CN111803290A - A manual wheelchair - Google Patents

Abstract

A manual obstacle-surmounting wheelchair belongs to the field of wheelchairs. In order to solve the problems of complex structure and high cost of the existing obstacle-surmounting wheelchair, and the original structure of the ordinary manual wheelchair has been changed, the present invention includes a wheelchair and an obstacle-surmounting device. The obstacle crossing device includes a support unit, a drive unit and a motion unit, the support unit is arranged on the wheelchair, and the support unit is fixedly connected with the wheelchair, the drive unit is installed on the support unit, and the drive end of the drive unit is arranged on one side of the wheelchair. On the other hand, the moving unit is arranged below the driving unit, and the moving unit is drivingly connected with the driving unit. The present invention is mainly used for disabled persons who can walk alone by using a wheelchair when they encounter small steps.

Description

A manual wheelchair

technical field

The invention belongs to the field of wheelchairs, and in particular relates to a manual obstacle-crossing wheelchair.

Background technique

With the aging development of my country's population, the elderly and people with lower extremity disabilities account for an increasing proportion of my country's population. According to statistics, there are currently about 250 million elderly people over 60 years old in my country, and it is expected to reach 300 million in 2025, and the degree of aging is deepening. On the other hand, there are currently about 82.96 million disabled persons in my country, accounting for about 6.34% of the total population of our country. Among them, the elderly and those with lower limb disabilities who are inconvenient to walk mostly choose wheelchairs as their means of transportation, or use wheelchairs alone, or accompanied by family members or caregivers to carry out daily activities. However, when encountering obstacles such as steps, it is difficult for the elderly and the disabled with lower limbs to use ordinary manual wheelchairs alone, thus limiting their range of activities and affecting their daily life.

At present, ordinary manual wheelchairs on the market have the advantages of labor-saving, fast and stable operation when walking on flat ground, but their disadvantage is that the ability to overcome obstacles is low. When encountering low obstacles such as steps, users cannot rely on them. Self-straddle, which brings inconvenience to the daily life of wheelchair users. There are mainly two structural schemes for the obstacle-surmounting function of wheelchairs at home and abroad. One is the improvement of the walking mechanism, such as the use of crawler tracks, planetary wheels, humanoid legs, elliptical wheels, etc., to enhance its active obstacle-surmounting ability; the other is The improvement of the car body structure, such as the use of multiple sets of link mechanisms and mobile suspension mechanisms, passively adapt to changes in terrain. Although these improvements can realize the obstacle-surmounting function of the wheelchair, the structure is relatively complex, the cost is high, and the original structure of the ordinary manual wheelchair has been changed. The present invention designs a manual obstacle-surmounting wheelchair, and an obstacle-surmounting device is added to the existing wheelchair. The device is installed on the wheelchair, and the obstacle-surmounting mechanism can be manipulated by the user's own strength to overcome obstacles, thereby improving the adaptability of the wheelchair. , which expands the range of activities of the wheelchair user; when the obstacle crossing device is not needed, the device can be removed without changing the original structure of the ordinary manual wheelchair.

SUMMARY OF THE INVENTION

In order to solve the problems of complex structure and high cost of the existing obstacle-surmounting wheelchair, the present invention has changed the original structure of the common manual wheelchair, and further provides a manual obstacle-surmounting wheelchair;

A manual obstacle-surmounting wheelchair, which includes a wheelchair and an obstacle-surmounting device, the obstacle-surmounting device includes a support unit, a drive unit and a motion unit, the support unit is arranged on the wheelchair, the support unit is fixedly connected with the wheelchair, and the drive unit is installed on the support unit, the driving end of the driving unit is arranged on one side of the wheelchair, the moving unit is arranged below the driving unit, and the moving unit is connected with the driving unit in a transmission;

Further, the support unit includes a handle bracket and two support groups, the handle bracket is arranged on one side of the wheelchair, and the handle bracket is fixedly connected to the wheelchair side frame, and the two support groups are symmetrically arranged along the center line of the wheelchair width direction, Each group of support frames includes an upper support frame and a lower support frame. The upper support frame is arranged at the back of the wheelchair and is fixedly connected with the wheelchair back bracket. The lower support frame is arranged below the upper support frame, and the lower support frame is connected to the wheelchair. The wheel brackets are fixedly connected, the output end of the drive unit is arranged in the middle of the two support groups, and the output end of the drive unit is installed on the two support groups, and the drive end of the drive unit is installed on the handle bracket;

Further, the drive unit includes a drive handle, a primary bevel gear mechanism, a front transmission shaft, a universal joint, a rear transmission shaft, a secondary bevel gear mechanism, a screw assembly, a first bearing seat assembly and a second bearing seat Assembly, the drive handle is inserted into the input gear in the first-stage bevel gear mechanism, the input gear is rotatably connected with the handle bracket through the support shaft, and one end of the front drive shaft is inserted into the output gear in the first-stage bevel gear mechanism, the front drive The other end of the shaft is connected to one end of the rear drive shaft through a universal coupling, the other end of the rear drive shaft is inserted into the input gear in the secondary bevel gear mechanism, and the output gear in the secondary bevel gear mechanism is sleeved on the screw. On the assembly, the first bearing seat assembly and the second bearing seat assembly are both sleeved on the screw assembly. The first bearing seat assembly is arranged above the secondary bevel gear mechanism and is fixedly connected with the two upper support frames. The second bearing seat assembly It is arranged below the secondary bevel gear mechanism and is fixedly connected with the two lower support frames;

Further, the first bearing seat assembly includes a bearing, a bearing seat and two connecting rods, the bearing is arranged in the bearing seat, and the bearing outer ring of the bearing is fixedly connected with the bearing seat, the bearing is sleeved on the screw assembly, and the bearing The inner ring of the bearing is fixedly connected with the screw assembly, two connecting rods are symmetrically arranged on the outer surface of the bearing seat, one end of each connecting rod is fixedly connected with the bearing seat, and the other end of each connecting rod is fixedly connected with an upper support frame , the structure of the second bearing seat assembly is the same as that of the first bearing seat assembly, and one end of each connecting rod in the second bearing seat assembly is fixedly connected to a lower support frame;

Further, the screw assembly includes a hollow shaft, a fixed sleeve, a sliding key, a lead screw and a large nut, the inner wall of the hollow shaft is processed with a sliding key groove, the sliding key is arranged in the sliding key groove, and the sliding key is slidably connected with the sliding key groove, The fixed sleeve is arranged inside the hollow shaft, and the sliding key is fixedly connected with the fixed sleeve through screws. One end of the lead screw is inserted into the fixed sleeve, and the other end of the lead screw extends to the outside of the hollow shaft and passes through the large nut. It is threadedly connected with the large nut, the large nut is fixed on the lower end surface of the second bearing seat assembly through bolts, the bearing in the first bearing seat assembly is sleeved on the upper end of the hollow shaft, and the bearing in the second bearing seat assembly is sleeved in the hollow shaft. the lower end of the shaft;

Further, the motion unit includes a sleeve, an upper thrust bearing, a lower thrust bearing, a clamping nut, a coupling, a worm, a worm gear shaft, a worm gear, two propulsion wheels and a connecting frame assembly, a sleeve, an upper thrust bearing, The connecting frame assembly, the lower thrust bearing and the clamping nut are sequentially sheathed on the other end of the lead screw from top to bottom. The other end of the lead screw is connected to one end of the worm through a coupling. On the worm gear shaft, the worm gear shaft is arranged at the lower part of the connecting frame assembly, and the connecting frame assembly is rotatably connected with the worm gear shaft, the two ends of the worm gear shaft respectively extend to the outside of the connecting frame assembly, and a push wheel is sleeved on each end of the worm gear shaft;

Further, the connecting frame assembly includes a connecting plate, two connecting ears and four connecting studs, the top surface of the connecting plate is machined with a No. 1 through hole near the center of the edge, and the other end of the lead screw is provided with a No. 1 through hole. The four corners of the top surface of the connecting plate are respectively machined with a No. 2 through hole, one end of each connecting stud is set in a No. 2 through hole, and each connecting stud is fixedly connected to the connecting plate through a nut. The lugs are symmetrically arranged below the connecting plate relative to the No. 1 through hole, each connecting lug is machined with two No. 3 through holes, the other end of each connecting stud is set in a No. 3 through hole, and each connecting stud It is fixedly connected to a connecting lug through a nut, a No. 4 through hole is machined on the side wall of each connecting lug, the worm gear shaft is arranged in the two No. 4 through holes, and a worm gear shaft and each connecting lug are provided with a Bearings, the bearing outer ring of each bearing is fixedly connected with a connecting ear, the bearing inner ring of each bearing is fixedly connected with the worm gear shaft, the worm gear is arranged between the two connecting ears, and each propulsion wheel is arranged on the outer side of one connecting ear ;

Further, a guide rod is also provided on the top surface of the connecting plate, and one end of the guide rod is fixedly connected with the top surface of the connecting plate. A guide ring is provided on the bearing seat in the second bearing seat assembly, and the guide rod passes through the guide ring. and slidingly connected with the guide ring;

Further, the handle bracket is also provided with a front drive shaft support seat assembly, the front drive shaft support seat assembly includes a front drive shaft support seat and a front drive shaft support bearing, the front drive shaft support seat is fixed on the handle bracket, and the front drive shaft support seat is fixed on the handle bracket. The drive shaft support bearing is arranged in the front drive shaft support seat, and the front drive shaft support bearing is sleeved on the front drive shaft, the bearing inner ring of the front drive shaft support bearing is fixedly connected with the front drive shaft, and the outer bearing of the front drive shaft support bearing is The ring is fixedly connected with the front drive shaft support seat;

Further, the upper support frame on one side of the handle bracket is also provided with a rear drive shaft support seat assembly, and the rear drive shaft support seat assembly includes a rear drive shaft support seat and a rear drive shaft support bearing, and the rear drive shaft support seat is fixedly connected to the On the upper support frame, the rear drive shaft support bearing is arranged in the rear drive shaft support seat, and the rear drive shaft support bearing is sleeved on the rear drive shaft, and the inner ring of the bearing of the rear drive shaft support bearing is fixedly connected with the rear drive shaft. The bearing outer ring of the shaft support bearing is fixedly connected with the rear drive shaft support seat.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides a manual obstacle-surmounting wheelchair, which adds an obstacle-surmounting device while realizing the basic functions of the original ordinary wheelchair. The obstacle surmounting device is placed behind the wheelchair, and has a simple and compact structure, small footprint, and low cost, and the user can independently control the wheelchair obstacle surmounting device to realize the obstacle surmounting function.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is the side view of the present invention;

Fig. 3 is the top view of the present invention;

4 is a schematic diagram of the first bearing seat assembly in the present invention;

Fig. 5 is the schematic diagram of the screw assembly in the present invention;

6 is a schematic diagram of a connecting frame assembly in the present invention;

Fig. 7 is a partial enlarged view of the drive handle in the present invention;

In the figure 1 handle bracket, 2 upper support frame, 3 lower support frame, 4 first stage bevel gear mechanism, 5 front drive shaft, 6 universal coupling, 7 rear drive shaft, 8 second stage bevel gear mechanism, 9 first drive shaft Bearing seat assembly, 91 bearing, 92 bearing seat, 93 two connecting rods, 10 second bearing seat assembly, 101 connecting rod, 11 driving handle, 12 hollow shaft, 13 fixed sleeve, 14 feather key, 15 lead screw, 16 large Nut, 17 sleeve, 18 upper thrust bearing, 19 lower thrust bearing, 20 clamping nut, 21 coupling, 22 worm, 23 worm gear shaft, 24 worm gear, 25 thrust wheel, 26 connecting plate, 27 connecting ear, 28 connecting Stud, 29 guide rod, 30 guide ring, 31 front drive shaft support seat, 32 front drive shaft support bearing, 33 rear drive shaft support seat and 34 rear drive shaft support bearing.

Detailed ways

Embodiment 1: This embodiment will be described with reference to FIG. 1. This embodiment provides a manual obstacle-surmounting wheelchair, which includes a wheelchair and an obstacle-surmounting device. The obstacle-surmounting device includes a support unit, a drive unit and a motion unit. The support unit is arranged on the wheelchair, and the support unit is fixedly connected with the wheelchair, the drive unit is installed on the support unit, and the drive end of the drive unit is arranged on one side of the wheelchair, the movement unit is arranged below the drive unit, and the movement unit is connected to the drive unit. Unit drive connection.

The present invention adds an obstacle crossing device while realizing the basic functions of the original ordinary wheelchair. The obstacle surmounting device is placed behind the wheelchair, and has a simple and compact structure, small footprint, and low cost, and the user can independently control the wheelchair obstacle surmounting device to realize the obstacle surmounting function.

Embodiment 2: This embodiment is described with reference to FIG. 1 . This embodiment further defines the support unit described in Embodiment 1. In this embodiment, the support unit includes a handle bracket 1 and two support assemblies. The handle bracket 1 is arranged on one side of the wheelchair, and the handle bracket 1 is fixedly connected to the wheelchair side frame. The two support groups are arranged symmetrically along the center line of the wheelchair width direction, and each group of support groups includes an upper support frame 2 and a lower support Frame 3, the upper support frame 2 is arranged at the back of the wheelchair and is fixedly connected with the wheelchair back support, the lower support frame 3 is arranged below the upper support frame, and the lower support frame 3 is fixedly connected with the wheelchair wheel bracket, and the output of the drive unit The output end of the drive unit is installed on the two support assemblies, and the drive end of the drive unit is installed on the handle bracket. Other components and connection methods are the same as in the first embodiment.

In this embodiment, the support unit mainly plays a supporting role. The drive unit and the motion unit can be connected to the wheelchair through the support frame. The upper support frame 2 is an inverted L-shaped structure, and the vertical rod of the upper support frame 2 is fixedly connected to the wheelchair back support. , the horizontal rod of the upper support frame 2 has an included angle with the seat back, and the included angle is 30°-45°. This setting is to avoid the two upper support frames 2 being too close to the seat back, which may occur when the first bearing support seat 9 is installed. interference, the lower support frame 3 is in a "Z" shape, the two lower support frames 3 are arranged in parallel with each other, the lower horizontal rod in the lower support frame 3 is fixedly connected with the wheel of the wheelchair, and the upper horizontal rod in the lower support frame 3 It is used to support the second bearing seat assembly 10. The handle bracket 1 is fixed on one side of the wheelchair. According to the operator's habit, the main hand is the left hand or the right hand. The handle bracket 1 is fixed on the side that is easy to operate, so that the user can operate the handle independently. The drive end of the drive unit on bracket 1.

Embodiment 3: This embodiment is described with reference to FIG. 1 . This embodiment further defines the drive unit described in Embodiment 2. In this embodiment, the drive unit includes a drive handle 11 and a first-stage bevel gear mechanism. 4. Front drive shaft 5, universal joint 6, rear drive shaft 7, secondary bevel gear mechanism 8, screw assembly, first bearing seat assembly 9 and second bearing seat assembly 10, the drive handle 11 is inserted into a On the support shaft of the input gear in the first-stage bevel gear mechanism 4, the input gear is rotatably connected with the handle bracket 1 through the support shaft, and one end of the front drive shaft 5 is inserted into the output gear in the first-stage bevel gear mechanism 4. The other end of 5 is connected to one end of the rear drive shaft 7 through the universal coupling 6, and the other end of the rear drive shaft 7 is inserted into the input gear in the secondary bevel gear mechanism 8. The output gear is sleeved on the screw assembly, the first bearing seat assembly 9 and the second bearing seat assembly 10 are both sleeved on the screw assembly, the first bearing seat assembly 9 is arranged above the secondary bevel gear mechanism and is connected with the two upper support frames. 2 Fixed connection, the second bearing seat assembly 10 is arranged below the secondary bevel gear mechanism 8 and is fixedly connected with the two lower support frames 3 . Other compositions and connection methods are the same as those in the second embodiment.

In this embodiment, the driving handle 11 is a rocking handle, one end of the rocking handle is inserted into the support shaft of the input gear of the primary bevel gear mechanism 4 , and the center hole of the driving gear of the primary bevel gear mechanism 4 is fixedly connected to the support shaft , the support shaft is arranged coaxially with one end of the rocking handle, the support shaft is inserted on the handle bracket, and a bearing is arranged between the support shaft and the handle bracket 1, the bearing inner ring of the bearing is fixedly connected with the support shaft, and the bearing outer ring of the bearing is It is fixedly connected with the handle bracket, so that the user can drive the input gear to rotate by shaking the handle, and at the same time drive the primary bevel gear mechanism 4 to work, transmit the torque to the secondary bevel gear mechanism 8, and make the output in the secondary bevel gear mechanism 8 work. The gear drives the screw assembly to rotate.

Embodiment 4: This embodiment is described with reference to FIG. 4 . This embodiment further defines the first bearing seat assembly 9 described in Embodiment 3. In this embodiment, the first bearing seat assembly 9 includes a bearing 91. Bearing seat 92 and two connecting rods 93, the bearing 91 is arranged in the bearing seat 92, and the bearing outer ring of the bearing 91 is fixedly connected with the bearing seat, the bearing 91 is sleeved on the screw assembly, and the bearing inner ring of the bearing 91 Fixed connection with the screw assembly, two connecting rods 93 are symmetrically arranged on the outer circular surface of the bearing seat 92, one end of each connecting rod 93 is fixedly connected with the bearing seat 92, and the other end of each connecting rod 93 is connected with an upper support frame 2. Fixed connection. The structure of the second bearing seat assembly 10 is the same as that of the first bearing seat assembly 9 . One end of each connecting rod 101 in the second bearing seat assembly 10 is fixedly connected to a lower support frame 3 . Other components and connection methods are the same as those in the third embodiment.

In this embodiment, the first bearing seat assembly and the second bearing seat assembly are used to ensure that the screw assembly can rotate, and are also important parts for supporting the screw assembly.

Embodiment 5: This embodiment is described with reference to FIG. 5 . This embodiment further defines the spiral assembly described in Embodiment 4. In this embodiment, the spiral assembly includes a hollow shaft 12 , a fixed sleeve 13 , a sliding The key 14, the lead screw 15 and the large nut 16, the inner wall of the hollow shaft 12 is machined with a sliding key groove, the sliding key 14 is arranged in the sliding key groove, and the sliding key 14 is slidably connected with the sliding key groove, and the fixed sleeve 13 is arranged inside the hollow shaft 12 , and the sliding key 14 is fixedly connected with the fixing sleeve 13 by screws, one end of the screw 15 is inserted into the fixing sleeve 13, the other end of the screw 15 is arranged outside the hollow shaft 12 and passes through the oversized nut 16, and the screw 15 is inserted into the fixing sleeve 13. 15 is threadedly connected with the large nut 16, the large nut is fixed on the lower end surface of the second bearing seat assembly by bolts, the bearing in the first bearing seat assembly is sleeved on the upper end of the hollow shaft, and the bearing in the second bearing seat assembly is sleeved at the lower end of the hollow shaft. Other components and connection methods are the same as those in the fourth embodiment.

In this embodiment, when the hollow shaft is rotated by the output gear in the secondary bevel gear mechanism 8, the fixed sleeve 13 in the hollow shaft 12 will rotate together with the lead screw 15, and the other end of the lead screw 15 is connected with the large nut 16 Threaded connection, when the lead screw 15 is rotated, since the large nut 16 is already fixed, the lead screw will extend or retract through the large nut 16 with the direction of rotation, and at the same time when the lead screw 15 is extended or retracted. , the fixed sleeve will slide up and down on the hollow shaft 12 driven by the sliding key. In fact, the function of the screw assembly is to adjust the position of the moving unit through the extension or retraction of the lead screw relative to the hollow shaft 12. In order to facilitate the accurate connection of the lead screw and subsequent components, the lead screw passes through the lower part of one end of the large nut. A stepped shaft is formed, and the shoulders of each shaft segment in the stepped shaft can well position the subsequent sleeves, bearings and other parts.

Embodiment 6: This embodiment is described with reference to FIG. 5 . This embodiment further defines the motion unit of Embodiment 1. In this embodiment, the motion unit includes a sleeve 17 , an upper thrust bearing 18 , a lower Thrust bearing 19, clamping nut 20, coupling 21, worm 22, worm gear shaft 23, worm gear 24, two propulsion wheels 25 and connecting frame assembly, sleeve 17, upper thrust bearing 18, connecting frame assembly, lower thrust bearing 19. The clamping nut 20 is sequentially sleeved on the other end of the lead screw 15 from top to bottom. The other end of the lead screw 15 is connected to one end of the worm 22 through the coupling 21. The worm 22 is meshed with the worm wheel 24. The worm gear shaft 23 is sleeved on the worm gear shaft 23, and the worm gear shaft 23 is arranged at the lower part of the connecting frame assembly, and the connecting frame assembly is rotatably connected with the worm gear shaft 23. The two ends of the worm gear shaft 23 respectively extend to the outside of the connecting frame assembly. Set of one propulsion wheel 25. Other components and connection methods are the same as those in the fifth embodiment.

In this embodiment, the connecting frame assembly is connected to the end of the lead screw 15 through the upper thrust bearing 18, the lower thrust bearing 19 and the clamping nut 20 (if the end of the lead screw is a stepped shaft, they are all sleeved on the stepped shaft), The connecting frame assembly can follow the lifting motion of the lead screw 15 to move together, and the worm 22 can rotate coaxially with the lead screw 15 through the coupling 21. Because the worm 22 and the worm wheel 24 are meshed with teeth, a meshing transmission is formed. The lower worm wheel 24 rotates, and the worm wheel 24 drives the worm wheel shaft 23 and the propulsion wheels 25 at both ends of the worm wheel shaft 23 to rotate together.

Embodiment 7: This embodiment is described with reference to FIG. 6 . This embodiment further defines the connection frame assembly described in Embodiment 6. In this embodiment, the connection frame assembly includes a connection plate 26 and two connection ears. 27 and four connecting studs 28, a No. 1 through hole is processed on the top surface of the connecting plate 26 near the center of the edge, the other end of the lead screw 15 is arranged in a No. 1 through hole, and the four corners of the top surface of the connecting plate 26 are processed respectively. There is a No. 2 through hole, one end of each connecting stud 28 is set in a No. 2 through hole, each connecting stud 28 is fixedly connected to the connecting plate 26 through a nut, and the two connecting ears 27 are symmetrical with respect to the No. 1 through hole. Set below the connecting plate, each connecting lug 27 is machined with two No. 3 through holes, the other end of each connecting stud 28 is set in a No. 3 through hole, and each connecting stud 28 is connected to a No. 3 through hole through a nut. The connecting lugs 27 are fixedly connected, and a No. 4 through hole is machined on the side wall of each connecting lug 27. The worm gear shaft 23 is arranged in the two No. 4 through holes, and between the worm gear shaft 23 and each connecting lug 27 A bearing, the bearing outer ring of each bearing is fixedly connected with a connecting lug, the bearing inner ring of each bearing is fixedly connected with the worm gear shaft, the worm gear is arranged between the two connecting ears 27, and each propulsion wheel 25 is arranged in a connection outside of the ear. Other components and connection methods are the same as those in the sixth embodiment.

In this embodiment, the connecting plate is provided between the upper thrust bearing 18 and the lower thrust bearing 19, and the upper thrust bearing 18 and the lower thrust bearing 19 can clamp the connecting plate 26 through the clamping nut 20, and the connecting plate 26 The lead screw 15 can be raised and lowered, and at the same time, the connecting frame assembly and the worm gear 24, the worm gear shaft 23 and the propulsion wheel 25 mounted on the connecting frame assembly can be moved up and down together.

Embodiment 8: This embodiment is described with reference to FIG. 5 . This embodiment further defines the connecting plate 26 described in Embodiment 7. In this embodiment, a guide rod is further provided on the top surface of the connecting plate 26 29. One end of the guide rod 29 is fixedly connected with the top surface of the connecting plate 26. The bearing seat in the second bearing seat assembly 10 is provided with a guide ring 30. The guide rod 29 passes through the guide ring 30 and is slidably connected with the guide ring 30. Other components and connection modes are the same as those in the seventh embodiment.

In this embodiment, the role of the guide rod is to ensure that the connecting plate assembly can move in a straight line when the lead screw moves up and down, so as to avoid offset, which will cause the propulsion wheel to be out of sync when it contacts the ground, causing the user to use Deviations occur, leading to accidents.

Embodiment 9: This embodiment is described with reference to FIG. 1 and FIG. 2 . This embodiment further defines the handle bracket 1 described in Embodiment 2. In this embodiment, the handle bracket 1 is further provided with a front drive The shaft support seat assembly, the front drive shaft support seat assembly includes a front drive shaft support seat 31 and a front drive shaft support bearing 32, the front drive shaft support seat 31 is fixed on the handle bracket, and the front drive shaft support bearing 32 is arranged on the front drive shaft. In the support seat 31, and the front drive shaft support bearing 32 is sleeved on the front drive shaft, the bearing inner ring of the front drive shaft support bearing 32 is fixedly connected with the front drive shaft 5, and the bearing outer ring of the front drive shaft support bearing 32 is connected with the front drive shaft 5. The shaft support base 31 is fixedly connected. Other compositions and connection methods are the same as those in the second embodiment.

In this embodiment, the front drive shaft support seat assembly is used to support the front drive shaft 5 to prevent the front drive shaft 5 from hanging in the air, so that the output gear and the input gear in the first-stage bevel gear mechanism 4 cannot be effectively meshed, resulting in transmission failure.

Embodiment 10: This embodiment is described with reference to FIG. 1 and FIG. 2 . This embodiment further defines the obstacle surmounting device described in Embodiment 1. In this embodiment, the upper support frame 2 on the side close to the handle bracket is There is also a rear drive shaft support seat assembly, the rear drive shaft support seat assembly includes a rear drive shaft support seat 33 and a rear drive shaft support bearing 34, the rear drive shaft support seat 33 is fixed on the upper support frame 2, and the rear drive shaft supports The bearing 34 is arranged in the rear drive shaft support seat 33, and the rear drive shaft support bearing 34 is sleeved on the rear drive shaft 7, the inner ring of the bearing of the rear drive shaft support bearing 34 is fixedly connected with the rear drive shaft 7, and the rear drive shaft supports the bearing. The bearing outer ring of 34 is fixedly connected with the rear drive shaft support seat 33 . Other components and connection methods are the same as in the first embodiment.

In this embodiment, the rear drive shaft support seat assembly is used to support the rear drive shaft 7 to prevent the rear drive shaft 7 from hanging in the air, so that the output gear and the input gear in the secondary bevel gear mechanism 8 cannot be effectively meshed, resulting in transmission failure. Considering the positional relationship between the first-stage bevel gear drive 4 and the second-stage bevel gear drive 8, in order to avoid the interference between the drive shaft and the wheelchair, a double universal Bearings support the drive shaft.

working principle

When the wheelchair encounters a step obstacle, the wheelchair is tilted backward by a certain angle through the change of the center of gravity of the user on the wheelchair and the coordination of the auxiliary support rod (the auxiliary support rod refers to a crutch or a cane, and the wheelchair user must go out alone tools with assisting walking), make the front wheel of the wheelchair suspended and higher than the step surface, at this time the push wheel and the driving wheel touch the ground, at this time, turn the driving handle to make the lead screw rotate and move downward, which will drive the push wheel Move the wheelchair forward and gradually lift the wheelchair rear frame.

When the rear frame of the wheelchair is lifted and the front wheel of the wheelchair is on the steps, continue to turn the joystick to make the lead screw continue to extend downward, drive the big wheel to lift the front wheel as a fulcrum, and at the same time the push wheel continues to push the wheelchair forward. At this point, the wheelchair wheel has been lifted, and the push wheel and seat wheel are on the ground. The propulsion wheel continues to advance and the rear frame of the wheelchair continues to lift until more than half of the large wheel rises to the step surface, and then the driving handle is turned in the opposite direction, the propulsion wheel quickly leaves the ground and gradually retracts, and the obstacle climbing process is over. The maximum obstacle clearance height set by this device is 200mm.

Claims (10)

1. The utility model provides a manual wheelchair that hinders more, it includes the wheelchair and hinders the device more, its characterized in that: the obstacle crossing device comprises a supporting unit, a driving unit and a moving unit, wherein the supporting unit is arranged on the wheelchair and is fixedly connected with the wheelchair, the driving unit is arranged on the supporting unit, the driving end of the driving unit is arranged on one side of the wheelchair, the moving unit is arranged below the driving unit, and the moving unit is in transmission connection with the driving unit.

2. A manual obstacle crossing wheelchair as claimed in claim 1, wherein: the support unit comprises a handle support (1) and two support group frames, the handle support (1) is arranged on one side of the wheelchair, the handle support (1) is fixedly connected with the side frame of the wheelchair, the two support group frames are symmetrically arranged along the center line of the width direction of the wheelchair, each support group frame comprises an upper support frame (2) and a lower support frame (3), the upper support frame (2) is arranged at the back of the wheelchair and is fixedly connected with the back support of the wheelchair, the lower support frames (3) are arranged below the upper support frames, the lower support frames (3) are fixedly connected with the wheel part supports of the wheelchair, the output end of the drive unit is arranged between the two support group frames, the output end of the drive unit is arranged on the two support group frames, and the drive end of the drive unit is arranged on the handle support.

3. A manual obstacle crossing wheelchair as claimed in claim 2, wherein: the driving unit comprises a driving handle (11), a primary bevel gear mechanism (4), a front driving shaft (5), a universal coupling (6), a rear driving shaft (7), a secondary bevel gear mechanism (8), a spiral assembly, a first bearing seat assembly (9) and a second bearing seat assembly (10), wherein the driving handle (11) is inserted on a supporting shaft of an input gear in the primary bevel gear mechanism (4), the input gear is rotatably connected with a handle bracket (1) through the supporting shaft, one end of the front driving shaft (5) is inserted on an output gear in the primary bevel gear mechanism (4), the other end of the front driving shaft (5) is connected with one end of the rear driving shaft (7) through the universal coupling (6), the other end of the rear driving shaft (7) is inserted on the input gear in the secondary bevel gear mechanism (8), the output gear in the secondary bevel gear mechanism (8) is sleeved on the spiral assembly, first bearing seat subassembly (9) and second bearing seat subassembly (10) all suit on spiral component, first bearing seat subassembly (9) set up in second grade bevel gear mechanism's top and with two upper strut frame (2) fixed connection, second bearing seat subassembly (10) set up in second grade bevel gear mechanism (8) the below and with two lower strut frame (3) fixed connection.

4. A manual obstacle crossing wheelchair as claimed in claim 3, wherein: first bearing frame subassembly (9) are including bearing (91), bearing frame (92) and two connecting rods (93), bearing (91) set up in bearing frame (92), and the bearing inner race and the bearing frame fixed connection of bearing (91), bearing (91) cover is established on spiral subassembly, and the bearing inner race and the spiral subassembly fixed connection of bearing (91), two connecting rods (93) symmetry set up on the outer disc of bearing frame (92), the one end and the bearing frame (92) fixed connection of every connecting rod (93), the other end and an upper support frame (2) fixed connection of every connecting rod (93), the structure of second bearing frame subassembly (10) is the same with the structure of first bearing frame subassembly (9), the one end and a lower support frame (3) fixed connection of every connecting rod (101) in second bearing frame subassembly (10).

5. A manual obstacle crossing wheelchair as claimed in claim 4, wherein: the screw component comprises a hollow shaft (12), a fixed sleeve (13), a sliding key (14), a screw rod (15) and a large nut (16), a sliding key groove is processed on the inner wall of the hollow shaft (12), the sliding key (14) is arranged in the sliding key groove, the sliding key (14) is connected with the sliding key slot in a sliding way, the fixed sleeve (13) is arranged inside the hollow shaft (12), the sliding key (14) is fixedly connected with the fixed sleeve (13) through a screw, one end of a lead screw (15) is inserted in the fixed sleeve (13), the other end of the screw rod (15) is arranged outside the hollow shaft (12) and passes through a large nut (16), and the screw rod (15) is in threaded connection with a large nut (16), the large nut is fixedly connected to the lower end face of the second bearing seat assembly through a bolt, a bearing in the first bearing seat assembly is sleeved at the upper end of the hollow shaft, and a bearing in the second bearing seat assembly is sleeved at the lower end of the hollow shaft.

6. A manual obstacle crossing wheelchair as claimed in claim 5, wherein: the moving unit comprises a sleeve (17), an upper thrust bearing (18), a lower thrust bearing (19), a clamping nut (20), a coupler (21), a worm (22), a worm wheel shaft (23), a worm wheel (24), two thrust wheels (25) and a connecting frame component, wherein the sleeve (17), the upper thrust bearing (18), the connecting frame component, the lower thrust bearing (19) and the clamping nut (20) are sequentially sleeved on the other end of a lead screw (15) from top to bottom, the other end of the lead screw (15) is connected with one end of the worm (22) through the coupler (21), the worm (22) is in tooth meshing arrangement with the worm wheel (24), the worm wheel (24) is sleeved on the worm wheel shaft (23), the worm wheel shaft (23) is arranged at the lower part of the connecting frame component, the connecting frame component is in rotating connection with the worm wheel shaft (23), two ends of the worm wheel shaft (23) respectively extend to the, each end of the worm wheel shaft (23) is sleeved with a propelling wheel (25).

7. A manual obstacle crossing wheelchair as claimed in claim 6, wherein: the connecting frame assembly comprises a connecting plate (26), two connecting lugs (27) and four connecting studs (28), a first through hole is processed at the position, close to the edge center, of the top surface of the connecting plate (26), the other end of a screw rod (15) is arranged in the first through hole, a second through hole is processed at the four corners of the top surface of the connecting plate (26), one end of each connecting stud (28) is arranged in the second through hole, each connecting stud (28) is fixedly connected with the connecting plate (26) through a nut, the two connecting lugs (27) are symmetrically arranged below the connecting plate relative to the first through hole, two third through holes are processed on each connecting lug (27), the other end of each connecting stud (28) is arranged in one third through hole, each connecting stud (28) is fixedly connected with one connecting lug (27) through a nut, a fourth through hole is processed on the side wall of each connecting lug (27), the worm wheel shaft (23) is arranged in the two fourth through holes, a bearing is arranged between the worm wheel shaft (23) and each connecting lug (27), the outer ring of the bearing of each bearing is fixedly connected with one connecting lug, the inner ring of the bearing of each bearing is fixedly connected with the worm wheel shaft, the worm wheel is arranged between the two connecting lugs (27), and each propulsion wheel (25) is arranged on the outer side of one connecting lug.

8. A manual obstacle crossing wheelchair as claimed in claim 7, wherein: the top surface of the connecting plate is also provided with a guide rod (29), one end of the guide rod (29) is fixedly connected with the top surface of the connecting plate (26), the middle bearing seat of the second bearing seat assembly (10) is provided with a guide ring (30), and the guide rod (29) penetrates through the guide ring (30) and is in sliding connection with the guide ring (30).

9. A manual obstacle crossing wheelchair as claimed in claim 8, wherein: still be equipped with preceding transmission shaft supporting seat subassembly on handle support (1), preceding transmission shaft supporting seat subassembly includes preceding transmission shaft supporting seat (31) and preceding transmission shaft support bearing (32), preceding transmission shaft supporting seat (31) rigid coupling is on handle support, preceding transmission shaft support bearing (32) set up in preceding transmission shaft supporting seat (31), and preceding transmission shaft support bearing (32) suit is on the preceding transmission shaft, the bearing inner circle and preceding transmission shaft (5) fixed connection of preceding transmission shaft support bearing (32), the bearing outer lane and preceding transmission shaft supporting seat (31) fixed connection of preceding transmission shaft support bearing (32).

10. A manual obstacle crossing wheelchair as claimed in claim 9, wherein: still be equipped with rear drive axle supporting seat subassembly on upper bracket (2) that is close to handle support one side, rear drive axle supporting seat subassembly includes rear drive axle supporting seat (33) and rear drive axle back bearing (34), rear drive axle supporting seat (33) rigid coupling is on upper bracket (2), rear drive axle back bearing (34) set up in rear drive axle supporting seat (33), and rear drive axle back bearing (34) suit is on rear drive axle (7), the bearing inner race and rear drive axle (7) fixed connection of rear drive axle back bearing (34), the bearing outer lane and rear drive axle supporting seat (33) fixed connection of rear drive axle back bearing (34).

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