Platform truck

Abstract

To provide a stackable platform track that can be placed on top of each other without removing cargo and materials from the truck bed.SOLUTION: A platform truck 1 comprises a platform truck body 2 having wheels 3 attached underneath and four poles 4 supported by the platform truck body 2. Support receiving members 10 are attached to the underside of the platform truck body 2 so that the upper ends of the poles 4 of the lower platform truck 1 are embedded therein when a plurality of platform trucks 1 are stacked vertically.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a trolley that is suitable for use when loading, transporting, storing, etc. luggage, materials, and the like.

Background Art

[0002] As a conventional trolley for loading and transporting luggage, it has a base frame and wheels attached to the bottom surface side of the base frame, and a trolley is known in which handle posts that serve as handles or partition bars can be erected at the four corners of the base frame (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above conventional trolley, since it is not assumed that the trolley is stacked vertically with luggage, materials, etc. placed on the loading platform, it is not possible to efficiently utilize the storage space or reduce the labor of unloading and loading when storing and then transporting the luggage, materials, etc. again.

[0005] Therefore, an object of the present invention is to provide a technique that enables the trolley to be stacked vertically with luggage, materials, etc. placed on the loading platform on one side.

Means for Solving the Problems

[0006] In order to solve the above problems, the trolley according to the present invention has a trolley body with wheels attached to the lower surface side, and at least four support columns held by the trolley body, and a support column receiving member into which the upper ends of the support columns of the lower trolley fit when a plurality of trolleys are stacked vertically is attached to the lower surface side of the trolley body. It may be configured in this way.

[0007] The trolley according to the present invention may be configured such that at least a part of the support columns is held rotatably with respect to the trolley body.

[0008] The trolley according to the present invention may have a corner member disposed with respect to the trolley body and rotatably supporting the support column, and the support column receiving member may be attached to the lower end of the corner member.

[0009] The trolley according to the present invention may be configured such that a support column restraint frame for connecting the support columns is attached when a plurality of trolleys are stacked vertically.

[0010] The trolley according to the present invention may be configured such that the support column restraint frame has a front-rear support column restraint frame for connecting the support columns arranged along the front-rear direction and a left-right support column restraint frame for connecting the support columns arranged along the left-right direction.

[0011] The trolley according to the present invention also has a trolley body with wheels attached to the lower surface side and at least four support columns held by the trolley body, and a support column restraint frame for connecting the support columns is attached when a plurality of trolleys are stacked vertically. It may be configured in this way.

[0012] The trolley according to the present invention may be configured such that the support column restraint frame has a front-rear support column restraint frame for connecting the support columns arranged along the front-rear direction and a left-right support column restraint frame for connecting the support columns arranged along the left-right direction.

[0013] The trolley according to the present invention may be configured such that at least a part of the support columns is held rotatably with respect to the trolley body.

[0014] The trolley according to the present invention may be configured such that a support receiving member into which the upper end of the support column of the lower trolley fits is attached to the lower surface side of the trolley body when a plurality of trolleys are stacked vertically.

[0015] The trolley according to the present invention may have a corner member disposed with respect to the trolley body and rotatably supporting the support column, and the support receiving member may be attached to the lower end of the corner member.

Advantages of the Invention

[0016] According to the present invention, on the one hand, it becomes possible to stack the trolleys vertically with the luggage, materials, etc. placed on the loading platform.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

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Figure 12

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Figure 15

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Figure 17

Figure 18

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] In the description of the present invention, as shown in each figure, along each axis of the three-dimensional orthogonal coordinate system, the vertical direction is defined, and the upward and downward directions are defined according to the directions of the respective arrows. Also, the front-rear direction is defined, and the forward and backward directions are defined according to the directions of the respective arrows. Further, the left-right direction is defined, and the rightward and leftward directions are defined according to the directions of the respective arrows. The front-rear direction and the left-right direction are orthogonal to each other in the same plane (specifically, the horizontal plane), and the vertical direction is orthogonal to the front-rear direction and the left-right direction (and thus the horizontal plane). The line of sight from the front side along the front-rear direction is a front view, and the line of sight from the rear side is a rear view. Also, the line of sight along the left-right direction is a side view, and further, the line of sight from the upper side along the vertical direction is a plan view. However, the front (front) · rear (back) and left · right are merely distinctions for explaining the present invention and do not define the orientation and direction in the usage state of the carriage according to the present invention.

[0020] In the following description, the method of attaching and joining each member is not limited to a specific method as long as it is a method capable of fixing one member to another member or fixing and joining members to each other. For example, from methods such as connection by bolts and nuts, screwing, riveting, and welding, an appropriate method is appropriately selected after considering the material of the members to be attached or joined.

[0021] (Overall Configuration) FIG. 1 is a side view showing the cart 1 according to the embodiment as an example of a specific configuration mode of the cart according to the present invention, in a state where the support column 4 is horizontally laid down. FIG. 2 is a plan view of the cart 1 according to the embodiment in a state where the support column 4 is horizontally laid down. FIGS. 3 to 5 are a side view, a rear view, and a plan view of the cart 1 according to the embodiment in a state where the support column 4 is vertically erected.

[0022] The cart 1 includes a cart body 2, wheels 3 attached to the lower surface side of the cart body 2, and support columns 4 held at the four corners of the cart body 2.

[0023] The cart body 2 has an outer shape that is generally rectangular in a plan view, and includes corner members 5 disposed at each of the four corners, a pair of left and right outer frame members 6A, a pair of front and rear outer frame members 6B, and two inner frame members 7.

[0024] The left and right outer frame members 6A are disposed in a posture where the longitudinal direction is along the front-rear direction, and connect the corner members 5 that are in a position relationship of facing each other in the front-rear direction. The left and right outer frame members 6A are disposed as a pair of members that face each other in parallel in the left-right direction.

[0025] The front and rear outer frame members 6B are disposed in a posture where the longitudinal direction is along the left-right direction, and connect the corner members 5 that are in a position relationship of facing each other in the left-right direction. The front and rear outer frame members 6B are disposed as a pair of members that face each other in parallel in the front-rear direction.

[0026] Both ends of each of the pair of left and right outer frame members 6A in the longitudinal direction (i.e., the front-rear direction), and both ends of each of the pair of front and rear outer frame members 6B in the longitudinal direction (i.e., the left-right direction) are connected by a total of four corner members 5, and a rectangular frame-shaped frame body is formed in plan view. The corner members 5 are disposed at positions corresponding to the corners (in other words, the four corners) of the cart body 2 that form a rectangle in plan view, respectively.

[0027] The inner frame member 7 is disposed in a posture where its longitudinal direction is along the front-rear direction, and connects the intermediate portions in the left-right direction of each of the pair of front and rear outer frame members 6B that face each other parallel to each other in the front-rear direction. In the example shown in the figure, between the pair of front and rear outer frame members 6B, two inner frame members 7 that face each other parallel to each other in the left-right direction are disposed. The inner frame member 7 may be disposed with only one or three or more between the pair of front and rear outer frame members 6B. Also, the inner frame member 7 is not an essential configuration in the cart according to the present invention, and the inner frame member 7 may not be disposed.

[0028] The left and right outer frame members 6A, the front and rear outer frame members 6B, and the inner frame member 7 may be constituted by, for example, members made of square tubular metal.

[0029] At each of the positions near the front end and the position near the rear end on the lower surface side of the cart body 2, a wheel support member 8 is attached in a posture where its longitudinal direction is along the left-right direction and is bridged between the pair of left and right outer frame members 6A. In the example shown in the figure, the wheel support member 8 is constituted by a member made of plate-shaped metal approximately.

[0030] A total of four wheels 3 are attached to each of the positions near the left end and the position near the right end on the lower surface side of the front and rear wheel support members 8. In the example shown in the figure, the wheels 3 are constituted by casters with brakes that can rotate horizontally and are equipped with brakes.

[0031] A top plate 9 is attached to the upper side of the cart body 2, specifically, to the upper surfaces of the left and right outer frame members 6A and the inner frame member 7. Luggage, materials, etc. are placed on the upper surface of the top plate 9.

[0032] The top plate 9 is spanned between a pair of left and right outer frame members 6A that face each other in parallel in the left - right direction, and is attached in a range corresponding to the front - rear direction between the wheel support members 8 in plan view. That is, the top plate 9 is not attached above the wheel support members 8.

[0033] For this reason, the portion of the wheel support member 8 is recessed with respect to the upper surface of the top plate 9. When the carts 1 are stacked vertically with the support columns 4 laid down horizontally, the wheels 3 of the upper cart 1 fit into the portion of the wheel support member 8 of the lower cart 1 in the stacked state (that is, the recessed portion). Thereby, it becomes difficult for the upper cart 1 to be displaced with respect to the lower cart 1, and a plurality of carts 1 can be stably stacked in the vertical direction.

[0034] The upper surfaces of the left and right outer frame members 6A and the inner frame member 7 are lower than the upper surface of the front - rear outer frame member 6B by the thickness of the top plate 9. And the upper surface of the front - rear outer frame member 6B, the upper surface of the top plate 9, and the upper edge of the corner member 5 are at the same height (in other words, in the same plane, flush).

[0035] (Corner member, support column) Figures 6 to 11 are views showing the corner member 5 disposed on the right side of the front side of the cart body 2 in the example shown in the figure.

[0036] The corner member 5 shown in Figures 6 to 11 has a column - holding portion 51 in the shape of a square tube with the axial direction along the vertical direction, a pair of left - right mounting pieces 52 that project leftward and face each other from one of the four outer side surfaces of the column - holding portion 51 (specifically, the left side surface), and a pair of front - rear mounting pieces 53 that project rearward and face each other from the outer side surface of one of these pair of left - right mounting pieces 52 (specifically, the rear side surface of the rear left - right mounting piece 52).

[0037] The column - holding portion 51 is formed in the shape of a square tube with the axial direction along the vertical direction, and has a hollow portion 511 that communicates the upper and lower opening surfaces along the vertical direction.

[0038] Note that the corner member 5 disposed on the left side of the front side of the cart body 2 is symmetric with respect to the corner member 5 disposed on the right side of the front side of the cart body 2 shown in FIGS. 6 to 11 in a form symmetric with respect to a plane (i.e., a vertical plane) along the front-rear direction and the up-down direction. Further, the corner member 5 disposed on the right side of the rear side of the cart body 2 is symmetric with respect to the corner member 5 disposed on the right side of the front side of the cart body 2 in a form symmetric with respect to a plane along the left-right direction and the up-down direction. Further, the corner member 5 disposed on the left side of the rear side of the cart body 2 is symmetric with respect to the corner member 5 disposed on the left side of the front side of the cart body 2 in a form symmetric with respect to a plane along the left-right direction and the up-down direction. And, the corner member 5 disposed on the right side of the front side of the cart body 2 and the corner member 5 disposed on the left side of the rear side of the cart body 2 have the same form, and the corner member 5 disposed on the left side of the front side of the cart body 2 and the corner member 5 disposed on the right side of the rear side of the cart body 2 have the same form.

[0039] Regarding the corner member 5 shown in FIGS. 6 to 11, an end portion in the longitudinal direction (i.e., the left-right direction) of the front-rear outer frame member 6B is sandwiched between a pair of left-right direction mounting pieces 52, and the end portion of the front-rear outer frame member 6B is fixed to the corner member 5.

[0040] Further, an end portion in the longitudinal direction (i.e., the front-rear direction) of the left-right outer frame member 6A is sandwiched between a pair of front-rear direction mounting pieces 53, and the end portion of the left-right outer frame member 6A is fixed to the corner member 5.

[0041] At each of the four corners of the cart body 2, the left-right outer frame member 6A and the front-rear outer frame member 6B are fixed to each other at right angles by the left-right direction mounting pieces 52 and the front-rear direction mounting pieces 53 of the corner member 5 disposed at each corner, thereby forming a rectangular frame body in plan view.

[0042] The pair of front-rear direction mounting pieces 53 are provided at positions that do not overlap vertically with the column holding portion 51 in plan view and at positions that do not overlap front-rear with the column holding portion 51 in front view (and rear view).

[0043] The support column 4 has a rod-shaped / columnar base end portion 41 and a rod-shaped / columnar tip end portion 42, and the base end portion 41 and the tip end portion 42 are connected in the longitudinal direction of each. The base end portion 41 and the tip end portion 42 may be constituted by, for example, a square tube-shaped metal member.

[0044] The base end portion 41 and the tip end portion 42 are connected by a pair of connecting members 43 that face each other in the left-right direction and sandwich the base end portion 41 and the tip end portion 42 and are attached across the base end portion 41 and the tip end portion 42. The connecting member 43 is attached in a manner that protrudes in the left-right direction from the right side surface or the left side surface of the base end portion 41 and the tip end portion 42.

[0045] One end of the support column 4 on the side opposite to the tip end portion 42 of the base end portion 41 (referred to as the "connection end portion") is rotatably connected to the corner member 5. Thereby, the support column 4 rotates between a horizontally laid state and a vertically erected state.

[0046] The corner members 5 are disposed at positions corresponding to the corners (in other words, the four corners) of the cart body 2 that form a quadrilateral in plan view. Therefore, the support columns 4 (specifically, the connection end portions of the base end portions 41) are connected to positions corresponding to the corners (in other words, the four corners) of the cart body 2 that form a quadrilateral in plan view.

[0047] A long hole 411 that opens in an elongated shape along the longitudinal direction of the base end portion 41 (and thus the support column 4) is formed at the connection end portion of the base end portion 41 (it may also be formed so as to penetrate the base end portion 41 in the left-right direction). The end of the long hole 411 on the side of the corner member 5 is formed at a position approximately 1 / 2 of the dimension of the base end portion 41 of the support column 4 in the front-rear direction in the vertically erected state above the edge of the base end portion 41.

[0048] At a position near the upper end of the column holding portion 51 of the corner member 5, a support shaft 54 is disposed in a posture where the axial direction is along the left - right direction (note that it may be disposed so as to penetrate the column holding portion 51 in the left - right direction). In the example shown in the figure, a bolt (and nut) is attached as the support shaft 54 to the column holding portion 51 having a square - tube shape.

[0049] The shaft portion of the support shaft 54 (in the example shown in the figure, the body portion / threaded portion of the bolt) protrudes into the hollow portion 511 of the square - tube - shaped column holding portion 51 (note that it may penetrate the column holding portion 51 in the left - right direction), and slidably fits into a long hole 411 formed at the base end portion 41 of the column 4.

[0050] By the long hole 411 at the base end portion 41 of the column 4 and the support shaft 54 of the column holding portion 51 of the corner member 5, the column 4 is connected and supported to the corner member 5 so as to be movable in the vertical direction by the dimension of the long hole 411 and rotatable along a vertical plane along the front - rear direction with the support shaft 54 as the rotation axis.

[0051] The support shaft 54 is disposed at a position approximately 1 / 2 of the dimension in the front - rear direction of the base end portion 41 of the column 4 in the vertically - erected state, downward from the upper end edge of the column holding portion 51.

[0052] As a structure for connecting the column 4 to the corner member 5 so as to be movable in the vertical direction and rotatable, a support shaft may be provided at the base end portion 41 of the column 4 and a long hole may be formed in the column holding portion 51 of the corner member 5.

[0053] At the upper end portion of the cylindrical wall on the side (specifically, the rear side in the examples shown in FIGS. 6 to 11) of the column holding portion 51 of the corner member 5 that faces the column holding portion 51 of another corner member 5 in the front - rear direction in a state where the corner member 5 is disposed at the four corners of the carriage body 2, a recess 512 is formed.

[0054] The recess 512 of the column holding portion 51 is formed in a shape and size that is substantially the same as or slightly larger than the shape and size of the cross - section orthogonal to the longitudinal direction of the base end portion 41 of the column 4.

[0055] The support column 4 is tilted towards the side where the recess 512 of the support column holding portion 51 is formed (see FIG. 9) at a position where the support shaft 54 attached to the support column holding portion 51 of the corner member 5 abuts against the lower edge of the long hole 411 after being pulled up (see FIG. 10).

[0056] At this time, in order to avoid contact with the inner wall surface of the hollow portion 511 of the support column holding portion 51 and enable the support column 4 to rotate smoothly, among the end portions of the base end portion 41 of the support column 4 on the side of the corner member 5, the upper portion in the state of being tilted horizontally is cut so as to be inclined downward toward the inner wall surface of the hollow portion 511, and an inclined portion 412 is formed.

[0057] When the support column 4 is tilted horizontally, the side of the connecting end portion of the base end portion 41 enters the recess 512 of the support column holding portion 51 of the corner member 5.

[0058] Horizontal support column receiving portions 61 are attached to the central positions in the front-rear direction of each of the pair of left and right outer frame members 6A. The horizontal support column receiving portions 61 are attached in a manner that horizontally projects outward from the left and right outer frame members 6A in the left-right direction with respect to the outside of the carriage body 2. Then, the support column 4 is maintained in a horizontal state by having its tip end portion 42 supported by the horizontal support column receiving portions 61.

[0059] In the example shown in the figure, the horizontal support column receiving portion 61 is configured by attaching a rod-shaped member bent in a U-shape in plan view so as to horizontally project outward from the carriage body 2 in the left-right direction.

[0060] When the support column 4 is tilted horizontally, it is preferable that the upper surface of the support column 4 is substantially flush (flush) with the upper surface of the top plate 9 of the carriage body 2.

[0061] When the support column 4 is erected vertically, the side of the connecting end portion of the base end portion 41 is slidably inserted into the hollow portion 511 of the support column holding portion 51 of the corner member 5 (see FIG. 11).

[0062] In any of the states where the support column 4 is horizontally laid down, vertically erected, or rotated between these horizontally laid-down and vertically erected states, the support shaft 54 slidably enters (or fits into) the long hole 411 at the base end portion 41 of the support column 4.

[0063] The support column 4 is vertically erected, and with the side of the connecting end portion of the base end portion 41 inserted into the hollow portion 511 of the support column holding portion 51 of the corner member 5, the side of the connecting end portion of the base end portion 41 is pivotally supported by the long hole 411 and the support shaft 54, and the outer surface (specifically, the four side surfaces) of the side of the connecting end portion of the base end portion 41 abuts against and is supported by the inner wall surface (specifically, the four side surfaces) of the hollow portion 511, thereby restricting rotation and maintaining the vertically erected posture.

[0064] When the support column 4 is pulled up from the vertically erected state (see FIG. 11), it moves to a state where the lower edge of the long hole 411 abuts against the support shaft 54 (see FIG. 10). In this state, there may be an inclined portion 412 formed at the connecting end portion of the base end portion 41 of the support column 4. For the support column 4 attempting to rotate with the support shaft 54 as the rotation axis, the outer surface (specifically, the outer surface in the front-rear direction) of the side of the connecting end portion of the base end portion 41 is not supported by the inner wall surface (specifically, the inner wall surface in the front-rear direction) of the hollow portion 511.

[0065] Therefore, the support column 4 is rotatable until it horizontally falls down and the side of the connecting end portion of the base end portion 41 enters the recess 512 of the support column holding portion 51 of the corner member 5 (see FIG. 9).

[0066] In the example shown in the figure, approximately 1 / 3 of the overall dimension in the longitudinal direction of the support column 4 is the base end portion 41, and approximately 2 / 3 is the tip end portion 42. However, the ratio between the base end portion 41 and the tip end portion 42 of the support column 4 is not limited to the ratio in the example shown in the figure.

[0067] In a state where two support columns 4 in a position relationship facing each other in the front-rear direction are both laid down, they are adjusted such that the tip end portion 42 of one support column 4 is on the lower side and the tip end portion 42 of the other support column 4 is on the upper side.

[0068] The tip portion 42 is formed such that the dimension in the vertical direction (in other words, the thickness) in the state where it is laid down horizontally is approximately 1 / 2 of the dimension in the vertical direction (in other words, the thickness) of the base end portion 41 in the state where it is laid down horizontally.

[0069] And, in the state where the two support columns 4 that are in a position relationship facing each other in the front-rear direction are both laid down, the tip portions 42 of each of the two support columns 4, each having a dimension in the vertical direction that is approximately 1 / 2 of the dimension in the vertical direction of the base end portion 41, overlap vertically, and the two support columns 4 both assume a horizontal posture.

[0070] With the above configuration, when the cart 1 is not in use, the support columns 4 are laid down horizontally and folded at adjacent positions on the left and right sides of the top plate 9, respectively. At this time, the tip portions 42 of each of the two support columns 4 that are in a position relationship facing each other in the front-rear direction overlap vertically, and the two support columns 4 both assume a horizontal posture.

[0071] Also, when using the cart 1, the support columns 4 are erected vertically and the side of the connecting end portion of the base end portion 41 is inserted into the hollow portion 511 of the support column holding portion 51 of the corner member 5. At this time, the upper end edge of the long hole 411 of the base end portion 41 abuts against the support shaft 54 attached to the support column holding portion 51, restricting the downward movement of the support column 4. Further, the outer surface of the side of the connecting end portion of the base end portion 41 abuts against the inner wall surface of the hollow portion 511, maintaining the state where the support column 4 is erected vertically.

[0072] Also, when finishing using the cart 1, the support column 4 is pulled up until the lower end edge of the long hole 411 of the base end portion 41 of the support column 4 abuts against the support shaft 54 attached to the support column holding portion 51 of the corner member 5, releasing the support force (in other words, the restriction of rotation) of the support column 4 by the support column holding portion 51, and the support column 4 is laid down horizontally.

[0073] (Stacking) The cart 1 according to the present invention may have a plurality of carts 1 stacked vertically.

[0074] The carriage 1 according to the embodiment has a carriage body 2 with wheels 3 attached to the lower surface side, and four support columns 4 held by the carriage body 2. On the lower surface side of the carriage body 2, a support column receiving member 10 into which the upper end of the support column 4 of the lower carriage 1 fits when a plurality of carriages 1 are stacked vertically is attached.

[0075] Specifically, in the example shown in the figure, the support column receiving member 10 is attached to the lower end of the support column holding portion 51 of the corner member 5. The support column receiving member 10 is formed in the shape of a bowl with a downward opening (in other words, an open lower end) (see FIG. 12). The support column receiving member 10 is attached with the inner surface of the bowl shape facing downward.

[0076] The support column receiving member 10 is used when the carriages 1 are stacked vertically with the support columns 4 standing vertically. Specifically, the support column receiving member 10 of the upper carriage 1 is placed on the upper end of the support column 4 of the lower carriage 1 in the vertically stacked state. For this reason, the support column receiving member 10 is provided at a position below the vertically standing support column 4 (specifically, the base end portion 41) on the lower surface side of the carriage body 2.

[0077] In the example shown in the figure, the upper fixing connection portion 102 of the support column receiving member 10 is inserted upward from the opening at the lower end of the hollow portion 511 into the hollow portion 511 of the support column holding portion 51 of the corner member 5 and then fixed and attached by bolts.

[0078] When the upper end of the support column 4 of the lower carriage 1 fits into the inner space 101 (which opens downward) at the lower part of the support column receiving member 10 attached to the upper carriage 1 in the vertically stacked state, it becomes difficult for the upper carriage 1 to be displaced relative to the lower carriage 1, and a plurality of carriages 1 can be stably stacked in the vertical direction.

[0079] When a plurality of carts 1 are stacked vertically, if the load of all the stacked carts 1 is applied to the wheels 3 of the lowermost cart 1, it is conceivable that the load-bearing capacity of the wheels 3 will be exceeded. For this reason, the dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support receiving member 10 is preferably a dimension suitable for floating the wheel 3 from the ground surface or dispersing the load applied to the wheel 3 by placing a member for placing the support receiving member 10 below the support receiving member 10.

[0080] The dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support receiving member 10 is preferably, for example, any one of a lower limit of 50 mm or more, 60 mm or more, 70 mm or more, 80 mm or more, or 90 mm or more, and an upper limit of 130 mm or less, 120 mm or less, 110 mm or less, 100 mm or less, or 90 mm or less. The dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support receiving member 10 may be, for example, 60 mm or more and 120 mm or less, 70 mm or more and 100 mm or less, or 80 mm or more and 90 mm or less.

[0081] When the dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support receiving member 10 is less than 50 mm, the support receiving member 10 is likely to come into contact with steps or obstacles on the travel path when the cart 1 travels, and the safety and convenience are reduced. Also, when the dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support receiving member 10 is greater than 130 mm, the dimension of the member for placing the support receiving member 10 below the support receiving member 10 to float the wheel 3 from the ground surface or disperse the load applied to the wheel 3 becomes large, and the convenience is reduced.

[0082] When the dimension between the lower end of the wheel 3 (in other words, the ground surface) and the lower end of the support member 10 is, for example, 80 mm or more and 90 mm or less, particularly when it is 85 mm, a rectangular prism-shaped or square prism-shaped wood or steel member with longitudinal and transverse dimensions of 90 mm × 90 mm or 100 mm × 100 mm in a cross-section orthogonal to the longitudinal direction (also referred to as "batten angle" or "sleeper") is placed below the support member 10 of the lowermost bogie 1 (in other words, interposed between the ground surface and the support member 10). By doing so, the wheel 3 can be lifted from the ground surface or the load applied to the wheel 3 can be dispersed, and it is possible to prevent the bogie 1 in a stacked state from moving unintentionally regardless of whether the wheel 3 is equipped with brakes or not.

[0083] In order to stabilize the support 4 of the lowermost bogie 1 in particular in a stacked state (in other words, to improve the support strength of the support 4; specifically, to prevent buckling of the support 4 in particular), the support restraint frame may be detachably attached to the support 4.

[0084] As the support restraint frame, for example, a front-rear support restraint frame 20 (see FIG. 13) and a left-right support restraint frame 30 (see FIG. 14) may be detachably attached to the support 4 respectively.

[0085] The front-rear support restraint frame 20 is a support restraint frame for restraining the vertically standing supports 4 facing each other in the front-rear direction.

[0086] The front-rear support restraint frame 20 has a connecting frame 21, a pair of fitting portions 22, and a connecting portion 23.

[0087] The connecting frame 21 is a rod-shaped member whose longitudinal direction is along the front-rear direction in a state where the front-rear support restraint frame 20 is attached so as to connect and restrain the supports 4 facing each other in the front-rear direction.

[0088] The pair of fitting portions 22 are joined to both ends in the longitudinal direction (i.e., the front-rear direction) of the connecting frame 21 and are provided to face each other. That is, the pair of fitting portions 22 are connected to each other by the connecting frame 21.

[0089] The fitting portion 22 is formed in a rectangular tube shape with the axial direction along the vertical direction, and has a hollow portion 221 that communicates the upper opening surface and the lower opening surface along the vertical direction.

[0090] The hollow portion 221 of the fitting portion 22 can penetrate the tip portion 42 of the support column 4. On the other hand, it is formed to have a dimension that cannot penetrate the connecting member 43 portion that protrudes more than the right side surface or the left side surface of the base end portion 41 and the tip portion 42, which is the connecting portion between the base end portion 41 and the tip portion 42 of the support column 4.

[0091] The front-rear support column restraint frame 20 enters and penetrates the tip portions 42 of the support columns 4 that face each other in the front-rear direction into the hollow portions 221 of the pair of fitting portions 22, respectively, and is fitted from the tip of the tip portion 42 to the tip portion 42.

[0092] When the fitting portion 22 moves from the tip (i.e., the upper end) of the tip portion 42 of the support column 4 toward the base end portion 41 side (i.e., downward), it is caught by the upper end of the connecting member 43 that protrudes more than the right side surface or the left side surface of the tip portion 42, and its position is fixed (see FIGS. 15 and 16).

[0093] The dimension in the longitudinal direction of the connecting frame 21 is adjusted so that the interval between the pair of fitting portions 22 becomes the interval between the tip portions 42 of the support columns 4 that face each other in the front-rear direction.

[0094] The connecting portion 23 is attached to a position on the outer wall surface of the fitting portion 22 that faces the other support column 4 in the left-right direction and is directly opposite to the support column 4 on which the fitting portion 22 is mounted, in a state where the front-rear support column restraint frame 20 is mounted so as to connect and restrain the support columns 4 that face each other in the front-rear direction.

[0095] The connecting portion 23 is formed in a cylindrical shape with its axial direction along the vertical direction, and has a hollow portion 231 that communicates the upper opening surface and the lower opening surface along the vertical direction.

[0096] The hollow portion 231 of the connecting portion 23 is formed to have a dimension that allows the connecting engagement portion 32 (described later) of the left and right support column restraint frames 30 to be inserted therethrough.

[0097] The front and rear support column restraint frames 20 are detachably mounted so as to connect and restrain the support columns 4 that face each other in the front-rear direction on the right side of the cart body 2, and are also detachably mounted so as to connect and restrain the support columns 4 that face each other in the front-rear direction on the left side of the cart body 2. The front and rear support column restraint frames 20 are mounted on the support columns 4 as a pair of members that face each other in parallel in the left-right direction.

[0098] The left and right support column restraint frames 30 are support column restraint frames for restraining the support columns 4 that stand vertically and face each other in the left-right direction.

[0099] The left and right support column restraint frames 30 are formed in a U-shape that opens downward in a front view (and a rear view) in a state where the left and right support column restraint frames 30 are mounted so as to connect and restrain the support columns 4 that face each other in the left-right direction. The left and right support column restraint frames 30 may be configured by combining or bending a plurality of rod-shaped or tubular members, or may be configured by bending a single rod-shaped or tubular member into a U-shape.

[0100] The left and right support column restraint frames 30 have a main body portion 31 and a pair of connecting engagement portions 32.

[0101] The main body portion 31 is a rod-shaped member whose longitudinal direction is along the left-right direction in a state where the left and right support column restraint frames 30 are mounted so as to connect and restrain the support columns 4 that face each other in the left-right direction.

[0102] The pair of connecting engagement portions 32 are disposed at both ends in the longitudinal direction (i.e., the left - right direction) of the main body portion 31 and are provided facing each other. That is, the pair of connecting engagement portions 32 are connected to each other by the main body portion 31. The pair of connecting engagement portions 32 are each formed in a columnar shape with their respective axial directions facing each other in parallel.

[0103] The pair of connecting engagement portions 32 of the left - right support restraint frame 30 are respectively inserted downward from the upper - end opening of the hollow portions 231 into the hollow portions 231 of a pair of connecting portions 23 that face each other in the left - right direction of each of the front - rear support restraint frames 20 that are mounted facing each other in the left - right direction.

[0104] The left - right support restraint frame 30 is detachably mounted so as to connect and restrain the support columns 4 that face each other in the left - right direction on the front side of the carriage body 2 (via the connecting portions 23 of the front - rear support restraint frame 20), and is also detachably mounted so as to connect and restrain the support columns 4 that face each other in the left - right direction on the rear side of the carriage body 2 (via the connecting portions 23 of the front - rear support restraint frame 20). The left - right support restraint frame 30 is mounted on the support columns 4 as a pair of members facing each other in parallel in the front - rear direction.

[0105] The support columns 4 that face each other in the front - rear direction on the right and left sides of the carriage body 2 are connected and restrained by the front - rear support restraint frame 20 (see FIG. 15), and further, the support columns 4 that face each other in the left - right direction on the front and rear sides of the carriage body 2 are connected and restrained by the left - right support restraint frame 30 (see FIG. 16). That is, by the front - rear support restraint frame 20 and the left - right support restraint frame 30 as support restraint frames, the support columns 4 standing vertically at the four corners of the carriage body 2 are mutually restrained in the front, rear, left, and right directions.

[0106] Then, after a column restraint frame (specifically, a front and rear column restraint frame 20 and a left and right column restraint frame 30) is attached to the column 4 of the carriage 1, another carriage 1 is stacked on the column 4 of the carriage 1 (see FIGS. 17 and 18). In this way, the column 4 of the lower carriage 1 in the vertically stacked state is stabilized (in other words, the support strength of the column 4 is improved), and a plurality of carriages 1 can be stably stacked in the vertical direction.

[0107] In FIGS. 17 and 18, two carriages 1 are vertically stacked, but three or more carriages 1 may be vertically stacked.

[0108] Also, in FIGS. 17 and 18, the goods and materials placed on the carriage 1 (specifically, mainly the top plate 9) are not shown. However, the carriage 1 may be vertically stacked with the goods and materials mainly placed on the top plate 9, and the goods and materials may be placed on the carriage 1 (specifically, mainly the top plate 9) in the vertically stacked state. The carriage 1 with the goods and materials mainly placed on the top plate 9 may be stacked on another carriage 1 with the goods and materials mainly placed on the top plate 9, for example, by using a forklift.

[0109] Also, in FIGS. 17 and 18, a column restraint frame (specifically, a front and rear column restraint frame 20 and a left and right column restraint frame 30) is also attached to the column 4 of the upper (in other words, the topmost) carriage 1 in the vertically stacked state. However, the column restraint frame may not be attached to the column 4 of the topmost carriage 1 in the vertically stacked state.

[0110] Note that the front and rear strut restraint frames 20 and the left and right strut restraint frames 30 as the strut restraint frames are mounted on the intermediate portion in the longitudinal direction (i.e., the vertical direction) of the strut 4 by the fitting portion 22 of the front and rear strut restraint frames 20 being hooked on the upper end of the connecting member 43 of the strut 4 and the position being fixed. The strut restraint frame is preferably mounted in a range excluding a range of 1 / 6 of the longitudinal dimension of the entire strut 4 from both ends (i.e., the upper end and the lower end) in the longitudinal direction (i.e., the vertical direction) of the strut 4 (i.e., a range of 4 / 6 of the longitudinal dimension of the entire strut 4 centered on the central portion in the longitudinal direction of the strut 4), and more preferably in a range excluding a range of 1 / 5 of the longitudinal dimension of the entire strut 4 (i.e., a range of 3 / 5 of the longitudinal dimension of the entire strut 4 centered on the central portion in the longitudinal direction of the strut 4). By mounting the strut restraint frame in a predetermined range including the central portion in the longitudinal direction of the strut 4, buckling of the strut 4 is effectively prevented particularly when other carts 1 are stacked vertically on the upper end of the strut 4.

[0111] (Function and Effect) According to the cart 1 according to the embodiment, since the strut receiving member 10 into which the upper end of the strut 4 of the lower cart 1 fits when a plurality of carts 1 are stacked vertically is attached to the lower surface side of the cart body 2, it is possible to stack the carts 1 vertically with loads and materials etc. placed on the cart 1 (specifically, mainly on the top plate 9). As a result, it is possible to efficiently utilize the storage space, and it is also possible to reduce the labor of unloading and loading when storing and then transporting loads and materials etc. once again.

[0112] According to the cart 1 according to the embodiment, further, when a plurality of carts 1 are stacked vertically, since the strut restraint frames (specifically, the front and rear strut restraint frames 20 and the left and right strut restraint frames 30) for connecting the struts 4 are attached, it is possible to stabilize the struts 4 of the lower cart 1 in the vertically stacked state (in other words, improve the support strength of the struts 4), and it is possible to stack a plurality of carts 1 stably in the vertical direction.

[0113] As described above, the embodiments of the present invention have been explained. However, the specific configuration of the present invention is not limited to the above embodiments, and forms in which modifications and changes are made to the above embodiments without departing from the gist of the present invention are also included in the present invention.

[0114] For example, in the above embodiment, the support column 4 is rotatably connected to the corner member 5. However, the support column 4 may be configured as a member independent of the corner member 5 (and thus the cart body 2) without being connected to the corner member 5. In this case, when using the cart 1, the support columns may be inserted vertically into the respective hollow portions 511 of the support column holding portions 51 of each corner member 5.

[0115] In addition, when the support columns 4 are rotatably connected to each of the corner members 5 at the four corners of the cart body 2 as in the above embodiment, the cart 1 can be assembled and stored only by vertically standing or horizontally laying down the support columns 4, and the labor for assembling and storing the cart 1 can be reduced. Although the support column 4 may be constituted by a square tubular member as in the above embodiment, it is not limited to a square tubular member and may be constituted by a cylindrical member. Specifically, the support column may be constituted by, for example, a single pipe.

[0116] Also, in the above embodiment, the four support columns 4 held at the four corners of the cart body 2 are connected by support column restraint frames (specifically, the front and rear support column restraint frames 20 and the left and right support column restraint frames 30) to be mutually restrained. However, the number of support columns is not limited to four, and five or more support columns may be held on the cart body 2.

[0117] Specifically, for example, struts may be further disposed between struts that are disposed at the four corners of the carriage body 2 and face each other in the front-rear direction (specifically, at the position where the horizontal strut receiving portion 61 is attached in the above-described embodiment), and the front-rear strut restraint frame 20 in the above-described embodiment may connect the three struts to restrain each other.

[0118] The strut restraint frame may have, that is, a front-rear strut restraint frame that is detachably attached to a plurality of struts arranged along the front-rear direction and connects these plurality of struts arranged along the front-rear direction, and a left-right strut restraint frame that is detachably attached to a plurality of struts arranged along the left-right direction and connects these plurality of struts arranged along the left-right direction. When five or more struts are held by the carriage body 2, a strut receiving member 10 is provided at a position below the strut 4 (specifically, the base end portion 41) that is vertically erected on the lower surface side of the carriage body 2 corresponding to each strut.

[0119] In particular, when five or more struts are held by the carriage body 2, some struts may be rotatably connected to the carriage body 2 (specifically, for example, the corner member 5), and the other struts may be configured as members independent of the carriage body 2 without being connected to the carriage body 2.

[0120] That is, for the carriage according to the present invention, at least four struts may be held by the carriage body, and a strut receiving member 10 corresponding to each of these at least four struts may be provided. For the carriage according to the present invention, also, at least four struts may be held by the carriage body, and the strut restraint frame may be configured to connect the intermediate portions in the vertical direction of these at least four struts. For the carriage according to the present invention, also, at least four struts may be held by the carriage body, the front-rear strut restraint frame may be configured to connect the intermediate portions in the vertical direction of at least two struts arranged along the front-rear direction, and the left-right strut restraint frame may be configured to connect the intermediate portions in the vertical direction of at least two struts arranged along the left-right direction.

[0121] In the above-described embodiment, a pair of front and rear strut restraint frames 20 and a pair of left and right strut restraint frames 30, which are each an independent member, are combined (in other words, connected to each other) to form a strut restraint frame. However, components, members, and parts corresponding to the pair of front and rear strut restraint frames 20 in the above-described embodiment and components, members, and parts corresponding to the pair of left and right strut restraint frames 30 may be joined in advance so that the strut restraint frame has an integral structure (in other words, a member). In this case, the strut restraint frame is configured, for example, as an integral frame body having a quadrangular shape in plan view.

Explanation of Signs

[0122] 1 bogie 2 bogie body 3 wheel 4 strut 41 base end portion 411 long hole 412 inclined portion 42 tip end portion 43 connecting member 5 corner member 51 strut holding portion 511 hollow portion 512 concave portion 52 left - right direction mounting piece 53 front - rear direction mounting piece 54 support shaft 6A left - right outer frame member 6B front - rear outer frame member 61 horizontal strut receiving portion 7 inner frame member 8 wheel support member 9 top plate 10 strut receiving member 101 inner space 102 fixed connection portion 20 front - rear strut restraint frame 21 connecting frame 22 fitting portion 221 hollow portion 23 connection portion 231 hollow portion 30 left - right strut restraint frame 31 main body portion 32 connection and engagement part

Claims

1. A cart body with wheels attached to the lower side, and at least four support columns held by the cart body. On the lower surface side of the cart body, a support column receiving member is attached into which the upper ends of the support columns of the lower cart fit when a plurality of carts are stacked vertically. A cart characterized by the above.

2. At least a part of the support columns is held rotatably with respect to the cart body. The cart according to claim 1, characterized by the above.

3. It has a corner member disposed with respect to the cart body and rotatably supporting the support columns, and the support column receiving member is attached to the lower end of the corner member. The cart according to claim 1, characterized by the above.

4. When a plurality of carts are stacked vertically, a support column restraint frame for connecting the support columns is attached. The cart according to claim 1, characterized by the above.

5. The support column restraint frame has a front - rear support column restraint frame for connecting the support columns arranged along the front - rear direction, and a left - right support column restraint frame for connecting the support columns arranged along the left - right direction. The cart according to claim 4, characterized by the above.

6. A cart body with wheels attached to the lower side, and at least four support columns held by the cart body. When a plurality of carts are stacked vertically, a support column restraint frame for connecting the support columns is attached. A cart characterized by the above.

7. The support column restraint frame has a front - rear support column restraint frame for connecting the support columns arranged along the front - rear direction, and a left - right support column restraint frame for connecting the support columns arranged along the left - right direction. The cart according to claim 6, characterized by the above.

8. At least a part of the support columns is held rotatably with respect to the cart body. The cart according to claim 6, characterized by the above.

9. On the lower surface side of the cart body, a support column receiving member is attached into which the upper ends of the support columns of the lower cart fit when a plurality of carts are stacked vertically. The cart according to claim 6, characterized by the above.

10. It has a corner member disposed with respect to the cart body and rotatably supporting the support columns, and the support column receiving member is attached to the lower end of the corner member. The cart according to claim 9, characterized by the above.

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