Adjusting assembly, backrest adjusting mechanism and seat

Abstract

The utility model relates to the technical field of furniture accessories, in particular to an adjusting assembly, a backrest adjusting mechanism and a seat, and the technical scheme is characterized in that the adjusting assembly comprises a clamping rail with one-way clamping teeth; the clamping module moves along the clamping track, movable clamping teeth are arranged on the clamping module, and the one-way clamping teeth clamp and lock the movable clamping teeth in the first length direction and are used for allowing the movable clamping teeth to be movably clamped to the next one-way clamping teeth in the second length direction; the unlocking component is arranged on the clamping rail and located in the second length direction, and when the clamping module abuts against the unlocking component, the movable clamping teeth and the one-way clamping teeth are mutually loosened so that the clamping module can move in the first length direction; the reset component is arranged on the clamping rail and located in the first length direction, and when the clamping module makes contact with the reset component, the movable clamping teeth and the one-way clamping teeth are clamped and matched again so that the clamping module can be locked and adjusted again, and the adjusting scheme is compact in size, easy to assemble and convenient to adjust.

Description

Technical Field

[0001] This utility model relates to the technical field of furniture accessories, and in particular to an adjustment component, a backrest adjustment mechanism, and a seat. Background Technology

[0002] As users' functional demands for furniture increase, more and more furniture products are now equipped with adjustable features. Adjustable furniture refers to furniture that can be adjusted or changed according to the user's needs. This type of furniture provides greater comfort and flexibility by adjusting the angle, height, position, or shape of certain components. It is commonly found in office environments, home living spaces, and medical facilities, and has a wide range of applications.

[0003] For example, Chinese invention patent CN111195024A discloses an office chair backrest height adjustment device, which includes a seat plate, a backrest plate, a threaded rod, two sets of fixing plates, a fixing shaft, and a transmission shaft. In this solution, the threaded rod is mainly driven by a motor to rotate, and the height of the backrest plate is adjusted under the action of the threaded rod. However, the above solution has problems such as a large overall size of the adjustment structure and difficulty in assembly, which makes the chair unable to meet the requirements of lightweight design.

[0004] Furthermore, Chinese invention patent CN212394427U discloses a backrest support structure for a seat, which includes a support upright, a backrest bracket, and a lever adjustment structure. The support upright has a backrest height adjustment hole for adjusting the backrest height. The angle is locked by operating the lever adjustment structure, thus achieving height adjustment. However, this solution suffers from difficulty in operating the adjustment structure; each adjustment requires separate operation of the lever adjustment structure, and multiple adjustments are needed to insert the lever adjustment structure into the adjustment hole, making it difficult to achieve convenient and quick adjustment.

[0005] There is still a lack of a compact, easy-to-assemble, and convenient adjustment scheme in the existing technology. Therefore, it is necessary to improve the existing technology.

[0006] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0007] This utility model provides an adjustment component, a backrest adjustment mechanism, and a seat to solve the problems of insufficient compactness, complex assembly, and inconvenient adjustment of existing adjustment components.

[0008] To achieve the above objectives, in a first aspect, this utility model provides an adjustment component using the following technical solution:

[0009] An adjustment component, comprising:

[0010] The locking track has multiple unidirectional locking teeth spaced apart;

[0011] The snap-fit ​​module is displaced along the snap-fit ​​track. The snap-fit ​​module has movable snap teeth. The one-way snap teeth are used to lock the movable snap teeth in a first length direction of the snap-fit ​​track to lock the snap-fit ​​module, and are used to allow the movable snap teeth to engage with the next one-way snap teeth in a second length direction opposite to the first length direction, so that the snap-fit ​​module can be locked and adjusted.

[0012] An unlocking component is disposed on the locking track and located in the second length direction. When the locking module abuts against the unlocking component, the movable locking tooth and the one-way locking tooth disengage from each other, so that the locking module can move toward the first length direction.

[0013] A reset component is provided on the locking track and located in the first length direction. When the locking module contacts the reset component, the movable locking teeth and the one-way locking teeth re-engage, so that the locking module is locked and adjusted again in the second length direction.

[0014] Preferably, the snap-fit ​​module includes:

[0015] The housing has a receiving cavity;

[0016] A locking block is rotatably mounted on the housing, the locking block is located in the receiving cavity, and the movable locking teeth are disposed on the side of the locking block near the opening of the receiving cavity;

[0017] An elastic element, disposed in the housing and connected to the locking block, is used to apply an elastic force to the locking block to swing outward toward the outside of the housing;

[0018] And a limiting component, which is connected to the housing and the locking block respectively, for causing the locking block to swing back and forth on both sides of the receiving cavity, or for locking the locking block in the receiving cavity.

[0019] Preferably, the locking block and the housing are engaged with relative displacement in the first length direction and the second length direction;

[0020] The limiting component includes a rotating shaft disposed on the card block, and the rotating shaft has a limiting protrusion on its circumference;

[0021] The housing has mounting holes, which include a rotating area and a locking area that are interconnected. The rotating area is used for the rotating shaft to rotate and engage; the locking area is used for the limiting protrusion to insert and engage, so as to lock the block in the receiving cavity.

[0022] Preferably, the rotating shaft is detachably mounted on the card block.

[0023] Preferably, the locking block is provided with an adjusting arm extending to the outside of the receiving cavity, the locking track has a relief groove for receiving the adjusting arm, and the unlocking component is an unlocking step, which abuts against the adjusting arm so that the limiting protrusion is inserted into the locking area.

[0024] Preferably, the locking block is provided with an adjusting arm extending to the outside of the receiving cavity, the locking track has a relief groove for receiving the adjusting arm, and the reset component is a reset step, which abuts against the adjusting arm to allow the limiting protrusion to be pulled out from the locking area.

[0025] Preferably, the elastic element is a spring sheet, and the locking block has a first locking recess and a second locking recess arranged adjacent to each other. One end of the spring sheet is fixedly connected to the housing, and the other end of the spring sheet is movably locked into the first locking recess or the second locking recess.

[0026] Secondly, this utility model provides a backrest adjustment mechanism using the following technical solution:

[0027] A backrest adjustment mechanism includes an adjustment component, a bracket, and a backrest body. The snap-fit ​​rail is disposed on the backrest body, and the snap-fit ​​module is detachably disposed on the bracket.

[0028] Preferably, the bracket has a mounting recess, the inner wall of the mounting recess has a first limiting boss, and the limiting boss has an avoidance notch; the snap-fit ​​module has a second limiting boss and a deformation support part, the second limiting boss passes through the avoidance notch and slides to abut against the back of the first limiting boss, the deformation support part abuts and supports against the front of the first limiting boss, and the inner wall of the mounting recess abuts and limits the deformation support part.

[0029] Thirdly, this utility model provides a seat with the following technical solution:

[0030] A seat, including a backrest adjustment mechanism.

[0031] Compared with the prior art, this utility model has the following advantages: First, it uses two components, a snap-fit ​​track and a snap-fit ​​module, to achieve displacement adjustment. This has the characteristics of fewer components and a compact structure. During installation, it is only necessary to install the two components on two carriers respectively to achieve assembly, making the installation method simple and convenient. On this basis, when it is necessary to adjust the structure, it is only necessary to pull the snap-fit ​​module and the snap-fit ​​track together for adjustment. Specifically, during the displacement process, on the one hand, the movable snap-fit ​​teeth and the one-way snap-fit ​​teeth engage with each other to achieve basic locking adjustment function. On the other hand, as the displacement action proceeds, by abutting the snap-fit ​​module with the unlocking component and the reset component respectively, the movable snap-fit ​​teeth and the one-way snap-fit ​​teeth can switch between two states of engagement or disengagement, so as to flexibly realize displacement adjustment action. The operation is simple and the adjustment action is quick and convenient.

[0032] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the adjustment component provided in Embodiment 1 of this utility model;

[0035] Figure 2 This is a schematic diagram of the assembly relationship of the adjustment components provided in Embodiment 1 of this utility model;

[0036] Figure 3 This is a cross-sectional view of the adjustment component provided in Embodiment 1 of this utility model;

[0037] Figure 4 This is a schematic diagram of the snap-fit ​​module provided in Embodiment 1 of this utility model;

[0038] Figure 5 This is a schematic diagram of the assembly relationship of the snap-fit ​​module provided in Embodiment 1 of this utility model;

[0039] Figure 6 This is a schematic diagram of the assembly relationship between the card block and the elastic element provided in Embodiment 1 of this utility model;

[0040] Figure 7 This is a schematic diagram of the structure of the card block in the free rotation state relative to the shell provided in Embodiment 1 of this utility model;

[0041] Figure 8 This is a schematic diagram of the structure of the card block locked inside the housing according to Embodiment 1 of this utility model;

[0042] Figure 9 This is a schematic diagram of the snap-fit ​​track provided in Embodiment 1 of this utility model.

[0043] Figure 10 This is a cross-sectional view of the snap-fit ​​module and the unlocking component provided in Embodiment 1 of this utility model when they are engaged.

[0044] Figure 11 This is a cross-sectional view of the snap-fit ​​module and the reset component provided in Embodiment 1 of this utility model when they are in conjunction;

[0045] Figure 12 This is a schematic diagram of the backrest adjustment mechanism provided in Embodiment 2 of this utility model;

[0046] Figure 13 This is a schematic diagram of the assembly relationship between the snap-fit ​​module and the bracket provided in Embodiment 2 of this utility model;

[0047] Figure 14 This is a schematic diagram of the snap-fit ​​module provided in Embodiment 2 of this utility model installed behind the bracket.

[0048] Figure label:

[0049] 1. Backrest body;

[0050] 2. Bracket; 21. Mounting recess; 22. First limiting boss; 23. Clearance notch;

[0051] 3. Snap-fit ​​rail; 31. One-way snap-fit ​​teeth; 311. Locking plane; 312. Inclined plane; 32. Clearance groove;

[0052] 4. Snap-fit ​​module; 41. Movable snap-fit ​​tooth; 42. Housing; 421. Receiving cavity; 43. Snap-fit ​​block; 431. First snap-fit ​​notch; 432. Second snap-fit ​​notch; 433. Shaft hole; 44. Elastic element; 441. Fixed section; 442. Elastic section; 443. Support section; 45. Limiting component; 451. Rotating shaft; 452. Limiting protrusion; 46. Adjusting arm;

[0053] 5. Unlocking component; 6. Reset component; 7. Mounting hole; 71. Rotation area; 72. Locking area; 8. Second limit boss; 9. Deformation support. Detailed Implementation

[0054] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0055] In the description of this utility model, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component that is centrally positioned therein. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be a component that is centrally positioned therein.

[0056] Furthermore, terms such as "long," "short," "inner," and "outer" indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of this utility model.

[0057] The following is in conjunction with the appendix Figure 1-14 The technical solution of this utility model will be further illustrated through specific implementation methods.

[0058] Example 1:

[0059] Please refer to Figure 1 This utility model provides an adjustment component, which is mainly used to drive two different furniture components to extend and retract. Therefore, it can be applied to different furniture products, such as chairs, beds, tables, etc. Its specific application scenario can be adjusted according to the actual situation. In this embodiment, the adjustment component is mainly used to extend and retract the backrest of the chair. It is understood that the example shown in this embodiment is not considered as a limitation on the setting environment of the adjustment component. No matter what installation environment the adjustment component is applied to, it is considered to fall within its protection scope.

[0060] Specifically, refer to Figure 2 and Figure 3 The adjustment component provided in this embodiment of the utility model includes a locking rail 3, a locking module 4, an unlocking component 5, and a reset component 6. The locking rail 3 is disposed in one of the sliding components of the backrest, and the locking module 4 is disposed on the other sliding component of the backrest.

[0061] The locking track 3 is arranged in the shape of a long strip, and multiple one-way locking teeth 31 are arranged along its length. Usually, the one-way locking teeth 31 are integrated with the locking track 3 to ensure that the one-way locking teeth 31 have good load-bearing capacity. It is understood that the specific number of one-way locking teeth 31 can be adjusted according to actual needs, and no specific limit is set here.

[0062] The one-way locking tooth 31 is mainly used to provide a one-way locking effect. Its principle is similar to the ratchet teeth of a ratchet. For ease of description, this embodiment makes two reference directions facing opposite directions along the length of the locking track 3, and defines them as the first length direction and the second length direction, respectively. At this time, the one-way locking tooth 31 has a locking plane 311 that is perpendicular to the first length direction and the second length direction (or nearly perpendicular; this embodiment shows a nearly perpendicular setting). An inclined plane 312 is provided at an adjacent position of the locking plane 311. The inclined plane 312 is inclined relative to the first length direction and the second length direction.

[0063] Meanwhile, the snap-fit ​​module 4 moves along the length of the snap-fit ​​track 3, and the snap-fit ​​module 4 has a movable snap-fit ​​tooth 41. The contour of the movable snap-fit ​​tooth 41 is similar to that of the one-way snap-fit ​​tooth 31. The movable snap-fit ​​tooth 41 also has a locking plane 311 and an inclined plane 312. The difference between the two is that the locking plane 311 of the movable snap-fit ​​tooth 41 is set opposite to the locking plane 311 of the one-way snap-fit ​​tooth 31.

[0064] At this time, on the one hand, the movable locking tooth 41 and the one-way locking tooth 31 can be engaged to bite together. On the other hand, when the two are in the biting state, if a pushing force is applied to them in opposite directions, the two locking planes 311 will abut against each other, thereby restricting the displacement of the locking module 4 along the locking track 3. At this time, the locking module 4 and the locking track 3 are in the locked state. If a pulling force is applied to them in opposite directions, the movable locking tooth 41 will slide into the next movable locking tooth 41 through the inclined plane 312 of the one-way locking tooth 31, thereby enabling the locking module 4 and the locking track 3 to adjust their displacement relative to each other. In this state, the locking module 4 and the locking track 3 are in the adjustment state.

[0065] In this embodiment, the one-way locking tooth 31 is configured to: lock the movable locking tooth 41 in the first length direction of the locking track 3 so as to lock the locking module 4, and allow the movable locking tooth 41 to engage with the next one-way locking tooth 31 in the second length direction opposite to the first length direction so as to lock the locking module 4 for adjustment.

[0066] Furthermore, continue to refer to Figure 2Because the length of the locking track 3 is limited, and the number of movable locking teeth 41 is also limited, the locking track 3 and the locking module 4 can be repeatedly adjusted. The unlocking component 5 is located on the locking track 3 in the second length direction. When the locking module 4 comes into contact with the unlocking component 5, the movable locking teeth 41 and the one-way locking teeth 31 disengage, allowing the locking module 4 to reset and move in the first length direction.

[0067] At the same time, the reset component 6 is disposed on the snap-fit ​​track 3 and located in the first length direction. When the snap-fit ​​module 4 contacts the reset component 6, the movable snap-fit ​​tooth 41 and the one-way snap-fit ​​tooth 31 re-engage, so that the snap-fit ​​module 4 is locked and adjusted again in the second length direction, realizing the repeated adjustment function between the snap-fit ​​track 3 and the snap-fit ​​module 4.

[0068] In this embodiment, the unlocking component 5 and the reset component 6 are located at both ends of the locking track 3, which makes full use of the length space of the locking track 3 to obtain a longer range of spacing adjustment.

[0069] In the above scheme, displacement adjustment can be achieved by using two components: the snap-fit ​​track 3 and the snap-fit ​​module 4. The number of components is small and the structure is compact. During installation, the two components can be installed on two carriers respectively to achieve assembly, which is simple and convenient. At the same time, the one-way snap-lock scheme, combined with the unlocking component 5 and the reset component 6 set at both ends of the snap-fit ​​track 3, can achieve repeated displacement extension and retraction adjustment function by pulling. The operation is simple and the adjustment action is quick and convenient.

[0070] Reference Figure 4 and Figure 5 The snap-fit ​​module 4 includes a housing 42, a snap-fit ​​block 43, an elastic element 44, and a limiting component 45. The snap-fit ​​block 43, the elastic element 44, and the limiting component 45 are disposed on or connected to the housing 42, which provides assembly positions for the various components. In this embodiment, the housing 42 is opposite to the snap-fit ​​track 3. The housing 42 has a rectangular structure and a receiving cavity 421, which opens on the side of the housing 42 facing the snap-fit ​​track 3.

[0071] The locking block 43 is rotatably disposed at the housing 42 and is located in the receiving cavity 421. In this embodiment, the limiting member 45 is connected to the housing 42 and the locking block 43 respectively. The limiting member 45 is used to make the locking block 43 swing back and forth on both sides of the receiving cavity 421, or to lock the locking block 43 in the receiving cavity 421. At this time, the locking block 43 is rotatably disposed at the housing 42 through the limiting member 45. The locking block 43 has a free end, and the free end of the locking block 43 can swing back and forth on both sides of the receiving cavity 421. At the same time, the movable locking tooth 41 is disposed on the side of the locking block 43 near the opening of the receiving cavity 421 and is located at the free end of the locking block 43.

[0072] With the above structural configuration, during the reciprocating rotation of the locking block 43, the movable locking tooth 41 can be driven to extend out of the receiving cavity 421 and engage with the one-way locking tooth 31. At this time, the locking module 4 and the locking track 3 can lock and adjust each other. Alternatively, during the reciprocating rotation of the locking block 43, the movable locking tooth 41 can be driven to move into the receiving cavity 421. At this time, the movable locking tooth 41 and the one-way locking tooth 31 can disengage from each other. At this time, the locking module 4 and the locking track 3 can be repositioned and reset. Therefore, under the action of the limiting component 45, the locking block 43 has two states: extending out of the housing 42 and being retracted into the housing 42.

[0073] Further, refer to Figure 5 and Figure 6 The elastic element 44 is disposed on the housing 42 and connected to the locking block 43. The elastic element 44 is used to apply a spring force to the locking block 43 to swing outward toward the housing 42. At this time, under the action of the elastic element 44, during the process of the movable locking tooth 41 sliding to the next one-way locking tooth 31, the elastic element 44 locks the two together.

[0074] In this embodiment, the elastic element 44 is a spring sheet. Specifically, the spring sheet includes a fixed section 441, an elastic section 442, and a support section 443 connected in sequence. The fixed section 441 is fixedly connected to the housing 42, and the support section 443 abuts against the locking block 43. The fixed section 441 and the elastic section 442 are bent excessively. When the elastic section 442 is compressed, the angle between the elastic section 442 and the fixed section 441 will decrease, and elasticity will be generated under the support of the material.

[0075] Furthermore, since the locking block 43 needs to change its function by reciprocating swing, in order to enable the spring to continuously and accurately provide elastic force to the locking block 43, the locking block 43 has a first locking notch 431 and a second locking notch 432 arranged adjacent to each other. At this time, one end of the spring is fixedly connected to the housing 42, and the support section 443 located at the other end of the spring is movably locked into the first locking notch 431 or the second locking notch 432.

[0076] Based on the above configuration, when the locking block 43 swings to the outside of the receiving cavity 421, the other end of the spring can be engaged in the first engaging notch 431. At this time, the first engaging notch 431 provides positioning support for the spring, making the structure less prone to loosening. In addition, when the locking block 43 moves into the receiving cavity 421, the other end of the spring can be engaged in the second engaging notch 432. At this time, the second engaging notch 432 can also provide positioning support for the spring, making it less likely for the spring to shift or loosen during the state adjustment process of the locking block 43, and ensuring a stable and reliable structure.

[0077] Optionally, in other embodiments, the elastic element 44 may be a spring structure. Any component that can provide stable elastic support should be included in the interpretation of the elastic element 44.

[0078] Further, refer to Figure 5 and Figure 7 To enable the locking block 43 to be adjusted to two states within the housing 42, the locking block 43 and the housing 42 are engaged with relative displacement in the first length direction and the second length direction. Based on this, the limiting component 45 includes a rotating shaft 451 disposed on the locking block 43, with both ends of the rotating shaft 451 extending from opposite sides of the locking block 43. Simultaneously, the rotating shaft 451 has a limiting protrusion 452 on its periphery. Typically, the limiting protrusion 452 is integrally connected to the rotating shaft 451. In this embodiment, the cross-sections of the rotating shaft 451 and the limiting protrusion 452 form a comma-shaped profile.

[0079] Meanwhile, the housing 42 has a mounting hole 7, which includes a rotating area 71 and a locking area 72 that are interconnected. In this embodiment, the mounting hole 7 is equivalent to coinciding the dot portions of two commas and rotating the tails of the two commas out of alignment. One comma area forms the rotating area 71, and the tail of the other comma forms the locking area 72. The locking area 72 extends along the first length direction. The rotating area 71 is used for the rotating shaft 451 to rotate, which means that the rotating shaft 451 can rotate freely within the rotating area 71. The locking block 43 can reciprocate under the support of the elastic member 44 to satisfy the degree of freedom of movement of the movable locking tooth 41 and the one-way locking tooth 31 during displacement adjustment. The locking area 72 is used for the insertion and engagement of the limiting protrusion 452. When the limiting protrusion 452 is inserted into the locking area 72, the locking block 43 is locked onto the housing 42. At this time, the locking block 43 is locked onto the housing 42, so that the subsequent resetting action of the locking module 4 and the locking track 3 can be performed.

[0080] To more intuitively compare the two states of block 43, refer to Figure 7 In the first state, the limiting protrusion 452 on the rotating shaft 451 is released outside the locking area 72, and the position of the central axis of the rotating shaft 451 is point O in the figure; while in the second state, referring to Figure 8The limiting protrusion 452 on the rotating shaft 451 is inserted into the locking area 72. At this time, the central axis of the rotating shaft 451 is located at point P in the figure. According to the figure, a displacement is formed between point O and point P in the first length direction. This displacement space is a prerequisite for the limiting protrusion 452 to lock into the locking area 72.

[0081] Based on the above configuration, by providing a locking area 72 and a rotating area 71 that are interconnected on the housing 42, the shaft can rotate within the rotating area 71 to satisfy the locking adjustment action between the movable locking tooth 41 and the one-way locking tooth 31. On the other hand, by inserting the limiting protrusion 452 into the locking area 72, the locking block 43 can rotate into the housing 42 and keep the movable locking tooth 41 and the one-way locking tooth 31 separated and disengaged. At this time, the relative position between the locking module 4 and the locking track 3 can be reset to facilitate readjustment of extension and retraction. The overall structure of the above scheme is relatively compact and the switching action is quick.

[0082] Furthermore, looking back Figure 5 The rotating shaft 451 is detachably mounted on the locking block 43. Specifically, the locking block 43 is provided with shaft holes 433 that pass through both sides. The shaft holes 433 are consistent with the cross-sectional contours of the rotating shaft 451 and the limiting protrusion 452. At this time, the rotating shaft 451 with the limiting protrusion 452 can be inserted into the shaft hole 433 to achieve detachable installation. In the above solution, the rotating shaft 451 is quick and convenient to install, which further simplifies the assembly difficulty of the locking module 4.

[0083] Further, refer to Figure 8 To enable the unlocking action between the locking track 3 and the locking module 4, an adjusting arm 46 is provided on the side of the locking block 43 facing away from the housing 42. The adjusting arm 46 is usually integrally connected with the locking block 43 to obtain good connection stability.

[0084] Based on this, refer to Figure 9 The snap-fit ​​track 3 has a clearance groove 32 for accommodating the adjustment arm 46. In this embodiment, the clearance groove 32 is located in the middle of the snap-fit ​​track 3 and breaks multiple one-way snap teeth 31. The clearance groove 32 extends to both ends of the snap-fit ​​track 3. At this time, the adjustment arm 46 extends out of the accommodating cavity 421 and is accommodated in the clearance groove 32. The clearance groove 32 can prevent the snap-fit ​​module 4 from causing structural interference to the adjustment arm 46 when it moves.

[0085] Furthermore, in combination Figure 10In this embodiment, the unlocking component 5 is an unlocking step, which abuts against the adjusting arm 46. At this time, when the adjustment range of the movable locking tooth 41 and the one-way locking tooth 31 approaches the limit, the unlocking step pushes the adjusting arm 46 to move in the first length direction so that the limiting protrusion 452 is inserted into the locking area 72. At this time, the locking block 43 is locked inside the housing 42, and the movable locking tooth 41 and the one-way locking tooth 31 are disengaged from each other. The locking module 4 can then be displaced and reset in the first length direction.

[0086] Furthermore, in this embodiment, referring to Figure 9 and Figure 11 The reset component 6 is a reset step, which abuts against the adjusting arm 46. When the locking module 4 moves to the end of the locking track 3 in the first length direction, the reset step pushes the limiting protrusion 452 toward the second direction, so that the limiting protrusion 452 is pulled out from the locking area 72. At this time, under the elastic force of the elastic member 44, the locking block 43 swings back to the outside of the housing 42, and the one-way locking tooth 31 and the movable locking tooth 41 re-engage in a moving engagement.

[0087] For ease of description, refer to Figure 10 and Figure 11 When the locking module 4 moves to point M in the figure, it means that the adjusting arm 46 is in contact with the unlocking step, and the extension length of the locking track 3 is at its maximum at this time. When the locking module 4 moves to point N in the figure, it means that the adjusting arm 46 is in contact with the reset step, and the extension length of the locking track 3 is at zero at this time. Then it can be pulled out and adjusted again.

[0088] The implementation principle of this embodiment is as follows: The snap-fit ​​module 4 starts to adjust based on one end of the snap-fit ​​track 3. By pulling the snap-fit ​​track 3, the snap-fit ​​module 4 moves toward the other end of the snap-fit ​​track 3. During this process, the elastic element 44 applies elastic force to the snap-fit ​​block 43, so that the movable snap-fit ​​tooth 41 is movablely snapped onto the one-way snap-fit ​​tooth 31. The one-way snap-fit ​​tooth 31 has a one-way limiting function, so that the snap-fit ​​module 4 can only move along the second length direction of the snap-fit ​​track 3 and is locked and adjusted.

[0089] Until the locking module 4 moves to the end of the locking track 3, the adjusting arm 46 in the locking module 4 abuts against the unlocking step, thereby inserting the limiting protrusion 452 into the locking area 72, so that the movable locking tooth 41 and the one-way locking tooth 31 can remain in a loose state for a period of time. At this time, because the one-way locking tooth 31 is no longer limiting, the locking module 4 can move back towards the first length direction of the locking track 3 and return to the initial position.

[0090] Until the adjusting arm 46 abuts against the reset step, the limiting protrusion 452 is released from the locking area 72, and the locking block 43 can be reset again under the action of the elastic element 44. The movable locking tooth 41 and the one-way locking tooth 31 are re-engaged, thus completing one locking adjustment cycle.

[0091] Example 2:

[0092] Based on Embodiment 1, features not explained in this embodiment are explained using the methods in Embodiment 1, and will not be repeated here. This embodiment provides a backrest adjustment mechanism, which includes the adjustment components in Embodiment 1, as well as a bracket 2 and a backrest body 1.

[0093] Reference Figure 12 The support 2 can be understood as the connection between the entire backrest and the seat or frame, and it is usually fixed on the seat or frame. On this basis, the backrest body 1 is slidably disposed on the support 2. In this embodiment, the support 2 has a sliding channel, and the backrest body 1 is slidably disposed in the sliding channel. At this time, the backrest body 1 can move up and down relative to the support 2.

[0094] Furthermore, the snap-fit ​​track 3 is disposed on the backrest body 1 (not shown in the figure). In this embodiment, the snap-fit ​​track 3 is integrally connected with the backrest body 1. By integrally forming with the backrest body 1, the structural connection strength is improved on the one hand, and the assembly workload of the snap-fit ​​track 3 is reduced on the other hand, making subsequent assembly more efficient.

[0095] Meanwhile, the snap-fit ​​module 4 is detachably mounted on the bracket 2 for easy assembly and maintenance. To achieve the detachable connection between the snap-fit ​​module 4 and the bracket 2, refer to... Figure 13 and Figure 14 The bracket 2 has a mounting recess 21. In this embodiment, the mounting recess 21 is set in the shape of a rectangular through hole, and the length direction of the mounting recess 21 is consistent with the length direction of the locking track 3. The length of the mounting recess 21 is greater than the length of the housing 42, and the mounting recess 21 is provided through one side wall of the bracket 2.

[0096] In addition, the inner wall of the mounting recess 21 has a first limiting boss 22. The first limiting boss 22 is usually integrally connected with the bracket 2. The first limiting boss 22 is also provided with a clearance notch 23 that runs through both sides. At the same time, the snap-fit ​​module 4 has a second limiting boss 8. Specifically, the second limiting boss 8 and the deformation support part 9 are integrally provided on the outer peripheral surface of the housing 42, and the second limiting boss 8 and the clearance notch 23 are arranged opposite to each other.

[0097] At this time, the second limiting boss 8 can be inserted into and pass through the clearance notch 23 from the side of the mounting recess 21 away from the backrest body 1. At this time, the second limiting boss 8 can enter the side of the clearance notch 23 away from the housing 42, and the housing 42 can also enter the mounting recess 21 at the same time. Then, the housing 42 is pushed to slide along the second direction, so that the second limiting boss 8 slides to abut against the back of the first limiting boss 22. The first limiting boss 22 is equivalent to limiting the second limiting boss 8, so that the housing cannot be pulled out from the mounting recess 21.

[0098] Based on this, the snap-fit ​​module 4 also has a deformation support 9. In this embodiment, the deformation support 9 adopts a frame structure, and there is a hollow structure between one side of the deformation support 9 and the housing 42. At this time, the deformation support 9 can elastically deform relative to the housing 42. During the process of installing the housing 42 into the mounting recess 21, the deformation support 9 abuts against the outer wall of the bracket 2. At this time, as the pressing force increases, the deformation support 9 deforms and provides movement space for the housing 42, so that the deformation support 9, the housing 42 and the second limiting boss 8 can enter the mounting recess 21 together.

[0099] Furthermore, after the deformation support 9 is inserted into the mounting recess 21, the deformation support 9 becomes detached from the outer wall of the bracket 2, thereby allowing the deformation support 9 to reset itself and abut against the front of the first limiting boss 22; this is equivalent to the deformation support 9 and the second limiting boss 8 simultaneously clamping the first limiting boss 22, thus achieving structural fixation.

[0100] Furthermore, in this embodiment, the outer periphery of the deformable support 9 is adapted to the inner edge size of the mounting recess, further enabling the inner wall of the mounting recess 21 to abut and limit the deformable support 9, thereby realizing the assembly of the snap-fit ​​module 4. When it is necessary to disassemble the snap-fit ​​module 4, it is only necessary to re-press the deformable support 9 and deform it, and then slide the housing 42 to move the second limiting boss 8 back to the avoidance notch 23, thus realizing disassembly. The assembly process is simple and does not require the use of screwdrivers or other tools.

[0101] The implementation principle of this embodiment is to adopt a separate module disassembly and assembly scheme, which makes the structural assembly process simple and quick, and greatly reduces the difficulty of setting up the backrest adjustment mechanism.

[0102] Example 3:

[0103] This embodiment discloses a seat, including the backrest adjustment mechanism in Embodiment 2, which has the advantages of easy backrest installation and convenient adjustment.

[0104] Therefore, the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adjustment component, characterized in that, include: The locking track (3) has multiple unidirectional locking teeth (31) spaced apart; The snap-fit ​​module (4) is displaced along the snap-fit ​​track (3). The snap-fit ​​module (4) has movable snap teeth (41). The one-way snap teeth (31) are used to lock the movable snap teeth (41) in the first length direction of the snap-fit ​​track (3) so that the snap-fit ​​module (4) is locked. They are also used to allow the movable snap teeth (41) to engage with the next one-way snap teeth (31) in the second length direction opposite to the first length direction so that the snap-fit ​​module (4) can be locked and adjusted. The unlocking component (5) is disposed on the locking track (3) and located in the second length direction. When the locking module (4) abuts against the unlocking component (5), the movable locking tooth (41) and the one-way locking tooth (31) disengage from each other, so that the locking module (4) can move toward the first length direction. And a reset component (6) is provided on the snap-fit ​​track (3) and located in the first length direction. When the snap-fit ​​module (4) contacts the reset component (6), the movable snap-fit ​​tooth (41) and the one-way snap-fit ​​tooth (31) re-engage, so that the snap-fit ​​module (4) is locked and adjusted again in the second length direction.

2. The adjustment component according to claim 1, characterized in that, The snap-fit ​​module (4) includes: The housing (42) has a receiving cavity (421); A locking block (43) is rotatably disposed on the housing (42), the locking block (43) is located in the receiving cavity (421), and the movable locking tooth (41) is disposed on the side of the locking block (43) near the opening of the receiving cavity (421); An elastic element (44) is disposed in the housing (42) and connected to the locking block (43) for applying an elastic force to the locking block (43) to swing outward toward the housing (42); And a limiting component (45), which is connected to the housing (42) and the locking block (43) respectively, for making the locking block (43) swing back and forth on both sides of the receiving cavity (421), or for locking the locking block (43) in the receiving cavity (421).

3. The adjustment component according to claim 2, characterized in that: The locking block (43) and the housing (42) are relatively displaced and engaged in the first length direction and the second length direction; The limiting component (45) includes a rotating shaft (451) disposed on the locking block (43), and the rotating shaft (451) has a limiting protrusion (452) on its periphery; The housing (42) has a mounting hole (7), which includes a rotating area (71) and a locking area (72) that are interconnected. The rotating area (71) is used for the rotating shaft (451) to rotate and engage. The locking area (72) is used for the limiting protrusion (452) to insert and engage, so as to lock the card block (43) in the receiving cavity (421).

4. The adjustment component according to claim 3, characterized in that, The rotating shaft (451) is detachably mounted on the locking block (43).

5. The adjustment component according to claim 3, characterized in that, The locking block (43) is provided with an adjusting arm (46) extending to the outside of the receiving cavity (421). The locking track (3) has a relief groove (32) for receiving the adjusting arm (46). The unlocking component (5) is an unlocking step. The unlocking step abuts against the adjusting arm (46) so that the limiting protrusion (452) is inserted into the locking area (72).

6. The adjustment component according to claim 3, characterized in that, The locking block (43) is provided with an adjusting arm (46) extending to the outside of the receiving cavity (421). The locking track (3) has a relief groove (32) for receiving the adjusting arm (46). The reset component (6) is a reset step. The reset step abuts against the adjusting arm (46) to make the limiting protrusion (452) pull out from the locking area (72).

7. The adjustment component according to claim 2, characterized in that, The elastic element (44) is a spring sheet, and the locking block (43) has a first locking recess (431) and a second locking recess (432) arranged adjacent to each other. One end of the spring sheet is fixedly connected to the housing (42), and the other end of the spring sheet is movably locked to the first locking recess (431) or the second locking recess (432).

8. A backrest adjustment mechanism, characterized in that, The device includes any one of the adjustment components of claims 1-7, and further includes a bracket (2) and a backrest body (1), wherein the snap-fit ​​rail (3) is disposed on the backrest body (1), and the snap-fit ​​module (4) is detachably disposed on the bracket (2).

9. The backrest adjustment mechanism according to claim 8, characterized in that, The bracket (2) has a mounting recess (21), and the inner wall of the mounting recess (21) has a first limiting boss (22), and the limiting boss has an avoidance notch (23); the snap-fit ​​module (4) has a second limiting boss (8) and a deformation support part (9), the second limiting boss (8) passes through the avoidance notch (23) and slides to abut against the back of the first limiting boss (22), the deformation support part (9) abuts against and supports the front of the first limiting boss (22), and the inner wall of the mounting recess (21) abuts against and limits the deformation support part (9).

10. A type of seat, characterized in that, Includes the backrest adjustment mechanism as described in claim 8.

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