JP7777337B2 - Power supply device - Google Patents

Description

This invention relates to a power supply device. More specifically, it relates to a power supply device that supplies power to or charges a mobile object.

Patent Document 1 discloses a charging device for vehicles and other mobile objects. This invention proposes a portable rapid charging stand unit that integrates a power source (engine-driven generator) and charging device (rapid charging device), eliminating the need for commercial power receiving equipment construction, allowing for easy installation in a short period of time, and ensuring that charging output is not affected by weather.

Publication No. 3195806

However, while the device in Patent Document 1 is useful in environments where commercial power is not available, the device in Patent Document 1 itself becomes unnecessary in environments where commercial power is available, and opportunities to install this device are lost. If it were possible to supply power to mobile objects regardless of whether commercial power is available, it would be beneficial as it would increase opportunities for use as a power supply device.

On the other hand, if commercial electricity can be used, the engine-driven generator itself, which serves as the power source, is not necessary. Therefore, if you can choose whether or not to install the engine-driven generator as an attachment to the power supply device depending on the usage environment, you can avoid securing unnecessary installation space.

Even if an engine-driven generator is not required, if the available installation space can be used to store maintenance parts for the power supply device and maintenance parts for the mobile object that receives power, it can be useful because the generator and other materials can be moved together with the power supply device.

This invention was made with the above-mentioned issues in mind, and aims to provide a power supply device that can be configured to change its installation style as needed depending on the installation environment, and that can also move various related materials together.

This invention is
A power supply device having a power supply side terminal member that contacts a movable body side terminal member of a movable body to supply power to the movable body,
the power supply device includes a mounting portion on which the moving body can climb;
a loading platform on which an article can be placed, the loading platform being detachably and fixably provided on the loading section;
Equipped with
The loading platform includes a frame that defines a loading area,
the frame body has an adjustment unit that can changeably adjust the mounting area defined by the frame body;
A power supply device comprising:
relates to.

The present invention further provides:
a connecting portion that is detachably provided on the loading platform and that can be connected to a towing vehicle;
A power supply device comprising:
relates to.

The present invention further provides:
a connecting portion that is detachably attached to the loading platform and can be connected to a towing vehicle;
a turning restriction part that can restrict the towing angle relative to the towing vehicle;
A power supply device comprising:
relates to.

The present invention further provides:
a connecting portion that is detachably attached to the loading platform and can be connected to a towing vehicle;
the loading platform is provided near the connecting portion,
relates to.

This invention provides a power supply device that can be configured to change its installation style as needed depending on the installation environment, and that can also move various related materials together.

1 is a plan view showing a state in which a carrier and a coupling part are attached to a power supply device according to an embodiment of the present invention, the wheels are in a ground contact state, and the power supply device is towed by a moving object. 1 is a side view showing a state in which a carrier and a coupling part are attached to a power supply device according to an embodiment of the present invention, the wheels are in a ground contact state, and the power supply device is being towed by a moving object. 1 is a front view of a power supply device according to an embodiment of the present invention, in which a wheel is in a grounded state. 1 is a rear view of a power supply device according to an embodiment of the present invention, with a loading platform and a coupling unit attached, and wheels in a grounded state (shown by solid lines), while wheels in a non-grounded state (shown by two-dot chain lines) are shown. 1 is an enlarged front view of a power supply unit in a power supply device according to an embodiment of the present invention, showing a state in which a second arm is in a retracted position, and a protective cover is shown with a portion cut away. 1 is an enlarged front view of a power supply unit in a power supply device according to an embodiment of the present invention, showing a state in which a second arm is in a retracted position, and a protective cover is shown with a portion cut away. 1 is an enlarged side cross-sectional view of a power supply unit in a power supply device according to an embodiment of the present invention, showing a state in which a second arm is in a retracted position. 1 is an enlarged plan view showing a state in which a loading platform and a connecting portion are attached to a power supply device according to an embodiment of the present invention and the towing vehicle is towed by a moving object, and the power supply device and the towing vehicle are bent in a turning direction (steering direction) relative to each other around a connecting shaft, and movement in the bending direction is restricted by a restricting portion. 1 is an enlarged cross-sectional side view of a main portion of a power supply device according to an embodiment of the present invention, with a loading platform and a connecting portion attached thereto, and the loading platform and the connecting portion enlarged. 1 is a partially enlarged plan view showing a state in which a connecting part is directly attached to a power supply device according to an embodiment of the present invention and the power supply device and the towing vehicle are towed by a moving object, and the state in which the power supply device and the towing vehicle are bent in a turning direction (steering direction) relative to an axis of the connecting shaft and the movement in the bent direction is restricted by a restricting part. 1 is an enlarged cross-sectional view of a main part of a power supply device according to an embodiment of the present invention, in which a connecting portion is attached to the power supply device and the connecting portion is enlarged and cut away. FIG. 1 is a side view of a mobile body for charging according to an embodiment of the present invention, in a power supplying state, being towed by a mobile body for towing. The power supplying device is attached to a loading platform and a coupling portion, and the wheels are in a grounded state. The figure shows a side view of a state in which the mobile body is moved rearward (toward the support portion) with the power supply terminal member and the mobile body terminal member in contact, and the side portion at the tip of the mobile body swings the first arm to operate the switch. The electrode cover is in an exposed state, and is further rotated toward the exposed side by the protruding piece. The first arm swings when pressed by the side portion at the tip of the mobile body, pressing the switch, and the biasing member is extended. FIG. 3 is a flow chart showing the operation of the power supply device according to the embodiment of the present invention.

A moving body A, which is a towing vehicle according to an embodiment of the present invention, a power supply device B, a coupling portion F, a loading platform G, and a wheel portion H will be described with reference to the drawings.
The outline of the configuration relating to power feeding of the power feeding device B will be described.
The power supply device B comprises a mounting section 11 having an access road 12 at one end through which the mobile body A1 to be charged (or a mobile body (towing vehicle) A to be charged) can enter, a power supply section C for supplying power to the mobile body A, and a support section 21 provided at the other end of the mounting section 11.
The power supply section C includes a first arm 31 rotatably supported on the support section 21, a second arm 41 rotatably supported on the support section 21 and provided with a power supply side terminal member 42, a biasing body 35 that applies a force to rotate the second arm 41 toward the first arm 31, and a restricting section 33 that restricts the first arm 31 from approaching the second arm 41.
Reference numeral 34 denotes an attachment position adjustment portion. The attachment position adjustment portion 34 is a portion that makes it possible to adjust the attachment position of the restriction portion 33 relative to the first arm 31, and by changing the position of the restriction portion 33, it is possible to restrict the distance that the first arm 31 approaches the second arm 41.

The placing portion 11 is provided in the power supply device B. The placing portion 11 is capable of allowing the moving object A1 to climb onto it for charging.
The mounting portion 11 has an access path 12 at one end thereof through which the moving body A1 to be charged enters toward the power supply side terminal member 42.
The mobile body A1 to be charged enters the power supply part C from the access path 12 of the mounting part 11 and climbs onto the mounting part 11, and eventually the power receiving part D of the mobile body A1 to be charged comes into contact with the power supply part C, thereby entering a power supply state.
The power receiving unit D includes a movable terminal member 85 that comes into contact with the power supply side terminal member 42 of the power supply unit C in the power supply device B.

The placing section 11 is provided as a platform-like placing table that is U-shaped or C-shaped in a plan view. The power supply section C is located in the center of the U-shaped or C-shaped recess of the placing section 11. An access path 12 is formed at the open end. The mobile object A1 to be charged can climb onto the placing section 11 from the access path 12. The access paths 12 that the traveling section 71 climb onto are provided in two locations on one end side of the placing section 11.
The mounting section 11, which is U-shaped, has an open section E that is open below the mobile unit A1 for charging in a powered state. The open section E, which is surrounded by the mounting section 11, is open below the mobile unit A1 for charging except for the area where the traveling section 71 comes into contact.
The opening E can reduce the ground contact area when installing the power supply device B. The reduction in the ground contact area improves the chances of stable grounding of the power supply device B when it is installed on the installation surface. In the embodiment, the opening E ensures that there are no obstructions between the installation surface on which the power supply device B is installed and below the mobile object A.

Even if there is an obstacle protruding upward toward the mobile object A1 to be charged between the mounting surface of the mounting portion 11 and the mounting surface, the mounting surface can be installed on the installation surface so as to step over the obstacle and avoid it, thereby reducing the influence of the condition of the installation surface. Furthermore, the height of the obstacle may be a height that reaches near the bottom of the main body frame 75, which is a height that a mobile object that has climbed onto the mounting portion 11 can step over.
The open section E is not necessarily free from obstructions on the installation surface and below the mobile body A. If there are no portions of the mounting sections 11 in direct contact with the installation surface, the open section E may have connecting members that do not contact the installation surface but connect the mounting sections 11 on the left and right sides of the traveling direction of the mobile body A. In this case, it is possible to attach equipment and components that can expand the functionality of the power supply device B to the connecting members while avoiding obstacles, which is useful.

When the mobile unit A1 to be charged (or the mobile unit "towing vehicle" A) is in a powered state, the longitudinal distance of the mounting unit 11 relative to the mobile unit A1 to be charged is longer than the distance between the front and rear axles, which is the wheelbase of the running unit 71 of the mobile unit A1 to be charged. In the example, the longitudinal distance of the mounting unit 11 relative to the mobile unit A1 to be charged is longer than the front-to-rear ground contact length of the running unit 71. Therefore, when in a powered state, the entire running unit 71 can be positioned on the mounting unit 11, and the mobile unit A1 to be charged can be stably positioned on the power supply device B.

By configuring the traveling section 71 of the moving body A1 for charging to be located on the placing section 11, the moving body A1 for charging can be moved together with the power supply device B.
For example, by lifting the power supply device B with a crane device or lifting it from below with a lifting device, it is possible to move the power supply device B and the mobile body A1 to be charged together without having to separately support the mobile body A1 to be charged.

When the mobile object A1 to be charged heads toward the power supply C from the access path 12, the position and orientation of the power receiving unit D of the mobile object A1 to be charged is aligned with the position and orientation of the power supply C, and the mobile object A1 to be charged heads toward the power supply C. In other words, the mobile object A1 to be charged must align the position of the power receiving unit D, which is located in the center left-right of the lower part of the main frame 75 in the direction of travel, with the second arm 41, and then move backward toward the second arm 41 onto the platform 11 in a direction intersecting the rotation axis of the second arm 41, and then move appropriately on the platform 11 toward the second arm 41, which is the power supply C.

Reference numeral 15 denotes a guide plate. The mounting portion 11 is provided with the guide plate 15. The guide plate 15 is made of a rectangular plate-shaped member. A pair of guide plates 15 are provided on the left and right outer sides of the moving body A1 to be charged placed on the mounting portion 11 in the direction of travel of the moving body A1 to be charged, facing each other with the running portion 71 of the moving body A1 to be charged in between.
The guide plate 15 is disposed along the entrance path 12 of each mounting portion 11, extending from the entrance path 12 toward the power supply portion C. The upper portion of the guide plate 15 is provided with a folded portion 16 that is bent obliquely toward the outside of the mounting portion 11.

The folded portion 16 at the top of the guide plate 15 prevents the charging mobile unit A1, which moves along the guide plate 15, from sliding downward along the slope of the folded portion 16 even if it tries to forcibly climb onto the guide plate 15. Therefore, the guide plate 15 not only prevents the charging mobile unit A1 from turning, but also prevents it from climbing over the guide plate 15. Furthermore, even if the running unit 71 equipped with crawlers shown in the figure has a stronger ground contact driving force than the running unit 71 mainly composed of wheels (not shown), the running unit 71 that runs along the guide plate 15 and climbs over the folded portion 16 will slide down. Therefore, the running unit 71 can be prevented from climbing over the guide plate 15 and departing from the placement unit 11.
The guide plate 15 allows the moving body A1 to be charged to enter the appropriate placement section 11 and moves the moving body A1 to be charged appropriately toward the power supply section C on the placement section 11, making it impossible for the moving body A1 to be charged to turn.

The opposing distance, which is the distance between the opposing surfaces of the guide plates 15, is set to be slightly larger than the overall width of the pair of traveling sections 71. In this embodiment, the opposing distance of the guide plates 15 is set to be slightly larger, approximately 101 to 105%, than the overall width of the pair of traveling sections 71 provided on the left and right sides of the mobile body A1 to be charged. This opposing distance makes it possible to accurately align the left-right positions of the power receiving unit D and power supply unit C of the mobile body A1 to be charged that has entered from the entrance path 12 with respect to the mobile body A1 to be charged.
The distance between the guide plate 15 and the moving object A1 for charging is longer than the axle distance, and the guide plate 15 is provided continuously from the access road 12 toward the power supply C. In other words, the length of the guide plate 15 is longer than the ground contact length. It can also be said that the distance between the guide plate 15 and the moving object A1 for charging in the direction parallel to the moving direction is longer than the axle distance between the front and rear wheel axles of the traveling part 71.

In this way, the mobile body A1 for charging enters from the entrance road 12 while aligning the left and right positions of the power receiving part D and the power supply part C, and since the running part 71 is positioned so as to be sandwiched between the guide plates 15 even after entering, it can move towards the power supply part C along the guide plates 15 without turning.
The length of the guide plate 15, which is arranged parallel to the traveling direction of the mobile unit A1 to be charged, is long and continuous relative to the traveling section 71, so even if the mobile unit A1 to be charged tries to turn suddenly while moving on the device section, the turning is prevented by the guide plate 15. In other words, the mobile unit A1 to be charged that has entered from the entrance path 12 can maintain the positional relationship between the power supply unit C and the power receiving unit D to the left and right of the traveling direction.

On the approach path 12 side of each guide plate 15, an approach guide section 14 is provided to forcibly position the mobile unit A1 to be charged entering from the approach path 12 between the guide plates 15. The approach guide sections 14 are plate-shaped and are arranged so that their width increases from the power supply section toward the approach path 12 in a plan view. Even if the orientation or position of the mobile unit A1 to be charged is misaligned with respect to the power supply section C, the approach guide sections 14 allow the mobile unit A1 to be positioned between the guide plates 15 by traveling along the approach guide section 14 without the operator or observer having to perform any special operation, and the position and orientation relationship between the power supply section C and the power receiving section D can be aligned or maintained.

A slope 13 is provided on the access path 12. The slope 13 is provided on the access path 12 side of the mounting unit 11, with one end being a horizontal axis 18 facing left and right that intersects with the direction of travel of the mobile object A1 to be charged, and the other end being able to rotate and swing up and down. The slope 13 can rotate so that its tip touches the installation surface, even on uneven installation surfaces, and can assist the mobile object A1 to be charged in entering the mounting unit 11. Even if the access path 12 is raised above the installation surface, the other end of the slope 13 can touch the installation surface, so there are no restrictions on where the power supply device B can be installed.

An adjuster 17 that can be brought into contact with the installation surface and can adjust the installation height is provided below the mounting portion 11. The adjuster 17 can be adjusted to protrude from and retract into the bottom surface of the mounting portion 11 in the vertical direction.
The adjuster 17 prevents the power supply device B from tilting or swinging even if the ground below the mounting section 11 is uneven with unevenness, etc., and the mobile body A1 for charging can easily enter the mounting section 11.

In the power supply device B of this invention, when the mobile body A1 to be charged moves backward through the access path 12 of the mounting base of the power supply device B and approaches a power supply position where power can be supplied, the power supply side terminal member 42 comes into contact with the mobile body side terminal member 85 provided on the mobile body A1 to be charged, thereby enabling electricity to be supplied.
More specifically, as the self-propelled moving body A1 to be charged approaches the support post 21, the second arm 41 having the power supply-side terminal member 42 in the lying state rises, and the power supply device B enters an upright state, and the power supply-side terminal member 42 comes into contact with the moving body-side terminal member 85 provided on the moving body A1 to be charged, thereby supplying power to the moving body A1 to be charged. Note that the explanation in this embodiment will be given assuming that the power to be supplied is DC.

The mobile unit-side terminal member 85 is located under the main body frame 75 at the rear end, which is one end of the mobile unit A1 for charging. The mobile unit-side terminal member 85 is a flat, conductive member with its surface facing downward. The mobile unit-side terminal member 85 also has a pair of positive and negative electrodes, which are arranged side by side in the center of the left and right sides of the main body frame 75 in the direction of travel. Power can be supplied when the positive and negative electrodes of the mobile unit-side terminal member 85 come into contact with the positive and negative electrodes of the power supply-side terminal member 42, respectively.

The first arm 31 is provided on the power supply device B so as to be able to swing in the direction of travel of the moving body A1 to be charged by being pushed by the moving body A1 to be charged as the moving body A1 to be charged travels.
The first arm 31 is a long member oriented obliquely upward so that its upper portion is closer to the moving body A1 to be charged, and is rotatably supported on the lower part of the support part 21 so that its upper portion, which is the other end, can swing back and forth around a rotation fulcrum shaft 32. The swing fulcrum shaft of the first arm 31 is oriented in a direction intersecting the traveling direction of the moving body A1 to be charged.
The first arm 31 is pushed by the moving body A1 for charging as the moving body A1 for charging moves forward, and is thereby capable of swinging in the direction of movement of the moving body A1 for charging.

The second arm 41 is a long member, one end of which is supported by the support column 21, and the other end of which is movable up and down. In the embodiment, the one end of the second arm 41 is provided on a rotation fulcrum shaft 32 that is coaxial with the one end of the first arm 31, but this is not necessarily limited to this. For example, the rotation fulcrum shaft 32 on the one end of the second arm 41 may be provided at a position different from and parallel to the fulcrum shaft on the one end of the first arm 31.
Second arm 41 is made of an insulating material so that electricity flowing through power supply side terminal member 42, which is a conductive member provided at the tip of the other end of second arm 41, is not transmitted to other members of power supply device B (e.g., first arm 31, support column 21, etc.) via second arm 41. In the embodiment, second arm 41 is made of a plastic resin, but the material of second arm 41 is not limited as long as it is made of an insulating material that can achieve the purpose of insulation.

Two second arms 41 are provided as a pair and are arranged parallel to each other. The other end of each second arm 41 rotates up and down around the rotation fulcrum shaft 32 from a storage position in which the longitudinal direction is laid down substantially horizontally to a power supply position in which the longitudinal direction is raised from the horizontal. Each of the two second arms 41 rotates independently about the rotation fulcrum shaft 32, and the first arm 31 and the second arm 41 rotate independently.
The second arm 41 can swing in conjunction with the first arm 31, and has a power supply side terminal member 42 that approaches a movable body side terminal member 85 provided on the movable body A1 side for charging when the first arm 31 is pushed by the movable body A1 for charging, and can come into contact with the movable body side terminal member 85.

The biasing member 35 is provided on the first arm 31. The biasing member 35 applies a force to the second arm 41 in a direction in which the second arm 41 approaches the first arm 31 side.
The biasing member 35 is provided so as to bridge the intermediate portion of the first arm 31 and the intermediate portion of the second arm 41. In this embodiment, the biasing member 35 is a tension coil spring, which is an elastic body, and a biasing force is always applied so that the other ends of the first arm 31 and the second arm 41 approach each other. The biasing member 35 is provided on each of the two second arms 41.

In this embodiment, the restricting portion 33 is a pentagonal piece member provided on the side of the middle portion of the first arm 31. One side of the restricting portion 33 comes into contact with the second arm 41, thereby restricting the first arm 31 and the second arm 41 from rotating in a direction in which they approach each other. The restricting portion 33 is provided to prevent the first arm 31 and the second arm 41 from coming too close to each other due to the biasing body 35.
A restricting unit 33 is provided to prevent the first arm 31 and the second arm 41 from being sandwiched below a predetermined angle and to prevent the distance between their other ends from being below a predetermined distance. This prevents the first arm 31 from tilting excessively downward when the second arm 41 is in a storage position where it is lying face down parallel to the mounting unit 11. The restricting unit 33 is provided so that its attachment position relative to the first arm 31 can be shifted by an attachment position adjusting unit 34, allowing the sandwiching angle between the first arm 31 and the second arm 41 to be adjusted appropriately. The attachment position adjusting unit 34 allows the first arm 31 to be in an appropriate position, thereby optimizing the contact position between the first arm 31 and the mobile object A1 for charging.

The restricting unit 33 is configured to adjust the angle between the first arm 31 and the second arm 41, making it possible to appropriately adjust the contact position of the first arm 31 of the charging mobile unit A1, which moves up and down due to wear on the running part 71 of the charging mobile unit A1 (wear on the tracks in the example, or wear on the tires in the example not shown). In other words, because the charging mobile unit A1 can push against the same position on the first arm 31, the timing at which the second arm 41 rises can be kept the same regardless of the height of the charging mobile unit A1.

The support pillar 21 is on the fulcrum side of the first arm 31 and is fixed to the mounting portion 11 provided on the power supply device B, which is a mounting base. The support pillar 21 is provided to protrude upward firmly enough so that it will not deform even if it is pushed or hit by the moving object A1 to be charged.
The support portion 21 restricts the swinging in the direction in which it is pushed as the moving body A1 for charging the first arm 31 moves forward, and forcibly stops the movement of the moving body A1 for charging via the first arm 31.
The charging moving body A1 enters the upper portion, which is the other end side of the first arm 31 that is rotatable relative to the support column 21, from the entrance path 12 and gradually approaches the first arm 31, and then the side portion 77, which is the tip of the charging moving body A1, comes into contact with the first arm 31. Furthermore, the charging moving body A1 is advanced toward the support column 21, and the first arm 31 is pushed by the side portion 77 of the charging moving body A1, causing it to swing toward the support column 21.
When the first arm 31 swings toward the support column 21, the first arm 31 comes into contact with the support column 21, and further swinging is restricted. The moving body A1 to be charged is restricted from moving any further by the support column 21 via the first arm 31.

A switch 22 is provided on the upper part of the support column 21 of the power supply device B. The switch 22 is operated when the moving object A1 to be charged presses the switch 22 toward the support column 21 via the first arm 31. Whether the switch 22 is operated or not is one of the conditions for determining whether or not power is supplied to the battery 76, which is the power storage device of the moving object A1 to be charged, via the power supply-side terminal member 42 and the moving object-side terminal member 85.
The switch 22 is operable by swinging the first arm 31, and the power supply unit C starts supplying power to the battery 76 on the condition that the operation is completed and contact between the movable body side terminal member 85 and the power supply side terminal member 42 is completed.

The power supply side terminal member 42 will now be described.
The power supply side terminal member 42 contacts the mobile body side terminal member 85 that can be exposed downward from the mobile body A1 to be charged, and supplies power to the mobile body A1 to be charged.
A power supply-side terminal member 42 is disposed at the tip end of each of the two second arms 41 on the other end side. One of the power supply-side terminal members 42 is a positive electrode, and the other is a negative electrode. A pair of mobile body-side terminal members 85, which are power receiving-side terminal members on the mobile body A1 side for charging, are also provided, with one of the mobile body-side terminal members 85 being a positive electrode and the other being a negative electrode. Because the second arm 41 to which the power supply-side terminal members 42 are attached is made of an insulator, electricity applied to the power supply-side terminal members 42 does not leak to other members.

By contacting the positive electrode of the power supply side terminal member 42 with the positive electrode of the mobile unit side terminal member 85, and also contacting the negative electrode of the power supply side terminal member 42 with the negative electrode of the mobile unit side terminal member 85, and then applying a DC voltage from the power supply device B, power can be supplied to and charged by the battery 76, which is a power storage device provided on the mobile unit A1 for charging.

The contact surface 43 of the power supply-side terminal member 42 with the movable body-side terminal member 85 is provided as a flat surface, and the power supply-side terminal member 42 is provided with a terminal fulcrum portion 44 that allows the contact surface 43 to tilt and swing in the front-to-rear direction relative to the second arm 41. The axial direction of the terminal fulcrum portion 44 is provided parallel to the rotation fulcrum shaft 32 of the first arm 31 and the second arm 41. When the second arm 41 is in the retracted position, the contact surface 43 is arranged so as to tilt upward and slightly toward the other end of the second arm 41.
The power supply side terminal member 42 has a restricting pin 46 that protrudes toward the second arm 41 and is disposed in a hole 47 provided on the other end side of the second arm 41. The restricting pin 46 is provided movably within the hole 47 and restricts the rotation of the power supply side terminal member 42 around the terminal fulcrum part 44 to within a range up to which the restricting pin 46 contacts the edge of the hole 47.
The terminal fulcrum portion 44 is provided so that the second arm 41 can swing relative to the first arm 31 .

45 denotes a terminal biasing element. The terminal biasing element 45 is provided on the power supply side terminal member 42. The terminal biasing element 45 rotates the power supply side terminal member 42, which rotates around the terminal fulcrum 44, in one direction. In the present embodiment, the terminal biasing element 45 is positioned so that the contact surface 43 faces the other end of the second arm 41. In the present embodiment, the terminal biasing element 45 uses a leaf spring to apply force to at least one side of the power supply side terminal member 42, thereby applying a rotational force to the power supply side terminal member 42. However, the type of biasing element may be any elastic body, such as a coil spring or helical spring.

A protruding piece 61 is provided on the side of the second arm 41, which is on the side of the power supplying section C of the power supply device B. The protruding piece 61 is a member having a beak-shaped projection 63 in a side view at the tip facing the front of the moving body A1 for charging from the support section 21 side of the power supply device B, and is fixed to the mounting section 11, which is a mounting base. The protruding piece 61 is fixed to the power supply device B and protrudes from the power supply-side terminal member 42 toward the moving body A1 for charging.
In this embodiment, the protruding piece 61 is formed of a plate-like member and is provided adjacent to the second arm 41 on the left side of the moving body A1 for charging in the forward direction.

The inclined portion 64 is provided on the protruding piece 61 so as to be inclined downward from the tip of the protruding piece 61 on the mobile object A1 side for charging to the bottom of the protruding piece 61 toward the support part 21 side.
The upper part of the inclined part 64 is disposed to protrude further toward the mobile object A1 to be charged than the power supply side terminal member 42 in a side view, and reaches the lower part of the protruding part 63 .
The upper part of the protrusion 63 is formed in an arc shape so as to gradually slope downward from the upper end of the protruding piece 61 in the direction from the access path 12 of the mobile object A1 for charging toward the support part 21.

The protrusion 63 has a slope 64 that slopes downward in an arc shape from the sharp tip of the protrusion 63 toward the support 21 from the entrance 12 of the mobile unit A1 for charging. In this embodiment, the slope 64 is arc-shaped. Therefore, the movement of the members sliding on the slope 64 is smooth.
The inclined portion 64 is provided so that the angle of inclination gradually becomes vertical in the direction from the access path 12 of the mobile object A1 to be charged toward the support portion 21 and toward the lower end. The inclined portion 64 located at the bottom of the protruding piece 61 is provided so as to be almost vertical. In the embodiment, the inclined portion 64 is provided so as to be curved in an arc shape, but it may also be configured by combining multiple straight portions.

The positional relationship between the protruding piece 61 and the second arm 41 will be described.
The protrusion 63 and the inclined portion 64 of the protruding piece 61 are positioned in a direction from one end toward the other end of the second arm 41, and are positioned at a position further extended toward the other end. In other words, the inclined portion 64 is positioned to protrude further toward the movable body A1 for charging than the power supply-side terminal member 42 in a side view. This allows the electrode cover 81, which is disposed on the movable body A1 for charging (described later), to start rotating from the closed state to the exposed state before the second arm 41 transitions from the retracted position to the power supply position. Furthermore, the positional relationship between the protruding piece 61 and the second arm 41 described above prevents the second arm 41 and the electrode cover 81 from interfering with each other until the power supply-side terminal member 42 of the second arm 41 moves toward the movable body-side terminal member 85, which is disposed on the movable body A1 for charging.

The positional relationship between the protruding piece 61 and the mobile object A1 to be charged will be described.
The protruding piece 61 is positioned in the width direction relative to the direction of travel of the mobile object A1 to be charged, in agreement with an operating unit 82 (described later) provided on the electrode cover 81 of the mobile object A1 to be charged. Furthermore, the upper end of the protruding piece 61 is positioned lower than the underside of the main frame 75 of the mobile object A1 to be charged. With this configuration, when the mobile object A1 to be charged enters the mounting base 11 from the entrance path 12, the protruding piece 61 does not interfere with the main frame 75, and the protruding portion 63 can reach the operating unit 82. Furthermore, as the mobile object A1 to be charged enters, the operating unit 82 is pressed against the inclined portion 64 at the bottom of the protruding portion 63, thereby moving the operating unit 82 downward. In other words, contact between the protruding piece 61 and the operating unit 82 rotates the electrode cover 81 from the closed state to the exposed state.

The positional relationship between the protruding piece 61 and the moving object A1 to be charged during power supply will be described.
The lower part of the inclined part 64 formed from the protrusion 63 of the protruding piece 61 is disposed forward of the mobile unit terminal member 85 in the forward direction of the mobile unit A1 to be charged when the electrode cover 81 is in a fully exposed state in which the mobile unit A1 to be charged is ready to be charged. In other words, in a side view, the front end of the mobile unit terminal member 85 when the mobile unit A1 to be charged is in a powered state is disposed in a position that does not overlap with the lower part of the inclined part 64 in the front-to-rear direction of the mobile unit A1 to be charged. This allows the operating unit 82 to be moved significantly downward and forward of the mobile unit A1 to be charged to widely open the electrode cover 81.

The divided structure of the protruding piece 61 will be described.
The protruding piece 61 may be divided and fixed to the power supply device B. In this embodiment, the protruding piece 61 is divided into a protruding piece main body 611 having a protrusion 63 for operating the operation unit 82, and an attachment portion 62 of the protruding piece 61 for fixing the protruding piece main body 611 to the power supply device B. The attachment portion 62 of the protruding piece 61 and the protruding piece main body 611 are fixed to each other with fastening members consisting of bolts and nuts.
The attachment portion of the protruding piece 61 has a long hole 65, and the height position of the upper end of the protruding piece 61 can be adjusted by adjusting the fastening position of the fastening member within the long hole 65. As a result, even if the relative height of the main body frame 75 to the power supply device B changes due to wear of the running part 71 (crawler in this embodiment) of the mobile body A1 for charging, by adjusting the vertical position of the main body of the protruding piece 61, the protruding piece 61 does not interfere with the main body frame 75, and the operating part 82 can be reliably operated at the inclined portion 64.

A protective cover 51 is provided on the mounting portion 11 so as to cover the other end of the second arm 41, and the protective cover 51 is provided so that the second arm 41 can be extended and retracted toward the movable body side terminal member 85, and has a notch 511 through which the second arm 41 can pass.
When the second arm 41 is in the retracted position, the protective cover 51 covers the other end of the second arm 41 and the upper part of the power supply-side terminal member 42. The protective cover 51 has a notch 511 at the upper part that allows the other end of the second arm 41 and the power supply-side terminal member 42 to pass through as the second arm 41 rotates between the retracted position and the power supply position. Furthermore, a shielding cover 52 is provided to cover the notch 511. The shielding cover 52 is made of a flexible, non-conductive, non-conductive material. In this embodiment, a rubber-like plate is used.

The shielding cover 52 has a slit 521 formed in a direction parallel to the longitudinal direction of the second arm 41 in the storage position. The slit 521 is normally closed, and when the second arm 41 rotates, the other end of the second arm 41 and the power supply terminal member 42 push the shielding cover 52 aside, opening the slit, allowing the other end of the second arm 41 and the power supply terminal member 42 to appear and disappear from the protective cover 51. The slit 521 in the shielding cover 52 is formed by arranging the shielding covers 52 so that they overlap each other. Covering the upper part of the second arm 41 in the storage position with the shielding cover 52 and the slit 521 prevents foreign matter from adhering to the power supply terminal member 42. The slit 521 formed by overlapping the shielding covers 52 tightly closes the gap, preventing foreign matter from easily passing through the slit 521 and entering below the shielding cover 52.

The mobile unit (towing vehicle) A and the mobile unit A1 to be charged will be described.
In this embodiment, the mobile unit (tractor) A and the mobile unit A1 to be charged are self-propelled brush cutters. The present invention can be applied to the mobile unit A1 to be charged, regardless of whether it is manually operated, including remotely controlled, or whether it runs independently under autonomous control.
The mobile unit (towing vehicle) A and the mobile unit A1 for charging can move forward and backward and turn left and right as they move forward and backward. The mobile unit A1 for charging has a main frame 75 and running units 71 at the left and right ends of the main frame 75 in the direction of travel.

In this embodiment, the traveling unit 71 is a crawler device equipped with tracks, and the left and right turning is performed by the difference in speed between the left and right tracks, causing the mobile unit A1 to move forward and backward and turn. The traveling unit 71 drives the drive wheels 72 with an electric motor to rotate the tracks, thereby moving the mobile unit A1 to charge.
The mobile body moves backward and approaches the power supply unit C. The traveling unit 71 does not have to be the crawler device shown in the figure, and may be a traveling unit 71 having a plurality of wheels (preferably four wheels).

In the case of a crawler device, it has at least a drive wheel 72 and an idler wheel 73, and may further have one or more rollers 74. In an embodiment of the present invention, any of the drive wheel 72, idler wheel 73, and roller 74 that are located on the rearward side in the direction of travel that forms the contact length of the crawler device may be referred to as a rear wheel, and any of the drive wheel 72, idler wheel 73, and roller 74 that are located on the forward side in the direction of travel may be referred to as a front wheel.
In the embodiment, the wheels 74 located on the rear side are referred to as rear wheels, and the idler wheels 73 located on the front side are referred to as front wheels. In addition, in the embodiment, the drive wheels 72 located on the rear side of each of the left and right sides are equipped with motors (not shown) and are driven to rotate by power from a battery 76.

The battery 76 is installed on the main body frame 75. The battery 76 is a power storage device that serves as the power source for the electric motor. The electric motor rotates and drives by consuming power from the battery 76. A mobile body side terminal member 85 is provided on the lower part of the main body frame 75 at the rear end, which is one end of the mobile body A1 to be charged. Power can be supplied to the battery 76 by contacting the power supply side terminal member 42 provided on the power supply device B. With this configuration, the battery 76, which is a power storage device, can be charged without removing it from the mobile body A1 to be charged.

The electrode cover 81 is provided on the movable body A1 to be charged so as to surround the sides and bottom of the movable body-side terminal member 85. The electrode cover 81 is a container-shaped box-like member, and is provided so as to be rotatable with a rotation fulcrum 83 located on the front side, which is the other end side, of the movable body A1 to be charged.
The electrode cover 81 can be repositioned between a closed state in which it covers the periphery of the movable body side terminal member 85 to prevent the intrusion of foreign matter, and an exposed state in which it exposes the movable body side terminal member 85 and makes it possible to connect it to the power supply side terminal member 42.
The electrode cover 81 has an operating portion 82 that is operated by the protruding piece 61 to change the position of the cover from a closed state to an exposed state.

The electrode cover 81 rotates to freely change position between a closed state in which it covers the periphery of the movable body side terminal member 85 to prevent the intrusion of foreign matter, and an exposed state in which it exposes the movable body side terminal member 85 and makes it possible to connect it to the power supply side terminal member 42.
The inner surface of the rear side, which is the side opposite to the pivot point 83 of the electrode cover 81 in the closed state, gradually moves upward toward the movable body A1 for charging as the electrode cover 81 transitions to the exposed state. Furthermore, when the electrode cover 81 reaches the end of its rotational direction toward the exposed state, the inner surface tilts upward and backward toward the movable body A1 for charging. In other words, even if there is a foreign object inside the electrode cover 81, by transitioning the electrode cover 81 to the exposed state, the foreign object can fall downward along the inner surface due to its own weight.

When the electrode cover 81 is changed from a closed state to an exposed state, the inner surface is tilted, allowing foreign objects and the like to fall due to gravity. In the exposed state, the operating unit 82 is positioned forward relative to the movable body side terminal member 85. In other words, the electrode cover 81 rotates until the operating unit 82 in the exposed state is positioned forward of the pivot point 83 of the electrode cover 81. By adopting this positional relationship, the inner surface of the electrode cover 81 is reliably tilted.

84 is an elastic body. The elastic body 84 constantly applies force to the side in which the electrode cover 81 is closed. The elastic body 84 is provided near the pivot point 83 of the electrode cover 81. In this embodiment, a coil spring is used as the elastic body 84, and the coil spring is incorporated into the hinge portion which is the pivot point 83. The elastic body 84 constantly applies force to the electrode cover 81 so as to rotate the rotatable electrode cover 81 towards the closed state.

The electrode cover 81 has an operating unit 82 at one end, which is the rear end in the direction of travel of the mobile unit A1 to be charged. The operating unit 82 is a pin-shaped member that protrudes left and right from either the left or right side of the electrode cover 81 in the direction of travel. In this embodiment, the operating unit 82 is provided so as to protrude from the rear and left side of the electrode cover 81 in the direction of travel toward the left side in the direction of travel. The electrode cover 81 can be rotated between a closed state and an exposed state by operating the operating unit 82. In the exposed state, the operating unit 82 is positioned so that it does not overlap vertically with the mobile unit-side terminal member 85 of the mobile unit A1 to be charged in the power supply state, as viewed from the side. In other words, the operating unit 82 in the exposed state is positioned at the other end, which is the front end of the mobile unit A1 to be charged via the mobile unit-side terminal member 85.

In the closed state, the operating unit 82 is disposed with a gap between it and the underside of the main body frame 75. The protruding piece 61, which is a member for operating the operating unit 82, is inserted into this gap to change the electrode cover 81 from the closed state to the exposed state.
The rear surface of the electrode cover 81, which is the side surface on which the operating portion 82 is disposed, is inclined downward in the exposed state, making it easier to expel foreign matter.

The operation and effect of the embodiment of the present invention in relation to power supply work will be described in conjunction with actual work.
The retracted position of the second arm 41 when the moving object A1 to be charged is not placed on the placement unit 11 serving as a placement stand will be described.
When the mobile unit A1 to be charged is not placed on the mounting portion 11, the second arm 41 rotates downward under its own weight and assumes a stored position. At this time, the contact surface 43 of the power supply side terminal member 42 is biased by the terminal biasing body 45 and is positioned so as to be inclined upward and slightly horizontally, so that foreign matter on the contact surface 43 falls along the inclination, and the contact surface 43 can be kept clean.
The upper part of the power supply side terminal member 42 is covered with the protective cover 51 and the shielding cover 52, so even if foreign matter falls from above, it will not adhere to the contact surface 43. In addition, since the slits 511 are provided so as to overlap each other, the slits 511 turn up to create gaps, preventing the intrusion of foreign matter through these gaps.

A force is applied to the first arm 31 by the biasing member 35 so as to bring it closer to the second arm 41. At this time, the restricting portion 33 restricts the first arm 31 from completely falling toward the second arm 41, so that the first arm 31 can maintain a state in which it is tilted obliquely relative to the support portion 21.
Before the moving object A1 to be charged enters the power supply device B, the electrode cover 81 of the moving object A1 to be charged is in a closed state, and the second arm 41 is in a retracted position or a retracted state.

The entry of the mobile object A1 into the placement section 11, which is a placement stand for the mobile object A1 to be charged, will be described.
A mobile object A1 to be charged enters the platform from the entrance 12 and gradually approaches the support column 21 side.
The moving object A1 to be charged is located on the access path 12 of the power supply device B, and is in the middle of entering the power supply device B. The electrode cover 81 of the moving object A1 to be charged is in the closed state. The second arm 41 is in the stored position or in the stored state.

The mobile unit A1 for charging enters the access path 12 in a reverse state and approaches the support column 21. As the mobile unit A1 for charging continues to enter, the side portion 77 located at the tip of the mobile unit A1 for charging eventually comes into contact with the upper portion of the first arm 31 in a laid-down state.
As the mobile body A1 for charging continues to move backward into the power supply device B and enter, the operating part 82 moves relative to the protruding piece 61 located below the main frame 75, and eventually the tip of the protruding part 63 is positioned between the operating part 82 and the main frame 75 and enters between them.

When the mobile object A1 for charging enters the power supply device B and moves on the mounting portion 11 toward the power supply portion C, the second arm 41 remains in the stored position or stored state, and the protrusion portion 63 of the protruding piece 61 is positioned between the operating portion 82 and the main body frame 75.
When the electrode cover 81 of the mobile body A1 to be charged is in a closed state, the left and right deviation of the mobile body A1 to be charged relative to the traveling direction is restricted by the guide plate 15, and the mobile body A1 to be charged moves toward the power supply part C.

When the moving body A1 for charging further moves on the mounting portion 11 of the power supply device B toward the power supply portion C, the inclined portion 64 of the protruding piece 61 presses down the electrode cover 81 of the moving body A1 for charging, the moving body A1 for charging comes into contact with the first arm 31, and the electrode cover 81 of the moving body A1 for charging operates the operating portion 82 with the protruding piece 61 between the operating portion 82 and the main body frame 75, and is in the middle of rotating toward the exposed side. The second arm 41 is in the stored attitude or state.
If the charging movable body A1 continues to move backward while the side part 77, which is the tip of the movable body A1 for charging, remains in contact with the upper part of the first arm 31, the first arm 31 will rotate toward the support part 21 around the swing fulcrum axis.
Furthermore, as the mobile body A1 for charging is moved toward the support portion 21, the operating portion 82 is pushed down while sliding along the inclined portion 64 of the protruding piece 61, causing the electrode cover 81 to rotate in the direction from the closed state to the exposed state.

Furthermore, when the mobile body A1 for charging moves on the mounting portion 11 toward the power supply portion C of the power supply device B, the inclined portion 64 of the protruding piece 61 further presses down the electrode cover 81 of the mobile body A1 for charging, and the mobile body A1 for charging pushes the first arm 31 backward, causing the second arm 41 to float up and pass through the protective cover 51 (slit 521 of the shielding cover 52).
The electrode cover 81 of the moving body A1 for charging is in the middle of rotating toward the exposed side by the protruding piece 61. The first arm 31 is pushed by the side portion 77, which is the tip of the moving body A1 for charging, and swings toward the support portion 21, and the second arm 41 is in the middle of rotating toward the power supply posture in conjunction with the first arm 31.

In response to the rotation of the first arm 31 , the second arm 41 starts to rise from the stored position via the biasing member 35 , and the second arm 41 gradually rises in conjunction with the swinging of the first arm 31 .
When the operating unit 82 reaches the lower end of the inclined portion 64, the second arm 41 moves up into the power supply position in conjunction with the first arm 31, which is swung toward the support 21 by the moving body A1 for charging. At this time, the electrode cover 81 is being operated by the lower end of the inclined portion 64 toward the forward direction of the moving body A1 for charging the operating unit 82, so there is no interference with the electrode cover 81 when the second arm 41 moves.

Furthermore, when the moving body A1 for charging moves on the power supply device B toward the power supplying portion C, the operating portion slides the inclined portion 64 to further press down the electrode cover 81 of the moving body A1 for charging in the direction to expose it. The moving body A1 for charging pushes the first arm 31 rearward toward the support portion 21, causing the second arm 41 to rise, and the power supplying terminal member 42 contacts the moving body terminal member (power receiving portion D) to assume the power supplying position. The electrode cover 81 of the moving body A1 for charging is then rotated toward the exposed side by the protruding piece 61 and assumes the exposed position. The first arm 31 is pushed by the side portion 77 at the tip of the moving body A1 for charging and swings further toward the support portion, causing the power supplying terminal member 42 to assume the power supplying position in contact with the moving body terminal member (not shown). However, power supply does not start with the positional relationship between the moving body A1 for charging and the power supplying device B.
As the second arm 41 rises, the other end of the second arm 41 and the power supply-side terminal member 42 push aside the slit 511 in the protective cover 51 and are positioned above the protective cover 51. As the movable body A1 for charging moves backward, the movable body-side terminal member 85 is positioned above the power supply-side terminal member 42, and they eventually come into contact with each other.

The power supply posture will be described.
Furthermore, as the mobile body A1 for charging moves backward and moves over the power supply device B, the power supply side terminal member 42 and the mobile body terminal member (not shown) come into contact, and the mobile body A1 for charging is moved further backward (towards the support portion 21), and the side portion 77 at the tip of the mobile body A1 for charging swings the first arm 31 to operate the switch 22.
The electrode cover 81 is in an exposed state and is further rotated toward the exposed side by the protruding piece 61, and the first arm 31 is pushed by the side portion 77, which is the tip of the movable body A1 for charging, to swing and press the switch 22, and the biasing body 35 assumes an extended state. The second arm 41, which has been set in the power supply position by the biasing body 35, can swing independently of the second arm 41 even when its swing is fixed.
By rotating the first arm 31 toward the support portion 21, the second arm 41 is rotated upward, the power supply side terminal member 42 of the second arm 41 comes into contact with the movable body side terminal member 85, and the second arm 41 assumes the power supply position.

When the mobile body A1 for charging is moved toward the support part 21, the operating part 82 is pressed by the lower end of the inclined part 64, causing the electrode cover 81 to rotate to the end of the rotation direction and become exposed, and at the same time, the power supply side terminal member 42 carried by the second arm 41 comes into contact with the mobile body side terminal member 85, assuming a power supply position in which power can be supplied.
When the electrode cover 81 is rotated to the end of its rotation direction, the inner surface of the rear side of the electrode cover 81 is inclined, so that the electrode cover 81 can be turned upside down, and any foreign matter inside the electrode cover 81 can be dropped down along the inner surface. Therefore, the inside of the electrode cover 81 is cleaned every time power is supplied, and can be kept clean at all times.

The power supply side terminal member 42 is configured to rotate around the terminal fulcrum 44 while receiving a rotational force from the terminal biasing body 45, allowing the contact surface 43 to make surface contact with the mobile body side terminal member 85. In other words, even if the vertical positional relationship or relative front-to-back angle of the mobile body side terminal member 85 relative to the second arm 41 shifts due to wear on the running part 71 of the mobile body A1 used for charging (wear on the tracks in the example, or wear on tires, etc. in the example not shown), the power supply side terminal member 42 rotates around the terminal fulcrum 44, ensuring an area where the contact surface 43 comes into contact with the mobile body side terminal member 85. The terminal biasing body 45 ensures this contact.

Furthermore, each of the pair of second arms 41 can rotate independently, and an upward force is applied to each second arm 41 by the biasing element 35. Therefore, even if the mobile body A1 for charging itself is tilted forward, backward, left, or right relative to the power supply device B, the pair of power supply-side terminal members 42 and the pair of mobile body-side terminal members 85 can reliably contact each other.

Even when the power supply side terminal member 42 comes into contact with the movable body side terminal member 85, power is not yet supplied. To start power supply, the first arm 31 must be further swung toward the support section 21 by the movable body A1 for charging. When the movable body A1 for charging is further moved backward toward the support section, the first arm 31 rotates toward the support section 21. Meanwhile, the second arm 41 does not rotate because the power supply side terminal member 42 and the movable body side terminal member 85 are in contact, and the biasing member 35 provided between the first arm 31 and the second arm 41 extends. The restricting member 33, which moves with the first arm 31, also moves away from the second arm 41.

The power supply start operation will now be described.
When first arm 31 rotates and comes into contact with support post 21, first arm 31 operates switch 22. A control unit (not shown) of power supply device B detects that switch 22 has been operated and that power supply-side terminal member 42 has come into contact with mobile body-side terminal member 85 (more precisely, that the positive electrodes of power supply-side terminal member 42 and mobile body-side terminal member 85 have come into contact with the negative electrodes of power supply-side terminal member 42 and mobile body-side terminal member 85), and after a process of checking continuity between power supply-side terminal member 42 and mobile body-side terminal member 85, if it is determined that there are no abnormalities that would cause problems during power supply, power is supplied to battery 76, which is a power storage device on mobile body A1 for charging. In addition, the power supply device B supplies DC power to the mobile body A1 to be charged via a conversion device (not shown) that converts AC power into DC power and a control unit (not shown) that monitors and controls the AC power and DC power, and supplies power to the mobile body A1 to be charged.

The storage position from the end of power supply will be explained.
When it is desired to move the mobile object A1 for charging from the power supply device B, the mobile object A1 for charging is advanced from the power supply section C toward the access road 12. To set the second arm 41 to the retracted position, the steps to start power supply described above are reversed. When the mobile object A1 for charging is advanced, the force pressing the first arm 31 toward the support section 21 is eliminated, and the first arm 31 is released from contact with the support section 21. In other words, the operation of the switch 22 by the first arm 31 is released, and at this point the control section terminates the power supply operation.

As the mobile object A1 moves forward further, the first arm 31 rotates toward the second arm 41, collapsing under its own weight. As the first arm 31 collapses, it approaches the second arm 41, as if drawn by the biasing member 35, until it is restricted by the restricting portion 33. As the mobile object A1 moves forward to charge, the first arm 31 is no longer supported from below, and so rotates downward under its own weight together with the second arm 41.

The second arm 41 passes through the slit 511 of the protective cover 51 on the way to the storage position, and assumes the storage position in which the power supply side terminal member 42 is located below the protective cover 51 and the shielding cover 52 .
The protective cover 51 and the shielding cover 52 cover the top of the power supply-side terminal member 42, so even if a foreign object falls from the mobile object A1 for charging moving on the mounting section 11, the foreign object will not easily adhere to the power supply-side terminal member 42. In addition, the slits 521 are also arranged to overlap, so that the slits 521 will not open and unintentionally form a gap, and therefore foreign object will not slip in through this gap and fall toward the power supply-side terminal member 42.

In addition, the contact surface 43 of the power supply terminal member 42 is positioned so that it slopes upward and slightly horizontally, allowing foreign matter on the contact surface 43 to fall along the slope. Therefore, the power supply terminal member 42 can be kept clean even after power is supplied, so there is no need to bother removing foreign matter the next time it is used, and power supply operations can be performed with reduced power supply failures caused by foreign matter.

The transition of the electrode cover 81 from the exposed state to the closed state will be described.
When it is desired to move the mobile object A1 for charging from the power supply device B, the mobile object A1 for charging is moved forward. To change the electrode cover 81 from the exposed state to the closed state, the above-described steps for changing from the closed state to the exposed state are reversed.

An elastic body 84 is provided at the pivot point 83 of the electrode cover 81, so even if the downward pressure from the inclined portion 64 is removed, the electrode cover 81 automatically rotates from the exposed state toward the closed state. As the mobile object A1 for charging is moved forward, the operating portion 82 moves upward while sliding on the inclined portion 64 and protrusion 63. When the support of the operating portion 82 by the inclined portion 64 and protrusion 63 is removed, the electrode cover 81 enters a completely closed state. In the closed state, the electrode cover 81 protects the mobile object side terminal member 85 from foreign objects such as surrounding dust, dirt, and obstacles, ensuring reliable power supply.

The mounting portion 11 is provided with a wheel portion H.
The wheel unit H includes a wheel 91 , a pivot shaft 92 , a base 93 , an inverting shaft 94 which is a horizontal shaft, and a mounting portion 95 .
The wheels 91 are provided on the mounting unit 11. The wheels 91 are capable of rolling while in contact with the ground. The wheels 91 can rotate invertedly around a horizontal axis, thereby switching the mounting unit 11 between a movable state and an installed state.

The wheel 91 includes a pivot 92. The pivot 92 is a vertical axis facing the vertical side that allows the orientation of the wheel 91 to be changed. The pivot 92 pivots around an axis that intersects with the mounting surface of the mounting unit 11.
The mounting portion 95 mounts the wheels 91 and also has the reversing shaft 94 .
The reversing shaft 94 is a horizontal shaft and can be switched between a ground contact state in which the wheels 91 are in contact with the ground and a ground non-contact state in which the wheels 91 are inverted.
The inverting shaft 94, which is a horizontal shaft, allows the power supply device B, with the wheel section H in the grounded state, to be freely movable.

The rotation shaft 92 can change the direction of the wheels 91, thereby changing the direction of travel of the movable power supply device B. The wheels H are configured as swivel casters, and when the wheels H are in the grounded state, the power supply device B can move freely in any direction, forward, backward, left, or right.
Because the direction of the wheels 91 can be freely changed, even if the towing vehicle A towing the power supply device B makes a sharp turn, including a turn on the spot, causing the power supply device B to swing suddenly in the direction of the rotation axis of the wheels 91, the wheels 91 can rotate about the turning axis 92 to change the direction in which the wheels 91 roll. Therefore, even if the towing vehicle A performs a towing operation that involves a sharp turn, the power supply device B will not fall into a state in which it is unable to follow the towing vehicle A.

1, bases 93 are provided on the outer left and right sides of the mounting portion 11, which is U-shaped in plan view. The bases 93 are members that are U-shaped in plan view, and are provided near the access path 12 of the mounting portion 11.
As shown in Figure 2, the mounting portion 95 is arranged so as to fit within the U-shaped interior of the base 93. An inversion shaft 94 is inserted into the base 93 and the mounting portion 95, and the mounting portion 95 is rotatable relative to the base 93 around the inversion shaft 94. By attaching the wheels 91 to the mounting portion 95, the wheels 91 can rotate up and down in an inverted manner. In this embodiment, the inversion shaft 94 faces in the same direction as the approach direction of the mobile object A1 to be charged relative to the power supply device B.

As shown in Figures 3 and 4, fixing holes 97 are provided in two locations: on the side of the reversing shaft 94 of the base 93, and on both sides of the reversing shaft 94 of the mounting part 95. By aligning the fixing hole 97 on the base 93 with one of the fixing holes 97 on the mounting part 95 and inserting a fixing pin 96, the rotation of the mounting part 95 relative to the base 93 can be fixed. In other words, when the wheels 91 are inverted upside down, they can be fixed in either a grounded state where the wheels 91 are in contact with the ground, or a state where the wheels 91 are inverted and not in contact with the ground.

As in this embodiment of the present invention, the wheel section H is configured to be inverted by the inverting shaft 94, which allows for a simple configuration without adding additional equipment for switching between the grounded and ungrounded states. Furthermore, by providing the wheel section H on the power supply device B, the installation location of the power supply device B can be freely changed, making it easy to change the installation location.

In the embodiment of the present invention, the pivot shaft 92 in the grounded state is fixed and maintained so as to be perpendicular to the mounting surface of the mounting portion 11, but the present invention is not limited to this example.
For example, the swivel shaft 92 in the grounded state may be inclined relative to the mounting surface of the mounting unit 11 so as to approach the towing vehicle A as it moves upward. By inclining the swivel shaft 92 in this way, even if the towing unit is lifted upward during towing and the power supply device B is in a tilted towed state, the swivel shaft 92 remains perpendicular to the ground, so no load is applied to the turning operation of the wheels 91, and the turning movement of the power supply device B is not hindered.

The reversal axis 94 does not necessarily have to be oriented in the same direction as the approach direction of the moving body A1 for charging, but may be oriented in a horizontal direction that intersects with the approach direction.
Although the wheel units H have been described as being provided on the outer side near the access path 12 of the mounting unit 11, they may also be disposed on the inner side of the mounting unit 11. In this case, the wheel units H do not protrude outside the power supply device B, so the power supply device B can pass through narrow places when traveling, the travel space required for traveling is small, and the range of locations where the power supply device B can be installed can be expanded.

Because the base 93 is located near the access road 12, the wheel section H is also located near the access road 12, and the traveling is stable when towing the power supply device B using the coupling F (described later) provided on the power supply unit C side opposite the access road 12 and the coupling F1 provided on the towing vehicle A side. Furthermore, even when the mobile unit A1 to be charged enters the access road 12 while not towing and the coupling F provided on the power supply unit B side is grounded, there is a sufficient distance between the wheels 91 and the power supply unit C, so the power supply device B does not enter a seesaw state, and the other end of the slope 13, which rotates around the horizontal shaft 18, can contact the installation surface. Therefore, even when the wheels 91 are grounded, the mobile unit A1 to be charged can easily enter the mounting section 11 of the power supply device B. Needless to say, the mobile unit A1 to be charged can also enter the mounting section 11 by flipping the wheels 91 over to a non-grounded state and grounding the underside of the mounting section 11. The wheel portion H, whether in a grounded state or a non-grounded state, is not located on the access path 12 or the placement surface, and therefore does not prevent the mobile object A1 from entering the placement portion 11 for charging.
The coupling part F on the towing vehicle A side, which is closer to the power feeding part C on the power feeding device B side, is longer and larger than the coupling part F1 of the towing vehicle A that tows the power feeding device B. Because the coupling part F is long, a sufficient distance can be maintained between the mobile body A, which is the towing vehicle, and the power feeding device B when coupled to the mobile body A, which is the towing vehicle. Therefore, when the power feeding device B coupled to the mobile body A, which is the towing vehicle, tries to turn in response to the turning motion of the towing vehicle A, inconveniences such as interference with the towing vehicle A do not occur. The coupling part F is provided so as to be detachable from the power feeding device B, or so as to be detachable from the loading platform G, which is detachable from the power feeding device B and will be described later. Further details of the coupling part F will be described later.

G is a loading platform. The loading platform G is a member having a rectangular shape in a plan view. The loading platform G is provided adjacent to the connecting part F, which is the end closer to the mobile body A that tows the power supply device B, and near the support part 21 provided at the end of the loading part 11. An item J can be placed on the loading platform G. The item J can also be a portable generator.
The loading platform G is arranged so as to be fixable between the placement sections 11 located on both sides of the detachable section, and is provided so as to be detachably attached to the placement sections 11.
The loading platform G can be located adjacent to the connecting portion F, which is the end closer to the mobile unit A. In this case, the loading platform G is located closer to the connecting portion F that connects the mounting portion 11. Therefore, even if a portable generator J is installed on the loading platform G, it will not obstruct the entry of the mobile unit A1 to be charged, which is entered from the access road 12 and placed on the mounting portion 11. Furthermore, since the loading platform G is located at the end closer to the mobile unit A, which is the towing vehicle, there is no limit to the size of the object J, such as a portable generator, that can be installed on the loading platform G. This makes it easier to achieve a weight balance with the mobile unit A1 to be charged, which is placed on the mounting portion 11. When the power supply device B is transported by the mobile unit A, which is the towing vehicle, a heavy portable generator J located closer to the connecting portion F provides better towing balance.
Reference numeral 111 denotes a first detachable part, and 112 denotes a second detachable part. The detachable part includes at least either the first detachable part 111 or the second detachable part 112, and constitutes a detachable part that detaches the connecting part F from the loading platform G or the power supply device B, or a detachable part that detaches the loading platform G from the power supply device B.
9, one end of the loading platform G is attached with the first detachable part 111 in contact with the end surface of the mounting part 11. Two locations on the first detachable part 111, one location on the side surface of one mounting part 11, and one location on the side surface of the other mounting part 11 are fastened together with fastening members 122 consisting of bolts and nuts.

The first detachable portion is provided at an end of the power supply device B near the support pillar 21 on the side opposite to the access road 12. The second detachable portion 112 is provided at an end of the loading platform G opposite to the side that contacts the first detachable portion 111.
The first detachable portion 111 is a member formed by projecting downward from the end of the base of the support portion 21 located between the one support portion 11 and the other support portion 11, which are the mounting surfaces. In this embodiment of the present invention, the base is made of a plate-like member 123, and is formed by bending the end downward. By attaching a connecting portion F to this first detachable portion 111, the power supply device B can be connected to the towing vehicle A via the connecting portion F and towed by the towing vehicle A. In another embodiment, a loading platform G may be provided separately near the support portion 21, and the end of this loading platform G opposite the support portion 21 may be used as the end of the power supply device B, and the second detachable portion 112 may be provided there.
The second detachable portion 112 is a member that protrudes downward from the other end of the loading platform G. In the present embodiment, the end is formed by bending downward. By attaching the connecting portion F to the second detachable portion 112, the power supply device B, which is equipped with the loading platform G, can be towed by a towing vehicle A connected to the connecting portion F.

When viewed from the side, the fastening position of the first detachable part 111 of the loading platform G and the fastening position of the mounting part 11 are fastened at a distance in a direction parallel to the direction in which the powered moving object A1 shown in Figure 12 enters the mounting part 11. Therefore, even if the loading platform G is positioned so that it overhangs the mounting part 11 and the detachable part, it is firmly fixed without shaking. Conversely, the fixation can be released by releasing the fastening member 122, and the loading platform G can be removed from the power supply device B.

The bottom surface of the loading platform G is spaced apart from the installation surface of the power supply device B. This allows the article J to be placed on the top surface of the loading platform G without being affected by the installation surface of the power supply device B.
On the upper surface of the loading platform G, a frame 121 is provided so as to surround the upper surface of the loading platform G. The frame 121 prevents the article J placed on the upper surface of the loading platform G from shifting or moving on the upper surface of the loading platform G and falling downward. The frame 121 in this embodiment is a U-shaped member in a plan view, and is disposed on both the left and right sides of the upper surface of the loading platform G in the direction of approach of the moving object A to be powered.

As shown in Figures 4, 8, 9, and 12, the frame 121 is movable and can be locked or unlocked by the adjustment unit 124, allowing the area enclosed by the frame 121 to be freely adjusted. The adjustment unit 124 is a plate-like member 123 that extends upward from the top surface of the loading platform G and has a long hole 128 that is long in the horizontal direction (left and right relative to the direction of entry of the moving object A1) adjacent to the side of the frame 121. The adjustment unit 124 has a fastening member 126 consisting of a knob bolt for fastening the frame 121 to the plate-like member 123. The frame 121 can be adjusted to the enclosed area 127 desired by the user by selecting any position within the long hole of the adjustment unit 124 and fastening the frame 121 with the fastening member 126. The adjustment unit 124 can variably adjust the enclosed area 127, which is the loadable area defined by the frame 121. In other words, the frame 121 can move left and right relative to the direction of entry of the mobile object A1 for charging, and can be fixed in place at the moved position, thereby changing the area that can be placed on the loading platform G. In this embodiment, the fastening members 126 are provided in four locations on the plate-shaped member 123, and each frame 121 can be fixed to the plate-shaped member 123 at two locations, front and back.

Fastening holes 125 are provided at the ends of the plate-like member 123 of the adjustment section 124. The fastening holes 125 can be used to hook or tie string-like objects such as ropes or rubber bands that are stretched over or around the item J placed on the loading platform G to prevent the item J from moving. In this embodiment, four fastening holes 125 are provided, each located near the four corners of the loading platform G.

An insertion portion 101 is formed at a portion of the coupling portion F provided on the power supply device B side that is attached to or detached from the first detachable portion 111 or the second detachable portion 112. The insertion portion 101 has a U-shaped portion in a side view with an open upper side. By inserting the insertion portion 101 into the first detachable portion 111 or the second detachable portion 112 from below, the forward/backward movement of the coupling portion F relative to the first detachable portion 111 or the second detachable portion 112 is restricted. Here, "forward/backward" refers to a direction parallel to the direction of entry of the mobile object A into the access path 12, or the towing direction of the coupling portion F provided on the power supply device B side. Since a large force is applied to the coupling portion F during towing, causing forward/backward movement, the insertion portion 101 is provided with sufficient strength. In the embodiment, the insertion portion 101 is provided with a wide width in the left/right direction to ensure strength.
By inserting a fixing member 102 consisting of a bolt and nut or a pin-shaped member into the first detachable portion 111, the second detachable portion 112 and the insertion portion 101, the connecting portion F can be prevented from moving up and down and left and right relative to the first detachable portion 111 and the second detachable portion 112.
In the embodiment, the fixing member 102 is provided in one location on the first detachable portion 111, the second detachable portion 112, and the insertion portion 101, and fixes the connecting portion F to the detachable portion consisting of either the first detachable portion 111 or the second detachable portion 112. When the connecting portion F is used for towing, the direction in which the greatest force is applied is the front-to-rear direction, and the forces moving in the up-down and left-to-right directions are very small compared to the front-to-rear direction. Therefore, in the embodiment, the fixing member 102 in one location is strong enough.

The coupling part F is provided on the power supply part C side of the power supply device B. F1 is a coupling part provided on the towing vehicle A side. The coupling part F is detachably provided on the first detachable part 111 or the second detachable part 112 and can be connected to the coupling part F1 of the towing vehicle A.
The connecting portion F provided on the power supply device B side is detachably attached to the mounting portion 11 on the side of the power supply device B near the support portion 21 of the power supply portion C. The connecting portion F provided on the power supply device B side can be connected to the mobile object A, which is the towing vehicle, or the mobile object A1 to be charged, via the connecting portion F1 provided on the towing vehicle A side, allowing the power supply device B to be towed and traveled.
The connecting portion F provided on the power supply device B side is detachably attached to the first detachable portion 111 or the second detachable portion 112, and can be provided on either the mounting portion 11 or the loading platform G.

The connecting portion F has an insertion portion 101 , a connecting hole 103 , a rotation restricting portion 105 which is a restricting portion, and a connecting pin 106 .
The coupling hole 103 couples the coupling portion F1 of the moving body A, which is a towing vehicle, with a coupling pin 106. The turning restrictor 105 restricts the coupling angle between the moving body A, which is a towing vehicle, and the power supply device B being towed.
The turning restriction part 105 is provided on the side away from the insertion part 101 of the connecting part F. The turning restriction part 105 is provided near the connecting hole 103. The turning restriction part 105 can be configured simply and easily to regulate the bending angle between the mobile unit A and the connecting part F that occurs when the mobile unit A, which is the towing vehicle, turns. Note that the bending angle in the explanation may also be referred to as the towing angle, connecting angle, tilt angle, or relative angle.

A folded portion 16 is formed in the insertion portion 101. The surface of this folded portion 16 contacts the lower surface of the upper plate member of the first detachable portion 111 and the second detachable portion 112, which are formed to protrude as much as possible, thereby supporting the connecting hole 103 side of the connecting portion F provided in the first detachable portion 111 or the second detachable portion 112 so as not to rotate up and down.
Thanks to the insertion portion 101 and the folding portion 16, the connecting portion F can be fixed integrally to the first detachable portion 111 or the second detachable portion 112 even though the fixing member 102 is fixed at one point, and is sufficient to withstand the load in the forward and backward directions when towing. Furthermore, because the fixing member 102 is fixed at one point, it can be easily attached and detached. Because the connecting portion F can be attached and detached to the power supply device B or the cargo bed G as desired, the power supply device B can be easily configured as desired by the user.

The connecting hole 103 is aligned with the connecting hole 104 of the connecting part F1 on the towing vehicle mobile unit A, and the connecting pin 106 is inserted to connect the power supply device B to the towing vehicle mobile unit A. The power supply device B can freely tilt and swing left and right relative to the direction of travel, with the connecting pin 106 as the axis, relative to the towing vehicle mobile unit A. Furthermore, the connecting hole 104 on the towing vehicle mobile unit A side has a larger diameter than the connecting hole 103 of the connecting part F on the power supply device B side, so the power supply device B and the towing vehicle mobile unit A can freely tilt and swing relative to each other in the vertical direction. This allows the power supply device B to perform normal towing operations involving left and right turns, as well as follow the ground and follow the towing vehicle mobile unit A ahead, even when traveling on a surface with vertical undulations.

The turning restriction section 105, which is a restriction section, is provided at the coupling section F. The turning restriction section 105 is capable of restricting the towing angle relative to the towing vehicle A.
When the towing vehicle, i.e., the mobile body A, and the coupling part F are coupled, the rotation control part 105, which is a control part, comes into contact with the abutment surface 107 provided on the coupling part F1 provided on the towing vehicle, i.e., the mobile body A, thereby controlling the coupling angle, which is the relative inclination angle in a plan view, between the towing vehicle, i.e., the mobile body A, and the coupling part F1.
The towing vehicle, which is the moving body A, can turn both to the left and right with respect to the traveling direction between a straight-ahead state in which the moving body A and the power supply device B are arranged parallel to each other and a position where the coupling angle is restricted. The restricting unit 105 can prevent interference between the power supply device B and the moving body A that occurs when the relative angle between them becomes too large.

When power supply device B in the towing state is restricted in relative angle by restricting unit 105 while turning, contact surface 107 of mobile unit A (the towing vehicle) presses restricting unit 105 in the opposite direction of the turning direction. In other words, coupling unit F of power supply device B is pushed outward relative to the turning direction, causing power supply device B to swing left and right relative to the direction of travel. At this time, wheel unit H, which has wheels 91 that can swivel around a vertical axis, points wheels 91 in the other direction of the left and right swing, so power supply device B is towed by mobile unit A (the towing vehicle) while avoiding interference with the towing vehicle.

Towing may be performed by towing an empty power supply device B using a mobile body A with a first mobile body as a towing vehicle, or by towing a power supply device B loaded on a mounting section 11 at a power supply position as a mobile body A1 for charging the first mobile body using a mobile body A with a second mobile body as a towing vehicle.
By integrally attaching a portable generator, which is an item J, to the loading platform G attached to the power supply device B, the mobile body A, which is a towing vehicle, can supply power to the power supply device B while towing, and can also tow while supplying power to the mobile body A1 for charging, which is loaded at a power supply position.

J is a portable generator. K is a power supply control unit.
The portable generator J is placed and fixed on a loading platform G which is fixed to the power supply device B. Therefore, the portable generator J is integrated with the power supply device B, and can be moved together with the power supply device B.
A connection cord 131 connects the object J, which is a portable generator, to the power supply control unit K, or connects the power supply control unit K to a power take-out unit of a commercial AC power source.

The portable generator J outputs AC power to the power supply control unit K.
After obtaining AC power, the power supply control unit K converts the AC power into DC power to supply DC power to the power supply side terminal member 42 .
The power supply control unit K acquires AC power, converts it into DC current, and then supplies power (DC power) to a mobile object A1 to be charged, which is the power receiving side, with the power receiving unit D in contact with the power supply unit C of the power supply device B.
The power supply control unit K starts the power supply operation after the mobile terminal member 85 of the power receiving unit D comes into contact with the power supply side terminal member 42 of the power supply unit C and the switch 22 provided near the power supply side terminal member 42 is operated by the mobile unit A1 to charge the device.

The power supply operation includes a continuity confirmation process in which a test current that is smaller than the supply current (charging current) is applied to the battery 76, which is a power storage device possessed by the mobile object A1 to be charged, to test the battery 76, which is a power storage device.

The power source acquired by the power supply control unit K may be any AC power source, and the power used for power supply is secured by selectively selecting either a commercial AC power source or AC power generated by a portable generator J. The commercial AC power source and AC power generated by the portable generator J described in the embodiment of the present invention are single-phase AC power sources of 100 to 240 V. The portable generator J generates electric power using power generated by an internal combustion engine.
Since the power source can be selected from two systems, commercial AC power and power generated by the portable generator J, in an environment where commercial AC power can be secured, the commercial AC power can be connected to the power supply control unit K with a connection cord 131 to supply power (DC power) to the mobile body A1 to be charged. On the other hand, in an environment where commercial AC power cannot be secured, power generated by the portable generator J can be connected to the power supply control unit K with a connection cord 131 to supply power (DC power) to the mobile body A1 to be charged.

The power supply control flow diagram shown in FIG. 13 will be described.
In S1, the power supply control unit K, which has secured the AC power supply, determines whether the switch 22 is pressed or not. That is, after the mobile object A1 to be charged enters the portable generator J, it determines whether the mobile object A1 is located at a designated position where power can be supplied.

If it is determined in S1 that switch 22 is pressed, it is determined that the mobile object is located at the designated position, and in S2, a test current, which is a weak current compared to the charging current described below, is applied to power supply unit C. In the power supply device B of the present invention, power supply unit C is already connected to power receiving unit D of mobile object A1 to be charged when the mobile object A1 to be charged is located at the designated position.
If the switch 22 is not pressed, the process returns to S1 again, and the process of detecting whether the switch 22 is pressed is repeated.

In S2, a test current is applied to the power supply unit C. In S3, the power supply control unit K determines whether the voltage detected by the application of the test current is within a preset voltage range. In other words, it determines whether the battery 76, which is a power storage device connected to the power receiving unit D connected to the power supply unit C, is within a preset voltage range.

In S3, the power supply control unit K applies the test current to determine whether the detected voltage is within a preset voltage range. If the detected voltage of the battery 76 (power storage device) is within the preset range, in S4 the power supply control unit K applies a charging current to the power supply unit C that is capable of charging the battery 76 (power storage device). The battery 76 (power storage device) connected to the power supply unit C via the power receiving unit D receives power and is charged.

In S3, if the power supply control unit K determines that the detected voltage of the battery 76, which is the power storage device, is not within the set range, it performs error processing and terminates the processing related to power supply.
In an embodiment of the present invention, examples of cases in which the voltage of the battery 76, which is a power storage device, is determined to be outside the set range include cases in which the battery 76, which is a power storage device, is unable to detect a voltage within the normal range due to over-discharging or over-charging of the battery 76, or poor connection between the power supply unit C and the power receiving unit D, etc.

In S4, a charging current is applied to the power supply unit C. In S5, the power supply control unit K determines whether charging of the battery 76, which is a power storage device, has progressed and whether the voltage of the battery 76, which is a power storage device, is equal to or higher than a predetermined voltage.
If the voltage is below the predetermined voltage as determined in S5, the charging current continues to be applied to the power supply unit C. If the voltage is equal to or higher than the predetermined voltage, the power supply control unit K gradually reduces the charging current in S6.

After the power supply control unit K performs the process of gradually decreasing the charging current in S6, the power supply control unit K determines in S7 whether the gradually decreasing charging current has decreased to a specified value or less.
If the power supply control unit K determines in S7 that the gradually decreasing charging current has fallen below a specified value, it proceeds to S8, where it determines that charging has been completed, and ends the power supply operation.
On the other hand, if the power supply control unit K determines in S7 that the gradually decreasing charging current is not equal to or less than the specified value, it repeats the process of decreasing the charging current.

The above control flow applies not only when the portable generator J is connected to the power supply control unit K, but also when the power supply control unit K acquires commercial power.

A Mobile object (tow vehicle)
A1: Mobile body to be charged; B: Power supply device F: Connection portion G: Carrying platform 11: Placement portion 42: Power supply side terminal member 85: Mobile body side terminal member 91: Wheel 92: Swivel shaft

Claims (4)

A power supply device having a power supply side terminal member that contacts a movable body side terminal member of a movable body to supply power to the movable body,
the power supply device includes a mounting portion on which the moving body can climb;
a loading platform on which an article can be placed, the loading platform being detachably and fixably provided on the loading section;
Equipped with
The loading platform includes a frame that defines a loading area,
The frame has an adjustment unit that can changeably adjust the mounting area defined by the frame;
A power supply device comprising: a connecting portion that is detachably provided on the loading platform and that can be connected to a towing vehicle;
2. The power supply device according to claim 1, further comprising: a connecting portion that is detachably attached to the loading platform and can be connected to a towing vehicle;
a turning restriction part that can restrict the towing angle relative to the towing vehicle;
The power supply device according to claim 1, further comprising: a connecting portion that is detachably attached to the loading platform and can be connected to a towing vehicle;
The power supply device according to claim 1 , wherein the loading platform is provided closer to the connecting portion.