Seat with adjustable backrest angle

Abstract

The utility model discloses a seat with an adjustable backrest angle, which comprises a seat body, a backrest and two locking pieces, the backrest is pivoted on the seat body, and a pivoting shaft is positioned between the upper end and the lower end of the backrest; the two locking pieces are respectively arranged on two opposite sides of the seat body; a clamping part is arranged at the lower end of the backrest, the clamping part is provided with at least two gears located at different angles, the seat body is provided with a locking position and an unlocking position, and the locking piece is movably arranged between the locking position and the unlocking position; a linkage mechanism is connected between the two locking pieces; when the locking piece is located at the unlocking position, the locking piece is separated from the clamping part, so that the backrest can rotate around the pivoting shaft to adjust the angle; and when the locking piece is positioned at the locking position, the locking piece is clamped at one gear of the clamping part, so that the backrest is locked at the angular position. The chair with the adjustable backrest angle has the advantages of simplicity in operation and convenience in use.

Description

Technical Field

[0001] The utility model relates to a means of transport, in particular to a seat with an adjustable backrest angle. Background Art

[0002] A mobility scooter or wheelchair is a means of transportation for people with limited mobility, and is mostly used by certain patients and the elderly. Due to the differences in the user groups, many parts of the mobility scooter are adjustable. For example, the backrest of the mobility scooter seat can be adjusted in angle. The backrest is locked or released through a locking mechanism, so that the backrest can be positioned at different angles to meet the angle requirements of different users. This locking mechanism generally uses a locking pin to hold the backrest. In order to achieve a force balance on the left and right sides of the backrest, the same locking pin is needed to lock both sides of the seat, and the locking pins on both sides are unlocked simultaneously when releasing the lock. This requires the user to operate with both hands at the same time, which is not convenient for people with limited mobility. Utility Model Content

[0003] The utility model aims to provide a chair with an adjustable backrest angle which is simple to operate and convenient to use.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a chair with adjustable backrest angle, comprising a seat body, a backrest and two locking members, wherein the backrest is pivotally connected to the seat body, and the pivot axis is located between the upper and lower ends of the backrest; the two locking members are respectively arranged on opposite sides of the seat body; a clamping part is provided at the lower end of the backrest, and the clamping part is provided with at least two gears located at different angles, and the seat body is provided with a locking position and a release position, and the locking member is movably arranged between the locking position and the release position; a linkage mechanism is connected between the two locking members to make the two locking members move synchronously; when the locking member is in the release position, the locking member disengages from the clamping part, so that the backrest can be rotated around the pivot axis to adjust the angle; when the locking member is in the locking position, the locking member is clamped in one of the gears of the clamping part to lock the backrest at this angular position.

[0005] Compared with the prior art, the utility model pivotally connects the backrest to the seat body so that the backrest can rotate relative to the seat body, and then sets locking pieces on both sides of the backrest, sets gears with different angles at the lower end of the backrest, and uses the locking pieces to lock at each gear, so that the backrest can be positioned at different angles, so that the backrest can achieve the purpose of adjusting the angle. In addition, a linkage mechanism is set between the two locking pieces, and the linkage mechanism is used to transfer the driving force received by the locking piece on one side to the locking piece on the other side, so that the locking pieces on both sides are simultaneously stressed and can move synchronously, so as to achieve the purpose of synchronously locking or releasing the backrest. Therefore, the user only needs to use one hand to drive the locking piece on one side to achieve the purpose of locking or releasing the two sides of the backrest, avoiding the need for the user to operate with both hands, and the operation is simpler and more convenient.

[0006] Preferably, the linkage mechanism includes a pair of first connecting rods, a pair of second connecting rods and a rotating shaft, one end of the first connecting rod is pivotally connected to the locking member located on the side, the other end of the first connecting rod is pivotally connected to one end of the second connecting rod located on the side, the other end of the second connecting rod located on the side is fixedly connected to the rotating shaft, and the rotating shaft is pivotally connected to the seat body. In this way, when the locking member moves, the first connecting rod drives the second connecting rod to swing, and the second connection drives the rotating shaft to rotate, so that the driving force can be converted into the torsion of the rotating shaft and transmitted to the first connecting rod and the second connecting rod on the other side, and then the first connecting rod on the other side swings to drive the locking member on the other side to move, so that the two locking members can achieve the purpose of synchronous movement. Therefore, it is only necessary to operate the locking member on one side of the backrest, which effectively improves the convenience of operation.

[0007] Preferably, a slide groove is provided on the seat body, an end of the slide groove close to the engaging portion is the locking position, and an end away from the engaging portion is the releasing position, and the locking member is an axle pin, and the axle pin is movably arranged in the slide groove.

[0008] Specifically, the seat body has a mounting seat; the backrest is pivotally connected to the mounting seat, and the slide slot is arranged on the mounting seat.

[0009] Preferably, the seat with adjustable backrest angle further comprises a first operating handle; the first operating handle is connected to the locking member to drive the locking member to move. By providing the first operating handle, the locking member can be driven to move more conveniently and labor-savingly, and the operation is more comfortable and convenient.

[0010] Specifically, the first operating handle is pivotally connected to the mounting seat of the seat body through a rotating shaft, and the first operating handle drives the locking member to move when rotating around the rotating shaft.

[0011] Specifically, the seat with adjustable backrest angle further includes a second operating handle; the second operating handle is coaxially pivoted to the mounting seat with the first operating handle, and the second operating handle is connected to the locking member to drive the locking member to move. By providing the second operating handle, the locking member can be operated in another direction, thereby further improving the convenience of operation.

[0012] Preferably, the mounting seat is provided with a limiter to limit the maximum angle of rotation of the backrest relative to the seat body. By providing the limiter, on the one hand, it can serve as a support to support a part of the backrest under force, and on the other hand, it can make the backrest more accurately positioned and more convenient to adjust during adjustment.

[0013] Preferably, the seat with adjustable backrest angle further comprises an elastic reset member, which is arranged between the locking member and the mounting seat of the seat body to provide elastic force to move the locking member to the locking position. In this way, the locking member can be automatically reset to the locking position, thereby automatically locking the backrest, avoiding accidental unlocking, and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front stereoscopic diagram of a seat with an adjustable backrest angle according to the utility model.

[0015] Figure 2 The utility model is a rear perspective view of a seat with an adjustable backrest angle.

[0016] Figure 3 The utility model is a side view of a seat with an adjustable backrest angle.

[0017] Figure 4 It is a side view of the cooperation between the locking piece and the slide groove of the seat with adjustable backrest angle of the utility model.

[0018] Figure 5 The utility model is an exploded view of a seat with an adjustable backrest angle.

[0019] Figure 6 The utility model is a state diagram of a seat with adjustable backrest angle when the backrest is unlocked.

[0020] Figure 7 This is a state diagram of the seat with adjustable backrest angle of the utility model after the backrest angle is adjusted. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0022] like Figures 1 to 5 As shown, the seat 100 with adjustable backrest 2 angle of the utility model comprises a seat body 1, a backrest 2 and two locking members 3, the backrest 2 is pivoted on the seat body 1, and the pivot axis 2a is located between the upper and lower ends of the backrest 2. The two locking members 3 are respectively arranged on opposite sides of the seat body 1; the lower end of the backrest 2 is provided with a clamping part 21, and the clamping part 21 is provided with at least two gear positions 211 located at different angles, and the embodiment has two gear positions. The seat body 1 is provided with a locking position 111 and a release position 112, and the locking member 3 is movably arranged between the locking position 111 and the release position 112. A linkage mechanism 4 is connected between the two locking members 3 so that the two locking members 3 move synchronously. The seat 100 with adjustable backrest 2 angle also includes an elastic reset member 5, which is a compression spring. The elastic reset member 5 is arranged between the locking member 3 and the seat body 1 so as to provide an elastic force to move the locking member 3 to the locking position 111. In this way, the locking member 3 can automatically return to the locking position 111, thereby automatically locking the backrest 2, avoiding accidental unlocking and improving the safety of use. When the locking member 3 is in the unlocking position 112, the locking member 3 is disengaged from the engaging portion 21, so that the backrest 2 can be rotated around the pivot axis 2a to adjust the angle. When the locking member 3 is in the locking position 111, the locking member 3 is engaged in one of the gear positions 211 of the engaging portion 21, so as to lock the backrest 2 at this angle position.

[0023] Please combine again Figure 3 and Figure 5 As shown, the linkage mechanism 4 includes a pair of first connecting rods 41, a pair of second connecting rods 42 and a rotating shaft 43, one end of the first connecting rod 41 is pivoted to the locking member 3 located on the side, the other end of the first connecting rod 41 is pivoted to one end of the second connecting rod 42 located on the side, the other end of the second connecting rod 42 located on the side is fixedly connected to the rotating shaft 43, the rotating shaft 43 is pivoted to the base body 1, and the rotating shaft 43 spans the left and right sides of the base body 1. In this way, when the locking member 3 moves, the first connecting rod 41 is driven to swing, and then the second connecting rod 42 is driven to swing through the first connecting rod 41, and then the rotating shaft 43 is driven to rotate by the second connection, so that the driving force can be converted into the torsion of the rotating shaft 43 and transmitted to the first connecting rod 41 and the second connecting rod 42 on the other side, so that the first connecting rod 41 on the other side swings to drive the locking member 3 on the other side to move, so that the two locking members 3 can achieve the purpose of synchronous movement. Therefore, it is only necessary to operate the locking member 3 on one side of the backrest 2, which effectively improves the convenience of operation.

[0024] Please combine again Figure 4 and Figure 5As shown, the seat body 1 is provided with a slide groove 11, and the seat body 1 has a mounting seat 12; the backrest 2 is pivotally connected to the mounting seat 12, and the slide groove 11 is arranged on the mounting seat 12. The end of the slide groove 11 close to the engaging portion 21 is the locking position 111, and the end away from the engaging portion 21 is the unlocking position 112, and the locking member 3 is a shaft pin, which is movably arranged on the slide groove 11.

[0025] Please see again Figures 1 to 3 The seat 100 with adjustable backrest 2 angle further includes a first operating handle 6; the first operating handle 6 is connected to the locking member 3 to drive the locking member 3 to move. Specifically, the first operating handle 6 is pivoted to the mounting seat 12 through a rotating shaft 61, and the first operating handle 6 drives the locking member 3 to move when rotating around the rotating shaft 61. The central axis of the rotating shaft 61 is parallel to the central axis of the locking member 3. The slide groove 11 is an arc groove, and the center of the arc is concentric with the rotating shaft 61. The first operating handle 6 is arranged on one of the outer sides of the backrest 2, so that the backrest 2 can be adjusted when the user sits on the seat. By setting the first operating handle 6, it is more convenient and labor-saving to drive the locking member 3 to move, and the operation is more comfortable and convenient. The seat 100 with adjustable backrest 2 angle further includes a second operating handle 7; the second operating handle 7 is coaxially pivoted to the mounting seat 12 with the first operating handle 6, and the second operating handle 7 is connected to the locking member 3 to drive the locking member 3 to move. The second operating handle 7 is located at the inner side of the backrest 2, and the two second operating handles 7 connected to the two locking members 3 are fixedly connected by a cross bar 71, and the cross bar 71 is located at the rear side of the backrest 2, so that the locking members 3 on both sides can be synchronously driven when the second operating handle 7 is operated. By providing the second operating handle 7, the locking members 3 can be operated at the rear side of the backrest 2, thereby further improving the convenience of operation.

[0026] For example Figure 7 As shown, the mounting seat 12 is provided with a limiting portion 121 to limit the maximum angle of rotation of the backrest 2 relative to the seat body 1. By providing the limiting portion 121, on the one hand, it can be used as a support to support a part of the backrest 2 under force, and on the other hand, the backrest 2 can be positioned more accurately and adjusted more conveniently during adjustment.

[0027] Combining the above and Figure 6 and Figure 7 The adjustment process of the backrest 2 adjustable seat of the utility model is described in detail below:

[0028] When the user sits on the seat and adjusts the angle of the backrest 2, he / she operates the first operating handle 6 with one hand, so that the first operating handle 6 rotates around the rotating shaft 61, thereby driving the locking member 3 to slide downward along the slide groove 11. At the same time, the locking member 3 drives the linkage mechanism 4 to move. Under the action of the linkage mechanism 4, the first connecting rod 41 and the second connecting rod 42 on this side swing and drive the rotating shaft 43 to rotate. The rotating shaft 43 drives the first connecting rod 41 and the second connecting rod 42 on the other side to swing, thereby pulling the locking member 3 on the other side to slide downward. At this time, the two locking members 3 simultaneously disengage from the gear position 211 of the engaging portion 21 on each side. The backrest 2 can be unlocked, and then after adjusting the angle of the backrest 2, the first operating handle 6 is released, so that the two locking members 3 slide upward under the elastic restoring force of the elastic reset member 5, so that they can be engaged with another gear position 211 of the engaging portion 21. At this time, the backrest 2 can be locked at the current angle position again. When the user gets off the vehicle and needs to adjust the angle of the backrest 2, the user can operate the second operating handle 7 with one hand, so that the second operating handle 7 rotates to drive the locking member 3 to slide downward along the slide groove 11, thereby unlocking the backrest 2. The unlocking and backrest 2 adjustment principles are the same as above and will not be repeated here.

[0029] Compared with the prior art, the utility model pivotally connects the backrest 2 to the seat body 1 so that the backrest 2 can rotate relative to the seat body 1, and then sets locking members 3 on both sides of the backrest 2, sets gears 211 with different angles at the lower end of the backrest 2, and uses the locking members 3 to lock on each gear 211, so that the backrest 2 is positioned at different angles, so that the backrest 2 can achieve the purpose of adjusting the angle. In addition, by setting a linkage mechanism 4 between the two locking members 3, the linkage mechanism 4 is used to transfer the driving force received by the locking member 3 on one side to the locking member 3 on the other side, so that the locking members 3 on both sides are simultaneously stressed, and can move synchronously, so as to achieve the purpose of synchronously locking or releasing the backrest 2. Therefore, the user only needs to use one hand to drive the locking member 3 on one side to achieve the purpose of locking or releasing the two sides of the backrest 2, avoiding the need for the user to operate with both hands, and the operation is simpler and more convenient.

[0030] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A seat with an adjustable backrest angle, characterized in that: It includes a base body, a backrest and two locking members, the backrest is pivotally connected to the base body, and the pivot axis is located between the upper and lower ends of the backrest; the two locking members are respectively arranged on opposite sides of the base body; the lower end of the backrest is provided with a clamping part, the clamping part is provided with at least two gears located at different angles, the base body is provided with a locking position and a release position, and the locking member is movably arranged between the locking position and the release position; a linkage mechanism is connected between the two locking members to enable the two locking members to move synchronously; when the locking member is in the release position, the locking member is disengaged from the clamping part, so that the backrest can be rotated around the pivot axis to adjust the angle; when the locking member is in the locking position, the locking member is clamped in one of the gears of the clamping part to lock the backrest at this angular position.

2. The seat with adjustable backrest angle as claimed in claim 1, characterized in that: The linkage mechanism includes a pair of first connecting rods, a pair of second connecting rods and a rotating shaft. One end of the first connecting rod is pivotally connected to the locking member located on that side, the other end of the first connecting rod is pivotally connected to one end of the second connecting rod located on that side, the other end of the second connecting rod located on that side is fixedly connected to the rotating shaft, and the rotating shaft is pivotally connected to the base body.

3. The seat with adjustable backrest angle as claimed in claim 1, characterized in that: The seat body is provided with a slide groove, one end of the slide groove close to the engaging portion is the locking position, and the end away from the engaging portion is the releasing position. The locking member is an axle pin, and the axle pin is movably arranged in the slide groove.

4. The seat with adjustable backrest angle as claimed in claim 3, characterized in that: The seat body has a mounting seat; the backrest is pivotally connected to the mounting seat, and the slide slot is arranged on the mounting seat.

5. The seat with adjustable backrest angle as claimed in claim 1, characterized in that: The seat with adjustable backrest angle further comprises a first operating handle; the first operating handle is connected to the locking member to drive the locking member to move.

6. The seat with adjustable backrest angle as claimed in claim 5, characterized in that: The first operating handle is pivotally connected to the mounting seat of the seat body through a rotating shaft, and the first operating handle drives the locking member to move when rotating around the rotating shaft.

7. The seat with adjustable backrest angle as claimed in claim 6, characterized in that: The seat with adjustable backrest angle also includes a second operating handle; the second operating handle is coaxially pivoted to the mounting seat with the first operating handle, and the second operating handle is connected to the locking member to drive the locking member to move.

8. The seat with adjustable backrest angle as claimed in claim 4, characterized in that: The mounting seat is provided with a limiting portion to limit the maximum angle of rotation of the backrest relative to the seat body.

9. The seat with adjustable backrest angle as claimed in claim 1, characterized in that: The seat with adjustable backrest angle further comprises an elastic reset member, which is arranged between the locking member and the mounting seat of the seat body so as to provide an elastic force to move the locking member to the locking position.

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