Angle-adjustable wheelchair tractor

Abstract

An angle-adjustable wheelchair tractor comprises a lower frame (7) and an upper frame (8) which are hingedly connected, the lower frame (7) being a shock-absorbing frame, the lower frame (7) being respectively provided with a wheel hub motor (2) and a battery (3) for providing electric energy to the wheel hub motor (2), the upper frame (8) being provided with a pair of handles (4) for controlling the direction of the wheel hub, a brake disc (5) being provided on one side of the wheel hub motor (2), a brake handle (6) for controlling the brake disc (5) being respectively provided on the pair of handles (4), a connecting sleeve (10) being provided on the lower frame (7), and a front support frame (11) and a front connection device (12) connected to a front support rod of the wheelchair being respectively provided on the connecting sleeve (10). The utility model has the advantages that the tractor and the wheelchair are connected in a split type, the installation and use are convenient and flexible, and it is convenient for traveling alone over long distances, the frame is provided with a shock absorber and the inclination angle of the upper part thereof is adjustable, which can greatly improve the driving comfort.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchair auxiliary equipment, in particular to a wheelchair tractor with adjustable angle. Background Art

[0002] Hand-pushed wheelchairs have been widely used as a means of transportation for the sick, disabled, old and weak, but the range of movement of users is limited and they cannot travel long distances. The use environment of integrated electric wheelchairs is limited and they are not flexible enough. The frame of existing wheelchair tractors is fixedly connected, which causes large vibrations during driving and poor comfort. At the same time, the tilt angle of the frame is fixed, and the position of the handle can only be adjusted up and down through the frame, but the tilt angle cannot be adjusted, which affects the use effect. Utility Model Content

[0003] The purpose of the utility model is to provide an angle-adjustable wheelchair tractor to overcome the above-mentioned deficiencies.

[0004] The utility model comprises a lower frame and an upper frame which are hinged to each other. The lower frame is a shock-absorbing frame, and a wheel hub motor and a battery for providing electric energy to the wheel hub motor are respectively arranged on the lower frame. A pair of handles for controlling the direction of the wheel hub are arranged on the upper frame. A brake disc is arranged on one side of the wheel hub motor, and a brake handle for controlling the brake disc is respectively arranged on the pair of handles. A connecting sleeve is arranged on the lower frame, and a vehicle head supporting frame and a vehicle head connecting device connected with a front supporting rod of the wheelchair are respectively arranged on the connecting sleeve.

[0005] The lower frame is a fork-shaped frame, both ends of the fork-shaped frame are provided with hydraulic shock absorbers, and are connected to the wheel hub of the hub motor through the hydraulic shock absorbers. Angle adjustment plates are respectively provided on both sides of the top of the lower frame, and a group of positioning holes are provided on the angle adjustment plates. The upper frame is hinged to the lower frame through a pin shaft, and positioning pins matching the angle adjustment plates are respectively provided on both sides of the upper frame.

[0006] The front connection device includes an adjuster, one end of which is provided with a connecting sleeve that can be detachably mounted on a connecting sleeve, the other end of the adjuster is rotatably provided with a connecting shaft, both ends of the connecting shaft are symmetrically provided with connecting rods, the connecting rod and the connecting shaft are movably connected by a pin shaft, and the end of the connecting rod is provided with a connecting clamp that can be detachably mounted on a front support rod of the wheelchair; an adjusting gear is provided on the connecting shaft located in the adjuster, and a gear forward rotation locking plate, a gear rearward rotation locking plate and a locking screw for fixing the gear rearward rotation locking plate are respectively provided on the adjuster.

[0007] The gear forward rotation locking plate and the gear backward rotation locking plate are both provided with locking protrusions that cooperate with the adjusting gear. The gear forward rotation locking plate and the gear backward rotation locking plate are both movably installed on the adjuster through a pin shaft, and a torsion spring is provided at the connection between the gear forward rotation locking plate and the adjuster.

[0008] The connecting clamp is hingedly connected by a fixed clamp and a movable clamp, a locking handle is hingedly connected to one side of the fixed clamp, an adjustable locking plate is provided at the end of the locking handle, a locking hook is provided at one end of the adjustable locking plate, and a locking groove matching the locking hook is provided on the movable clamp;

[0009] A group of connecting screws are provided at the end of the locking handle, a group of connecting screw mounting holes are provided on the adjustable locking plate, the adjustable locking plate is installed on the group of connecting screws, and locking nuts are threaded on the connecting screws on both sides of the adjustable locking plate.

[0010] A connecting seat is detachably mounted on the connecting sleeve, and a locking and positioning slot is provided on the connecting seat. A plug-in block is provided on the vehicle head support frame, and the plug-in block is mounted in the locking and positioning slot and locked by a screw.

[0011] The front support frame is a U-shaped support frame, and both ends of the U-shaped support frame are respectively provided with anti-slip pads.

[0012] The brake lever is adjustably mounted on the handle, the handle is provided with a fixed toothed ring, the brake lever is provided with a connecting ring used in conjunction with the fixed toothed ring, the connecting ring is provided with a pair of locking rods in opposite directions for locking in conjunction with the fixed toothed ring, and the locking rods are movably mounted on the connecting ring through a spring.

[0013] The utility model has the advantages that the tractor and the wheelchair are connected in a split type, which is convenient and flexible to install and use, and is convenient for traveling long distances alone. The frame is provided with a shock absorber and the inclination angle of the upper part thereof is adjustable, which can greatly improve the driving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the structure of the vehicle head connection device.

[0016] Figure 3 It is a schematic diagram of the regulator structure.

[0017] Figure 4 It is a schematic diagram of the connecting clamp structure.

[0018] Figure 5 It is a schematic diagram of the structure of the front support frame.

[0019] Figure 6 It is a schematic diagram of the brake handle connection structure. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, 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, if the terms "first", "second", etc. appear in the description of the present utility model, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] As shown in the accompanying drawings, the utility model includes a lower frame 7 and an upper frame 8 which are hinged to each other. The lower frame 7 is a shock-absorbing frame. The lower frame 7 is respectively provided with a wheel hub motor 2 and a battery 3 for providing electrical energy to the wheel hub motor 2. The upper frame 8 is provided with a pair of handles 4 for controlling the direction of the wheel hub. A brake disc 5 is provided on one side of the wheel hub motor 2. The pair of handles 4 are respectively provided with brake handles 6 for controlling the brake disc 5. The lower frame 7 is provided with a connecting sleeve 10, and the connecting sleeve 10 is respectively provided with a front support frame 11 and a front connecting device 12 connected to the front support rod of the wheelchair.

[0025] A fender is provided on the lower frame 7, and a headlight electrically connected to the battery 3 is provided on the front top of the fender; a power switch and a throttle speed accelerator handle are provided on the right handle 4, and a headlight switch and a horn switch are provided on the left handle 4.

[0026] A connecting column is provided in the middle of the fork frame structure, and a connecting sleeve 10 is movably sleeved on the connecting column. When the entire frame rotates, the connecting sleeve 10 is relatively fixed. When the tractor is not connected to the wheelchair, the front support frame 11 can support the tractor.

[0027] In this case, two brake handles 6 simultaneously control one brake disc 5, which is convenient for different users. That is, two brake calipers are arranged on the brake disc 5, and the two brake calipers are respectively linked with the corresponding brake handles 6, one of which is a mechanical brake and the other is a hydraulic brake.

[0028] The battery 3 is detachably mounted on the shock-absorbing frame for easy replacement. The battery 3 is used to supply power to various electronic devices on the tractor.

[0029] Preferably, the lower frame 7 is a fork-shaped frame, both ends of the fork-shaped frame are provided with hydraulic shock absorbers 9, and are connected to the hub of the hub motor 2 through the hydraulic shock absorbers 9, angle adjustment plates 13 are provided on both sides of the top of the lower frame 7, and a group of positioning holes are provided on the angle adjustment plates 13, the upper frame 8 is hinged to the lower frame 7 through a pin shaft, and positioning pins matching the angle adjustment plates 13 are provided on both sides of the upper frame 8.

[0030] The hydraulic shock absorber 9 makes the tractor have a shock absorbing effect when traveling on uneven roads, reduces vibration and improves comfort. The angle adjustment plate 13 and the positioning pin cooperate to adjust the inclination angle of the upper frame 8.

[0031] Preferably, the front connecting device 12 includes an adjuster 15, one end of which is provided with a connecting sleeve 16 that can be detachably mounted on the connecting sleeve 10, and the other end of the adjuster 15 is rotatably provided with a connecting shaft 17, and the two ends of the connecting shaft 17 are symmetrically provided with connecting rods 18, and the connecting rod 18 is movably connected to the connecting shaft 17 through a pin shaft, and the end of the connecting rod 18 is provided with a connecting clamp 19 that can be detachably mounted on the front support rod of the wheelchair; an adjusting gear 30 is provided on the connecting shaft 17 located in the adjuster 15, and a gear forward rotation locking plate 23, a gear rearward rotation locking plate 24 and a locking screw 25 for fixing the gear rearward rotation locking plate 24 are respectively provided on the adjuster 15.

[0032] One side of the connecting sleeve 16 is open, and a pair of locking screws are provided on the open side, and the height of the connecting sleeve 16 connected to the connecting sleeve 10 can be adjusted according to installation requirements.

[0033] The two connecting rods 18 are distributed in a fork shape and are used to connect the front support rods of the wheelchair without affecting the placement of the user's legs.

[0034] The two connecting rods 18 can rotate with the connecting shaft 17. When in use, the tractor is in a backward tilted state. Therefore, before installation, the connecting rods 18 can be adjusted to form a larger angle with the shock-absorbing frame, and then the two connecting rods 18 can be fixed to the front support rod of the wheelchair through the connecting clamps 19. The connecting rods 18 maintain a vertical angle with the front support rod of the wheelchair. After completion, you only need to push the entire shock-absorbing frame forward to quickly adjust the inclination angle of the shock-absorbing frame. In this case, the adjuster 15 is similar to a locking mechanism of a ratchet pawl. The gear forward rotation locking plate 23 is used to limit the connection shaft 17 to rotate forward (i.e., counterclockwise in the figure), and the gear rearward rotation locking plate 24 is used to limit the connection shaft 17 to rotate backward (i.e., clockwise in the figure). The locking screw 25 is used to press the gear rearward rotation locking plate 24 to limit the rotation of the connection shaft 17 in the backward direction.

[0035] Specifically, the gear forward rotation locking plate 23 and the gear backward rotation locking plate 24 are both provided with locking protrusions that cooperate with the adjusting gear 30. The gear forward rotation locking plate 23 and the gear backward rotation locking plate 24 are both movably installed on the adjuster 15 through a pin shaft, and a torsion spring is provided at the connection between the gear forward rotation locking plate 23 and the adjuster 15.

[0036] That is, the gear forward rotation locking plate 23 automatically locks the adjusting gear 30 to rotate forward under the action of the torsion spring, and the gear backward rotation locking plate 24 needs to be pressed by the locking screw 25 to lock the adjusting gear 30 to rotate backward. Therefore, in actual use, the locking screw 25 is in a loose state during installation, that is, the gear backward rotation locking plate 24 does not contact the adjusting gear 30.

[0037] After the installation is completed, when the user pushes the upper part of the shock-absorbing frame forward, the connecting shaft 17 rotates clockwise. After loosening, the gear forward locking plate 23 automatically locks the connecting shaft 17 to prevent it from rotating counterclockwise. At this time, the locking screw 25 is rotated to press the gear backward locking plate 24 downward to tighten the adjusting gear 30, and the connecting shaft 17 is locked in the clockwise direction. The entire installation is completed, and the connecting shaft 17 cannot rotate in both directions to ensure its safety during driving.

[0038] In the present case, the middle part of the gear forward rotation locking plate 23 is hinged on the regulator 15, and both ends extend to the outside of the regulator 15. The upper and lower sides of the regulator 15 are provided with avoidance holes for the gear forward rotation locking plate 23. Under the default condition, the part of the gear forward rotation locking plate 23 extending to the outside is opposed to the corresponding side wall of the avoidance hole, that is, the avoidance hole also limits the counterclockwise rotation position of the gear forward rotation locking plate 23.

[0039] Preferably, the connecting clamp 19 is hingedly connected by a fixed clamp ring 31 and a movable clamp ring 32, a locking handle 33 is hingedly connected to one side of the fixed clamp ring 31, an adjustable locking plate 35 is provided at the end of the locking handle 33, a locking hook is provided at one end of the adjustable locking plate 35, and a locking groove matching the locking hook is provided on the movable clamp ring 32;

[0040] A group of connecting screws 37 are provided at the end of the locking handle 33, and a group of connecting screw mounting holes are provided on the adjustable locking plate 35. The adjustable locking plate 35 is installed on the group of connecting screws 37, and locking nuts 38 are threadedly connected to the connecting screws 37 on both sides of the adjustable locking plate 35.

[0041] Installation and disassembly are quick and convenient, and the connecting screw 37 and the locking nut 38 cooperate to adjust the size of the fixed snap ring 31 and the movable snap ring 32 according to the diameter of the wheelchair support rod.

[0042] During installation, anti-slip pads are provided inside the fixed snap ring 31 and the movable snap ring 32 .

[0043] Furthermore, a connecting seat 40 is detachably mounted on the connecting sleeve 10, and a locking and positioning slot is provided on the connecting seat 40. A plug-in block 41 is provided on the front support frame 11, and the plug-in block 41 is installed in the locking and positioning slot and locked by a screw.

[0044] The front support frame 11 is a U-shaped support frame, and anti-skid pads are respectively provided at both ends of the U-shaped support frame.

[0045] When parking, the front support frame 11 and the wheel hub are supported at three points, and the anti-skid pads can effectively prevent the tractor from slipping when parked on smooth ground indoors or outdoors.

[0046] The height of the front support frame 11 can be adjusted as required by adjusting the position of the connecting seat 40 on the connecting sleeve 10. By default, after the entire tractor is installed on the wheelchair, the front support frame 11 is not in contact with the ground, and the distance between the front support frame 11 and the ground should be maintained at not less than 100 mm to avoid the front support frame 11 from scraping the ground during use.

[0047] Furthermore, the brake handle 6 can be adjustably installed on the handle 4, and the handle 4 is provided with a fixed toothed ring 50. The brake handle 6 is provided with a connecting ring 51 for use with the fixed toothed ring 50. The connecting ring 51 is provided with a pair of locking rods 52 in the opposite direction for locking with the fixed toothed ring 50. The locking rods 52 are installed on the connecting ring 51 through spring movement.

[0048] The fixed toothed ring 50 is fixed to the handle 4, and the connecting ring 51 is sleeved on the fixed toothed ring 50, so that the direction can be adjusted by rotating on the fixed toothed ring 50. The adjustment method in this case is a ratchet pawl adjustment method, that is, the fixed toothed ring 50 is a fixed ratchet, and the two locking rods 52 are ratchets that cooperate with the ratchet. One locking rod 52 limits the connecting ring 51 to rotate clockwise, and the other locking rod 52 limits the connecting ring 51 to rotate counterclockwise. When adjustment is required, only one locking rod 52 needs to be pulled outward to rotate the connecting ring 51. After the adjustment is completed, the locking rod 52 can be released. At this time, the connecting ring 51 is fixed on the fixed toothed ring 50 and cannot be rotated, thereby completing the angle adjustment of the brake handle 6. For patients with disabled fingers, the direction of the brake handle 6 can be adjusted to upward, and the brake can be applied by pressing the brake handle 6 downward with the palm or forearm when in use.

Claims

1. An angle-adjustable wheelchair tractor, characterized in that The wheelchair comprises a lower frame (7) and an upper frame (8) which are hingedly connected to each other, the lower frame (7) being a shock-absorbing frame, the lower frame (7) being provided with a wheel hub motor (2) and a battery (3) for providing electric energy to the wheel hub motor (2), the upper frame (8) being provided with a pair of handles (4) for controlling the direction of the wheel hub, a brake disc (5) being provided on one side of the wheel hub motor (2), a brake lever (6) for controlling the brake disc (5) being provided on the pair of handles (4), the lower frame (7) being provided with a connecting sleeve (10), and a front support frame (11) and a front connection device (12) connected to a front support rod of the wheelchair being provided on the connecting sleeve (10).

2. The angle-adjustable wheelchair tractor according to claim 1, characterized in that The lower frame (7) is a fork-shaped frame, and both ends of the fork-shaped frame are provided with hydraulic shock absorbers (9), and are connected to the wheel hub of the wheel hub motor (2) through the hydraulic shock absorbers (9). Angle adjustment plates (13) are respectively provided on both sides of the top of the lower frame (7), and a group of positioning holes are provided on the angle adjustment plates (13). The upper frame (8) is hinged to the lower frame (7) through a pin shaft, and positioning pins matching the angle adjustment plates (13) are respectively provided on both sides of the upper frame (8).

3. The angle-adjustable wheelchair tractor according to claim 1, characterized in that The front connecting device (12) comprises an adjuster (15), one end of which is provided with a connecting sleeve (16) which is detachably mounted on a connecting sleeve (10), and the other end of which is rotatably provided with a connecting shaft (17), and both ends of the connecting shaft (17) are symmetrically provided with connecting rods (18), the connecting rod (18) and the connecting shaft (17) are movably connected via a pin, and the end of the connecting rod (18) is provided with a connecting clamp (19) which is detachably mounted on a front support rod of the wheelchair; an adjusting gear (30) is provided on the connecting shaft (17) located in the adjuster (15), and a gear forward rotation locking plate (23), a gear backward rotation locking plate (24), and a locking screw (25) for fixing the gear backward rotation locking plate (24) are respectively provided on the adjuster (15).

4. The angle-adjustable wheelchair tractor according to claim 3, characterized in that The gear forward rotation locking plate (23) and the gear backward rotation locking plate (24) are both provided with locking protrusions that cooperate with the adjusting gear (30), the gear forward rotation locking plate (23) and the gear backward rotation locking plate (24) are both movably mounted on the adjuster (15) via a pin shaft, and a torsion spring is provided at the connection between the gear forward rotation locking plate (23) and the adjuster (15).

5. The angle-adjustable wheelchair tractor according to claim 3, characterized in that The connecting clamp (19) is formed by hingedly connecting a fixed clamp (31) and a movable clamp (32); a locking handle (33) is hingedly connected to one side of the fixed clamp (31); an adjustable locking plate (35) is provided at the end of the locking handle (33); a locking hook is provided at one end of the adjustable locking plate (35); and a locking groove matching the locking hook is provided on the movable clamp (32); A group of connecting screws (37) is provided at the end of the locking handle (33), a group of connecting screw mounting holes is provided on the adjustable locking plate (35), the adjustable locking plate (35) is mounted on the group of connecting screws (37), and locking nuts (38) are screwed on the connecting screws (37) located on both sides of the adjustable locking plate (35).

6. The angle-adjustable wheelchair tractor according to claim 1, characterized in that A connecting seat (40) is detachably mounted on the connecting sleeve (10), and a locking and positioning slot is provided on the connecting seat (40). A plug-in block (41) is provided on the vehicle head support frame (11), and the plug-in block (41) is mounted in the locking and positioning slot and locked by a screw.

7. The angle-adjustable wheelchair tractor according to claim 6, characterized in that The vehicle head support frame (11) is a U-shaped support frame, and anti-slip pads are respectively provided at both ends of the U-shaped support frame.

8. The angle-adjustable wheelchair tractor according to claim 1, characterized in that The brake handle (6) is adjustably mounted on the handle (4), the handle (4) being provided with a fixed toothed ring (50), the brake handle (6) being provided with a connecting ring (51) for use in conjunction with the fixed toothed ring (50), the connecting ring (51) being provided with a pair of locking rods (52) in opposite directions for locking in conjunction with the fixed toothed ring (50), the locking rods (52) being movably mounted on the connecting ring (51) through a spring.

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