A mobility scooter for the elderly

Abstract

The present invention discloses an electric scooter for the elderly, comprising a body, a main body compartment provided at the rear of the body, a seat mounted on the main body compartment, a shock absorber assembly provided at the rear end of the body, an adjustment assembly connected to the shock absorber assembly provided in the main body compartment, the adjustment assembly comprising a first adjustment assembly and a second adjustment assembly, the first adjustment assembly being driven by the reciprocating vibration of the shock absorber assembly to control the lifting and lowering of the seat, and the second adjustment assembly being driven synchronously to control the opening and closing of the protective element on the seat. The overall height of the seat can be automatically adjusted according to the bumpiness of the road surface. The higher the degree of bumpiness, the higher the degree of lowering of the seat, and vice versa. The seat can be restored to a normal state when leaving the bumpy road surface. At the same time, the protective element can be activated on a road surface with continuous bumps to ensure the safety of the elderly when traveling and avoid causing harm to them.

Description

Technical Field

[0001] The present invention relates to the field of mobility scooters for the elderly, and in particular to a mobility scooter for the elderly. Background Art

[0002] Mobility scooters for the elderly are low-speed electric vehicles, also known as four-wheel electric scooters. They are a means of transportation that has become popular in recent years. They are mainly aimed at elderly people who travel for leisure, picking up children, shopping, etc. However, because mobility scooters for the elderly are cheap, easy to operate and have low safety risks, they are favored by many consumers.

[0003] Although the speed is slow when driving an electric scooter, the uncertainty of road conditions and the fact that the human body's center of gravity is usually high during normal driving may cause the human body's center of gravity to become unstable during driving, resulting in the possibility of the elderly leaning back and hitting the vehicle. When the road conditions change suddenly and last for a long time, it may cause injury to the elderly, and the safety is not high. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a mobility scooter for the elderly that can effectively solve the problems existing in the above-mentioned traditional mobility scooters for the elderly.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a mobility scooter for the elderly, comprising a body, a main body compartment provided at the rear of the body, a seat installed on the main body compartment, a shock absorber assembly provided at the rear end of the body, an adjustment assembly connected to the shock absorber assembly provided in the main body compartment, the adjustment assembly comprising a first adjustment assembly and a second adjustment assembly, the first adjustment assembly being driven by the reciprocating vibration of the shock absorber assembly to control the height of the seat, and the second adjustment assembly being synchronously driven to control the opening and closing of the protective part on the seat.

[0006] In the above technical solution, further, the shock absorber assembly includes a shock absorber rod, and the first adjustment assembly and the second adjustment assembly are respectively provided on both sides of the shock absorber rod. The first adjustment assembly includes a first adjustment rod that moves synchronously with the shock absorber rod, a protrusion is provided on the side surface of the end of the first adjustment rod, and a movable cylinder is provided on one side of the first adjustment rod. The movable cylinder includes an inner cylinder and an outer cylinder, and the inner wall of the inner cylinder is provided with a curved groove. The first adjustment rod extends into the inner cylinder and cooperates with the curved groove to rotate the inner cylinder. A pull rope is provided on the outer wall of the outer cylinder and a ball is provided at the end of the pull rope. A one-way bearing is provided between the inner cylinder and the outer cylinder. The one-way bearing allows the outer cylinder to rotate when the first adjustment rod enters the inner cylinder, and does not cause the outer cylinder to rotate in the opposite direction when the first adjustment rod exits the inner cylinder. An arc plate convex toward the ball is provided on one side of the ball. The arc plate is fixed to the slider of the sliding rheostat. A damper is provided below the arc plate. One end of the sliding rheostat is connected to the first power supply, and the other end is connected to the motor at the bottom of the seat.

[0007] In the above technical solution, further, the second adjustment assembly includes a second adjustment rod that moves synchronously with the shock absorber rod, the second adjustment rod is embedded in the control compartment, a sealing block is provided on the second adjustment rod, a one-way valve is provided in the middle of the control compartment, and the one-way valve has a first cavity and a second cavity on the left and right sides respectively, a first outlet and a second outlet are provided in the first cavity, a first spring is provided in the side wall of the second cavity and away from one end of the one-way valve, a slider is fixed to the end of the first spring, a third outlet is provided between the slider and the one-way valve and located on the second cavity, a fourth outlet is provided at the middle of the first spring and located on the second cavity, the fourth outlet is connected to the liquid storage tank, a sealing plate is provided in the liquid storage tank, and the third cavity and the fourth cavity are provided on the upper and lower sides of the sealing plate respectively, first fixing blocks are provided on both sides of the inner wall of the third cavity, a second spring connected to the sealing plate is provided below the first fixing block, second fixing blocks are provided on both sides of the inner wall of the fourth cavity, the stored liquid is provided below the second fixing block, and the liquid storage tank is connected to the protective member at the back of the seat through a water pipe.

[0008] In the above technical solution, further, a fifth outlet is provided between the fourth outlet and the third cavity, and switch valves are provided at the third outlet and the fifth outlet, and the switch valves are connected to the vibration sensor.

[0009] In the above technical solution, further, a switch is provided on the upper surface of the second fixed block, and an adjustment block passing through the third outlet and the fourth outlet is provided, and a first through hole and a second through hole are provided on the adjustment block. A fixed block is provided on the left side of the adjustment block and the fixed block and the adjustment block are connected by a third spring, a magnet is provided on the right side of the adjustment block, and an electromagnet is provided on one side of the magnet, and the electromagnet is connected to the second power supply. After the sealing plate moves downward and contacts the second fixed block, the switch is pressed to start the second power supply through the switch.

[0010] In the above technical solution, further, a U-shaped rod is provided on the second adjusting rod, a metal rod is provided at the end of the U-shaped rod, a U-shaped magnet is provided on one side of the metal rod, and an electric wire connected to the first power supply and the second power supply is provided on the metal rod.

[0011] The beneficial effects of the present invention are: it can automatically adjust the overall height of the seat according to the bumpiness of the road surface. The higher the bumpiness, the higher the degree of lowering the seat, and vice versa. It can also return to a normal state when leaving the bumpy road surface. At the same time, the protective parts can also be activated on the road surface with continuous bumps to ensure the safety of the elderly when traveling and avoid causing them harm. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and examples.

[0013] Figure 1 It is a front view of the present invention.

[0014] Figure 2 This is a diagram showing the coordination of the shock absorbing assembly and the adjusting assembly of the present invention.

[0015] Figure 3 It is a structural diagram of the first adjustment component and the second adjustment component in the initial state of the present invention.

[0016] Figure 4 This is a structural diagram of the first adjustment component and the second adjustment component in the normal driving state of the present invention.

[0017] Figure 5 This is a structural diagram of the first adjustment component and the second adjustment component of the present invention when the degree of bumpiness is small.

[0018] Figure 6 This is a structural diagram of the first adjustment component and the second adjustment component of the present invention when the degree of bumpiness is large.

[0019] Figure 7 This is a structural diagram of the first adjustment component and the second adjustment component of the present invention in a locked state with a large and continuous degree of bumpiness.

[0020] In the figure, 1. frame, 2. main body, 3. seat, 4. shock absorber rod, 5. first adjustment rod, 6. bump, 7. inner tube, 8. outer tube, 9. curved groove, 10. pull rope, 11. sphere, 12. one-way bearing, 13. arc plate, 14. sliding rheostat, 15. slide, 16. damper, 17. first power supply, 18. motor, 19. second adjustment rod, 20. sealing block, 21. one-way valve, 22. first cavity, 23. second cavity, 24. first outlet, 25. second outlet, 26. first spring, 27. slider, 28. third outlet, 29. Fourth outlet, 30. Liquid storage tank, 31. Sealing plate, 32. Third cavity, 33. Fourth cavity, 34. First fixed block, 35. Second spring, 36. Second fixed block, 37. Water pipe, 38. Protective piece, 39. Fifth outlet, 40. Switch valve, 41. Vibration sensor, 42. Switch, 43. Adjustment block, 44. First through hole, 45. Second through hole, 46. Fixed block, 47. Third spring, 48. Magnet, 49. Electromagnet, 50. Second power supply, 51. U-shaped rod, 52. Metal rod, 53. U-shaped magnet, 54. Wire. DETAILED DESCRIPTION

[0021] Reference Figure 1-7 As shown, a mobility scooter for the elderly includes a body 1, a main body compartment 2 is provided at the rear of the body 1, a seat 3 is installed on the main body compartment 2, a shock absorber assembly is provided at the rear end of the body 1, an adjustment assembly connected to the shock absorber assembly is provided in the main body compartment 2, and the adjustment assembly includes a first adjustment assembly and a second adjustment assembly, the first adjustment assembly is driven by the reciprocating vibration of the shock absorber assembly to control the height of the seat 3, and the second adjustment assembly is synchronously driven to control the opening and closing of the protective part 38 on the seat 3.

[0022] Among them, such as Figure 2 As shown, the shock absorber assembly is a conventional automobile shock absorber, including a shock absorber rod 4, and the first adjustment assembly and the second adjustment assembly are arranged on both sides of the shock absorber rod 4. During driving, the shock absorber rod 4 will move back and forth, and the shock absorber rod 4 drives the first adjustment assembly and the second adjustment assembly to work.

[0023] like Figure 3-7As shown, the first adjustment component includes a first adjustment rod 5 fixed on the shock absorber rod 4, a circular protrusion 6 is provided at the end of the first adjustment rod 5, and a movable cylinder is provided on one side of the first adjustment rod 5, and a certain distance is provided between the first adjustment rod 5 and the movable cylinder. When in normal driving, the first adjustment rod 5 will not initially cooperate with the movable cylinder when following the shock absorber rod 4 to move back and forth, and will not control the lifting and lowering of the seat 3 through the second adjustment component. The movable cylinder includes an inner cylinder 7 and an outer cylinder 8, and a continuous curved groove 9 is provided on the inner wall of the inner cylinder 7. A one-way bearing 12 is provided between the inner cylinder 7 and the outer cylinder 8, and is on the outer cylinder 8 and away from the A pull rope 10 is provided at one end of the first adjusting rod 5 and a ball 11 is provided at the end of the pull rope 10. Several groups of the ball 11 and the pull rope 10 are provided on the outer cylinder 8. In the initial state, the ball 11 is attached to the outer wall of the outer cylinder 8. In order to fix the outer cylinder 8, a plain bearing is also provided on the outer wall of the outer cylinder 8. When the first adjusting rod 5 moves toward the direction of the outer cylinder 8, the inner cylinder 7 is rotated forwardly through the curved groove 9. At this time, the inner cylinder 7 and the outer cylinder 8 are in a locked state through the one-way bearing 12. The inner cylinder 7 drives the outer cylinder 8 to rotate synchronously. The angle formed by the ball 11 and the outer cylinder 8 through the pull rope 10 becomes larger. When the first adjusting rod 5 is moved from the When the inner cylinder 7 is withdrawn, the inner cylinder 7 and the outer cylinder 8 are in an active state through the one-way bearing 12. The rotation of the inner cylinder 7 will not drive the outer cylinder 8 to rotate in the opposite direction. Under the action of inertia, when the first adjusting rod 5 is separated from the inner cylinder 7, the ball 11 on the outer cylinder 8 will still keep rotating. An arc plate 13 convex to the direction of the ball 11 is provided on one side of the ball 11. When the ball 11 rotates with the outer cylinder 8, it contacts the arc plate 13 to move the arc plate 13 away from the ball 11. One end of the arc plate 13 is slidably provided on a slide plate, and the other end is fixed on the slide 15 of the sliding rheostat 14. At the same time, in order to ensure that the arc plate 13 Recovery, a damper 16 is provided under the arc plate 13. At the same time, the recovery speed of the arc plate 13 can also be slowed down by the damper 16. One end of the sliding rheostat 14 is connected to the first power supply 17, and the other end is connected to the motor 18 at the bottom of the seat 3. The sliding rheostat 14 controls the current input to the motor 18, and controls the extension length of the motor 18 rod on the motor 18 according to the magnitude of the current. Initially, the resistance value on the sliding rheostat 14 is the smallest. At this time, the extension length of the motor 18 rod of the motor 18 is the longest. When the road surface is more shaken, the resistance value output by the sliding rheostat 14 is larger, and the extension length of the motor 18 rod of the motor 18 is shorter.

[0024] When the driving speed is the same, the more shaky the road condition is, the faster the reciprocating speed of the shock absorber rod 4 is, so that the frequency of the first adjusting rod 5 entering and exiting the movable cylinder is higher. At this time, the faster the rotation speed of the outer cylinder 8 is, the closer the angle formed by the sphere 11 on the pull rope 10 and the outer cylinder 8 is to a right angle, the farther the arc plate 13 is away from the sphere 11, and the greater the resistance value output by the sliding rheostat 14.

[0025] The second adjusting component includes a second adjusting rod 19 that moves synchronously with the shock absorber rod 4, and a sealing block 20 is provided at the end of the second adjusting rod 19. The second adjusting rod 19 is embedded in the control compartment, and a one-way valve 21 is provided in the middle of the control compartment. The left and right sides of the one-way valve 21 are respectively a first cavity 22 and a second cavity 23. The first cavity 22 is the space between the sealing block 20 and the one-way valve 21. A first spring 26 is provided on the side wall in the second cavity 23 and away from the one-way valve 21. A slider 27 is provided at the end of the first spring 26. The slider 27 also has a sealing effect within a certain distance of the initial position. The slider 27 moves parallel to the second cavity 23, and a first outlet 24 and a second outlet 25 are respectively provided in the first cavity 22, wherein the first outlet 24 is close to the sealing block 20. A third outlet 28 is provided in the second cavity 23 and in the space between the slider 27 and the one-way valve 21. A fourth outlet 29 is provided in the middle of the first spring 26. At the same time, it is connected to the liquid storage tank 30 through the fourth outlet 29. A sealing plate 31 is provided in the liquid storage tank 30. The upper and lower sides of the sealing plate 31 are divided into a third cavity 32 and a fourth cavity 33. First fixing blocks 34 are provided on both sides of the inner wall of the third cavity 32. A second spring 35 is provided between the bottom surface of the first fixing block 34 and the sealing plate 31. Second fixing blocks 36 are provided on both sides of the inner wall of the fourth cavity 33. The liquid level of the stored liquid is lower than the second fixing block 36 and is connected to the protective member 38 on the back of the seat 3 through a water pipe 37. The protective member 38 is an expandable flexible layer. The stored liquid is squeezed into the protective member 38 to cause it to swell.

[0026] A fifth outlet 39 is further provided between the fourth outlet 29 and the third cavity 32. In order to ensure that the opening and closing states of the third outlet 28 and the fifth outlet 39 are related to the shaking of the vehicle body 1, switch valves 40 are provided at the third outlet 28 and the fifth outlet 39, and a vibration sensor 41 is connected to the switch valve 40. During normal driving or not driving, the vibration sensor 41 is not started, and the switch valve 40 is in an open state. When the vibration sensor 41 detects that the vibration level exceeds the normal range, the vibration sensor 41 is started and controls the switch valve 40 to close.

[0027] In order to ensure that the closing state of the first outlet 24 and the second outlet 25 can be automatically controlled, an adjustment block 43 is provided at the third outlet 28 and the fourth outlet 29, which passes through the two. A first through hole 44 and a second through hole 45 are provided on the adjustment block 43. At the same time, a fixed block 46 is provided at the left end of the adjustment block 43, and a third spring 47 is provided between the fixed block 46 and the adjustment block 43. At the same time, a magnet 48 is provided at the right end of the adjustment block 43, and an electromagnet 49 is provided on the right side of the magnet 48. The electromagnet 49 is connected to the second power supply 50. A switch 42 is provided on the top surface of the second fixed block 36. As the sealing plate 31 moves downward and contacts the second fixed block 36, the switch 42 is pressed, and the second power supply 50 is started by the switch 42. The second power supply 50 controls the electromagnet 49 to be energized, thereby adsorbing the magnet 48 on the adjustment block 43.

[0028] In the initial state, the first through hole 44 is located at the first outlet 24, the first outlet 24 is open, the second through hole 45 is offset from the second outlet 25, the second outlet 25 is closed, and the second spring 35 is in a natural state.

[0029] The reciprocating movement of the shock absorbing rod 4 includes three states.

[0030] The first is a normal driving state. At this time, the distance that the shock absorber rod 4 drives the second adjusting rod 19 to move will not cause the sealing block 20 to exceed the first outlet 24. Since the first outlet 24 is in an open state, gas will not be filled into the second cavity 23, and the protective member 38 has no protective function.

[0031] The second situation is when the road surface is slightly bumpy. At this time, the shock absorber rod 4 drives the second adjustment rod 19 to move a distance exceeding the first outlet 24. The gas filled into the second chamber 23 is the amount formed by the distance exceeding the first outlet 24. The vibration sensor 41 detects that the vibration frequency exceeds the normal driving frequency. The third outlet 28 and the fifth outlet 39 are closed. The filled gas will squeeze the slider 27 to move in the direction of the first spring 26. If the bumpiness of this section of the journey is sufficient, but the distance of the bumpy road section is too short, the amount of gas filled is too small, and the distance the slider 27 moves will not exceed the fourth outlet 29. When the road returns to the normal section, the vibration sensor 41 re-detects the normal driving vibration level. At this time, the switch valve 40 is opened, and the filled gas is released. If the bumpiness of this section of the journey is sufficient and the bumpy road section is long, the gas filled into the second chamber 23 from the first chamber 22 is sufficient. The slider 27 moves a distance exceeding the fourth outlet 29, allowing the gas to The gas is able to enter the third cavity 32. When the gas is continuously filled, the sealing plate 31 pulls the second spring 35 to move toward the second fixed block 36. After the movement, the storage liquid under the second fixed block 36 is continuously squeezed into the protective member 38. When the sealing plate 31 moves onto the second fixed block 36 and squeezes the switch 42, the protective member 38 is filled with storage liquid. The switch 42 controls the second power supply 50 to start and energize the electromagnet 49. The electromagnet 49 activates the regulating The block 43 is adsorbed, and at this time the first through hole 44 falls off the first outlet 24, and the second through hole 45 moves to the second outlet 25. When the bumpy journey continues, the squeezed air will flow out from the second outlet 25 and will not enter the second cavity 23 again. If the normal driving state is restored at this time, the third outlet 28 and the fifth outlet 39 are opened to release the gas filled in the second cavity 23, so that the sealing plate 31 and the protective member 38 as well as the slider 27 and the first spring 26 are restored to their original state.

[0032] The third is the state where the road surface is highly bumpy. At this time, due to the increase in the reciprocating frequency and the single extrusion gas volume of the second adjusting rod 19, the effect is consistent with the second case. When the distance is short, the protective member 38 cannot be filled with the storage liquid. It is only possible when the distance is long. However, in a long-distance highly bumpy road section, the speed of filling the storage liquid in the protective member 38 becomes faster than that in a long-distance low-bump road section, so the protection speed is faster. When returning to normal driving, it is the same as the second case.

[0033] Furthermore, in order to ensure the continuity of the first power supply 17 and the second power supply 50, a U-shaped rod is provided on the second adjusting rod 19, and a metal rod 52 is provided at the end of the U-shaped rod. A U-shaped magnet 53 is provided on one side of the metal rod 52, and an electric wire 54 connected to the first power supply 17 and the second power supply 50 is provided on the metal rod 52. Whether during normal driving or in low or high bumps, the reciprocating movement of the second adjusting rod 19 can transmit the generated current to the first power supply 17 and the second power supply 50 through the electric wire 54.

[0034] The working process of the present invention is as follows: During normal driving, the reciprocating movement of the first adjustment rod 5 and the second adjustment rod 19 will not affect the seat 3 and the protective member 38. When passing through a short period of low-level bumps and high-level bumps on the road, the first adjustment rod 5 can control the ball 11 on the outer tube 8 to rotate and cooperate with the arc plate 13, and control the motor 18 on the motor 18 to descend through the sliding rheostat 14. The second adjustment rod 19 can be filled with a small amount of gas but cannot fill the protective member 38 with storage liquid, and cannot be started. The protective member 38 has different reciprocating frequencies of the first adjusting rod 5 when on long-term low-level bumpy roads and long-term high-level bumpy roads. The angle formed by the sphere 11 and the outer tube 8 controlled by the long-term high-level bumpy road is larger. The lower the seat 3 is, the more consistent the effect of the second adjusting rod 19 on short-term low-level bumpy and high-level bumpy roads is. However, since the reciprocating frequency of the second adjusting rod 19 is faster on long-term high-level bumpy roads, the storage liquid in the protective member 38 is filled faster at this time, and the protection speed is faster.

[0035] The above is only one embodiment of the present invention and does not limit the present invention in any form. Simple modifications, equivalent changes or modifications made without departing from the technical solution of the present invention all fall within the scope of protection of the present invention.

Claims

1. A mobility scooter for the elderly, comprising a body, a main compartment provided at the rear of the body, and a seat installed on the main compartment, characterized in that: A shock-absorbing assembly is provided at the rear end of the vehicle body, and an adjustment assembly connected to the shock-absorbing assembly is provided in the main body compartment. The adjustment assembly includes a first adjustment assembly and a second adjustment assembly. The reciprocating vibration of the shock-absorbing assembly drives the first adjustment assembly to control the height of the seat, and the second adjustment assembly is synchronously driven to control the opening and closing of the protective member on the seat. The shock-absorbing assembly includes a shock-absorbing rod, and the first adjustment assembly and the second adjustment assembly are respectively provided on both sides of the shock-absorbing rod; The second adjustment assembly includes a second adjustment rod that moves synchronously with the shock absorber rod, the second adjustment rod is embedded in the control compartment, a sealing block is provided on the second adjustment rod, a one-way valve is provided in the middle of the control compartment, and a first cavity and a second cavity are provided on the left and right sides of the one-way valve respectively. The first cavity is provided with a first outlet and a second outlet. A first spring is provided in the side wall of the second cavity and away from one end of the one-way valve, a slider is fixed to the end of the first spring, a third outlet is provided between the slider and the one-way valve and located on the second cavity, a fourth outlet is provided at the middle of the first spring and located on the second cavity, and the fourth outlet is connected to the liquid storage tank, a sealing plate is provided in the liquid storage tank, and the third cavity and the fourth cavity are provided on the upper and lower sides of the sealing plate respectively, first fixing blocks are provided on both sides of the inner wall of the third cavity, a second spring connected to the sealing plate is provided below the first fixing block, and second fixing blocks are provided on both sides of the inner wall of the fourth cavity, the stored liquid is provided below the second fixing block, and the liquid storage tank is connected to the protective member at the back of the seat through a water pipe.

2. The mobility scooter for the elderly according to claim 1, characterized in that: The first adjusting component includes a first adjusting rod that moves synchronously with the shock absorber rod, a protrusion is provided on the side surface of the end of the first adjusting rod, and a movable cylinder is provided on one side of the first adjusting rod, and the movable cylinder includes an inner cylinder and an outer cylinder, and the inner wall of the inner cylinder is provided with a curved groove, the first adjusting rod extends into the inner cylinder and cooperates with the curved groove to cause the inner cylinder to rotate, a pull rope is provided on the outer wall of the outer cylinder and a ball is provided at the end of the pull rope, and a one-way bearing is provided between the inner cylinder and the outer cylinder, and the one-way bearing allows the outer cylinder to rotate when the first adjusting rod enters the inner cylinder, and when the first adjusting rod exits the inner cylinder, the outer cylinder will not rotate in the opposite direction, and an arc plate convex toward the direction of the ball is provided on one side of the ball, and the arc plate is fixed on the slider of the sliding rheostat, and a damper is provided under the arc plate, one end of the sliding rheostat is connected to the first power supply, and the other end is connected to the motor at the bottom of the seat.

3. The mobility scooter for the elderly according to claim 1, characterized in that: A fifth outlet is further provided between the fourth outlet and the third cavity. Switch valves are provided at the third outlet and the fifth outlet. The switch valves are connected to the vibration sensor.

4. The mobility scooter for the elderly according to claim 2, characterized in that: A switch is provided on the upper surface of the second fixed block, and an adjustment block is provided at the third outlet and the fourth outlet to pass through the two. A first through hole and a second through hole are provided on the adjustment block. A fixed block is provided on the left side of the adjustment block and the fixed block and the adjustment block are connected by a third spring. A magnet is provided on the right side of the adjustment block, and an electromagnet is provided on one side of the magnet. The electromagnet is connected to the second power supply. After the sealing plate moves downward and contacts the second fixed block, the switch is pressed to start the second power supply through the switch.

5. The mobility scooter for the elderly according to claim 4, characterized in that: A U-shaped rod is provided on the second adjustment rod, a metal rod is provided at the end of the U-shaped rod, a U-shaped magnet is provided on one side of the metal rod, and wires connected to the first power supply and the second power supply are provided on the metal rod.

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