Chair and backrest reclining mechanism therefor

Abstract

The utility model discloses a chair and backrest leaning adjustment mechanism, include: backrest, chair seat, two handrails, fixed mounting is in the left and right sides of chair seat, and handrail includes shell and the slider and gas spring of installation in the shell, and gas spring is connected with slider and can drive slider moves back and forth, and the lateral wall of shell is equipped with the press piece for triggering gas spring, the rear end of shell is hinged with backrest, and the rear end of slider is movably connected with backrest. In the scheme, when needing to adjust backrest, user only needs to press press piece to unlock gas spring, then leans back on backrest, and backrest drives slider to move back, and the rotation of backrest lower end relative to handrail occurs, thereby the depth and the angle of inclination of backrest are adjusted simultaneously, and press piece is released to backrest and can be stopped in any position, and after unlocking gas spring by pressing press piece, backrest is not leaned, and gas spring resets to drive backrest to move forward and reset, and the adjustment mode is simple and reliable.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a chair and its backrest tilt adjustment mechanism. Background Technology

[0002] In daily life, both adults and children spend long periods of time sitting to work, study, or perform various duties. Because many users sit for extended periods, it's crucial to adjust the chair's recline angle appropriately for each user to provide greater comfort, and it's also important to prevent users from sitting in the same position for extended periods. Current technology typically involves a tray under the seat, with the backrest fixed to the tray. Adjusting the tray allows for backrest recline adjustment. However, this backrest recline adjustment mechanism is located under the seat, making it inconvenient for users to access and adjust while seated, requiring repeated adjustments to the seat depth and wasting considerable time. Patent application CN110522222A discloses a chair back adjustable armrest structure, which is adjusted by a connecting frame and a connecting armrest. The connecting teeth and moving groove in the connecting armrest allow the chair back to be adjusted to tilt angle and recline. However, when adjusting the chair back, the armrest needs to be moved up or down as a whole, and the user's arm also needs to move with the armrest. Moreover, after the chair back is adjusted, the user needs to press the armrest down to make the connecting teeth and moving groove engage. During engagement, there is a tendency for back-and-forth slippage and jerking, resulting in a poor user experience. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a chair and its backrest tilt adjustment mechanism. After pressing the button on the armrest, the user can adjust the backrest by leaning back. The operation is simple and the user experience is good.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A backrest tilt adjustment mechanism, comprising:

[0006] Backrest;

[0007] Seat;

[0008] Two armrests are fixedly installed on the left and right sides of the seat. The armrests include a housing and a slider and a gas spring installed inside the housing. The gas spring is connected to the slider and can drive the slider to move back and forth. The side wall of the housing is provided with a button for triggering the gas spring.

[0009] The rear end of the outer shell is hinged to the backrest, and the rear end of the slider is movably connected to the backrest.

[0010] Preferably, the inner wall of the outer casing is provided with a limiting hole, and the connecting part between the rear end of the slider and the backrest is limited in the limiting hole and can move back and forth along the limiting hole; the hinge point between the slider and the backrest is located above the connection point between the outer casing and the backrest.

[0011] Preferably, a third through hole is provided on the left or right side wall of the housing, and the button is installed at the third through hole; the button is connected to the gas spring through a reset transmission device, and the external force acting on the button is transmitted to the gas spring through the reset transmission device to lock or unlock the gas spring.

[0012] Preferably, the piston rod on the gas spring is connected to a connecting seat at the end away from the cylinder. The connecting seat is connected to the first slider. The connecting seat is provided with a swing block groove. A swing block is hinged in the swing block groove. When the swing block swings to contact the piston rod, it can unlock the gas spring.

[0013] Preferably, the reset transmission device includes a transmission line, a rotating block and a rotating seat. The rotating seat is installed at the third through hole. The rotating block is hinged to the rotating seat. The transmission line connects the rotating block and the swing block. The pressing piece passes through the third through hole and the rotating seat and is connected to the rotating block. The external force acting on the pressing piece is transmitted to the swing block through the rotating block and the transmission line, thereby driving the swing block to swing.

[0014] Preferably, an elastic element for resetting the press is provided between the press and the rotating seat.

[0015] Preferably, an elastic element for resetting the rotating block is provided between the rotating seat and the rotating block, and / or an elastic element for resetting the swing block is provided between the swing block and the connecting seat.

[0016] A chair, including a backrest tilt adjustment mechanism as described above.

[0017] This utility model, by adopting the above technical solution, has the following beneficial effects:

[0018] In this invention, armrests are fixedly installed on the left and right sides of the chair seat. The outer shell of the armrest is hinged to the backrest, and the slider connected to the backrest is movably disposed inside the outer shell. By controlling the gas spring inside the armrest to lock or unlock, the position of the slider relative to the outer shell is locked or unlocked. When the backrest needs to be adjusted, the user only needs to press the button to unlock the gas spring, and then lean back against the backrest. The backrest drives the slider to move backward, and the lower end of the backrest rotates relative to the armrest, thereby simultaneously adjusting the depth and tilt angle of the backrest. Releasing the button will stop the backrest in any position. After pressing the button to unlock the gas spring, without leaning against the backrest, the gas spring resets, thereby driving the backrest to move forward to reset. The adjustment method is simple and reliable, and the travel of the gas spring is the adjustment travel of the backrest when the backrest is stopped in any position. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a structural diagram of the handrail;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure after removing the cover plate;

[0023] Figure 4 for Figure 3 A structural diagram showing the structure after removing the mounting plate;

[0024] Figure 5 This is a structural schematic diagram of the slider, button, gas spring, and reset transmission device;

[0025] Figure 6 This is a schematic diagram of the backrest structure;

[0026] Figure 7 An exploded view of the backrest;

[0027] Figure 8 A schematic diagram of the structure after the headrest is installed on the backrest.

[0028] Figure label:

[0029] 1. Backrest; 11. Back frame; 111. Limiting shaft; 12. Connecting piece; 13. Limiting groove; 131. Gear notch; 14. Lumbar support; 141. Protrusion; 15. Stop;

[0030] 3. Handrail; 31. Outer shell; 313. Limiting hole; 314. First through hole; 315. Mounting plate; 32. Slider; 321. Oval hole; 331. Cylinder; 332. Piston rod; 333. Swing block; 334. Transmission line; 335. Rotating block; 336. Rotating seat; 337. Connecting seat; 34. Button; 35. Cover plate;

[0031] 4. Headrest; 41. Support component. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] For clarity, in this invention, the side where the user sits is considered the front, and the opposite side is considered the back; the side closer to the center of the chair is considered the inside, and the opposite side is considered the outside.

[0038] like Figures 1 to 8As shown, this utility model discloses a backrest tilt adjustment mechanism, including: a backrest 1; a seat (not shown); two armrests 3, which are fixedly installed on the left and right sides of the seat. Each armrest 3 includes a housing 31 and a slider 32 and a gas spring installed inside the housing 31. The gas spring is connected to the slider 32 and can drive the slider 32 to move back and forth. A button 34 for triggering the gas spring is provided on the side wall of the housing 31. The rear end of the housing 31 is hinged to the backrest 1, and the rear end of the slider 32 is movably connected to the backrest 1.

[0039] In this invention, armrests 3 are fixedly installed on the left and right sides of the chair seat. The outer shell 31 of the armrests 3 is hinged to the backrest 1. The slider 32 connected to the backrest 1 is movably disposed inside the outer shell 31. The position of the slider 32 relative to the outer shell 31 is locked or unlocked by controlling the gas spring inside the armrest 3 through the button 34. When it is necessary to adjust the backrest 1, the user only needs to press the button to unlock the gas spring, and then lean back against the backrest 1. The backrest 1 drives the slider 32 to move backward, and the lower end of the backrest 1 rotates relative to the armrest 3, thereby simultaneously adjusting the depth and tilt angle of the backrest 1. Releasing the button 34 can stop the backrest 1 in any position. After pressing the button 34 to unlock the gas spring, without leaning against the backrest 1, the gas spring resets, thereby driving the backrest 1 to move forward and reset. Releasing the button 34 can stop the backrest 1 in any position. The adjustment method of the backrest is simple and reliable.

[0040] like Figure 1 and Figure 2 As shown, in this design, the hinge point between the slider 32 and the backrest 1 is located above the connection point between the outer casing 31 and the backrest 1. Figure 2 As shown, a limiting hole 313 is provided on the inner wall of the outer shell 31. The connecting part between the rear end of the slider 32 and the backrest 1 is limited and disposed within the limiting hole 313 and can move back and forth along the limiting hole 313. In this utility model, limiting shafts 111 protrude from both sides of the backrest 1. The two limiting shafts 111 extend into the limiting hole 313 and can move back and forth along the limiting hole 313. The rear end of the slider 32 has a longitudinally arranged oblong hole 321. The two limiting shafts 111 of the backrest 1 are limited and installed in the oblong hole 321 by limiting rods. In this way, when the backrest 1 drives the slider 32 to move back and forth, the limiting shafts 111 can move back and forth along the limiting hole 313. The lower end of the backrest 1 rotates relative to the armrest 3. The backrest 1 can make appropriate displacement relative to the slider 32 through the limiting rods disposed in the oblong hole 321, thereby preventing the backrest 1 from jamming. To facilitate the installation of the limiting rod, in this design, the outer wall of the outer shell 31 is provided with a first through hole 314, which can expose the connection between the rear end of the slider 32 and the backrest 1. The outer shell 31 is provided with a mounting plate 315 for covering the first through hole 314.

[0041] In this design, the structure of the handrail 3 is as follows: Figures 2 to 5As shown. A third through hole is provided on the left or right side wall of the outer casing 31, and the button 34 is installed in the third through hole; the button 34 is installed in the third through hole; the button 34 is connected to the gas spring through a reset transmission device, and the external force acting on the button 34 is transmitted to the gas spring through the reset transmission device to lock or unlock the gas spring.

[0042] In this utility model, the piston rod 332 on the gas spring is connected to a connecting seat 337 at the end away from the cylinder 331. The unlocking block for locking or unlocking the gas spring is movably disposed inside the piston rod 332 and extends out from the end of the piston rod 332 away from the piston. The connecting seat 337 is connected to the first slider 32. The connecting seat 337 is provided with a swing block groove. A swing block 333 is hinged in the swing block groove. When the swing block 333 swings to contact the unlocking block on the piston rod 332, it can unlock the gas spring. When the swing block 333 swings to contact the unlocking block away from the piston rod 332, it can lock the gas spring.

[0043] The reset transmission device includes a transmission line 334, a rotating block 335, and a rotating seat 336. The rotating seat 336 is installed at the third through hole. The rotating block 335 is hinged to the rotating seat 336. The transmission line 334 connects the rotating block 335 and the swing block 333. The pressing piece 34 passes through the third through hole and the rotating seat 336 and is connected to the rotating block 335. The external force acting on the pressing piece 34 is transmitted to the swing block 333 through the rotating block 335 and the transmission line 334. When the swing block 333 swings to contact the unlocking block on the piston rod 332, the gas spring is unlocked.

[0044] The transmission line 334 includes a sleeve and a core wire passing through the sleeve. The sleeve is a flexible but non-stretchable spiral metal tube, and the core wire is a non-stretchable steel wire rope. The two ends of the steel wire rope are connected to the rotating block 335 and the swing block 333 respectively through ball heads. In this way, displacement at one end of the steel wire rope will inevitably cause displacement at the other end of the steel wire rope.

[0045] An elastic element, such as a spring, is provided between the push button 34 and the rotating seat 336 to reset the push button 34. Thus, after the push button 34 is released, it automatically resets. In one embodiment, an elastic element, such as a torsion spring, is provided between the rotating seat 336 and the rotating block 335 to reset the rotating block 335. After the push button 34 resets, it no longer applies pressure to the rotating block 335. The rotating block 335 resets under the action of the elastic element, thereby pulling the transmission line 334 to reset, which in turn drives the swing block 333 to reset. This prevents the unlocking block from being compressed, locks the gas spring, and stops the piston rod 332 in its current position. The backrest 1 remains in this position. In another embodiment, a resetting elastic element, which is a torsion spring, is provided between the swing block 333 and the connecting seat 337. Thus, after the button 34 resets, the button 34 no longer applies pressure to the rotating block 335, and the rotating block 335 cannot apply tension to the swing block 333 via the transmission line 334. The swing block 333 resets under the action of the elastic element, thereby driving the rotating block 335 to reset as well. The unlocking block is no longer compressed, the gas spring locks, the length of the piston rod 332 no longer changes, and the backrest 1 stops at this position. Alternatively, in another embodiment, a resetting elastic element can be provided between the rotating seat 336 and the rotating block 335, and a resetting elastic element can also be provided between the swing block 333 and the connecting seat 337.

[0046] like Figure 6 and Figure 7 As shown, the backrest 1 includes a back frame 11 and a connector 12. The connector 12 is shaped like a "human," with its upper end connected to the upper connecting edge of the back frame 11 and its lower end connected to the left and right connecting edges of the back frame 11. The back frame 11 and the connector 12 are integrally formed. To support the user's lower back, the backrest 1 also includes a lumbar support 14. A limiting groove 13 is provided on the lower part of the left and right connecting edges of the back frame 11, and multiple vertically arranged stop recesses 131 are provided on the inner wall of the limiting groove 13. The left and right ends of the lumbar support 14 are respectively positioned within the limiting groove 13 in a way that allows it to move up and down. The lumbar support 14 has protrusions 141 that can fit into the stop recesses 131. This allows the user to move the lumbar support 14 up and down according to their needs. A stop 15 is installed at the limiting groove 13 to prevent the lumbar support 14 from slipping out of the limiting groove 13. The side wall where the gear position notch 131 is located is thin-walled, which can further increase the elasticity of the side wall where the gear position notch 131 is located, making it easier for the lumbar support 14 to adjust the gear position up and down within the limiting groove 13.

[0047] Of course, such as Figure 8As shown, a headrest 4 can also be provided on the backrest 1. The headrest 4 is installed on the backrest 1 via a support member 41. The headrest 4 can be fixed to the upper end of the support member 41, or it can be rotatably installed on the support member 41, or it can be installed on the support member 41 in a way that allows it to move up and down.

[0048] This utility model also discloses a chair, including a backrest tilt adjustment mechanism as described above.

[0049] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0050] The technical solutions described in this utility model also include any one or more specific features, structures, materials or characteristics described above, formed individually or in combination.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A backrest tilt adjustment mechanism, characterized in that, include: Backrest (1); Seat; Two armrests (3) are fixedly installed on the left and right sides of the seat. The armrests (3) include a housing (31) and a slider (32) and a gas spring installed in the housing (31). The gas spring is connected to the slider (32) and can drive the slider (32) to move back and forth. The side wall of the housing (31) is provided with a button (34) for triggering the gas spring. The rear end of the outer shell (31) is hinged to the backrest (1), and the rear end of the slider (32) is movably connected to the backrest (1).

2. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The inner wall of the outer shell (31) is provided with a limiting hole (313). The connection between the rear end of the slider (32) and the backrest (1) is limited in the limiting hole (313) and can move back and forth along the limiting hole (313). The hinge point of the slider (32) and the backrest (1) is located above the connection position between the outer shell (31) and the backrest (1).

3. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The outer casing (31) has a third through hole on the left or right side wall, and the button (34) is installed at the third through hole; the button (34) is connected to the gas spring through a reset transmission device, and the external force acting on the button (34) is transmitted to the gas spring through the reset transmission device to lock or unlock the gas spring.

4. The backrest tilt adjustment mechanism according to claim 3, characterized in that, The piston rod (332) on the gas spring is connected to a connecting seat (337) at one end away from the cylinder (331). The connecting seat (337) is connected to the first slider (32). The connecting seat (337) is provided with a swing block groove. A swing block (333) is hinged in the swing block groove. When the swing block (333) swings to contact the piston rod (332), it can unlock the gas spring.

5. A backrest tilt adjustment mechanism according to claim 4, characterized in that, The reset transmission device includes a transmission line (334), a rotating block (335), and a rotating seat (336). The rotating seat (336) is installed at the third through hole. The rotating block (335) is hinged to the rotating seat (336). The transmission line (334) connects the rotating block (335) and the swing block (333). The pressing piece (34) passes through the third through hole and the rotating seat (336) and is connected to the rotating block (335). The external force acting on the pressing piece (34) is transmitted to the swing block (333) through the rotating block (335) and the transmission line (334), thereby driving the swing block (333) to swing.

6. A backrest tilt adjustment mechanism according to claim 5, characterized in that, An elastic element for resetting the press (34) is provided between the press (34) and the rotating seat (336).

7. A backrest tilt adjustment mechanism according to claim 5, characterized in that, An elastic element for resetting the rotating block (335) is provided between the rotating seat (336) and the rotating block (335), and / or, an elastic element for resetting the swing block (333) is provided between the swing block (333) and the connecting seat (337).

8. A chair, characterized in that, Includes a backrest tilt adjustment mechanism as described in any one of claims 1-7.

Images