Fitness and riding electric tricycle for rehabilitation of old people

Abstract

The fitness riding electric tricycle comprises a front tricycle frame, a rear tricycle frame, a handle rod, a front fork wheel rod, a bottom supporting frame, a cushion, rear wheels, a damping rod, a storage battery and a universal rotating assembly, a disassembling assembly is installed between the front tricycle frame and the rear tricycle frame, a cushion supporting rod is installed on the rear tricycle frame and connected with a cushion connecting rod, and the cushion connecting rod is connected with the rear tricycle frame. A seat cushion is fixed on a seat cushion connecting rod, a locking buckle is installed on the left side of the seat cushion connecting rod, an armrest telescopic folding assembly is installed on the seat cushion connecting rod, supporting sleeves are fixed on the front side and the rear side of the bottom supporting frame, a rear wheel rotating shaft is connected in the supporting sleeves, and a rear wheel is connected with the front end and the rear end of the rear wheel rotating shaft. The bottom supporting frame is provided with a pedal flying disc, a driving motor and a variable-speed hub, a chain is connected among the pedal flying disc, the driving motor, the differential mechanism and the variable-speed hub in a sleeving mode, and the foldable electric bicycle has the advantages of being simple in structure, foldable, more convenient to adjust and use and higher in comfort and stability.

Description

Technical Field

[0001] The invention relates to the technical field of electric vehicles, and in particular to an electric tricycle for elderly people to exercise and travel. Background Art

[0002] Electric cylinder tricycles have been widely used at home and abroad as the most common means of transportation, but there are only a few that are specifically used for elderly people's transportation. Currently, the elderly's scooters are basically existing electric wheelchairs that have been modified or even left intact. The armrests, backrests, seats, etc. are fixed and cannot be adjusted. For the use of the elderly, the adjustment of these details is particularly important, and the comfort of use is closely related to the changes in these details. For example, application number CN201420669433.1 discloses a foldable three-wheeled electric vehicle for elderly people to assist walking, of which only the front and seat can be folded, simply to reduce storage space after folding. Patent number CN201120240482.X discloses a three-wheeled electric scooter for the elderly, which is the most common style on the market. All parts cannot be adjusted, and the comfort level cannot meet existing needs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an electric tricycle for elderly rehabilitation and fitness walking, which has a simple structure, is foldable, and is more convenient to adjust and use, and has higher comfort and stability.

[0004] To solve the above problems, the present invention adopts the following technical solutions:

[0005] An electric tricycle for elderly rehabilitation and fitness walking, comprising a front frame, a rear frame, a handlebar, a front fork wheel rod, a bottom support frame, a seat cushion and a rear wheel, wherein the handlebar and the front fork wheel rod are rotatably connected to the front frame, a shock absorbing rod is also installed between the bottom support frame and the rear frame, a storage battery is installed on the front frame, a universal rotation assembly is connected between the handlebar and the front fork wheel rod, a disassembly assembly is installed between the front frame and the rear frame, a seat cushion support rod is detachably installed on the rear frame, a seat cushion connecting rod is slidably connected to the seat cushion support rod, and the seat cushion is fixed The seat cushion connecting rod is fixed on the seat cushion connecting rod, and a locking buckle is also installed on the left end of the seat cushion connecting rod. An armrest telescopic and folding assembly is also installed on the seat cushion connecting rod. Support sleeves are fixed on the front and rear sides of the bottom support frame. A rear wheel shaft is rotatably connected in the support sleeve. The rear wheel is connected to the front and rear ends of the rear wheel shaft. A supporting secondary wheel assembly is also installed on the support sleeve. A differential is fixed on the rear wheel shaft. A pedal flying disc, a drive motor and a speed-changing hub are also installed on the bottom support frame, and a chain is sleeved between the pedal flying disc, the drive motor, the differential and the speed-changing hub.

[0006] A further technical solution is that the universal rotating assembly includes a rotating seat 1 fixed at the bottom end of the handle rod and a rotating seat 2 fixed at the top end of the front fork wheel rod, and an intermediate rotating block is fixed between the rotating seat 1 and the rotating seat 2. When rotation is required, the handle rod rotates to drive the rotating seat 1 to rotate, and the rotating seat 1 rotates to drive the intermediate rotating block to rotate, and the rotation of the intermediate rotating block drives the rotating seat 2 to rotate, and finally the rotating seat 2 drives the front fork wheel rod to rotate. The entire universal rotating assembly can be tilted at a certain angle, which is convenient for the elderly to use.

[0007] A further technical solution is that the armrest telescopic and folding assembly includes a fixed rod, a telescopic rod and an armrest, the armrest is rotatably connected to the telescopic rod, the telescopic rod is telescopically connected to the fixed rod left and right, and a knob is threadedly connected to the fixed rod. After the knob is threadedly connected to the fixed rod, the outer end of the knob abuts against the telescopic rod. When the left and right position of the armrest needs to be adjusted, the knob is unscrewed and the telescopic rod can be adjusted left and right on the fixed rod. After adjustment, the knob can be tightened again, and the armrest is rotatably connected to the telescopic rod, so the armrest can be folded upwards for folding.

[0008] A further technical solution is that the disassembly assembly includes a locking piece 1 welded at the rear end of the front frame, a locking piece 2 welded at the front end side of the rear frame, and a locking knob, the locking piece 1 is provided with a through hole, a limiting block is fixed on the locking piece 2, the top of the locking piece 2 is a hook-shaped structure, and a locking block is also placed at the bottom end of the locking piece 1 and the locking piece 2, and the locking knob passes through the locking piece 2 and the limiting block and is threadedly connected with the locking block. When in use, the locking piece 1 on the front frame is built into the side end of the locking piece 2. At this time, the limiting block can be inserted into the through hole for limiting, and then the locking block is used to contact the bottom ends of the locking piece 1 and the locking piece 2, and finally the locking knob is used to pass through the locking piece 2 and the limiting block and is threadedly connected with the locking block. When disassembling, unscrew the locking knob, remove the locking block, and the front frame and the rear frame can be separated.

[0009] A further technical solution is that a through groove is distributed on the locking piece 1 in the vertical direction, and when the locking knob penetrates the locking piece 2 and the limit block, the locking knob is located in the through groove on the locking piece 1.

[0010] A further technical solution is that the bottom ends of the locking piece one and the locking piece two are both inclined surfaces, and the locking block is provided with trapezoidal grooves. The bottom ends of the locking piece one and the locking piece two can be built into the trapezoidal grooves distributed on the locking block, and then the locking knob is threadedly connected to the locking block, so that the locking block can lock the locking piece one and the locking piece two, making disassembly and assembly more convenient.

[0011] A further technical solution is that the supporting secondary wheel assembly includes a secondary wheel support rod fixed on the supporting sleeve, a secondary wheel telescopic rod and a secondary wheel, the secondary wheel telescopic rod penetrates the secondary wheel support rod and can move up and down along the secondary wheel support rod, the secondary wheel is rotatably connected to the bottom end side of the secondary wheel telescopic rod, and sockets are also distributed on the secondary wheel telescopic rod, and a locking plug that can move back and forth is also placed in the secondary wheel support rod, and the secondary wheel telescopic rod can be adjusted up and down on the secondary wheel support rod. When adjusting, press the locking plug and move it outward, and the locking plug disengages from the socket on the secondary wheel telescopic rod. At this time, the secondary wheel telescopic rod can be adjusted up and down. After adjustment, release the locking plug, and reinsert the locking plug into the socket on the secondary wheel telescopic rod to lock it.

[0012] A further technical solution is that a spring is placed in the secondary wheel support rod, one end of the spring abuts against the locking plug and the other end abuts against the inner wall of the outer end of the secondary wheel support rod. When the locking plug is pressed outward, the spring is compressed, and when the locking plug is released, the spring is reset, thereby achieving a reset effect.

[0013] A further technical solution is that a vertical rod is fixed on each of the left and right sides of the rear frame, and the left and right ends of the seat cushion support rod are placed on the vertical rods on the left and right sides. Seat cushion support rod knobs are also placed on the left and right ends of the seat cushion support rod, and the seat cushion support rod knobs penetrate the seat cushion support rod and are threadedly connected with the vertical rods. When disassembling and assembling, unscrew the seat cushion support rod knobs on both sides, so that the entire seat cushion support rod together with the back cushion, armrest telescopic and folding assembly and seat cushion can be taken out together and stored separately, and can be placed in the car for easy transportation.

[0014] A further technical solution is that a back cushion is fixed to the rear end of the seat cushion connecting rod for the elderly to lean on, which is more comfortable.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention discloses an electric tricycle for elderly rehabilitation and fitness. A disassembly assembly is installed between the front frame and the rear frame. When not in use or in need of storage, the locking knob can be unscrewed for quick disassembly. After disassembly, the tricycle can be placed on the vehicle or stored separately, thereby reducing storage space and facilitating transfer.

[0017] 2. A supporting auxiliary wheel assembly is installed at the side end of the supporting sleeve. The supporting auxiliary wheel assembly can be adjusted up and down according to different road conditions to support the ground to increase the contact point and improve the stability during driving;

[0018] 3. The rear frame is equipped with a detachable seat support rod. When the vehicle needs to be transferred or stored, the entire seat support rod, seat, armrest telescopic folding assembly and back cushion can be disassembled to reduce the space required for storage and transportation;

[0019] 4. The seat cushion connecting rod can slide left and right on the seat cushion support rod and be locked and fixed with a locking buckle. The position of the seat cushion can be adjusted left and right to improve comfort;

[0020] 5. The armrest telescopic folding assembly can adjust the position of the armrest left and right, and the armrest can be folded to improve the comfort during use;

[0021] 6. The handlebar and the front fork wheel rod are connected by a universal rotating assembly. When the elderly hold the handlebar, they do not need to lean forward, which is more convenient and labor-saving, and the rotation is smooth without jamming;

[0022] 7. The pedal disc, speed hub, differential and drive motor are used. The differential can be more stable when turning. The drive motor is installed at the tail end of the bottom support frame to make rational use of space. The speed hub is connected with the pedal disc chain to achieve stable speed change. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be produced in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A three-dimensional diagram of an electric tricycle for elderly rehabilitation and fitness use according to the present invention;

[0025] Figure 2 It is a schematic diagram of a universal rotating assembly in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0026] Figure 3 It is a schematic diagram of a telescopic and folding assembly of an armrest in an electric tricycle for elderly rehabilitation and fitness travel according to the present invention;

[0027] Figure 4 It is a schematic diagram of a pedal flying disc, a speed-changing hub, a differential and a driving motor in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention, which are connected by a chain;

[0028] Figure 5 This is a schematic diagram of a seat support rod of an electric tricycle for elderly rehabilitation and fitness travel according to the present invention being detachably connected to a rear frame;

[0029] Figure 6 It is a schematic diagram of a locking buckle in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0030] Figure 7 It is a schematic diagram of a supporting secondary wheel assembly in an electric tricycle for elderly rehabilitation and fitness travel according to the present invention;

[0031] Figure 8 This is a schematic diagram of a spring built into a secondary wheel support rod in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0032] Fig. 9 It is a schematic diagram of disassembling components of an electric tricycle for elderly rehabilitation and fitness travel according to the present invention;

[0033] Fig.10 It is a schematic diagram of a limit block installed on a second locking plate in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0034] Fig.11 It is a top view of a limit block in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0035] Fig.12 It is a schematic diagram of a locking piece 1 in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0036] Fig.13 A top view of a locking block in an electric tricycle for elderly rehabilitation and fitness walking according to the present invention;

[0037] Fig.14 The invention discloses a front view of a locking block in an electric tricycle for elderly people's rehabilitation and fitness.

[0038] Figure 1-14 Middle: 1-cushion, 2-battery, 3-handle bar, 4-front frame, 5-armrest telescopic folding assembly, 6-disassembly assembly, 7-chain, 8-shock absorber rod, 9-universal rotation assembly, 10-support sleeve, 11-bottom support frame, 12-rear frame, 13-pedal frisbee, 14-pedal, 15-front fork wheel rod, 16-seat, 17-rear wheel, 18-vertical rod, 19-seat support rod knob, 20-seat support rod, 21-seat connecting rod, 22-locking buckle, 23-rear wheel shaft, 24-support secondary wheel assembly, 25-speed hub, 26-differential, 27-drive motor, 28-bearing, 51-fixed rod, 52-knob, 53-telescopic rod, 54-armrest, 61-locking plate 1, 62-locking plate 2, 63-locking block, 64-locking knob, 65-limiting block, 66-through hole, 67-through groove, 91-rotating seat 1, 92-middle rotating block, 93-rotating seat 2, 241-secondary wheel support rod, 242-secondary wheel telescopic rod, 243-jack, 244-secondary wheel, 245-locking plug, 246-spring. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0040] See also Figures 1 to 14 As shown, an electric tricycle for fitness and walking for the elderly for rehabilitation comprises a front frame 4, a rear frame 12, a handlebar 3, a front fork wheel rod 15, a bottom support frame 11, a seat 16 and a rear wheel 17. The handlebar 3 and the front fork wheel rod 15 are rotatably connected to the front frame 4, a shock absorbing rod 8 is also installed between the bottom support frame 11 and the rear frame 12, a battery 2 is installed on the front frame 4, a universal rotation assembly 9 is connected between the handlebar 3 and the front fork wheel rod 15, a disassembly assembly 6 is installed between the front frame 4 and the rear frame 12, a seat support rod 20 is detachably installed on the rear frame 12, a seat connecting rod 21 is slidably connected to the seat support rod 20, and the seat 16 is fixed. It is fixed on the seat cushion connecting rod 21, and a locking buckle 22 is also installed on the left end of the seat cushion connecting rod 21. An armrest telescopic and folding assembly 5 is also installed on the seat cushion connecting rod 21. Support sleeves 10 are fixed on the front and rear sides of the bottom support frame 11. A rear wheel shaft 23 is rotatably connected in the support sleeve 10. The rear wheel 17 is connected to the front and rear ends of the rear wheel shaft 23. A supporting secondary wheel assembly 24 is also installed on the support sleeve 10, and a differential 26 is fixed on the rear wheel shaft 23. A pedal flying disc 13, a drive motor 27 and a speed-changing hub 25 are also installed on the bottom support frame 11, and a chain 7 is sleeved between the pedal flying disc 13, the drive motor 27, the differential 26 and the speed-changing hub 25.

[0041] The universal rotating assembly 9 includes a rotating seat 1 91 fixed at the bottom end of the handlebar 3 and a rotating seat 2 93 fixed at the top end of the front fork wheel rod 15, and an intermediate rotating block 92 is fixed between the rotating seat 1 91 and the rotating seat 2 93. When rotation is required, the handlebar 3 rotates to drive the rotating seat 1 91 to rotate, and the rotating seat 1 91 rotates to drive the intermediate rotating block 92 to rotate, and the intermediate rotating block 92 rotates to drive the rotating seat 2 93 to rotate, and finally the rotating seat 2 93 drives the front fork wheel rod 15 to rotate. The entire universal rotating assembly 9 can be tilted at a certain angle, which is convenient for the elderly to use. The armrest telescopic and folding assembly 5 includes a fixed rod 51, a telescopic rod 53 and an armrest 54. The armrest 54 is rotatably connected to the telescopic rod 53. The telescopic rod 53 is telescopically connected to the fixed rod 51. A knob 52 is also threadedly connected to the fixed rod 51. After the knob 52 is threadedly connected to the fixed rod 51, its outer end abuts against the telescopic rod 53. When the left and right position of the armrest 54 needs to be adjusted, the knob 52 is unscrewed and the telescopic rod 53 can be adjusted to the left and right on the fixed rod 51. After the adjustment, the knob 52 can be tightened again. The armrest 54 is rotatably connected to the telescopic rod 53, and the armrest 54 can be folded upwards for folding. The disassembly assembly 6 includes a locking piece 1 61 welded to the rear end of the front frame 4, a locking piece 2 62 welded to the front end side of the rear frame 12, and a locking knob 64. The locking piece 1 61 is provided with a through hole 66. A limit block 65 is fixed on the locking piece 2 62. The top of the locking piece 2 62 is a hook-shaped structure. A locking block 63 is also placed at the bottom of the locking piece 1 61 and the locking piece 2 62. The locking knob 64 penetrates the locking piece 2 62 and the limit block 65 and is threadedly connected to the locking block 63. When in use, the locking piece 1 61 on the front frame 4 is built into the side end of the locking piece 2 62. At this time, the limit block 65 can be inserted into the through hole 66 to limit the position, and then the locking block 63 is used to contact the locking piece 1 61 and the bottom end of the locking piece 2 62. Finally, the locking knob 64 is passed through the locking piece 2 62 and the limit block 65 and then threadedly connected with the locking block 63. When disassembling, unscrew the locking knob 64, remove the locking block 63, and the front frame 4 and the rear frame 12 can be separated.

[0042] The locking piece 1 61 is also provided with a through groove 67 in the vertical direction. When the locking knob 64 penetrates the locking piece 2 62 and the limit block 65, the locking knob 64 is located in the through groove 67 on the locking piece 1 61. The bottom ends of the locking piece 1 61 and the locking piece 2 62 are both inclined surfaces. The locking block 63 is provided with a trapezoidal groove 66. The bottom ends of the locking piece 1 61 and the locking piece 2 62 can be built into the trapezoidal groove 66 distributed on the locking block 63, and then the locking knob 64 is threadedly connected to the locking block 63. In this way, the locking block 63 can lock the locking piece 1 61 and the locking piece 2 62, making it more convenient to disassemble and assemble.

[0043] The supporting secondary wheel assembly 24 includes a secondary wheel support rod 241, a secondary wheel telescopic rod 242 and a secondary wheel 244 fixed to the supporting sleeve 10. The secondary wheel telescopic rod 242 penetrates the secondary wheel support rod 241 and can move up and down along the secondary wheel support rod 241. The secondary wheel 244 is rotatably connected to the bottom end side of the secondary wheel telescopic rod 242. A socket 243 is also distributed on the secondary wheel telescopic rod 242. A locking plug 245 that can move back and forth is also placed in the secondary wheel support rod 241. The secondary wheel telescopic rod 242 can be adjusted up and down on the secondary wheel support rod 241. When adjusting, press the locking plug 245 to move outward, and the locking plug 245 is disengaged from the socket 243 on the secondary wheel telescopic rod 242. At this time, the secondary wheel telescopic rod 241 can be adjusted up and down. When the adjustment is completed, the locking plug 245 is released, and the locking plug 245 is reinserted into the socket 243 on the secondary wheel telescopic rod 242 to lock it. A spring 246 is also placed in the secondary wheel support rod 241, one end of the spring 246 abuts against the locking plug 245, and the other end abuts against the inner wall of the outer end of the secondary wheel support rod 241. When the locking plug 245 is pressed outward, the spring 246 is compressed, and when the locking plug 245 is released, the spring 246 is reset, and the spring 246 has a reset effect. A vertical rod 18 is fixed on the left and right sides of the rear frame 12, and the left and right ends of the seat support rod 20 are placed on the left and right vertical rods 18. The seat support rod knobs 19 are also placed on the left and right ends of the seat support rod 20. The seat support rod knobs 19 penetrate the seat support rod 20 and are threadedly connected with the vertical rod 18. When disassembling, unscrew the seat support rod knobs 19 on both sides, so that the entire seat support rod 20 together with the back cushion 1, the armrest telescopic folding assembly 5 and the seat cushion 16 can be taken out and stored separately, and can be placed in the car for convenient transportation. A back cushion 1 is also fixed to the rear end of the cushion connecting rod 21 for the elderly to lean on, which is more comfortable.

[0044] In this embodiment, when in use, the user can sit on the seat cushion 16, hold the handlebar 3 with both hands and rotate it, the handlebar 3 rotates and drives the front fork wheel rod 15 to rotate through the universal rotation assembly 9, the front fork wheel rod 15 rotates and drives the front wheel on the front fork wheel rod 15 to change the forward direction, when starting, the drive motor 27 (outer rotor motor) is started, and drives the differential 26 to rotate through the chain 7, the differential 26 is fixed on the rear wheel shaft 23, the differential 26 can start to achieve a stable anti-sway effect, the rear wheel shaft A bearing is installed between 23 and the supporting sleeve 10. Therefore, the differential 26 drives the two rear wheels 17 to rotate after rotating, and the pedal 14 is connected to the foot flying disc 13. Human power stepping on the pedal 14 can drive the foot flying disc 13 to rotate. After the foot flying disc 13 rotates, the speed-changing hub 25 is driven to rotate through the chain 7. The speed-changing hub 25 serves the purpose of speed change, and the speed-changing hub 25 is connected to the other side end of the differential 26 through the chain 7. Therefore, stepping on the pedal 14 can drive the two rear wheels 17 to move forward.

[0045] Among them, a bearing 28 is installed between the rear wheel shaft 23 and the support sleeve 10, and bearings (not shown) are also installed between the handlebar 3 and the front frame 4 and between the front fork wheel rod 15 and the front frame 4, so that the rear wheel shaft 23, the handlebar 3 and the front fork wheel rod 15 can rotate.

[0046] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention.

Claims

1. An electric tricycle for elderly rehabilitation and fitness, comprising a front frame, a rear frame, a handlebar, a front fork wheel rod, a bottom support frame, a seat cushion and a rear wheel, wherein the handlebar and the front fork wheel rod are rotatably connected to the front frame, a shock absorbing rod is further installed between the bottom support frame and the rear frame, and a battery is installed on the front frame, characterized in that: A universal rotating assembly is connected between the handlebar rod and the front fork wheel rod, and a disassembly assembly is installed between the front frame and the rear frame, and a seat cushion support rod is detachably installed on the rear frame, and a seat cushion connecting rod is slidably connected to the seat cushion support rod, and the seat cushion is fixed on the seat cushion connecting rod, and a locking buckle is also installed on the left end of the seat cushion connecting rod, and an armrest telescopic and folding assembly is also installed on the seat cushion connecting rod. A supporting sleeve is fixed on the front and rear sides of the bottom support frame, and a rear wheel rotating shaft is rotatably connected in the supporting sleeve, and the rear wheel is connected to the front and rear ends of the rear wheel rotating shaft, and a supporting secondary wheel assembly is also installed on the supporting sleeve, and a differential is fixed on the rear wheel rotating shaft, and a pedal flying disc, a driving motor and a speed-changing hub are also installed on the bottom support frame, and a chain is sleeved between the pedal flying disc, the driving motor, the differential and the speed-changing hub.

2. The electric tricycle for elderly rehabilitation according to claim 1 is characterized by: The universal rotating assembly comprises a rotating seat 1 fixed at the bottom end of the handlebar and a rotating seat 2 fixed at the top end of the front fork wheel rod, and an intermediate rotating block is fixed between the rotating seat 1 and the rotating seat 2.

3. The electric tricycle for elderly rehabilitation according to claim 1 is characterized by: The armrest telescopic and folding assembly includes a fixed rod, a telescopic rod and an armrest, the armrest is rotatably connected to the telescopic rod, the telescopic rod is telescopically connected to the fixed rod, and a knob is threadedly connected to the fixed rod. After the knob is threadedly connected to the fixed rod, the outer end of the knob abuts against the telescopic rod.

4. The electric tricycle for elderly rehabilitation according to claim 1 is characterized by: The disassembly assembly includes a locking plate 1 welded to the rear end of the front frame, a locking plate 2 welded to the front end side of the rear frame, and a locking knob. The locking plate 1 is provided with a through hole, a limiting block is fixed on the locking plate 2, the top end of the locking plate 2 is a hook-shaped structure, and locking blocks are also placed at the bottom ends of the locking plate 1 and the locking plate 2. The locking knob passes through the locking plate 2 and the limiting block and is threadedly connected to the locking block.

5. The electric tricycle for elderly rehabilitation and fitness as claimed in claim 4 is characterized by: The locking piece is also provided with through grooves in the vertical direction.

6. The electric tricycle for elderly rehabilitation and fitness according to claim 4 is characterized by: The bottom ends of the locking piece 1 and the locking piece 2 are both inclined surfaces, and the locking block is provided with trapezoidal grooves.

7. The electric tricycle for elderly rehabilitation and fitness according to claim 1 is characterized by: The supporting secondary wheel assembly includes a secondary wheel supporting rod fixed on a supporting sleeve, a secondary wheel telescopic rod and a secondary wheel, the secondary wheel telescopic rod penetrates the secondary wheel supporting rod and can move up and down along the secondary wheel supporting rod, the secondary wheel is rotatably connected to the bottom end side of the secondary wheel telescopic rod, and sockets are distributed on the secondary wheel telescopic rod, and a locking plug that can move forward and backward is placed in the secondary wheel supporting rod.

8. The electric tricycle for elderly rehabilitation and fitness as claimed in claim 7 is characterized by: A spring is also placed in the secondary wheel support rod, one end of the spring abuts against the locking plug block, and the other end of the spring abuts against the inner wall of the outer end of the secondary wheel support rod.

9. The electric tricycle for elderly rehabilitation and fitness as claimed in claim 1, characterized in that: A vertical rod is fixed on each of the left and right sides of the rear frame, and the left and right ends of the seat support rod are placed on the left and right vertical rods. Seat support rod knobs are also placed on the left and right ends of the seat support rod. The seat support rod knobs penetrate the seat support rod and are threadedly connected to the vertical rods.

10. The electric tricycle for elderly rehabilitation and fitness as claimed in claim 1, characterized in that: A back cushion is also fixed to the rear end of the seat cushion connecting rod.

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