Dolly

Abstract

To adjust a dimension of a loading portion of a dolly according to a cargo's size.SOLUTION: A dolly 1A comprises a first loading portion 3, a second loading portion 4 whose distance from the first loading portion 3 changes, and a third loading portion 5 whose distance from the first loading portion 3 changes. The first loading portion 3 is positioned between the second loading portion 4 and the third loading portion 5, and the first loading portion 3 is equipped with two wheels.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a collapsible transport trolley.

Background Art

[0002] As a conventional trolley for placing and transporting long and heavy members, there is known a work trolley having a pair of horizontal frames and a pair of vertical frames to which casters for two are attached, and the pair of vertical frames and the pair of horizontal frames are detachably assembled into a rectangular shape (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] By the way, the size of the load placed on and transported by the trolley (specifically, the dimensions in the longitudinal and lateral directions in plan view) varies from short to long, and it is preferable that the loading part of the trolley has a size adapted to the size of the load. That is, when a short load is placed on the trolley and transported, if the loading part is excessively large with respect to the load, a lot of waste will occur in securing the passage space of the trolley and the labor of pushing it by hand. On the other hand, when a long load is placed on the trolley and transported, if the loading part is excessively small with respect to the load, the load cannot be placed stably, and eventually the load may fall, resulting in a decrease in safety, etc.

[0005] For this reason, it is conceivable to prepare in advance a large number of trolleys with mutually different sizes of the loading part so that the size of the loading part can be selected according to the various sizes of the load. However, in this case, there is a problem that waste occurs, such as there are trolleys that are not used in addition to the trolleys used according to the size of the load.

[0006] Therefore, in one aspect, an object of the present invention is to provide a technology capable of adjusting the dimensions of the loading part of a trolley according to the size of the load.

Means for Solving the Problems

[0007] To solve the above problems, a trolley according to the present invention includes a first loading part, a second loading part whose distance from the first loading part changes, and a third loading part whose distance from the first loading part changes. The first loading part is located between the second loading part and the third loading part, and the first loading part may be provided with at least one wheel.

[0008] In the trolley according to the present invention, the second loading part and the third loading part include a connecting frame, the first loading part includes a hollow cylindrical member into which the connecting frame is inserted or pulled out, and the axial direction of the connecting frame and the axial direction of the hollow cylindrical member are along the direction in which the distance changes.

[0009] The trolley according to the present invention may have a telescopic fixing mechanism for fixing the distance between the first loading part and the second loading part, and a telescopic fixing mechanism for fixing the distance between the first loading part and the third loading part.

[0010] The trolley according to the present invention may be such that the first loading part, the second loading part, and the third loading part include a pipe insertion part into which a rod-shaped member is detachably inserted.

[0011] The trolley according to the present invention may be such that the first loading part includes a member that contacts a part of the lower trolley in a state where the trolleys are stacked in the vertical direction.

[0012] The trolley according to the present invention may be such that the first loading part includes a member that contacts the upper end of the rod-shaped member inserted into the pipe insertion part of the first loading part of the lower trolley in a state where the trolleys are stacked in the vertical direction.

Advantages of the Invention

[0013] According to the present invention, on one hand, it is possible to adjust the dimensions of the loading part of the trolley according to the size of the load.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0016] In the description of the present invention, as shown in each figure, the vertical direction is defined along each axis of the three-dimensional orthogonal coordinate system, 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. Furthermore, 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 within 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, the line of sight along the left-right direction is a side view, and the line of sight from the upper side along the vertical direction is a plan view. However, the front (front), rear, left, and right are merely distinctions for explaining the present invention and do not define the orientation or direction in the usage state of the trolley according to the present invention.

[0017] 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 for attachment or fixing members to each other for joining. For example, among 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.

[0018] (Embodiment 1) Figures 1 to 6 are diagrams showing the structure of the trolley 1A according to Embodiment 1 as an example of a specific configuration mode of the trolley according to the present invention. Figures 1 to 3 are diagrams showing the state in which the trolley 1A is most extended (also referred to as the "extended state"), and Figures 4 to 6 are diagrams showing the state in which the trolley 1A is most shortened (also referred to as the "shortened state").

[0019] The trolley 1A according to Embodiment 1 has a first loading part 3, a second loading part 4 whose distance from the first loading part 3 changes, and a third loading part 5 whose distance from the first loading part 3 changes. The first loading part 3 is located between the second loading part 4 and the third loading part 5, and the first loading part 3 is provided with two wheels.

[0020] The carriage 1A has a loading part 2, and the loading part 2 is composed of a first loading part 3, a second loading part 4, and a third loading part 5.

[0021] Since the loading part 2 of the carriage 1A is composed of the above three elements, the dimension of the loading part 2 in the front-rear direction is adjustable. In other words, the loading part 2 is telescopic.

[0022] (First Loading Part) The first loading part 3 of the loading part 2 includes a frame member constituting the skeleton, a stacking receiving part, a pipe insertion part 37, and a central support wheel 6.

[0023] As the frame members constituting the skeleton of the first loading part 3, a pair of left and right frames 31 that are arranged along the front-rear direction while being spaced apart from each other in plan view and facing each other in parallel, and a pair of front and rear frames 32 that are arranged along the left-right direction while being spaced apart from each other in plan view and facing each other in parallel and connecting the positions near the ends in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 31 (i.e., the positions near the front end and the positions near the rear end).

[0024] Both of the pair of left and right frames 31 are constituted by hollow cylindrical members.

[0025] The pair of front and rear frames 32 are arranged and attached in a posture where the axial direction is along the left-right direction on the upper surfaces of the positions near the ends in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 31 (i.e., the position near the front end and the position near the rear end).

[0026] A frame body that is generally rectangular in plan view is formed by the pair of left and right frames 31 and the pair of front and rear frames 32.

[0027] The first load portion 3 may be formed in a generally rectangular shape that is long in the front-rear direction, where, as in the example shown in the figure, a pair of left and right frames 31 correspond to the long sides and a pair of front and rear frames 32 correspond to the short sides in a plan view, or may be formed in a generally rectangular shape that is long in the left-right direction in a plan view, or further may be formed in a generally square shape in a plan view.

[0028] Inside the generally rectangular frame body of the first load portion 3, the short-side reinforcing frame 33 is bridged and attached between the left and right side surfaces of each of the pair of left and right frames 31. Specifically, the short-side reinforcing frame 33 is bridged between the central portions in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 31 and is disposed and attached in a posture where the axial direction is along the left-right direction.

[0029] The stacking receiving portion has a stacking receiving column 34, a reinforcing column 35, and a stacking receiving member 36.

[0030] The stacking receiving column 34 is disposed and attached below each of the pair of front and rear frames 32 in a posture where the axial direction of the column is along the up-down direction.

[0031] Specifically, the stacking receiving column 34 is attached below each of the both ends in the axial direction (i.e., the left-right direction) of the front and rear frame 32 with the left and right frames 31 interposed therebetween (specifically, on the lower surface of the left and right frames 31).

[0032] The reinforcing column 35 is disposed and attached between the stacking receiving columns 34 provided below each of the both ends in the axial direction (i.e., the left-right direction) of each of the pair of front and rear frames 32, that is, on the lower surface of the intermediate portion in the axial direction of the front and rear frames 32, in a posture where the axial direction of the column is along the up-down direction. Two reinforcing columns 35 are attached to each of the pair of front and rear frames 32.

[0033] For each of the pair of front and rear frames 32, a total of four reinforcing struts 35, two for each, are spanned between the front and rear side surfaces of each of them and the front and rear side surfaces of the short-side reinforcing frame 33 (that is, a total of four). The longitudinal reinforcing frame 38 is arranged and attached in a posture where the axial direction is along the front-rear direction.

[0034] The number of each of the short-side reinforcing frame 33, the reinforcing struts 35, and the longitudinal reinforcing frame 38 is not limited to the number in the example shown in the figure, and may be appropriately set to an appropriate number in consideration of ensuring an appropriate degree of reinforcement. Also, the short-side reinforcing frame 33, the reinforcing struts 35, and the longitudinal reinforcing frame 38 are not essential components in the present invention and may not be provided.

[0035] The stacking receiving member 36 is arranged and attached to the lower ends of the stacking receiving struts 34 and the reinforcing struts 35 in a posture where the longitudinal direction is along the left-right direction. The stacking receiving member 36 is formed and attached as a member that constitutes a recess (in other words, a groove, or a pair of front and rear convex portions) that is open at the lower end surface (in other words, downward opening) and continuous along the left-right direction.

[0036] In the example shown in the figure, the stacking receiving member 36 is provided as a single continuous member without interruption between the pair of stacking receiving struts 34, but it may also be constituted and provided by a plurality of members that are divided at least at one or more places.

[0037] The pipe insertion portion 37 is formed in a relatively short hollow cylindrical shape and is arranged and attached to the upper surface side of the central portion in the axial direction (that is, the front-rear direction) of each of the pair of left and right frames 31 in a posture where the axial direction is along the up-down direction. The pipe insertion portion 37 has an open upper end surface in a state of being attached to the left and right frames 31, and at least a part of the opening of the lower end surface is blocked by the left and right frames 31.

[0038] The pipe insertion part 37 is thus attached to the upper surface side of the connection part between each of the pair of left and right frames 31 and the short-side reinforcing frame 33 spanned between the pair of left and right frames 31, and to the upper surface side of each of both ends in the axial direction (i.e., the left-right direction) of the short-side reinforcing frame 33.

[0039] In the example shown in the figure, that is, two pipe insertion parts 37 are provided as a pair spaced apart from each other in the left-right direction, but the number of pipe insertion parts provided in the first loading part 3 is not limited to two, and may be one, or may be three or more.

[0040] A rod-shaped member 10 such as a single pipe with a length dimension of about 100 to 150 cm is detachably inserted into the pipe insertion part 37 in a posture where the axial direction is along the vertical direction (see FIGS. 3 and 6). For this reason, the dimension of the pipe insertion part 37 along the axial direction is adjusted to a dimension that can stably hold a rod-shaped member 10 such as a single pipe in a state where it is inserted into the pipe insertion part 37.

[0041] The rod-shaped member 10 such as a single pipe inserted into the pipe insertion part 37 functions as a vertical post to prevent the load placed on the loading part 2 from falling off the loading part 2, and is also used as a support for the operator to grasp and push or pull when moving the cart 1A.

[0042] The central support wheel 6 is attached to the lower surface side of the central part in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 31.

[0043] The central support wheel 6 is thus attached to the lower surface side of each of the positions near both ends in the axial direction (i.e., the left-right direction) of the short-side reinforcing frame 33 spanned between the pair of left and right frames 31.

[0044] The central support wheels 6 are also attached at positions inside the loading part 2 in the left-right direction (in other words, positions away from the ends of the short-side reinforcing frame 33), rather than at the upper surface sides of both ends in the axial direction (i.e., the left-right direction) of the short-side reinforcing frame 33. Therefore, the distance between the central support wheels 6 in the left-right direction is smaller than the distance between the pipe insertion parts 37 in the left-right direction.

[0045] In the example shown in the figure, that is, the central support wheels 6 are provided as a pair spaced apart from each other in the left-right direction. However, the number of wheels provided in the first loading part 3 is not limited to two, and may be one or three or more. That is, the first loading part 3 only needs to be provided with at least one wheel.

[0046] When only one wheel is provided in the first loading part 3, the wheel is preferably attached to the center of gravity position in the plan view of the first loading part 3. Specifically, for example, when only one wheel is attached to the first loading part 3 in the example shown in the figure, it is preferable that one wheel is attached to the lower surface side at the center position in the axial direction (i.e., the left-right direction) of the short-side reinforcing frame 33.

[0047] The central support wheels 6 may be wheels that cannot horizontally rotate and are direction-fixed, but are preferably casters that can horizontally rotate and are freely directional.

[0048] (Second loading part) The second loading part 4 of the loading part 2 is configured such that the distance (in other words, the dimension) in the front-rear direction between the second loading part 4 and the first loading part 3 changes between the position farthest from the first loading part 3 (i.e., the extended state; see FIGS. 1 to 3) and the position closest to (in other words, adjacent to) the first loading part 3 (i.e., the shortened state; see FIGS. 4 to 6) in front of the first loading part 3.

[0049] The second loading part 4 includes a frame member constituting the skeleton, a pipe insertion part 44, a connecting frame 45, and a front wheel 7.

[0050] The second load portion 4 includes, as frame members constituting the skeleton of the second load portion 4, a pair of left and right frames 41 that are arranged along the front-rear direction while being spaced apart from each other in plan view and face each other in parallel, a front-end frame 42 that connects the front ends of the pair of left and right frames 41 in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 41 in plan view along the left-right direction via pipe insertion portions 44, and an auxiliary frame 43 that connects the rear-end portions of the pair of left and right frames 41 in the axial direction (i.e., the front-rear direction) of each of the pair of left and right frames 41 in plan view along the left-right direction.

[0051] The dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 41 may be set to be shorter than the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first load portion 3, or may be set to be shorter than half of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first load portion 3, or may be set to be shorter than one-fourth of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first load portion 3, or may be set to be shorter than one-sixth of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first load portion 3.

[0052] Both of the pair of left and right frames 41 are each constituted by a hollow cylindrical member.

[0053] Connecting frames 45 are inserted into and joined to the hollow portions of the pair of left and right frames 41 respectively.

[0054] The connecting frames 45 are provided as a pair of members that are arranged along the front-rear direction while being spaced apart from each other in plan view and face each other in parallel.

[0055] Each of the pair of connecting frames 45 is inserted slidably into the hollow portions of the pair of left and right frames 31 of the first load portion 3 from the rear-end side.

[0056] A stopper mechanism may be provided between the connecting frame 45 and the left and right frames 31 so that the connecting frame 45 does not completely come out of the left and right frames 31 of the first loading part 3.

[0057] For example, as shown in the figure, stopper holes 311 are formed at positions near the tips of the left and right side surfaces of the left and right frames 31 of the first loading part 3, and the connecting frame 45 is constituted by a hollow cylindrical member, and a V-lock pin (not shown) with a dowel part protruding outward in the left-right direction is disposed inside the tip part of the cylindrical member. In the example shown in the figure, when in the extended state, the dowel part of the V-pin disposed on the connecting frame 45 fits into the stopper holes 311 formed in the left and right frames 31, thereby functioning as a stopper and preventing the connecting frame 45 from completely coming out of the left and right frames 31.

[0058] The dimension of the connecting frame 45 in the longitudinal direction (i.e., the front-rear direction) may be set to about half of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction), or may be set to be longer than half of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction), and further may be set to be shorter than half of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction).

[0059] By setting the dimension of the connecting frame 45 in the longitudinal direction to about half of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction, the carriage 1A in the shortened state becomes compact, and the width of the change in the distance in the front-rear direction between the second loading part 4 and the first loading part 3 becomes maximum.

[0060] The pipe insertion part 44 is formed in a relatively short hollow cylindrical shape, and is disposed and attached to the front end surfaces of the pair of left and right frames 41 in the axial direction (i.e., the front-rear direction) in a posture where the axial direction is along the vertical direction. The pipe insertion part 44 has an open upper end surface in a state of being attached to the left and right frames 41.

[0061] The pipe insertion part 44 is provided as a pair that are spaced apart from each other in the left - right direction.

[0062] The pipe insertion part 44 is provided such that its upper end surface is positioned above the upper surface of the left - right frame 41, and its lower end surface is flush with the lower surface of the left - right frame 41 or positioned above the lower surface of the left - right frame 41.

[0063] A rod - shaped member 10 such as a single - pipe with a length dimension of about 100 - 150 cm is detachably inserted into the pipe insertion part 44 in a posture where the axial direction is along the vertical direction (see FIGS. 3 and 6). For this reason, the dimension of the pipe insertion part 44 along the axial direction is adjusted to a dimension that can stably hold a rod - shaped member 10 such as a single - pipe inserted into the pipe insertion part 44.

[0064] A support member 49 for supporting the lower end of a rod - shaped member 10 such as a single - pipe inserted into the pipe insertion part 44 is attached to the lower - end side of the pipe insertion part 44. The support member 49 attached to the lower - end side of the pipe insertion part 44 may be, for example, a plate - shaped member that closes at least a part of the opening of the lower - end surface of the pipe insertion part 44.

[0065] The rod - shaped member 10 such as a single - pipe inserted into the pipe insertion part 44 functions as a vertical post to prevent the load placed on the loading part 2 from falling off the loading part 2, and is also used as a support post for the operator to grasp and push or pull when moving the cart 1A.

[0066] The front - end frame 42 is bridged between the left - right side surfaces of each of the pair of pipe insertion parts 44 and is disposed and attached in a posture where the axial direction is along the left - right direction.

[0067] The pipe insertion part 44 is provided such that its upper end surface is positioned above the upper surface of the left and right frames 41 as described above. The upper surfaces of the front end frames 42 attached to the left and right side surfaces of such a pipe insertion part 44 and the upper surfaces of the front and rear frames 32 of the first loading part 3 are adjusted to be horizontally aligned with each other (i.e., at the same height).

[0068] The auxiliary frame 43 is bridged and attached between the left and right side surfaces of each of the pair of left and right frames 41. Specifically, the auxiliary frame 43 is bridged between the left and right side surfaces of the rear end portions of each of the pair of left and right frames 41 and is disposed and attached in a posture where the axial direction is along the left - right direction.

[0069] The reinforcing member 46 is attached so as to be interposed between the front end frame 42 and the auxiliary frame 43. Specifically, the upper surface of the front end portion of the reinforcing member 46 is joined to the lower surface of the front end frame 42 and the rear end is joined to the front surface of the auxiliary frame 43, and it is disposed and attached in a posture where the axial direction is along the front - rear direction.

[0070] In the example shown in the figure, two reinforcing members 46 are provided. However, the number of reinforcing members 46 is not limited to two, and may be appropriately set to an appropriate number in consideration of, for example, an appropriate degree of reinforcement. Also, the reinforcing member 46 is not an essential configuration in the present invention and may not be provided.

[0071] The front wheels 7 are attached to the lower surface sides of the positions near the front ends of each of the pair of left and right frames 41 respectively.

[0072] The front wheels 7 may be wheels that cannot horizontally rotate and have a fixed direction, but are preferably casters that can horizontally rotate and have a freely adjustable direction.

[0073] With the above configuration, the second loading part 4 uses a pair of connecting frames 45 as guide members. As the front wheels 7 rotate along the front-back direction, the front-end frame 42 and the front-back frame 32 remain parallel to each other, and the distance (or dimension) in the front-back direction between the second loading part 4 and the first loading part 3 can change, that is, it can approach or move away from the first loading part 3.

[0074] (The third loading part) Among the loading parts 2, the third loading part 5 is located behind the first loading part 3. The distance (or dimension) in the front-back direction between the third loading part 5 and the first loading part 3 can change between the position farthest from the first loading part 3 (i.e., the extended state; see FIGS. 1 to 3) and the position closest to (or adjacent to) the first loading part 3 (i.e., the contracted state; see FIGS. 4 to 6).

[0075] The third loading part 5 is arranged so as to sandwich the first loading part 3 between the second loading part 4 in the front-back direction. In other words, the first loading part 3 is sandwiched between the second loading part 4 and the third loading part 5 in the front-back direction.

[0076] The third loading part 5 includes a frame member forming the skeleton, a pipe insertion part 54, a connecting frame 55, and a rear wheel 8.

[0077] As the frame members forming the skeleton of the third loading part 5, a pair of left and right frames 51 that are arranged along the front-back direction while being spaced apart from each other in a plan view and facing each other in parallel, a rear-end frame 52 that connects the rear ends in the axial direction (i.e., the front-back direction) of each of the pair of left and right frames 51 in the left-right direction via the pipe insertion part 54, and an auxiliary frame 53 that connects the front-end portions in the axial direction (i.e., the front-back direction) of each of the pair of left and right frames 51 in the left-right direction are included.

[0078] The dimension of the left and right frames 51 in the longitudinal direction (i.e., the front-rear direction) may be set to be shorter than the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction), or may be set to be shorter than half of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction), further, may be set to be shorter than one-fourth of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction), or may be set to be shorter than one-sixth of the dimension of the left and right frames 31 of the first loading part 3 in the longitudinal direction (i.e., the front-rear direction).

[0079] The dimension of the left and right frames 51 of the third loading part 5 in the longitudinal direction (i.e., the front-rear direction) may be the same as or different from the dimension of the left and right frames 41 of the second loading part 4 in the longitudinal direction (i.e., the front-rear direction).

[0080] Both of the pair of left and right frames 51 are constituted by hollow cylindrical members.

[0081] Connecting frames 55 are inserted into and joined to the hollow portions of each of the pair of left and right frames 51.

[0082] The connecting frames 55 are provided as a pair of members that are arranged along the front-rear direction while being spaced apart from each other in a plan view and face each other in parallel.

[0083] Each of the pair of connecting frames 55 is inserted slidably into the hollow portions of each of the pair of left and right frames 31 of the first loading part 3 from the front end side.

[0084] A stopper mechanism may be provided between the connecting frames 55 and the left and right frames 31 so that the connecting frames 55 do not completely come out of the left and right frames 31 of the first loading part 3.

[0085] For example, as shown in the figure, stopper holes 312 are formed at positions near the rear ends of the left and right side surfaces of the left and right frames 31 of the first loading part 3, and a connecting frame 55 is formed by a hollow cylindrical member, and a V-lock pin (not shown) with a dowel part protruding outward in the left-right direction is disposed inside the tip part of the cylindrical member. In the example shown in the figure, when in the extended state, the dowel part of the V-pin disposed on the connecting frame 55 fits into the stopper holes 312 formed in the left and right frames 31, thereby functioning as a stopper and preventing the connecting frame 55 from completely coming off the left and right frames 31.

[0086] The dimension in the longitudinal direction (i.e., the front-rear direction) of the connecting frame 55 may be set to about half of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first loading part 3, or may be set to be longer than half of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first loading part 3, and further, may be set to be shorter than half of the dimension in the longitudinal direction (i.e., the front-rear direction) of the left and right frames 31 of the first loading part 3.

[0087] When the dimension in the longitudinal direction of the connecting frame 55 is set to about half of the dimension in the longitudinal direction of the left and right frames 31 of the first loading part 3, the carriage 1A in the contracted state becomes compact, and the width of the change in the distance in the front-rear direction between the third loading part 5 and the first loading part 3 becomes maximum.

[0088] The pipe insertion part 54 is formed in a relatively short hollow cylindrical shape, and is disposed and attached to the rear end surfaces of the pair of left and right frames 51 in the axial direction (i.e., the front-rear direction) in a posture where the axial direction is along the vertical direction. The pipe insertion part 54 has an open upper end surface in a state of being attached to the left and right frames 51.

[0089] The pipe insertion part 54 is provided as a pair that are spaced apart from each other in the left-right direction.

[0090] The pipe insertion part 54 is provided such that its upper end face is located above the upper surface of the left and right frames 51, and its lower end face is flush with the lower surface of the left and right frames 51 or located above the lower surface of the left and right frames 41.

[0091] A rod-shaped member 10 such as a single pipe with a length dimension of about 100 to 150 cm is detachably inserted into the pipe insertion part 54 in a posture where the axial direction is along the vertical direction (see FIGS. 3 and 6). For this reason, the dimension of the pipe insertion part 54 along the axial direction is adjusted to a dimension that can stably hold a rod-shaped member 10 such as a single pipe in a state where it is inserted into the pipe insertion part 54.

[0092] A support member 59 for supporting the lower end of a rod-shaped member 10 such as a single pipe inserted into the pipe insertion part 54 is attached to the lower end side of the pipe insertion part 54. The support member 59 attached to the lower end side of the pipe insertion part 54 may be, for example, a plate-shaped member that closes at least a part of the opening of the lower end face of the pipe insertion part 54.

[0093] The rod-shaped member 10 such as a single pipe inserted into the pipe insertion part 54 functions as a vertical post to prevent the load placed on the loading part 2 from falling off the loading part 2, and is also used as a support post for an operator to grasp and push or pull when moving the cart 1A.

[0094] The rear end frame 52 is spanned between the left and right side surfaces of each of the pair of pipe insertion parts 54 and is disposed and attached in a posture where the axial direction is along the left and right direction.

[0095] As described above, the pipe insertion part 54 is provided such that its upper end face is located above the upper surface of the left and right frames 51. The upper surface of the rear end frame 52 attached to the left and right side surfaces of such a pipe insertion part 54 and the upper surface of the front and rear frames 32 of the first loading part 3 are adjusted to a positional relationship where they are horizontally aligned with each other (that is, they have the same height).

[0096] That is, the upper surfaces of the front and rear frames 32 of the first loading part 3, the upper surface of the front end frame 42 of the second loading part 4, and the upper surface of the rear end frame 52 of the third loading part 5 are all in a positional relationship of being horizontally aligned with each other (that is, having the same height).

[0097] The load is placed across the front end frame 42 of the second loading part 4, the pair of front and rear frames 32 of the first loading part 3, and the rear end frame 52 of the third loading part 5. As described above, the upper surfaces of the front and rear frames 32 of the first loading part 3, the upper surface of the front end frame 42 of the second loading part 4, and the upper surface of the rear end frame 52 of the third loading part 5 are all in a positional relationship of being horizontally aligned with each other (that is, having the same height). Therefore, the load placed on the loading part 2 does not tilt and a horizontal and stable posture is ensured.

[0098] The auxiliary frame 53 is attached so as to be spanned between the left and right side surfaces of each of the pair of left and right frames 51. Specifically, the auxiliary frame 53 is spanned between the left and right side surfaces of the front end portions of each of the pair of left and right frames 51 and is disposed and attached in a posture in which the axial direction is along the left - right direction.

[0099] The reinforcing member 56 is attached so as to be interposed between the rear end frame 52 and the auxiliary frame 53. Specifically, the upper surface of the rear end portion of the reinforcing member 56 is joined to the lower surface of the rear end frame 52 and the front end is joined to the rear surface of the auxiliary frame 53, and it is disposed and attached in a posture in which the axial direction is along the front - rear direction.

[0100] In the example shown in the figure, two reinforcing members 56 are provided. However, the number of the reinforcing members 56 is not limited to two, and may be appropriately set to an appropriate number in consideration of, for example, achieving an appropriate degree of reinforcement. Also, the reinforcing member 56 is not an essential configuration in the present invention and may not be provided.

[0101] The rear wheels 8 are attached to the lower surface sides of positions near the rear ends of each of the pair of left and right frames 51.

[0102] Although the rear wheel 8 may be a non-rotatable wheel with a fixed direction, it is preferably a caster wheel that can rotate horizontally and has a freely adjustable direction.

[0103] With the above configuration, the third loading portion 5 uses the pair of connecting frames 55 as guide members, and the rear wheel 8 rotates along the front-rear direction, so that the rear end frame 52 and the front-rear frame 32 remain parallel to each other, and the distance (in other words, the dimension) in the front-rear direction between the first loading portion 3 can change, that is, it can approach or move away from the first loading portion 3.

[0104] (Telescopic fixing mechanism) A load (not shown) is placed on the loading portion 2 of the cart 1A and transported. At this time, the dimension of the loading portion 2 of the cart 1A in the front-rear direction is adjusted according to the size of the load. Specifically, when the load is short, the second loading portion 4 and the third loading portion 5 are moved closer to the first loading portion 3, and the dimension of the loading portion 2 in the front-rear direction is shortened. On the other hand, when the load is long, the second loading portion 4 and the third loading portion 5 are moved away from the first loading portion 3, and the dimension of the loading portion 2 in the front-rear direction is lengthened.

[0105] Here, it is also conceivable that the first loading portion 3 is configured to be supported and floating by the pair of connecting frames 45 of the second loading portion 4 and the pair of connecting frames 55 of the third loading portion 5 via a pair of left and right frames 31 without wheels. However, in this case, when the second loading portion 4 or the third loading portion 5 approaches or moves away from the first loading portion 3, the friction when the connecting frames 45, 55 of the second loading portion 4 or the third loading portion 5 slide and are inserted or pulled out with respect to the left and right frames 31 of the first loading portion 3 increases. Therefore, the operation of moving the second loading portion 4 or the third loading portion 5 closer to or away from the first loading portion 3 cannot be performed smoothly, easily, and comfortably.

[0106] On the other hand, by providing the first load portion 3 with at least one wheel, the first load portion 3 will be supported and lifted by the wheel. Therefore, when the second load portion 4 or the third load portion 5 approaches or moves away from the first load portion 3, the connecting frames 45, 55 of the second load portion 4 or the third load portion 5 slide with respect to the left and right frames 31 of the first load portion 3 and are inserted or pulled out, and the friction at this time becomes small. For this reason, the operation of approaching or moving away the second load portion 4 or the third load portion 5 from the first load portion 3 can be performed smoothly, easily, and comfortably.

[0107] A telescopic fixing mechanism is provided so that the distance (in other words, dimension) in the front-rear direction between the first load portion 3 and the second load portion 4 can be maintained (in other words, the said distance can be fixed), and the distance in the front-rear direction between the first load portion 3 and the third load portion 5 can be maintained (in other words, the said distance can be fixed).

[0108] In the example shown in the figure, through holes (specifically, holes penetrating the cylindrical wall of the hollow cylindrical member along the vertical direction) communicating with the internal space of the left and right frames 31, which are hollow cylindrical members, are provided at positions near the front ends of each of the pair of left and right frames 31 of the first load portion 3.

[0109] In addition, a plurality of holes 48 (specifically, holes drilled along the vertical direction from the upper surface side, which may or may not be through holes penetrating the connecting frame 45 in the vertical direction) arranged along the front-rear direction while being spaced apart from each other at a predetermined interval are formed in each of the pair of connecting frames 45 of the second load portion 4.

[0110] In the example shown in the figure, seven holes 48 are formed in each of the connecting frames 45, but the number of holes 48 may be six or less or eight or more. For each of the connecting frames 45, for example, two holes 48 may be formed: one for maintaining the state where the carriage 1A is in the most extended state (i.e., the extended state; see FIGS. 1 to 3), and the other for maintaining the state where the carriage 1A is in the most shortened state (i.e., the shortened state; see FIGS. 4 to 6).

[0111] And a fixing pin 47 is provided which penetrates through the through holes at positions near the front ends of the left and right frames 31 of the first loading part 3 and is inserted into the holes 48 of the connecting frame 45 of the second loading part 4.

[0112] The fixing pin 47 may penetrate the left and right frames 31 and the connecting frame 45 (specifically, the holes 48) along the vertical direction (i.e., the tip of the fixing pin 47 protrudes downward from the lower surface of the left and right frames 31; see the example shown in the figure), or may penetrate the cylindrical wall on the upper surface side of the left and right frames 31 along the vertical direction and enter the connecting frame 45, and then be supported at the tip inside the connecting frame 45 (specifically, the bottom of the hole 48), or further, may penetrate the cylindrical wall on the upper surface side of the left and right frames 31 and the connecting frame 45 (specifically, the holes 48) along the vertical direction and then be supported at the tip on the cylindrical wall on the lower surface side of the left and right frames 31.

[0113] With the above structure, in a state where the distance in the front-rear direction between the first loading part 3 and the second loading part 4 becomes a desired distance, the fixing pin 47 penetrates through the through holes of the left and right frames 31 of the first loading part 3 and is inserted into the holes 48 of the connecting frame 45 of the second loading part 4, and the mutual positional relationship between the first loading part 3 and the second loading part 4 is fixed. That is, by selecting any one of the plurality of holes 48 arranged along the front-rear direction in each of the pair of connecting frames 45 of the second loading part 4, the distance in the front-rear direction between the first loading part 3 and the second loading part 4 is adjusted.

[0114] In the example shown in the figure, at each position near the rear end of each of the pair of left and right frames 31 of the first loading portion 3, through holes (specifically, holes penetrating the cylindrical wall of the hollow cylindrical member in the vertical direction) communicating with the internal space of the left and right frames 31, which are hollow cylindrical members, are provided.

[0115] Also, in each of the pair of connecting frames 55 of the third loading portion 5, a plurality of holes 58 (specifically, holes drilled along the vertical direction from the upper surface side, which may or may not be through holes penetrating the connecting frame 55 in the vertical direction) arranged along the front-rear direction while being spaced apart from each other at a predetermined interval are formed.

[0116] In the example shown in the figure, seven holes 58 are formed in each of the connecting frames 55, but the number of holes 58 may be six or less or eight or more. For each of the connecting frames 55, for example, two holes 58 may be formed: one for maintaining the state where the carriage 1A is in the most extended state (i.e., the extended state; refer to FIGS. 1 to 3) and the other for maintaining the state where the carriage 1A is in the most shortened state (i.e., the shortened state; refer to FIGS. 4 to 6).

[0117] And a fixing pin 57 is provided that penetrates through the through holes at positions near the rear ends of the left and right frames 31 of the first loading portion 3 and is inserted into the holes 58 of the connecting frames 55 of the third loading portion 5.

[0118] The fixing pin 57 may penetrate the left and right frames 31 and the connecting frames 55 (specifically, the holes 58) along the vertical direction (i.e., the tip of the fixing pin 57 protrudes downward from the lower surface of the left and right frames 31; refer to the example shown in the figure), or may penetrate the cylindrical wall on the upper surface side of the left and right frames 31 along the vertical direction and enter the connecting frames 55, and then be supported at the tip inside the connecting frames 55 (specifically, at the bottom of the holes 58), or further, may penetrate the cylindrical wall on the upper surface side of the left and right frames 31 and the connecting frames 55 (specifically, the holes 58) along the vertical direction and then be supported at the tip on the cylindrical wall on the lower surface side of the left and right frames 31.

[0119] With the above structure, in a state where the distance in the front-rear direction between the first loading part 3 and the third loading part 5 becomes a desired distance, the fixing pin 57 penetrates through the through holes of the left and right frames 31 of the first loading part 3 and is inserted into the hole 58 of the connecting frame 55 of the third loading part 5, thereby fixing the mutual positional relationship between the first loading part 3 and the third loading part 5. That is, by selecting any one of the plurality of holes 58 arranged along the front-rear direction of each of the pair of connecting frames 55 of the third loading part 5, the distance in the front-rear direction between the first loading part 3 and the third loading part 5 is adjusted.

[0120] With the telescopic fixing mechanism of the above configuration, a state where the distance (in other words, dimension) in the front-rear direction between the first loading part 3 and the second loading part 4 becomes a desired distance is maintained, and a state where the distance in the front-rear direction between the first loading part 3 and the third loading part 5 becomes a desired distance is maintained. Consequently, the dimension in the front-rear direction of the loading part 2 can be adjusted to a desired dimension.

[0121] The configuration of the telescopic fixing mechanism is not limited to the above configuration in the example shown in the figure. For example, it may be a mechanism in which a wing bolt penetrating through the through holes of the left and right frames 31 of the first loading part 3 is provided, and by tightening the wing bolt at a position closer to the front end of the left and right frames 31, the tip of the wing bolt is pressed against the outer peripheral surface of the connecting frame 45 of the second loading part 4, thereby fixing the mutual positional relationship between the left and right frames 31 of the first loading part 3 and the connecting frame 45 of the second loading part 4. Also, by tightening the wing bolt at a position closer to the rear end of the left and right frames 31, the tip of the wing bolt is pressed against the outer peripheral surface of the connecting frame 55 of the third loading part 5, thereby fixing the mutual positional relationship between the left and right frames 31 of the first loading part 3 and the connecting frame 55 of the third loading part 5 (in this case, holes 48 and 58 are not formed in the connecting frame 45 of the second loading part 4 and the connecting frame 55 of the third loading part 5).

[0122] (Stacked) FIG. 7 is a side view showing a state in which the carts 1A according to Embodiment 1 are stacked in the most shortened state. When the carts 1A according to Embodiment 1 are stored in a warehouse or the like, in order to save storage space, a plurality of carts 1A are stacked and stored in a stacked manner in the vertical direction.

[0123] Specifically, the cart 1A has the stacking receiving members 36 of the upper cart 1A in the stacked state placed on the upper surfaces of the pair of front and rear frames 32 of the lower cart 1A in the stacked state, and they are stacked in the vertical direction. That is, the stacking receiving member 36 is a member that contacts a part (specifically, the front and rear frames 32) of the lower cart 1A in the state where they are stacked in the vertical direction and stacked.

[0124] The stacking receiving member 36 forms a recess (in other words, a groove, or a pair of front and rear convex portions) that is open at the lower end surface (in other words, downward opening) and extends along the left - right direction. For this reason, when the stacking receiving members 36 of the upper cart 1A are placed on the upper surfaces of the pair of front and rear frames 32 of the lower cart 1A respectively, the upper cart 1A does not shift in the front - rear direction with respect to the lower cart 1A, and a plurality of carts 1A can be stacked in a stable state.

[0125] Although the cart 1A according to Embodiment 1 is preferably stacked in the shortened state for ensuring stability when stacked and further realizing space saving, it may also be stacked in the extended state.

[0126] (Embodiment 2) FIGS. 8 and 9 are views showing the structure of the cart 1B according to Embodiment 2 as an example of a specific configuration aspect of the cart according to the present invention. FIG. 8 is a view showing the cart 1B in the most shortened state (i.e., the shortened state), and FIG. 9 is a view showing the cart 1B in the most extended state (i.e., the extended state).

[0127] Although the forms of the stacking receiving portion and the pipe insertion portion of the first loading portion 3 of the cart 1B according to the second embodiment are different from those of the first embodiment described above, other configurations are the same as those of the first embodiment. For configurations equivalent to those of the first embodiment, the same reference numerals are given and the description thereof is omitted. Note that the configurations of the second loading portion 4 and the third loading portion 5 are the same as those of the first embodiment described above.

[0128] The first loading portion 3 of the cart 1B according to the second embodiment has a stacking receiving portion 39 instead of the stacking receiving member 36. Note that it does not have the reinforcing strut 35.

[0129] The stacking receiving portion 39 is formed and attached as a member that forms a recess with an open lower end surface (in other words, an opening facing downward) at the lower ends of a pair of stacking receiving struts 34 (referred to as "a pair of front stacking receiving struts 34f") respectively attached to the lower surfaces of the positions near the front ends of the pair of left and right frames 31, and at the lower ends of a pair of stacking receiving struts 34 (referred to as "a pair of rear stacking receiving struts 34b") respectively attached to the lower surfaces of the positions near the rear ends of the pair of left and right frames 31.

[0130] The stacking receiving portion 39 is formed, for example, in a rectangular dish shape or a circular bowl shape in a plan view (note that it is arranged with an open lower end surface and an opening facing downward). The recess of the stacking receiving portion 39 is formed to be large enough to allow the upper end surface of the pipe insertion portion 37 to enter and cover.

[0131] The stacking receiving portion 39 is attached, that is, attached as a pair of members constituted by separate members to the lower ends of a pair of front stacking receiving struts 34f respectively (referred to as "a pair of front stacking receiving portions 39f"), and also attached as a pair of members constituted by separate members to the lower ends of a pair of rear stacking receiving struts 34b respectively (referred to as "a pair of rear stacking receiving portions 39b").

[0132] The longitudinal reinforcing frame 38 is attached by joining the upper surface of one end in the axial direction (that is, the front-rear direction) to the lower surface of the front-rear frame 32 and joining the other end to the front-rear side surfaces of the lateral reinforcing frame 33.

[0133] The pipe insertion part 37 is disposed above the stacked support column 34 in a posture where the axial direction is along the vertical direction, and is attached via the left and right frames 31 (specifically, on the upper surfaces of the left and right frames 31).

[0134] The pipe insertion part 37 is attached as a pair of members, respectively, above each of the pair of front stacked support columns 34f (referred to as "a pair of front pipe insertion parts 37f"), and is also attached as a pair of members, respectively, above each of the pair of rear stacked support columns 34b (referred to as "a pair of rear pipe insertion parts 37b").

[0135] Of the pair of front and rear frames 32, the front front and rear frame 32 is bridged between the left and right side surfaces of each of the pair of front pipe insertion parts 37f, and is disposed and attached in a posture where the axial direction is along the left and right direction. Also, of the pair of front and rear frames 32, the rear front and rear frame 32 is bridged between the left and right side surfaces of each of the pair of rear pipe insertion parts 37b, and is disposed and attached in a posture where the axial direction is along the left and right direction.

[0136] In the example shown in the figure, in Embodiment 1, the pipe insertion parts 37 attached to the upper surface sides of the central portions in the axial direction (i.e., the front and rear directions) of each of the pair of left and right frames 31 are not attached. However, also in Embodiment 2, similar to Embodiment 1, the pipe insertion parts 37 may be attached to the upper surface sides of the central portions in the axial direction (i.e., the front and rear directions) of each of the pair of left and right frames 31.

[0137] (Stacked / Shortened state) When the carriage 1B according to Embodiment 2 is stored in a warehouse or the like, in order to save the storage space, a plurality of carriages 1B are stacked and stored in the vertical direction.

[0138] The carriage 1B is specifically configured such that, when stacked, the pair of front pipe insertion portions 37f of the lower carriage 1B and the upper ends of the pair of rear pipe insertion portions 37b respectively receive the pair of front stacking receiving portions 39f and the pair of rear stacking receiving portions 39b of the upper carriage 1B in the stacked state, and they are stacked in the vertical direction. That is, the front stacking receiving portion 39f and the rear stacking receiving portion 39b are members that come into contact with a part of the lower carriage 1B (specifically, the front pipe insertion portion 37f and the rear pipe insertion portion 37b) in the stacked state where they are stacked in the vertical direction.

[0139] The front stacking receiving portion 39f and the rear stacking receiving portion 39b form recesses with open lower end faces (in other words, downward openings). For this reason, when the front stacking receiving portion 39f or the rear stacking receiving portion 39b of the upper carriage 1B is placed on each of the upper ends of the pair of front pipe insertion portions 37f and the pair of rear pipe insertion portions 37b of the lower carriage 1B, the upper carriage 1B does not shift in the front-rear direction or the left-right direction with respect to the lower carriage 1B, and a plurality of carriages 1B can be stacked in a stable state.

[0140] (Stacked / Extended State) FIG. 10 is a side view showing a state in which the carriage 1B according to Embodiment 2 is stacked in the most extended state. In this case, when the carriage 1B according to Embodiment 2 is stored in a warehouse or the like with the load 9 placed on the loading portion 2, in order to save storage space, a plurality of carriages 1B are stacked and stored in the vertical direction.

[0141] In this case, a rod-shaped member 10 such as a single pipe is detachably inserted into each of the pair of front pipe insertion portions 37f and the pair of rear pipe insertion portions 37b.

[0142] And the carriage 1B has rod-shaped members 10 inserted into the pair of front pipe insertion portions 37f of the lower carriage 1B in the stacked state respectively, and at the upper ends of the rod-shaped members 10 inserted into the pair of rear pipe insertion portions 37b respectively, a pair of front stacking receiving portions 39f and a pair of rear stacking receiving portions 39b of the upper carriage 1B in the stacked state are placed, and they are stacked in the vertical direction. That is, the front stacking receiving portion 39f and the rear stacking receiving portion 39b are members that come into contact with a part of the lower carriage 1B (specifically, the rod-shaped member 10) in the stacked state stacked in the vertical direction.

[0143] When a plurality of carriages 1B are stacked vertically with the load 9 placed on the loading portion 2, a reinforcing frame body 11 in the shape of a rectangular frame in plan view may be mounted.

[0144] As shown in FIG. 11, the reinforcing frame body 11 has corner portions 111 that penetrate the rod-shaped members 10 inserted into the pair of front pipe insertion portions 37f and the pair of rear pipe insertion portions 37b respectively, and connecting frames 112 between these corner portions 111.

[0145] That is, the corner portions 111 are arranged at the positions of the vertices of a (virtual) rectangle in plan view respectively.

[0146] Also, the connecting frames 112 are disposed between the corner portions 111, and both ends in the axial direction of each are joined to the side surfaces of the corner portions 111, and connect the corner portions 111 so as to form a rectangular frame in plan view.

[0147] The reinforcing frame body 11 has rod-shaped members 10 (that is, a total of four) inserted into the pair of front pipe insertion portions 37f and the pair of rear pipe insertion portions 37b respectively, and for the carriage 1B with the load 9 placed on the loading portion 2, each of the four corner portions 111 is mounted by penetrating the rod-shaped member 10.

[0148] The reinforcing frame body 11 may be structured to be detachable from the rod-shaped member 10. Alternatively, the reinforcing frame body 11 may be joined to the rod-shaped member 10 so that the four rod-shaped members 10 and the reinforcing frame body 11 have an integral structure. When the four rod-shaped members 10 and the reinforcing frame body 11 have an integral structure, the rod-shaped members 10 are configured to be detachably inserted into the front pipe insertion portion 37f and the rear pipe insertion portion 37b, so that the integral structure of the four rod-shaped members 10 and the reinforcing frame body 11 is configured to be detachable from the carriage 1B.

[0149] When the reinforcing frame body 11 is structured to be detachable from the rod-shaped member 10, as an anti-slip measure and a position fixing member for the corner portion 111 with respect to the rod-shaped member 10 when the reinforcing frame body 11 is mounted, a metal annular member may be pre-welded and attached to the rod-shaped member 10, a resin annular member may be pre-attached so as to be able to exert a predetermined position fixing force by the frictional force with the rod-shaped member 10, or a member functioning as a wedge may be inserted into the gap between the rod-shaped member 10 and the corner portion 111. As a result, the position of the corner portion 111 is fixed at a predetermined position (in other words, height) in the axial direction (i.e., the vertical direction) of the rod-shaped member 10, and thus the position of the reinforcing frame body 11 is fixed.

[0150] Note that it is also possible to stack a plurality of carriages 1B vertically with the load 9 placed on the loading portion 2 of the carriage 1B in the most shortened state. Also in this case, the rectangular frame-shaped reinforcing frame body 11 may be mounted in a plan view.

[0151] Even when the reinforcing frame body 11 is mounted, the upper carriage 1B does not shift in the front-rear direction or the left-right direction with respect to the lower carriage 1B, and a plurality of carriages 1B can be stacked in a stable state.

[0152] When the reinforcing frame body 11 is attached, by means of the reinforcing frame body 11, the rod-shaped members 10 that are vertically erected at each of the four corners of the first loading part 3 of the carriage 1B are mutually constrained in the four directions of front, rear, left, and right, and the rod-shaped members 10 of the carriage 1B in the lower stage in particular in the state of being stacked vertically are stabilized (in other words, the support strength of the rod-shaped members 10 is improved; specifically, buckling of the rod-shaped members 10 is particularly prevented).

[0153] (Function and effect) According to the carriages 1A and 1B according to the embodiment, it is possible to adjust the dimensions of the loading part 2 according to the size of the load.

[0154] According to the carriages 1A and 1B according to the embodiment, it is possible to stack and store the carriages 1A or the carriages 1B in the vertical direction.

[0155] As described above, the embodiments of the present invention have been described. However, the specific configuration mode of the present invention is not limited to the above embodiments, and forms in which modifications and changes within the scope not departing from the gist of the present invention are added to the above embodiments are also included in the present invention.

[0156] For example, in the above-described embodiments, the stacking receiving members 36 of the upper carriage 1A are placed on the upper surfaces of the respective pair of front and rear frames 32 of the lower carriage 1A (Embodiment 1), or the pair of front stacking receiving portions 39f and the pair of rear stacking receiving portions 39b of the upper carriage 1B are placed on the upper ends of the respective pair of front pipe insertion portions 37f and the pair of rear pipe insertion portions 37b of the lower carriage 1B (Embodiment 2), so that a plurality of carriages 1A and 1B are stacked in the vertical direction. However, the stacking mode is not limited to the modes in the above-described Embodiments 1 and 2. For example, the wheels 6, 7, and 8 of the upper carriage may be placed on the upper surfaces of the top plates (otherwise, mounting pedestals) of the wheels 6, 7, and 8 of the lower carriage, so that a plurality of carriages 1A and 1B are stacked in the vertical direction. In this case, the stacking receiving columns 34, the reinforcing columns 35, and the stacking receiving members 36 (Embodiment 1) and the stacking receiving columns 34 and the stacking receiving portions 39 (Embodiment 2) as the stacking receiving portions do not have to be provided.

Explanation of Reference Numerals

[0157] 1A Carriage (Embodiment 1) 1B Carriage (Embodiment 2) 2 Loading portion 3 First loading portion 31 Left and right frames 311 Stopper holes (near the front end) 312 Stopper holes (near the rear end) 32 Front and rear frames 33 Short-side reinforcing frames 34 Stacking receiving columns 34f Front-side stacking receiving column (Embodiment 2) 34b Rear-side stacking receiving column (Embodiment 2) 35 Reinforcing columns (Embodiment 1) 36 Stacking receiving members (Embodiment 1) 37 Pipe insertion portions 37f Front-side pipe insertion portion (Embodiment 2) 37b Rear-side pipe insertion portion (Embodiment 2) 38 Longitudinal reinforcing frames 39 Stacking receiving portions (Embodiment 2) 39f Front-stage receiving part (Embodiment 2) 39b Rear-stage receiving part (Embodiment 2) 4 Second loading part 41 Left and right frames 42 Front-end frame 43 Auxiliary frame 44 Pipe insertion part 45 Connecting frame 46 Reinforcing member 47 Fixing pin 48 Hole 49 Supporting member 5 Third loading part 51 Left and right frames 52 Rear-end frame 53 Auxiliary frame 54 Pipe insertion part 55 Connecting frame 56 Reinforcing member 57 Fixing pin 58 Hole 59 Supporting member 6 Central support wheel 7 Front-side wheel 8 Rear-side wheel 9 Load 10 Rod-shaped member 11 Reinforcing frame body 111 Corner 112 Connecting frame

Claims

1. a first load part, a second load part whose distance from the first load part changes, a third load part whose distance from the first load part changes, and has, the first load part is located between the second load part and the third load part, the first load part includes at least one wheel, a cart characterized by this.

2. the second load part and the third load part include a connecting frame, the first load part includes a hollow cylindrical member into which the connecting frame is inserted or pulled out, the axial direction of the connecting frame and the axial direction of the hollow cylindrical member are along the direction in which the distance changes, the cart according to claim 1, characterized by this.

3. a telescopic fixing mechanism for fixing the distance between the first load part and the second load part, a telescopic fixing mechanism for fixing the distance between the first load part and the third load part, and has, the cart according to claim 1, characterized by this.

4. the first load part, the second load part, and the third load part include a pipe insertion part into which a rod-shaped member is detachably inserted, the cart according to claim 1, characterized by this.

5. the first load part includes a member that contacts a part of the lower cart in a state where they are stacked vertically in a stepped manner, the cart according to claim 1, characterized by this.

6. the first load part includes a member that contacts the upper end of the rod-shaped member inserted into the pipe insertion part of the first load part of the lower cart in a state where they are stacked vertically in a stepped manner, the cart according to claim 4, characterized by this.

Images