JP7728575B2 - Carts and Storage Units - Google Patents

Description

The present invention relates to a cart that can be charged wirelessly and a storage unit that stores the cart.

In systems where shoppers register products themselves using devices such as smartphones or tablets, shopping carts are sometimes equipped with batteries to charge the devices.

Japanese Patent Application Laid-Open No. 2020-068553

In this regard, it is possible to consider contactless charging of cart batteries while multiple carts are stored at a gate, as in the power supply system described in Patent Document 1. Contactless charging requires accurate positioning of the power receiving device relative to the power transmitting device, but when mounting the power receiving device on the cart, accurate positioning is difficult due to manufacturing errors in the cart frame itself.

The present invention therefore aims to provide a cart and storage unit that can be charged contactlessly while in a stored state.

To achieve the above objective, the cart of the present invention has a frame forming a main body and wheels attached to the lower part of the frame. It is a cart that can be stacked in the front-to-back direction when stored, and is equipped with a mounting member fixed to the frame, and a power receiving device that is fixed to the mounting member and receives power in a non-contact manner. When two carts are stored stacked in the front-to-back direction, the mounting member of one cart abuts against the mounting member of the other cart in the front-to-back direction, without the frame of the one cart abutting against the frame of the other cart in the front-to-back direction.

1A to 1D are diagrams showing a cart according to an embodiment of the present invention, in which (a) is an external perspective view, (b) is a front view, (c) is a side view, and (d) is a plan view. 1A and 1B are diagrams showing an example of a device attached to a cart according to an embodiment of the present invention, in which (a) is an external oblique view of the cart to which the device is attached, (b) is a front oblique view of the device, and (c) is a rear oblique view of the device. 1A and 1B are diagrams showing a state in which one cart is stored in a storage unit in this embodiment, in which (a) is an external perspective view and (b) is a plan view. 1A and 1B are diagrams showing a state in which two carts are stored in a storage unit in this embodiment, in which (a) is an external perspective view and (b) is a plan view. 1A and 1B are diagrams showing a storage unit according to an embodiment of the present invention, in which (a) is an external oblique view seen from the right side in the storage direction of the cart, (b) is an external oblique view seen from the left side in the storage direction of the cart, and (c) is a plan view.

Overview A cart 1 according to an embodiment of the present invention and a storage unit 6 capable of storing the cart 1 will be described below with reference to the drawings.
The cart 1 according to this embodiment shown in FIG. 1 is a so-called shopping cart, and a user such as a shopper can place products or a shopping basket filled with products in the cart 1 and move it around a store or the like.

The cart 1 is equipped with a battery 10, and the power of the charged battery 10 can be used in various ways.
2 shows an example of using electric power, in which a tablet terminal 8 is attached to the cart 1. In this example, a charging cable 9 is connected from a battery 10 to a charging port 83 of the tablet terminal 8. When application software is executed on the tablet terminal 8, information is displayed on the LCD screen 81, and product registration operations can be performed. In addition, the attached handheld scanner 82 can read product barcodes, etc.

2(a) , the charging cable 9 may be fixed to the frame 2 by using a suitable fastener or the like so that the charging cable 9 is routed along the frame 2. In this case, it is possible to prevent the charging cable 9 from becoming tangled or caught on something.
The handheld scanner 82 may also be held with its reading section facing downward or forward (toward the user, such as a shopper). In this case, the user can register the product by holding the barcode of the product over the reading section of the handheld scanner 82 without holding the handheld scanner 82 in their hand.

In another example of using electric power, a stand on which a mobile phone terminal such as a smartphone can be placed is attached to the cart 1, and power is supplied to the mobile phone terminal placed on the stand. In this example, the mobile phone terminal can be charged by connecting a predetermined charging cable 9 from the battery 10 to the mobile phone terminal. When registering products using application software installed on the mobile phone terminal, power can be continuously supplied to the mobile phone terminal while shopping.
However, the uses of the electricity stored in the battery 10 are not limited to these, and it can also supply electricity to devices and equipment equipped on the cart 1, such as the power source for driving the cart 1 and lighting.

3 and 4, the power of the battery 10 used in this manner can be charged by contactless power supply when stored in the storage unit 6. That is, the cart 1 is provided with a power receiving device 5, while the storage unit 6 is provided with a power transmitting device 7, and when the cart 1 is stored in the storage unit 6, the power receiving device 5 and the power transmitting device 7 are positioned in a manner that allows for contactless charging.
As a result, power is supplied from the battery 10 to the tablet terminal 8 etc. while shopping using the cart 1, and when shopping is finished and the cart 1 is stored in the storage unit 6, the battery 10 is charged.

In the following description, the direction in which a shopper holds the handle 23 and pushes the cart 1 forward will be referred to as the forward direction, and the opposite direction will be referred to as the backward direction.
Further, although it is assumed here that the user of the cart 1 is a shopper, in implementing the present invention, the user of the cart 1 is not limited to a shopper, and may be a store clerk or the like.
Furthermore, the cart 1 is expected to be used in shopping malls, supermarkets, etc., but the places where it can be used are not limited to these places.

Cart 1
As shown in FIG. 1, the cart 1 is composed of a frame 2, wheels 33, a mounting member 4, and a power receiving device 5, and the cart 1 is equipped with a battery 10.

The frame 2 is composed of a pair of support pillars 21, 22 extending in the vertical direction, a handle 23 connecting the upper ends of the pair of support pillars 21, 22, a first basket support portion 24 provided near the middle of the support pillars 21, 22, and a second basket support portion 25 provided at the lower ends of the support pillars 21, 22, and forms the main body of the cart 1.
The frame 2 is made of a highly rigid material such as iron, stainless steel, or metal such as aluminum, but the material is not limited to these in the practice of the present invention.

The pair of support posts 21, 22 are arranged facing each other in the width direction, and each consists of a rod-shaped member bent in a V-shape at a predetermined point, with a length extending approximately vertically.

The handle 23 is made of a rod-shaped steel material and connects the upper ends of the pair of support columns 21, 22. The user can grasp this handle 23 and push the cart 1 in the desired direction.

The first basket support portion 24 is located approximately in the middle of the pair of support columns 21, 22 and is used to place a shopping basket. This first basket support portion 24 is composed of a bottom support portion 241 that supports the shopping basket from the bottom side, and a rear support portion 242 that supports the rear of the shopping basket supported on the bottom support.

The bottom support portion 241 is inclined so that its front is higher than its rear, causing a shopping basket placed on this bottom support portion 241 to assume a backward-leaning position. The rear support portion 242 is composed of a rod-shaped member suspended between a pair of support columns 21, 22, and supports the shopping basket from behind when it assumes a backward-leaning position on the bottom support portion 241. This stabilizes the shopping basket placed on the first basket support portion 24.

The bottom support portion 241 is also inclined so that the front is higher than the rear, and is gradually narrower from the rear to the front. This prevents the first cart support portions 24 of the front and rear carts 1 from interfering with each other when the carts 1 are stacked and stored in the front-to-rear direction.

The second basket support portion 25 is a portion below the cart 1 on which a shopping basket is placed. This second basket support portion 25 has a generally trapezoidal shape in plan view and is located directly below the first basket support portion 24, protruding forward of the support portions 21 and 22.

The second car support portion 25 is configured so that its width gradually narrows from the rear to the front. The height of the second car support portion 25 also gradually decreases from the rear to the front. This prevents the second car support portions 25 of the front and rear carts 1 from interfering with each other when the carts 1 are stacked and stored in the front-to-rear direction.

A shock absorber 251 made of plastic or other material is attached to the front of the second car support section 25. This cushions the impact when the lower part of the cart 1 collides forward with an object and prevents objects from getting caught in the front wheels 33-1.

Wheels 33 are provided on the lower part of the frame 2, on the underside of the second car support part 25, for moving the cart 1 on the floor surface.
The wheels 33 are made up of a pair of front wheels 33-1 and a pair of rear wheels 33-2 provided at the front and rear, and rotate in accordance with the direction in which the user pushes or pulls the cart 1.

Mounting member 4
The mounting member 4 is a plate-like member having a substantially triangular shape that is provided on the cart 1, and has a power receiving device 5 fixed thereto.
The mounting member 4 is fixed to one of the support posts 21 on the side of the cart 1. Furthermore, the mounting member 4 is fixed to the support post 21 so that the surface on which the power receiving device 5 is attached faces outward in the width direction of the cart 1.

The mounting member 4 has a fixed length in the front-to-rear direction, and as shown in Figure 4, when multiple carts 1 are stored stacked one behind the other, the mounting member 4 of one of the two stacked carts 1 abuts the mounting member 4 of the other cart 1 in the front-to-rear direction. At this time, the frame 2 of one cart 1 and the frame 2 of the other cart 1 do not abut against each other in the front-to-rear direction. As a result, the positional relationship in the front-to-rear direction of the two stacked carts 1 is determined by the length of the mounting member 4 in the front-to-rear direction and is not dependent on the shape or manufacturing error of the frame 2.

The shape of the mounting member 4 may be configured in other ways as long as the front and rear ends of the carts 1 abut against each other when the carts 1 are stored one behind the other.
Furthermore, the wiring and the like of the power receiving device 5 can be protected and the appearance can be improved by providing the wiring and the like inside the mounting member 4. Furthermore, the mounting member 4 may be formed in a thin box shape so that the wiring and the like can be housed inside.

In addition, to ensure that the mounting members 4 of the carts 1 stored in the storage unit 6 abut against each other without any separation and that the power receiving devices 5 are lined up at a fixed interval, magnets or locking structures may be provided at the points where the mounting members 4 abut, thereby maintaining the abutting state of the mounting members 4 of the front and rear carts 1. This can also be achieved by providing the storage unit 6 with a member that can fix the wheels 33 when the front and rear carts 1 are abutting, or by providing a biasing means that biases the stored carts 1 from rear to front.

Power receiving device 5
The power receiving device 5 is a device for receiving power wirelessly from the power transmitting device 7 provided in the storage unit 6, and is fixed to the outside of the mounting member 4. The power receiving device 5 is composed of a power receiving coil that receives power transmitted from the power transmitting coil of the power transmitting device 7, a control circuit, etc., and supplies power to the battery 10 via a predetermined power cable.
The method of contactless power supply is, for example, an electromagnetic induction method, but is not limited to this, and any method can be adopted.

This power receiving device 5 is fixed to a predetermined position in the fore-and-aft direction of the mounting member 4, using the front or rear end of the mounting member 4 as a reference. In other words, when multiple carts 1 are stored stacked one behind the other, the rear end of the mounting member 4 of the front cart 1 abuts against the front end of the mounting member 4 of the rear cart 1, and since the power receiving device 5 is attached to the mounting member 4 using the front or rear end of the mounting member 4 as a reference, the installation distance between the power receiving devices 5 on the front and rear carts 1 is determined by the fore-and-aft length of the abutting front and rear mounting members 4.

Furthermore, the power receiving device 5 has a shape that tapers relative to the fence members 61, 62 in a direction away from the mounting surface. This causes the power receiving device 5 to have an inclined surface in the front-to-rear direction of the cart 1. As a result, for example, when the cart 1 is being moved, even if the power receiving device 5 collides with something while passing by, the inclined surface prevents direct impact and allows the impact to be dissipated. The power transmitting device 7, which will be described later, is also configured in a similar manner, with an inclined surface in the front-to-rear direction of the cart 1. This allows the inclined surfaces of the power transmitting device 7 and the power receiving device 5 to dissipate the impact even if the power receiving device 5 and the power transmitting device 7 collide when the cart 1 is pushed into the storage unit 6 for storage.
In this embodiment, the power transmitting device 7 and the power receiving device 5 are configured in a truncated quadrangular pyramid shape, but they may also be configured in a truncated cone shape or other shape with curved corners.

●Storage unit 6
In the storage unit 6 shown in FIG. 5, a plurality of carts 1 can be stored in a stacked manner in the front-to-rear direction.
This storage unit 6 includes fence members 61 and 62, stopper members 611 and 621, regulating members 612 and 622, and a power transmission device 7.
In this embodiment, the storage unit 6 is capable of storing the cart 1, and includes storage cabinets, storage devices, gates, cart power supply devices, etc., regardless of their names, as long as they have a similar configuration.

The fence members 61, 62 are plate-shaped members whose length extends in the front-to-rear direction of the stored cart 1, and are provided in pairs on both sides of the stored cart 1.

Stopper members 611 and 621 are provided in front of the fence members 61 and 62, protruding inward.
The stopper member 611 is provided at a height corresponding to the height at which the mounting member 4 of the cart 1 is provided. As shown in Figure 3, when the carts 1 are stored in the storage unit 6 along the fence members 61, 62, the front end of the mounting member 4 of the leading cart 1 abuts against the stopper member 611.
Furthermore, the stopper member 611 is provided a predetermined distance behind the ends of the fence members 61, 62 so that the tip of the leading cart 1 stored in the storage unit 6 fits within the storage unit 6. In other words, this predetermined distance is equal to or longer than the distance from the front end of the mounting member 4 to the front end of the cart 1 in the front-to-rear direction of the cart 1. Note that, regardless of this embodiment, contactless power supply is possible even if the tip of the leading cart 1 protrudes forward from the storage unit 6, and this configuration may also be used in other embodiments.

When the carts 1 are stored in the storage unit 6 along the fence members 61, 62, the frame 2 of the leading cart 1 abuts against the stopper member 621.
Here, the stopper members 611, 621 are provided so that when the leading cart 1 is stored upright in the storage unit 6, the mounting member 4 abuts against the stopper member 611 on the left side as viewed from the direction of entry of the cart 1, and the frame 2 of the cart 1 abuts against the stopper member 621 on the right side. As a result of the stopper members 611, 621 being provided in this manner, the leading cart 1 stored in the storage unit 6 can maintain a straight posture without tilting left or right in a plan view.

A plurality of power transmission devices 7 are provided inside one of the fence members 61 and 62, that is, the fence member 61.
The power transmitting device 7 is a device that supplies power to the power receiving device 5 of the cart 1 in a contactless manner, and includes a power transmitting coil, a control circuit, etc., and is connected to an external power source.

The power transmission devices 7 are provided along the front-to-rear direction at intervals corresponding to the length of the mounting member 4 of the cart 1 in the front-to-rear direction. That is, as shown in Fig. 4 , the power transmission devices 7 are provided at intervals similar to the intervals between the power receiving devices 5 lined up in the front-to-rear direction when multiple carts 1 are stacked and stored in the storage unit 6. The forward-most power transmission device 7 among the multiple power transmission devices 7 is provided behind the stopper member 611 by a distance corresponding to the distance from the front end of the mounting member 4 of the cart 1 to the position where the power receiving device 5 is attached.
As a result, when the carts 1 are stored in the storage unit 6 one behind the other, the power transmitting device 7 and the power receiving device 5 face each other, enabling contactless power supply.

Furthermore, like the power receiving device 5 described above, the power transmitting device 7 has a shape that tapers relative to the fence member 61 in the direction away from the mounting surface. As a result, the surfaces of the power transmitting device 7 are inclined in the length direction of the fence members 61, 62, or in the front-to-rear direction of the cart 1 stored in the storage unit 6. As a result, even if the power receiving device 5 and the power transmitting device 7 collide when the cart 1 is stored in the storage unit 6, the inclined surfaces of the power transmitting device 7 and the power receiving device 5 can dissipate the impact.

The pair of fence members 61, 62 are provided with restricting members 612, 622, respectively, that restrict the left-right movement of the cart 1 stored along the fence members 61, 62.
The restricting members 612, 622 are both rod-shaped members that are long in the front-to-rear direction of the cart 1 stored in the storage unit 6, and are provided to protrude from the inside of the fence members 61, 62. Furthermore, the restricting members 612, 622 are provided at a height that does not interfere with the wheels 33 of the cart 1.

Of the pair of restricting members 612, 622, the restricting member 612 provided on the fence member 61 on the side where the power transmission device 7 is provided is provided so that it protrudes further toward the cart 1 than the power transmission device 7 on at least the inside of the fence member 61. As a result, even if the cart 1 is biased toward the fence member 61, the restricting member 612 abuts against the frame 2 or mounting member 4 of the cart 1, preventing a collision between the power transmission device 7 and the power receiving device 5. However, the degree of protrusion of the restricting member 612 is such that it does not prevent the power transmission device 7 and the power receiving device 5 from coming close enough to each other to allow wireless power transfer.

The restricting member 622 provided on the fence member 62 on the side where the power transmission device 7 is not provided restricts the distance between the power transmission device 7 and the power receiving device 5. In other words, this restricting member 622 can prevent the cart 1 from leaning toward the fence member 62 side and the power transmission device 7 and the power receiving device 5 from being separated by a distance greater than the distance at which wireless power supply is possible.
This pair of regulating members 612, 622 allows the positional relationship between the cart 1 stored in the storage unit 6 and the fence members 61, 62 to maintain a distance appropriate for contactless power supply between the power receiving device 5 and the power transmitting device 7.

Storage State The cart 1 having the above-described configuration can be stored in a storage unit 6 as shown in FIGS.
When a cart 1 is stored in the storage unit 6 from a state where no carts 1 are stored therein as shown in Fig. 3, the mounting member 4 of the cart 1 comes into contact with the stopper member 611. When the mounting member 4 and the stopper member 611 come into contact with each other, the power receiving device 5 and the power transmitting device 7 face each other, enabling contactless charging.
When storing the cart 1 in the storage unit 6, the lateral movement of the cart 1 is restricted by the restricting members 612 and 622. As a result, the cart 1 is stored in the storage unit 6 at a distance appropriate for the power receiving device 5 and the power transmitting device 7 to supply power contactlessly.

When a cart 1 is already stored and another cart 1 is subsequently stored as shown in Figure 4, the other cart 1 is stored with the mounting members 4 of the two carts abutting against each other.
As described above, the first car support portion 24 is configured so that the bottom support portion 241 is inclined so that the front is higher than the rear and so that the width gradually narrows from the rear to the front, so that the first car support portions 24 of the front and rear carts 1 do not interfere with each other. Similarly, the second car support portion 25 is configured so that the width gradually narrows from the rear to the front and the height gradually decreases from the rear to the front, so that the second car support portions 25 of the front and rear carts 1 do not interfere with each other. As a result, the frames 2 of the front and rear carts 1 do not interfere with each other, and the front and rear ends of the mounting members 4 of the front and rear carts 1 abut against each other.

The power transmission devices 7 are installed along the front-to-rear direction at intervals corresponding to the length of the mounting member 4 of the cart 1 in the front-to-rear direction. Therefore, when a rear cart 1 abuts its mounting member 4 against the mounting member 4 of the leading cart 1, the power receiving device 5 of the rear cart 1 also faces the power transmission device 7, enabling contactless power supply to the rear cart 1 as well.

With the cart 1 and storage unit 6 according to the present embodiment described above, when the carts 1 are not in use, they can be stacked and stored in the storage unit 6 while the battery 10 is being charged. In this case, the front and rear carts 1 are in contact only with the mounting members 4, so the power receiving devices 5 of the stored carts 1 can be spaced apart and face the power transmitting device 7 at a constant interval, regardless of manufacturing errors in the bending process or the frame 2 made of joined multiple members. In particular, when many carts 1 are stored stacked, even if the leading cart 1 can be positioned properly, errors tend to accumulate in the rear carts 1, causing misalignment. However, in this embodiment, the front and rear positions are determined by the mounting members 4, so the rear carts 1 can also be accurately positioned.
Furthermore, compared to a method in which the power receiving device 5 is positioned by the wheels 33, for example, there is no need to provide a step on the floor surface, and the cart 1 can be easily taken in and out.

In the above embodiment, a lamp may be provided to indicate whether the battery 10 is being properly charged by the contactless power supply between the power receiving device 5 and the power transmitting device 7 when the cart 1 is stored in the storage unit 6. The lamp may be provided on the cart 1 or on each power transmitting device 7 of the storage unit 6. The color or pattern of the light emitted by the lamp may be changed depending on the charging state.
● Overview of implementation

The present invention relates to a cart that can be charged wirelessly and a storage unit that stores the cart.

In systems where shoppers register products themselves using devices such as smartphones or tablets, shopping carts are sometimes equipped with batteries to charge the devices.

In this regard, it is possible to consider contactless charging of cart batteries while multiple carts are stored at a gate, as in the power supply system described in JP 2020-068553 A. Contactless charging requires accurate positioning of the power receiving device relative to the power transmitting device, but when mounting the power receiving device on the cart, accurate positioning is difficult due to manufacturing errors in the cart frame itself.

The present invention therefore aims to provide a cart and storage unit that can be charged contactlessly while in a stored state.

To achieve the above objective, the cart of the present invention has a frame forming a main body and wheels attached to the lower part of the frame. It is a cart that can be stacked in the front-to-back direction when stored, and is equipped with a mounting member fixed to the frame, and a power receiving device that is fixed to the mounting member and receives power in a non-contact manner. When two carts are stored stacked in the front-to-back direction, the mounting member of one cart abuts against the mounting member of the other cart in the front-to-back direction, without the frame of the one cart abutting against the frame of the other cart in the front-to-back direction.

The power receiving device may be fixed to a predetermined position in the fore-and-aft direction of the mounting member, based on the front or rear end of the mounting member.

The power receiving device may have an inclined surface in the fore-and-aft direction of the cart.

The storage unit in which the cart is stored is characterized by including a plurality of power transmission devices arranged along the front-to-rear direction at intervals corresponding to the length of the mounting member in the front-to-rear direction, and which supply power to the power receiving device in a non-contact manner.

The system may further include a pair of fence members having a length in the front-to-rear direction of the cart and provided on both sides of the cart, and a stopper member provided on the fence members and against which the front end of the mounting member of the leading cart among the carts stored along the fence members abuts, and the forwardmost power transmission device of the plurality of power transmission devices may be provided rearward of the stopper member by a distance corresponding to the distance from the front end of the mounting member of the cart to the position where the power receiving device is attached.

The system may further include a pair of restricting members provided on each of the pair of fence members to restrict left-right movement of a cart stored along the fence members, and the restricting members may be provided at a height that does not interfere with the wheels.

The power transmission device may be provided inside one of the fence members, one of the regulating members may be provided inside the fence member on the side where the power transmission device is not provided to regulate the separation between the power transmission device and the power receiving device, and the other regulating member may be provided inside the fence member on the side where the power transmission device is provided, protruding toward the cart beyond the power transmission device to regulate the collision between the power transmission device and the power receiving device.

With the carts and storage units according to the above-described embodiments of the present invention, when the carts are not in use, they can be stacked and stored within the storage unit while their batteries are being charged. In this case, the front and rear carts only come into contact with each other through the mounting members, so the power receiving devices of the multiple stored carts can be positioned at a consistent distance from each other and face the power transmitting device, regardless of manufacturing errors in bending or frames made from joined multiple members. In particular, when storing multiple carts stacked together, even if the leading cart can be positioned properly, errors can accumulate in the rear carts, causing misalignment. However, in this embodiment, the front and rear positions are determined by the mounting members, so the rear carts can also be positioned accurately.

REFERENCE SIGNS LIST 1: Cart 2: Frame 21: Support portion 22: Support portion 23: Handle 24: First car support portion 25: Second car support portion 33: Wheel 4: Mounting member 5: Power receiving device 6: Storage unit 61, 62: Fence member 611, 621: Stopper member 612, 622: Restricting member 7: Power transmitting device

Claims (7)

A cart having a frame forming a main body and wheels provided on the lower part of the frame, which can be stacked in the front-to-rear direction for storage,
a mounting member fixed to the frame;
a power receiving device fixed to the mounting member and receiving power in a non-contact manner,
The mounting member of one of two carts stacked one behind the other for storage abuts against the mounting member of the other cart in the front-to-rear direction without the frame of the one cart abutting against the frame of the other cart in the front-to-rear direction.
A cart characterized by:
The power receiving device is fixed to a predetermined position in the front-rear direction of the mounting member, with the front end or the rear end of the mounting member as a reference.
10. The cart of claim 1.
the power receiving device has an inclined surface in the front-rear direction of the cart;
3. A cart according to claim 1 or 2.
A storage unit for storing the cart according to any one of claims 1 to 3,
a plurality of power transmission devices provided along the front-rear direction at intervals corresponding to the length of the mounting member in the front-rear direction, the power transmission devices supplying power to the power reception device in a non-contact manner;
A storage unit characterized by:
A pair of fence members each having a length in the front-rear direction of the cart and provided on both sides of the cart;
a stopper member provided on the fence member and against which a front end of the mounting member of a leading cart among the carts stored along the fence member abuts,
the power transmitting device provided at the front end of the plurality of power transmitting devices is provided rearward of the stopper member by a distance corresponding to a distance from a front end of the mounting member of the cart to a position where the power receiving device is attached;
The storage unit of claim 4.
a pair of restricting members provided on each of the pair of fence members to restrict left-right movement of a cart stored along the fence members;
The regulating member is provided at a height that does not interfere with the wheel.
6. The storage unit according to claim 4 or 5.
The power transmission device is provided inside one of the fence members,
one of the restricting members is provided inside the fence member on the side where the power transmitting device is not provided and restricts the separation between the power transmitting device and the power receiving device;
the other restricting member is provided inside the fence member on the side where the power transmitting device is provided, protruding toward the cart beyond the power transmitting device, and restricts a collision between the power transmitting device and the power receiving device.
The storage unit of claim 6.