Shock absorption system and wheelbarrow

Abstract

The present invention discloses a shock absorbing system and a wheelbarrow, wherein the shock absorbing system comprises an outer cylinder, the outer portion of which has a first fixed part, and the inner portion of which has an active cavity penetrating the upper and lower ends of the outer cylinder; a movable part, which extends into the active cavity and has its lower end extending out of the lower end of the outer cylinder; the lower end of the movable part has a fourth fixed part; a buffer reset unit, which acts between the outer cylinder and the movable part and extends into the active cavity; when the movable part moves downward, the buffer reset unit is pressurized to store energy, and when resetting, the buffer reset unit drives the movable part to move upward relative to the outer cylinder. In this way, the shock absorbing system structure is more stable, does not require additional auxiliary accessories, has lower cost, and has more stable shock absorption. At the same time, the production and assembly process are simpler.

Description

Technical Field

[0001] The invention relates to the technology of wheelbarrow field, in particular to a shock absorbing system and a wheelbarrow. Background Art

[0002] Currently, unicycles are widely favored by young people. The vehicle itself has the ability to automatically balance. It usually uses a built-in precision solid-state gyroscope to determine the posture of the vehicle body. After the precise and high-speed central microprocessor calculates the appropriate instructions, it drives the motor to achieve the balance effect. However, when the unicycle is driving on the road, the uneven road surface affects the comfort of the driver during driving and may even affect safety.

[0003] In the prior art, for example, CN 115180056 A discloses a tiltable electric balancing vehicle, comprising two symmetrically arranged vehicle bodies, the tops of the two vehicle bodies being connected by a soft belt, each vehicle body comprising a frame assembly, a wheel assembly and a pedal, the two sides of the frame assembly being respectively connected to the pedal and the wheel assembly, the inner side of the frame assembly being connected to the motor stator shaft of the wheel assembly, and the outer side of the frame assembly being connected to the pedal; a connecting shaft is provided at the bottom of the frame assembly in one vehicle body, the connecting shaft is parallel to the motor stator shaft in the corresponding wheel assembly, one end of the connecting shaft is fixedly connected to the inner side of the frame assembly, the other end of the connecting shaft is connected to a driving connecting rod, one end of the driving connecting rod is rotatably connected to the motor stator shaft in the other wheel assembly, and the other end of the driving connecting rod is rotatably connected to the connecting shaft bypassing the two wheel assemblies. The shock absorber includes an inner tube, an outer tube and a spring. A connecting base is provided at one end of the inner tube, a connecting top seat is provided at the other end of the inner tube, the outer tube is sleeved on the inner tube, a blocking ring is provided on the outer ring of the outer tube, a spring is provided between the blocking ring and the connecting top seat, a damping component is provided in the outer tube, the damping component is sleeved on the inner tube, the connecting top is fixedly connected to the top of the frame assembly, the connecting base is fixedly connected to the pedal, and the motor stator shaft of the wheel assembly is connected to the outer tube through the connecting seat. In actual use, the shock absorption stability is not ideal, and the spring is exposed, which is easy to hide dirt and affects the buffering performance of the spring. In order to shield the spring, a cover is also required to be provided on the outside of the shock absorber, which makes the structure more complicated.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims to solve the deficiencies in the prior art, and its main purpose is to provide a shock absorbing system and a unicycle, wherein the shock absorbing system has a more stable structure, does not require additional auxiliary accessories, has a lower cost, and has a smoother shock absorption. At the same time, the production and assembly processes are simpler.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A shock absorbing system, comprising:

[0008] An outer cylinder, the outer portion of which has a first fixing portion, and the inner portion of which has a movable cavity penetrating the upper and lower ends of the outer cylinder;

[0009] A movable member, which extends into the movable cavity and has a lower end extending out of the lower end of the outer tube; the lower end of the movable member has a fourth fixing portion;

[0010] The buffer reset unit acts between the outer cylinder and the movable part and extends into the movable cavity; when the movable part moves downward, the buffer reset unit is pressurized to store energy, and when resetting, the buffer reset unit drives the movable part to move upward relative to the outer cylinder.

[0011] As a preferred solution, the upper end of the movable member extends out of the upper end of the outer tube, and the upper end of the movable member has a third fixing portion.

[0012] As a preferred solution, the buffer reset unit includes a pressure spring, and the upper and lower ends of the pressure spring act on the outer cylinder and the movable part respectively.

[0013] As a preferred solution, the fourth fixing portion is fixedly connected to the lower end of the movable member, the upper end of the fourth fixing portion is connected to a buffer pad, and the upper end of the buffer pad has a buffering surface arranged toward the lower end of the outer tube.

[0014] As a preferred solution, the buffer reset unit further includes a damper, the upper end of the damper is connected to the movable part, and the lower end of the damper acts on the outer cylinder.

[0015] As a preferred solution, the damper is inserted into the interior of the movable part, and the upper end of the damper is fixed to the locking part at the upper end of the movable part, and the locking part has a first internal threaded portion and a first external threaded portion, and the first internal threaded portion and the second external threaded portion at the upper end of the damper are threadedly connected. The first external threaded portion and the second internal threaded portion at the upper end of the movable part are threadedly connected.

[0016] As a preferred embodiment, the lower end of the damper is connected with a connecting piece and a fixed limit block, the fixed limit block includes a fixing portion and a limiting portion, the fixing portion is fixed to the outer cylinder, a slide groove is provided on the movable part, the limiting portion passes downward through the slide groove to extend into the interior of the movable part, a through hole is provided on the limiting part, and the connecting piece passes through the through hole to form a connection with the lower end of the damper.

[0017] As a preferred solution, the buffer reset unit includes a gas spring, and the gas spring acts between the outer tube and the movable part respectively, and the upper end of the gas spring extends out of the upper end of the outer tube.

[0018] As a preferred embodiment, the inner side surface of the movable cavity is provided with a lower step surface, and the outer side surface of the movable part is provided with an upper step surface, the upper step surface is located above the lower step surface, and the upper and lower ends of the pressure spring act on the upper step surface and the lower step surface respectively.

[0019] As a preferred solution, the gas spring is a gas spring with a damper, and the upper end of the damper is connected to the upper end of the movable part.

[0020] A wheelbarrow comprising wheels, a movable frame, pedals and a shock absorbing system, wherein the shock absorbing system is any of the above-mentioned shock absorbing systems;

[0021] The first fixing portion of the outer cylinder is connected to the motor shaft of the wheel, the upper end of the movable member is connected to the upper end of the movable frame, and the lower end of the movable frame and the pedal are respectively connected to the fourth fixing portion of the movable member.

[0022] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it is mainly through the structural design of the shock absorbing system, specifically refers to the structural design of the outer cylinder, the movable part, and the buffer reset unit, so that the shock absorbing system structure is more stable, does not require additional auxiliary accessories, and has lower costs. Its outer cylinder has a first fixing part and a second fixing part, and its movable part has a third fixing part and a fourth fixing part. After the shock absorbing system is installed, the four fixing parts are connected and positioned, and the entire movable frame is then moved up and down together, with better integration, no shaking, and smoother shock absorption. At the same time, the production and assembly process are simpler.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional diagram of a unicycle according to the first embodiment of the present invention;

[0025] Figure 2 It is a partial assembly structure diagram of a wheelbarrow according to the first embodiment of the present invention;

[0026] Figure 3 is a partially exploded view of a wheelbarrow according to the first embodiment of the present invention;

[0027] Figure 4 is a cross-sectional view of a shock absorbing system according to a first embodiment of the present invention;

[0028] Figure 5 is an exploded view of a shock absorbing system according to a first embodiment of the present invention;

[0029] Figure 6 is a cross-sectional view of an outer cylinder of a shock absorbing system according to a first embodiment of the present invention;

[0030] Figure 7 is a perspective view of a fourth fixing portion of the shock absorbing system of the first embodiment of the present invention;

[0031] Figure 8 is a three-dimensional view from another angle of the fourth fixing portion of the shock absorbing system of the first embodiment of the present invention;

[0032] Fig. 9 is a cross-sectional view of a shock absorbing system according to a second embodiment of the present invention;

[0033] Fig.10 is an exploded view of a shock absorbing system according to a second embodiment of the present invention;

[0034] Fig.11 is a partial exploded view of a shock absorbing system according to a second embodiment of the present invention;

[0035] Fig.12 is a cross-sectional view of a shock absorbing system according to a third embodiment of the present invention;

[0036] Fig.13 is an exploded view of a shock absorbing system according to a third embodiment of the present invention;

[0037] Fig.14 is a cross-sectional view of a shock absorbing system according to a fourth embodiment of the present invention;

[0038] Fig.15 It is an exploded view of the shock absorbing system of the fourth embodiment of the present invention.

[0039] Description of the accompanying drawings: shock absorption system 100, outer cylinder 1, movable part 2, buffer reset unit 3, motor shaft 4, first fixing part 5, synchronous beam 6, second fixing part 7, movable cavity 8 upper oil seal 9, lower oil seal 10, upper bushing 11, upper sealing ring 12, lower bushing 13, lower sealing ring 14, movable frame 15, third fixing part 16, fourth fixing part 17, buffer pad 18, fixed shaft 19, first fixing hole 20, second fixing hole 21, third fixing hole 22, The fourth fixing hole 23, the axial hole 24, the pedal 25, the fifth fixing hole 26, the battery connecting plate 27, the pressure spring 28, the lower step surface 29, the upper step surface 30, the wheel 31, the damper 32, the locking piece 33, the first internal threaded portion 34, the first and external threaded portions 35, the second external threaded portion 36, the second internal threaded portion 37, the connecting piece 38, the fixed limit block 39, the fixing portion 40, the limit portion 41, the slide groove 42, the through hole 43, the gas spring 44, and the damper 45. DETAILED DESCRIPTION

[0040] Please refer to Figures 1 to 15 As shown, it shows the specific structure of various embodiments of the present invention.

[0041] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0042] like Figures 1 to 8 As shown, it shows the specific structure of the unicycle and its shock absorbing system of the first embodiment of the present invention. This shock absorbing system is not limited to the application on the unicycle, but can also be applied to other types of vehicles, for example:

[0043] A shock absorbing system 100 includes an outer cylinder 1, a movable part 2, and a buffer reset unit 3.

[0044] The outer cylinder 1 has a first fixing portion 5 for connecting the motor shaft 4 and a second fixing portion 7 for connecting the synchronous beam 6 on the outside, and has an active cavity 8 that passes through the upper and lower ends of the outer cylinder 1. The upper and lower ends of the active cavity 8 are respectively provided with an upper oil seal 9 and a lower oil seal 10. Lubricating oil is provided between the outer peripheral side surface of the movable part 2 and the inner peripheral side surface of the active cavity 8. The lubricating oil is located between the upper oil seal 9 and the lower oil seal 10, so that the spring friction is reduced and the lubricity is increased. An upper bushing 11 and an upper sealing ring 12 are provided downwardly in sequence below the upper oil seal 9, and a lower bushing 13 and a lower sealing ring 14 are provided upwardly in sequence above the lower oil seal 10. The upper sealing ring 12 and the lower sealing ring 14 can both be O-rings, and the number of the upper sealing rings 12 and 14 can be one, two or more.

[0045] The movable member 2 is a cylindrical structure, also called an inner tube, which extends into the movable cavity 8 and its upper and lower ends extend out of the upper and lower ends of the outer tube 1 respectively; the upper and lower ends of the movable member 2 are respectively provided with a third fixing portion 16 and a fourth fixing portion 17 for connecting to the movable frame 15; the third fixing portion 16 can be fixed to the upper end of the movable member 2 in the form of a clamp, and then connected to the upper end of the movable frame 15 by the third fixing portion 16. The fourth fixing portion 17 is fixedly connected to the lower end of the movable member 2, and a buffer pad 18 is connected to the upper end of the fourth fixing portion 17, and the upper end of the buffer pad 18 has a buffering surface arranged toward the lower end of the outer tube 1. In this embodiment, the buffer pad 18 is fixedly connected to the fourth fixing part 17, and plays the role of the buffer pad 18 to prevent the fourth fixing part 17 from colliding with the lower end of the outer tube 1 when resetting. At the same time, the spring generally has a certain preload force (i.e., it is compressed a little), and the buffer pad 18 also plays the role of keeping the spring early warning; the connection form of the fourth fixing part 17 at the lower end of the movable part 2 is not limited, for example: the fourth fixing part 17 can be fixed to the lower end of the movable part 2 in a clamping manner, and then the transversely extending fixed shaft 19 is used to pass through the first fixing hole 20 at the lower end of the movable part 2 and the second fixing hole 21 on the fourth fixing part 17 to achieve the connection between the fourth fixing part 17 and the movable part 2, and prevent the fourth fixing part 17 from falling off from the movable part 2 (usually, there is a gap in the clamp fixing. If there is no fixed shaft 19, the fourth fixing part 17 may fall off from the movable part 2 when the force is applied). The buffer pad 18 is provided with a third fixing hole 22 to connect and fix to the fourth fixing hole 23 at the top of the fourth fixing part 17. In addition, left and right side surfaces of the fourth fixing portion 17 are provided with axial holes 24 extending left and right for mounting a pedal 25, and a fifth fixing hole 26 extending up and down is provided at the bottom of the fourth fixing portion 17 for connecting to a battery connecting plate 27, wherein the battery connecting plate 27 is used to fix the lower side of the movable frame 15 (the battery is arranged on the movable frame 15).

[0046] The buffer reset unit 3 acts between the outer cylinder 1 and the movable part 2 and is located in the movable cavity 8; when the movable part 2 moves downward, the buffer reset unit 3 is pressurized to store energy, and when resetting, the buffer reset unit 3 drives the movable part 2 to move upward relative to the outer cylinder 1. In this embodiment, the buffer reset unit 3 includes a pressure spring 28, and the upper and lower ends of the pressure spring 28 act on the outer cylinder 1 and the movable part 2 respectively. The inner peripheral side surface of the movable cavity 8 is provided with a lower step surface 29, and the outer peripheral side surface of the movable part 2 is provided with an upper step surface 30, and the upper step surface 30 is located above the lower step surface 29, and the upper and lower ends of the pressure spring 28 act on the upper step surface 30 and the lower step surface 29 respectively.

[0047] The motion process of the shock absorbing system:

[0048] The fourth fixed part 17 is subjected to force (pulled down). Since the outer tube 1 is fixed, the fourth fixed part 17, the buffer ring and the movable part 2 are fixedly connected, which is equivalent to pulling the movable part 2. There is a pressure spring 28 between the movable part 2 and the outer tube 1. Under the action of the downward pulling force, the movable part 2 moves downward while compressing the pressure spring 28. When resetting, the pressure spring 28 drives the movable part 2 to move upward relative to the outer tube 1.

[0049] Next, a wheelbarrow is introduced, including a wheel 31, a movable frame 15, a pedal and a shock absorbing system, wherein the shock absorbing system is the shock absorbing system described above; the first fixing portion 5 of the outer cylinder 1 is connected to the motor shaft 4 of the wheel 31, the second fixing portion 7 of the outer cylinder 1 is connected to the synchronous beam 6 at the upper end of the wheel 31, the third fixing portion 16 of the movable part 2 is connected to the upper end of the movable frame 15, and the lower end of the movable frame 15 and the pedal 25 are respectively connected to the fourth fixing portion 17 of the movable part 2.

[0050] The motion process of the unicycle:

[0051] The pedal 25 is connected to the fourth fixing part 17, and the fourth fixing part 17 is fixedly connected to the buffer ring and the movable part 2. The pedal 25 is subjected to force, which is equivalent to pulling the movable part 2. The outer cylinder 1 is fixed (connected to the motor shaft 4 through a fixed block), and a pressure spring 28 is arranged between the movable part 2 and the outer cylinder 1. Under the action of the downward pulling force, the movable part 2 moves downward while compressing the pressure spring 28. When resetting, the pressure spring 28 drives the movable part 2 to move upward relative to the outer cylinder 1. Since the upper and lower ends of the movable part 2 are respectively connected to the movable frame 15 (a battery is arranged on the movable frame 15), the movable part 2 drives the movable frame 15 (and the battery) up and down at the same time during the upward and downward movement, so that the movable frame 15 moves as a whole with the shock absorbing system.

[0052] It should also be noted that the first fixing part, the second fixing part, the third fixing part, and the fourth fixing part can be integrally arranged on the corresponding outer tube and the movable part. For example, a connecting hole or a mounting surface is provided on the outer tube or the movable part as the fixing part, or additional accessories can be installed on the corresponding outer tube or the movable part as the fixing part.

[0053] like Figures 9 to 11 As shown, it shows the specific structure of the unicycle of the second embodiment of the present invention, which is basically the same as the structure of the first embodiment, and the main difference is that the buffer reset unit 3 also includes a damper 32, the upper end of the damper 32 is connected to the movable part 2, and the lower end of the damper 32 acts on the outer cylinder 1. Specifically:

[0054] The damper 32 is inserted into the interior of the movable part 2, and one end of the damper 32 is fixed to the locking member 33 at the upper end of the movable part 2. The locking member 33 includes a first internal thread portion 34 and a first external thread portion 35. The first internal thread portion 34 and the second external thread portion 36 at the upper end of the damper 32 are threadedly connected, and the first external thread portion 35 and the second internal thread portion 37 at the upper end of the movable part 2 are threadedly connected. In this way, the locking member 33 is cleverly used to fix the damper 32 and the upper end of the movable part 2.

[0055] The other end of the damper 32 is connected to a connecting piece 38 and a fixed limit block 39. The fixed limit block 39 includes a fixing portion 40 and a limit portion 41. The fixing portion 40 is fixed to the outer tube 1. A slide groove 42 is provided on the movable part 2. The limit portion 41 passes downward through the slide groove 42 to extend into the interior of the movable part 2. A through hole 43 is provided on the limit portion 41. The connecting piece 38 passes through the through hole 43 to form a connection with the other end of the damper 32.

[0056] The motion process of the shock absorbing system:

[0057] The fourth fixing part 17 is subjected to force (pulled down). Since the outer cylinder 1 is fixed, the fourth fixing part 17 is fixedly connected to the buffer pad 18 and the movable part 2, which is equivalent to pulling the movable part 2. The upper ends of the movable part 2 and the damper 32 are fixed. Under the action of the downward pulling force, the movable part 2 moves downward while compressing the spring. At the same time, the downward movement of the damper 32 is limited by the fixed limit block. Since the fixing part is fixed to the outer cylinder 1, the fixed limit block moves upward in the slide groove of the movable part 2, thereby squeezing the damper 32. When resetting, the spring drives the movable part 2 to move upward relative to the outer cylinder 1. At the same time, the fixed limit block squeezes the damper 32.

[0058] like Figure 12 to Figure 13 As shown, it shows the specific structure of the wheelbarrow of the third embodiment of the present invention, which is basically the same as the structure of the second embodiment, and the main difference is that the buffer reset unit 3 includes a gas spring 44, and the gas spring 44 acts on the outer tube 1 and the movable part 2 respectively. The upper end of the movable part 2 is threadedly connected to the gas spring. The upper end of the gas spring 44 extends out of the upper end of the movable part 2 and is exposed to the upper end of the outer tube 1. The lower end of the gas spring 44 is inserted into the interior of the movable part 2. The lower end of the gas spring 44 is connected with a connecting member 38 and a fixed stop block 39. The fixed stop block 39 includes a fixing portion 40 and a stop portion 41. The fixing portion 40 is fixed to the outer tube 1. The movable part 2 has a slide groove 42. The stop portion 41 passes through the slide groove 42 downward to extend into the interior of the movable part 2. The stop portion 41 has a through hole 43. The connecting member 38 passes through the through hole 43 to form a connection with the lower end of the gas spring 44.

[0059] like Figure 14 to Figure 15 As shown, it shows the specific structure of the unicycle of the fourth embodiment of the present invention, which is basically the same as the structure of the third embodiment, and the main difference is:

[0060] The gas spring is a gas spring with a damper, and the upper end of the damper 45 is connected to the upper end of the gas spring 44 .

[0061] The design focus of the present invention is that it is mainly through the structural design of the shock absorbing system, specifically the structural design of the outer cylinder 1, the movable part 2, and the buffer reset unit 3, so that the shock absorbing system structure is more stable, does not require additional auxiliary accessories, and has lower costs. The outer cylinder 1 has a first fixing part 5 and a second fixing part 7, and the movable part 2 has a third fixing part 16 and a fourth fixing part 17. After the shock absorbing system is installed, the four fixing parts are connected and positioned, and the entire movable frame 15 is connected and positioned together, with better integration, no shaking, and more stable shock absorption. At the same time, the production and assembly process are simpler.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A shock absorbing system, characterized in that: Included An outer cylinder, the outer portion of which has a first fixing portion, and the inner portion of which has a movable cavity penetrating the upper and lower ends of the outer cylinder; A movable member, which extends into the movable cavity and has a lower end extending out of the lower end of the outer tube; the lower end of the movable member has a fourth fixing portion; A buffer reset unit acts between the outer cylinder and the movable part and extends into the movable cavity; when the movable part moves downward, the buffer reset unit is pressurized to store energy, and when resetting, the buffer reset unit drives the movable part to move upward relative to the outer cylinder; the buffer reset unit also includes a damper, which is inserted into the interior of the movable part, the upper end of the damper is connected to the movable part, and the lower end of the damper acts on the outer cylinder.

2. A shock absorption system according to claim 1, characterized in that: The upper end of the movable member extends out of the upper end of the outer tube, and the upper end of the movable member has a third fixing portion.

3. A shock absorption system according to claim 1, characterized in that: The buffer reset unit comprises a pressure spring, and the upper and lower ends of the pressure spring act on the outer cylinder and the movable part respectively.

4. A shock absorption system according to claim 3, characterized in that: The inner circumferential side surface of the movable cavity is provided with a lower step surface, and the outer circumferential side surface of the movable part is provided with an upper step surface, the upper step surface is located above the lower step surface, and the upper and lower ends of the pressure spring act on the upper step surface and the lower step surface respectively.

5. A shock absorption system according to claim 1, characterized in that: The fourth fixing portion is fixedly connected to the lower end of the movable member, the upper end of the fourth fixing portion is connected to a buffer pad, and the upper end of the buffer pad has a buffering action surface arranged toward the lower end of the outer tube.

6. A shock absorption system according to claim 3, characterized in that: The upper end of the damper is fixed to the locking piece at the upper end of the movable part, and the locking piece has a first internal threaded portion and a first external threaded portion. The first internal threaded portion and the second external threaded portion at the upper end of the damper are threadedly connected, and the first external threaded portion and the second internal threaded portion at the upper end of the movable part are threadedly connected.

7. A shock absorption system according to claim 6, characterized in that: The lower end of the damper is connected with a connecting piece and a fixed limit block, the fixed limit block includes a fixing portion and a limit portion, the fixing portion is fixed to the outer tube, a slide groove is provided on the movable part, the limit portion passes downward through the slide groove to extend into the interior of the movable part, the limit portion is provided with a through hole, the connecting piece passes through the through hole to form a connection with the lower end of the damper.

8. A shock absorption system according to claim 1, characterized in that: The buffer reset unit includes a gas spring, which acts between the outer tube and the movable member respectively, and the upper end of the gas spring extends out of the upper end of the outer tube.

9. A shock absorption system according to claim 8, characterized in that: The gas spring is a gas spring with a damper, and the upper end of the damper is connected to the upper end of the movable part.

10. A wheelbarrow, characterized in that: The vehicle comprises wheels, a movable frame, pedals and a shock absorbing system, wherein the shock absorbing system is the shock absorbing system according to any one of claims 1 to 9; The first fixing portion of the outer cylinder is connected to the motor shaft of the wheel, the upper end of the movable member is connected to the upper end of the movable frame, and the lower end of the movable frame and the pedal are respectively connected to the fourth fixing portion of the movable member.

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