BACKREST ADJUSTING MECHANISM AND A SEAT WITH THE SAME

Abstract

The backrest adjusting mechanism comprises a base, a cushion, a supporting frame, a backrest, an air pressure rod, a connecting rod and a steel wire core; the cushion is fixed to a top of the adjusting base; the supporting frame is rotationally connected to a rear end of the adjusting base; the backrest is fixed on the supporting frame; the air pressure rod is rotationally connected with the supporting frame; the rear end of the base is provided with a fixing frame; the connecting rod is rotationally connected with the fixing frame and a movable rod; the connecting rod and the fixing frame are provided with a limiting block; when the backrest is used, two of the limiting block are propped against each other to fix the backrest at a specific position.

Claims

1. The backrest adjusting mechanism, wherein comprising an adjusting base, a cushion, a supporting frame, a backrest, an air pressure rod, a connecting rod and a steel wire core; said cushion is fixed to a top of said base; said supporting frame is rotationally connected to a rear end of said base; said backrest is fixed on said supporting frame; said air pressure rod is rotationally connected with said supporting frame; said rear end of said base is provided with a fixing frame; one end of said connecting rod is rotationally connected on said fixing frame, the other end of said connecting rod is rotationally connected with a movable rod of said air pressure rod; both of said connecting rod and said fixing frame are provided with a limiting block; when said backrest is used, two of said limiting block are propped against each other to fix said backrest at a specific position; one side of said adjusting base is actively connected with a buckle plate; one end of said steel wire core is fixed on a valve core switch of said air pressure rod, the other end of said steel wire core is fixed on said buckle plate.

2. The backrest adjusting mechanism according to claim 1, wherein said air pressure rod can drive an included angle between said backrest and said adjusting base to be changed in a range of 100°˜120°.

3. The backrest adjusting mechanism according to claim 1, wherein a bottom of said adjusting base is provided with a protective tube, one end of said protective tube is fixed on said adjusting base, the other end of said protective tube is fixed on said movable rod of said air pressure rod; said steel wire core is received in said protective tube.

4. The backrest adjusting mechanism according to claim 1, wherein one side of said adjusting base is fixed with with two lower supporting lugs; two ends of said buckle plate are actively connected with said two lower supporting lugs.

5. The backrest adjusting mechanism according to claim 1, wherein a rear end of said supporting frame is fixed with two upper supporting lugs; said air pressure rod is rotationally connected on said two upper supporting lugs.

6. The backrest adjusting mechanism according to claim 1, wherein two ends of said steel wire core are respectively provided with a clamping block; said buckle plate and said valve core switch of said air pressure rod are respectively provided with a clamping groove corresponding to said clamping block; said clamping block is clamped in said clamping groove.

7. The backrest adjusting mechanism according to claim 1, wherein said bottom of said base is provided with a plurality of mounting holes and a plurality of mounting grooves.

8. A seat with an adjustable backrest, comprising a cushion and a backrest, said backrest is rotationally connected with one side of said cushion, wherein a bottom of said cushion is provided with an adjusting base, said adjusting base is provided with a backrest adjusting mechanism for adjusting a rotating angle of said backrest; said backrest adjusting, mechanism comprises an adjusting handle, a limiting sliding block, an air pressure rod and a steel inhaul cable; said adjusting base comprises an adjusting plate installed at said bottom of said cushion, and a supporting plate extending upwards along one side of said adjusting plate; one end of said adjusting handle is rotationally connected on said adjusting plate, and the other end is a free end, which extends out of said cushion, forming a handle for a user to apply force; said limiting sliding block is sliding connection with said supporting plate, one side, close to said adjusting plate, of said limiting sliding block is fixed with a rotating shaft, the other side, far away from said adjusting plate, is propped against said bottom of said backrest; a cylinder body of said air pressure rod is rotationally connected with said rotating shaft; a movable rod of said air pressure rod is fixed on said adjusting plate; and said movable rod is provided with a valve core switch, which is used to control opening or closing of said air pressure rod; said steel inhaul cable is actively connected on said adjusting plate, one end of said steel inhaul cable is fixed with said valve core switch, the other end of said steel inhaul cable is fixed with said adjusting handle; in using, pulling said adjusting handle outwards for pulling said steel inhaul cable to open said valve core switch, so that said movable rod of said air pressure rod can do telescopic movement, and push said limiting sliding block to move upwards and downwards along said supporting plate.

9. The seat with an adjustable backrest according to claim 8, wherein said rotating angle that said backrest can be rotated is in a range of 0°˜120°.

10. The seat with an adjustable backrest according to claim 8, wherein said limiting sliding block is provided with sliding, columns, said supporting plate is provided with sliding grooves corresponding to said sliding columns; said sliding columns extend into said sliding grooves and are sliding connection with said sliding grooves.

11. The seat with an adjustable backrest according to claim 10, wherein each of said sliding grooves is provided with an elastic buffer piece, one end of which is fixed with said sliding groove, the other end is propped against one side of said limiting sliding block close to said cushion.

12. A seat with an adjustable backrest includes a cushion and a backrest, said backrest is rotationally connected on one side of said cushion, wherein a bottom of said cushion is equipped with an adjusting base, said adjusting base is provided with a backrest adjusting mechanism for adjusting a rotating angle of said backrest; said backrest adjusting mechanism comprises an adjusting handle, a limiting sliding block, and a torsion spring; said adjusting base comprises an adjusting plate installed at said bottom of said cushion, and a supporting plate extending upwards along one side of said adjusting plate, said adjusting plate is provided with a clamping part; said limiting sliding block is sliding connection with said supporting plate, one side, close to said adjusting plate, of said limiting sliding block is fixed with a rotating shaft, the other side, far away from said adjusting plate, is propped against said bottom of said backrest; one end of said adjusting handle is fixed with a gear adjusting block, the other end of said adjusting handle extends out of said adjusting base forming a handle for pulling; said gear adjusting block is provided with a clamping block actively connected with said clamping part, and a connecting part rotationally connected on said rotating shaft; said torsion spring is sleeved on said rotating shaft, two ends thereof are respectively extended with a torsion arm, one of said torsion arms is fixedly connected with said gear adjusting block, the other of said torsion arms is fixed with said limiting sliding block.

13. The seat with an adjustable backrest according to claim 12, wherein said rotating angle that said backrest can be rotated is in a range of 0°˜130°.

14. The seat with an adjustable backrest according to claim 13, wherein said clamping part is composed of three clamping grooves arranged in turn from a left to a right, when assembling, said clamping block is just located in any one of said three clamping grooves.

15. The seat with an adjustable backrest according to claim 14, wherein a bump is arranged between two adjacent said clamping grooves, a left side of said bump is provided with a circular arc part connected with a top of a right, side wall of said clamping grooves.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG. 1 is a perspective view of the backrest adjusting mechanism according to an embodiment in the present invention in a using state;

[0048] FIG. 2 is an enlarged view of A in FIG. 1;

[0049] FIG. 3 is a local decomposition view of the backrest adjusting mechanism according to the present invention;

[0050] FIG. 4 is a perspective view of the backrest adjusting mechanism according to the present invention in a folded state;

[0051] FIG. 5 is a perspective view of the backrest adjusting mechanism according to the other embodiment in the present invention;

[0052] FIG. 6 is a perspective view of the backrest adjusting mechanism shown in FIG. 5 in other view angle;

[0053] FIG. 7 is a decomposition view of the backrest adjusting mechanism shown in FIG. 5;

[0054] FIG. 8 is a perspective view of the backrest adjusting mechanism according to another embodiment in the present invention;

[0055] FIG. 9 is a perspective view of the backrest and cushion folded in the backrest adjusting mechanism shown in FIG. 8;

[0056] FIG. 10 is the other perspective view of the backrest adjusting mechanism shown in FIG. 8 in the other view angle;

[0057] FIG. 11 is a decomposition view of the backrest adjusting mechanism removed the cushion shown in FIG. 8;

[0058] FIG. 12 is another perspective view of the backrest adjusting mechanism shown in FIG. 8 in the other view angle;

[0059] FIG. 13 is an enlarged view of A in FIG. 12.

DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

[0060] In order to make the purpose of the present invention, technical solution and advantages are more clearly understood, with reference to the accompanying drawings and examples, the present invention is further explained in detail. It should be understood that the specific embodiment described herein is only for explaining the present invention, and not for defining the present invention.

[0061] It should be noted that, when the element is referred to as “fixed to” or “set on” another element, it can be directly on the other element or may exist in the middle element at the same time; When one element is referred to as “connected to” another element, it may be directly connected to another element or may be present at the same time as the centering element.

Embodiment One

[0062] Referring to FIG. 1 to FIG. 4, a backrest adjusting mechanism includes a base 10, a cushion 1, a supporting frame 3, a backrest 2, an air pressure rod 20, a connecting rod 4 and a steel wire core 54.

[0063] The cushion 1 is fixed to a top of the base 10; the supporting frame 3 is rotationally connected to a rear end of the adjusting 10; the backrest 2 is fixed on the supporting frame 3; the air pressure rod 20 is rotationally connected with the supporting frame 3; the rear end of the adjusting base 10 is provided with a fixing frame 6; one end of the connecting rod 4 is rotationally connected on the fixing frame 6 the other end of the connecting rod 4 is rotationally connected with a movable rod 21 in the air pressure rod 20; both of the connecting rod 4 and the fixing frame 6 are provided with a limiting block 7; when the backrest 2 is used, two of the limiting blocks 7 are propped against each other to fix the backrest 2 at a specific position; one side of the adjusting base 10 is actively connected with a buckle plate 30; one end of the steel wire core 54 is fixed on a valve core switch 22 of the air pressure rod 20, the other end of the steel wire core 54 is fixed on the buckle plate 30.

[0064] In a preferably technical scheme in the present invention, the air pressure rod 20 can drive the rotating angle between the backrest 2 and the adjusting base 10 to be changed in a range of 100°˜120°.

[0065] In a preferably technical scheme in the present invention, the steel wire core 54 is in a protective tube 51 used for avoiding the damage of the steel wire core 54.

[0066] In a preferably technical scheme in the present invention, one side of the adjusting base 10 is fixed with with two lower supporting lugs 8; two ends of the buckle plate 30 are actively connected on the two lower supporting lugs 8.

[0067] In a preferably technical scheme in the present invention, the back end of the supporting frame 3 is fixed with two upper supporting lugs 9; the air pressure rod 20 is rotationally connected on the two upper supporting lugs 9.

[0068] In a preferably technical scheme in the present invention, two ends of the steel wire core 54 are respectively provided with a clamping block 52; the buckle plate 30 and the valve core switch 22 of the air pressure rod 20 are provided with a clamping groove 53 corresponding to the clamping block 52; the clamping block 52 is clamped in the clamping groove 53.

[0069] In a preferably technical scheme in the present invention, the bottom of the adjusting base 10 is provided with a plurality of mounting holes 18 and mounting grooves 19.

[0070] The working process of the present invention is as follows:

[0071] when using the electric vehicle, the backrest 2 on the seat is pulled up, the limiting block ‘7’ of the fixing frame 6 and the limiting block 7 of the connecting rod 4 are propped against each other, at this time, the included angle α between the backrest 2 and the cushion 1 is 100°, then by pulling the buckle plate 30 to drive the steel inhaul cable 50 to trigger the valve core switch 22 of the air pressure rod 20. The air pressure rod 20 generates a force to push the backrest 2, while the user applies force to the back rest 2 through the user's back or hand to push the movable rod 21 of the the air pressure rod 20 inwards, so as to control the included angle α between the backrest 2 and the cushion 1 at any suitable angle. Loosening the buckle plate 30 to make the steel wire core 54 recovery, so that the valve core switch 22 of the air pressure rod 20 is closed, the backrest 2 and the cushion 1 is fixed at a corresponding position.

Embodiment 2

[0072] Please referring to FIG. 5-7, a backrest adjusting mechanism includes a cushion 1 and a backrest 2, the backrest 2 is rotationally connected on one side of the cushion 1, a bottom of the cushion 1 is provided with an adjusting base 10, the adjusting base 10 is provided with a backrest adjusting mechanism 40 for adjusting the rotating angle of the backrest 2 backwards; the backrest adjusting mechanism 40 comprises an adjusting handle 41, a limiting sliding block 42, an air pressure rod 20 and a steel inhaul cable 50.

[0073] The adjusting base 10 comprises an adjusting plate 11 installed at the bottom of the cushion 1, and a supporting plate 12 extending upwards along one side of the adjusting plate 11.

[0074] One end of the adjusting handle 41 is rotationally connected with the adjusting plate 11, the other end of the adjusting handle 41 extends out of the cushion 1, forming a handle 45 for the user to apply force.

[0075] The limiting sliding block 42 is sliding connection with the supporting plate 12. One side, close to the adjusting plate 11, of the limiting sliding block 42 42 is fixed with a rotating shaft 44, one side, far away from the adjusting plate 11, is propped against the bottom of the backrest 2.

[0076] The cylinder body of the air pressure rod 20 is rotationally connected with the rotating shaft 44; the movable rod 21 of the air pressure rod 20 is fixed on the adjusting plate 11; and the air pressure rod 20 is provided with a valve core switch 22, which is used to control the opening or closing of the air pressure rod 20. When the valve core switch 22 is opening, the movable rod 21 of the air pressure rod 20 can do telescopic movement. When the valve core switch 22 is closed, the movable rod 21 of the air pressure rod 20 is fixed, it can not do telescopic movement any more.

[0077] The steel inhaul cable 50 is actively connected on the adjusting plate 11, one end of the steel inhaul cable 50 is fixed with the valve core switch 22 the other end of the the steel inhaul cable 50 is fixed with the adjusting handle.

[0078] When using, pulling the adjusting handle 11 outwards, for pulling the steel inhaul cable 50 to open the valve core switch 22, so that the movable rod 21 of the air pressure rod 20 can do telescopic movement, and push the limiting sliding block 42 to move upwards and downwards along the supporting plate 12.

[0079] Preferably, the rotating angle that the backrest 2 can be rotated is in a range of 0°˜120°.

[0080] Preferably, the steal inhaul cable 50 includes a protective tube 51, a steel wire core 54, the protective tube 51 is sleeved on the outer surface of the steel wire core 54, the steel wire core 54 is sliding connection in the protective tube 51.

[0081] Preferably, the limiting sliding block 42 is provided with sliding columns 421, the supporting plate 12 is provided with sliding grooves 121 corresponding to the positions of the sliding columns 421; the sliding columns 421 extend into the sliding grooves 121, and are sliding connection with the sliding groove 121.

[0082] Preferably, each of the sliding grooves 121 is provided with an elastic buffer piece 123, one end of which is fixed with the sliding groove 121, the other end is propped against one side of the limiting sliding block 42 close to the cushion 1.

[0083] The working principle of the present invention is as follows:

[0084] when the backrest 2 and the cushion 1 is in a folded state, the included angle α is equal to 0, at this time, the backrest 2 and the limiting sliding block 42 are separated.

[0085] When the backrest 2 is opened, the included angle α is equal to 100°, at this time, the bottom of the backrest 2 and the top part of the limiting sliding block 42 is propped against for limiting the backrest 2 to rotate backwards.

[0086] When the user adjusts the backrest 2, only needs to pull the adjusting handle 41, the adjusting handle 41 pulls the steel inhaul cable 50, the other end of which pulls the valve core switch 22 of the air pressure rod 20, so that the movable rod 21 of the air pressure rod 20 can do telescopic movement.

[0087] At this time, the user controls the backrest 2 to be folded forwards or be rotated backwards by his hand or his back, such as the backrest 2 to continue to rotate backwards (i.e., the backrest 2 continues to rotate along the B direction shown in FIG. 5), the backrest 2 can push the limiting sliding block 42 to move downwards. The movable rod 21 of the air pressure rod 20 can do shrink motion driving the cylinder body of the air pressure rod 20 to move, the cylinder body of the air pressure rod 20 drives the limiting sliding block 42 to move downwards until the backrest 2 rotates to a specified angle, then releases the adjusting handle 41, then the valve core switch 22 is closed, the movable rod 21 of the air pressure rod 20 stops moving for fixing the limiting sliding block 42 and making it not continuously move. But also because the backrest 2 and the limiting sliding block 42 are propped against each other, the backrest 2 can not rotate to the right, so as to finish the adjustment of the backrest 2.

[0088] Although it should be noted that when 100°≤α≤120°, the backrest 2 can be randomly adjusted at any of the rotating angle, that, only by pulling the adjusting handle 41 to drive the steel inhaul cable 50 to open or close the valve core switch 22 of the air pressure rod 20, can realize the adjustment of the backrest 2.

[0089] In the present invention, using the air pressure rod 20 to drive the limiting sliding block 42 to move, the limiting sliding block 42 can randomly be adjusted the moving distance in the stroke range of the movable rod 21 of the air pressure rod 20, it is easier to meet the needs of the different user. The users release the adjusting handle 41 at any position in, the stroke rang of the movable rod 21 of the air pressure rod 20 to close the valve core switch 22, that is to say the length of the movable rod 21 is fixed at a certain position, finishing the adjustment of the backrest 2. And in the process of the air pressure rod 20 being pushed, the moving speed of the movable rod 21 is stable, combining that the elastic buffer piece 123 realizes shock absorption to the limiting sliding block 42, which can avoid the adjustment speed of the backrest 2 too fast, and accompanied with impact, vibration and other problems.

Embodiment 3

[0090] Referring to FIG. 8-12, the backrest adjustable seat includes a cushion 1 and a backrest 2, the backrest 2 is rotationally connected on one side of the cushion 1, the bottom of the cushion 1 is equipped with an adjusting base 10, the adjusting base 10 is provided with a backrest adjusting mechanism 40 for adjusting the rotating angle of the backrest 2 backwards.

[0091] Preferably, the backrest adjusting mechanism 40 comprises an adjusting handle 41, a limiting sliding block 42, and a torsion spring 46.

[0092] The adjusting base 10 comprises an adjusting plate 11 installed at the bottom of the cushion 1, and a supporting plate 12 extending upwards along one side of the adjusting plate 11, the adjusting plate 11 is provided with a clamping part 60.

[0093] The limiting sliding block 42 is sliding connection with the supporting plate 12, one side, close to the adjusting plate 11, of the limiting sliding block 42 is fixed with a rotating shaft 44, one side, far away from the adjusting plate 11, is propped against the bottom of the backrest 2.

[0094] One end of the adjusting handle 41 is fixed with a gear adjusting block 47, the other end of the adjusting handle extends out of the adjusting base 10 forming a handle 45 for pulling; the gear adjusting block 47 is provided with a clamping block 471 actively connected with the clamping part 60 and a connecting part 472 rotationally connected with the rotating shaft 44.

[0095] The torsion spring 46 is sleeved on the rotating shaft 44, two ends thereof are respectively extended with a torsion arm, one end of the torsion arm is fixedly connected with the gear adjusting block 47, the other end of the torsion 46 is fixed with the limiting sliding block 42.

[0096] Preferably, the rotating angle that the backrest 2 can be rotated in a range of 0°˜130°.

[0097] Preferably, the clamping part 60 is, composed of three clamping grooves 61 arranged in turn from left to right, when assembling, the clamping block 471 is just located in any one of the three clamping grooves 61.

[0098] Preferably, a bump 62 is arranged between the two adjacent clamping grooves 61, the left side of the bump 62 is provided with a circular arc part 63 connected with the top of the right side wall of the clamping grooves 61. Accordingly, it is convenient for the clamping part 60 to move, improves the rationality of the structure of clamping grooves, and ensures that the clamping part 60 moves more smoothly.

[0099] Preferably, the limiting sliding block 42 is provided with sliding columns 421, the supporting plate 12 is provided with sliding grooves 121 corresponding to the position of the sliding columns 421; the sliding columns 421 extend into the sliding grooves 121, and are sliding connection with the sliding grooves 121.

[0100] Preferably, each of the sliding grooves 121 is provided with an elastic buffer piece 123, one end of the elastic buffer piece 123 is fixed with the sliding groove 121, the other end of the elastic buffer piece 123 is fixed with one side of the limiting sliding block 42 close to the adjusting plate 11. When the limiting sliding block 42 is pressed, it slides in the direction of the elastic buffer piece 123 and compresses the elastic buffer piece 123. The elastic buffer piece 123 plays a role in buffering the impact force between the backrest 2 and the limiting sliding block 42, thereby prolonging the service life of the seat. The elastic buffer piece 123 in the present invention is a spring.

[0101] Preferably, the clamping block 471 is located in the right one of the clamping grooves 61, the backrest 2 can rotate backwards at a angle 10°.

[0102] Preferably, the clamping block 471 is located in the left one of the clamping grooves 61, the backrest 2 can rotate backwards at a angle 30°.

[0103] The working principle of the present invention is as follows:

[0104] When the backrest 2 and the cushion 1 is in a folded state, the included angle α is equal to 0, at this time, the backrest 2 and the limiting sliding block 42 are separated.

[0105] When the backrest 2 is opened, the included angle α is equal to 100°, at this time, the bottom of the backrest 2 and the top part of the limiting sliding block 42 is propped against for limiting the backrest 2 to rotate backwards.

[0106] When the user applies downward force on the handle 45, the connecting, part 472 of the adjusting handle 41 is driven to rotate along the rotating shaft 44, thereby driving the clamping part 60 to move downwards and separating from the clamping grooves 61, so that the limiting sliding block 42 can move. At this time, the user properly applies force to the backrest 2, the backrest 2 rotates backwards and presses the limiting sliding block 42 downwards, the limiting sliding block 42 is connected with the gear adjusting block 47 to move from the right to the left. At the time when the backrest 2 rotates to the included angle α equal to 120°, the gear adjusting block 47 moves from the right clamping grooves 61 to the adjacent middle clamping groove 61. If the user releases the adjusting handle 41, the gear adjusting block 47 is clamped in the middle clamping groove 61 and can not move any more, namely finishing the adjustment of the backrest 2. Of course, when the backrest 2 rotates to the included angle α equal to 130°, the gear adjusting block 47 can be clamped into the left clamping groove 61, the backrest 2 reaches the maximum rotating angle.

[0107] The backrest adjustable mechanism with the reasonable structure, solves the problem that the backrest 2 of the existing electric scooter can only be fixed in a seat at a specific angle, for different users, the needs of the include angle between the backrest 2 and the cushion 1 is different, thus the inconvenience is caused.

[0108] The above is only the preferred embodiment of the present invention, the structure is not limited to the listed shape, any modification in the spirit and principle of the present invention, equivalent replacement and improvement and so on, are contained in the protection range of the present invention.