Hand-operated wheelchair bicycle

Abstract

The utility model provides a hand-operated wheelchair bicycle, which relates to the technical field of wheelchairs and aims to solve the problems that in the prior art, a wheelchair is driven by rotation of a hand wheel, force is not easy to apply, and the operation is inconvenient, the hand-operated wheelchair bicycle comprises a wheelchair frame, two hand-operated rods and two driving wheels, the two driving wheels are installed on the left side and the right side of the wheelchair frame respectively, the two hand cranks correspond to the upper portions of the driving wheels respectively and are rotationally connected to the wheelchair frame, and the two hand cranks are in transmission connection with the driving wheels through transmission mechanisms respectively. According to the hand-operated wheelchair bicycle, a force exerting supporting point at a proper position is provided for a user, so that the hand-operated rod is arranged at a proper position, the hand-operated wheelchair bicycle conforms to human mechanics, and the user can operate the hand-operated wheelchair bicycle more comfortably in a more labor-saving manner.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a hand-cranked wheelchair bicycle. Background Art

[0002] At present, manual wheelchairs sold on the market generally push the wheelchair forward by turning the wheel rims on both sides forward, and when the operator turns the hand rings backward, the wheelchair moves backward.

[0003] For example, a manual liftable wheelchair disclosed in the patent application document with application number 201510058124.X is driven by turning the hand wheels on both sides by hand. This driving method is to directly shake the wheel axle to realize the forward or backward movement of the wheelchair, so the operator needs to have greater arm strength and waist coordination to operate normally, which is not suitable for some disabled people or elderly people with weak arms and waists. In addition, since the hand ring is set at the lower back of the operator, the operator's arms and waist will feel uncomfortable if the hand ring is pushed for a long time, which is not suitable for long-term operation, and the rotation of the hand ring is intermittent motion, which is inconvenient to operate. Utility Model Content

[0004] The purpose of the utility model is to provide a hand-cranked wheelchair bicycle to solve the problem in the prior art that it is difficult to apply force and inconvenient to operate a wheelchair by rotating a hand wheel. The hand-cranked wheelchair bicycle of the utility model provides a force support point at a suitable position for the user, so that the hand crank is set at a suitable position, which conforms to human mechanics and is more comfortable and labor-saving for the user to operate.

[0005] The utility model provides a hand-cranked wheelchair bicycle, comprising a wheelchair frame, two hand-cranked levers and two driving wheels, wherein the two driving wheels are respectively mounted on the left and right sides of the wheelchair frame, the two hand-cranked levers respectively correspond to the top of the driving wheels and are rotatably connected to the wheelchair frame, and the two hand-cranked levers are respectively connected to the driving wheels through a transmission mechanism.

[0006] As a preferred solution of the utility model, the transmission mechanism includes an upper transmission wheel, a chain and a lower transmission wheel, the upper transmission wheel is coaxially connected to the rotating shaft of the hand crank, the lower transmission wheel is coaxially connected to the driving wheel through a connecting shaft, and the chain is wound between the upper transmission wheel and the lower transmission wheel.

[0007] As a preferred solution of the utility model, the upper transmission wheel is connected to the rotating shaft at its center via a ratchet mechanism, or the lower transmission wheel is connected to the connecting shaft at its center via a ratchet mechanism.

[0008] As a preferred solution of the present utility model, the diameter of the upper transmission wheel is greater than the diameter of the lower transmission wheel.

[0009] As a preferred solution of the utility model, the wheelchair frame includes a base frame, an upper frame and two connecting rods, the upper frame is arranged parallel to the top of the base frame, and the two connecting rods are vertically connected to the rear ends of the base frame and the upper frame on the left and right sides respectively.

[0010] As a preferred solution of the utility model, the driving wheel and the hand crank are respectively mounted on the upper and lower ends of the connecting support rod and are located on the outside of the wheelchair frame, and the transmission mechanism is arranged vertically along the connecting support rod and is located on the inside of the wheelchair frame.

[0011] As a preferred embodiment of the present invention, it further includes a brake assembly, which includes a brake handle, a brake line and a brake. The brake handle is correspondingly installed on the lower side of the hand crank, and the brake is installed on the wheelchair frame near the outer edge of the driving wheel. The brake handle is connected to the brake through the brake line.

[0012] As a preferred solution of the utility model, it also includes a front wheel, and the front wheel is installed below the front end of the wheelchair frame through a front wheel frame.

[0013] Compared with the prior art, the utility model has the following positive effects:

[0014] The hand-cranked wheelchair bicycle provided by the utility model comprises a wheelchair frame, two hand-cranked levers and two driving wheels, wherein the two driving wheels are respectively mounted on the left and right sides of the wheelchair frame, and the two hand-cranked levers are respectively corresponding to the driving wheels and are rotatably connected to the wheelchair frame, and the two hand-cranked levers are respectively connected to the driving wheels through a transmission mechanism. The hand-cranked wheelchair bicycle in the utility model is arranged on the wheelchair frame above the driving wheels, so that when a person sits on the wheelchair, it is easier to turn the hand-cranked lever by hand, and the driving wheels are driven to rotate by the hand-cranked lever, providing the user with a force support point at a suitable position, so that the hand-cranked lever is arranged at a suitable position, which conforms to human mechanics, and is more comfortable and labor-saving for the user to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a structural schematic diagram of the hand-cranked wheelchair bicycle of the utility model from the first perspective;

[0017] Figure 2 This is a structural schematic diagram of the hand-cranked wheelchair bicycle of the utility model from a second viewing angle;

[0018] Figure 3 It is a plan view of the ratchet mechanism in the hand-cranked wheelchair bicycle of the utility model.

[0019] In the figure: 1, wheelchair frame; 11, bottom frame; 12, upper frame; 13, connecting rod; 2, driving wheel; 3, hand crank; 4, transmission mechanism; 41, upper transmission wheel; 42, chain; 43, lower transmission wheel; 441, ratchet; 442, mounting plate; 443, pawl; 45, connecting shaft; 46, rotating shaft; 5, brake assembly; 51, brake handle; 52, brake line; 53, brake; 6, front wheel; 61, front wheel frame. DETAILED DESCRIPTION

[0020] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "back end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1:

[0024] This embodiment provides a hand-cranked wheelchair bicycle, such as Figure 1-Figure 2 As shown, the wheelchair comprises a wheelchair frame 1, two hand cranks 3 and two driving wheels 2. The driving wheels 2 are used to drive the wheelchair. The wheelchair frame 1 is the main frame of the wheelchair, and provides support and connection for the hand cranks 3, the driving wheels 2, the seat and other components.

[0025] The two driving wheels 2 are respectively mounted on the left and right sides of the wheelchair frame 1, and the two hand cranks 3 correspond to the tops of the driving wheels 2 and are rotatably connected to the wheelchair frame 1. The two hand cranks 3 are respectively connected to the driving wheels 2 through transmission mechanisms 4. When the hand cranks 3 are rotated, the driving wheels 2 on the corresponding side are driven to rotate through the transmission mechanism 4.

[0026] The operator shakes the hand joysticks with both hands at the same time, and the wheelchair moves forward; when only the left hand joystick is shaken, the wheelchair turns right; when only the right hand joystick is shaken, the wheelchair turns left.

[0027] The hand-cranked wheelchair bicycle in this embodiment is configured such that the hand crank 3 is correspondingly arranged on the wheelchair frame 1 above the driving wheel 2, so that when a person sits on the wheelchair, it is easier for the hand to turn the hand crank, thereby driving the driving wheel 2 to rotate. This provides the user with a force support point at a suitable position, and enables the hand crank to be arranged at a suitable position, which is in line with human mechanics and is more comfortable and labor-saving for the user to operate.

[0028] As a preferred embodiment, the transmission mechanism 4 includes an upper transmission wheel 41, a chain 42 and a lower transmission wheel 43. The upper transmission wheel 41 is coaxially connected to the rotating shaft 46 of the hand crank 3, and the upper transmission wheel 41 rotates synchronously with the hand crank 3. The lower transmission wheel 43 is coaxially connected to the driving wheel 2 through a connecting shaft 45, and the lower transmission wheel 43 can rotate synchronously with the driving wheel 2. The chain 42 is wound between the upper transmission wheel 41 and the lower transmission wheel 43.

[0029] When the hand crank 3 is rotated, the upper transmission wheel 41 is driven to rotate, and the upper transmission wheel 41 drives the lower transmission wheel 43 to rotate through the chain 42, thereby driving the driving wheel 2 to rotate.

[0030] As a preferred embodiment, the diameter of the upper transmission wheel 41 is greater than the diameter of the lower transmission wheel 43, so that when the upper transmission wheel rotates the same number of times, the number of rotations of the lower transmission wheel 43 increases, making it easier to save effort when the hand crank 3 drives the drive wheel 2 to rotate.

[0031] As a preferred embodiment, the upper transmission wheel 41 is connected to the rotating shaft 46 at its center through a ratchet mechanism, or the lower transmission wheel 43 is connected to the connecting shaft 45 at its center through a ratchet mechanism.

[0032] In this embodiment, a ratchet mechanism is provided so that when the hand crank is pressed downward, the upper transmission wheel 41 connected to the hand crank rotates, driving the chain connected thereto, thereby driving the lower transmission wheel 43 connected to the chain, and driving the driving wheel 2 to rotate; when the hand crank is lifted up and reset, the ratchet mechanism idles, and the driving wheel 2 is not driven, and this process is repeated, which is convenient and labor-saving.

[0033] When the ratchet mechanism is disposed in the upper transmission wheel 41, when the ratchet mechanism is idle, the hand crank cannot drive the upper transmission wheel 41 to rotate. When the ratchet mechanism is disposed in the lower transmission wheel 43, when the ratchet mechanism is idle, the lower transmission wheel 43 cannot drive the driving wheel 2 to rotate.

[0034] It should be noted that the hand crank can drive the upper transmission wheel 41 to rotate when the hand crank is pressed down, and the ratchet mechanism idles when the hand crank is lifted; or the hand crank can drive the upper transmission wheel 41 to rotate when the hand crank is lifted, and the ratchet mechanism idles when the hand crank is pressed down.

[0035] Specifically, Figure 3 As shown, the ratchet mechanism includes a ratchet 441, a mounting plate 442 and a pawl 443. The mounting plate 442 is fixedly mounted on the rotating shaft 46 or the connecting shaft 45. The pawl 443 is connected to the peripheral side of the mounting plate 442 through an elastic member. The ratchet 441 is fixedly connected to the inner side of the upper transmission wheel 41 or the lower transmission wheel 43. Taking the upper transmission wheel 41 as an example, when the upper transmission wheel 41 rotates clockwise, the upper transmission wheel 41 rotates clockwise synchronously with the ratchet 441. When the ratchet 441 moves the pawl 443, the pawl 443 compresses the spring and shrinks. At this time, the upper transmission wheel 41 cannot drive the mounting plate 442 to rotate; when the upper transmission wheel 41 rotates counterclockwise, the upper transmission wheel 41 rotates counterclockwise synchronously with the ratchet 441, and the pawl 443 is stuck on the ratchet 441. At this time, the upper transmission wheel 41 drives the mounting plate 442 to rotate, thereby driving the inner rotating shaft 46 to rotate. The ratchet mechanism is an existing structure commonly used on bicycles.

[0036] As a preferred implementation mode, Figure 1 and Figure 2 As shown, the wheelchair frame 1 includes a bottom frame 11, an upper frame 12 and two connecting rods 13. The upper frame 12 is arranged above the bottom frame 11 in parallel, and the two connecting rods 13 are vertically connected to the rear ends of the bottom frame 11 and the upper frame 12 on the left and right sides respectively. The connecting rods 13 play a supporting and connecting role for the bottom frame 11 and the upper frame 12.

[0037] The bottom frame 11 and the upper frame 12 are extended forward relative to the connecting rod 13. The bottom frame 11 and the upper frame 12 are both rectangular frame structures, and the length of the bottom frame 11 extending forward is greater than the length of the upper frame 12 extending forward, and the width of the bottom frame 11 and the upper frame 12 are equal.

[0038] The seat is mounted on the upper frame 12 and is arranged toward the extension direction of the bottom frame 11 relative to the driving wheel 2. The hand crank is rotatably mounted on the left and right sides of the seat, the tail end of the hand crank is a hand grip and the head end is connected to the upper transmission wheel 41 through a rotating shaft 46. The operator sits on the seat and drives the driving wheel 2 to rotate by swinging the hand grip of the hand crank. The length of the hand crank is adjusted according to the use requirements, and the hand crank can be a telescopic rod to facilitate the adjustment of the length.

[0039] As a preferred embodiment, the driving wheel 2 and the hand crank 3 are respectively mounted on the upper and lower ends of the connecting rod 13 and are located on the outside of the wheelchair frame 1. The transmission mechanism 4 is arranged vertically along the connecting rod 13 and is located on the inside of the wheelchair frame 1 to reduce external interference and make full use of the internal space of the wheelchair frame 1.

[0040] Specifically, the upper transmission wheel 41 is rotatably mounted on the upper end of the connecting rod 13 , the lower transmission wheel 43 is rotatably mounted on the lower end of the connecting rod 13 , and the chain 42 is vertically wound around the upper transmission wheel 41 and the lower transmission wheel 43 .

[0041] As a preferred embodiment, the hand-cranked wheelchair bicycle of this embodiment further includes a brake assembly 5, which includes a brake handle 51, a brake line 52 and a brake 53. The brake handle 51 is correspondingly mounted on the lower side of the hand crank 3, and the brake 53 is mounted on the wheelchair frame 1 near the outer edge of the driving wheel 2. The brake handle 51 is connected to the brake 53 through the brake line 52. The brake 53 is mounted on the bottom frame 11.

[0042] A brake handle 51 is provided at each of the hand cranks on the left and right sides, and the brake handle 51 is connected to a brake 53 through a brake line 52. When the wheelchair is moving forward, the operator brakes by pressing the brake handles 51 on both sides at the same time. When the wheelchair is turning, the wheelchair can turn left by pressing the left brake handle, and turn right by pressing the right brake handle. The brake 53 structure is the existing technology.

[0043] When the wheelchair is going uphill, the wheelchair can be prevented from rolling backward. The specific operation is as follows: when the hand crank is pressed downward to apply force to the driving wheel, the wheelchair is in a driving state. When the process is completed and the hand crank is lifted upward, the hand crank does not apply force to the driving wheel and is in a relaxed state. The wheelchair will roll backward. At this time, the brake handle 51 can be pressed to brake the wheelchair to prevent the wheelchair from rolling backward. When the hand crank is lifted upward and then pressed downward, the brake is released and the wheelchair continues to move forward. This is repeated.

[0044] As a preferred embodiment, the hand-cranked wheelchair bicycle of this embodiment further includes a front wheel 6, which is mounted below the front end of the wheelchair frame 1 through a front wheel frame 61. Two driving wheels 2 are mounted on the rear side of the wheelchair frame 1. The front wheel 6 can be a universal wheel. The diameter of the front wheel 6 is smaller than the diameter of the driving wheel 2 to facilitate turning.

[0045] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A hand-cranked wheelchair bicycle, characterized in that: The wheelchair comprises a wheelchair frame (1), two hand cranks (3) and two driving wheels (2), wherein the two driving wheels (2) are respectively mounted on the left and right sides of the wheelchair frame (1), the two hand cranks (3) respectively correspond to the top of the driving wheels (2) and are rotatably connected to the wheelchair frame (1), and the two hand cranks (3) are respectively connected to the driving wheels (2) through a transmission mechanism (4).

2. A hand-cranked wheelchair bicycle according to claim 1, characterized in that: The transmission mechanism (4) comprises an upper transmission wheel (41), a chain (42) and a lower transmission wheel (43); the upper transmission wheel (41) is coaxially connected to the rotating shaft of the hand crank (3); the lower transmission wheel (43) is coaxially connected to the driving wheel (2) via a connecting shaft (45); and the chain (42) is wound between the upper transmission wheel (41) and the lower transmission wheel (43).

3. A hand-cranked wheelchair bicycle according to claim 2, characterized in that: The upper transmission wheel (41) is connected to the rotating shaft (46) at its center via a ratchet mechanism, or the lower transmission wheel (43) is connected to the connecting shaft (45) at its center via a ratchet mechanism.

4. A hand-cranked wheelchair bicycle according to claim 1, characterized in that: The wheelchair frame (1) comprises a bottom frame (11), an upper frame (12) and two connecting rods (13); the upper frame (12) is arranged parallel to the top of the bottom frame (11); and the two connecting rods (13) are vertically connected to the rear ends of the bottom frame (11) and the upper frame (12) on the left and right sides respectively.

5. A hand-cranked wheelchair bicycle according to claim 4, characterized in that: The driving wheel (2) and the hand crank (3) are respectively mounted on the upper end and the lower end of the connecting support rod (13) and are located on the outside of the wheelchair frame (1); the transmission mechanism (4) is arranged vertically along the connecting support rod (13) and is located on the inside of the wheelchair frame (1).

6. A hand-cranked wheelchair bicycle according to claim 1, characterized in that: The wheelchair further comprises a brake assembly (5), wherein the brake assembly (5) comprises a brake handle (51), a brake line (52) and a brake (53), wherein the brake handle (51) is correspondingly mounted on the lower side of the hand crank (3), and the brake (53) is mounted on the wheelchair frame (1) near the outer edge of the driving wheel (2), and the brake handle (51) is connected to the brake (53) via the brake line (52).

7. A hand-cranked wheelchair bicycle according to claim 4, characterized in that: It also comprises a front wheel (6), wherein the front wheel (6) is mounted below the front end of the wheelchair frame (1) via a front wheel frame (61).

8. A hand-cranked wheelchair bicycle according to claim 2, characterized in that: The diameter of the upper transmission wheel (41) is greater than the diameter of the lower transmission wheel (43).

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