Cart transport auxiliary vehicle unit

Abstract

To achieve conveyance with a plurality of sets of two cage carriages arranged in parallel easily coupled in series, and to avoid an increase in turning radius in direction change.SOLUTION: A carriage conveyance auxiliary carrier unit is used which consists of a carriage conveyance auxiliary carrier and a coupling bar 90 coupled thereto, and while a coupling pin 23 provided on a second bar 20 of one of two carriage conveyance auxiliary carriers is inserted into a coupling hole of a coupling bar 90, a coupling groove of the coupling bar 90 is hooked to a coupling frame 11 provided on a first bar 10 of the other carriage conveyance auxiliary carrier to couple the plurality of carriage conveyance auxiliary carriers in series.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a cart transport auxiliary vehicle unit for transporting multiple sets of two carts arranged in parallel and connected in series. [Background technology]

[0002] Conventionally, carts each having a metal pipe standing on a bottom plate have been used to transport and store goods, articles, and parts in retail stores such as supermarkets, logistics centers, factories, etc. Here, a technology for connecting carts in series for transporting them is disclosed in, for example, Patent Document 1.

[0003] The technology disclosed in Patent Document 1 involves attaching a connecting piece and a connecting receiving piece that can engage with the connecting piece to the pipes of the trolleys, and engaging the connecting piece attached to one trolley with the connecting receiving piece attached to another trolley, thereby connecting the trolleys in series and transporting them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-205818 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as mentioned above, in a system in which a connecting piece and an engageable connecting receive piece are attached to the pipes of the trolleys, and the connecting piece attached to one trolley is engaged with the connecting receive piece attached to another trolley, the connecting piece and the connecting receive piece must be attached to each of the trolleys to be connected, which creates the problem of increased effort and cost.

[0006] Furthermore, in recent years, it has been considered to improve efficiency by arranging two carts in parallel for transportation. However, in order to transport multiple sets of two carts arranged in parallel by connecting them in series, it is necessary to attach a connecting piece and a connecting support piece to each of the carts being transported in parallel, which creates the problem of additional work.

[0007] In addition, the type of cart that is commonly used is a six-wheel cart that has a rectangular bottom plate, with a swivel wheel that can be rotated to any direction attached to each of the four corners of the bottom plate, and a fixed wheel that is larger in diameter than the swivel wheel and whose direction does not change with the longitudinal direction of the bottom plate as the direction of travel attached to approximately the center of the long side of the bottom plate.However, when such carts are connected in series for transportation using the technology disclosed in Patent Document 1, the fixed wheels are always in contact with the ground and the swivel wheels change direction by sometimes touching the ground and sometimes not, which creates the problem of a large turning radius when changing direction.

[0008] The present invention has been made in consideration of the problems associated with the conventional technology as described above, and aims to provide a cart transporting auxiliary vehicle unit that can easily connect multiple sets of two carts arranged in parallel in series for transport, and can avoid the turning radius becoming large when changing direction. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides A cart transport auxiliary vehicle unit for transporting a plurality of sets of two carts arranged in parallel and having rectangular bottom plates connected in series, A cart transport auxiliary vehicle that holds the two carts in parallel; A connecting bar that connects a plurality of the cart transport auxiliary vehicles in series, The cart transport auxiliary vehicle is a first bar that abuts one of the short sides of the bottom plate when the two carriages are arranged side by side and has a first connection receiving portion that engages with one end of the connection bar; a second bar extending from a central portion of the first bar in a direction perpendicular to the first bar by at least the length of the long side of the bottom plate, the second bar having a second connection receiving portion at an end opposite to the first bar and having wheels attached to its underside; The first bar and the second bar hold the cart along two adjacent sides of the bottom plate, The connecting bar has at one end a first engagement portion for engaging with the first connecting receiving portion of one of the two cart transport auxiliary vehicles being connected, and at the other end a second engagement portion for engaging with the second connecting receiving portion of the other of the two cart transport auxiliary vehicles being connected, and is configured to be rotatable horizontally relative to the second bar when the second engagement portion engages with the second connecting receiving portion, and the length from the first engagement portion to the second engagement portion is greater than or equal to the length of the short side of the bottom plate.

[0010] In the present invention configured as described above, a second coupling receiving portion is provided at the rear end of the second bar extending at least the length of the long side of the bottom plate between the two carts arranged in parallel, and the second engagement portion provided on the coupling bar engages with this second coupling receiving portion, and the first engagement portion provided on the coupling bar engages with the first coupling receiving portion of the first bar of the other cart transport auxiliary vehicle, so that the two carts arranged in parallel are coupled in series in multiple sets for transport, and thus the two carts arranged in parallel can be easily coupled in series in multiple sets for transport. In addition, the coupling bar is configured to be horizontally rotatable with respect to the second bar when the second engagement portion engages with the second coupling receiving portion, and the length from the first engagement portion to the second engagement portion is equal to or longer than the length of the short side of the bottom plate of the cart, so that the angle between the carts coupled in series can be reduced to 90 degrees when changing direction, and the turning radius can be prevented from becoming large.

[0011] Furthermore, if a cushioning material of a certain thickness is attached to the surface of the first bar opposite the second bar, even if an item loaded on the trolley protrudes from the bottom plate, as long as the amount of protrusion is less than the thickness of the cushioning material, when the angle between the trolleys connected in series is reduced to 90 degrees, the protruding item will be prevented from colliding with the connected trolley transport auxiliary vehicle. Effect of the Invention

[0012] According to the present invention, a second connecting receiving portion is provided at the rear end of a second bar extending at least the length of the long side of the bottom plate between two trolleys arranged in parallel, and the second engaging portion provided on the connecting bar engages with this second connecting receiving portion, and the first engaging portion provided on the connecting bar engages with the first connecting receiving portion of the first bar of another trolley transport auxiliary vehicle, thereby connecting multiple sets of two trolleys arranged in parallel in series for transport. Therefore, multiple sets of two trolleys arranged in parallel can be easily connected in series for transport. Furthermore, the connecting bar is configured to be rotatable horizontally relative to the second bar when the second engaging portion engages with the second connecting receiving portion, and the length from the first engaging portion to the second engaging portion is equal to or greater than the length of the short side of the bottom plate of the trolley, so that the angle between the trolleys connected in series when changing direction can be reduced to 90 degrees, thereby avoiding an increase in the turning radius.

[0013] Furthermore, in a case where a cushioning material of a certain thickness is attached to the surface of the first bar opposite the second bar, even if an item loaded on the trolley protrudes from the bottom plate, as long as the amount of protrusion is less than the thickness of the cushioning material, it is possible to prevent the protruding item from colliding with the connected trolley transport auxiliary vehicle when the angle between the trolleys connected in series is reduced to 90 degrees. [Brief description of the drawings]

[0014] [Figure 1] 1A and 1B are diagrams showing one embodiment of a cart transport auxiliary vehicle constituting a cart transport auxiliary vehicle unit of the present invention, in which (a) is a diagram seen from above, and (b) is a diagram seen from the side. [Diagram 2] 2A and 2B are views of the cart transport auxiliary vehicle shown in FIG. 1 as seen from the direction of movement, where (a) is a view from the first bar side, and (b) is a view from the opposite side. [Diagram 3] 2A to 2C are diagrams showing an example of a cart transported using the cart transport auxiliary vehicle shown in FIG. 1, where (a) is a diagram seen from one side, (b) is a diagram seen from the other side, and (c) is a diagram seen from above. [Figure 4] 4A and 4B are diagrams showing the six-wheeled cart shown in FIG. 3 held by the cart transport auxiliary vehicle shown in FIG. 1 and FIG. 2, where (a) is a diagram seen from above and (b) is a diagram seen from the side. [Diagram 5] 4 is a diagram for explaining the operation when the six-wheeled cart shown in FIG. 3 is held by the cart transport auxiliary vehicle shown in FIGS. 1 and 2. FIG. [Figure 6] 6 is a diagram for explaining an operation when the six-wheeled cart held by the cart transport auxiliary vehicle as shown in FIG. 5 is detached. FIG. [Figure 7] 3A and 3B are diagrams showing an embodiment of a connecting bar for connecting the cart transport auxiliary vehicles shown in FIGS. 1 and 2, where (a) is a top view and (b) is a side view. [Figure 8] 8 is a diagram showing a state in which the cart transport auxiliary vehicles shown in FIGS. 1 and 2 are connected in series using the connecting bar shown in FIG. 7. FIG. [Figure 9] 8 is a diagram for explaining the effect of the length from the connecting groove to the connecting hole of the connecting bar shown in FIG. 7 being equal to or greater than the length of the short side of the bottom plate of the six-wheeled bogie shown in FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0016] Fig. 1 shows one embodiment of a cart transport auxiliary vehicle constituting the cart transport auxiliary vehicle unit of the present invention, where (a) is a view from above and (b) is a view from the side. Fig. 2 shows the cart transport auxiliary vehicle 1 shown in Fig. 1 as seen from the direction of movement, where (a) is a view from the first bar 10 side and (b) is a view from the opposite side. Note that in Fig. 2, the connection device 30 shown in Fig. 1 is omitted.

[0017] As shown in Figures 1 and 2, the cart transport auxiliary vehicle in this embodiment is configured to have a first bar 10 extending in one direction and a second bar 20 extending in a direction perpendicular to the first bar 10.

[0018] The first bar 10 is abutted by the carriages in parallel, which will be described later. A connecting device 30 is attached to the side opposite to the surface where the carriages are in parallel contact, and the first bar 10 is attached to a moving vehicle that transports the carriages by power such as electricity via the connecting device 30. A protector 12 made of rubber or resin is attached to each area where the carriages are in contact on the surface where the carriages are in parallel contact. An H-shaped connecting frame 11, which serves as a first connecting receiving portion, is provided standing up in the center of the first bar 10. In addition, a third guide 60 is attached near each end of the first bar 10. The guide 60 extends from the first bar 10 in the direction in which the carriages come in contact, and on the inner surface of the guide 60, an area of ​​length L2 from the first bar 10 is an abutment portion 61 where the carriages come in contact, and the area beyond that is an inclined surface 62 so that the width in the direction in which the first bar 10 extends becomes narrower as it approaches the tip. A swivel wheel 72 whose orientation is variable is attached to the underside of each of the two ends of the first bar 10.

[0019] One end of the second bar 20 is connected to the center of the first bar 10, and extends from this connection in the direction in which the cart comes into contact with the first bar 10, i.e., in the opposite direction to the moving vehicle to which it is attached via the connection device 30. A first guide 40 is provided at the end of the second bar 20 that is the connection part with the first bar 10, protruding by a distance D1 in the direction in which the first bar 10 extends. The guide 40 has an area of ​​a first length L1, which is shorter than the length L2, from the first bar 10 as an abutment part 41 with which the cart comes into contact, and the end of the abutment part 41 opposite the first bar 10 is connected to the second bar 20 via an inclined surface 42. Since the length L1 of the contact portion 41 of the guide 40 is shorter than the length L2 of the contact portion 61 of the guide 60, the distance from the first bar 10 to the end of the contact portion 61 of the guide 60 on the opposite side to the first bar 10 is longer than the distance from the first bar 10 to the end of the contact portion 41 of the guide 40 on the opposite side to the first bar 10. The contact portion 41 is parallel to the second bar 20 at a position separated by a first distance D1 from the second bar 20 in the direction in which the first bar 10 extends, since the guide 40 protrudes by D1 in the direction in which the first bar 10 extends. A second guide 50 protruding by D1 in the direction in which the first bar 10 extends is provided on the opposite side of the second bar 20 from the guide 40. The protruding tip of the guide 50 serves as the contact portion 51 with which the cart abuts. The abutment portion 51 is parallel to the second bar 20 at a position separated by a first distance D1 from the second bar 20 in the direction in which the first bar 10 extends, because the guide 50 protrudes by D1 in the direction in which the first bar 10 extends. A fixed wheel 71 whose traveling direction is constant as the direction in which the second bar 20 extends is attached to the underside of the central portion of the second bar 20. The fixed wheel 71 has a larger diameter than the two free wheels 72 attached to the first bar 10, so that when the mobile vehicle is attached via the connection device 30, the free wheels 72 are slightly raised. A connecting pole 21 serving as a second connecting receiver is provided upright at the end of the second bar 20 opposite the first bar 10. A pin base 22 is provided near the tip of the connecting pole 21 so that its upper surface is at the same height as the H-shaped horizontal bar of the connecting frame 11, and a connecting pin 23 stands upright on the pin base 22.In addition, second bar 20 is provided with auxiliary bar 24, one end of which is fixed to second bar 20 and the other end of which is fixed to connecting pole 21. A swivel wheel 73, the diameter of which is smaller than that of fixed wheel 71 and whose orientation is variable, is attached to the underside of second bar 20 near the end opposite first bar 10.

[0020] The height of the first bar 10 and the second bar 20 is equal to the height of the floor plate of the bogie, which will be described later.

[0021] A method of using the cart transport auxiliary vehicle 1 configured as above will be described below.

[0022] First, a cart transported by the cart transport auxiliary vehicle 1 shown in FIG. 1 will be described.

[0023] FIG. 3 is a diagram showing an example of a cart transported using the cart transport auxiliary vehicle 1 shown in FIG. 1, where (a) is a view from one side, (b) is a view from the other side, and (c) is a view from above.

[0024] As shown in FIG. 3, the cart transported by the cart transport auxiliary vehicle 1 shown in FIG. 1 is a six-wheel cart 80 configured by two side frames 82 standing on a bottom plate 81. The two side frames 82 are configured by combining metal pipes vertically and horizontally, and are attached to the two short sides of the rectangular bottom plate 81 so as to stand opposite each other. On the lower surface of the bottom plate 81, free wheels 84 whose orientation is variable are attached to each of the four corners of the bottom plate 81, and fixed wheels 83 whose orientation is invariable with the longitudinal direction of the bottom plate 81 as the traveling direction are attached to the approximately central portion of the long side of the bottom plate 81. The fixed wheels 83 have a larger diameter than the four free wheels 84, so that of the two fixed wheels 83 and the four free wheels 84, the two fixed wheels 83 are always in contact with the ground, and the four free wheels 84 are in contact with the ground or not depending on the moving direction of the six-wheel cart 80, making it easy for the basket 80 to move in any direction.

[0025] Figure 4 shows the six-wheeled cart 80 shown in Figure 3 being held by the cart transport auxiliary vehicle 1 shown in Figures 1 and 2, where (a) is a view from above and (b) is a view from the side.

[0026] 3, in each of the two regions surrounded by the first bar 10, the second bar 20, and the guide 60, the short side of the two adjacent sides of the bottom plate 81 is arranged along the first bar 10 and the long side is arranged along the second bar 20, and one short side of the bottom plate 81 abuts against the first bar 10 via the protector 12, and a part of the long side of the bottom plate 81 abuts against the abutment parts 41, 51, and 61 of the guides 40, 50, and 60, respectively, so that the guides are held in parallel. Therefore, the abutment part 61 of the guide 60 faces the abutment part 41 of the guide 40 at a position spaced apart from the abutment part 41 of the guide 40 by the length of the short side of the bottom plate 81 of the six-wheeled cart 80 in the direction away from the second bar 20, and is parallel to the second bar 20.

[0027] The cart transport auxiliary vehicle 1 holding the six-wheeled cart 80 is attached to the moving vehicle 100, which transports the six-wheeled cart 80 by power such as electricity, via the connecting device 30. The six-wheeled cart 80 is then transported together with the cart transport auxiliary vehicle 1 by the power of the moving vehicle 100. At that time, the two six-wheeled carts 80 held by the cart transport auxiliary vehicle 1 are each attached with a fastener such as a chain (not shown) to the side frame 82 located on the opposite side to the first bar 10, thereby preventing the carts 80 from coming off the cart transport auxiliary vehicle 1 during transportation. In addition, the free wheels 72 are attached to the underside near both ends of the first bar 10, thereby preventing the first bar 10 from tilting.

[0028] Next, the operation of holding the six-wheeled cart 80 shown in FIG. 3 by the cart transport auxiliary vehicle 1 shown in FIGS. 1 and 2 will be described.

[0029] FIG. 5 is a diagram for explaining the operation when the six-wheeled cart 80 shown in FIG. 3 is held by the cart transport auxiliary vehicle 1 shown in FIGS. 1 and 2, and is a diagram seen from above.

[0030] As described above, the six-wheeled cart 80 shown in Fig. 3 has two fixed wheels 83 and four swivel wheels 84 whose orientation is invariable with the longitudinal direction of the bottom plate 81 as the travel direction, and the two fixed wheels 83 are always on the ground, while the four swivel wheels 84 move while being in contact with the ground or not depending on the direction of movement of the six-wheeled cart 80. Therefore, even when changing direction, the fixed wheels 83 whose orientation is invariable are always on the ground, so that a large force that tends to move in the longitudinal direction of the bottom plate 81 is applied to the approximately central portion of the longitudinal direction of the bottom plate 81 to which the fixed wheels 83 are attached, and the bottom plate 81 is less likely to deviate in the lateral direction. Therefore, when changing direction, the corners of the bottom plate 81 are swung outward relative to the fixed wheels 83 to change direction.

[0031] Therefore, when the six-wheeled cart 80 shown in Fig. 3 is held by the cart transport auxiliary vehicle 1 shown in Fig. 1 and Fig. 2, the six-wheeled cart 80 is advanced into the area surrounded by the first bar 10 and the second bar 20 as shown in Fig. 5(a), and first, as shown in Fig. 5(b), the front side of the six-wheeled cart 80 in the approach direction is swung toward the second bar 20 when the fixed wheels 83 of the six-wheeled cart 80 are aligned with the guide 50. At that time, since the abutment portion 51 of the guide 50 is separated from the second bar 20 by a distance D1, the front side of the six-wheeled cart 80 in the approach direction can be swung toward the second bar 20 by the distance D1.

[0032] Then, when the six-wheeled cart 80 is further advanced by sliding the side surface of the second bar 20 while the corner portion on the front side in the approach direction of the bottom plate 81 of the six-wheeled cart 80 is in contact with the second bar 20, the corner portion on the front side in the approach direction of the bottom plate 81 of the six-wheeled cart 80 abuts against the guide 40. The guide 40 is provided with an abutment portion 41 that abuts against the bottom plate 81 of the six-wheeled cart 80 it holds, and an inclined surface 42 that connects the abutment portion 41 and the second bar 20. Therefore, as shown in FIG. 5(c), the six-wheeled cart 80 advances while the corner portion on the front side in the approach direction of the bottom plate 81 of the six-wheeled cart 80 slides on the inclined surface 42, and the corner portion on the front side in the approach direction of the bottom plate 81 of the six-wheeled cart 80 abuts against the abutment portion 41 of the guide 40. In this way, the end of the abutment portion 41 of the guide 40 opposite the first bar 10 is connected to the second bar 20 via the inclined surface 42, so that when the six-wheeled cart 80 is held in a state for transporting in parallel, the corner of the bottom plate 81 can be guided to the abutment portion 41 of the guide 40 by sliding it over the side of the second bar 20 and this inclined surface 42.

[0033] Thereafter, by further advancing the six-wheeled cart 80, as shown in Fig. 5(d), one short side of the bottom plate 81 abuts against the first bar 10 via the protector 12, and parts of the long sides of the bottom plate 81 abut against the abutment parts 41, 51, and 61 of the guides 40, 50, and 60, respectively, so that the six-wheeled cart 80 is held by the cart transport auxiliary vehicle 1. At that time, since the length L2 of the abutment part 61 of the guide 60 from the first bar 10 is longer than the length L1 of the abutment part 41 of the guide 40 from the first bar 10, the bottom plate 81 is likely to enter between the guides 40 and 60 even if the front side of the six-wheeled cart 80 in the advancing direction moves away from the second bar 20 and swings left and right.

[0034] FIG. 6 is a diagram for explaining the action when the six-wheeled cart 80 held by the cart transport auxiliary vehicle 1 as shown in FIG. 5 is detached, and is a diagram seen from above.

[0035] When the six-wheeled cart 80 held by the cart transport auxiliary vehicle 1 is removed as shown in FIG. 5, the six-wheeled cart 80 is removed in a direction away from the first bar 10 as shown in FIG. 6(a), and first, as shown in FIG. 6(b), the front side of the six-wheeled cart 80 in the removal direction is swung away from the second bar 20. At that time, as described above, the approximately central portion in the longitudinal direction of the bottom plate 81 to which the fixed wheel 83 is attached is not easily displaced in the short direction of the bottom plate 81, but since the contact portion 41 of the guide 40 is separated from the second bar 20 by a distance D1, it is possible to swing the rear side of the six-wheeled cart 80 in the removal direction toward the second bar 20 by the distance D1, and thus the front side of the six-wheeled cart 80 in the removal direction can be swung away from the second bar 20.

[0036] Then, as shown in Figure 6(c), with the rear corner of the bottom plate 81 of the six-wheeled cart 80 in the removal direction abutting against the second bar 20, the six-wheeled cart 80 is allowed to slide along the side of the second bar 20, and then, when the fixed wheels 83 of the six-wheeled cart 80 are lined up with the guide 50, the front side of the six-wheeled cart 80 in the removal direction is swung further away from the second bar 20, and the six-wheeled cart 80 is removed from the cart transport auxiliary vehicle 1, as shown in Figure 6(d).

[0037] In addition, as shown in FIG. 6(b), the six-wheeled cart 80 may be detached from the cart transport auxiliary vehicle 1 while the front side of the bottom plate 81 of the six-wheeled cart 80 in the detachment direction is swung away from the second bar 20.

[0038] In this way, at the connection between the first bar 10 and the second bar 20, two guides 40 are provided, each having an abutment portion 41 parallel to the second bar 20 at a position spaced a distance D1 from the second bar 20 in the direction in which the first bar 10 extends, and two guides 50 are attached to the second bar 20 on the opposite side of the connection between the first bar 10 and the second bar 20 from the guide 40, at a predetermined interval from the guide 40, and spaced a distance L1 from the second bar 20. When holding two six-wheeled trolleys 80 in a state in which they can be transported in parallel, or when removing the six-wheeled trolley 80 from the held state, the corners of the bottom plate 81 can be swung toward the second bar 20 by a distance D1 between guides 40 and 50 in the holding area of ​​the six-wheeled trolley 80 surrounded by the abutment portions 41, 51, 61 of guides 40, 50, 60 and the first bar 10, as the six-wheeled trolley 80 changes direction, so that two six-wheeled trolleys 80 can be easily held in a state in which they can be transported in parallel, and the six-wheeled trolley 80 can be easily removed from the held state.

[0039] Furthermore, as described above, if the second guide 20 is attached in a position where the bottom plate 81 of the six-wheeled trolley 80 does not abut the guide 40 when the fixed wheel 83 of the six-wheeled trolley 80 is lined up with the guide 50 in the direction in which the first bar 10 extends, then with respect to approximately the central portion of the longitudinal direction of the bottom plate 81 which is less likely to shift in the short direction of the bottom plate 81 due to the fixed wheel 83 being attached, the corner portion of the bottom plate 81 can be swung toward the second bar 20 by a distance D1 between the guides 40 and 50 as the direction of the six-wheeled trolley 80 is changed, thereby making it even easier to hold the two six-wheeled trolleys 80 in a state in which they are transported in parallel and to remove the six-wheeled trolley 80 from this held state. In addition, since a second bar 20 is present between the two six-wheeled carts 80 being held, when the two six-wheeled carts 80 are held in a state for transporting in parallel, or when the six-wheeled carts 80 are removed from the held state, the goods or items loaded on the six-wheeled carts 80 arranged in parallel will not collide with each other.

[0040] Next, a method of connecting the six-wheeled cart 80 shown in FIG. 3 in series by connecting the cart transport auxiliary vehicles 1 shown in FIG. 1 and FIG. 2 will be described.

[0041] FIG. 7 is a diagram showing an embodiment of a connecting bar for connecting the cart transport auxiliary vehicle 1 shown in FIG. 1 and FIG. 2, where (a) is a top view and (b) is a side view.

[0042] As shown in Fig. 7, the connecting bar in this embodiment is composed of a T-shaped base, and a connecting groove 91 serving as a first engagement portion is provided in the horizontal bar portion of the T-shaped base, and a connecting hole 92 serving as a second engagement portion is provided at the end of the vertical bar portion of the T-shaped base opposite to the horizontal bar. As a result, the connecting bar 90 has a connecting groove 91 at one end and a connecting hole 92 at the other end. The connecting groove 91 is provided on one surface of the base, extending in the direction in which the horizontal bar portion of the T-shaped base extends. In addition, the length L3 from the connecting groove 91 to the connecting hole 92 is equal to or greater than the length of the short side of the bottom plate 81 of the six-wheeled dolly 80 shown in Fig. 3.

[0043] FIG. 8 is a diagram showing a state in which the cart transport auxiliary vehicles 1 shown in FIG. 1 and FIG. 2 are connected in series using the connecting bar 90 shown in FIG. 7, as viewed from the side.

[0044] When the cart transport auxiliary vehicle 1 shown in FIG. 1 and FIG. 2 is connected in series using the connecting bar 90 shown in FIG. 7, as shown in FIG. 8, the connecting pin 23 provided on the connecting pole 21 of the cart transport auxiliary vehicle 1 attached to the moving vehicle using the connecting device 30 is inserted into the connecting hole 92 of the connecting bar 90 to engage it, and the connecting groove 91 of the connecting bar 90 is hooked and engaged with the H-shaped horizontal bar of the connecting frame 11 provided on the first bar 10 of the cart transport auxiliary vehicle 1 connected to the cart transport auxiliary vehicle 1 attached to the moving vehicle using the connecting device 30. As a result, the two cart transport auxiliary vehicles 1 are connected in series via the connecting bar 90. At that time, as described above, the upper surface of the pin base 22 on which the connecting pin 23 is provided is at the same height as the H-shaped horizontal bar of the connecting frame 11, so that the connecting bar 90 is in a horizontal state.

[0045] In this way, by using a cart transport auxiliary vehicle unit consisting of a cart transport auxiliary vehicle 1 and a connecting bar 90 connected to it, the connecting pin 23 provided on the second bar 20 of one of the two cart transport auxiliary vehicles 1 is inserted into the connecting hole 92 of the connecting bar 90, and the connecting groove 91 of the connecting bar 90 is hooked onto the connecting frame 11 provided on the first bar 10 of the other cart transport auxiliary vehicle 1, thereby connecting multiple cart transport auxiliary vehicles 1 in series, and multiple sets of six-wheeled carts 80 arranged in parallel and held on the cart transport auxiliary vehicle 1 can be easily connected in series and transported.

[0046] Figure 9 is a diagram viewed from above to explain the effect of the length L3 from the connecting groove 91 to the connecting hole 92 of the connecting bar 90 shown in Figure 7 being greater than or equal to the length of the short side of the bottom plate 81 of the six-wheeled cart 80 shown in Figure 3.

[0047] Two cart transport auxiliary vehicles 1 connected by a connecting bar 90 are connected by inserting a coupling pin 23 provided on one of the cart transport auxiliary vehicles 1 into a coupling hole 92 of the connecting bar 90, so that the connecting bar 90 can rotate with respect to the second bar 20 of one of the cart transport auxiliary vehicles 1. Therefore, when the two cart transport auxiliary vehicles 1 turn in a connected state, the two cart transport auxiliary vehicles 1 connected by the connecting bar 90 are bent around the coupling pin 23 inserted into the coupling hole 92 of the connecting bar 90.

[0048] At this time, the length L3 from the connecting groove 91 to the connecting hole 92 of the connecting bar 90 is equal to or longer than the length of the short side of the bottom plate 81 of the six-wheeled cart 80 shown in Fig. 3, so that the angle between the six-wheeled carts 80 connected in series can be reduced to 90 degrees when turning to change direction, as shown in Fig. 9, and the turning radius can be prevented from becoming large. In particular, when the six-wheeled cart 80 is not held on the cart transport auxiliary vehicle 1 attached to the moving vehicle using the connecting device 30, and the six-wheeled cart 80 is held on the cart transport auxiliary vehicle 1 connected to the cart transport auxiliary vehicle 1 by the connecting bar 90, the weight applied to the cart transport auxiliary vehicle 1 attached to the moving vehicle using the connecting device 30 is small, so that there is a risk of a wheelie occurring in which the swivel wheel 72 attached to the first bar 10 rises significantly above the ground. However, by attaching a swivel wheel 73 to the underside of the second bar 20 near the end opposite the first bar 10, wheelies can be prevented.

[0049] Furthermore, if a cushioning material such as a sponge with a certain thickness is attached to the front surface of the first bar 10, even if an item loaded on the six-wheeled cart 80 protrudes from the bottom plate 81, as long as the amount of protrusion is less than the thickness of the cushioning material, it is possible to prevent the protruding item from colliding with the cart transport auxiliary vehicle 1 whose connecting groove 91 of the connecting bar 90 is hooked onto the connecting frame 11 when the angle between the six-wheeled carts 80 connected in series is reduced to 90 degrees.

[0050] Note that while the example shown in Figure 9 illustrates a state in which two cart transport auxiliary vehicles 1 are connected in series by one connecting bar 90, three or more cart transport auxiliary vehicles 1 can be connected in series by using two or more connecting bars 90.

[0051] In this embodiment, an example has been described in which a guide 40 is provided at the end of the second bar 20 that is connected to the first bar 10, but the guide 40 may be attached to either the first bar 10 or the second bar 20 as long as it has an abutment portion 41 at or near the connection between the first bar 10 and the second bar 20.

[0052] In addition, in this embodiment, the protector 12 is attached to the surface of the first bar 10 against which the six-wheeled carts 80 abut in parallel, and one short side of the bottom plate 81 of the six-wheeled cart 80 abuts against the first bar 10 via the protector 12, but the protector 12 may be attached as necessary. That is, in the present invention, one short side of the bottom plate 81 of the six-wheeled cart 80 abuts against the first bar 10 includes a case where one short side of the bottom plate 81 of the six-wheeled cart 80 abuts against the first bar 10 via the protector 12 and a case where one short side of the bottom plate 81 of the six-wheeled cart 80 abuts against the first bar 10 without the protector 12. [Explanation of symbols]

[0053] 1 Trolley transport auxiliary vehicle 10 First Bar 11 Connecting frame 12 Protector 20 Second Bar 21 Connecting pole 22 pin stand 23 Connecting pin 24 Support bar 30 Connection Equipment 40,50,60 Guide 41,51,61 Contact part 42,62 Slope 71,83 Fixed wheel 72,73,84 Free wheel 80 6-wheeled trolley 81 Bottom plate 82 Side frame 90 Connecting bar 91 Connection groove 92 Connection hole 100 Mobile Car

Claims

1. A cart transport auxiliary vehicle unit for transporting a plurality of sets of two carts arranged in parallel and having rectangular bottom plates connected in series, A cart transport auxiliary vehicle that holds the two carts in parallel; A connecting bar that connects a plurality of the cart transport auxiliary vehicles in series, The cart transport auxiliary vehicle is A first bar having a first connection receiving portion that abuts one of the short sides of the bottom plate when the two baskets are arranged side by side and engages with one end of the connection bar; a second bar extending from a central portion of the first bar in a direction perpendicular to the first bar by at least the length of the long side of the bottom plate, the second bar having a second connection receiving portion at an end opposite to the first bar and having wheels attached to an underside thereof; The first bar and the second bar hold the car along two adjacent sides of the bottom plate, A cart transport auxiliary vehicle unit, wherein the connecting bar has at one end a first engagement portion for engaging with the first connection receiving portion of one of the two cart transport auxiliary vehicles to be connected, and at the other end a second engagement portion for engaging with the second connection receiving portion of the other of the two cart transport auxiliary vehicles to be connected, and is configured to be rotatable horizontally relative to the second bar when the second engagement portion engages with the second connection receiving portion, and the length from the first engagement portion to the second engagement portion is greater than or equal to the length of the short side of the bottom plate.

2. 2. The cart transport auxiliary vehicle unit according to claim 1, A cart transport auxiliary vehicle unit, wherein the first bar has a cushioning material having a certain thickness attached to a surface opposite the second bar.

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