Simple moving device

Abstract

To provide a simple moving device that makes it less likely for slipping to occur between wheels and a device, and that is capable of moving the wheels stably over slight gaps or level differences present on a moving surface.SOLUTION: A simple moving device 1 comprises: a first driving unit 11 that rotationally moves a first wheel 91 of a moving body while being pressed against the first wheel 91; a second driving unit 12 that rotationally moves a second wheel 92 of the moving body while being pressed against the second wheel 92; and a pressing unit 13 that moves the first driving unit 11 and the second driving unit 12 away from each other so as to press the first driving unit 11 toward the first wheel 91 and press the second driving unit 12 toward the second wheel 92.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a simple moving device.

Background Art

[0002] Patent Document 1 discloses a simple moving device for moving wheels on a moving surface.

[0003] This simple moving device includes two sets of front and rear drive units configured to sandwich one wheel between the two sets of front and rear drive units. Each drive unit includes a drive unit member that is rotationally driven by a motor, and a pair of grounding rollers positioned to sandwich the drive unit member from both front and rear sides. In each drive unit, in conjunction with the rotation of the drive unit member, the wheel and the pair of front and rear grounding rollers rotate in the same direction, so that the wheel moves on the moving surface.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem to be solved by the present disclosure is to provide a simple moving device that makes it difficult for slip to occur between the wheel and the device, and that can stably overcome a certain gap or step on the moving surface and move the wheel.

Means for Solving the Problems

[0006] A simple moving device according to an aspect of the present disclosure is a simple moving device that rotationally moves a first wheel and a second wheel arranged side by side in the front-rear direction on a moving body on a moving surface, and is configured to rotationally move the first wheel in a state of being in pressure contact with an outer peripheral surface of the first wheel. A first drive unit, a second drive unit configured to rotationally move the second wheel in the same direction as the first wheel in a state of being in pressure contact with an outer peripheral surface of the second wheel, and the first drive unit is pressed toward the first wheel, and the second drive unit is pressed toward the second wheel, and a pressing unit that applies a force in a direction away from each other to the first drive unit and the second drive unit.

Effects of the Invention

[0007] The present disclosure can provide a simple moving device that is less likely to cause slip between the wheels and the device, and can stably overcome even a certain amount of gaps and steps on the moving surface to move the wheels.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0009] A simple moving device according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. However, the sizes, thicknesses, and respective ratios of the components in each of the drawings of the embodiments described below do not necessarily reflect the actual dimensions.

[0010] 1. One embodiment In FIGS. 1 to 6, the whole or main part of a simple moving device 1 according to one embodiment is shown. By using the simple moving device 1 according to one embodiment, a moving body, which is an object to be moved in the present disclosure, can be moved back and forth on a moving surface S1. Specifically, by using the simple moving device 1 according to one embodiment, the first wheel 91 and the second wheel 92 arranged side by side in the front-rear direction on the moving body can be forcibly rotated on the moving surface S1 and rotated and moved back and forth.

[0011] The moving body that the simple moving device 1 according to one embodiment forcibly moves is a railway vehicle bogie. The moving surface S1 is a surface on a rail R1 extending in the front-rear direction.

[0012] The front-rear direction used in the present disclosure is the direction in which the rail R1 extends. In other words, it is the direction in which the first wheel 91 and the second wheel 92 rotate and move on the moving surface S1 of this rail R1. The left-right direction used in the text is the direction orthogonal to the front-rear direction when viewed from the up-down direction. In other words, it is the direction in which the rotation axes of the first wheel 91 and the second wheel 92 on the rail R1 extend.

[0013] As shown in FIGS. 1 and 2 etc., the simple moving device 1 according to one embodiment includes a first drive unit 11, a second drive unit 12, a pressing unit 13, a support 14, and a braking mechanism 15.

[0014] In the front-rear direction, the first drive unit 11 and the second drive unit 12 are positioned at a distance from each other, and the pressing unit 13 is positioned between the first drive unit 11 and the second drive unit 12. Below, more detailed configurations will be described.

[0015] (First drive unit) As shown in FIGS. 1 and 4, the first drive unit 11 is configured to forcibly rotate and move the first wheel 91 while being in pressure contact with the outer peripheral surface of the first wheel 91.

[0016] The first drive unit 11 includes a frame 110, a first grounding roller 21, a first drive roller 31, a power transmission mechanism 71, a guide roller 77, and a first motor 81.

[0017] The frame 110 is formed to be long in the front-rear direction. The frame 110 includes a pair of side plates 111, 112 positioned at a distance from each other in the left-right direction, and a shaft 113 connecting the both side plates 111, 112. The pair of side plates 111, 112 are each formed of a metal plate long in the front-rear direction. The shaft 113 has an axis extending in the left-right direction.

[0018] The first grounding roller 21 is rotatably supported with respect to the frame 110. The first grounding roller 21 has a grounding surface 215 that contacts the moving surface S1 on its outer periphery. The first grounding roller 21 is positioned between the pair of side plates 111, 112 in the left-right direction. The first grounding roller 21 is integrally and rotatably coupled to a support shaft 114 spanned between the pair of side plates 111, 112. The support shaft 114 has an axis extending in the left-right direction and is rotatably connected to the frame 110 via a bearing 115. The first grounding roller 21 is rotationally driven by the rotation of the first motor 81 that constitutes a part of the drive source 8 of the simple moving device 1 being transmitted.

[0019] The first drive roller 31 is rotatably supported with respect to the frame 110. The first drive roller 31 has a friction surface 315 that contacts the grounding surface 215 of the first grounding roller 21 on its outer periphery. The first drive roller 31 is arranged such that its friction surface 315 contacts a portion of the outer peripheral surface of the first wheel 91 that faces obliquely downward. The first drive roller 31 is positioned between the pair of side plates 111, 112 in the left-right direction. The first drive roller 31 is rotatably connected to a support shaft 116 spanned between the pair of side plates 111, 112 via a bearing 117.

[0020] The power transmission mechanism 71 is supported by the frame 110. The power transmission mechanism 71 is disposed on the first side in the left - right direction of the frame 110. More specifically, it is arranged on the outer side in the left - right direction of the side plate 111, which is located on the first side in the left - right direction among the pair of side plates 111 and 112. The power transmission mechanism 71 includes a sprocket 712 attached to the output shaft 815 of the first motor 81, a sprocket 713 attached to the end of the support shaft 114 that rotates integrally with the first grounding roller 21, and an endless chain 715, which is a power transmission member spanned between both sprockets 712 and 713. A cover 718 that covers them is attached to the outer side in the left - right direction of the side plate 111. Instead of the chain 715, it is also possible to span an endless belt, which is a power transmission member, between the output shaft 815 of the first motor 81 and the first grounding roller 21.

[0021] The guide roller 77 is rotatably supported with respect to the frame 110. The guide roller 77 has a concave portion 772 that curves along the flange 912 of the first wheel 91 over the entire circumference. The guide roller 77 is disposed on the second side in the left - right direction of the frame 110. More specifically, it is arranged on the outer side in the left - right direction of the side plate 112, which is located on the second side in the left - right direction among the pair of side plates 111 and 112. In the left - right direction, the guide roller 77 is located on the opposite side of the power transmission mechanism 71, sandwiching the frame 110, the first grounding roller 21, and the first drive roller 31. The guide roller 77 is rotatably connected to the support shaft 118 attached to the side plate 112 via a bearing 119.

[0022] The first motor 81 is supported by the frame 110. The first motor 81 includes a motor body 811 that converts the supplied electric power into rotational force, and an output shaft 815 that protrudes from the motor body 811 to the first side in the left - right direction and is rotationally driven by the rotational force output by the motor body 811. The motor body 811 is located on the outer side in the left - right direction of the side plate 112, and the output shaft 815 is located on the outer side in the left - right direction of the side plate 111. In the left - right direction, the motor body 811 and the output shaft 815 are located on opposite sides of each other with the frame 110 in between.

[0023] In the front-rear direction, the first drive roller 31 is located farther from the second drive unit 12 than the first grounding roller 21. Also, in the front-rear direction, the first drive roller 31 and the first grounding roller 21 are located farther from the second drive unit 12 than the first motor 81. In the front-rear direction, the first grounding roller 21 is located between the first drive roller 31 and the first motor 81.

[0024] In the vertical direction, the first drive roller 31 is located above the first grounding roller 21. That is, the first drive roller 31 is located obliquely above the first grounding roller 21. The above description regarding the relative positional relationship among the first grounding roller 21, the first drive roller 31, and the first motor 81 is based on their respective rotation axes.

[0025] (Second drive unit) As shown in FIGS. 1 and 5, the second drive unit 12 is configured to forcibly rotate and move the second wheel 92 in the same direction as the first wheel 91 while being in pressure contact with the outer peripheral surface of the second wheel 92.

[0026] The second drive unit 12 has a configuration that is symmetric with respect to the first drive unit 11 with reference to a virtual plane orthogonal to the front-rear direction. Specifically, the second drive unit 12 includes a frame 120, a second grounding roller 22, a second drive roller 32, a power transmission mechanism 72, a guide roller 78, and a second motor 82.

[0027] The frame 120 is formed long in the front-rear direction. The frame 120 includes a pair of side plates 121, 122 that are spaced apart in the left-right direction, and a shaft 123 that connects the both side plates 121, 122. The pair of side plates 121, 122 are each formed of a metal plate that is long in the front-rear direction. The shaft 123 has an axis extending in the left-right direction.

[0028] The second grounding roller 22 is rotatably supported with respect to the frame 120. The second grounding roller 22 has a grounding surface 225 that contacts the moving surface S1 on its outer periphery. The second grounding roller 22 is positioned between a pair of side plates 121 and 122 in the left-right direction. The second grounding roller 22 is integrally and rotatably coupled to a support shaft 124 spanned between the pair of side plates 121 and 122. The support shaft 124 has an axis extending in the left-right direction and is rotatably connected to the frame 120 via a bearing 125. The second grounding roller 22 is rotationally driven by the transmission of the rotation of a second motor 82 that constitutes part of the drive source 8 of the simple moving device 1.

[0029] The second drive roller 32 is rotatably supported with respect to the frame 120. The second drive roller 32 has a friction surface 325 that contacts the grounding surface 225 of the second grounding roller 22 on its outer periphery. The second drive roller 32 is arranged such that its friction surface 325 contacts a portion of the outer peripheral surface of the second wheel 92 that faces obliquely downward. The second drive roller 32 is positioned between a pair of side plates 121 and 122 in the left-right direction. The second drive roller 32 is rotatably connected to a support shaft 126 spanned between the pair of side plates 121 and 122 via a bearing 127.

[0030] The power transmission mechanism 72 is supported by the frame 120. The power transmission mechanism 72 is arranged on the first side in the left-right direction of the frame 120. More specifically, it is arranged outside the left-right direction of the side plate 121 located on the first side in the left-right direction among the pair of side plates 121 and 122. The power transmission mechanism 72 includes a sprocket 722 attached to the output shaft 825 of the second motor 82, a sprocket 723 attached to the end of the support shaft 124 that rotates integrally with the second grounding roller 22, and an endless chain 725 spanned between both sprockets 722 and 723. A cover 728 that covers these is attached outside the left-right direction of the side plate 121.

[0031] The guide roller 78 is rotatably supported with respect to the frame 120. The guide roller 78 has a recess 782 curved along the flange 922 of the second wheel 92 over the entire circumference. The guide roller 78 is disposed on the second side in the left - right direction of the frame 120. More specifically, it is disposed on the outer side in the left - right direction of the side plate 122 located on the second side in the left - right direction among the pair of side plates 121, 122. In the left - right direction, the guide roller 78 is located on the opposite side of the power transmission mechanism 72, sandwiching the frame 120, the second ground roller 22, and the second drive roller 32. The guide roller 78 is rotatably connected to a support shaft 128 attached to the side plate 122 via a bearing 129.

[0032] The second motor 82 is supported by the frame 120. The second motor 82 includes a motor body 821 that converts supplied electric power into rotational force, and an output shaft 825 that protrudes from the motor body 821 toward the first side in the left - right direction and is rotationally driven by the rotational force output from the motor body 821. The motor body 821 is located on the outer side in the left - right direction of the side plate 122, and the output shaft 825 is located on the outer side in the left - right direction of the side plate 121. In the left - right direction, the motor body 821 and the output shaft 825 are located on opposite sides of each other with the frame 120 interposed therebetween.

[0033] In the front - rear direction, the second drive roller 32 is located farther from the first drive unit 11 than the second ground roller 22. Also, in the front - rear direction, the second drive roller 32 and the second ground roller 22 are located farther from the first drive unit 11 than the second motor 82. In the front - rear direction, the second ground roller 22 is located between the second drive roller 32 and the second motor 82.

[0034] In the up - down direction, the second drive roller 32 is located above the second ground roller 22. That is, the second drive roller 32 is located obliquely above the second ground roller 22. The above description regarding the relative positional relationship of the second ground roller 22, the second drive roller 32, and the second motor 82 is based on their respective rotation axes.

[0035] (Pressing unit) The pressing unit 13 is configured to press the first drive unit 11 toward the first wheel 91 and press the second drive unit 12 toward the second wheel 92 (see the arrows in FIGS. 1 and 2). In other words, the pressing unit 13 is configured to apply a force in a direction in which the first drive unit 11 and the second drive unit 12 move away from each other in the front-rear direction.

[0036] The pressing unit 13 includes an actuator 4 and a hydraulic pump unit 5 for operating the actuator 4. The actuator 4 is composed of a first actuator 41 and a second actuator 42. The first actuator 41, the second actuator 42, and the hydraulic pump unit 5 are supported by a support 14.

[0037] The first actuator 41 is composed of a first hydraulic cylinder 410. The first hydraulic cylinder 410 is configured to move the first drive unit 11 closer to and away from the support 14 located between the first drive unit 11 and the second drive unit 12 in the front-rear direction.

[0038] The second actuator 42 is composed of a second hydraulic cylinder 420. The second hydraulic cylinder 420 is configured to move the second drive unit 12 closer to and away from the support 14 in the front-rear direction.

[0039] The first hydraulic cylinder 410 and the second hydraulic cylinder 420 are arranged linearly in the front-rear direction. The first hydraulic cylinder 410 and the second hydraulic cylinder 420 are fixed to the upper surface of the portion of the support 14 located between the first drive unit 11 and the second drive unit 12.

[0040] The hydraulic pump unit 5 is manual and includes a lever 51 that can be grasped by hand and tilted by the user, and a pump body 53 connected to the lever 51.

[0041] In the simple moving device 1 according to one embodiment, when the user operates the lever 51, hydraulic oil is discharged from the pump body 53 through the pipe 16 toward the first hydraulic cylinder 410 and the second hydraulic cylinder 420, and both the first hydraulic cylinder 410 and the second hydraulic cylinder 420 extend. As a result, the first hydraulic cylinder 410 presses the first drive unit 11 toward the first wheel 91, and the second hydraulic cylinder 420 presses the second drive unit 12 toward the second wheel 92.

[0042] (Support) The support 14 includes a frame 140 that constitutes the main body of the support 14, and a plurality of casters 142 attached to the lower surface of the frame 140.

[0043] The frame 140 is formed of a metal plate, and the first actuator 41, the second actuator 42, and the hydraulic pump unit 5 are fixed to the upper surface of the frame 140. The support 14 is movable in all directions, front, rear, left, and right, via a plurality of casters 142.

[0044] (Braking mechanism) The braking mechanism 15 is a mechanism for braking the moving body, and specifically, is configured to brake the first wheel 91 of the moving body.

[0045] The braking mechanism 15 is manual and includes a braking lever 151 that can be grasped by hand and tilted, an interlocking mechanism 152 connected to the braking lever 151, and a brake shoe 154 operated via the interlocking mechanism 152. The brake shoe 154 is a brake pad configured to press against the side surface of the first wheel 91 in the left - right direction. The braking mechanism 15 is supported by the support 14.

[0046] In the simple moving device 1 according to one embodiment, when the user rotates the braking lever 151 in a predetermined direction, the brake shoe 154 presses against the side surface of the first wheel 91, thereby restricting the movement of the moving body in the front - rear direction and braking the moving body.

[0047] Note that the braking mechanism 15 may be configured to brake the second wheel 92. In this case, the brake shoe 154 included in the braking mechanism 15 is configured to press against the left and right side surfaces of the second wheel 92.

[0048] (Other configurations) The simple moving device 1 of one embodiment further includes an operation handle 17 extending from the support 14 to the first side in the left - right direction.

[0049] In the left - right direction, the side where the operation handle 17 extends is the same as the side where the power transmission mechanism 71 is located with respect to the frame 110 in the first drive unit 11 and the same as the side where the power transmission mechanism 72 is located with respect to the frame 120 in the second drive unit 12. Also, in the left - right direction, the side where the operation handle 17 extends is opposite to the side where the motor body 811 of the first motor 81 protrudes from the frame 110 of the first drive unit 11 and opposite to the side where the motor body 821 of the second motor 82 protrudes from the frame 120 of the second drive unit 12.

[0050] The operation handle 17 includes a first support shaft 171 and a second support shaft 172 that are arranged in the front - rear direction, and a grip shaft 173 that extends in the front - rear direction so as to connect the tip portions of the first support shaft 171 and the second support shaft 172.

[0051] The first support shaft 171 includes a portion that protrudes obliquely upward and a portion that protrudes upward from the tip of this portion. Similarly, the second support shaft 172 includes a portion that protrudes obliquely upward and a portion that protrudes upward from the tip of this portion. The grip shaft 173 is connected to the tip of the first support shaft 171 and the tip of the second support shaft 172.

[0052] In the front-rear direction, the lever 51 of the hydraulic pump unit 5 is positioned between the first support shaft 171 and the second support shaft 172 of the operation handle 17. In a state where the lever 51 is tilted, the lever 51 is held in a posture extending toward the side where the first support shaft 171 and the second support shaft 172 extend. The brake lever 151 of the braking mechanism 15 is positioned on the side opposite to the side where the lever 51 of the hydraulic pump unit 5 is located, with the second support shaft 172 of the operation handle 17 interposed therebetween.

[0053] In addition, the simple moving device 1 of one embodiment further includes a battery 18 that supplies power to the first motor 81 and the second motor 82 constituting the drive source 8, and a control panel 19 that controls the power supply to the battery 18 (see FIG. 6).

[0054] The battery 18 and the control panel 19 are detachably provided with respect to the main body portion of the simple moving device 1. Specifically, the battery 18 and the control panel 19 are each detachably provided with respect to the frame 140 of the support 14 included in the simple moving device 1.

[0055] The battery 18 includes a battery main body 181, a support frame 183 that supports the battery main body 181, and a plurality of casters 185 attached to the lower surface of the support frame 183. The support frame 183 is formed of a metal plate, and the battery main body 181 is fixed to the upper surface of the support frame 183. The battery 18 is movable in all directions of front, rear, left, and right via the plurality of casters 185. The support frame 183 is detachably fixed to the frame 140 of the support 14.

[0056] The control panel 19 includes a control panel main body 191, a support frame 193 that supports the control panel main body 191, and a plurality of casters 195 attached to the lower surface of the support frame 193. The support frame 193 is formed of a metal plate, and the control panel main body 191 is fixed to the upper surface of the support frame 193. The control panel 19 is movable in all directions of front, rear, left, and right via the plurality of casters 195. The support frame 193 is detachably fixed to the frame 140 of the support 14.

[0057] In the simple moving device 1 of one embodiment, in the front-rear direction, the side where the battery 18 is fixed to the support 14 and the side where the control panel 19 is fixed to the support 14 are opposite to each other.

[0058] (Function and effect) According to the simple moving device 1 of one embodiment, the first wheel 91 and the second wheel 92 of the moving body which is a vehicle carriage are rotated in the same direction on the moving surface S1 on the rail R1, and the moving body (that is, the vehicle carriage) or the railway vehicle equipped with the same can be moved in the front-rear direction.

[0059] Specifically, with the first wheel 91 and the second wheel 92 placed on the moving surface S1 of the rail R1, the simple moving device 1 is inserted between the first wheel 91 and the second wheel 92 from the outside in the left-right direction of the rail R1. The insertion operation can be easily performed with the user holding the gripping shaft 173 of the operation handle 17 with both hands. By inserting the simple moving device 1, the first drive unit 11 and the second drive unit 12 are arranged between the first wheel 91 and the second wheel 92.

[0060] Next, when the user operates the lever 51 of the hydraulic pump unit 5, the first hydraulic cylinder 410 and the second hydraulic cylinder 420 are respectively extended. The extended first hydraulic cylinder 410 presses the first drive roller 31 of the first drive unit 11 against the first wheel 91, and the extended second hydraulic cylinder 420 presses the second drive roller 32 of the second drive unit 12 against the second wheel 92.

[0061] After setting the simple moving device 1 as described above, for example, when operating a switch provided on the control panel 19, electric power is supplied from the battery 18 to the first motor 81 and the second motor 82 which are the drive sources 8. The first motor 81 and the second motor 82 are rotationally driven in opposite directions.

[0062] As a result, in the first drive unit 11, the first ground roller 21 and the first drive roller 31 rotate in conjunction with the rotation of the first motor 81, thereby rotating the first wheel 91 so as to move it to one side in the front-rear direction. In the second drive unit 12, the second ground roller 22 and the second drive roller 32 rotate in conjunction with the rotation of the second motor 82, thereby rotating the second wheel 92 so as to move it to the same side as the side where the first wheel 91 moves in the front-rear direction.

[0063] According to the simple moving device 1 of one embodiment, while applying an external force that presses the first drive unit 11 against the first wheel 91 and not applying an external force that presses the second drive unit 12 against the second wheel 92, the first wheel 91 and the second wheel 92 can be rotated and moved simultaneously. Therefore, there are advantages such as that it is difficult for slip to occur between the first wheel 91 and the second wheel 92 and the simple moving device 1, and that even if there are some gaps or steps on the moving surface S1, the first wheel 91 and the second wheel 92 can be rotated and moved over this stably.

[0064] 2. Modification As described above, the simple moving device of the present disclosure has been described based on the embodiments shown in the accompanying drawings, but the simple moving device of the present disclosure is not limited to the above embodiments.

[0065] For example, in the above embodiment, the first drive unit 11 includes the first ground roller 21 that is rotationally driven by the drive source 8 and the first drive roller 31 that contacts and interlocks with the first ground roller 21, and the second drive unit 12 includes the second ground roller 22 that is rotationally driven by the drive source 8 and the second drive roller 32 that contacts and interlocks with the second ground roller 22. However, the configurations of the first drive unit 11 and the second drive unit 12 are not limited to this.

[0066] For example, it is also preferable that the first drive roller 31 is directly rotationally driven by the drive source 8 instead of the first grounding roller 21 being rotationally driven by the drive source 8. Specifically, by bridging a power transmission member, which is an endless chain or belt, between the output shaft 815 of the first motor 81 and the first drive roller 31, it is possible to directly rotationally drive the first drive roller 31. In this case, the first grounding roller 21 only needs to be provided so as to be rollable on the moving surface S1 without contacting the first drive roller 31. Similarly, it is also preferable that the second drive roller 32 is directly rotationally driven by the drive source 8 instead of the second grounding roller 22 being rotationally driven by the drive source 8. Specifically, by bridging a power transmission member, which is an endless chain or belt, between the output shaft 825 of the second motor 82 and the second drive roller 32, it is possible to directly rotationally drive the second drive roller 32. In this case, the second grounding roller 22 only needs to be provided so as to be rollable on the moving surface S1 without contacting the second drive roller 32.

[0067] That is, the simple moving device 1 only needs to include a first drive unit 11 that includes a first drive roller 31 that is directly or indirectly rotationally driven by the drive source 8, and a second drive unit 12 that includes a second drive roller 32 that is directly or indirectly rotationally driven by the drive source 8.

[0068] Also, in the above embodiment, the first actuator 41 is constituted by the first hydraulic cylinder 410, but as long as it is possible to move the first drive unit 11 closer to and away from the support 14, it may be constituted by an actuator of another type.

[0069] Similarly, in the above embodiment, the second actuator 42 is constituted by the second hydraulic cylinder 420, but as long as it is possible to move the second drive unit 12 closer to and away from the support 14, it may be constituted by an actuator of another type.

[0070] In the above-described embodiment, the first actuator 41 and the second actuator 42 are configured separately, but the first actuator 41 and the second actuator 42 may be integrally configured.

[0071] The number of hydraulic cylinders forming the actuator 4 is not particularly limited, and at least one hydraulic cylinder may be used as long as it can move the first drive unit 11 closer to and farther from the support 14 and move the second drive unit 12 closer to and farther from the support 14. Therefore, it is also preferable that the pressing unit 13 includes one hydraulic cylinder, and this one hydraulic cylinder applies a force to press the first drive unit 11 against the first wheel 91 and applies a force to press the second drive unit 12 against the second wheel 92.

[0072] In the above-described embodiment, the braking mechanism 15 includes a brake shoe 154 configured to press against the side surface of the first wheel 91 or the second wheel 92, but the configuration of the braking mechanism 15 is not limited thereto. For example, it is also preferable that the braking mechanism 15 includes a brake shoe configured to press against the tread surface of the first wheel 91 or the second wheel 92.

[0073] In the above-described embodiment, the simple moving device 1 employs a method of supplying power supplied from the battery 18 to the drive source 8, but a method of supplying power of an external power source (AC power source) supplied via a power transmission system to the drive source 8 may also be employed.

[0074] Regarding other configurations of the simple moving device of the present disclosure, within the range where the same operational effects are achieved, appropriate design changes can be made, and well-known configurations can also be appropriately combined and applied. In any case, as in the above-described modification examples, they are included in the technical idea of the present disclosure.

[0075] 3. Summary As described based on the above embodiments, the simple moving device (1) of the first aspect is a simple moving device (1) that rotates the first wheel (91) and the second wheel (92) arranged side by side in the front-rear direction on a moving body on the moving surface (S1). It includes a first drive unit (11) configured to rotate the first wheel (91) in a state of being in pressure contact with the outer peripheral surface of the first wheel (91), a second drive unit (12) configured to rotate the second wheel (92) in the same direction as the first wheel (91) in a state of being in pressure contact with the outer peripheral surface of the second wheel (92), and a pressing unit (13) that applies a force in a direction away from each other to the first drive unit (11) and the second drive unit (12) so as to press the first drive unit (11) toward the first wheel (91) and press the second drive unit (12) toward the second wheel (92).

[0076] According to this aspect, while pressing the first drive unit (11) against the first wheel (91) and pressing the second drive unit (12) against the second wheel (92), the first wheel (91) and the second wheel (92) can be rotated simultaneously. Therefore, slippage is less likely to occur between the first wheel (91) and the second wheel (92) of the moving body and the simple moving device (1). In addition, even if there are some gaps or steps on the moving surface (S1), the first wheel (91) and the second wheel (92) of the moving body can be rotated stably over them.

[0077] In the simple moving device (1) of the second aspect, in the first aspect, the first drive unit (11) includes a first drive roller (31) that has a friction surface (315) contacting the outer peripheral surface of the first wheel (91) on its outer periphery and is rotationally driven by a drive source (8). The second drive unit (12) includes a second drive roller (32) that has a friction surface (325) on its outer periphery and is rotationally driven by the drive source (8).

[0078] According to this aspect, from the start time, a force for pressing the first drive roller (31) of the first drive unit (11) against the first wheel (91) can be stably applied, and a force for pressing the second drive roller (32) of the second drive unit (12) against the second wheel (92) can be stably applied. Therefore, slippage is less likely to occur between the first wheel (91) and the second wheel (92) of the moving body and the simple moving device (1). In addition, even if there are some gaps or steps on the moving surface (S1), the first wheel (91) and the second wheel (92) of the moving body can be rotationally moved over this stably.

[0079] The simple moving device (1) of the third aspect further includes a support body (14) located between the first drive unit (11) and the second drive unit (12) in the first aspect or the second aspect. The pressing unit (13) includes an actuator (4) that moves the first drive unit (11) closer to and away from the support body (14) and moves the second drive unit (12) closer to and away from the support body (14).

[0080] According to this aspect, by driving the actuator (4), the first drive unit (11) can be pressed against the first wheel (91), and the second drive unit (12) can be pressed against the second wheel (92).

[0081] The simple moving device (1) of the fourth aspect further includes a hydraulic pump unit (5) configured to extend at least one hydraulic cylinder (410, 420) forming the actuator (4) in the third aspect.

[0082] According to this aspect, by using the hydraulic pump unit (5) to extend at least one hydraulic cylinder (410, 420), the first drive unit (11) can be pressed against the first wheel (91), and the second drive unit (12) can be pressed against the second wheel (92).

[0083] The simple moving device (1) according to the fifth aspect further includes a braking mechanism (15) for braking the first wheel (91) or the second wheel (92) in any one of the first to fourth aspects. The braking mechanism (15) includes a brake shoe (154) configured to press against the side surface of the first wheel (91) or the second wheel (92).

[0084] According to this aspect, by operating the brake shoe (154) provided in the simple moving device (1) and pressing it against the side surface of the first wheel (91) or the second wheel (92), the moving body can be quickly braked.

Explanation of Signs

[0085] 1 Simple moving device 11 First drive unit 12 Second drive unit 13 Pressing unit 14 Support 15 Braking mechanism 154 Brake shoe 18 Battery 19 Control panel 21 First grounding roller 215 Grounding surface 22 Second grounding roller 225 Grounding surface 31 First drive roller 315 Friction surface 32 Second drive roller 325 Friction surface 4 Actuator 410 First hydraulic cylinder 420 Second hydraulic cylinder 5 Hydraulic pump unit 8 Drive source 91 First wheel 92 Second wheel S1 Moving surface

Claims

1. A simple moving device that rotates a first wheel and a second wheel arranged side by side in a front-rear direction on a moving body back and forth on a moving surface, a first drive unit configured to rotate the first wheel while being in pressure contact with an outer circumferential surface of the first wheel; a second drive unit configured to rotate the second wheel in the same direction as the first wheel while being in pressure contact with an outer circumferential surface of the second wheel; a pressing unit that applies forces to the first driving unit and the second driving unit in directions away from each other so as to press the first driving unit toward the first wheel and press the second driving unit toward the second wheel, Simple transportation device.

2. The first drive unit is a first driving roller having a friction surface on an outer periphery thereof that contacts the outer periphery surface of the first wheel and being rotationally driven by a driving source; The second drive unit is a second driving roller having a friction surface on an outer periphery thereof that contacts the outer periphery surface of the second wheel and being rotationally driven by a driving source; The portable transport device of claim 1.

3. a support positioned between the first drive unit and the second drive unit; The pressing unit is an actuator that moves the first drive unit toward and away from the support and moves the second drive unit toward and away from the support; 3. The simplified moving device according to claim 1 or 2.

4. The pressing unit is Further comprising a hydraulic pump section configured to extend at least one hydraulic cylinder that constitutes the actuator. The simplified moving device of claim 3.

5. Further comprising a braking mechanism for braking the first wheel or the second wheel, The braking mechanism includes: a brake shoe configured to press against a side of the first wheel or the second wheel; 3. The simplified moving device according to claim 1 or 2.

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