Handcart

Abstract

To provide a handcart that can be easily assembled in use and can be easily folded after the completion of conveyance of a cargo.SOLUTION: A handcart 1 used for conveying a cargo includes: a cargo frame 2; four pole parts 3 that has one end rotatably connected to the cargo frame 2; and a holding part 4 that engages with the pole parts 3 and holds the pole parts 3. When the pole parts 3 engage with the holding part 4, the pole parts 3 are held in a state of being upright with respect to the cargo frame 2. When the engagement with the holding part 4 is released, the pole parts 3 can be stacked on the cargo frame 2. A length of the holding part 4 is shorter than a length of the pole parts 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a foldable hand truck used when loading and transporting luggage on a truck or the like. [Background technology]

[0002] When loading luggage onto a truck for transport, a hand truck is used. Patent Document 1 describes a tire stacking transport device for transporting multiple stacked tires at the same time. However, the tire transport device described in the document cannot be folded and takes up a large amount of space even after transport is complete. Since hand trucks are stored on the truck bed after transporting cargo, it is preferable that they can be stored compactly. Therefore, Patent Document 2 proposes a tire transport cart that can be disassembled into a support base, a back frame, and side frames. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-125974 [Patent Document 2] Japanese Utility Model Application Publication No. 3-57102 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] However, the tire transport cart described in Patent Document 2 has a problem in that the support base, back frame, and side frames are detachably connected, making the assembly work before use and the disassembly work after use complicated. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a hand truck that can be easily assembled when in use and can be easily folded up after transporting luggage has been completed. [Means for solving the problem]

[0005] The present invention has the following configuration as a means for solving the above problems. A hand truck used for transporting cargo, comprising a loading platform frame, four pillars each rotatably connected at one end to the loading platform frame, and holding parts that engage with the pillars to hold the pillars, wherein the pillars are held upright relative to the loading platform frame by engaging with the holding parts, and can be stacked on the loading platform frame by disengaging from the holding parts, and the length of the holding parts is shorter than the length of the pillars. The trolley can be easily assembled by engaging the pillars with the holders, and can be easily folded by releasing the engagement after use. Furthermore, when the pillars are stacked on the bed frame after releasing the engagement between the pillars and the holders, the part of the holder that stands upright from the bed frame is shorter than the pillars, making the height compact when the trolley is no longer in use and can be stored.

[0006] A connecting portion may be provided to connect two of the four pillar portions that are rotatable in the same direction. The connecting part allows the two columns to be moved simultaneously, improving ease of handling when changing the engagement state between the columns and the holding part. In addition, the two columns connected by the connecting part are held by the two holding parts, which allows the force applied to the columns to be dispersed, improving the rigidity of the columns.

[0007] The holding portion may have a groove, and the pillar portion may be configured to fit into the groove when engaged with the holding portion. The cross section of the groove may be U-shaped, and the cross section of the pillar may be rectangular so as to fit into the groove. When the post engages with the holding portion, the post fits into the groove of the holding portion, allowing the holding portion to stably hold the post in a predetermined position.

[0008] A hand truck used for transporting cargo has a plurality of units each having the loading platform frame, the pillar portion, and the holding portion, and the plurality of units consists of a lowest base unit and a stacking unit that can be stacked directly or indirectly on the base unit, and the stacking unit has a stacking engagement portion on the side of the loading platform frame opposite the pillar portion, and the stacking engagement portion can engage with the end of the pillar portion when the pillar portion and the holding portion are engaged, and can engage with the end of the holding portion when the engagement between the pillar portion and the holding portion is released.

[0009] When the columns are upright on the bed frame, the stacking engagement parts can be engaged with the ends of the columns to stack multiple units, allowing for the transportation of large amounts of cargo.Furthermore, when the columns are stacked on the bed frame, the stacking engagement parts can be engaged with the ends of the holders to allow multiple units to be stacked and stored compactly.

[0010] Each of the stacking units may have four stacking engagement portions, one of which is a positioning engagement portion that is higher from the loading platform frame than the other three stacking engagement portions, and the unit may be configured such that, when the pillar portion and the stacking engagement portion are engaged, the positioning pillar portion that engages with the positioning engagement portion is lower in height than the other pillar portions by the amount that the positioning engagement portion is higher than the other stacking engagement portions, and when the engagement between the pillar portion and the stacking engagement portion is released, the positioning holding portion that engages with the positioning engagement portion is lower in height than the other holding portions by the amount that the positioning engagement portion is higher than the other stacking engagement portions.

[0011] By making one of the four stacking engagement parts a higher positioning engagement part than the other three, when the stacking unit is used alone, the positioning engagement part will touch the ground before the other three stacking engagement parts, causing tilting. This prevents the stacking unit from being used alone and encourages the base unit and stacking unit to be used and stored together as a unit.

[0012] There may be two stacking units, and the position of the positioning engagement portion in one stacking unit may be different from the position of the positioning engagement portion in the other stacking unit. When stacking units, they must be stacked in the correct order to keep the loading frame parallel. The tilt of the loading frame indicates that the units have been stacked in the wrong order, preventing them from being stacked in the wrong order.

[0013] The hand truck may be a hand truck for transporting tires. [Effects of the Invention]

[0014] After use, by releasing the engagement between the pillar and the holding part and stacking the pillar on the loading platform frame, the member standing upright from the loading platform frame becomes a holding part that is shorter than the pillar, making it possible to make the height size of the hand cart compact when storing it. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a hand truck according to a first embodiment. [Figure 2] FIG. 10 is a front view showing a state in which tires are loaded with the pillars engaged with the holding portions. [Figure 3] FIG. 10 is a front view showing the state in which the column portion is stacked on the bed frame after the engagement with the holding portion has been released. [Figure 4] FIG. 10 is a front view of a modified hand truck. [Figure 5A] FIG. 4 is a partial cross-sectional view taken along line AA in FIG. 3. [Figure 5B] 5B is a cross-sectional view showing a state in which the pillar portion is engaged with the holding portion in FIG. 5A. FIG. [Figure 6] 5C is a cross-sectional view taken along line AA in FIG. 5B, showing a state in which the column portion and the groove portion of the holding portion are fitted together. [Figure 7] 10A and 10B are explanatory diagrams illustrating an example of an engagement structure between a column portion and a holding portion. [Figure 8] 10A and 10B are explanatory views schematically illustrating another example of an engagement structure between a pillar portion and a holding portion. [Figure 9] FIG. 10 is a front view of the hand truck according to the second embodiment. [Figure 10] 10 is a front view showing the state in which the engagement between the pillar portion and the holding portion has been released and the pillar portion has been stacked on the bed frame. FIG. [Figure 11] FIG. 10 is a front view showing the middle stacking unit of the hand truck. [Figure 12] FIG. 10 is a front view of a modified hand truck. [Figure 13] 10 is a front view showing the state in which the engagement between the pillar portion and the holding portion has been released and the pillar portion has been stacked on the bed frame. FIG. [Figure 14] FIG. 10 is a front view showing the middle stacking unit of the hand truck. DETAILED DESCRIPTION OF THE INVENTION

[0016] The embodiments of the present invention will be described below with reference to the drawings. The same reference numerals are used to designate common components in each drawing, and their explanations will be omitted. The coordinates in each drawing are used to indicate the directions and positional relationships of the components in each drawing.

[0017] First Embodiment FIG. 1 is a perspective view of a hand truck 1 according to this embodiment. As shown in the figure, the hand truck 1 comprises a rectangular loading platform frame 2, pillars 3, and holders 4 that hold the pillars 3 in an upright position relative to the loading platform frame 2.

[0018] The loading platform frame 2 is the part on which luggage is placed, and is composed of a rectangular frame with a rectangular hollow section when viewed in the Z direction. A plate-like object may be placed on top of the loading platform frame 2 (Z2 side), or may be fitted into the rectangular hollow section. Four wheels 5 are provided on the Z1 side of the loading platform frame 2. The wheels 5 may be ordinary fixed casters. The wheels 5 may also be equipped with stoppers to stop them from rotating.

[0019] One end of each of the four pillars 3 on the Z-direction Z1 side is rotatably connected to the bed frame 2. For example, by pivotally supporting one end of the pillar 3 on the bed frame 2, the pillar 3 can be rotatably connected to the bed frame 2.

[0020] 2 is a front view showing a state in which tires 50 are loaded on the loading frame 2 with the four pillars 3 engaged with the respective holding parts 4. This figure shows a state in which the hand truck 1 is used for transporting tires.

[0021] When viewed in the Z direction, the bed frame 2 is configured as a rectangular frame with its longer sides in the X direction. Therefore, when transporting a tire 50, the tire 50 is sandwiched between the two longer sides of the bed frame 2 and aligned in the X direction so that the rotation axis is parallel to the X direction.

[0022] Furthermore, when the tire 50 is being transported, each of the four pillars 3 is engaged with the holding portion 4 and is held upright relative to the bed frame 2. The pillars 3 being upright relative to the bed frame 2 means that the longitudinal direction of the pillars 3 is approximately perpendicular (Z direction) to the plane (XY plane) formed by the rectangle of the bed frame 2 when viewed from the Z direction.

[0023] When each of the four pillars 3 is engaged with the holding portion 4, the pillars 3 standing upright relative to the bed frame 2 surround the tire 50. Therefore, the pillars 3 can be used to secure the tire 50 with a fixture such as a fixing band. For example, the tire 50 can be secured to the hand truck 1 by fastening a band for securing the tire 50 to the pillars 3.

[0024] 3 is a front view showing a state in which the pillars 3 are not engaged with the holding parts 4. As shown in the figure, by releasing the engagement between the pillars 3 and the holding parts 4, the Z2 end of each pillar 3 can be rotated around the Z1 end, allowing it to be stacked on the bed frame 2.

[0025] The holding portion 4 is shorter than the pillar portion 3. Therefore, by releasing the engagement between the pillar portion 3 and the holding portion 4 and stacking the pillar portion 3 on the platform frame 2, the height of the hand truck 1 in the Z direction becomes smaller. In other words, by releasing the engagement between the pillar portion 3 and the holding portion 4, the height of the platform frame 2 of the hand truck 1 in the upward direction (Z2 direction) becomes from the height H3 of the pillar portion 3 (see Figure 2) to the height H4 of the holding portion 4. Therefore, the height of the hand truck 1 can be made compact when transportation of tires 50 and the like has finished and there is no cargo on the platform frame 2.

[0026] Figure 4 is a front view showing a modified example of the handcart 1. As shown in the figure, the pillars 3 of the handcart 1 may be configured so that they partially overlap when stacked on the platform frame 2. With this configuration, the height of the handcart 1 increases when the pillars 3 and the holders 4 are engaged, making the handcart 1 suitable for transporting tall loads.

[0027] FIG. 5A is a partial cross-sectional view taken along line AA in FIG. 3, showing the state in which the column portion 3 is not engaged with the holding portion 4. FIG. FIG. 5B is a partial cross-sectional view showing the state in which the post portion 3 is engaged with the holding portion 4 in FIG. 5A. As shown in these figures, the hand cart 1 has a connecting part 6 that connects two of the four pillar parts 3 that can rotate in the same direction. Here, being able to rotate in the same direction means that the ends on the Z2 side can rotate in the same direction when the pillar parts 3 and the holding part 4 are disengaged.

[0028] 1, when the hand cart 1 is disengaged from the holding part 4, the pillars 3a and 3b become rotatable in the X2 direction, and the pillars 3c and 3d become rotatable in the X1 direction. Therefore, the pillars 3a and 3b are connected by the connecting part 6ab, and the pillars 3c and 3d are connected by the connecting part 6cd.

[0029] By providing the connecting portion 6 that connects the pillar portions 3, the two pillar portions 3 can be moved simultaneously. This improves the ease of handling the pillar portions 3 when engaging or disengaging the pillar portions 3 from the holding portions 4. Furthermore, when the pillar portions 3 and the holding portions 4 are engaged, the pillar portions 3 connected by the connecting portion 6 support each other. Therefore, the rigidity of the pillar portions 3 is improved by the connected pillar portions 3 being held by the two holding portions 4.

[0030] As shown in Fig. 5A, the holding portion 4 has a groove portion 40. Then, as shown in Fig. 5B, when the pillar portion 3 and the holding portion 4 are engaged, the pillar portion 3 fits into the groove portion 40 of the holding portion 4. By fitting the pillar portion 3 into the groove portion 40 of the holding portion 4, the holding portion 4 can stably hold the pillar portion 3 in a predetermined position.

[0031] 6 is a cross-sectional view taken along line AA in FIG. 5B. As shown in the figure, when viewed in the Z direction, the groove 40 is U-shaped, and the outer side of the rectangular column 3 corresponds to the groove 40, i.e., the shape follows the inner surface of the U-shape of the groove 40. With this configuration, when the column 3 is engaged with the retainer 4, the column 3 and the groove 40 fit together, and the outer surface of the column 3 and the inner surface of the groove 40 come into surface contact. This allows the retainer 4 to stably hold the column 3 in a predetermined position. Furthermore, when the engagement between the column 3 and the retainer 4 is released, the column 3 can rotate toward the X2 side, where the groove 40 in the retainer 4 is open.

[0032] 5 indicates the cross section of the pillar portion 3a, the cross section of the groove portion 40 of the holding portion 4 is open on the X2 side. Like the pillar portion 3a, the cross section of the groove portion 40 of the pillar portion 3b is open on the X2 side, and the cross sections of the groove portion 40 of the holding portion 4 of the pillar portions 3c and 3d are open on the X1 side.

[0033] 7 is an explanatory diagram showing a schematic example of an engagement structure between the pillar 3 and the holding portion 4. In the figure, (a) on the far left shows a state in which the engagement portion 31 of the pillar 3 and the engagement portion 41 of the holding portion 4 are engaged, and the pillar 3 is held upright relative to the bed frame 2. (b) second from the left shows a state in which the engagement portion 31 of the pillar 3 and the engagement portion 41 of the holding portion 4 are disengaged. (c) third from the left shows a state in which the engagement portion 31 and the engagement portion 41 are disengaged and the pillar 3 is rotated to the X2 side. (d) on the far right shows a state in which the pillar 3 is rotated to the X2 side and stacked on the bed frame 2 (see FIG. 3).

[0034] As shown in the same figure, the pillar portion 3 is connected to the loading platform frame 2 at one end on the Z1 side via the holding portion 4 by inserting its axial hole 32 into a support shaft 42 provided in the holding portion 4, so that the pillar portion 3 is in a rotatable state.

[0035] 7, the position of the support shaft 42 in the shaft hole 32 formed long in the Z direction is configured to be movable. Therefore, the pillar portion 3 can be pulled out in the Z2 direction while standing upright on the bed frame 2. By pulling out the pillar portion 3 in the Z2 direction, the engagement between the engagement portion 31 fixed to the pillar portion 3 and the engagement portion 41 of the holding portion 4 can be released.

[0036] Furthermore, when engaging the engaging portion 31 of the pillar 3 with the engaging portion 41 of the holding portion 4, the pillar 3 is rotated while pulled out in the Z2 direction, and then pushed in the Z1 direction to a position where the pillar 3 is upright relative to the bed frame 2. This engages the engaging portion 31 of the pillar 3 with the engaging portion 41 of the holding portion 4, and the pillar 3 is locked to the bed frame 2 by being engaged with the holding portion 4.

[0037] Figure 8 is an explanatory diagram that schematically shows another example of the engagement structure between the pillar portion 3 and the holding portion 4. In the example shown in the figure, the XZ cross section of the shaft hole 32 and the support shaft 42 is circular. Therefore, the position of the support shaft 42 in the shaft hole 32 is fixed, and when the pillar portion 3 is upright with respect to the bed frame 2, the pillar portion 3 cannot be pulled out in the Z2 direction. Therefore, the engagement portion 31 of the pillar portion 3 is configured to be movable within a predetermined range in the Z direction.

[0038] As shown in (a) of Figure 8, by moving the engaging portion 31 in the Z2 direction, the engaging portion 31 of the pillar 3 and the engaging portion 41 of the holding portion 4 are disengaged. In the disengaged state, the pillar 3 can be rotated in the X2 direction as shown in (b) and (c). Then, by rotating the pillar 3 in the X2 direction, the pillar 3 can be stacked on the bed frame 2 as shown in (d) (see Figure 3).

[0039] 8, the engagement between the engagement portion 31 and the engagement portion 41 of the holding portion 4 is released by moving the position of the engagement portion 31 of the pillar portion 3. Similarly, when engaging the engagement portion 31 with the engagement portion 41 of the holding portion 4, the pillar portion 3 is rotated to be upright with respect to the loading platform frame 2, and the engagement portion 31 of the pillar portion 3 is moved to engage with the engagement portion 41 of the holding portion 4.

[0040] Note that the engagement structure between the column portion 3 and the holding portion 4 may be configured in a manner other than that described above. For example, it may be configured using a rotating shaft and a stopper pin (including a ball plunger), or a hinge and a stopper.

[0041] As described above, the hand truck of this embodiment can be made compact in height by releasing the engagement between the pillar portion and the holding portion and stacking the pillar portion on the loading platform frame, so that it occupies less space after the cargo has been transported and is easy to handle.

[0042] <Second embodiment> In this embodiment, an embodiment of the present invention will be described in which the hand truck 10 has a plurality of units 10A to 10C, each of which has a platform frame 2, four pillars 3, and four holders 4. In the following, an embodiment having three units 10A to 10C will be described, but the number of units is not limited to three, and may be two or four or more.

[0043] The middle unit (stacked unit) 10B can be stacked on the bottom unit (base unit) 10A. Also, the upper unit (stacked unit) 10C can be stacked on the middle unit 10B. It can be said that the upper unit 10C can be indirectly stacked on the unit (base unit) 10A via the middle unit 10B.

[0044] Units 10B and 10C are provided with stacking engagement portions 7 on the opposite side (Z1 side) of the pillars 3 and holding portions 4 of the bed frame 2. Note that although Fig. 9 is a front view seen from the Y1 side, pillars 3b and 3d and holding portions 4b and 4d are also provided on the Y2 side (see Fig. 1). Furthermore, similar to stacking engagement portions 7a and 7c provided on the Z1 side of holding portions 4a and 4c, stacking engagement portions 7b and 7d are also provided on the Z1 side of holding portions 4b and 4d.

[0045] The stacking engagement portion 7 is configured to be able to engage with the end portion 33 of the pillar portion 3 when the pillar portion 3 and the holding portion 4 are engaged. When the pillar portion 3 is upright relative to the loading platform frame 2, the stacking engagement portion 7 can be engaged with the end portion 33 of the pillar portion 3, and units 10B and 10C can be stacked on unit 10A for use, allowing many loads to be transported at the same time.

[0046] FIG. 10 is a front view showing the state in which the column 3 is not engaged with the holding portion 4 and no cargo is loaded. When the column 3 and holding portion 4 of the hand cart 10 are disengaged, the stacking engagement portion 7 can engage with the engagement portion (end) 41 of the holding portion 4. Therefore, as shown in FIG. 10, even after use, just as during use, the stacking engagement portion 7 can engage with the engagement portion 41 of the holding portion 4, allowing units 10B and 10C to be stacked on unit 10A for compact storage. The engagement portion 41 is formed at the end of the holding portion 4 on the Z2 side.

[0047] 11 is a front view showing the middle unit 10B of the hand truck 10 with the column 3 engaged with the holder 4. As shown in the figure, the stacking engagement parts 7a, 7b, 7c, and 7d of unit 10B have the same height H in the Z2 direction from the platform frame 2. Therefore, when placed on flat ground G, the stacking engagement parts 7a, 7b, 7c, and 7d land simultaneously, and the platform frame 2 becomes parallel to the ground G.

[0048] In this way, since unit 10B can be used and stored stably on its own, there is a risk that it will be used and stored alone without being stacked on unit 10A. The same applies to unit 10C. Using or storing it alone can cause parts of units 10A to 10C to be lost. Furthermore, if units 10A to 10C are designed to be used in a stacked state, using them alone can cause them to be damaged. Therefore, it is not desirable to use or store units 10A to 10C alone.

[0049] FIG. 12 is a front view of a modified example of the hand cart 10, showing the state in which the pillar portion 3 and the holding portion 4 are engaged with each other. FIG. 13 is a front view of a modified example of the hand cart 10, showing the state in which the column 3 and the holding part 4 are not engaged with each other.

[0050] In the modified example shown in these figures, one of the four stacking engagement portions 7 on units 10B and 10C is made higher from the loading platform frame 2 than the other three stacking engagement portions 7 to prevent units 10B and 10C from being used or stored alone without being stacked on unit 10A.

[0051] 12, of the four stacking engagement portions 7 of the middle unit 10B, the height H7a of stacking engagement portion 7c from the platform frame 2 is higher than the heights H7b, H7c, H7d of the other stacking engagement portions 7b, 7c, 7d from the platform frame 2, and it functions as a positioning engagement portion. Note that the heights H7b, H7c, H7d of the stacking engagement portions 7b, 7c, 7d other than stacking engagement portion (positioning engagement portion) 7a are the same.

[0052] The column 3a of unit 10A, which is located at a position corresponding to the stacking engagement portion 7a of unit 10B, i.e., when the column 3 is engaged with the holder 4, the column 3a of unit 10A that engages with the stacking engagement portion 7a of unit 10B functions as a positioning column. The height H3a of column (positioning column) 3a from the loading platform frame 2 is lower than the heights H3b, H3c, and H3d of the other columns 3b, 3c, and 3d from the loading platform frame 2. This height difference is equal to the difference between the height H7a of the stacking engagement portion 7a and the heights H7b, H7c, and H7d of the other stacking engagement portions 7b, 7c, and 7d.

[0053] That is, the sum of height H3a of unit 10A and height H7a of unit 10B is equal to the sum of height H3b of unit 10A and height H7b of unit 10B, the sum of height H3c of unit 10A and height H7c of unit 10B, and the sum of height H3d of unit 10A and height H7d of unit 10B. Therefore, as shown in Figure 12, when unit 10B is stacked on unit 10A with the pillar portions 3 engaged with the holding portions 4, the loading platform frame 2 of unit 10B becomes parallel to the loading platform frame 2 of unit 10A.

[0054] Furthermore, the holding portion 4a of unit 10A, which is located at a position corresponding to the stacking engagement portion 7a of unit 10A, i.e., the holding portion 4a of unit 10A that engages with the stacking engagement portion 7a of unit 10B when the column portion 3 is not engaged with the holding portion 4, functions as a positioning holding portion. The height H4a of the holding portion (positioning holding portion) 4a from the platform frame 2 is lower than the heights H4b, H4c, and H4d of the other holding portions 4b, 4c, and 4d from the platform frame 2. This height difference is equal to the difference between the height H7a of the stacking engagement portion 7a and the heights H7b, H7c, and H7d of the other stacking engagement portions.

[0055] That is, the sum of height H4a of unit 10A and height H7a of unit 10B is equal to the sum of height H4b of unit 10A and height H7b of unit 10B, the sum of height H4c of unit 10A and height H7c of unit 10B, and the sum of height H4d of unit 10A and height H7d of unit 10B. Therefore, as shown in Figure 13, when unit 10B is stacked on unit 10A with the pillars 3 not engaged with the holders 4, the bed frame 2 of unit 10B becomes parallel to the bed frame 2 of unit 10C.

[0056] Furthermore, the relationship between the column 3, the holding portion 4, and the stacking engagement portion 7 in the upper unit 10C and the middle unit 10B is the same as the relationship between the column 3, the holding portion 4, and the stacking engagement portion 7 in the middle unit 10B and the lower unit 10A described above. However, the upper unit 10C differs from the middle unit 10B in that the stacking engagement portion 7c functions as a positioning engagement portion. The middle unit 10B also differs from the lower unit 10A in that the column 3c functions as a positioning column and the holding portion 4c functions as a positioning retention portion.

[0057] The sum of height H3c of unit 10B and height H7c of unit 10C is equal to the sum of height H3a of unit 10B and height H7a of unit 10C, the sum of height H3b of unit 10B and height H7b of unit 10C, and the sum of height H3d of unit 10B and height H7d of unit 10C. Therefore, as shown in Figure 12, when unit 10C is stacked on unit 10B with the pillar portions 3 engaged with the holding portions 4, the loading platform frame 2 of unit 10C becomes parallel to the loading platform frame 2 of unit 10B.

[0058] Furthermore, the sum of height H4c of unit 10B and height H7c of unit 10C is equal to the sum of height H4a of unit 10B and height H7a of unit 10C, the sum of height H4b of unit 10B and height H7b of unit 10C, and the sum of height H4d of unit 10B and height H7d of unit 10C. Therefore, as shown in Figure 13, when unit 10C is stacked on unit 10B with the pillars 3 not engaged with the holders 4, the bed frame 2 of unit 10C becomes parallel to the bed frame 2 of unit 10B.

[0059] Fig. 14 is a front view showing the middle unit 10B of the hand truck 10. As shown in the figure, in unit 10B, the height H7a of the stacking engagement portion 7a from the platform frame 2 is higher than the heights H7b, H7c, and H7d of the other stacking engagement portions 7b, 7c, and 7d from the platform frame 2 (see Fig. 12). Therefore, if unit 10B is used alone, the platform frame 2 will tilt. This prevents unit 10B from being used alone.

[0060] In unit 10C, the height H7c of the stacking engagement portion 7c from the loading frame 2 is higher than the heights H7a, H7b, H7d of the other stacking engagement portions 7a, 7b, 7d from the loading frame 2. Therefore, like unit 10B, it is possible to prevent unit 10C from being used alone.

[0061] Furthermore, stacking engagement portion 7a is used as the positioning engagement portion in unit 10B, while stacking engagement portion 7c is used as the positioning engagement portion in unit 10C. In this way, by using stacking engagement portions 7 in different positions in different units as positioning engagement portions, if the units are stacked in the wrong order, the loading platform frame 2 of the stacked unit will not be parallel to the loading platform frame 2 of the unit below. Therefore, it is clear that the units have been stacked in the wrong order. When units 10B and 10C are stacked and viewed in the Z direction, stacking engagement portions 7 that are in positions that do not overlap are called stacking engagement portions 7 in different positions in the units.

[0062] For example, when unit 10C is stacked on unit 10A, the loading frame 2 of unit 10C will tilt relative to the loading frame 2 of unit 10A. This makes it possible to prevent units from being stacked in the wrong order.

[0063] In the modified example shown in FIGS. 11 to 14, one of the stacking engagement portions 7 is made higher than the other three stacking engagement portions 7, but two or three stacking engagement portions 7 may be made higher. [Industrial Applicability]

[0064] The present invention is useful as a hand truck used when transporting cargo such as tires by truck. [Explanation of symbols]

[0065] 1: Hand truck 2: Cargo frame 3, 3a, 3b, 3c, 3d: Pillar part 4, 4a, 4b, 4c, 4d: Holding part 5: Wheels 6, 6ab, 6cd: Connection part 7, 7a, 7b, 7c, 7d: Stacking engagement part 10: Hand truck 10A: Unit (base unit) 10B, 10C: Unit (Stacked Unit) 31: Joint 32: shaft hole 33: end 40: Groove 41: Joint 42: Support shaft 50 :タイヤ G : Ground H, H3, H3a, H3b, H3c, H3d, H4, H4a, H4b, H4c, H4d, H7a, H7b, H7c, H7d: Highさ

Claims

1. A hand truck used to transport luggage, The cargo frame and Four pillars, one end of which is rotatably connected to the bed frame; a retaining portion that engages with the post portion to retain the post portion; The column portion is By engaging with the holding portion, the vehicle is held upright relative to the cargo bed frame, By releasing the engagement with the holding portion, the bag can be stacked on the loading platform frame. A hand truck characterized in that the length of the holding portion is shorter than the length of the pillar portion.

2. The hand truck according to claim 1, further comprising a connecting portion that connects two of the four pillars that are rotatable in the same direction.

3. the retaining portion includes a groove; The hand truck according to claim 1 , wherein the pillars are fitted into the grooves when engaged with the holders.

4. The cross section of the groove is U-shaped, 4. The hand truck according to claim 3, wherein the cross section of the pillar portion is rectangular so as to fit into the groove portion.

5. A hand truck used to transport luggage, a plurality of units each including the bed frame, the pillar portion, and the holding portion; The plurality of units include a lowest base unit and a stacking unit that can be stacked directly or indirectly on the base unit; The stacking unit includes a stacking engagement portion on the opposite side of the platform frame from the pillar portion, The stacking engagement portion is When the column portion and the holding portion are engaged with each other, the holding portion is engageable with an end of the column portion, The hand truck according to claim 1, wherein the column portion is engageable with an end of the holding portion when the engagement between the column portion and the holding portion is released.

6. Each of the stacking units has four of the stacking engagement portions, One of the four stacking engagement portions is a positioning engagement portion that is higher in height from the bed frame than the other three stacking engagement portions, The unit comprises: a positioning post portion that engages with the positioning engagement portion when the post portion and the stacking engagement portion are engaged with each other is lower in height than the other post portions by an amount corresponding to the positioning engagement portion being higher in height than the other stacking engagement portions; 6. A hand truck as described in claim 5, wherein the positioning holding portion that engages with the positioning engaging portion when the engagement between the column portion and the stacking engaging portion is released is lower in height than the other holding portions by the same amount that the positioning engaging portion is higher than the other stacking engaging portions.

7. The stacking unit is two, the position of the positioning engagement portion in one of the stacking units; The hand truck according to claim 6, wherein the positioning engagement portion of the stacking unit is in a different position from that of the other stacking unit.

8. 2. The hand truck according to claim 1, which is used for transporting tires.

Images