Arm mechanism

Abstract

To provide an arm mechanism which can link operation timing of an operation device with push timing of a switch, and which is insusceptible to secular change of a component and the like.SOLUTION: An arm mechanism comprises: an oscillatable first arm 110; a second arm 120 that is provided for the first arm 110; a switch 130 that is fixed to the first arm 110 and that is pushed by the second arm 120 when the second arm 120 is moved in a second direction; and a structure 150 that applies a tensile force to an operation device 180 when the second arm 120 is moved in a first direction in association with oscillation of the first arm 110.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an arm mechanism.

Background Art

[0002] Patent Document 1 discloses a brake pedal device including an arm mechanism. This brake pedal device includes a running power switching switch that switches between transmission and interruption of running power according to the depression amount of the brake pedal, and interrupts the running power with the running power switching switch in accordance with the timing when the brake pedal is depressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an arm mechanism that operates an operating device connected to an arm in accordance with the swinging of the arm, such as the above-described brake pedal device, it is conceivable that the timing of the operation of the operating device changes due to the influence of aging. For example, when the arm and the operating device are connected by a structure such as a wire, the operation timing of the operating device may shift due to the elongation of the wire. Therefore, in the example of the above-described brake device, the timing of the brake operation due to the depression of the brake pedal and the timing of the interruption of the running power by the running power switching switch may deviate from the initial setting.

[0005] An object of the present disclosure is to provide an arm mechanism that can match the timing of the operation of the operating device and the timing of the pressing of the switch and is less susceptible to aging of components and the like.

Means for Solving the Problems

[0006] One example of the arm mechanism includes a first arm (110) that can swing about a first pivot axis (101) in a first direction and a second direction opposite to the first direction, a second arm (120) provided on the first arm (110) and at least a part of which is relatively movable with respect to the first arm (110) in the first direction and the second direction, a switch (130) fixed to the first arm (110) and pressed by the second arm (120) when the second arm (120) moves relatively in the second direction with respect to the first arm (110), an elastic body (140) connecting the first arm (110) and the second arm (120) so that the second arm (120) is biased in the first direction, a structure (150) having one end connected to the second arm (120) and the other end connected to an operating device (180), and applying a tensile force to the operating device (180) when the second arm (120) moves in the first direction as the first arm (110) swings. The operating device (180) performs a predetermined operation based on the applied tensile force. When the structure (150) applies a tensile force to the operating device (180), the second arm (120) moves relatively in the second direction with respect to the first arm (110) and presses the switch (130).

[0007] In the above arm mechanism, the second arm (120) is biased in the first direction by the elastic body (140). Therefore, in the natural state (no-load state), the second arm (120) does not press the switch (130). On the other hand, when the second arm (120) moves in the first direction due to the swing of the first arm (110), a tensile force is applied to the operating device (180) by the structure (150) connected to the second arm (120). As a result, the operating device (180) performs a predetermined operation, and the second arm (120) moves relatively in the second direction with respect to the first arm (110), so that the switch (130) is pressed by the second arm (120). Therefore, it is possible to interlock the timing of the operation of the operating device (180) and the timing of pressing the switch (130). In such a configuration, even if, for example, the length of the structure (150) changes due to aging, the timings of the operation of the operating device (180) and the pressing of the switch (130) are less likely to change.

[0008] One example of the first arm (110) may have an abutting surface (164a) that restricts the movement of the second arm (120) by abutting against the second arm (120) biased in the first direction by the elastic body (140). In this configuration, the relative position of the second arm (120) with respect to the first arm (110) in the natural state can be made constant.

[0009] One example of the second arm (120) is supported by a second pivot axis (110a) provided on the first arm (110), and by swinging in the first direction and the second direction about the second pivot axis (110a), at least a part of it may move relative to the first arm (110) in the first direction and the second direction. In this configuration, the configuration of the second arm (120) that moves relative to the first arm (110) can be realized with a simple structure.

[0010] One example of the operating device 180 is a braking device, the structure (150) is a wire, and the first arm (110) may pull the wire by swinging in the first direction to operate the braking device. In this configuration, the desired switch (130) can be pressed at the timing when the braking device actually operates.

[0011] One example of the switch (130) has a function as a brake lamp switch. In this configuration, the brake lamp can be lit at the timing when the braking device operates. Also, one example of the switch (130) has a function as an unload valve switch. In this configuration, the unload valve switch can be operated at the timing when the braking device operates.

Advantages of the Invention

[0012] According to the present disclosure, it is possible to interlock the timing of the operation of the operating device and the timing of pressing the switch, and it is possible to provide an arm mechanism that is less susceptible to secular changes in components and the like.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0014] Hereinafter, as a specific example of the arm mechanism according to the present disclosure, a brake pedal device provided in a self-propelled speed sprayer will be described with reference to the drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

[0015] FIG. 1 is a perspective view of a speed sprayer equipped with an example of a brake pedal device as seen obliquely from the rear. In the following description, "front", "rear", "left", and "right" are directions based on the speed sprayer. In each drawing, an XYZ orthogonal coordinate system is shown for ease of understanding. The X-axis direction is along the front-rear direction, and the Y-axis direction is along the left-right direction. Also, the Z-axis is along the up-down direction (vertical direction).

[0016] As shown in Fig. 1, the speed sprayer 1 is rotatably provided with front wheels 3 and rear wheels 4 on the left and right sides of the traveling vehicle body, respectively. On the traveling vehicle body, a driver's seat 10, a chemical liquid tank 13, an engine room 15, a nozzle head 16, and a blower unit 17 are arranged in order from the front side to the rear side. The driver's seat 10 is a part where the driver gets in and performs driving operations such as traveling and stopping, and also operates chemical agent spraying. The chemical liquid tank 13 is a tank for storing chemical liquid for spraying. The engine room 15 houses the engine and the spraying pump. The nozzle head 16 sprays the chemical liquid pumped from the chemical liquid tank 13 by the drive of the spraying pump around. The blower unit 17 is a part for sending the air sucked from the rear to the nozzle head 16, and includes a blower fan 18 that is rotationally driven. A plurality of spray nozzles 19 are spaced apart from each other on the nozzle head 16 on the front side of the blower unit 17 so that the chemical liquid is sprayed upward and laterally.

[0017] In the speed sprayer 1, a hydrostatic continuously variable transmission (HST) that transmits the power of the engine to the traveling shafts of the wheels (front wheels 3, rear wheels 4) is equipped. The hydrostatic continuously variable transmission includes a hydraulic pump that is operated by the drive of the engine and a hydraulic motor that is driven by the flow of the hydraulic oil. In the hydrostatic continuously variable transmission, by adjusting the angle of the variable swash plate of the hydraulic pump steplessly, the direction, flow rate, etc. of the hydraulic oil flowing to the hydraulic motor are changed, and the switching between forward and reverse and the continuously variable transmission are operated.

[0018] At the foot area inside the driver's seat 10, a brake pedal device (arm mechanism) 100 for decelerating and stopping the speed sprayer 1 is provided. FIG. 2 is a perspective view showing an example of the brake pedal device 100. The brake pedal device 100 as an arm mechanism includes a first arm 110, a second arm 120, a switch 130, an elastic body 140, and a structure 150. The first arm 110 is configured to be swingable about a first rotation axis in a first direction and a second direction opposite to the first direction. The first arm 110 in the illustrated example has an arm body 111 rotatably supported by a first rotation axis 101 provided on the vehicle body frame. A pedal 112 is provided at the tip of the first arm 110 with the first rotation axis 101 side as the base end. The first rotation axis 101 extends along the Y-axis direction, that is, the left-right direction. The first arm 110 is installed in a state of being inclined toward the front side. The first arm 110 can rotate so as to fall forward (the first direction) about the first rotation axis 101. Also, the first arm 110 can rotate so as to rise backward (the second direction) about the first rotation axis 101.

[0019] FIG. 3 is a perspective view showing an example of the first arm constituting the brake pedal device. In an example of the first arm 110, the arm body 111 may be a plate-like body having the left-right direction as the thickness direction. A bracket 160 is fixed to one side surface (for example, the left side surface) 111a of the arm body 111 by, for example, bolts or the like. The bracket 160 has a first plate-like portion 161 that abuts against the side surface 111a of the arm body 111. The first plate-like portion 161 in the illustrated example has a right-angled triangular shape when viewed from the Y-axis direction. In the natural state where the pedal 112 is not depressed, one side other than the hypotenuse of the first plate-like portion 161 is arranged along the horizontal direction, and the other side other than the hypotenuse is arranged along the vertical direction.

[0020] On one side of the first plate-like portion 161, a second plate-like portion 162 that protrudes to the side opposite to the arm body 111 (i.e., the left side) is formed. At the front end of the second plate-like portion 162, a third plate-like portion 163 that protrudes upward is formed. A through-hole 163a is formed in the third plate-like portion 163. Also, on the other side of the first plate-like portion 161, a fourth plate-like portion 164 that protrudes to the left is formed. At the end of the fourth plate-like portion 164 on the side opposite to the arm body 111, a fifth plate-like portion 165 that protrudes rearward is formed. A through-hole 165a is formed in the fifth plate-like portion 165. One end of a tension coil spring 166 is connected to the through-hole 165a of the fifth plate-like portion 165 (see FIG. 2). The other end of this tension coil spring 166 is connected to the frame of the vehicle body (not shown) at a position rearward of the brake pedal. That is, the tension coil spring 166 pulls the first arm 110 rearward via the bracket 160. By being pulled by the tension coil spring 166, the first arm 110 in the natural state is stationary at a predetermined rotation position. For example, the first arm 110 pulled rearward may come into contact with a regulating member or the like provided on the vehicle frame and then stop.

[0021] At the end of the arm body 111 on the side opposite to the end where the pedal 112 is provided, a first protruding piece 113 that protrudes toward the left is formed. The first protruding piece 113 is formed so as to be substantially along the radial direction from the vicinity of the first rotation shaft 101. A through-hole 113a that penetrates the first protruding piece 113 in the thickness direction is formed in the upper portion of the first protruding piece 113. The periphery of the first protruding piece 113 where the through-hole 113a is formed faces the fourth plate-like portion 164 of the bracket 160.

[0022] FIG. 4 is a perspective view showing an example of a second arm constituting a brake pedal device. FIG. 5 is a view of the brake pedal device as seen from the Y-axis direction. The second arm 120 is supported by the first arm 110 and can swing together with the first arm 110 as the first arm 110 swings. Further, at least a part of the second arm 120 is configured to be relatively movable with respect to the first arm 110 in the forward direction (first direction) and the backward direction (second direction). The second arm 120 in the illustrated example is supported by a second rotation shaft 110a provided on the first arm 110. The second rotation shaft 110a extends along the Y-axis direction. The second arm 120 swings in the forward and backward directions about the second rotation shaft 110a, so that at least a part of the second arm 120 moves relatively in the forward and backward directions with respect to the first arm 110.

[0023] The second rotation shaft 110a in one example is constituted by a bolt-shaped member. This second rotation shaft 110a is inserted into a through hole 111b formed in the arm main body 111 of the first arm 110. The through hole 111b is provided above the first rotation shaft 101. Further, the through hole 111b is located between the fourth plate-shaped portion 164 of the bracket 160 and the first protruding piece 113 of the arm main body 111 in the circumferential direction centered on the first rotation shaft 101. Thereby, the second arm 120 is disposed between the fourth plate-shaped portion 164 and the first protruding piece 113.

[0024] The second arm 120 includes a substantially rectangular plate-shaped main body portion 121 that abuts against a side surface 111a of the arm main body 111 of the first arm 110, and a second protruding piece 123 that protrudes leftward from an edge portion on the rear side of the main body portion 121. A through hole 121a through which the second rotation shaft 110a is inserted is formed below the main body portion 121. The second protruding piece 123 is plate-shaped and can abut against the first protruding piece 113 so as to block the through hole 113a of the first protruding piece 113 when the second arm 120 swings backward relative to the first arm 110. When the second arm 120 swings forward relative to the first arm 110, the front edge portion 121c of the main body portion 121 of the second arm 120 can abut against the fourth plate-shaped portion 164. That is, the second arm 120 is configured to swing back and forth along the front-rear direction between the rear surface (contact surface) 164a of the fourth plate-shaped portion 164 and the front surface of the first protruding piece 113 in the circumferential direction centered on the second rotation shaft 110a.

[0025] A through hole 121b through which an intermediate member 170 connecting the elastic body 140 and the structure 150 is connected is formed above the main body portion 121 of the second arm 120. The intermediate member 170 has a shaft portion 171 inserted into the through hole 121b and a connection portion 173 supported by the shaft portion 171. The shaft portion 171 is, for example, in the shape of a rivet. The connection portion 173 is, for example, a metal fitting having a U shape. Through holes 173a are formed in a pair of facing side wall portions of the connection portion 173. The rivet-shaped shaft portion 171 is inserted into the through hole 121b of the second arm 120 and the through hole 173a of the connection portion 173. The second arm 120 is disposed between a pair of side wall portions of the connection portion 173. Thereby, the connection portion 173 of the intermediate member 170 is swingably supported with respect to the second arm 120 about the shaft portion 171 inserted into the through hole 121b of the second arm 120 as a rotation center.

[0026] The elastic body 140 (biasing member) connects the first arm 110 and the second arm 120 so that the second arm 120 is biased forward (the first direction). The elastic body 140 in the illustrated example is a tension coil spring. One end of the elastic body 140 is supported by a through hole 163a of a third plate-like portion 163 in a bracket 160 attached to the first arm 110. The other end of the elastic body 140 is supported by a shaft portion 171 of an intermediate member 170 connected to the second arm 120. That is, the elastic body 140 is substantially connected to the first arm 110 and the second arm 120 so that the second arm 120 swings relatively forward with respect to the first arm 110.

[0027] The structure 150 applies a tensile force to the operating device 180 when the second arm 120 moves forward as the first arm 110 swings. The operating device 180 performs a predetermined operation based on the applied tensile force. In one example, the operating device 180 is a brake device that brakes a vehicle, and the structure 150 is a wire for transmitting the operation of a brake pedal to the brake device. The brake device may be, for example, a disc brake. One end of the wire as the structure 150 is connected to the second arm 120 via the intermediate member 170. For example, one end of the wire may be attached to a connection portion 173 that constitutes the intermediate member 170. Also, the other end of the wire is connected to the brake device as the operating device 180.

[0028] The switch 130 is fixed to the first arm 110 and is pressed by the second arm 120 when the second arm 120 moves relatively backward with respect to the first arm 110. An example switch 130 includes a switch body 131 and a pressing portion 133 protruding from the switch body 131. When the pressing portion 133 of the switch 130 is pressed toward the switch body 131 side, a signal detecting that the pressing portion 133 has been pressed is output to a control device 190 connected to the switch body 131 portion.

[0029] In the illustrated example, the switch body 131 is fixed to the rear surface of the first protruding piece 113 so as to block the through hole 113a of the first protruding piece 113 in the first arm 110. Further, the pressing portion 133 is inserted into the through hole 113a of the first protruding piece 113. The tip of the pressing portion 133 passes through the through hole 113a and is located in front of the front surface of the first protruding piece 113. For example, when the second arm 120 swings relatively rearward with respect to the first arm 110 and the second protruding piece 123 of the second arm 120 abuts against the first protruding piece 113, the pressing portion 133 of the switch 130 is pressed by the second protruding piece 123. Thereby, a signal is output from the switch 130 to the control device 190.

[0030] For example, the switch 130 may have a function as a brake lamp switch. In this case, the control device 190 connected to the switch 130 may be a control device that operates a brake lamp. Further, the switch 130 may have a function as an unloading valve switch. In this case, the control device 190 connected to the switch 130 may be a control device that operates an unloading valve provided in a hydraulic circuit of a hydrostatic continuously variable transmission. When the pressing portion 133 of the switch 130 is pressed, the unloading valve unloads the hydraulic pump of the hydrostatic continuously variable transmission, thereby cutting off the output from the hydrostatic continuously variable transmission to the traveling shaft. Note that the switch 130 in this example is assumed to have both a function as a brake lamp switch and a function as an unloading valve switch.

[0031] Next, the operation of the arm mechanism will be described with reference to FIGS. 5 to 7. In FIGS. 5 to 7, for ease of understanding, the tension coil spring 166 is not drawn. As shown in FIG. 5, in the natural state where the pedal 112 is not depressed, the first arm 110 is pulled rearward by the tension coil spring 166 (see FIG. 2) and is stationary at a predetermined position. In this state, the second arm 120 is biased forward by the elastic body 140. The front edge of the main body portion 121 of the second arm 120 is in contact with the rear surface 164a of the fourth plate-like portion 164 of the bracket 160. In the state of FIG. 5, since the second protruding piece 123 of the second arm 120 is not in contact with the first protruding piece 113 of the first arm 110, the pressing portion 133 of the switch 130 is not pressed.

[0032] As shown in FIG. 6, when the driver depresses the pedal 112 during traveling, the first arm 110 swings forward about the first pivot axis 101 as the center of rotation. At this time, the bracket 160 fixed to the first arm 110 also swings forward about the first pivot axis 101 in the same manner as the first arm 110. The second arm 120 swings forward about the first pivot axis 101 without changing its relative position with respect to the first arm 110 while remaining in contact with the rear surface 164a of the fourth plate-like portion 164. As a result, the structure 150 (wire) connected to the second arm 120 via the intermediate member 170 is pulled forward, and the application of a tensile force to the operating device 180 is started.

[0033] As shown in FIG. 7, when the driver further depresses the pedal 112, the first arm 110 and the bracket 160 swing further forward about the first pivot axis 101. As a result, the intermediate member 170 connected to the second arm 120 is pulled forward by the elastic body 140, so that the structure 150 is further pulled forward, the application of a tensile force to the operating device 180 increases, and the operating device 180 executes a predetermined operation. In this example, since the operating device 180 is a braking device, the braking of the vehicle is started by the operation of the braking device. When the braking device starts to operate, even if the intermediate member 170 further pulls the structure 150 forward, the structure 150 hardly moves forward.

[0034] On the other hand, the second arm 120 pulled forward by the elastic body 140 swings backward with respect to the first arm 110 about the second pivot axis 110a by the reaction force of the tensile force applied by the structure 150 to the operating device 180. As a result, the second protruding piece 123 of the second arm 120 moves in a direction approaching the first protruding piece 113 of the first arm 110. When the second protruding piece 123 moves to a position where it contacts the first protruding piece 113, the pressing portion 133 of the switch 130 protruding forward from the through hole 113a of the first protruding piece 113 is pressed by the second protruding piece 123. As a result, based on the signal from the switch 130, the unloading valve is opened and the brake lamp is lit. Thus, in the above example, when the first arm 110 swings forward, the wire as the structure 150 is pulled forward, the braking device as the operating device 180 operates, and the second arm 120 moves relatively backward with respect to the first arm 110 and the switch 130 is pressed.

[0035] As described above, an example of an arm mechanism (brake pedal device 100) includes a first arm 110 that can swing forward (first direction) and backward (second direction) about a first pivot axis 101, a second arm 120 provided on the first arm 110 and at least a part of which is movable relative to the first arm 110 in the forward and backward directions, a switch 130 fixed to the first arm 110 and pressed by the second arm 120 when the second arm 120 moves relatively backward with respect to the first arm 110, an elastic body 140 connecting the first arm 110 and the second arm 120 so that the second arm 120 is pulled forward, a structure 150 having one end connected to the second arm 120 and the other end connected to an operating device 180, and applying a tensile force to the operating device 180 when the second arm 120 moves forward as the first arm 110 swings. The operating device 180 performs a predetermined operation based on the applied tensile force. When the structure 150 applies a tensile force to the operating device 180, the second arm 120 moves relatively backward with respect to the first arm 110 and presses the switch 130.

[0036] In the above arm mechanism, the second arm 120 is pulled forward by the elastic body 140. Therefore, in the natural state (no-load state), the second arm 120 does not press the switch 130. On the other hand, when the second arm 120 moves forward due to the swing of the first arm 110, a tensile force is applied to the operating device 180 by the structure 150 connected to the second arm 120. As a result, the operating device 180 performs a predetermined operation, and the second arm 120 moves relatively backward with respect to the first arm 110, so that the switch 130 is pressed by the second arm 120. Therefore, it is possible to interlock the timing of the operation of the operating device 180 and the timing of pressing the switch 130.

[0037] In such a configuration, even if, for example, the length of the structure 150 changes due to aging, the timing between the operation of the operating device 180 and the pressing of the switch 130 is less likely to deviate. For example, when the structure 150 extends due to aging, in order to operate the operating device 180, the driver needs to step on the pedal 112 deeper. Even in this case, the timing at which the second arm 120 swings rearward relative to the first arm 110 to press the switch 130 is when the reaction force of the tensile force applied to the operating device 180 extends the elastic body 140. Therefore, when aging occurs, even if a change occurs in the depression stroke of the first arm 110, the relationship between the operation timing of the operating device 180 and the pressing timing of the switch 130 is unlikely to change.

[0038] One example of the first arm 110 has a contact surface (rear surface 164a) that abuts against the second arm 120 that is pulled forward by the elastic body 140 to restrict the movement of the second arm 120. In this configuration, the relative position of the second arm 120 with respect to the first arm 110 in the natural state can be made constant. Therefore, it is easy to adjust the timing from when the second arm 120 starts to rotate rearward until the second arm 120 presses the switch 130.

[0039] One example of the second arm 120 is supported by a second rotation shaft 110a provided on the first arm 110, and at least a part thereof may move relatively forward and backward with respect to the first arm 110 by swinging forward and backward about the second rotation shaft 110a. In this configuration, the configuration of the second arm 120 that moves relatively with respect to the first arm 110 can be realized with a simple structure.

[0040] One example of the operating device 180 is a braking device, the structure 150 is a wire, and the first arm 110 may pull the wire by swinging forward to operate the braking device. In this configuration, the desired switch 130 can be pressed at the timing when the braking device actually operates.

[0041] One of the switches 130 functions as a brake lamp switch. In this configuration, the brake lamp can be turned on at the timing when the braking device operates. Also, one of the switches 130 functions as an unload valve switch. In this configuration, the unload valve switch can be operated at the timing when the braking device operates.

[0042] As described above, the embodiments of the present invention have been explained, but the specific forms of the present disclosure are not limited to the above examples.

[0043] For example, although an example in which the arm mechanism is applied to the speed sprayer has been shown, the arm mechanism can be applied to other agricultural work vehicles such as boom sprayers, and can also be applied to vehicles other than agricultural work vehicles.

[0044] Also, the arm mechanism may be applied not only to the braking device but also to other devices. That is, the arm mechanism may be a mechanism that presses a switch in accordance with the operation timing of an operating device in a device that operates a predetermined operating device connected to a structure such as a wire in conjunction with the swinging of the arm. In the above arm mechanism, an example in which the operation timing of the operating device and the pressing of the switch are the same has been shown, but the operation timing of the operating device and the pressing of the switch do not necessarily have to be exactly the same. For example, in the case of the braking device, the above timing can be changed by adjusting the relationship between the elastic force of the elastic body 140 and the tensile force of the wire required to operate the braking device.

Explanation of Reference Numerals

[0045] 1... Speed sprayer, 100... Brake pedal device (arm mechanism), 101... First rotation axis, 110... First arm, 120... Second arm, 130... Switch, 140... Elastic body, 150... Structure, 180... Operating device.

Claims

1. A first arm (110) that is swingable about a first rotating shaft (101) in a first direction and a second direction opposite to the first direction; A second arm (120) provided on the first arm (110), at least a part of which is movable relative to the first arm (110) in the first direction and the second direction; A switch (130) fixed to the first arm (110) and pressed by the second arm (120) when the second arm (120) moves relative to the first arm (110) in the second direction; An elastic body (140) connecting the first arm (110) and the second arm (120) so that the second arm (120) is biased in the first direction; A structure (150) having one end connected to the second arm (120) and the other end connected to an operating device (180), and applying a tensile force to the operating device (180) when the second arm (120) moves in the first direction as the first arm (110) swings. The operating device (180) performs a predetermined operation based on the application of the tensile force. The second arm (120) moves relative to the first arm (110) in the second direction and presses the switch (130) when the structure (150) applies the tensile force to the operating device (180). An arm mechanism.

2. The first arm (110) has a contact surface (164a) that abuts against the second arm (120) biased in the first direction by the elastic body (140) to restrict the movement of the second arm (120). The arm mechanism according to Claim 1.

3. The second arm (120) is supported by a second pivot axis (110a) provided on the first arm (110), and by swinging in the first direction and the second direction about the second pivot axis (110a), at least a part thereof moves relative to the first arm (110) in the first direction and the second direction. The arm mechanism according to claim 1 or 2.

4. The operating device (180) is a braking device. The structure (150) is a wire. By swinging in the first direction, the first arm (110) pulls the wire and operates the braking device. The arm mechanism according to any one of claims 1 to 3.

5. The switch (130) has a function as a brake lamp switch. The arm mechanism according to any one of claims 1 to 4.

6. The switch (130) has a function as an unloading valve switch. The arm mechanism according to any one of claims 1 to 5.

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