Seat back recliner mechanism and seat

Abstract

The utility model relates to a back part forward leaning reset mechanism and seat of seat, the back part forward leaning reset mechanism of seat, including the support arm of seat back, still include base, base is equipped with adjusting groove and located adjusting groove both sides's base axle hole, at least one side base axle hole is provided with gear piece, cam rotating subassembly, including rotating piece, rotating cam and cam connecting rod, rotating piece is fixed in the end of support arm, rotating piece is opposite with base and is adapted to set up and can rotate to front end, rotating cam includes cam seat and cam body, sets up in adjusting groove, cam seat is equipped with the through cam axle hole, and rotating connection between cam seat and gear piece, and cam axle hole and base axle hole axial opposite, rotating piece is equipped with the through rotating piece axle hole, and cam connecting rod passes rotating piece axle hole, cam axle hole and is opposite with rotating cam and fixes gradually. Through change seat back's adjusting structure and assembly connection, realize forward leaning reset self -adaptation adjustment, improve convenience and comfort.

Description

Technical Field

[0001] This utility model relates to a backrest tilt-back reset mechanism for a seat and the seat itself, belonging to the field of seat components and seat technology. Background Technology

[0002] As a piece of furniture closely related to human life, chairs bring convenience to people's work and meet the needs of daily desk work. When working, the body usually needs to lean forward to maintain a reasonable sitting posture. At this time, the back of the chair needs to be able to lean forward adaptively to support the back and improve the comfort and stability of the sitting posture. When resting, the body usually needs to lean back to maintain a relaxed state. At this time, the back of the chair needs to be able to lean back adaptively to support the leaning back and improve the comfort of the resting state. However, the back of existing chairs is either fixed and not adjustable, or requires manual adjustment of the height to achieve a suitable back posture. How to achieve the forward tilt and return adjustment of the chair back to meet the needs of different sitting postures is the technical problem that this utility model aims to solve.

[0003] Chinese utility model patent CN216932462U, published on July 12, 2022, discloses a self-adhesive backrest, including a support frame, a lumbar support plate, and support rods. The upper end of the support rods is hinged to an upper hinge fitting, one end of which is fixed to the middle of the support frame. The lower end of the support rods is hinged to a lower hinge fitting, and the lumbar support plate is bolted to the lower hinge fitting. A drive assembly is hinged to the support frame, one end of which is hinged to the support rods via a hinge pin. This utility model uses a switch to drive a pneumatic support rod (or a hydraulic telescopic rod or an electric telescopic rod) to rotate the support rods around their upper hinge point. Because the two support rods move forward with the lumbar support plate under opposite torsional action, ensuring the lumbar support plate remains in close contact with the user's back, providing stable support and helping to maintain good posture. This utility model still has the following shortcomings: it can only maintain the forward tilt angle of the lumbar support by having two support rods that move forward under the action of reverse torsion, so that the lumbar support can always be close to the user's back, providing stable support and helping to maintain a good sitting posture. However, it has a high manufacturing cost, large size, and relatively complex structure. This utility model aims to solve this technical problem by changing the adjustment structure of the seat back and altering the assembly connection method to achieve adaptive adjustment of the seat back's forward tilt return. Utility Model Content

[0004] One of the purposes of this invention is to address the shortcomings of existing technologies in adjusting the forward tilt reset of seat backs to meet the needs of different sitting postures, and to provide a seat back tilt reset mechanism.

[0005] The second objective of this invention is to provide a seat equipped with a backrest tilt-reset mechanism of this invention. By changing the adjustment structure of the seat back and the assembly connection method, the backrest tilt-reset adaptive adjustment of the seat can be achieved, greatly improving the convenience and comfort of using the seat.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] The seat back tilt-back reset mechanism includes the seat back support arms.

[0008] It also includes a base, which is provided with an adjustment groove and base shaft holes located on both sides of the adjustment groove, and a stop component is provided in at least one base shaft hole;

[0009] A cam rotation assembly includes a rotating component, a rotating cam, and a cam connecting rod. The rotating component is fixed to the end of the support arm and is adapted to the base, with its front end capable of relative rotation.

[0010] The rotary cam includes a cam seat and a cam body, which are disposed in the adjustment groove. The cam seat has a through cam shaft hole. The cam seat is rotatably connected to the stop component, and the cam shaft hole is axially opposite to the base shaft hole.

[0011] The rotating component has a through rotating component shaft hole, and the cam connecting rod passes through the rotating component shaft hole and the cam shaft hole in sequence and is fixed relative to the rotating cam.

[0012] The rotation of the rotating cam connecting rod drives the cam body to rotate, which in turn drives the rotating component to rotate relative to the base, thereby achieving the adjustment of the back tilt reset.

[0013] A limiting component is also provided between the rotating component and the rotating cam. This limiting component restricts the rotating component from rotating relative to the base without being driven by the rotation of the cam body. The limiting component prevents the rotating component from not forming a linkage with the cam body, thus preventing the rotating component from detaching from the rotating cam and tilting forward under external force on the support arm. The limiting component indirectly locks the rotating component through the rotating cam, ensuring that the rotating component is only driven and tilts forward when the rotating cam rotates, thereby improving the reliability of the tilting reset mechanism.

[0014] Preferably, the rotating component is provided with a drive side plate, which can abut against the cam body. When the cam body rotates to the abutment state, the drive side plate drives the rotating component to rotate relative to the base, thereby adjusting the forward tilt. When the cam body rotates to the non-abutment state, the drive side plate drives the rotating component to rotate relative to the base and reset. The limiting component is located at the end of the drive side plate, with an arc-shaped longitudinal section extending below the rotating cam. At least part of the inner wall of the limiting component is in contact with the outer wall of the rotating cam to form a limiting structure. The limiting component of this invention has an arc-shaped longitudinal section extending below the rotating cam (approximately a hook-shaped limiting component, or a limiting hook, which hooks the rotating cam to achieve limiting), indirectly locking the rotating component through the rotating cam. Only when the rotating cam rotates will the rotating component be driven, thereby tilting forward, improving the reliability of the forward tilt reset mechanism.

[0015] Preferably, the gear shifter has at least two positions: a forward tilt position and a reset position. The rotary cam is provided with a forward tilt limit part and a reset limit part. The forward tilt adjustment is achieved by the cooperation of the forward tilt limit part and the forward tilt position, and the reset adjustment is achieved by the cooperation of the reset limit part and the reset position.

[0016] Preferably, the tilting position is located at the position where the rotary cam rotates clockwise by α°; the reset position is located at the position where the rotary cam rotates counterclockwise by α°; α is 60-120°.

[0017] Preferably, α is 120°. When the rotating cam rotates 120° clockwise, the rotating component rotates relative to the base, achieving a 6° forward tilt of the back. When the rotating cam rotates 120° counterclockwise, the rotating component rotates relative to the base, achieving a return of the back to its initial state.

[0018] Preferably, the rotating component is provided with a groove that allows the rotating cam to rotate and an anti-rotation part that restricts the rotation of the rotating cam. When the rotating cam rotates to the point where the cam body abuts against the anti-rotation part, it drives the rotating component to rotate relative to the base, thereby achieving the adjustment of the back tilt.

[0019] Preferably, it also includes a first soundproof sleeve and a second soundproof sleeve, which are respectively disposed in the shaft holes of the rotating parts on both sides.

[0020] Preferably, the rotating component is rotatably connected to the base through the engagement of a rotating shaft and a rotating shaft hole.

[0021] Preferably, the cam connecting rod passes through the rotating component, the second sound insulation sleeve, and the rotating cam in sequence. The cam connecting rod has a positioning hole on its side. When the positioning hole is aligned with the corresponding positioning hole on the side of the cam base, it is fixed by a positioning pin.

[0022] Preferably, the positioning pin is an open cylindrical pin, and a handle is also fixedly provided on the outside of the cam connecting rod.

[0023] A seat includes a seat back, an armrest structure, and a seat base, wherein the seat back tilt-back reset mechanism is fixed to the seat base via the seat base.

[0024] The beneficial effects of this utility model are:

[0025] When the user is working, the cam can be manually rotated to adjust the backrest angle, allowing it to fully conform to the body. When the user is resting, the cam can be manually rotated to return the backrest to its initial angle, providing a comfortable position. It has low manufacturing cost, a compact and relatively simple structure, and is easy to industrialize. In short, by changing the adjustment structure of the seat back and altering the assembly connection method, the seat's backrest tilt-reset adaptive adjustment can be achieved. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 yes Figure 1 A partial schematic diagram;

[0029] Figure 3 yes Figure 1 A cross-sectional view (reset state);

[0030] Figure 4 yes Figure 1 A sectional view (in a forward-leaning position);

[0031] Figure 5 yes Figure 1 A partial schematic diagram;

[0032] Figure 6 yes Figure 1 A partial schematic diagram;

[0033] Figure 7 This is a partial sectional view (in the reset state);

[0034] Figure 8 It is a partial sectional view (tilted forward).

[0035] The markings in the attached diagram are as follows: 1 Support arm; 2 Rotating component; 3 Base; 4 Rotating cam; 5 Cam connecting rod; 6 Handle; 7 Gear; 8 First sound insulation sleeve; 9 Second sound insulation sleeve; 10 Open cylindrical pin; 115 / 16 screw; 12 Threaded screw; 13 M6 screw. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0037] Example: Figure 1-8 As shown, the seat back tilt-back reset mechanism includes a support arm 1 for the seat back.

[0038] It also includes a base 3, which is provided with an adjustment groove and base shaft holes located on both sides of the adjustment groove, and a stop piece 7 is provided in at least one base shaft hole;

[0039] The cam rotation assembly includes a rotating component 2, a rotating cam 4, and a cam connecting rod 5. The rotating component 2 is fixed to the end of the support arm 1. The rotating component 2 is adapted to the base 3 and its front end can rotate relative to it.

[0040] The rotary cam 4 includes a cam seat and a cam body, which are disposed in the adjustment groove. The cam seat has a through cam shaft hole. The cam seat is rotatably connected to the stop component 7, and the cam shaft hole is axially opposite to the base shaft hole.

[0041] The rotating component 2 is provided with a through rotating component shaft hole, and the cam connecting rod 5 passes through the rotating component shaft hole and the cam shaft hole in sequence and is fixed relative to the rotating cam 4.

[0042] The rotation of the rotating cam connecting rod 5 drives the cam body to rotate, which in turn drives the rotating part 2 to rotate relative to the base 3, thereby achieving the adjustment of the back tilting back.

[0043] A limiting member 21 is also provided between the rotating component 2 and the rotating cam 4. The limiting member 21 restricts the rotating component 2 from rotating relative to the base 3 without being driven by the rotation of the cam body. The limiting member prevents the rotating component from not forming a linkage structure with the cam body, that is, the rotating component from tilting forward after being disengaged from the rotating cam under the action of external force on the support arm. The limiting member indirectly locks the rotating component through the rotating cam. The rotating component will only be driven and tilted forward when the rotating cam rotates, thereby improving the reliability of the tilting and reset mechanism.

[0044] Specifically, the rotating component 2 is provided with a drive side plate, which can abut against the cam body. When the cam body rotates to the abutment state, the rotating component 2 is driven to rotate relative to the base 3 through the drive side plate, thereby achieving the adjustment of the back tilt. When the cam body rotates to the non-abutment state, the rotating component 2 is driven to rotate relative to the base 3 to reset. The limiting component 21 is provided at the end of the drive side plate, with an arc-shaped longitudinal section, extending to the bottom of the rotating cam 4, and the inner wall of the limiting component 21 is at least partially attached to the outer wall of the rotating cam 4 to form a limiting structure. The limiting component of this utility model has an arc-shaped longitudinal section, extending to the bottom of the rotating cam (approximately a hook-shaped limiting component, or a limiting hook, which hooks the rotating cam to achieve limiting), indirectly locking the rotating component through the rotating cam. Only when the rotating cam rotates will the rotating component be driven, thereby tilting forward, improving the reliability of the tilt reset mechanism.

[0045] In this embodiment, the gear shifter 7 has at least two gears, namely a forward tilt gear and a reset gear. The rotary cam 4 is provided with a forward tilt limit part and a reset limit part. The forward tilt adjustment is realized by the cooperation of the forward tilt limit part and the forward tilt gear, and the reset adjustment is realized by the cooperation of the reset limit part and the reset gear.

[0046] Specifically, the forward tilt position is located at the position where the rotary cam 4 rotates clockwise by α°; the reset position is located at the position where the rotary cam 4 rotates counterclockwise by α°; α is 60-120°.

[0047] More specifically, α is 120°. When the rotating cam 4 rotates 120° clockwise, the rotating component 2 rotates relative to the base 3, achieving a 6° forward tilt of the back. When the rotating cam 4 rotates 120° counterclockwise, the rotating component 2 rotates relative to the base 3, achieving a return of the back to its initial state.

[0048] In this embodiment, the rotating component 2 is provided with a groove that allows the rotating cam 4 to rotate and an anti-rotation part that restricts the rotation of the rotating cam 4. When the rotating cam 4 rotates to the point where the cam body abuts against the anti-rotation part, it drives the rotating component 2 to rotate relative to the base 3, thereby achieving the adjustment of the back tilt.

[0049] In this embodiment, a first soundproof sleeve 8 and a second soundproof sleeve 9 are also included, which are respectively disposed in the rotating shaft holes on both sides.

[0050] In this embodiment, the rotating component 2 and the base 3 are rotatably connected by the cooperation of the rotating shaft and the rotating shaft hole.

[0051] In this embodiment, the cam connecting rod 5 is sequentially inserted into the rotating part 2, the second sound insulation sleeve 9, and the rotating cam 4. The cam connecting rod 5 has a positioning hole on its side. When the positioning hole is aligned with the corresponding positioning hole on the side of the cam base, it is fixed by a positioning pin.

[0052] In this embodiment, the positioning pin is an open cylindrical pin 11, and a handle 6 is also fixedly provided on the outside of the cam connecting rod 5.

[0053] A seat includes a seat back, an armrest structure, and a seat base, wherein the seat back tilt-back reset mechanism is fixed to the seat base via the base 3.

[0054] Assembly Instructions for this Utility Model: Install the shifting parts 7 into the corresponding base shaft holes on the left and right sides of the base 3. Then, install the rotating cam 4 on the shifting parts 7, aligning the cam shaft hole with the base shaft hole. Install the first sound insulation sleeve 18 and the second sound insulation sleeve 9 into the corresponding rotating shaft holes on the left and right sides of the rotating parts 2. Align the front ends of the base 3 and the rotating parts 2 together, and tighten them using the male and female screws 12 and M6 screws 13 (replacing the rotating shaft core) through the rotating shaft core hole. Then, insert the cam connecting rod 5 from right to left through the rotating parts 2, the second sound insulation sleeve 9, and the rotating cam 4. When the side positioning hole of the cam connecting rod 5 aligns with the side positioning hole of the rotating cam, insert the open cylinder 10 into the hole. Finally, tap the handle 6 into one end of the cam connecting rod 5 to complete the installation. Install the backrest tilt reset mechanism onto the seat base, and tighten the base 3 with the corresponding 5 / 16 screws 11 to complete the installation. When the handle 6 drives the rotating cam 4 to rotate 120 degrees counterclockwise, the back tilts forward by 6 degrees. At this time, the forward tilting limit part on the rotating cam 4 springs into the forward tilting position groove of the gear piece 7, completing the forward tilting function locking action. When the handle 6 drives the rotating cam 4 to rotate 120 degrees clockwise, the back returns to the initial state. At this time, the reset limit part on the rotating cam 4 springs into the reset position groove of the gear piece 7, completing the initial state locking action.

[0055] The beneficial effects of this utility model are:

[0056] When the user is working, the cam can be manually rotated to adjust the backrest angle, allowing it to fully conform to the body. When the user is resting, the cam can be manually rotated to return the backrest to its initial angle, providing a comfortable position. It has low manufacturing cost, a compact and relatively simple structure, and is easy to industrialize. In short, by changing the adjustment structure of the seat back and altering the assembly connection method, the seat's backrest tilt-reset adaptive adjustment can be achieved.

[0057] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A seat back tilt-back reset mechanism, comprising a seat back support arm (1), characterized in that, It also includes a base (3), which is provided with an adjustment groove and base shaft holes located on both sides of the adjustment groove, and a stop piece (7) is provided in at least one base shaft hole; The cam rotation assembly includes a rotating component (2), a rotating cam (4), and a cam connecting rod (5). The rotating component (2) is fixed to the end of the support arm (1). The rotating component (2) is adapted to the base (3) and its front end can rotate relative to the base. The rotary cam (4) includes a cam seat and a cam body, which are disposed in the adjustment groove. The cam seat has a through cam shaft hole. The cam seat is rotatably connected to the stop piece (7), and the cam shaft hole is axially opposite to the base shaft hole. The rotating component (2) is provided with a through rotating component shaft hole, and the cam connecting rod (5) passes through the rotating component shaft hole and the cam shaft hole in sequence and is fixed relative to the rotating cam (4); By rotating the cam connecting rod (5), the cam body rotates, which in turn drives the rotating part (2) to rotate relative to the base (3), thereby achieving the adjustment of the back tilt reset. A limiting member (21) is also provided between the rotating member (2) and the rotating cam (4), and the limiting member (21) restricts the rotating member (2) from rotating relative to the base (3) without the cam body rotating.

2. A seat back recline mechanism according to claim 1, wherein, The rotating component (2) is provided with a drive side plate, which can abut against the cam body. When the cam body rotates to the abutment state, the rotating component (2) is driven to rotate relative to the base (3) through the drive side plate to achieve the adjustment of the back tilt. When the cam body rotates to the non-abutment state, the rotating component (2) is driven to rotate relative to the base (3) to reset. The limiting component (21) is provided at the end of the drive side plate, with an arc-shaped longitudinal section, extending to the bottom of the rotating cam (4), and the inner wall of the limiting component (21) is at least partially attached to the outer wall of the rotating cam (4) to form a limiting structure.

3. The seat back recline mechanism of claim 1 wherein, The gear position (7) has at least two positions, namely a forward tilt position and a reset position. The rotary cam (4) is provided with a forward tilt limit part and a reset limit part. The forward tilt adjustment is realized by the cooperation of the forward tilt limit part and the forward tilt position, and the reset adjustment is realized by the cooperation of the reset limit part and the reset position.

4. A seat back recline mechanism according to claim 3, wherein The forward tilt position is located at the position where the rotary cam (4) rotates clockwise by α°; the reset position is located at the position where the rotary cam (4) rotates counterclockwise by α°; α is 60-120.

5. A seat back recline mechanism according to claim 4, wherein, The α is 120°. The rotating cam (4) rotates 120° clockwise, and the rotating part (2) rotates relative to the base (3) to achieve a 6° forward tilt of the back. The rotating cam (4) rotates 120° counterclockwise, and the rotating part (2) rotates relative to the base (3) to achieve a return of the back to its initial state.

6. A seat back recline mechanism according to claim 1 or 2 or 3 or 4 or 5 wherein, The rotating component (2) is provided with a groove that allows the rotating cam (4) to rotate and an anti-rotation part that restricts the rotation of the rotating cam (4). When the rotating cam (4) rotates to the point where the cam body abuts against the anti-rotation part, the rotating component (2) is driven to rotate relative to the base (3) to achieve the adjustment of the back tilt.

7. The seat back recline mechanism according to claim 1 or 2 or 3 or 4 or 5 wherein, It also includes a first soundproof sleeve (8) and a second soundproof sleeve (9), which are respectively installed in the rotating shaft holes on both sides.

8. The seat back recline mechanism according to claim 1 or 2 or 3 or 4 or 5 wherein, The rotating component (2) and the base (3) are rotatably connected by the cooperation of the rotating shaft and the rotating shaft hole.

9. A seat back recline mechanism according to claim 8, characterised in that: The cam connecting rod (5) is inserted into the rotating part (2), the second sound insulation sleeve (9), and the rotating cam (4) in sequence. The cam connecting rod (5) has a positioning hole on its side. When the positioning hole is aligned with the corresponding positioning hole on the side of the cam base, it is fixed by a positioning pin. The positioning pin is an open cylindrical pin (10). A handle (6) is also fixed on the outside of the cam connecting rod (5).

10. A seat comprising a seat back, an armrest structure, and a seat base, characterized in that, The seat back tilt reset mechanism described in any one of claims 1-9 is used and is fixed to the seat base via the base (3).

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