JP2011079435A - Wheel and wheeled platform - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily repair a wheel at low cost when the surface of the wheel of a wheeled platform is damaged. <P>SOLUTION: The wheel of the wheeled platform for conveying an object to be conveyed which is loaded on the platform includes a metal hub 27 fixed to a turning shaft supported by the wheeled platform, and a resin member 29 forming a wheel surface by being attached to the hub 27. The resin member 29 is divided into several pieces and removably attached to the hub. The hub 27 has a polygon shape in cross section perpendicular to the turning shaft. The resin member 29 is formed dividedly in a circumferential direction of the wheel surface corresponding to each flat surface of the polygon shape of the hub 27. Each of the surface members is attached with a bolt 47 through a bolt hole 39 protrusively formed at the hub 27. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel and a transport carriage, and more particularly to a wheel used for an extremely low floor transport carriage for transporting heavy objects.

  Conventionally, a transport cart described in Patent Document 1 is known as a device for transporting a relatively heavy transport object (for example, several tens of tons). This transport cart is configured to support a pedestal on which a transport object is placed on the cart. The carriage includes two drive wheels and auxiliary wheels, and the two drive wheels are individually controlled for rotation by a motor. The pedestal is rotatably supported by a carriage, is placed on the lower board, a bag body provided with an air inlet / outlet port, and is placed on the bag body to carry an object to be conveyed. It is comprised with the upper plate made. The bag body is an air jack that raises and lowers the upper plate by inflating or contracting air in and out.

  As a method of transporting a transport object using such a transport cart, Patent Document 1 describes a method of transporting a single transport target in cooperation with a plurality of transport carts. Specifically, first, a plurality of transport carts are arranged between the floor surface and the transport object placed on the floor surface, and air is put into the bag body to raise the upper plate of each transport cart. Thus, the conveyance object placed on the upper plate is lifted. Then, the object to be conveyed is conveyed to the installation position by synchronously controlling the moving speed and moving direction of each conveying carriage and operating while keeping the relative position of each conveying carriage constant.

JP-A-6-206613

  By the way, in order to ensure durability against load and friction with the installation surface, the wheel surface of this type of transport carriage is formed of a resin member made of synthetic resin. However, since the transport carriage of Patent Document 1 is relatively small and mainly transports heavy objects, a large load acts on the traveling wheel. For this reason, for example, when the transport carriage rides on a step on the road surface, a dent or deformation may occur on the surface of the resin member due to an impact when the resin member collides with the step. If traveling is continued with the wheel damaged in this way, not only will the traveling performance deteriorate, but for example, a crack may spread from the damaged part and the entire wheel may be damaged. If damage is discovered, prompt action is required.

  However, the conventional wheel has a structure in which the resin member on the wheel surface is integrally formed in the circumferential direction, that is, the entire circumference, so even if only a part of the wheel surface is damaged, the entire wheel must be replaced. As a result, there is a problem that the repair cost becomes expensive.

  An object of the present invention is to provide a wheel that can be repaired easily and at low cost when the surface of a wheel of a transport carriage is damaged.

  In order to solve the above-described problems, the present invention provides a wheel of a transport carriage that loads and transports an object to be transported, a metal hub that is fixed to a rotating shaft supported by the transport carriage, and a wheel that is mounted on the hub. A surface member that forms a surface, and the surface member is divided into a plurality of parts and is detachably mounted on the hub.

  Since the surface member is divided in this way, it is possible to remove only the damaged surface member and replace it with a new surface member. This can be reduced and the economic efficiency can be increased. Moreover, since it is only necessary to replace some of the surface members, the work can be simplified as compared with the case where the entire wheel is replaced, and the working time can be shortened.

  In this case, the hub has a polygonal cross section perpendicular to the rotation axis, and the surface member is formed by dividing the wheel surface in the circumferential direction in accordance with each planar portion of the polygon of the hub. Is attached to a bolt hole drilled in the hub with a bolt. In this case, for example, when the number of surface members is six, the hub can have a regular hexagonal cross section perpendicular to the rotation axis. Further, by forming a concave portion in the flat portion of the hub and forming a convex portion that meshes with the concave portion on the surface facing the hub of the surface member, the positioning accuracy and fixing force of the surface member can be increased.

  By the way, when the surface member is formed of a relatively soft material, the surface member may be deformed so as to spread in the circumferential direction of the wheel due to the influence of the load. When the surface member is deformed in this manner, the surface members are pressed against each other at the boundary portion between the adjacent surface members, and the resin member starts to deform so that a part of the resin member rises from the surface of the wheel. When a running load acts on the part that has started to rise, there is a possibility that a crack will occur due to the concentration of stress, resulting in damage to the wheel.

  Therefore, the surface member is arranged with a gap between adjacent surface members. By thus providing a gap between the surface members from the beginning, the circumferential deformation of the wheel can be absorbed by the gap, so that the swell of the surface member can be suppressed. As a result, stress concentration during traveling can be prevented, so that the generation of cracks can be suppressed and the life of the wheel can be improved.

  Further, the surface member is formed in a T-shaped cross section instead of the above, the T-shaped head is used as a wheel surface, and the T-shaped leg is orthogonal to the circumferential direction of the hub and the circumferential direction of the hub. You may make it form as a projection part press-fitted in the several hole formed in the direction to do.

  When the surface member is formed in this way, the number of surface members to be attached to the hub is larger than that of the block-shaped surface member, but the surface member to be replaced can be limited to a more damaged part. The amount of members to be replaced can be reduced. Thereby, since the material cost of the surface member can be reduced, the replacement cost can be further reduced.

  Here, as the surface member, in order to ensure friction with the installation surface, it can be formed of synthetic resin such as nylon, but is not limited to this, for example, depending on the usage mode of the transport carriage, etc. It can also be formed of metal or the like.

  ADVANTAGE OF THE INVENTION According to this invention, repair when the surface of the wheel of a conveyance trolley is damaged can be performed simply and at low cost.

It is a figure explaining the structure of the wheel in the 1st Embodiment of this invention, (a) is a side view, (b) is AA arrow sectional drawing of (a). It is a figure which expands and shows the upper right part of Fig.1 (a). It is a front view of the conveyance trolley using the wheel of a 1st embodiment of the present invention. It is a side view of the conveyance trolley using the wheel of a 1st embodiment of the present invention. It is a side view of the wheel in the 2nd Embodiment of this invention. It is a front view of the wheel in the 2nd Embodiment of the present invention. It is the upper side figure and side view of the resin member with which the wheel in the 2nd Embodiment of this invention is mounted | worn.

(First embodiment)
Hereinafter, a first embodiment of the wheel of the present invention will be described. In this embodiment, first, in order to facilitate understanding of the present invention, an example of a transport cart provided with wheels of the present invention will be described.

  As shown in FIGS. 3 and 4, the transport carriage 1 of the present embodiment includes a traveling carriage 3 and a pedestal 5. The traveling carriage 3 has driving wheels 7 and auxiliary wheels 9, and by controlling the rotation of the driving wheels 7, each of the traveling carriage 3 can be moved straight, steered, and turned. The pedestal 5 is rotatably supported on the traveling carriage 3 and has a jack function for placing a transport object (not shown) and moving it up and down. The auxiliary wheels 9 can be replaced with auxiliary feet that slide on the running surface.

  The traveling carriage 3 includes a frame 11, two drive wheels 7, four auxiliary wheels 9, a motor (not shown) that drives each drive wheel 7, and a control device (not shown) that controls the rotation of the motor. ). The two drive wheels 7 are arranged at a substantially central position in the traveling direction of the traveling carriage 3 (FIG. 4), and are supported by the frame 11 so that the rotation axes serving as the rotation centers of the respective drive wheels 7 are coaxial with each other. ing. The drive wheels 7 are individually controlled by a separate motor.

  Two auxiliary wheels 9 are provided before and after the driving wheel 7 in the traveling direction of the traveling carriage 3 (FIG. 4), and the front and rear auxiliary wheels 9 are supported by a support member 13 hanging from the frame 11. Further, it is rotatably supported on both sides of a rotating shaft that extends in the horizontal direction. The auxiliary wheel 9 is rotatable about the support member 13 in the direction of the arrow 13a (FIG. 3).

  The motor, the transmission mechanism that transmits the rotation of the motor to the drive wheel 7, and the control device are both supported by the frame 11, and are accommodated inside the cover 15 attached to the frame 11 from the outside, for example. The control device outputs a control signal to a motor or the like based on a command input from an external controller or the like wirelessly or by wire.

  As shown in FIG. 4, the traveling carriage 3 of the present embodiment has a structure in which the bottom surface of the frame 11 is inclined upward with respect to the two drive wheels 7 toward the front and rear in the traveling direction. ing. By adopting the inclined structure in this way, when the transport carriage 1 travels on a road surface with undulations or steps, steps and the like are prevented from coming into contact with the bottom surface, and traveling performance is ensured.

  Next, the structure of the base 5 supported by the traveling cart 3 will be described. The pedestal 5 includes a lower plate 19 that is rotatably supported by the frame 11 via a bearing 17, a bag-like airbag 21 that is placed on the lower plate 19 and has an air inlet / outlet port, and an object to be conveyed is An upper plate 23 that is placed and placed on the airbag 21, and a connecting member (not shown) that connects the lower plate 19 and the upper plate 23 are provided.

  The airbag 21 is attached to the lower plate 19 and the upper plate 23 with an adhesive sheet (for example, double-sided tape), etc., and is expanded or contracted by taking air in and out to raise and lower the upper plate. Yes. A pump (not shown) for sending air to the airbag 21 is mounted on the traveling carriage 3 and its operation is controlled by a control signal from the control device.

  The end portions (at least two places) of the lower plate 19 facing each other and the end portions of the upper plate 23 facing the plurality of end portions of the lower plate 19 are connected by connecting members (not shown). Specifically, four locations near the center of each side of the lower plate 19 and the upper plate 23 are connected by connecting members. This connecting member can be configured, for example, by interposing a hydraulic cylinder between the lower plate 19 and the upper plate 23. When the airbag 21 is inflated or contracted, if the airbag 21 is broken or suddenly leaked, it becomes difficult to maintain the level of the object to be conveyed. By closing, the inclination of the upper plate 23 can be suppressed, and the upper plate 23 can be prevented from being greatly inclined and the conveyance target object sliding down. As long as the connecting member suppresses the inclination of the upper plate 23, a mechanism other than the hydraulic type can be applied.

  The transport carriage 1 configured as described above can perform straight, steering, and turning operations by separately controlling the rotation speeds of the two drive wheels 7 with a motor. That is, the two driving wheels 7 are driven at the same rotational speed during the straight traveling operation, the one driving wheel 7 is stopped or decelerated from the other driving wheel 7 during the steering operation, and the two driving wheels 7 are operated during the turning operation. The drive wheel 7 is rotated in the reverse direction.

  Next, a procedure for operating the transport carriage 1 to transport the transport object will be briefly described. First, the transport carriage 1 is moved between the floor surface and the transport object placed on the floor surface, the airbag 21 is inflated and the upper plate 23 is raised, so that the upper plate 23 is mounted. Lift the placed transport object. Next, for example, an operation command is output from the external controller to the control device of the transport carriage 1, and the rotational speed of the motor of each drive wheel 7 is controlled, so that the transport carriage 1 travels to the installation position according to a desired route. . Thereafter, when the transport carriage 1 arrives at the installation position, the airbag 21 is contracted again, the upper plate 23 is lowered, and the transport object is placed at a predetermined position.

  Since the transport carriage 1 of the present embodiment includes the auxiliary wheels 9, even a single transport object can be transported. For example, when the transport object is large, it is difficult to stably transport the single transport object. It is possible to transport a single transport object using a plurality of transport carts 1 as a set of transport devices. In this case, each transport carriage 1 does not necessarily require the auxiliary wheel 9. When such a plurality of transport carts 1 are used, an operation command is issued to each transport cart 1 from an external controller, and the relative speed of each transport cart 1 is adjusted by controlling the movement speed and direction of each transport cart. By traveling while keeping it constant, the object to be conveyed can be conveyed to the installation position according to a desired route. According to this example, it is possible to cope with an increase in the size and weight of the conveyance object. For example, it is possible to convey a conveyance object of a maximum of 100 tons with four conveyance carts 1.

  By the way, the transport cart 1 of the present embodiment has an extremely low floor where the total height from the installation surface is, for example, about 300 mm in a state where the air of the airbag 21 is completely extracted and the upper plate 23 is lowered to the lowest position. One of the selling points is a heavy-duty cart. However, since the drive wheel 7 of such a transport carriage has a small diameter of, for example, about 200 mm to 250 mm, for example, when transporting a weight of several tens of tons per transport truck, A large load is applied.

  On the other hand, the wheels of this type of transport carriage are formed of a synthetic resin resin member whose surface is softer than metal in order to ensure durability against load and friction with the installation surface. Therefore, for example, when the carriage 1 travels on a road surface with undulations or steps, when the wheels climb on the steps, the resin member collides with the steps and the surface of the resin member is dented or deformed. There is. If the wheel surface is damaged by a dent or the like in this way, stress may concentrate on that portion and the wheel may be damaged. Therefore, when the wheel surface is confirmed to be damaged, an early countermeasure is required. . However, in the conventional wheel, since the resin member is integrally formed in the circumferential direction, even if a part of the wheel surface is damaged, the wheel must be replaced, which increases the replacement cost, and the user It was a burden. In view of such problems, the present inventors have arrived at the present invention by improving the wheel structure.

  Hereinafter, the structure of the wheel which is the characteristic technique of the present embodiment will be described with reference to FIGS. The wheel does not distinguish between the drive wheel 7 and the auxiliary wheel 9, but for convenience of explanation, these will be referred to as wheels.

  The wheel according to the present embodiment includes a metal hub 27 to which the rotating shaft 25 (FIG. 3) of the wheel is fixed, and six synthetic resin (for example, nylon resin) resin members 29 attached to the hub 27. The The hub 27 has a substantially regular hexagonal cross section in the direction orthogonal to the rotation shaft 25, that is, the Y direction (FIG. 1B), and a through hole 31 through which the rotation shaft 25 is inserted is provided in the center. . The through hole 31 is provided with a key groove 33 into which a key (not shown) for preventing relative rotation between the rotary shaft 25 and the hub 27 is fitted. The hub 27 is configured to be restricted from moving in the axial direction by assembling a known retaining structure.

  The hub 27 has a circumferential surface formed of six plane portions 35, and each plane portion 35 is formed with a groove 37 having a rectangular cross section in the Y direction. A hole 39 is formed.

  The resin member 29 is divided into six parts in the circumferential direction of the wheel, and the material and shape are all the same. These resin members 29 are respectively mounted on the flat portion 35 of the hub 27, and projections 41 are provided on the surfaces facing the hub 27. That is, when the resin member 29 is attached to the hub 27, the protrusion 41 is fitted in the groove 37. Further, two stepped holes 45 penetrating these surfaces are formed between the end surface of the protrusion 41 of the resin member 29 and the opposite surface, that is, the arc-shaped surface serving as the wheel surface. ing.

  As shown in FIG. 1B, when the hub 27 and the resin member 29 are flush with each other in the X direction, the positions of the two bolt holes 39 and the two stepped holes 45 are respectively It is supposed to match. The bolt 47 inserted from the opening (the wheel surface side) of the stepped hole 45 is screwed into the bolt hole 39, so that the resin member 29 is fixed to the hub 27. When all of the six resin members 29 are fixed to the hub 27 in this way, the wheel becomes a circle with the arcuate outer peripheral surface 43 connected as shown in FIG.

  As shown in FIG. 2, the six resin members 29 fixed to the hub 27 are provided with gaps 49 having a set size between the resin members 29 adjacent to each other. Each resin member 29 is formed with a chamfer 51 at a portion where the side surface facing the gap 49 and the arcuate outer peripheral surface 43 intersect. Further, a chamfer 53 is formed over the entire circumference at a portion where both end surfaces in the X direction of the resin member 29 intersect with the arc-shaped outer peripheral surface 43 (FIG. 1B).

  Thus, in this embodiment, since the resin member 29 that forms the surface of the wheel is divided into six in the circumferential direction of the wheel and assembled to the hub 27 with bolts, for example, the six resin members 29 When the outer peripheral surface 43 of any one of the resin members 29 is damaged, only the resin member 29 can be removed and replaced with a new resin member 29. For this reason, compared with the case where it replaces | exchanges the whole wheel like the past, repair expense can be reduced significantly. Further, when replacing each wheel as in the prior art, it takes a lot of time to remove the hub 27 from the rotating shaft 25. However, according to the present embodiment, the removal work of the hub 27 is not necessary. Repair time can be greatly reduced.

  In the present embodiment, a gap 49 is provided between the adjacent resin members 29. This is because when the resin member 29 formed of a relatively soft material such as synthetic resin is deformed so as to spread in the circumferential direction of the wheel under the influence of the load, the resin member is formed at the boundary portion between the adjacent resin members 29. There is an aim to prevent the wheel surface from rising when 29 presses against each other. By providing the gap 49 between the resin members 29 as in the present embodiment, the circumferential deformation of the resin member 29 is absorbed by the gap 49, so that the resin member 29 is prevented from rising from the wheel surface. be able to. As a result, stress concentration on the swelled portion of the wheel surface can be prevented, and therefore the life of the wheel can be improved by suppressing the occurrence of cracks and the like. Here, the gap 49 is desirably set to a size calculated in view of the deformation amount of the resin member 29.

  Further, in the present embodiment, a chamfer 51 is formed at a portion where the side surface of the resin member 29 and the outer peripheral surface 43 which face each other with the gap 49 interposed therebetween, and further, a portion where both end surfaces of the resin member 29 and the outer peripheral surface 43 intersect. A chamfer 53 is formed on the surface. Thereby, since damages, such as chipping on the wheel surface, can be prevented, the life of the wheel can be improved.

  In the present embodiment, the resin member 29 is divided into six parts, but the number of divisions is not limited to this, and can be set as appropriate according to the size and specifications of the wheels. However, for example, when the number of divisions is reduced, such as four divisions, the total volume of the resin member 29 is increased, which increases costs, and when the number of divisions is increased, such as eight divisions, the number of parts And the installation work becomes complicated. For this reason, it is preferable to use 6 divisions as in this embodiment. The hub 27 can set the number of flat portions 35 in accordance with the number of divisions of the resin member 29.

  In the present embodiment, a groove 37 is formed in each hexagonal flat portion 35 of the hub 27, and a protrusion 41 that fits into the groove 37 is formed in the resin member 29. By adopting such an inlay structure, the positioning accuracy and fixing force of the resin member 29 with respect to the hub 27 can be increased. Here, the shape of the groove 37 and the protrusion 41 is not limited to the uneven shape of the present embodiment. For example, in the flat surface portion 35 of the hub 27, a protrusion having a cross-section in the Y-direction that has a divergent shape is formed, and a groove having a cross-sectional shape corresponding to the protrusion is formed in the resin member 29. It can also be set as the structure slid from a horizontal direction and engage | inserted in a groove | channel.

  In the present embodiment, the structure in which the resin member 29 is divided at equal intervals in the circumferential direction of the wheel surface has been described. However, as a structure in which the resin member 29 is divided, for example, in addition to dividing in the circumferential direction, You may make it divide | segment into the X direction orthogonal to a direction. If divided in this way, the number of parts increases, but the resin member 29 to be replaced can be limited to a more damaged part, so the amount of the member to be replaced is reduced and the amount of replacement is minimized. be able to. As a result, the material cost of the surface member can be reduced, and the replacement cost can be further reduced.

  In the present embodiment, the example in which the resin member 29 is formed of a synthetic resin of nylon has been described, but a synthetic resin other than nylon may be used as the material. Furthermore, it can be formed of a material other than synthetic resin, such as metal, depending on the road surface condition and the use of the transport carriage.

  The structure of the wheel of the present embodiment can be applied not only to the drive wheel 7 of the transport carriage 1 but also to the auxiliary wheel 9, and furthermore, if it is a transport carriage that transports the object to be transported by driving the wheel, The present invention can be applied to a transport cart having any configuration.

(Second Embodiment)
Next, a second embodiment of the wheel of the present invention will be described. In the present embodiment, the same components as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted, and configurations and features different from those of the first embodiment will be described.

  As shown in FIG. 7, the resin member 61 of the present embodiment has a T-shaped cross section, a plate-like base end portion 63 that is a T-shaped head portion, and a T-shaped leg portion. A bar-shaped protrusion 65 is provided. The base end portion 63 is formed in a regular hexagonal plane, and a protrusion 65 extends vertically from the center portion of the plane. The resin member 61 is formed of a synthetic resin such as nylon as in the first embodiment, and can be integrally formed by molding or the like.

  As shown in FIGS. 5 and 6, the hub 67 of the present embodiment has a circular cross section in the direction orthogonal to the rotation shaft 25, that is, the Y direction (FIG. 6B). A plurality of holes 61 are formed at predetermined intervals in the circumferential direction and the orthogonal direction (X direction). The diameter of the mounting hole 71 is set to a size that allows the protrusion 65 of the resin member 61 to be press-fitted.

  In the present embodiment, the resin member 61 can be attached to the hub 67 by inserting the protrusion 65 into the hole 61 of the hub 67. Here, since the base end portion 63 of the resin member 61 forms a regular hexagonal plane, the sides of the base end portion 63 are in close contact with each other in a honeycomb shape without gaps by the resin member 61 surrounding the periphery. . That is, since the resin member 61 is supported by the surrounding resin member 61, the lateral displacement is suppressed and the life can be improved.

  According to the present embodiment, when a part of the wheel surface, that is, the base end portion 63 of the resin member 61 is damaged while the transport carriage 1 is traveling, only the damaged resin member 61 is extracted and easily replaced with a new resin member. Since it can be replaced, the repair cost can be greatly reduced compared to the case where the entire wheel is replaced as in the prior art. Further, in the present embodiment, compared to the first embodiment, the resin member 61 to be replaced can be limited to a more damaged part, and the resin volume per piece can be further reduced. Repair costs can be further reduced. Further, in the present embodiment, when the resin member 61 is replaced, the projecting portion 65 of the resin member 61 can be simply removed from the mounting hole 71 and inserted, and therefore, compared with the first embodiment using bolts. Working time can be shortened.

  In the present embodiment, the example in which the base end portion 63 of the resin member 61 is formed in a regular hexagonal planar shape has been described. However, the base end portion 63 is formed in another shape, for example, a regular triangle or a square. May be. However, since the holding force of the resin member 61 is highest in the regular hexagon, the regular hexagon can be said to be the most preferable shape. In addition, the base end portion 63 is preferably formed with the same curvature as the curvature of the outer peripheral surface 69 in order to improve the adhesion with the outer peripheral surface 69 of the hub 67. By increasing the adhesion with the hub 67, the holding force of the resin member 61 can be increased, so that the life of the resin member 61 can be improved.

  As mentioned above, although embodiment of the wheel of this invention and the conveyance trolley provided with the wheel was explained in full detail using drawing, the above-mentioned embodiment is only an illustration of the present invention, and the present invention is the above-mentioned embodiment. It is not limited only to the configuration. Of course, even if there is a design change within a range not departing from the gist of the present invention, it is included in the present invention.

DESCRIPTION OF SYMBOLS 1 Conveyance trolley 3 Traveling trolley 5 Base 7 Driving wheel 9 Auxiliary wheel 25 Rotating shaft 27 Hub 29 Resin member 31 Through-hole 35 Planar part 37 Groove 39 Bolt hole 41 Projection part 49 Crevice 51,53 Chamfer 67 Hub 71 Installation hole

Claims (6)

In the wheel of the transport carriage that loads and transports the object to be transported,
A metal hub fixed to a rotating shaft supported by the transport carriage, and a surface member mounted on the hub to form a wheel surface;
The wheel according to claim 1, wherein the surface member is divided into a plurality of pieces and is detachably mounted on the hub. The hub has a polygonal cross section perpendicular to the rotation axis,
The surface member is formed by being divided in the circumferential direction of the wheel surface according to each polygonal plane portion of the hub,
The wheel according to claim 1, wherein each of the surface members is attached to a bolt hole formed in the hub with a bolt.   The wheel according to claim 2, wherein the surface member is disposed with a gap between the surface members adjacent to each other.   The surface member is formed in a T-shaped cross section, the T-shaped head is a wheel surface, and the T-shaped leg is in a direction perpendicular to the circumferential direction of the hub and the circumferential direction of the hub. The wheel according to claim 1, wherein the wheel is a protrusion that is press-fitted into the plurality of holes formed.   The wheel according to any one of claims 1 to 4, wherein the surface member is made of resin. In a transport carriage provided with a pedestal on which a transport object is placed and a traveling carriage that supports the pedestal,
The transport cart according to any one of claims 1 to 5, wherein a wheel of the traveling cart is a wheel according to any one of claims 1 to 5.

Images