wheelchair

Abstract

The application provides a wheelchair, comprising: a seat, a backrest being mounted at the rear end of the seat, the backrest comprising a backrest body fixed to the seat and a movable backrest slidably mounted to the seat; a seat cushion rotatably mounted to the seat; a driving assembly mounted to the seat, the driving assembly comprising a driver mounted to the seat and a lead screw rotatably connected to the driver; a linkage assembly movably mounted to the seat, the linkage assembly comprising a lead screw nut matched with the lead screw, a first push rod and a second push rod rotatably mounted to the lead screw nut, a sliding block rotatably mounted to the first push rod, two lifting rods fixed to both sides of the sliding block and rotatably contacting the bottom surface of the seat cushion, and the second push rod being rotatably connected to the movable backrest. The seat cushion of the wheelchair provided by the application can help the user to stand up, and the movable backrest can also provide support for the user to stand up, so that the user is safer and more reliable when standing up.

Description

Technical Field

[0001] This invention relates to the field of wheelchair technology, and in particular to a wheelchair. Background Technology

[0002] Wheelchair users are mostly people with mobility issues, such as people with disabilities, patients, or the elderly, who usually need to use a wheelchair to get around.

[0003] When wheelchair users stand up, their center of gravity shifts upward, requiring significant leg strength to overcome their body weight, which is inconvenient for wheelchair users. In existing technologies, many smart wheelchairs help users stand up by flipping the seat cushion, but when users stand up, only the seat cushion provides support, and there is no support point for the back, so it is not safe for users to stand up.

[0004] Therefore, a new type of wheelchair is needed to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems of the prior art, the present invention provides a wheelchair that can help users get up while also providing support.

[0006] The technical solution adopted by this invention to solve the technical problem is as follows:

[0007] A wheelchair includes: a seat with a backrest mounted at its rear end, the backrest including a backrest body fixed to the seat and a movable backrest slidably mounted to the seat; a seat cushion rotatably mounted to the seat; a drive assembly mounted to the seat, the drive assembly including a driver mounted to the seat and a lead screw rotatably connected to the driver; and a linkage assembly movably mounted to the seat, the linkage assembly including a lead screw nut matching the lead screw, a first push rod and a second push rod rotatably mounted on the lead screw nut, a slider rotatably mounted on the first push rod, and two lifting rods fixed to both sides of the slider and rotatably contacting the bottom surface of the seat cushion, the second push rod being rotatably connected to the movable backrest.

[0008] Preferably, the seat includes a front wheel and a rear wheel respectively mounted at its front end and rear end; the movable backrest has two downwardly extending portions below it, and the ends of the two extension portions each have two connecting portions extending toward the rear wheel on the same side; the seat is provided with a first guide rail corresponding to the positions of the two connecting portions, and the ends of the two connecting portions are slidably mounted on the first guide rail.

[0009] Preferably, the seat has a support member extending horizontally towards the front wheel on the side near the backrest, and a guide rod extending downward on the side of the support member away from the backrest, with the slider movably mounted on the guide rod.

[0010] Preferably, the lead screw nut includes a body portion and two crossbars extending from both sides of the body portion toward the rear wheel on the same side. The seat is provided with a second guide rail corresponding to the end positions of the two crossbars, and the ends of the two crossbars are slidably mounted on the second guide rails.

[0011] Preferably, one end of the first push rod is rotatably mounted on the side of the body near the seat cushion, and the other end is rotatably connected to the slider.

[0012] Preferably, the second push rod includes two rods, one end of each second push rod is rotatably mounted on the side of the two crossbars near the seat cushion, and the other end is rotatably mounted on the two connecting parts.

[0013] Preferably, each of the two lifting rods is equipped with a pulley at one end near the bottom of the seat cushion, and the pulley is in rotatable contact with the bottom of the seat cushion.

[0014] Preferably, the seat is provided with armrests on both sides near the rear wheel. The bottom surface of the armrest is provided with a third guide rail and a connecting rod. One end of the connecting rod is rotatably connected to the bottom surface of the armrest and the third guide rail, and the other end is rotatably connected to the crossbar and the seat.

[0015] Preferably, the connecting rod includes 2n auxiliary rods (n is a positive integer); when n=1, the connecting rod includes a first auxiliary rod and a second auxiliary rod, the first auxiliary rod and the second auxiliary rod are rotatably connected at the midpoint; one end of the first auxiliary rod is rotatably mounted on the bottom surface of the armrest, and the other end is rotatably mounted on the crossbar; one end of the second auxiliary rod is rotatably and slidably mounted on the third guide rail, and the other end is rotatably mounted on the seat.

[0016] Compared with the prior art, the present invention has the following main advantages:

[0017] When a user sits on the cushion, the drive assembly drives the linkage assembly to move. As the linkage assembly lifts the cushion, the movable backrest moves towards the front of the seat along with the linkage assembly. The connecting rod also moves with the linkage assembly to lift the armrest. While the cushion helps the user get up, the movable backrest and the armrest also provide support for the user to get up, making it safer and more reliable for the user to get up. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the wheelchair provided by the present invention;

[0020] Figure 2 This is a partial structural schematic diagram of the wheelchair provided by the present invention;

[0021] Figure 3 This is a schematic diagram of the exploded structure of the wheelchair provided by the present invention. Detailed Implementation

[0022] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0024] The wheelchair 100 provided in this application embodiment includes: a seat 1, a cushion 2, a drive assembly 3, a linkage assembly 4, and armrests 5.

[0025] Specifically, the seat 1 has a front wheel 10 and a rear wheel 11 respectively mounted at its front and rear ends. The rear wheel 11 is equipped with a motor 111, which drives the rear wheel 11 to rotate, thereby propelling the wheelchair 100 forward or backward. The seat 1 also has a backrest 12, which includes a backrest body 121 and a movable backrest 122. The backrest body 121 is fixedly mounted to the rear end of the seat 1. The movable backrest 122 has two downwardly extending extensions 1221 below it, and the ends of the two extensions 1221 respectively extend towards the rear wheel 11 on the same side. Two extended connecting portions 1222; the seat 1 is provided with a first guide rail 13 corresponding to the positions of the two connecting portions 1222, and the ends of the two connecting portions 1222 are respectively slidably mounted on the first guide rail 13; the seat 1 has a support member 15 extending horizontally towards the front wheel 10 on the side near the backrest 12, and a guide rod 16 extending downward on the side of the support member away from the backrest 12. The support member 15 and the guide rod 16 can support the seat cushion 2, and the guide rod 16 can provide guidance for the seat cushion 2 to flip.

[0026] The seat cushion 2 is rotatably mounted on the front end of the seat 1, and the user can sit on the seat cushion 2. The seat cushion 2 can be mounted on the front end of the seat 1 via a hinge. When the seat cushion 2 is in a horizontal state, the seat 1 and the support member 15 can bear the pressure of the seat cushion 2. The seat cushion 2 can be flipped around the front end of the seat 1 with the cooperation of the drive assembly 3 and the linkage assembly 4.

[0027] The drive assembly 3 includes a lead screw 31 and a driver 32. The linkage assembly 4 includes a lead screw nut 41 sleeved on and cooperating with the lead screw 31, a first push rod 42 and a second push rod 43 rotatably mounted on the lead screw nut 41, a slider 44 rotatably mounted on the first push rod 42 and sleeved on the guide rod 16, and two lifting rods 45 fixed on both sides of the slider 44 and rotatably contacting the bottom surface of the seat cushion 2.

[0028] Specifically, the lead screw nut 41 includes a body part 411 and two crossbars 412 extending from both sides of the body part 411 toward the rear wheel 11 on the same side; the seat 1 is provided with second guide rails 14 at the positions corresponding to the ends of the two crossbars 412, and the ends of the two crossbars 412 are slidably mounted on the second guide rails 14; one end of the first push rod 42 is rotatably mounted on the side of the body part 411 near the seat cushion 2, and the other end is rotatably connected to the slider 44; the second push rod 43 includes two rods, located on both sides of the first push rod 42, one end of the two second push rods 43 is rotatably mounted on the side of the two crossbars 412 near the seat cushion 2, and the other end is rotatably mounted on the two connecting parts 1222; the two lifting rods 45 are respectively equipped with pulleys 451 at the ends near the bottom surface of the seat cushion 2, and the pulleys 451 can effectively reduce the friction force experienced by the seat cushion during the lifting process.

[0029] When the lead screw 31 drives the lead screw nut 41 to move forward, the first push rod 42 pushes the slider 44 to rise along the guide rod 16, and the lifting rod 45 follows the slider 44 to rise, thereby lifting the seat cushion 2 and causing it to flip around the front end of the seat 1. During the forward movement of the lead screw nut 41, the two crossbars 412 move forward along the second guide rail 14 and pull the second push rod 43, thereby driving the movable backrest 12 to move forward along the first guide rail 13. This design allows the seat cushion 2 to flip upward while the movable backrest 12 also moves forward, providing support for the user when getting up, making it safer and more reliable for the user to get up.

[0030] The seat 1 is equipped with armrests 5 on both sides near the rear wheel 11. The armrests 5 are rotatably connected to the seat 1 and the two crossbars 412 via connecting rods 51. Specifically, the bottom surface of the armrest 5 is provided with a third guide rail 52. The connecting rod 51 includes a first auxiliary rod 511, a second auxiliary rod 512, a third auxiliary rod 513, and a fourth auxiliary rod 514. The first auxiliary rod 511 and the second auxiliary rod 512 are rotatably connected at their midpoints, and the third auxiliary rod 513 and the fourth auxiliary rod 514 are rotatably connected at their midpoints. One end of the first auxiliary rod 512 is rotatably connected to the bottom surface of the armrest 5, and its other end is rotatably connected to one end of the third auxiliary rod 513. The other end of the third auxiliary rod 513 is rotatably connected to the seat 1. The second auxiliary rod 511... One end of the second auxiliary rod 12 is slidably and rotatably connected to the third guide rail 52, and the other end is rotatably connected to one end of the fourth auxiliary rod 514, while the other end of the fourth auxiliary rod 514 is rotatably connected to the crossbar 412. When the lead screw nut 41 drives the crossbar 412 to move forward, one end of the second auxiliary rod 512 slides along the third guide rail 52, and one end of the fourth auxiliary rod 514 follows the crossbar 412 to slide along the second guide rail 14. Therefore, the height of the connecting rod 51 increases, and the armrest 5 also increases accordingly. This design allows the seat cushion 2 to flip upward and the movable backrest 12 to move forward at the same time, while the armrest 5 also increases with the connecting rod 51. The armrest 5 can provide support for the user when getting up, making it safer and more reliable for the user to get up.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wheelchair, characterized in that, include: A seat includes a front wheel and a rear wheel respectively mounted at its front and rear ends; a backrest is mounted at the rear end of the seat, the backrest including a backrest body fixed to the seat and a movable backrest slidably mounted on the seat; the movable backrest has two downwardly extending extensions below it, the ends of the two extensions each having two connecting portions extending toward the rear wheel on the same side; the seat is provided with first guide rails corresponding to the positions of the two connecting portions, the ends of the two connecting portions being slidably mounted on the first guide rails; A seat cushion is rotatably mounted to the front end of the seat; the seat has a support extending horizontally toward the front wheel on the side near the backrest, and a guide rod extending downward on the side away from the backrest. A drive assembly, mounted on the seat, the drive assembly including a driver mounted on the seat and a lead screw rotatably connected to the driver; A linkage assembly is movably installed on the seat. The linkage assembly includes a lead screw nut that matches the lead screw, two lifting rods, and a first push rod and a second push rod that are rotatably installed on the lead screw nut. The lead screw nut includes a main body and two crossbars extending from both sides of the main body toward the rear wheel on the same side. The seat is provided with a second guide rail at the end position of the two crossbars respectively, and the ends of the two crossbars are slidably mounted on the second guide rails respectively. One end of the first push rod is rotatably mounted on the side of the main body near the seat cushion, and the other end is rotatably connected to a slider, which is movably mounted on the guide rod; The two lifting rods are respectively fixed to both sides of the slider, and the two lifting rods are rotatably in contact with the bottom surface of the seat cushion; The second push rod includes two rods, one end of which is rotatably mounted on the side of the two crossbars near the seat cushion, and the other end is rotatably mounted on the two connecting parts.

2. The wheelchair according to claim 1, characterized in that, The two lifting rods are each equipped with a pulley at one end near the bottom of the seat cushion, and the pulleys are in rotatable contact with the bottom of the seat cushion.

3. The wheelchair according to claim 2, characterized in that, The seat is also provided with armrests on both sides near the rear wheel. The bottom surface of the armrest is provided with a third guide rail and a connecting rod. One end of the connecting rod is rotatably connected to the bottom surface of the armrest and the third guide rail, and the other end is rotatably connected to the crossbar and the seat.

4. The wheelchair according to claim 3, characterized in that, The connecting rod includes 2n auxiliary rods, where n is a positive integer; when n=1, the connecting rod includes a first auxiliary rod and a second auxiliary rod, and the first auxiliary rod and the second auxiliary rod are rotatably connected at their midpoints; one end of the first auxiliary rod is rotatably mounted on the bottom surface of the armrest, and the other end is rotatably mounted on the crossbar; one end of the second auxiliary rod is rotatably and slidably mounted on the third guide rail, and the other end is rotatably mounted on the seat.

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