CN113143613B

CN113143613B - Multifunctional wheelchair

Info

Publication number: CN113143613B
Application number: CN202110416381.1A
Authority: CN
Inventors: 张恩光; 谢伯劲; 王暄; 张曼; 韦志历; 陈子杰; 洪玉纯; 杨嘉慧
Original assignee: Zhuhai Institute Of Science And Technology
Current assignee: Zhuhai Institute Of Science And Technology
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-08-19
Anticipated expiration: 2041-04-19
Also published as: CN113143613A

Abstract

The invention discloses a multifunctional wheelchair, which comprises an underframe, a sitting and leaning assembly, a roller assembly, a track inclination angle adjusting mechanism and an adjusting assembly for adjusting the height and the inclination angle of the cushion assembly, wherein the track inclination angle adjusting mechanism comprises a front electric push rod and a rear electric push rod which are arranged between the track assembly and the underframe; the roller assembly comprises two front rollers and two rear rollers, and the two front rollers and the two rear rollers are both arranged on the supporting legs which can swing back and forth; the adjusting component is arranged between the base frame and the cushion plate of the sitting and leaning component and used for adjusting the height and the inclination angle of the cushion plate so as to assist a wheelchair user to realize autonomous standing. The multifunctional wheelchair disclosed by the embodiment of the invention has multiple functions of going up and down stairs, assisting in standing and the like, and has the advantages of simple and reliable structure, high use safety and the like.

Description

Multifunctional wheelchair

Technical Field

The invention relates to a multifunctional wheelchair; and more particularly, to an electric wheelchair having functions of assisting standing and going up and down stairs.

Background

The wheelchair is widely used as a tool for riding instead of walking for people with mobility difficulties. With the increasing aging degree and the improvement of living standard of the society, there is an increasing demand for wheelchairs, particularly multifunctional wheelchairs, such as wheelchairs having the functions of walking and going up and down stairs.

Chinese patent document CN204016663U discloses an automatic wheelchair, which comprises a chassis, a seat, a track mechanism, a front wheel mechanism, a rear wheel mechanism and a controller. Wherein, the chassis is provided with an integral bearing box type structure; the crawler mechanism comprises a crawler, crawler wheels and a crawler driving device; the front wheel mechanism comprises a front wheel, a front wheel lifting unit and a front wheel lifting driving device; the rear wheel mechanism comprises a rear wheel, a rear wheel lifting unit and a rear wheel driving device; the controller is used for controlling the seat, the track mechanism, the front wheel mechanism and the rear wheel mechanism.

Chinese patent document CN108272567A discloses a crawler-type wheelchair, which comprises a seat, front driving wheels, rear supporting steering wheels, a frame, a crawler stair-climbing mechanism, a power assembly and a power supply system, wherein the seat is arranged on the frame, the front driving wheels are arranged on the front side of the frame and arranged on the two sides of the frame, the rear supporting steering wheels are arranged on the rear side of the frame, and the crawler stair-climbing mechanism, the power assembly and the power supply system are arranged on the frame; the power assembly is connected with the crawler stair climbing mechanism to drive the crawler stair climbing mechanism to operate so as to finish the actions of going upstairs and downstairs.

As disclosed in the above patent documents, conventional wheelchairs have a function of going up and down stairs in addition to a basic function of riding instead of walking. However, in general, these known wheelchairs are still functionally deficient (e.g. do not have a standing-assist function), and are often structurally complex, leaving room for further improvement.

Disclosure of Invention

The invention mainly aims to provide a multifunctional wheelchair which has multiple functions of going up and down stairs, assisting in standing and the like and is simple and reliable in structure.

In order to achieve the above-mentioned main object, an embodiment of the present invention provides a multifunctional wheelchair, including:

the bottom frame comprises an upper bottom plate and a lower bottom plate, and four corners of the upper bottom plate and the lower bottom plate are connected through hollow support rods; wherein, a battery is arranged between the upper base plate and the lower base plate;

the seat back assembly comprises a seat cushion plate, armrest parts arranged on the left side and the right side of the seat cushion plate and a backrest arranged on the rear side of the seat cushion plate; wherein, the cushion plate is movably loaded on the upper bottom plate, the backrest is hinged with the cushion plate, and an angle adjusting mechanism for adjusting the included angle between the cushion plate and the backrest is arranged between the cushion plate and the backrest;

the two adjusting components are respectively arranged on the left side and the right side of the underframe and are used for adjusting the height and the inclination angle of the cushion plate; the adjusting assembly comprises a motor, a lead screw transmission mechanism, a lower guide rail provided with a lower sliding block, an upper guide rail provided with an upper sliding block, a first scissor rod, a second scissor rod, a crank component and a connecting rod component; the crank member is fixedly connected with the cushion plate, the lower guide rail is fixed on the lower bottom plate, and the motor drives the lower sliding block to move on the lower guide rail through the lead screw transmission mechanism; two ends of the first scissor rod are respectively hinged with the front end of the lower guide rail and the upper sliding block, two ends of the second scissor rod are respectively hinged with the front end of the upper guide rail and the lower sliding block, and the middle parts of the first scissor rod and the second scissor rod are mutually hinged; one ends of the crank member and the connecting rod member are hinged with each other, and the other ends of the crank member and the connecting rod member are respectively hinged with the front end of the upper guide rail and the upper sliding block;

the roller assembly comprises two front rollers and two rear rollers, the two front rollers and the two rear rollers are arranged on corresponding supporting legs, the supporting legs form a hollow structure, and the supporting legs are hinged with the supporting rods and can swing back and forth; the support rod is internally provided with a first electric push rod, the lower end of the first electric push rod is connected with a central rod, and the first electric push rod can push the central rod to move between an extending position extending into the support leg and a retracting position retreating from the support leg;

the two crawler assemblies are respectively arranged on two sides below the underframe; the crawler assembly comprises a walking frame, a crawler driving mechanism, a plurality of driven supporting wheels and a side cover; the crawler driving mechanism is arranged at the longitudinal tail end of the walking frame and comprises a driving wheel meshed with the crawler and a motor driving the driving wheel to rotate; the driven supporting wheels are rotatably arranged on the left side and the right side of the walking frame and are meshed with the crawler belt; the side covers are arranged on the left side and the right side of the walking frame and cover the crawler driving mechanism and the driven supporting wheels;

the track inclination angle adjusting mechanism comprises a front electric push rod and a rear electric push rod which are arranged between a walking frame and a lower bottom plate, one ends of the front electric push rod and the rear electric push rod are hinged with the walking frame, the other ends of the front electric push rod and the rear electric push rod are connected with the lower bottom plate, and the inclination angle of the track is controlled by adjusting the lengths of the front electric push rod and the rear electric push rod.

According to a specific embodiment of the present invention, the angle adjustment mechanism includes a second electric push rod and a driven connecting rod, the second electric push rod is mounted on the lower surface of the cushion plate, one end of the driven connecting rod is hinged to the second electric push rod, and the other end of the driven connecting rod is connected to the backrest.

According to a specific embodiment of the invention, the left side armrest part or the right side armrest part forms a folding walking stick detachably connected with the cushion plate, the folding walking stick comprises a walking stick handle and a stick rod, the stick rod comprises an upper rod body, a middle rod body and a lower rod body which are sequentially connected, and two ends of the middle rod body are respectively hinged with the upper rod body and the lower rod body; the middle rod body is provided with a handrail plate which extends out from the two ends of the middle rod body.

According to a more specific embodiment of the invention, two ends of the middle rod body are provided with hinged joints, and the hinged joints are provided with hinged shafts; a pair of hinged side plates are arranged on the upper rod body and the lower rod body, waist-shaped hinged holes are formed in the hinged side plates, the hinged joint is arranged between the hinged side plates, and the hinged shaft is rotatably arranged in the waist-shaped hinged holes; the upper rod body and the lower rod body are provided with movable sleeves, and the movable sleeves can be fixed at the tail end of the middle rod body.

According to another more specific embodiment of the invention, the bottom end of the lower rod is fixed to the side of the seat plate by means of a thumbscrew, and the pole handle is positioned in a U-shaped limit groove in the side of the seat plate.

According to a specific embodiment of the invention, two front electric push rods and two rear electric push rods are arranged between the walking frame and the lower bottom plate, and the two front electric push rods and the two rear electric push rods are respectively arranged at the left side and the right side of the walking frame.

According to a specific embodiment of the invention, a plurality of supporting bulges distributed along the length direction of the walking frame are formed on the upper surface and the lower surface of the walking frame, and the tail ends of the supporting bulges are provided with balls; a circle of sliding grooves are formed in the center of the inner side of the crawler along the circumferential direction of the crawler, and the balls are abutted to the bottom surfaces of the sliding grooves.

According to an embodiment of the invention, both longitudinal ends of the walking frame are provided with said track drive.

According to a more specific embodiment of the invention, the multifunctional wheelchair further comprises two pedals and two pedal connecting rods which are arranged on the left and right, the lower ends of the pedal connecting rods are fixedly connected with the pedals, and the upper ends of the pedal connecting rods are hinged with the cushion plate.

According to a more specific embodiment of the invention, a headrest and two wheelchair handles are arranged above the backrest, and the two wheelchair handles are respectively positioned at the left side and the right side of the headrest.

The multifunctional wheelchair disclosed by the embodiment of the invention has the function of assisting in standing besides the functions of walking and going up and down stairs; the auxiliary standing function is realized by adjusting the height and the inclination angle of the cushion plate through the adjusting component, and the adjusting component is configured to simultaneously drive the cushion plate to do lifting motion and adjust the inclination angle through the same motor, so that the auxiliary standing cushion has the advantage of simple structure. In addition, the front idler wheel and the rear idler wheel are arranged in a swinging mode, height adjustment is carried out through swinging, an idler wheel lifting mechanism does not need to be arranged, and the structure of the wheelchair is also simplified. Furthermore, the armrest part forms a detachable folding walking stick which can be used as a walking stick after being detached and unfolded, so that greater convenience can be provided for a user.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The technical solution of the present invention, the above and other advantages will be more clearly embodied in the detailed description.

Drawings

FIG. 1 is a perspective view of an embodiment of the multi-function wheelchair of the present invention in a travel state;

FIG. 2 is a perspective view of an embodiment of the multi-function wheelchair of the present invention in a assisted-standing position;

FIG. 3 is a perspective view of a portion of an adjustment assembly in an embodiment of the present invention;

FIG. 4 is a perspective view of the left armrest portion in an embodiment of the present invention;

FIG. 5 is an enlarged fragmentary view of the dotted circle portion of FIG. 4;

FIG. 6 is a perspective view of the left armrest portion deployed as a cane in an embodiment of the present invention;

FIG. 7 is an exploded view of the track assembly of an embodiment of the present invention;

FIG. 8 is a perspective view of a front roller in an embodiment of the present invention;

FIG. 9 is an axial cross-sectional view of a front roller in an embodiment of the present invention;

FIG. 10 is a side elevational view of the multi-function wheelchair embodiment of the present invention in an up-stairs position;

figure 11 is a side elevational view of an embodiment of the multi-function wheelchair of the present invention in a down-stairs position.

Detailed Description

Fig. 1 and 2 show the overall construction of an embodiment of the multipurpose wheelchair of the present invention, in which fig. 1 shows the wheelchair in a state of walking on flat ground and fig. 2 shows the wheelchair in a state of assisting standing. Referring to fig. 1 and 2, the multi-function wheelchair of the embodiment of the present invention includes a base frame 10, a seating assembly 20, two front rollers 31, two rear rollers 32, two track assemblies 40, and a footrest assembly 80. The components are explained in detail below.

The base frame 10 comprises an upper base plate 11 and a lower base plate 12, four corners of the upper base plate 11 and the lower base plate 12 are connected through hollow support rods 13, and side baffles 14 are arranged on the left side and the right side of the upper base plate 11 and the lower base plate 12, so that the base frame 10 forms a roughly box structure. The battery 70 is disposed between the upper plate 11 and the lower plate 12 and can be taken out from the rear of the base frame 10 or charged.

The sitting and leaning assembly 20 comprises a sitting cushion plate 21, a seat cushion 22 and a backrest 23, wherein the sitting cushion plate 21 is movably supported on the upper bottom plate 11, the left side and the right side of the sitting cushion plate 21 are respectively provided with a left side armrest part 25 and a right side armrest part 24, the seat cushion 22 is arranged on the sitting cushion plate 21, and the backrest 23 is hinged with the rear side of the sitting cushion plate 21. An electric control device 242 is arranged on the armrest plate 241 of the right armrest part 24, and the electric control device 242 is used for controlling the operation of the wheelchair. A headrest 26 and two wheelchair handles 27 are provided above the backrest 23, and the two wheelchair handles 27 are respectively provided on the left and right sides of the headrest 26.

An angle adjusting mechanism for adjusting an included angle between the cushion plate 21 and the backrest 23 is arranged between the cushion plate 21 and the backrest 23, the angle adjusting mechanism comprises an electric push rod 281 and a driven connecting rod 282, the electric push rod 281 is installed on the lower surface of the cushion plate 21, one end of the driven connecting rod 282 is hinged to the electric push rod 281, and the other end of the driven connecting rod 282 is connected with the backrest 23. By controlling the length of the electric push rod 281, the angle between the cushion plate 21 and the backrest 23 can be adjusted.

The foot pedal assembly 80 is disposed at the front side of the chassis 10, and includes two foot pedals 81 and two foot pedal connecting rods 82 disposed at the left and right sides, and a leg shield/cloth 83 is sleeved on the two foot pedal connecting rods 82. The lower end of the pedal connecting rod 82 is fixedly connected with the pedal 81, and the upper end of the pedal connecting rod 82 is hinged with the front end of the cushion plate 21.

The left and right sides of the chassis 10 are respectively provided with one adjusting assembly 50, and the adjusting assemblies 50 are simultaneously positioned on the left and right sides of the battery 70. The adjustment assembly 50 is used to adjust the height and inclination of the cushion plate 21 to achieve the standing assistance function. In the embodiment of the present invention, as shown in fig. 3, the adjusting assembly 50 includes a motor 51, a lead screw transmission mechanism 52, a lower guide rail 53 provided with a lower slider 531, an upper guide rail 54 provided with an upper slider 541, a first scissor lever 55, a second scissor lever 56, a crank member 57 and a connecting rod member 58; the lower rail 53 is fixed to the lower base plate 12, and the motor 51 drives the lower slider 531 to move on the lower rail 53 through the screw drive mechanism 52. Two ends of the first scissor lever 55 are respectively hinged with the front end of the lower guide rail 53 and the upper sliding block 541, two ends of the second scissor lever 56 are respectively hinged with the front end of the upper guide rail 54 and the lower sliding block 531, and the middle parts of the first scissor lever 55 and the second scissor lever 56 are mutually hinged; one ends of the crank member 57 and the link member 58 are hinged to each other, and the other ends of the crank member 57 and the link member 58 are hinged to the front end of the upper rail 54 and the upper slider 541, respectively.

The adjustment assembly 50 has a foldable feature, and when the user is in a sitting position, the adjustment assembly 50 is in a folded state and hidden inside the chassis 10, and the first scissor lever 55, the second scissor lever 56, the crank member 57 and the link member 58 are folded to a horizontal state.

The upper base plate 11 has an escape hole 111 for the adjustment assembly 50 to pass through. When the auxiliary standing action is performed, the motor 51 drives the lower slider 531 to move forward through the lead screw transmission mechanism 52, so that the first scissor rod 55 and the second scissor rod 56 are unfolded upward through the avoidance hole 111, and the upper guide rail 53 is driven to rise upward; at the same time, the upper block 541 moves forward on the upper rail 54 in synchronization, so that the crank member 57 and the link member 58 are unfolded upward, and the crank member 57 is correspondingly inclined. Thus, the cushion plate 21 fixedly connected to the crank member 57 is moved from the horizontal posture to the inclined posture with the rear end thereof directed upward while being moved upward, and the user can be assisted in standing. Therefore, the adjusting assembly 50 is configured to simultaneously drive the cushion plate 21 to move up and down and adjust the tilt angle by the same motor 51, and has the advantages of simple structure and small occupied space.

As shown in fig. 2 and 4, the left side arm rest portion 25 constitutes a folding stick detachably attached to the seat plate 21, i.e., the left side arm rest portion 25 can be detached from the seat plate 21 and unfolded to be put to practical use as a stick, thereby providing more convenience to the user. Specifically, as shown in fig. 4, the left armrest portion 25 of the foldable cane includes a cane handle 251 and a cane rod, the cane rod includes an upper rod body 2521, a middle rod body 2522 and a lower rod body 2523, which are connected in sequence, and the upper rod body 2521 is integrally formed with or fixedly connected to the cane handle 251. A movable sleeve 254 is provided on the upper and

lower rods

2521 and 2523, and the movable sleeve 254 is fixed to an end of the middle rod 2522. The middle rod body 2522 is provided with a handrail plate 253, the left and right sides of the handrail plate 253 are provided with connecting ribs 2531, the middle rod body 2522 is arranged between the connecting ribs 2531 on the left and right sides, and the connecting ribs 2531 can be provided with screws for fixing the connecting ribs 2522 to the middle rod body. The middle rod 2522 may have a fixed length or may be a telescopic rod with an adjustable length.

Both ends of the middle rod 2522 are hinged to the upper rod 2521 and the lower rod 2523, respectively, and have the same hinge structure as the upper rod 2521 and the lower rod 2523. Here, the hinge structure of the upper rod 2521 and the middle rod 2522 will be described. As shown in fig. 5, two plate-shaped hinges 254 are provided at the end of the middle rod 2522, and a hinge shaft 2541 is provided on the hinge 254; the upper rod body 2521 is provided with a pair of hinge side plates 255, the hinge side plates 255 are provided with waist-shaped hinge holes 2551, the hinge head 254 is arranged between the pair of hinge side plates 255, and the hinge shaft 2541 is rotatably arranged in the waist-shaped hinge hole 2551.

When used as an armrest portion, as shown in fig. 4, the lower end of the lower rod 2523 is fixed to the side of the seat plate 21 by a thumb screw 255, the pole handle 251 is positioned in a U-shaped stopper groove 211 formed in the side of the seat plate 21, and the armrest plate 253 is positioned above the middle rod 253. It will be readily appreciated that other detachable connections, such as a detachable snap-fit connection or a plug-in connection, may be used for the lower rod 2523 and the cushion plate 21.

When the walking stick is used, firstly, the hand screw 255 is loosened, the left side armrest part 24 is detached from the cushion plate 21, then the middle rod 2522, the upper rod 2521 and the lower rod 2523 are unfolded, after the walking stick is unfolded to be in a straight state, the hinged joints 254 at the two ends of the middle rod 2522 can be respectively inserted into the upper rod 2521 and the lower rod 2523, at this time, the middle rod 2522, the upper rod 2521 and the lower rod 2523 are not foldable, and finally, the movable sleeve 254 is fixed at the tail end of the middle rod 2522, so that the middle rod 2522, the upper rod 2521 and the lower rod 2523 are relatively fixed in the length direction, namely, the left side armrest part 24 can be changed to be used as the walking stick shown in fig. 6. Wherein the movable sleeve 254 may form a tight fit or a threaded connection with the distal end of the central shaft 2522.

With continued reference to fig. 1 and 2, two track assemblies 40 are disposed on opposite sides of the underside of the undercarriage 10. Specifically, as shown in fig. 7, the track assembly 40 includes a walking frame 41, a track 42, a track driving mechanism 43, a plurality of (e.g., 6 as shown) driven support wheels 44, and a side cover 45; a plurality of driven support wheels 44 rotatably provided at both left and right sides of the traveling frame 41 and engaged with an inner circumference of the crawler belt 42; side covers 45 are provided on both left and right sides of the traveling frame 41, and cover the track driving mechanism 43 and the driven support wheels 44. Two hinge shafts 413 are further provided at the left and right sides of the traveling frame 41, respectively, and the hinge shafts 413 protrude to the outside of the side cover 45.

Both longitudinal ends of the traveling frame 41 are provided with crawler driving mechanisms 43. The crawler driving mechanism 43 comprises a motor 431, two driving wheels 432 and a transmission gear 433, the transmission gear 433 is arranged on a power output shaft of the motor 431, the two driving wheels 432 are arranged on the same rotating shaft and are located on the left side and the right side of the walking frame 41, the transmission gear 433 is meshed with one of the driving wheels 432, the motor 431 drives the two driving wheels 432 to rotate through the transmission gear 433 when working, and then the crawler 42 is driven to rotate by the driving wheels 432. The motors 431 of the two track driving mechanisms 43 may be respectively located at the left and right sides of the traveling frame 41.

A plurality of support protrusions 411 are formed on the upper and lower surfaces of the traveling frame 41 and distributed along the longitudinal direction thereof, balls 412 are provided at the ends of the support protrusions 411, a circular sliding groove 421 is formed at the inner center of the crawler 42 along the circumferential direction thereof, and the balls 412 are in contact with the bottom surface of the sliding groove 421. The support protrusions 411 may serve to support the track 42, reduce the pressure of the track 42 on the driven support wheels 44, and make the rotation of the track 42 smoother. The ball 412 is provided at the end of the support protrusion 411, and the ball 412 is in rolling contact with the bottom surface of the slide groove 421, which is advantageous for reducing the rotation resistance of the crawler belt 42.

A track pitch mechanism is provided between the undercarriage 10 and the track assembly 40 for adjusting the pitch angle of the track when ascending or descending stairs. As shown in fig. 1 and 2, the track inclination angle adjusting mechanism includes a front electric push rod 61 and a rear electric push rod 62 which are provided between the traveling frame 41 and the lower plate 12, one end of the front electric push rod 61 and the rear electric push rod 62 is hinged with a hinge 413 on the traveling frame 41, the other end is connected with the lower plate 12, and the inclination angle of the track 42 is controlled by adjusting the lengths of the front electric push rod 61 and the rear electric push rod 62. Preferably, two front electric push rods 61 and two rear electric push rods 62 are arranged between the walking frame 41 and the lower base plate 12, and the two front electric push rods 61 and the two rear electric push rods 62 are respectively arranged at the left and right sides of the walking frame 41.

As shown in fig. 1 and 2, the roller assembly 30 includes two front rollers 31 and two rear rollers 32, the front rollers 31 may be universal wheels, and the rear rollers 32 may be motorized wheels. Wherein two front rollers 31 and two rear rollers 32 are mounted on respective support legs 33. The support legs 33 are formed in a hollow structure, and the support legs 33 are hinged to the support rods 13 to be capable of swinging back and forth. The swing mechanism of the front roller 31 and the rear roller 32 is the same, and the swing structure of the front roller 31 will be described as an example. As shown in fig. 8 and 9, an electric push rod 34 is provided in the support rod 13, a lower end of the electric push rod 34 is connected to a central rod 35, and the electric push rod 34 can push the central rod 35 to move between an extended position extending into the support leg 33 and a retracted position retreating from the support leg 33.

In the walking state on the flat ground, the central rod 35 is pushed by the electric push rod 34 to extend downward into the supporting leg 33, so that the supporting leg 33 is prevented from swinging back and forth, and stable walking is realized. In the stair climbing state, as will be described in detail later, the electric push rod 34 pulls the central rod 35 upward, so that the central rod 35 is withdrawn from the supporting leg 33, and the supporting leg 33 can swing forward or backward, so that the crawler 42 can contact the stair. After going up and down the stairs, the supporting legs 33 can be reset by gravity and also by the acting force of the reset spring.

Figure 10 shows a wheelchair embodiment of the present invention in a situation when ascending stairs. As shown in fig. 10, when going upstairs, the caterpillar 42 is adjusted to a corresponding upward inclination angle by controlling the length of the front electric push rod 61 and/or the rear electric push rod 62, the electric push rod 34 pulls the central rod 35 to exit the supporting leg 33, the front roller 31 swings backward above the caterpillar 42 when contacting the stairs, the rear roller 32 is located above the caterpillar 42 or swings backward above the caterpillar 42 while abutting against the stairs, and neither the front roller 31 nor the rear roller 32 interferes with the stairs, so that the caterpillar 42 can smoothly perform a stair climbing action.

Figure 11 shows the wheelchair embodiment of the present invention in a position for descending stairs. When going down stairs, as shown in fig. 11, the electric push rod 34 pulls the central rod 35 to exit the supporting leg 33 by controlling the length of the front electric push rod 61 and/or the rear electric push rod 62 to adjust the crawler belt 42 to a corresponding declined angle. In this process, the rear roller 32 will swing backwards when contacting the stairs, but still partially extend below the track 42, such that the rear roller 32 can contact the stairs and cause the wheelchair to experience a certain downward resistance, making the process of descending stairs more gradual and safer. In addition, during the descent, the front end of the crawler 42 moves downward below the front roller 31, or the front roller 31 abuts against the stairs and swings backward above the crawler 42 without interfering with the stairs.

Although the present invention has been described in terms of the foregoing examples, it should be understood that the above examples are intended to illustrate and not limit the scope of the invention, which is intended to be covered by the claims of the present invention.

Claims

1. A multi-function wheelchair comprising:

the base frame comprises an upper base plate and a lower base plate, and four corners of the upper base plate and four corners of the lower base plate are connected through hollow support rods; wherein a battery is arranged between the upper bottom plate and the lower bottom plate;

the seat back assembly comprises a seat cushion plate, armrest parts arranged on the left side and the right side of the seat cushion plate and a backrest arranged on the rear side of the seat cushion plate; the seat cushion plate is movably supported on the upper bottom plate, the backrest is hinged with the seat cushion plate, and an angle adjusting mechanism for adjusting an included angle between the seat cushion plate and the backrest is arranged between the seat cushion plate and the backrest;

the two adjusting components are respectively arranged at the left side and the right side of the underframe and are used for adjusting the height and the inclination angle of the cushion plate; the adjusting assembly comprises a motor, a lead screw transmission mechanism, a lower guide rail provided with a lower sliding block, an upper guide rail provided with an upper sliding block, a first scissor rod, a second scissor rod, a crank component and a connecting rod component; the crank member is fixedly connected with the cushion plate, the lower guide rail is installed on the lower bottom plate, and the motor drives the lower sliding block to move on the lower guide rail through the lead screw transmission mechanism; two ends of the first scissor rod are hinged with the front end of the lower guide rail and the upper sliding block respectively, two ends of the second scissor rod are hinged with the front end of the upper guide rail and the lower sliding block respectively, and the middle parts of the first scissor rod and the second scissor rod are hinged with each other; one ends of the crank member and the connecting rod member are hinged with each other, and the other ends of the crank member and the connecting rod member are respectively hinged with the front end of the upper guide rail and the upper sliding block;

the roller assembly comprises two front rollers and two rear rollers, the two front rollers and the two rear rollers are mounted on corresponding supporting legs, the supporting legs form a hollow structure, and the supporting legs are hinged with the supporting rods and can swing back and forth; the support rod is internally provided with a first electric push rod, the lower end of the first electric push rod is connected with a central rod, and the first electric push rod can push the central rod to move between an extending position extending into the support leg and a retracting position retreating from the support leg;

the two crawler assemblies are respectively arranged on two sides below the underframe; the track assembly comprises a walking frame, a track driving mechanism, a plurality of driven supporting wheels and a side cover; the crawler driving mechanism is arranged at the longitudinal tail end of the walking frame and comprises a driving wheel meshed with the crawler and a motor driving the driving wheel to rotate; the driven supporting wheels are rotatably arranged at the left side and the right side of the walking frame and are meshed with the crawler belt; the side covers are arranged on the left side and the right side of the walking frame and cover the crawler driving mechanism and the driven supporting wheels;

the track inclination angle adjusting mechanism comprises a front electric push rod and a rear electric push rod which are arranged between the walking frame and the lower bottom plate, one end of the front electric push rod and one end of the rear electric push rod are hinged with the walking frame, the other end of the front electric push rod and the other end of the rear electric push rod are connected with the lower bottom plate, and the inclination angle of the track is controlled by adjusting the lengths of the front electric push rod and the rear electric push rod.

2. The multifunctional wheelchair according to claim 1, wherein the angle adjusting mechanism comprises a second electric push rod mounted on a lower surface of the cushion plate, and a driven connecting rod having one end hinged to the second electric push rod and the other end connected to the backrest.

3. The multifunctional wheelchair of claim 1, wherein the left or right armrest portion constitutes a foldable cane detachably connected to the seat plate, the foldable cane comprises a cane handle and a cane rod, the cane rod comprises an upper rod body, a middle rod body and a lower rod body which are connected in sequence, and two ends of the middle rod body are respectively hinged to the upper rod body and the lower rod body; and the middle rod body is provided with a handrail plate.

4. The multifunctional wheelchair of claim 3, wherein the middle rod body is provided with a hinge joint at both ends thereof, and a hinge shaft is provided on the hinge joint; the upper rod body and the lower rod body are respectively provided with a pair of hinged side plates, waist-shaped hinged holes are formed in the hinged side plates, the hinged joint is arranged between the hinged side plates, and the hinged shaft is rotatably arranged in the waist-shaped hinged holes; the upper rod body and the lower rod body are provided with movable sleeves, and the movable sleeves can be fixed to the tail ends of the middle rod bodies.

5. The multifunctional wheelchair of claim 3, wherein the bottom end of the lower rod is fixed to the side of the seat plate by a thumb screw, and the cane handle is positioned in a U-shaped limit groove in the side of the seat plate.

6. The multifunctional wheelchair according to claim 1, wherein two front electric push rods and two rear electric push rods are provided between the traveling frame and the lower plate, and the two front electric push rods and the two rear electric push rods are respectively provided on left and right sides of the traveling frame.

7. The multifunctional wheelchair according to claim 1, wherein the upper and lower surfaces of the walking frame are formed with a plurality of supporting protrusions distributed along a length direction thereof, ends of the supporting protrusions being provided with balls; the inner center of the crawler belt is provided with a circle of sliding grooves along the circumferential direction, and the balls are abutted to the bottom surfaces of the sliding grooves.

8. A multi-function wheelchair in accordance with claim 1, wherein both longitudinal ends of the walking frame are provided with the track drive mechanism.

9. The multifunctional wheelchair of claim 1, further comprising two pedals and two pedal connecting rods arranged on the left and right, wherein the lower ends of the pedal connecting rods are fixedly connected with the pedals, and the upper ends of the pedal connecting rods are hinged with the seat cushion plate.

10. The multifunctional wheelchair according to claim 1, wherein a headrest and two wheelchair handles are provided above the backrest, and the two wheelchair handles are respectively provided on left and right sides of the headrest.