in the axial direction.

[0086] When the armrest adjustment mechanism of this embodiment is assembled, the spring seat 9 is installed in the cover plate 10, and the drive shaft 11 can directly pass through the first through hole of the cover plate 10 and the second through hole of the spring seat 9 until the spring groove 11a of the flower-shaped columnar portion 111 is aligned with the spring 8 in the radial direction. Figure 3 As shown, the drive shaft 11 is rotated by a certain angle, so that the movement of the spring stopper 11b along the axial direction of the drive shaft 11 is blocked by the spring 8. At this time, the drive shaft 11 cannot move along its axial direction. When the cover 10 is fixed to the seat, the drive shaft 11 is also fixed accordingly, and the armrest can be fixed to one end of the drive shaft 11. It can be understood that the spring stopper 11b needs a sufficient area to ensure that the armrest can be blocked by the spring 8 within the angle range of rotation. The specific area, angle or position of the spring stopper 11b is adjusted according to the actual needs of different seats.

[0087] In the armrest adjustment mechanism of the embodiment of the present application, the cover plate 10 has a first through hole and the retaining spring seat 9 has a second through hole, so that the drive shaft 11 can pass directly through, which is convenient for quick connection with the retaining spring 8; the drive shaft 11 includes a flower-shaped columnar portion 111, and through the arrangement of the retaining spring groove 11a circumferentially of the flower-shaped columnar portion 111, the retaining spring stopper 11b of the flower-shaped columnar portion 111 can rotate relative to the retaining spring 8, so that the drive shaft 11 can pass through the retaining spring 8 when it rotates to a specific angle (not blocked by the retaining spring stopper 11b), while being limited by the retaining spring stopper 11b at other angles, so that the drive shaft 11 can quickly dock with the cover plate 10 and the retaining spring seat 9, and is not easy to detach from the retaining spring 8, thereby improving the convenience of connecting the armrest to the seat.

[0088] In an optional embodiment, if Figure 2 As shown, the outer wall of the flower-shaped columnar portion 111 has at least one retaining spring guide groove 112 along its axial direction, and the retaining spring 8 has an inner concave portion 8a matching the contour of the retaining spring guide groove 112.

[0089] like Figure 3 As shown, when the retaining spring 8 is located in the first angle range, the movement of the retaining spring stopper 11b along the axial direction of the driving shaft 11 is blocked by the inner recess 8a;

[0090] like Figure 3 As shown, when the circlip 8 is located in the second angle range, the inner concave portion 8a is aligned with the circlip guide groove 112, and the inner concave portion 8a can move along the circlip guide groove 112, so that the drive shaft 11 can move in the axial direction. In other words, when the circlip 8 is located in the second angle range, the drive shaft 11 can be removed from the circlip seat 9 in the axial direction. On the contrary, when the drive shaft 11 is axially connected to the circlip seat 9, the circlip 8 is located in the second angle range when it is inserted into the circlip guide groove 112.

[0091] In this embodiment, the shape of the retaining spring 8 is designed with an inner recess 8a to facilitate cooperation with the retaining spring stopper 11b. At the same time, the inner recess 8a can also move along the retaining spring guide groove 112, so that the drive shaft 11 is guided when passing through the middle of the retaining spring 8, which is conducive to installation.

[0092] In an optional embodiment, if Figure 2 , Figure 3 As shown, one side of the retaining spring seat 9 has a first retaining spring support block 9a, a second retaining spring support block 9b and a third retaining spring support block 9c, the first retaining spring support block 9a and the second retaining spring support block 9b support the inner side of the retaining spring 8, and the third retaining spring support block 9c supports the outer side of the retaining spring 8; the first retaining spring support block 9a, the second retaining spring support block 9b and the third retaining spring support block 9c jointly limit the movement of the retaining spring 8.

[0093] In this embodiment, a structure of multiple support blocks is formed on one side of the retaining spring seat 9, which facilitates the fixing of the special-shaped retaining spring 8 and limits the rotation of the retaining spring 8 to prevent the retaining spring 8 from being unable to align normally with the retaining spring guide groove 112 or the retaining spring stopper 11b.

[0094] In an optional embodiment, if Figure 4-Figure 7 As shown, the armrest adjustment mechanism further includes: a fixing plate 3, a tooth block 1, an elastic member 2 and a driving tooth plate 4.

[0095] The fixing plate 3 is fixed to the cover plate 10 and is used to close one side of the cavity;

[0096] The gear block 1 comprises a gear block body, an outer rack portion 1b and a boss 1c located on the gear block body, and the gear block 1 is hinged to the fixing plate 3;

[0097] One end of the elastic member 2 is hinged to the fixed plate 3, and the other end is in contact with the gear block 1;

[0098] The driving toothed plate 4 is connected to the driving shaft 11 and can rotate under the drive of the driving shaft 11; the driving toothed plate 4 includes a reversing groove 421 and an inner rack portion 41a, and the inner rack portion 41a is located on the inner side of the edge of the driving toothed plate 4;

[0099] The tooth shape of the inner rack portion 41a matches the tooth shape of the outer rack portion 1b, and when the tooth block 1 rotates relative to the driving tooth plate 4, it can be maintained in the first position or the second position under the elastic force of the elastic member 2;

[0100] When the tooth block 1 is in the first position, the outer rack portion 1b engages with the inner rack portion 41a to generate a damping force when the handrail rotates; when the tooth block 1 is in the second position, the outer rack portion 1b separates from the inner rack portion 41a to remove the damping force when the handrail rotates;

[0101] The boss 1c extends into the reversing groove 421. The function of this structure is to design a specific curve on the inner wall of the reversing groove 421 so that during the rotation of the driving tooth plate 4, the inner wall of the reversing groove 421 can squeeze the boss 1c to switch the tooth block 1 from the first position to the second position or from the second position to the first position;

[0102] When the driving toothed plate 4 is driven by the lifting of the handrail to rotate relative to the fixed plate 3, the inner wall of the reversing groove 421 can squeeze the boss 1c to drive the tooth block 1 to rotate from the first position to the second position;

[0103] When the driving toothed plate 4 is driven by the lowering of the armrest to rotate relative to the fixed plate 3, the inner wall of the reversing groove 421 can squeeze the boss 1c to drive the tooth block 1 to rotate from the second position to the first position.

[0104] In this embodiment, the fixing plate 3 is used as a base plate for mounting other parts, and the tooth block 1 and the driving tooth plate 4 cooperate with each other to generate or not generate damping force at different stages during the mutual rotation of the two. When the armrest adjustment mechanism of this embodiment is applied between the seat and the armrest, the damping force can be generated to achieve the armrest to suspend at a specific angle under the action of damping, and the armrest can be rotated more labor-saving and easy to operate without damping. A flower-shaped hole can be set in the center of the driving tooth plate 4 so as to connect and transmit with the driving shaft 11.

[0105] In an optional embodiment, if Figure 1 , Figure 4 , Figure 5 As shown, the armrest adjustment mechanism further includes a blocking spring 5, which is installed in the driving tooth plate 4 and located on one side of the tooth block 1, and the blocking spring 5 is elastic;

[0106] like Figure 6 As shown, the edge of the tooth block body is formed with a hook-shaped portion 1e, as shown in FIG. Figure 4 , Figure 7 As shown, a hook-shaped groove 41b is also formed on the inner side of the edge of the driving tooth plate 4;

[0107] When the armrest is rotated to the armrest storage position of the seat, the hook portion 1e can be embedded in the hook groove 41b, and the blocking spring 5 can apply elastic force to the hook portion 1e to make the hook portion 1e engage with the hook groove 41b, so as to limit the rotation of the armrest relative to the seat and keep the armrest in the armrest storage position.

[0108] In this embodiment, the rotation range of the armrest is between the flat position and the armrest storage position. The flat position refers to the armrest rotating to the lowest position, that is, the lowest position that the user's wrist can touch, and the armrest storage position refers to the armrest rotating to the highest position, that is, the position where the armrest is stored. If the user wants to rotate the armrest in the flat position to the armrest storage position, the user needs to lift the armrest.

[0109] The hook-shaped portion 1e cooperates with the hook-shaped groove 41b to fix the armrest. When the user rotates the armrest to the armrest storage position, the hook-shaped portion 1e of the tooth block 1 is inserted into the hook-shaped groove 41b of the driving tooth plate 4. Under the elastic force of the blocking spring 5, the hook-shaped portion 1e cannot be separated from the hook-shaped groove 41b under the weight of the armrest. The cooperation of this structure can keep the armrest in the armrest storage position, and prevent the armrest from being separated from the armrest storage position under the action of shaking or gravity, which affects normal use.

[0110] In an optional embodiment, in the armrest adjustment mechanism of this embodiment, when the armrest is lifted from the flat position to the armrest storage position, the gear block 1 sequentially goes through the following stages:

[0111] The first stage: the gear block 1 is located at the first position;

[0112] The second stage: the gear block 1 switches from the first position to the second position and remains in the second position;

[0113] The third stage: the gear block 1 is maintained at the second position and the hook portion 1 e of the gear block 1 is engaged with the hook groove 41 b .

[0114] In this embodiment, by designing the matching relationship between the tooth block 1 and the driving tooth plate 4, the user's experience of the armrest when it is lifted from the horizontal position to the armrest storage position will change differently. Among them, when the tooth block 1 passes through the first stage, there will be a damping feeling when the handrail rotates, and the armrest is damped so that its own gravity is offset, and the armrest can hover at the position adjusted by the user; when the tooth block 1 passes through the second stage, the handrail rotation will be significantly reduced or there will be no damping feeling, and the user will feel more labor-saving when using it; when the tooth block 1 passes through the third stage, the armrest is fixed in the armrest storage position, which improves the convenience of storage. The various stages of the whole process are smoothly connected, and the user's operation experience is better.

[0115] In an optional embodiment, if Figure 1 , Figure 4 As shown, the blocking spring 5 is formed by bending a metal wire, which is easy to manufacture and has controllable cost. The inner wall of the driving tooth plate 4 protrudes with a support point 43 for the blocking spring 5 to abut against, and the support point 43 is located between the inner side of the edge of the driving tooth plate 4 and the driving shaft 11; the two sides of the blocking spring 5 abut against the support point 43 and the inner side of the edge of the driving tooth plate 4 respectively, the support end 5a of the blocking spring 5 abuts against the outer rack part 1b, and the elastic end 5b is located at the opening of the hook-shaped groove 41b, and the elastic end 5b is the opposite end of the support end 5a.

[0116] In this embodiment, a low-cost blocking spring 5 is provided. The blocking spring 5 is formed by bending a metal wire. Figure 4The armrest 5 is in the shape of an arch, and is supported by the support point 43, the end of the outer rack part 1b and the inner side of the edge of the driving tooth plate 4, so that the position of the blocking spring 5 is stable and not easy to be displaced. Among them, the teeth at the end of the outer rack part 1b are used to abut against the support end 5a, which greatly improves the load-bearing capacity of the elastic end 5b, so that the elastic end 5b can better apply sufficient elastic force to the hook-shaped part 1e. When the handrail is lifted up and is about to reach the armrest storage position shown, the elastic end 5b is deformed to make the opening of the hook-shaped groove 41b unobstructed. At the same time, the elastic end 5b also has a certain guiding effect on the hook-shaped part 1e, so that the hook-shaped part 1e is easier to embed into the hook-shaped groove 41b, and the deformed elastic end 5b generates elastic force to squeeze one side of the hook-shaped part 1e to prevent the hook-shaped part 1e from detaching from the opening of the hook-shaped groove 41b. However, when the user operates the armrest with external force, due to the large enough external force, the elastic end 5b is deformed, and the hook-shaped part 1e can detach from the opening of the hook-shaped groove 41b, and the armrest can continue to rotate.

[0117] In an optional embodiment, if Figure 4-Figure 6 As shown, the fixing plate 3 includes a fixing plate body and a first mounting column 3a and a second mounting column 3b located on the fixing plate body, and the distance between the center points of the first mounting column 3a and the second mounting column 3b is L1;

[0118] The tooth block 1 further comprises a mounting hole 1a and a first limiting groove 1d located on the tooth block body, and the distance between the center points of the mounting hole 1a and the first limiting groove 1d is L2; ​​the tooth block 1 is hinged to the fixing plate 3 by being sleeved on the first mounting column 3a through the mounting hole 1a;

[0119] Elastic member 2, one end of the elastic member 2 is hinged to the second mounting column 3b, and the other end is inserted into the first limiting groove 1d. The distance between the center points of the two ends of the elastic member 2 when not deformed is L3; L3+L2>L1.

[0120] In this embodiment, by arranging a mounting column on the fixing plate body, the installation and rotation of the gear block 1 and the elastic member 2 are facilitated. Figure 4 , Figure 5 As shown, in this embodiment, the characteristic that the elastic member 2 has a tendency to recover its original length after being compressed is utilized, and the length design of L3+L2>L1 is combined, so that the tooth block 1 can be located at either the first position or the second position.

[0121] like Figure 4 As shown, the armrest is in a position of lifting from the horizontal position, the elastic member 2 is in a pre-stressed state, generating two-way forces F1 and F1', and the angle between the direction of the force F1 and the center line of the first mounting column 3a and the second mounting column 3b is At this time, F1 has a centrifugal radial component force, which makes the gear block 1 always press against the driving gear plate 4, and the gear block 1 is in the first position, ensuring that the outer rack part 1b and the inner rack part 41a are meshed. When the armrest is subjected to its own downward gravity and the pressure of the user's hand, the armrest adjustment mechanism always remains locked to ensure the armrest's hovering function so as to support the user's hand at the angle adjusted by the user. It can be understood that if the user applies external force to the armrest, this lock can be broken until the user removes the external force, and the armrest adjustment mechanism remains locked again.

[0122] As the armrest continues to rise, Figure 5 As shown, as the driving tooth plate 4 rotates, the angle Gradually decrease until The angle becomes negative, driving the gear block 1 to switch from the first position to the second position, the outer rack portion 1b of the gear block 1 is separated from the inner rack portion 41a, and the armrest adjustment mechanism is in the unlocked state. At this time, under the action of the tension of the elastic member 2, the gear block 1 enters Figure 5 As shown in the stress state. Figure 5 As shown, the elastic member 2 is always in a pre-stressed state, generating two-way forces F2 and F2'. The direction of the force F2 forms an angle with the center line of the first mounting column 3a and the second mounting column 3b of At this time, F2 has a centripetal radial component force, which keeps the outer rack portion 1b of the gear block 1 separated from the inner rack portion 41a.

[0123] In an optional embodiment, if Figure 8 As shown, the armrest adjustment mechanism also includes a friction block 7, which is connected to the drive shaft 11 and can rotate under the drive shaft 11, and the friction block 7 is located in the cavity; the outer edge of the friction block 7 abuts against the inner wall 10a of the cover plate 10, so that the friction block 7 is subjected to the friction force of the inner wall 10a of the cover plate when rotating relative to the cover plate 10.

[0124] In this embodiment, the role of the friction force is to supplement the damping force when the armrest rotates, so as to avoid the situation where the armrest feels too loose when it rotates. Especially in the second stage, since the damping force of the tooth block 1 and the driving tooth plate 4 is removed, the damping force of the armrest is greatly reduced. At this time, the friction force between the friction block 7 and the inner wall 10a of the cover plate can be used to supplement the damping feeling when the armrest rotates.

[0125] In an optional embodiment, if Figure 8As shown, the outer edge of the friction block 7 has a plurality of elastic strips 7a, and the elastic strips 7a are in a compressed state under the restriction of the cover plate inner wall 10a of the cover plate 10, and the plurality of elastic strips 7a in the compressed state squeeze the cover plate inner wall 10a. In this embodiment, the structure of the elastic strips 7a is utilized to provide pressure between the cover plate inner wall 10a and the friction block 7 to generate friction between the two.

[0126] In an optional embodiment, if Figure 7 As shown, the driving tooth plate 4 includes a tooth plate outer layer 41 and a tooth plate inner layer 42, the tooth plate inner layer 42 is embedded in the tooth plate outer layer 41, the reversing groove 421 is formed in the tooth plate inner layer 42, and the inner rack portion 41a is formed in the tooth plate outer layer 41. In this embodiment, the driving tooth plate 4 adopts a split design of the inner layer and the outer layer, which can facilitate the processing of the reversing groove 421 and the inner rack portion 41a. In other embodiments, an integrated driving tooth plate 4 can also be used.

[0127] In an optional embodiment, if Figure 7 As shown, the outer edge of the tooth plate inner layer 42 is irregularly shaped, and the inner portion of the tooth plate outer layer 41 has an embedded groove matching the outer edge of the tooth plate inner layer 42 to limit the rotation of the tooth plate inner layer 42 relative to the tooth plate outer layer 41. This edge design can ensure that the rotation of the tooth plate inner layer 42 and the tooth plate outer layer 41 is synchronous, ensuring that the reversing groove 421 and the inner rack portion 41a work normally.

[0128] In an optional embodiment, if Figure 1 As shown, the armrest adjustment mechanism further includes a gasket 6. The fixing plate 3 has an opening for mounting the end of the drive shaft 11, and the gasket 6 is sleeved in the opening. In this embodiment, the gasket 6 can buffer and stabilize the contact surface between the fixing plate 3 and the drive shaft 11, thereby preventing the drive shaft 11 from shaking too much, which is beneficial to extending the service life of the component.

[0129] In an optional embodiment, if Figure 4 , Figure 6 As shown, the elastic member 2 is a spring sheet formed by bending a metal sheet, wherein the two ends of the spring sheet are curled into a cylindrical first hinge end 2a and a second hinge end 2b, the first hinge end 2a is sleeved on the second mounting column 3b of the fixing plate 3, and the second hinge end 2b is inserted into the first limiting groove 1d. The manufacturing process of the spring sheet is simple and the cost is controllable. In other embodiments, a cylindrical linear spring can also be used to replace the spring sheet.

[0130] In an optional embodiment, if Figure 6As shown, the fixing plate 3 has positioning columns 3c, positioning holes 3e, and positioning waist-shaped holes 3f, which are convenient for alignment and assembly with the corresponding parts of the cover plate 10. It also has a shaft mounting hole 3d for assembling the drive shaft 11, wherein the gasket 6 can be installed at the circumference of the shaft mounting hole 3d.

[0131] In an optional embodiment, if Figure 7 As shown, the driving tooth plate 4 has a flower-shaped hole 41c, and the flower-shaped hole 41c and the flower-shaped columnar portion 111 of the driving shaft 11 can cooperate, so that when the driving shaft 11 rotates, it can directly drive the driving tooth plate 4 to rotate. The flower-shaped hole 41c can be opened in the outer layer 41 of the tooth plate, and the corresponding position of the inner layer 42 of the tooth plate can be opened with a flower-shaped hole 41c or a common round hole. For example, in this embodiment, Figure 7 As shown, a circular through hole 422 is provided at a corresponding position of the inner layer 42 of the tooth plate.

[0132] In an optional embodiment, if Figure 7 As shown, this embodiment provides a design of a reversing groove 421, and the inner wall of the reversing groove 421 is formed with a reference surface 421a, a reversing protrusion 421b, a switching surface 421c, and a reset guide surface 421d. The first reversing protrusion 421b is located behind the reference surface 421a along the upward rotation direction of the armrest, and the reset guide surface 421d is located behind the switching surface 421c along the downward rotation direction of the armrest; the end of the reset guide surface 421d is connected to the beginning of the reference surface 421a. Its operating principle is as follows:

[0133] When the armrest is lifted from the flat position to the armrest storage position, the gear block 1 goes through the following stages in sequence:

[0134] Stage 1: the gear block 1 is located at the first position, and the boss 1c abuts against the reference surface 421a and slides along it;

[0135] The second stage: the boss 1c is squeezed by the reversing protrusion 421b, the gear block 1 switches from the first position to the second position, and the boss 1c abuts against the switching surface 421c and slides along the switching surface 421c;

[0136] The third stage: the gear block 1 is maintained at the second position and the hook portion 1 e of the gear block 1 is engaged with the hook groove 41 b .

[0137] When the armrest is lowered from the armrest storage position to the flat position, the gear block 1 goes through the following stages in sequence:

[0138] Stage 4: the hook portion 1e of the tooth block 1 is disengaged from the hook groove 41b, the tooth block 1 is located at the second position, and the boss 1c abuts against the switching surface 421c and slides along the switching surface 421c;

[0139] Stage 5: The boss 1c moves under the guidance of the reset guide surface 421d, causing the gear block 1 to rotate, and the gear block 1 switches from the second position to the first position;

[0140] Stage 6: The boss 1c moves to the end of the reset guide surface 421d and returns to the beginning of the reference surface 421a.

[0141] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. An armrest adjustment mechanism, characterized in that: include: A cover plate (10), wherein the cover plate (10) has a cavity inside, and the cover plate (10) has a first through hole; A spring retaining seat (9) is installed in the cavity, and the spring retaining seat (9) has a second through hole; A retaining ring (8) is mounted on the retaining ring seat (9); A drive shaft (11), the drive shaft (11) passing through the first through hole and the second through hole and connected to the clamping spring (8); The drive shaft (11) comprises a flower-shaped columnar portion (111), the outer wall of the flower-shaped columnar portion (111) having a retaining spring groove (11a) along its circumference; the outer wall of the flower-shaped columnar portion (111) having a protruding retaining spring stopper (11b), when the retaining spring (8) is located in the retaining spring groove (11a), the retaining spring (8) can rotate along the retaining spring groove (11a) relative to the flower-shaped columnar portion (111) to be at least in a first angle range or a second angle range: When the retaining spring (8) is located in the first angle range, the movement of the retaining spring stopper (11b) along the axial direction of the drive shaft (11) is blocked by the retaining spring (8); When the retaining spring (8) is located in the second angle range, the drive shaft (11) can move in the axial direction; One of the driving shaft (11) and the cover plate (10) is used to connect to a seat, and the other is used to connect to an armrest of the seat.

2. The armrest adjustment mechanism according to claim 1, characterized in that: The outer wall of the flower-shaped columnar portion (111) has at least one retaining spring guide groove (112) along its axial direction, and the retaining spring (8) has an inner concave portion (8a) matching the contour of the retaining spring guide groove (112). When the retaining spring (8) is located in the first angle range, the movement of the retaining spring stopper (11b) along the axial direction of the drive shaft (11) is blocked by the inner recess (8a); When the retaining spring (8) is located in the second angle range, the inner recess (8a) is aligned with the retaining spring guide groove (112), and the inner recess (8a) can move along the retaining spring guide groove (112), so that the drive shaft (11) can move in the axial direction.

3. The armrest adjustment mechanism according to claim 1, characterized in that: One side of the retaining spring seat (9) is provided with a first retaining spring support block (9a), a second retaining spring support block (9b) and a third retaining spring support block (9c); the first retaining spring support block (9a) and the second retaining spring support block (9b) support the inner side of the retaining spring (8), and the third retaining spring support block (9c) supports the outer side of the retaining spring (8); the first retaining spring support block (9a), the second retaining spring support block (9b) and the third retaining spring support block (9c) jointly limit the movement of the retaining spring (8).

4. The armrest adjustment mechanism according to claim 1, characterized in that: The armrest adjustment mechanism also includes a friction block (7), which is connected to the drive shaft (11) and can rotate under the drive of the drive shaft (11), and the friction block (7) is located in the cavity; the outer edge of the friction block (7) abuts against the inner wall (10a) of the cover plate (10), so that the friction block (7) is subjected to the friction force of the inner wall (10a) of the cover plate when rotating relative to the cover plate (10).

5. The armrest adjustment mechanism according to claim 4, characterized in that: The outer edge of the friction block (7) has a plurality of elastic strips (7a), and the elastic strips (7a) are in a compressed state under the restriction of the cover plate inner wall (10a) of the cover plate (10). The plurality of elastic strips (7a) in the compressed state squeeze the cover plate inner wall (10a).

6. The armrest adjustment mechanism according to claim 1, characterized in that: The armrest adjustment mechanism also includes: A fixing plate (3) fixed to the cover plate (10) and used to close one side of the cavity; A gear block (1), the gear block (1) comprising a gear block main body and an outer gear rack portion (1b) and a boss (1c) located on the gear block main body, the gear block (1) being hinged to the fixing plate (3); An elastic member (2), one end of the elastic member (2) being hinged to the fixing plate (3), and the other end of the elastic member (2) being in contact with the tooth block (1); a driving toothed plate (4), the driving toothed plate (4) being connected to the driving shaft (11) and being capable of rotating under the drive of the driving shaft (11); the driving toothed plate (4) comprising a reversing groove (421) and an inner toothed rack portion (41a), the inner toothed rack portion (41a) being located on the inner side of the edge of the driving toothed plate (4); When the tooth block (1) rotates relative to the driving tooth plate (4), it can be maintained in the first position or the second position under the elastic force of the elastic member (2); When the tooth block (1) is located at the first position, the outer rack portion (1b) engages with the inner rack portion (41a) to generate a damping force when the handrail rotates; when the tooth block (1) is located at the second position, the outer rack portion (1b) separates from the inner rack portion (41a) to remove the damping force when the handrail rotates; The boss (1c) extends into the reversing groove (421); When the driving toothed plate (4) is driven by the armrest to rotate relative to the fixed plate (3), the inner wall of the reversing groove (421) can squeeze the boss (1c) to drive the toothed block (1) to rotate from the first position to the second position; When the driving toothed plate (4) is driven by the lowering of the armrest to rotate relative to the fixed plate (3), the inner wall of the reversing groove (421) can squeeze the boss (1c) to drive the tooth block (1) to rotate from the second position to the first position.

7. The armrest adjustment mechanism according to claim 6, characterized in that: The armrest adjustment mechanism further comprises a blocking spring (5), wherein the blocking spring (5) is installed in the driving tooth plate (4) and is located on one side of the tooth block (1), and the blocking spring (5) is elastic; A hook-shaped portion (1e) is formed on the edge of the tooth block body, and a hook-shaped groove (41b) is also formed on the inner side of the edge of the driving tooth plate (4); When the armrest is rotated to the armrest storage position of the seat, the hook-shaped portion (1e) can be embedded in the hook-shaped groove (41b), and the blocking spring (5) can apply elastic force to the hook-shaped portion (1e) so that the hook-shaped portion (1e) is engaged with the hook-shaped groove (41b), thereby limiting the rotation of the armrest relative to the seat and keeping the armrest in the armrest storage position.

8. The armrest adjustment mechanism according to claim 7, characterized in that: When the armrest is lifted from the flat position to the armrest storage position, the gear block (1) sequentially goes through the following stages: The first stage: the gear block (1) is located at the first position; The second stage: the gear block (1) switches from the first position to the second position and remains in the second position; The third stage: the tooth block (1) is maintained at the second position and the hook-shaped portion (1e) of the tooth block (1) is engaged with the hook-shaped groove (41b).

9. The armrest adjustment mechanism according to claim 7 or 8, characterized in that: The blocking spring (5) is formed by bending a metal wire, and a support point (43) for the blocking spring (5) to abut against is protruded from the inner wall of the driving tooth plate (4), and the support point (43) is located between the inner side of the edge of the driving tooth plate (4) and the driving shaft (11); the two sides of the blocking spring (5) respectively abut against the support point (43) and the inner side of the edge of the driving tooth plate (4), the support end (5a) of the blocking spring (5) abuts against the outer rack portion (1b), and the elastic end (5b) is located at the opening of the hook-shaped groove (41b), and the elastic end (5b) is the opposite end of the support end (5a).

10. The armrest adjustment mechanism according to claim 7 or 8, characterized in that: The fixing plate (3) comprises a fixing plate body and a first mounting column (3a) and a second mounting column (3b) located on the fixing plate body, wherein the distance between the center points of the first mounting column (3a) and the second mounting column (3b) is L1; The tooth block (1) further comprises a mounting hole (1a) and a first limiting groove (1d) located on the tooth block body, the distance between the center point of the mounting hole (1a) and the first limiting groove (1d) being L2; the tooth block (1) is hingedly connected to the fixing plate (3) by being sleeved on the first mounting column (3a) through the mounting hole (1a); An elastic member (2), one end of the elastic member (2) is hinged to the second mounting column (3b), and the other end is inserted into the first limiting groove (1d), and the distance between the center points of the two ends of the elastic member (2) when not deformed is L3; L3+L2>L1.

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