Front wheel support structure of electric wheelchair

Abstract

The invention relates to the technical field of biomedical engineering, in particular to an electric wheelchair front wheel support structure which comprises a bottom plate, a rear wheel support and a front support, the rear wheel support is fixedly installed at one end of the bottom plate, the front support is fixedly installed at the end, away from the rear wheel support, of the bottom plate, and two sets of rolling wheels are rotatably installed at the bottom of the front support. Two groups of supporting plates are arranged above the bottom plate, two groups of rotating shafts are rotatably mounted in the supporting plates, mounting blocks are fixedly mounted at the two ends of each rotating shaft, and one group of mounting blocks is connected with a front support through a lifting assembly. According to the front wheel support structure of the electric wheelchair, the electric push rod is arranged and drives the push block to move upwards through the rotating piece, so that the supporting plate can be driven to move upwards, and the end, close to the rear wheel support, of the supporting plate is rotationally connected with the rotating shaft, so that the angle of the supporting plate can be adjusted; and the supporting plate is always in a horizontal state.

Description

Technical Field

[0001] The present invention relates to the technical field of biomedical engineering, and particularly to a front-wheel support structure for an electric wheelchair. Background Technique

[0002] A wheelchair is a chair equipped with wheels that can help replace walking. It is an important mobile tool for the wounded, sick, and disabled for home rehabilitation, transportation, medical treatment, and outdoor activities. A wheelchair is an important rehabilitation tool. It is not only a means of transportation for the physically disabled, but more importantly, it enables them to exercise their bodies and participate in social activities with the help of a wheelchair.

[0003] In traditional wheelchairs, the front-wheel support and the rear-wheel support are generally fixed or foldable. During actual use, when the wheelchair goes uphill and downhill, the patient is prone to tilt. For some roads with relatively large slopes, the patient needs to be fixed on the wheelchair, or the patient has to exert force to tightly hold the armrest of the wheelchair to ensure that the patient will not fall off the wheelchair, which poses certain safety hazards and affects the comfort of the wheelchair. Summary of the Invention

[0004] The purpose of the present invention is to provide a front-wheel support structure for an electric wheelchair to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A front-wheel support structure for an electric wheelchair, including a bottom plate, a rear-wheel support, and a front support. The rear-wheel support is fixedly installed at one end of the bottom plate, and the front support is fixedly installed at the end of the bottom plate away from the rear-wheel support. Two groups of rollers are rotatably installed at the bottom of the front support. Two groups of support plates are arranged above the bottom plate. Two groups of rotating shafts are rotatably installed inside the support plates. Installation blocks are fixedly installed at both ends of the rotating shafts. One of the installation blocks is connected to the front support through a lifting component, and the other installation block is connected to the rear-wheel support through a limiting component. A driving mechanism is arranged below the support plate.

[0006] Preferably, a slider is fixedly installed on one side of one of the installation blocks away from the rotating shaft. A chute is opened on the side of the rear-wheel support close to the installation block, and the slider is slidably connected to the chute.

[0007] Preferably, the lifting component includes a cross plate. A support block is slidably installed above the cross plate. The support block is fixedly connected to one of the installation blocks. A support frame is fixedly installed below the cross plate. A column is fixedly installed below the support frame. The column slidably penetrates the front support.

[0008] Preferably, the limiting component includes a groove which is formed on the adjacent side of two mounting blocks. A limiting block is slidably inserted into the groove. The limiting block is connected to the rear wheel bracket through an elastic structure. The end face of the limiting block away from the rear wheel bracket is inclined. An adjusting mechanism is arranged outside the limiting block.

[0009] Preferably, the elastic mechanism includes a fixed block which is fixedly installed on one side of the rear wheel bracket. An activity groove is formed inside the fixed block. The activity groove is slidably connected to the limiting block. A first spring is movably installed inside the activity groove. The first spring is fixedly connected to the limiting block.

[0010] Preferably, the adjusting mechanism includes a clamping block. A guide block is fixedly installed on the side of the clamping block close to the support plate. A guide groove is formed on one side of the support plate. The guide block is slidably connected to the guide groove. The clamping block is inserted and matched with the groove. The clamping block is in contact and cooperation with the limiting block. The clamping block is connected to the clamping block through a moving component.

[0011] Preferably, the moving component includes a pressing plate and a pushing plate. The pressing plate is connected to the support plate through a telescopic structure. One end of the pushing plate is rotatably connected to the pressing plate. The end of the pushing plate away from the pressing plate is rotatably connected to the clamping block.

[0012] Preferably, the telescopic structure includes a sleeve which is fixedly installed at the center outside the support plate. A rod is slidably inserted into the sleeve through a second spring. A mounting plate is fixedly installed on the outer surface of the rod. A mounting groove is formed inside the sleeve. The mounting groove is slidably connected to the mounting plate. A clamping groove is formed on the outer surface of the rod. The clamping groove is rotatably connected to the pressing plate.

[0013] Preferably, the driving mechanism includes an electric push rod which is slidably installed above the bottom plate. A pushing block is arranged above the electric push rod. The pushing block is connected to the output end of the electric push rod through a rotating part. The pushing block is slidably connected to the lower part of the support plate. The pushing block is connected to the pressing plate through a pushing structure.

[0014] Preferably, the pushing structure includes a mounting seat which is slidably installed on the side of the pushing block close to the pressing plate. A pushing part is rotatably installed on the side of the mounting seat away from the pushing block. The end of the pushing part away from the mounting seat is rotatably connected to the pressing plate. Two magnets are fixedly installed under the support plate. The pushing block has magnetism. The pushing block and the magnets attract each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting an electric push rod, the electric push rod drives a push block to move upward through a rotating member, thereby being able to drive a support plate to move upward. Since one end of the support plate close to the rear wheel bracket is rotatably connected to a rotating shaft, the angle of the support plate can be adjusted, so that when going uphill and downhill, the support plate is always in a horizontal state, and the patient will not tilt when sitting on the wheelchair, which is beneficial to improving the safety of the device.

[0017] 2. By setting an installation block, the connection state between the installation block and the rear wheel bracket can be adjusted under the cooperation of a limit block and a clamping block. When the installation block is fixedly connected to the rear wheel bracket, the angle of the support plate can be adjusted. When the installation block is fixedly connected to the clamping block, the support plate can lift inside the rear wheel bracket, which is convenient for moving the patient to a high place, making the application range of the device wider.

[0018] 3. By setting a push block, a pressing plate drives a pushing member to adjust the position of the push block, so that the electric push rod can move to the center of the support plate or move to a position close to the front bracket, which is beneficial to increasing the stability when the support plate lifts, making the force on the support plate more uniform, and also making it more labor-saving when adjusting the angle of the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a structural sectional view of the present invention;

[0021] Figure 3 is a schematic diagram of a partial structure of the present invention;

[0022] Figure 4 is a partial structural sectional view of the present invention;

[0023] Figure 5 is the present invention Figure 4 magnified view of part A;

[0024] Figure 6 is a schematic diagram of a partial structure of the present invention;

[0025] Figure 7 is a partial structural sectional view of the present invention;

[0026] Figure 8 is a schematic diagram of the bottom structure of the support plate of the present invention.

[0027] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. bottom plate; 2. rear wheel bracket; 3. front bracket; 4. roller; 5. support block; 6. cross plate; 7. support frame; 8. electric push rod; 9. push block; 10. rotating member; 11. column; 12. pushing member; 13. mounting seat; 14. magnet; 15. support plate; 16. slider; 17. sliding groove; 18. mounting block; 19. rotating shaft; 20. groove; 21. limiting block; 22. movable groove; 23. first spring; 24. fixed block; 25. clamping block; 26. guide groove; 27. guide block; 28. pressing plate; 29. push plate; 30. sleeve; 31. rod member; 32. second spring; 33. mounting groove; 34. mounting plate; 35. clamping groove. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-8 , a front wheel bracket structure of an electric wheelchair shown in the figure, includes a bottom plate 1, a rear wheel bracket 2 and a front bracket 3. The rear wheel bracket is fixedly installed at one end of the bottom plate 1, and the front bracket 3 is fixedly installed at the end of the bottom plate 1 away from the rear wheel bracket 2. Two groups of rollers 4 are rotatably installed at the bottom of the front bracket 3. Two groups of support plates 15 are arranged above the bottom plate 1. Two groups of rotating shafts 19 are rotatably installed inside the support plates 15. Installation blocks 18 are fixedly installed at both ends of the rotating shaft 19. One group of installation blocks 18 is connected to the front bracket 3 through a lifting assembly, and the other group of installation blocks 18 is connected to the rear wheel bracket 2 through a limiting assembly. A driving mechanism is arranged below the support plate 15.

[0030] A slider 16 is fixedly installed on one side of one group of installation blocks 18 away from the rotating shaft 19. A sliding groove 17 is formed on one side of the rear wheel bracket 2 close to the installation block 18. The slider 16 is slidably connected to the sliding groove 17.

[0031] One group of installation blocks 18 is connected to the rear wheel bracket 2 through a limiting assembly. At this time, the installation block 18 and the rear wheel bracket 2 can be regarded as an integral body. Under the action of the bottom plate 1, the driving mechanism drives the support plate 15 to move upward, and the lifting assembly drives the support plate 15 to move upward. With the cooperation of the lifting assembly, the support plate 15 rotates around the rotating shaft 19 close to the rear wheel bracket 2, so as to be able to adjust the inclination angle of the support plate 15, so that the support plate 15 can be in a horizontal state when going uphill and downhill, so that the patient will not tilt when sitting on the wheelchair, which is beneficial to ensuring the stability of the patient when going uphill and downhill and increasing the safety of the wheelchair during use.

[0032] Adjust the limit component so that the mounting block 18 is slidably connected to the rear wheel bracket 2. At this time, the driving mechanism pushes the support plate 15 upward. The support plate 15 can be lifted above the bottom plate 1, so that the height of the patient can be adjusted as needed, facilitating the transfer of the patient from the wheelchair to other places, and making the application range of the device more extensive.

[0033] The lifting component includes a cross plate 6. A support block 5 is slidably installed above the cross plate 6. The support block 5 is fixedly connected to one set of mounting blocks 18. A support frame 7 is fixedly installed below the cross plate 6. A column 11 is fixedly installed below the support frame 7. The column 11 slidably penetrates through the front bracket 3.

[0034] Specifically, when the support plate 15 rotates around the rotating shaft 19, the support frame 7 is lifted above the front bracket 3 through the column 11. The support frame 7 drives the cross plate 6 to move synchronously. At this time, the rotating shaft 19 is rotatably connected to the support plate 15, and the mounting block 18 can drive the support block 5 to slide above the cross plate 6.

[0035] The limit component includes a groove 20. The groove 20 is opened on the adjacent side of the two mounting blocks 18. A limit block 21 is slidably inserted into the inside of the groove 20. The limit block 21 is connected to the rear wheel bracket 2 through an elastic structure. The end face of the limit block 21 away from the rear wheel bracket 2 is inclined. An adjusting mechanism is arranged outside the limit block 21.

[0036] The elastic mechanism includes a fixed block 24. The fixed block 24 is fixedly installed on one side of the rear wheel bracket 2. An activity groove 22 is opened inside the fixed block 24. The activity groove 22 is slidably connected to the limit block 21. A first spring 23 is movably installed inside the activity groove 22. The first spring 23 is fixedly connected to the limit block 21.

[0037] When the support plate 15 moves to the position of the fixed block 24, under the action of the first spring 23, the first spring 23 pushes the limit block 21 out of the inside of the activity groove 22, and the limit block 21 is inserted into the inside of the groove 20. At this time, the limit block 21 can limit the movement of the mounting block 18, so that the angle of the support plate 15 can be adjusted.

[0038] The adjusting mechanism includes a clamping block 25. A guide block 27 is fixedly installed on the side of the clamping block 25 close to the support plate 15. A guide groove 26 is opened on one side of the support plate 15. The guide block 27 is slidably connected to the guide groove 26. The clamping block 25 is inserted and matched with the groove 20. The clamping block 25 is in contact and cooperation with the limit block 21. The clamping block 25 is connected to the clamping block 25 through a moving component.

[0039] The moving component includes a pressing plate 28 and a pushing plate 29. The pressing plate 28 is connected to the support plate 15 through a telescopic structure. One end of the pushing plate 29 is rotatably connected to the pressing plate 28, and the end of the pushing plate 29 away from the pressing plate 28 is rotatably connected to the clamping block 25.

[0040] The telescopic structure includes a sleeve 30. The sleeve 30 is fixedly installed at the outer center of the support plate 15. A rod 31 is slidably inserted into the sleeve 30 through a second spring 32. An installation plate 34 is fixedly installed on the outer surface of the rod 31. An installation groove 33 is formed inside the sleeve 30, and the installation groove 33 is slidably connected to the installation plate 34. A clamping groove 35 is formed on the outer surface of the rod 31, and the clamping groove 35 is rotatably connected to the pressing plate 28.

[0041] In the initial state, the clamping block 25 does not contact the groove 20. Push the rod 31 into the sleeve 30. At this time, the second spring 32 deforms under force, and the installation plate 34 slides inside the installation groove 33. The rod 31 drives the pressing plate 28 to move synchronously. The pressing plate 28 drives the pushing plate 29 to rotate, and the pushing plate 29 pushes the clamping block 25 into the groove 20. At this time, the guide block 27 slides inside the guide groove 26. When the clamping block 25 is inserted into the groove 20, it contacts the limiting block 21 and pushes the limiting block 21 into the movable groove 22, causing the installation block 18 to separate from the fixed block 24. When the clamping block 25 is inserted into the groove 20, the rotating shaft 19 cannot rotate inside the support plate 15. When the installation plate 34 is located inside the sleeve 30, rotate the rod 31 to misalign the installation plate 34 with the installation groove 33, and the second spring 32 cannot push the rod 31 out of the sleeve 30. At the same time, the pressing plate 28 is rotatably connected to the clamping groove 35.

[0042] The driving mechanism includes an electric push rod 8. The electric push rod 8 is slidably installed above the bottom plate 1. A push block 9 is arranged above the electric push rod 8. The push block 9 is connected to the output end of the electric push rod 8 through a rotating part 10. The push block 9 is slidably connected to the lower part of the support plate 15. The push block 9 is connected to the pressing plate 28 through a pushing structure.

[0043] The pushing structure includes an installation seat 13. The installation seat 13 is slidably installed on the side of the push block 9 close to the pressing plate 28. A pushing part 12 is rotatably installed on the side of the installation seat 13 away from the push block 9. The end of the pushing part 12 away from the installation seat 13 is rotatably connected to the pressing plate 28. Two groups of magnets 14 are fixedly installed below the support plate 15. The push block 9 has magnetism, and the push block 9 and the magnets 14 attract each other.

[0044] Specifically, when the pressing plate 28 moves towards the support plate 15, the pressing plate 28 drives the pushing member 12 to rotate. The pushing member 12 drives the pushing block 9 to slide through the mounting seat 13. At this time, the pushing block 9 moves away from one set of magnets 14, and the other set of magnets 14 has a stronger magnetic force. The other set of magnets 14 attracts the pushing block 9, enabling the pushing block 9 to drive the electric push rod 8 to move to the center of the support plate 15. The electric push rod 8 is connected to an external power source. The electric push rod 8 drives the pushing block 9 to move upward through the rotating member 10, thereby providing power for the lifting of the support plate 15. Moreover, the position of the pushing block 9 can be adjusted, facilitating the adjustment of the position of the pushing block 9 as needed, which is beneficial to increasing the stability of the lifting of the support plate 15.

[0045] Working principle: When the support plate 15 moves to the position of the fixed block 24, under the action of the first spring 23, the first spring 23 pushes the limit block 21 out of the inner part of the movable groove 22, and the limit block 21 inserts into the inner part of the groove 20. At this time, the limit block 21 can limit the movement of the mounting block 18. The electric push rod 8 is connected to an external power source. The electric push rod 8 drives the pushing block 9 to move upward through the rotating member 10, and the pushing block 9 drives the support plate 15 to move synchronously. At this time, the angle of the support plate 15 can be adjusted.

[0046] When the support plate 15 rotates around the rotating shaft 19, the support frame 7 moves up and down above the front support 3 through the column 11, and the support frame 7 drives the cross plate 6 to move synchronously. At this time, the rotating shaft 19 is rotatably connected to the support plate 15, and the mounting block 18 can drive the support block 5 to slide above the cross plate 6.

[0047] In the initial state, the clamping block 25 does not contact the groove 20. When it is necessary to lift the support plate 15, the rod member 31 is pushed into the inner part of the sleeve 30. At this time, the second spring 32 is deformed under force, and the mounting plate 34 slides in the mounting groove 33. The rod member 31 drives the pressing plate 28 to move synchronously. The pressing plate 28 drives the push plate 29 to rotate, and the push plate 29 pushes the clamping block 25 to insert into the inner part of the groove 20. At this time, the guide block 27 slides in the guide groove 26. When the clamping block 25 inserts into the inner part of the groove 20, it contacts the limit block 21 and pushes the limit block 21 into the inner part of the movable groove 22, causing the mounting block 18 to separate from the fixed block 24. When the clamping block 25 inserts into the inner part of the groove 20, the rotating shaft 19 cannot rotate inside the support plate 15. When the mounting plate 34 is located inside the sleeve 30, the rod member 31 is rotated so that the mounting plate 34 is misaligned with the mounting groove 33, and the second spring 32 cannot push the rod member 31 out of the inner part of the sleeve 30. At the same time, the pressing plate 28 is rotatably connected to the clamping groove 35.

[0048] It should be noted that when the pressing plate 28 moves towards the support plate 15, the pressing plate 28 drives the pushing member 12 to rotate. The pushing member 12 drives the pushing block 9 to slide through the mounting seat 13. At this time, the pushing block 9 moves away from one set of magnets 14, and the other set of magnets 14 has a stronger magnetic force. The other set of magnets 14 attracts the pushing block 9, so that the pushing block 9 can drive the electric push rod 8 to move to the center of the support plate 15, facilitating the adjustment of the position of the pushing block 9 as needed.

[0049] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0050] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric wheelchair front wheel bracket structure, comprising a bottom plate (1), a rear wheel bracket (2) and a front bracket (3), characterized in that: The rear wheel bracket is fixedly installed at one end of the (2) bottom plate (1), and the front bracket (3) is fixedly installed at the end of the bottom plate (1) away from the rear wheel bracket (2). Two sets of rollers (4) are rotatably installed at the bottom of the front bracket (3). Two sets of support plates (15) are arranged above the bottom plate (1). Two sets of rotating shafts (19) are rotatably installed inside the support plates (15). Installation blocks (18) are fixedly installed at both ends of the rotating shaft (19). One of the installation blocks (18) is connected to the front bracket (3) through a lifting assembly, and the other installation block (18) is connected to the rear wheel bracket (2) through a limiting assembly. A driving mechanism is arranged below the support plate (15).

2. The front-wheel bracket structure of an electric wheelchair according to claim 1, wherein: A slider (16) is fixedly installed on one side of one of the installation blocks (18) away from the rotating shaft (19). A chute (17) is opened on one side of the rear wheel bracket (2) close to the installation block (18). The slider (16) is slidably connected to the chute (17).

3. The front wheel bracket structure of an electric wheelchair according to claim 1, characterized in that: The lifting assembly includes a cross plate (6). A support block (5) is slidably installed above the cross plate (6). The support block (5) is fixedly connected to one of the installation blocks (18). A support frame (7) is fixedly installed below the cross plate (6). A column (11) is fixedly installed below the support frame (7). The column (11) slidably penetrates through the front bracket (3).

4. The front-wheel bracket structure of an electric wheelchair according to claim 1, characterized in that: The limiting assembly includes a groove (20). The groove (20) is opened on the adjacent side of the two installation blocks (18). A limiting block (21) is slidably inserted into the groove (20). The limiting block (21) is connected to the rear wheel bracket (2) through an elastic structure. The end face of the limiting block (21) away from the rear wheel bracket (2) is inclined. An adjusting mechanism is arranged outside the limiting block (21).

5. The front wheel bracket structure of an electric wheelchair according to claim 4, characterized in that: The elastic mechanism includes a fixed block (24). The fixed block (24) is fixedly installed on one side of the rear wheel bracket (2). An activity groove (22) is opened inside the fixed block (24). The activity groove (22) is slidably connected to the limiting block (21). A first spring (23) is movably installed inside the activity groove (22). The first spring (23) is fixedly connected to the limiting block (21).

6. The front wheel bracket structure of an electric wheelchair according to claim 4, wherein: The adjusting mechanism includes a clamping block (25). A guide block (27) is fixedly installed on one side of the clamping block (25) close to the support plate (15). A guide groove (26) is opened on one side of the support plate (15). The guide block (27) is slidably connected to the guide groove (26). The clamping block (25) is inserted and matched with the groove (20). The clamping block (25) is in contact and cooperation with the limiting block (21). The clamping block (25) is connected to the clamping block (25) through a moving assembly.

7. The electric wheelchair front wheel support structure according to claim 6, characterized in that: The moving assembly includes a pressing plate (28) and a pushing plate (29). The pressing plate (28) is connected to the support plate (15) through a telescopic structure. One end of the pushing plate (29) is rotatably connected to the pressing plate (28). The end of the pushing plate (29) away from the pressing plate (28) is rotatably connected to the clamping block (25).

8. The front wheel support structure of an electric wheelchair according to claim 7, characterized in that: The telescopic structure includes a sleeve (30), the sleeve (30) is fixedly installed at the outer center of the support plate (15), a rod member (31) is slidably inserted into the sleeve (30) through a second spring (32), a mounting plate (34) is fixedly installed on the outer portion of the rod member (31), a mounting groove (33) is formed inside the sleeve (30), the mounting groove (33) is slidably connected to the mounting plate (34), a clamping groove (35) is formed on the outer surface of the rod member (31), and the clamping groove (35) is rotatably connected to a pressing plate (28).

9. The front-wheel bracket structure of an electric wheelchair according to claim 7, wherein: The driving mechanism includes an electric push rod (8), the electric push rod (8) is slidably installed above the bottom plate (1), a push block (9) is arranged above the electric push rod (8), the push block (9) is connected to the output end of the electric push rod (8) through a rotating member (10), the push block (9) is slidably connected to the lower portion of the support plate (15), and the push block (9) is connected to the pressing plate (28) through a pushing structure.

10. The electric wheelchair front wheel support structure according to claim 9, characterized in that: The pushing structure includes a mounting seat (13), the mounting seat (13) is slidably installed on one side of the push block (9) close to the pressing plate (28), a pushing member (12) is rotatably installed on the side of the mounting seat (13) away from the push block (9), one end of the pushing member (12) away from the mounting seat (13) is rotatably connected to the pressing plate (28), two groups of magnets (14) are fixedly installed on the lower portion of the support plate (15), the push block (9) has magnetism, and the push block (9) is attracted to the magnets (14).

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