Backrest angle adjusting mechanism

Abstract

The utility model belongs to the technical field of seat accessories, and provides a backrest angle adjusting mechanism which comprises a seat plate mounting seat and a backrest mounting seat which are hinged with each other, two first connecting lugs which are oppositely arranged are arranged on the seat plate mounting seat, and two second connecting lugs corresponding to the two first connecting lugs are arranged on the backrest mounting seat; the seat further comprises a locking assembly arranged at the hinged position of the seat plate mounting seat and the backrest mounting seat, the locking assembly comprises a pull rod, a first check ring, a second check ring and a handle, the pull rod penetrates through the two first connecting lugs and the two second connecting lugs, and the first connecting lugs and the second connecting lugs are arranged at the two ends of the pull rod in a protruding mode. The first check ring and the second check ring are arranged at the two ends of the pull rod respectively, the handle is arranged at the end, close to the first check ring, of the pull rod, the handle is fixedly connected with an abutting piece, the abutting piece is hinged to the pull rod, and the handle drives the abutting piece to rotate so that the abutting piece and the first check ring can be switched between abutting connection and separation. And the relative angle of the seat plate mounting seat and the backrest mounting seat is controlled to be locked and unlocked.

Description

Technical Field

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

[0002] During use, in order to accommodate the needs of different people, the angle between the backrest and the seat of a chair usually needs to be adjusted appropriately, especially for office chairs and car seats. Generally, a seat back angle adjustment device is used to achieve this purpose.

[0003] Chinese invention patent application number 201210140457.3 discloses a seat back angle adjustment device. This device includes a rotating shaft with an angle adjustment disc and a locking disc loosely fitted onto it. The opposing end faces of the angle adjustment disc and the locking disc are respectively provided with meshing teeth. The device also includes an operating mechanism for separating and engaging the angle adjustment disc and the locking disc. When locking, precise locking is achieved simply by engaging the teeth on the end face of the angle adjustment disc with the teeth on the end face of the locking disc, ensuring the stability of the seat during locking. There is no issue of synchronous coordination, which greatly reduces the precision requirements for the processing and installation of various components, facilitating processing and installation. The number of teeth on the angle adjustment disc and the locking disc can be arbitrarily set. When the number of teeth on the angle adjustment disc and the locking disc is the same, full tooth engagement can be achieved, which can greatly improve the torsional strength of the device. This device is suitable for widespread application in the field of seat accessories. The adjustment device of this scheme has a relatively complex structure, resulting in high cost. Moreover, its locking requires the engagement of teeth on the angle adjustment disc and the locking disc. Its adjustment accuracy is related to the tooth pitch, and it cannot achieve the requirement of stepless adjustment.

[0004] The technical problem to be solved by this utility model is: how to solve the problem that the existing seat back angle adjustment mechanism has a complex structure, troublesome adjustment operation and cannot achieve stepless adjustment. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a backrest angle adjustment mechanism, which has the characteristics of simple structure, convenient adjustment and stepless adjustment.

[0006] The technical solution adopted by this utility model is as follows: a backrest angle adjustment mechanism, including a seat plate mounting base and a backrest mounting base that are hinged to each other. The seat plate mounting base is provided with two oppositely arranged first connecting ears, and the backrest mounting base is provided with two oppositely arranged second connecting ears. Each first connecting ear and each second connecting ear are fitted with a corresponding clearance.

[0007] It also includes a locking assembly located at the hinge of the seat mounting base and the backrest mounting base. The locking assembly includes a pull rod, a first retaining ring, a second retaining ring, and a handle. The pull rod has two first connecting ears and two second connecting ears passing through it, and both ends of the pull rod have protruding first connecting ears and second connecting ears. The first retaining ring and the second retaining ring are respectively located at both ends of the pull rod. The handle is located at the end of the pull rod near the first retaining ring. The handle is fixedly connected to a pressing member, which is hinged to the pull rod. The handle drives the pressing member to rotate, so that the pressing member and the first retaining ring switch between contact and separation, thereby controlling the locking and unlocking of the relative angle between the seat mounting base and the backrest mounting base.

[0008] The backrest angle adjustment mechanism of this application, when the handle drives the pressing member to abut against the first retaining ring, thereby driving the pull rod and the second retaining ring to move towards the first retaining ring. Under the cooperation and compression of the first and second retaining rings, the first and second connecting ears undergo elastic deformation, making the first and second connecting ears fit tightly together. The position locking of the backrest mounting seat and the seat mounting seat can be achieved by relying on the friction between the first and second connecting ears. When the handle drives the pressing member to separate from the first retaining ring, the pull rod and the second retaining ring reset, and the first and second connecting ears return to their original state, so that the backrest mounting seat and the seat mounting seat can rotate freely to adjust the angle. It has the characteristics of simple and reliable structure, convenient adjustment and stepless adjustment.

[0009] In some embodiments, a limit post is provided on the pull rod, and a limit groove corresponding to the limit post is provided on the pressing member. The limit groove is arc-shaped.

[0010] By adopting the above technical solution, the rotation range of the handle and the pressing part can be limited by the cooperation of the limiting post and the limiting groove, so as to make it easier to hold the handle during adjustment, reduce the range of handle free rotation, and improve adjustment efficiency.

[0011] In some implementations, the first retaining ring and the second retaining ring are clearance-fitted with the tie rod.

[0012] The above technical solution facilitates the installation of the first and second retaining rings and also facilitates the axial movement of the tie rod.

[0013] In some embodiments, an anti-detachment component is provided at the end of the pull rod near the second retaining ring. The anti-detachment component is located on the side of the second retaining ring away from the first retaining ring, and the anti-detachment component is detachably connected to the pull rod.

[0014] By adopting the above technical solution, the anti-detachment component can prevent the second retaining ring from falling off the pull rod. Setting the anti-detachment component and the pull rod as a detachable connection can facilitate assembly.

[0015] In some embodiments, the locking assembly further includes a sleeve fitted onto the surface of the lever, with two second connecting ears disposed outside the two first connecting ears, and the sleeve disposed between the two first connecting ears. In the locked state, both ends of the sleeve abut against the two first connecting ears respectively. In the unlocked state, the length of the sleeve is less than the distance between the two first connecting ears.

[0016] With the above technical solution, in the locked state, the two ends of the sleeve abut against the two first connecting ears, which can prevent the first connecting ears and the second connecting ears from being excessively deformed due to pressure, so that the first connecting ears and the second connecting ears can be restored to their original state after unlocking.

[0017] In some embodiments, the end of the pressing member near the first retaining ring is an outwardly protruding arc surface.

[0018] By adopting the above technical solution, the contact surface between the pressing member and the first retaining ring is set as an outwardly protruding arc surface, which can reduce the friction between the pressing member and the first retaining ring during relative movement, and make it easier for the handle to drive the pressing member to rotate.

[0019] In some embodiments, an arcuate groove is provided on the first connecting lug for sliding of the pull rod.

[0020] By adopting the above technical solution and setting the arc groove, the backrest mounting seat can not only rotate around the pull rod to adjust the relative angle between the backrest mounting seat and the seat mounting seat, but also slide along the arc groove with the pull rod to adjust the relative angle, thus allowing the backrest angle adjustment to have a larger range.

[0021] In some embodiments, a reset assembly is also included, which includes a reset shaft and a connecting rod. The reset shaft is rotatably connected to the base plate mounting seat. One end of the connecting rod is connected to a pull rod, and the other end is connected to the reset shaft. The reset shaft is connected to a reset element.

[0022] Using the above technical solution, after the pressing part separates from the first retaining ring, the reset shaft is pushed to reset under the action of the reset part, thereby driving the connecting rod and the backrest mounting seat to slide and reset along the arc groove.

[0023] In some implementations, the reset element is a torsion spring or a compression spring.

[0024] The above technical solution uses a torsion spring or compression spring to drive the reset, which has a simple structure and helps to reduce costs.

[0025] In some implementations, there are several connecting rods, and each connecting rod is spaced apart along the axial direction of the tie rod.

[0026] By adopting the above technical solution, the connecting rod is made into multiple thin parts, which can ensure the overall strength of the connecting rod, while avoiding the problem that the thickness of a single connecting rod is too large and will affect the extrusion deformation of the first connecting lug and the second connecting lug. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the backrest angle adjustment mechanism according to a preferred embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the backrest angle adjustment mechanism from another perspective;

[0029] Figure 3 for Figure 1 A schematic diagram of the backrest angle adjustment mechanism from another perspective;

[0030] Figure 4 for Figure 1 The diagram shows a structural schematic of the backrest angle adjustment mechanism from another perspective, where the backrest mounting base is not shown.

[0031] Figure 5 for Figure 4 The diagram shows a structural schematic of the backrest angle adjustment mechanism from another perspective, where the backrest mounting base is not shown.

[0032] Figure 6 This is a diagram showing the state of the locking assembly when the pressing member abuts against the first retaining ring.

[0033] Figure 7 for Figure 6 The diagram shows the structure of the handle, the pressing member, and the first retaining ring when the pressing member abuts against the first retaining ring.

[0034] Figure 8 This is a cross-sectional diagram of the backrest angle adjustment mechanism along the axis of the pull rod.

[0035] Figure 9 A schematic diagram of the structure of the mounting base for the base plate.

[0036] In the diagram: 100, backrest angle adjustment mechanism; 10, seat plate mounting base; 11, first connecting ear; 12, arc groove; 20, backrest mounting base; 21, second connecting ear; 30, locking assembly; 31, pull rod; 311, limit post; 32, first retaining ring; 33, second retaining ring; 34, handle; 35, pressing part; 351, limit groove; 36, anti-detachment part; 37, sleeve; 40, reset assembly; 41, reset shaft; 42, connecting rod. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Please see Figures 1 to 9 A preferred embodiment of the present invention provides a backrest angle adjustment mechanism 100, comprising a seat mounting base 10 and a backrest mounting base 20 hinged together. The seat mounting base 10 has two opposing first connecting ears 11, and the backrest mounting base 20 has two opposing second connecting ears 21. Each first connecting ear 11 and each second connecting ear 21 are fitted with a clearance. The backrest angle adjustment mechanism 100 further includes a locking assembly 30 disposed at the hinge point between the seat mounting base 10 and the backrest mounting base 20. The locking assembly 30 includes a pull rod 31, a first retaining ring 32, and a second retaining ring 33. The pull rod 31 has two first connecting ears 11 and two second connecting ears 21, and both ends of the pull rod 31 have protruding first connecting ears 11 and second connecting ears 21. The first retaining ring 32 and the second retaining ring 33 are respectively set at both ends of the pull rod 31. The handle 34 is set at the end of the pull rod 31 near the first retaining ring 32. The handle 34 is fixedly connected to a pressing member 35, which is hinged to the pull rod 31. The handle drives the pressing member 35 to rotate, so that the pressing member 35 and the first retaining ring 32 switch between contact and separation, thereby controlling the locking and unlocking of the relative angle between the seat plate mounting base 10 and the backrest mounting base 20.

[0041] The backrest angle adjustment mechanism 100 of this application, when the handle drives the pressing member 35 to abut against the first retaining ring 32, thereby driving the pull rod 31 and the second retaining ring 33 to move towards the first retaining ring 32. Under the combined compression of the first retaining ring 32 and the second retaining ring 33, the first connecting ear 11 and the second connecting ear 21 undergo elastic deformation, making the first connecting ear 11 and the second connecting ear 21 fit tightly together. The position locking of the backrest mounting seat 20 and the seat mounting seat 10 can be achieved by the friction between the first connecting ear 11 and the second connecting ear 21. When the handle drives the pressing member 35 to separate from the first retaining ring 32, the pull rod 31 and the second retaining ring 33 reset, and the first connecting ear 11 and the second connecting ear 21 return to their original state, so that the backrest mounting seat 20 and the seat mounting seat 10 can rotate freely to adjust the angle. It has the characteristics of simple and reliable structure, convenient adjustment and stepless adjustment.

[0042] like Figure 6 and Figure 7 As shown, a limiting post 311 is provided on the pull rod 31, and a limiting groove 351 corresponding to the limiting post 311 is provided on the pressing member 35. The limiting groove 351 is arc-shaped. The cooperation between the limiting post 311 and the limiting groove 351 can limit the rotation range of the handle 34 and the pressing member 35, so as to facilitate gripping the handle 34 during adjustment, reduce the range of free rotation of the handle 34, and improve adjustment efficiency.

[0043] Preferably, in order to facilitate the operation of the pressing member 35, the handle 34 is set at an angle to the pressing member 35.

[0044] like Figure 8 As shown, in this embodiment, the first retaining ring 32 and the second retaining ring 33 are clearance-fitted with the pull rod 31. This facilitates the installation of the first retaining ring 32 and the second retaining ring 33, and also facilitates the axial movement of the pull rod 31.

[0045] In other embodiments, the first retaining ring 32 may be clearance-fitted with the pull rod 31, and the second retaining ring 33 may be interference-fitted with the pull rod 31.

[0046] Furthermore, such as Figures 3 to 5 As shown, an anti-detachment component 36 is provided at the end of the pull rod 31 near the second retaining ring 33. The anti-detachment component 36 is located on the side of the second retaining ring 33 away from the first retaining ring 32, and the anti-detachment component 36 is detachably connected to the pull rod 31. The anti-detachment component 36 can prevent the second retaining ring 33 from falling off the pull rod 31. Making the anti-detachment component 36 detachably connected to the pull rod 31 facilitates assembly.

[0047] Optionally, the anti-loosening component 36 can be a nut or a pin.

[0048] Please refer to the following: Figure 4In this embodiment, the locking assembly 30 further includes a sleeve 37 fitted onto the surface of the pull rod 31. Two second connecting ears 21 are disposed outside the two first connecting ears 11, and the sleeve 37 is disposed between the two first connecting ears 11. In the locked state, both ends of the sleeve 37 abut against the two first connecting ears 11 respectively. In the unlocked state, the length of the sleeve 37 is less than the distance between the two first connecting ears 11. In the locked state, the two ends of the sleeve 37 abut against the two first connecting ears 11, which can prevent the first connecting ears 11 and the second connecting ears 21 from being excessively deformed due to pressure, so that the first connecting ears 11 and the second connecting ears 21 can return to their original state after unlocking.

[0049] In other embodiments, the two second connecting ears 21 may be disposed inside the two first connecting ears 11, in which case the sleeve 37 is disposed between the two second connecting ears 21. In other embodiments, the two first connecting ears 11 and the two second connecting ears 21 may be disposed alternately, in which case the sleeve 37 is disposed between the first connecting ears 11 and the second connecting ears 21 near the inner side.

[0050] like Figure 6 As shown, preferably, the end of the pressing member 35 near the first retaining ring 32 is an outwardly protruding arc surface. Setting the contact surface between the pressing member 35 and the first retaining ring 32 as an outwardly protruding arc surface can reduce the friction between the pressing member 35 and the first retaining ring 32 during relative movement, making it easier for the handle 34 to drive the pressing member 35 to rotate.

[0051] Please see Figure 4 and Figure 9 In one embodiment, the first connecting ear 11 may also have an arc-shaped groove 12 for sliding the pull rod 31. By providing the arc-shaped groove 12, the backrest mounting seat 20 can not only rotate around the pull rod 31 to adjust the relative angle between the backrest mounting seat 20 and the seat mounting seat 10, but also slide along the arc-shaped groove 12 with the pull rod 31 to adjust the relative angle, thus allowing the backrest angle adjustment to have a larger range.

[0052] Correspondingly, to facilitate backrest reset, the backrest angle adjustment mechanism 100 of this application also includes a reset assembly 40. The reset assembly 40 includes a reset shaft 41 and a connecting rod 42. The reset shaft 41 is rotatably connected to the seat plate mounting base 10. One end of the connecting rod 42 is connected to the pull rod 31, and the other end is connected to the reset shaft 41. The reset shaft 41 is connected to a reset element (not shown in the figure). When the pressing member 35 separates from the first retaining ring 32, the reset element pushes the reset shaft 41 to reset, thereby driving the pull rod 31 and the backrest mounting base 20 to slide and reset along the arc groove 12 via the connecting rod 42.

[0053] Preferably, the reset element is a torsion spring or a compression spring. Using a torsion spring or compression spring to drive the reset has a simple structure and helps to reduce costs.

[0054] To ensure that the rotation of the reset shaft 41 can drive the pull rod 31 to reset within the arc groove 12, the reset shaft 41 and the connecting rod 42 are either in a limiting fit or an interference fit, meaning that the connecting rod 42 rotates with the reset shaft 41.

[0055] like Figure 8 As shown, preferably, there are several connecting rods 42, and each connecting rod 42 is spaced apart along the axial direction of the tie rod 31. Setting the connecting rods 42 as multiple thin parts can ensure the overall strength of the connecting rods 42, while avoiding the problem that the thickness of a single connecting rod 42 is too large and will affect the extrusion deformation of the first connecting lug 11 and the second connecting lug 21.

[0056] During adjustment, the handle 34 is turned to separate the pressing member 35 from the first retaining ring 32. Then, the relative positions of the backrest mounting base 20 and the seat mounting base 10 are adjusted to the required positions. After the backrest is adjusted, the handle 34 is turned to make the pressing member 35 abut against the first retaining ring 32, which drives the pull rod 31 and the second retaining ring 33 to move toward the first retaining ring 32, thereby making the first connecting ear 11 and the second connecting ear 21 fit tightly together. The friction between the first connecting ear 11 and the second connecting ear 21 is used to keep the relative angle between the backrest mounting base 20 and the seat mounting base 10 locked.

[0057] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backrest angle adjustment mechanism comprising a seat pan mount (10) and a backrest mount (20) hingedly connected to one another, characterised in that: The seat mounting base (10) is provided with two oppositely arranged first connecting ears (11), and the backrest mounting base (20) is provided with two oppositely arranged second connecting ears (21), with each first connecting ear (11) and each second connecting ear (21) corresponding to a clearance fit; It also includes a locking assembly (30) located at the hinge of the seat mounting base (10) and the backrest mounting base (20). The locking assembly (30) includes a pull rod (31), a first retaining ring (32), a second retaining ring (33), and a handle (34). The pull rod (31) has two first connecting ears (11) and two second connecting ears (21) passing through it, and both ends of the pull rod (31) have protruding first connecting ears (11) and second connecting ears (21). The first retaining ring (32) and the second retaining ring (23) are connected by a locking mechanism (34). The rings (33) are respectively set at both ends of the pull rod (31). The handle (34) is set at one end of the pull rod (31) near the first retaining ring (32). The handle (34) is fixedly connected to the pressing member (35). The pressing member (35) is hinged to the pull rod (31). The handle drives the pressing member (35) to rotate, so that the pressing member (35) and the first retaining ring (32) switch between contact and separation, thereby controlling the locking and unlocking of the relative angle between the seat plate mounting base (10) and the backrest mounting base (20).

2. The backrest angle adjustment mechanism according to claim 1, characterized in that, The pull rod (31) is provided with a limiting post (311), and the pressing member (35) is provided with a limiting groove (351) corresponding to the limiting post (311), and the limiting groove (351) is arc-shaped.

3. The backrest angle adjustment mechanism according to claim 1, characterized in that, The first retaining ring (32) and the second retaining ring (33) are clearance-fitted with the pull rod (31).

4. The backrest angle adjustment mechanism according to claim 1, characterized in that, An anti-detachment component (36) is provided at one end of the pull rod (31) near the second retaining ring (33). The anti-detachment component (36) is located on the side of the second retaining ring (33) away from the first retaining ring (32). The anti-detachment component (36) is detachably connected to the pull rod (31).

5. The backrest angle adjustment mechanism according to claim 1, characterized in that, The locking assembly (30) further includes a sleeve (37) fitted onto the surface of the pull rod (31). Two second connecting ears (21) are disposed on the outside of two first connecting ears (11). The sleeve (37) is disposed between the two first connecting ears (11). In the locked state, the two ends of the sleeve (37) abut against the two first connecting ears (11) respectively. In the unlocked state, the length of the sleeve (37) is less than the distance between the two first connecting ears (11).

6. The backrest angle adjustment mechanism according to claim 1, characterized in that, The end of the pressing member (35) near the first retaining ring (32) is an outwardly protruding arc surface.

7. The backrest angle adjustment mechanism according to claim 1, characterized in that, An arc-shaped groove (12) is provided on the first connecting ear (11) for sliding of the pull rod (31).

8. The backrest angle adjustment mechanism according to claim 7, characterized in that, It also includes a reset assembly (40), which includes a reset shaft (41) and a connecting rod (42). The reset shaft (41) is rotatably connected to the base plate mounting seat (10). One end of the connecting rod (42) is connected to the pull rod (31), and the other end is connected to the reset shaft (41). The reset shaft (41) is connected to a reset component.

9. The backrest angle adjustment mechanism according to claim 8, characterized in that, The reset element is a torsion spring or a compression spring.

10. The backrest angle adjustment mechanism according to claim 8, characterized in that, The number of connecting rods (42) is several, and each connecting rod (42) is spaced apart along the axial direction of the tie rod (31).

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