Dolly

Abstract

To provide a carriage such that in the state that carriages are vertically stacked, an upper carriage is less likely to strike slip with respect to a lower carriage.SOLUTION: A carriage 1 comprises a base part 2 for placing loads thereon, and a caster part 3. The base part 2 is configured from a plurality of side components 4 having a beam part 42 which extends in a lateral direction and of which a top face becomes a side support face 41, and a plurality of corner members 5 connected to the plurality of side components 4. The caster part 3 is attached to an undersurface of each corner member 5. The corner member 5 has a lateral piece 51 of which a top face becomes a corner support face 56, and a vertical piece 52 which extends upward from an end edge outside the lateral piece 51. The vertical piece 52 regulates outward movement of loads. The lateral piece 51 has a recess 54 for storing a wheel part 31 of the caster part 3, and a projection 544 for regulating movement of the wheel part 31. The projection 544 is formed at a central part of the recess 54.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cart.

Background Art

[0002] Conventionally, a cart including a plurality of side members, a corner member connecting the plurality of side members, and a rotatable caster portion attached to the lower surface of the corner member is known (see, for example, Patent Document ①). The side members extend in the horizontal direction, and the upper surface serves as a placement surface for the loaded goods. Also, the upper surface of the corner member serves as a placement surface for the loaded goods.

[0003] By the way, in the cart shown in Patent Document ①, when storing a plurality of carts, the carts were stacked and stored in the same orientation. However, in the cart shown in Patent Document ①, when the carts are stacked, the wheels of the caster portion of the upper cart rotate freely, making it easy for the upper cart to move horizontally and causing the upper cart to be prone to lateral displacement relative to the lower cart.

Prior Art Documents

Patent Documents

[0004]

Patent Document ①

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been invented in view of the above conventional problems, and an object thereof is to provide a cart in which the upper cart is less likely to be laterally displaced relative to the lower cart when the carts are stacked vertically.

Means for Solving the Problems

[0006] To solve the above problems, one embodiment of the trolley according to the present invention comprises a base for placing a load and a caster section. The base is composed of a plurality of side members having beam sections that extend laterally and whose upper surface is a side support surface, and a plurality of corner members connected to the plurality of side members. The caster section is attached to the lower surface of each corner member. The corner member has a horizontal piece whose upper surface is a corner support surface, and a vertical piece that extends upward from the outer edge of the horizontal piece. The vertical piece restricts the outward movement of the load. The horizontal piece has a recess for housing the wheel section of the caster section and a protrusion that restricts the movement of the wheel section. The protrusion is formed in the center of the recess. [Effects of the Invention]

[0007] In the trolley according to the present invention, when the trolleys are stacked vertically, the upper trolley is less likely to slide laterally relative to the lower trolley. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of a trolley according to one embodiment, seen from diagonally above. [Figure 2] Figure 2 is an exploded perspective view of the same trolley, seen from diagonally above. [Figure 3] Figure 3 is a plan view of the same trolley. [Figure 4] Figure 4 is a side cross-sectional view of the same bogie. [Figure 5] Figure 5 is a side cross-sectional view showing the same trolleys stacked on top of each other. [Figure 6] Figure 6 is a schematic plan view showing the relationship between the recess and the caster section of the trolley shown above. [Figure 7] Figure 7 is a side cross-sectional view showing a modified example of the corner member of the same trolley. [Modes for carrying out the invention]

[0009] This invention relates to a trolley. The trolley according to the present invention will be described below based on the embodiments shown in the accompanying drawings.

[0010] A trolley according to one embodiment will be described with reference to Figures 1-5. As shown in Figures 1 and 2, the trolley 1 comprises a base portion 2 and a caster portion 3. Loads are placed on the upper surface of the base portion 2. As shown in Figure 3, the base portion 2 is rectangular in plan view, with each side approximately 30 cm to 100 cm long. A through portion 20 is formed in the center of the base portion 2 in plan view, passing through vertically. Hereafter, the trolley 1 will be described with respect to the side on which the loads are placed being considered the upper side, and the opposite side being considered the lower side. Also, the trolley 1 will be described with respect to the direction along the long side of the base portion 2 being considered the long side direction, and the direction along the short side of the base portion 2 being considered the short side direction. In this embodiment, the shape of the trolley 1 in plan view is symmetrical with respect to a line along the long side direction passing through the center of the short side direction. Also, the shape of the trolley 1 in plan view is symmetrical with respect to a line along the short side direction passing through the center of the long side direction.

[0011] The caster section 3 is attached to the lower surface of the corner member 5. As shown in Figure 4, the caster section 3 has a wheel section 31 and a support section 32 that suspends and supports the wheel section 31. The wheel section 31 has a wheel axle 311 and a tire 312. The tire 312 is preferably made of rubber, but is not particularly limited. The support section 32 has an upper piece 321 and a pivot shaft 323.

[0012] The upper piece 321 is rectangular in shape. The upper piece 321 is fixed to the lower surface of the corner member 5. The upper end of the pivot shaft 323 is connected to the upper piece 321. The pivot shaft 323 pivots around an axis that is approximately vertical to the upper piece 321. A pair of connecting pieces 322 extend downward from both ends of the pivot shaft 323. A wheel axle 311 is connected between the lower ends of the pair of connecting pieces 322, spanning approximately horizontally. This allows the wheel portion 31 connected to the connecting pieces 322 to pivot. The wheel axle 311 supports the wheel portion 31 so that it can rotate freely. The caster portion 3 has a structure in which the direction of the wheel portion 31 pivots around the axis of the pivot shaft 323, and the wheel portion 31 rotates around the axis of the wheel axle 311.

[0013] As shown in Figure 4, the center of the wheel portion 31 of the caster portion 3 is located on the central axis CL2, which is eccentric with respect to the central axis CL1 of the pivot axis 323. The central axis CL3 of the protruding portion 544 is located on the central axis CL1 of the pivot axis 323 of the caster portion 3. Also, the bottom surface 542 of the recess 54, which will be described later, is located on the central axis CL2 of the wheel axis 311 of the caster portion 3. Such a caster portion 3 is conventionally known, and various known casters can be used as appropriate.

[0014] The base portion 2 has a plurality of edge members 4 and a plurality of corner members 5 that connect the plurality of edge members 4. In this embodiment, since the base portion 2 has a rectangular frame shape in plan view, the base portion 2 has four edge members 4 and four corner members 5.

[0015] The edge member 4 has a beam portion 42 that extends in the lateral direction (horizontal direction when the trolley 1 is placed on a horizontal surface) and whose upper surface becomes an edge support surface 41 that supports the loaded material. In this embodiment, the base portion 2 has two long edge members 43 along the long side and two short edge members 44 along the short side as the edge member 4.

[0016] The two long-side members 43 are identical except that they are inverted from each other with respect to a line running along the long-side direction that passes through the center of the short-side direction. The long-side members 43 have an angle member 430. The angle member 430 has a vertical piece 431 and a horizontal piece 432 that forms the beam portion 42, and is made of metal. The upper surface of the horizontal piece 432 becomes the side support surface 41 that supports the load.

[0017] The vertical piece 431 extends upward from the outer edge of the horizontal piece 432 (the outer end side of the base portion 2 in a plan view). The vertical piece 431 functions as a restricting part (in other words, a fall prevention part) that restricts the outward movement of the load placed on the upper surface of the horizontal piece 432 so that the load does not move outward and fall off the horizontal piece 432. Furthermore, the integral formation of such a vertical piece 431 improves the bending rigidity of the horizontal piece 432 on which the load is placed and the entire trolley 1, making the horizontal piece 432 (truck 1) less prone to bending, and improving the impact resistance of the trolley 1.

[0018] The two short-side members 44 are identical except for the point that they are inverted with respect to each other about a line along the short-side direction passing through the center in the long-side direction. Similar to the long-side member 43, the short-side member 44 has an angle member 440. The angle member 440 has a vertical piece 441 and a horizontal piece 442 that serves as a beam portion 42, and is formed of metal. The upper surface of the horizontal piece 442 serves as a side support surface 41 for supporting the load.

[0019] The vertical piece 441 extends upward from the edge of the outer side of the horizontal piece 442 (the outer end side of the base portion 2 in plan view). The vertical piece 441 functions as a regulating portion (or, in other words, a fall-preventing portion) that regulates the outward movement of the load so that the load placed on the upper surface of the horizontal piece 442 does not move outward and fall off the horizontal piece 442. Further, by integrally forming such a vertical piece 441, the bending rigidity of the horizontal piece 442 on which the load is placed and the entire carriage 1 is improved, making the horizontal piece 442 (carriage 1) less likely to bend, and also improving the strength of the carriage 1 against impact.

[0020] The corner member 5 connects the short-side member 44 and the long-side member 43. The corner member 5 is arranged at the four corners of the base portion 2 in plan view.

[0021] The corner members 5 are identical except for the points that they are inverted with respect to each other about a line along the long-side direction passing through the center in the short-side direction. Also, the corner members 5 are identical except for the points that they are inverted with respect to each other about a line along the short-side direction passing through the center in the long-side direction. The corner member 5 has a horizontal piece 51 and a vertical piece 52, and is formed of resin.

[0022] As shown in FIGS. 1 - 3, the horizontal piece 51 has a notch 53 and a recess 54. The horizontal piece 51 of the corner member 5 is triangular in plan view. The upper surface of the horizontal piece 51 serves as a corner support surface 56 for supporting the load. In this embodiment, the corner support surface 56 (upper surface) of the horizontal piece 51 directly supports the load.

[0023] The vertical piece 52 of the corner member 5 extends upward from the outer edge (outer end side of the base portion 2 in a plan view) of the horizontal piece 51 of the corner member 5. The vertical piece 52 functions as a restricting part (in other words, a fall prevention part) that restricts the outward movement of the load placed on the upper surface of the horizontal piece 51 so that the load does not move outward and fall off the horizontal piece 51. Furthermore, by forming such a vertical piece 52 integrally, the bending rigidity of the horizontal piece 51 on which the load is placed and the entire trolley 1 is improved, making the horizontal piece 51 (trolley 1) less prone to bending, and improving the impact resistance of the trolley 1. In this embodiment, the restricting part (inner surface) of the vertical piece 52 directly restricts the outward movement of the load.

[0024] A groove 55 opening downwards is formed in the vertical piece 52. Specifically, a groove 55 opening downwards is formed in the portion of the vertical piece 52 that is aligned with the long side of the base portion 2, and the vertical piece 431 of the long side member 43 is inserted into this groove 55. In addition, a groove 55 opening downwards is formed in the portion of the vertical piece 52 that is aligned with the short side of the base portion 2, and the vertical piece 441 of the short side member 44 is inserted into this groove 55.

[0025] A notch 53 is formed on the lower surface of the horizontal piece 51 into which the end of the beam portion 42 of the side member 4 is inserted. Specifically, on the lower surface of the horizontal piece 51, a notch 53 is formed in the portion along the groove 55 into which the vertical piece 431 of the long side member 43 is inserted into which the horizontal piece 432 of the long side member 43 is inserted. Also, on the lower surface of the horizontal piece 51, a notch 53 is formed in the portion along the groove 55 into which the vertical piece 441 of the short side member 44 is inserted into which the horizontal piece 442 of the short side member 44 is inserted.

[0026] With the vertical pieces 431 and 441 of the edge member 4 inserted into the grooves 55 of the vertical piece 52, and the horizontal pieces 432 and 442 of the edge member 4 inserted into the notches 53 of the horizontal piece 51 of the corner member 5, the corner member 5 and the edge member 4 are fixed together by driving rivets (not shown) or the like into the edge member 4 via the corner member 5. This completes the base portion 2.

[0027] As shown in Figure 4, a recess 54 is formed in the corner support surface 56 of the horizontal piece 51. The recess 54 is formed in a part of the corner support surface 56. The recess 54 is a portion recessed from the corner support surface 56. In this embodiment, the recess 54 is circular in plan view. The recess 54 has an inclined surface 541, a bottom surface 542, a through hole 543, and a protruding portion 544. The recess 54 functions as a storage section (wheel storage section) for housing the wheel section 31 which is placed on the upper surface of the horizontal piece 51.

[0028] The inclined surface 541 of the recess 54 is a surface that slopes from the inner periphery of the corner support surface 56 toward the center of the recess 54. The inclined surface 541 is a concave curved surface.

[0029] The bottom surface 542 of the recess 54 is a plane that is horizontally continuous from the lower end of the inclined surface 541. The bottom surface 542 is annular in plan view. The wheel portion 31 housed in the recess 54 is placed on the bottom surface 542.

[0030] As described above, the wheel axle 311 of the caster section 3 is located below the base surface 542. As shown in Figure 6, the wheel section 31, which rotates around the axis of the pivot shaft 323, rotates along the arc-shaped trajectory of the base surface 542. This allows the wheel section 31 to be stored in the recess 54. The vertical length L1 from the bottom surface 542 to the corner support surface 56 (the vertical length of the recess 54) is shorter than the vertical length L2 from the corner support surface 56 to the upper end of the vertical piece 52 (the vertical length of the vertical piece 52). The bottom surface 542 is provided with a through hole 543 and a protrusion 544.

[0031] The through-hole 543 of the recess 54 is formed in a portion of the bottom surface 542 other than the protruding portion 544. The through-hole 543 is formed to penetrate the bottom surface 542 vertically. The through-hole 543 is provided, for example, to drain water, sand, etc. that has accumulated in the recess 54.

[0032] The projection 544 of the recess 54 is located in the center of the bottom surface 542. The projection 544 extends upward from the bottom surface 542. In this embodiment, the projection 544 is frustoconical in shape. The projection 544 functions as a restricting part (in other words, a wheel-off prevention part) that restricts the outward movement of the wheel portion 31, which is placed on the bottom surface 542, so that it does not move outward and come off the recess 54. The vertical length L3 from the bottom surface 542 to the upper end of the projection 544 (the vertical length of the projection 544) is shorter than the vertical length L1 of the recess 54. Specifically, the vertical length L3 of the projection 544 is about half the vertical length L1 of the recess 54. The projection 544 has an inclined surface 545.

[0033] The inclined surface 545 of the protruding portion 544 is continuous with the bottom surface 542 and is inclined upward toward the radially inward direction. The inclined surface 545 is a concave curved surface. The tire 312 of the wheel portion 31, which is placed on the bottom surface 542, contacts the inclined surface 545.

[0034] Below the protruding portion 544, as described above, is a pivot shaft 323 that allows the wheel portion 31 to rotate relative to the upper piece 321 of the caster portion 3. As a result, as shown in Figure 6, even when the wheel portion 31 of the rotating caster portion 3 is facing any direction, the tire 312 of the wheel portion 31 contacts the inclined surface 545. This restricts the rotation of the wheel portion 31 around the axis of the wheel axle 311.

[0035] As shown in Figure 4, the vertical length L4 from the lower end of the wheel portion 31 of the caster portion 3 to the wheel axle 311 (the radius of the wheel portion 31) is shorter than the vertical length L5 from the bottom surface 542 to the upper end of the vertical piece 441 (the vertical length L1 of the recess 54 + the vertical length L2 of the vertical piece 52). In other words, the position of the upper end of the vertical piece 52 is set to be higher than the position of the most protruding outer circumference of the wheel portion 31 in the horizontal direction. By setting the position of the upper end of the vertical piece 52 to be higher than the position of the most protruding outer circumference of the wheel portion 31 in this way, the outward movement of the wheel portion 31 is restricted so that the wheel portion 31 does not move outward from the base portion 2 and come off.

[0036] Next, we will explain how the trolley 1 moves when it is stacked.

[0037] When the trolleys 1 are stacked vertically and the trolleys 1 move longitudinally, the four wheel sections 31 of the upper trolley 1 rotate so that they face away from the direction of travel. Here, with the trolleys 1 stacked vertically, the direction of travel is forward, and the opposite side is backward. With the trolleys 1 stacked vertically, the four wheel sections of the upper trolley 1 rotate so that they face backward. At this time, the outer circumferences of the two rear wheel sections 31 of the four wheel sections 31 are configured to contact a part of the vertical section 52 of the lower trolley 1. When the trolleys 1 are moved in a stacked vertical state, the vertical section 52 of the lower trolley 1 also functions as a restricting part (in other words, a derailment prevention part) that restricts the outward movement of the wheel sections 31 of the upper trolley 1 so that the wheel sections 31 of the upper trolley 1, which are stored in the recess 54 of the lower trolley 1, do not move outward and derail from the base section 2 of the lower trolley 1.

[0038] When the trolleys 1 are stacked vertically and the trolleys 1 move in the shorter direction, the four wheel sections 31 of the upper trolley 1 rotate so that they face away from the direction of travel. Here, when the trolleys 1 are stacked vertically, the direction of travel is forward, and the opposite side is backward. When the trolleys 1 are stacked vertically and move, the four wheel sections of the upper trolley 1 rotate so that they face backward. At this time, the outer circumferences of the two rear wheel sections 31 of the four wheel sections 31 are configured to contact a part of the vertical section 52 of the lower trolley 1. When the trolleys 1 are stacked vertically and move, the vertical section 52 of the lower trolley 1 also functions as a restricting part (in other words, a derailment prevention part) that restricts the outward movement of the wheel sections 31 of the upper trolley 1 so that the wheel sections 31 of the upper trolley 1, which are stored in the recess 54 of the lower trolley 1, do not move outward and derail from the base section 2 of the lower trolley 1.

[0039] When the trolleys 1 are stacked vertically and moved, the horizontal piece 51 of the lower trolley 1 forms an area 57 on which the wheels 31 of the upper trolley 1 do not rest. The area 57 on which the wheels 31 of the upper trolley 1 do not rest is the part of the upper surface of the horizontal piece 51 other than the recess 54 formed on the upper surface of the horizontal piece 51. Specifically, the area 57 on which the wheels 31 of the upper trolley 1 do not rest is the part between the recess 54 and the vertical piece 52 of the lower trolley 1 (the space formed between the recess 54 and the vertical piece 52 of the lower trolley 1 on which the wheels 31 of the upper trolley 1 do not rest, when the wheels 31 of the upper trolley 1 are in contact with a part of the vertical piece 52 of the lower trolley 1).

[0040] In the trolley 1 of this embodiment described above, the wheel portion 31 of the upper trolley 1 is housed in the recess 54 of the lower trolley 1, and the protrusion 544 of the lower trolley 1 prevents the wheel portion 31 of the upper trolley 1 from moving, making it difficult for the upper trolley 1 to slide laterally relative to the lower trolley 1.

[0041] Furthermore, in the trolley 1 of this embodiment, the recess 54 is formed along the rotating wheel portion 31, so the wheel portion 31 can be stored in the recess 54 without considering the direction it faces.

[0042] Furthermore, in the trolley 1 of this embodiment, a pivot axis 323 that can pivot relative to the upper piece 321 of the caster section 3 is located below the protruding portion 544. As a result, even if the wheel portion 31 of the pivoting caster section 3 is facing any direction, it will come into contact with the inclined surface 545, thereby restricting the wheel portion 31 from rotating around the axis of the wheel axle 311.

[0043] Next, I will explain some variations.

[0044] The base portion 2 does not necessarily need to have a through portion 20 that penetrates vertically.

[0045] The shape of the base portion 2 is not particularly limited; it may be square in plan view, or it may not be rectangular in plan view. Furthermore, the shapes of the base portion 2 and the trolley 1 do not need to be symmetrical. The size of the base portion 2 is not particularly limited.

[0046] The entire base portion 2 may be made of resin. Alternatively, the entire base portion 2 may be made of metal.

[0047] The shape and size of the caster part 3 are not limited.

[0048] The edge member 4 and the corner member 5 may be formed integrally as the base portion 2.

[0049] The edge member 4 is not limited to having angle members 430, 440, nor is the shape, size, material, etc. of the edge member 4 limited.

[0050] The shape, size, material, etc., of the corner member 5 are not limited.

[0051] The shape and size of the recess 54 of the corner member 5 are not limited, and the recess 54 should be shaped according to the size of the turning range of the wheel portion 31.

[0052] Another example of the recess 54 is shown in Figure 7. In this other example, the bottom surface of the recess 54 in a side view, i.e., the bottom surface 542, is curved. The bottom surface 542 has a shape similar to the outer surface of the wheel portion 31. By making the bottom surface 542 have a shape similar to the outer surface of the wheel portion 31, when the bogies 1 are stacked vertically, the movement of the wheel portion 31 of the upper bogie 1, which is housed in the recess 54 of the lower bogie 1, is suppressed, making it less likely for the upper bogie 1 to shift laterally.

[0053] In the area 57 on the upper surface of the horizontal piece 51 where the wheel portion 31 is not placed, a protrusion that projects upward from the corner support surface 56 or a recess that is recessed one step below the corner support surface 56 may be provided.

[0054] The shape and size of the protrusion 544 of the corner member 5 are not limited.

[0055] The protrusion 544 is not limited to being formed in the center of the bottom surface 542 of the recess 54; the protrusion 544 only needs to be formed on at least a part of the bottom surface 542.

[0056] When the trolleys 1 are stacked vertically, the outer circumference of two of the four wheel portions 31 of the upper trolley 1 is configured to contact a part of the vertical piece. However, the configuration is not limited to this, and at least one of the four wheel portions 31 of the upper trolley 1 may be configured to contact a part of the vertical piece 52 of the lower trolley 1.

[0057] (summary) As described above for one embodiment and its modified form, the trolley 1 of the first embodiment has the following configuration.

[0058] In other words, the trolley 1 in the first embodiment comprises a base portion 2 for placing the load and a caster portion 3. The base portion 2 is composed of a plurality of side members 4 having beam portions 42 that extend laterally and whose upper surface is a side support surface 41, and a plurality of corner members 5 that connect to the plurality of side members 4. The caster portion 3 is attached to the lower surface of each corner member 5. The corner member 5 has a horizontal piece 51 whose upper surface is a corner support surface 56, and a vertical piece 52 that extends upward from the outer edge of the horizontal piece 51. The vertical piece 52 restricts the outward movement of the load. The horizontal piece 51 has a recess 54 for housing the wheel portion 31 of the caster portion 3, and a protrusion 544 that restricts the movement of the wheel portion 31. The protrusion 544 is formed in the center of the recess 54.

[0059] In the first embodiment of the trolley 1 having the above configuration, a recess 54 for housing the wheel portion 31 and a protrusion 544 at the center of the recess 54 that restricts the movement of the wheel portion 31 are provided, making it difficult for the upper trolley 1 to shift laterally relative to the lower trolley 1.

[0060] Furthermore, as with the trolley 1 of the first embodiment and its modified form described above, the trolley 1 of the second embodiment additionally includes the following configuration in addition to the configuration of the first embodiment.

[0061] In other words, in the second embodiment of the trolley 1, the vertical length of the recess 54 is shorter than the vertical length of the vertical piece 52.

[0062] In the second embodiment of the trolley 1 having the above configuration, the upper trolley 1 is less likely to shift laterally relative to the lower trolley 1.

[0063] Furthermore, as with the trolley 1 of the first embodiment and its modified form described above, the trolley 1 of the third embodiment additionally includes the following configuration in addition to the configuration of the first or second embodiment.

[0064] In other words, in the third embodiment of the trolley 1, when the trolleys 1 are stacked vertically, the position of the upper end of the vertical piece 52 of the lower trolley 1 is set to be higher than the position of the most protruding outer circumference of the wheel portion 31 in the horizontal direction of the upper trolley 1.

[0065] In the third embodiment of the trolley 1 having the above configuration, the vertical piece 52 is provided so as to be higher than the position of the most protruding outer circumference of the wheel portion 31, thereby restricting the outward movement of the wheel portion 31 so as not to move outward from the base portion 2 and derail.

[0066] Furthermore, as with the trolley 1 of the first embodiment and its modified form described above, the trolley 1 of the fourth embodiment additionally includes the following configuration in addition to the configuration of any one of the first to third embodiments.

[0067] In other words, in the fourth embodiment of the trolley 1, when the trolleys 1 are stacked vertically and moved, the outer circumferential surface of at least one of the multiple wheel portions 31 of the upper trolley 1 comes into contact with a part of the vertical piece 52 of the lower trolley 1.

[0068] In the fourth embodiment of the trolley 1 having the above configuration, when the trolleys are stacked one level on top of each other, the outward movement of the wheel portion 31 is restricted so that the wheel portion 31 does not move outward from the base portion 2 and come off.

[0069] Furthermore, as with the trolley 1 of the first embodiment and its modified form described above, the trolley 1 of the fifth embodiment additionally includes the following configuration in addition to the configuration of the fourth embodiment.

[0070] In other words, in the fifth embodiment of the trolley 1, when the trolleys 1 are stacked vertically and moved, a region 57 is formed between the recess 54 of the lower trolley 1 and the vertical piece 52 where the wheel portion 31 of the upper trolley 1 is not placed.

[0071] In the fifth embodiment of the trolley 1 having the above configuration, when the trolleys 1 are stacked vertically and moved, the upper trolley 1 is less likely to slide laterally relative to the lower trolley 1, and the wheel section 31 is less likely to come off.

[0072] Although this disclosure has been described above based on the form shown in the attached drawings, this disclosure is merely one example of such a form, and appropriate design modifications are possible within the scope intended by this disclosure. [Explanation of symbols]

[0073] 1 cart 2 base 3. Caster section 31 Wheel section 4 side members 41 Side support surface 42 Beam section 5 Corner members 51 Horizontal piece 52 vertical pieces 54 recess 56 Corner support surface 57 areas 544 Protrusion

Claims

1. It is composed of a plurality of side members having beam sections that extend laterally and whose upper surface serves as a side support surface, and a plurality of corner members that connect to the plurality of side members, and a base section for placing loads on it, A trolley comprising caster parts attached to the lower surface of each of the aforementioned corner members, The aforementioned corner member is A horizontal piece whose top surface serves as a corner support surface, It has a vertical piece that extends upward from the outer edge of the horizontal piece and restricts the outward movement of the load, The aforementioned horizontal piece is, With the aforementioned trolleys stacked vertically, the upper trolley has a recess for housing the wheel portion of the caster section, The recess has a projection formed in the center of the recess that restricts the movement of the wheel portion, When the aforementioned trolleys are stacked vertically, the position of the upper end of the vertical piece of the lower trolley is set to be higher than the position of the outermost protruding part of the wheel section in the horizontal direction of the upper trolley. Dolly.

2. The vertical length of the recess is shorter than the vertical length of the vertical piece. The trolley according to claim 1.

3. When the trolleys are stacked vertically and moved, the multiple wheel portions of the upper trolley are oriented in a direction along the edge member, and the outer circumferential surface of at least one of the multiple wheel portions of the upper trolley is configured to contact a part of the vertical piece of the lower trolley. The trolley according to claim 1 or 2.

4. When the trolleys are stacked vertically and moved, a region is formed between the recess of the lower trolley and the vertical piece in which the wheels of the upper trolley do not rest. The trolley according to claim 3.

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