JP4528163B2 - Conveyor cart, base board and transport cart set - Google Patents

Description

  The present invention relates to a transport cart having a lattice-shaped rib on its lower surface and capable of transporting containers and other loads, a platform provided in such a transport cart, and a transport cart set including a transport cart and a container.

The conventional transport cart 1 shown in FIG. 10 includes a frame-shaped ridge 2 projecting from the upper surface edge of the platform 1A. When the container 3 is placed on the platform 1A, the frame-shaped ridge 2 is The container 3 is structured to be prevented from slipping by engaging with the lower edge portion (see, for example, Patent Document 1). Further, another conventional transport cart 4 shown in FIG. 11 has a structure in which a plurality of ribs 5A and a rubber member 5B are provided on the upper surface of the base plate 4A to prevent the load from slipping (for example, Patent Document 2). reference). Further, another conventional transport carriage 6 shown in FIG. 12 has a structure in which a plurality of dot-like projections 7 are provided on the upper surface of the base 6A to prevent the load from slipping (for example, see Patent Document 3). .
Japanese Patent Laid-Open No. 10-71955 (paragraph [0008], FIG. 1) JP-A-8-26120 (paragraph [0010], FIG. 1) Japanese Patent Laid-Open No. 7-257385 (paragraph [0018], FIG. 2)

  However, in the transport cart 1 described above, if the container 3 is too small, a situation in which the container 3 slips within the frame-shaped ridge 2 may occur. On the other hand, if the container 3 is too large, the container 3 is placed on the frame-shaped ridge 2 and floats from the upper surface of the base plate 1A. At this time, since it is difficult to think that the frame-shaped ridge 2 bites into the container 3 made of synthetic resin, the frame-shaped ridge 2 not only has no anti-slip effect, but rather the container is formed by the frame-shaped ridge 2. 3 becomes slippery. Similarly, in the other transport carts 4 and 6 described above, the container floats from the upper surface of the base plates 4A and 6A due to the ribs 5A or the dot-like projections 7, and the container cannot be sufficiently prevented from slipping. Further, since the conventional transport carriage 4 includes the rubber member 5B different from the whole material of the base 4A, there is a problem that the manufacturing cost increases. Further, in the transport cart 1, when a relatively large cardboard box is transported, the cardboard box is placed on the frame-shaped ridge 2, which may cause a problem of excessive bending and deformation.

  The present invention has been made in view of the above circumstances, and it is possible to prevent the containers from slipping regardless of the size of the containers placed on the baseboard, and to provide the cardboard placed on the baseboard. It is an object of the present invention to provide a transport cart, a base plate, and a transport cart set that can prevent excessive deformation of the box.

The platform according to the invention of claim 1 made to achieve the above object is a platform for a transport carriage capable of carrying a container or other cargo having a lattice-shaped rib on the lower surface and transporting it on the upper surface. comprising a projects into a square space surrounded by the lattice rib projection assembly comprising a lattice-shaped rib and uneven engagable ribs engaging protrusion on the upper surface, each rib engaging projections constituting the projection assembly The protrusions are characterized in that the protruding amount gradually decreases as they move away from the center of the protrusion assembly .

  The invention according to claim 2 is characterized in that, in the base plate according to claim 1, the rib engaging projection is tapered from the lower end portion toward the upper end portion.

  According to a third aspect of the present invention, in the platform according to the first or second aspect, the planar shape of the platform is a rectangle, and at least some of the plurality of rib engagement protrusions are ± 45 with respect to the longitudinal direction of the platform. It is characterized by being arranged at equal intervals in both directions tilted.

  According to a fourth aspect of the present invention, in the pedestal according to any one of the first to third aspects, the planar shape of the pedestal is rectangular, and at least a part of the plurality of rib engagement protrusions is formed in both vertical and horizontal directions of the pedestal. It is characterized by being arranged at equal intervals.

  The invention according to claim 5 is the pedestal according to claim 3 or 4, wherein the plurality of rib engaging projections are inclined in both the vertical and horizontal directions of the pedestal or both directions inclined by ± 45 degrees with respect to the vertical direction of the pedestal. Thus, there is a feature in that a plurality of projection assemblies arranged at equal intervals are provided at intervals.

  The invention of claim 6 is characterized in that, in the base plate according to claim 5, the projection assembly is disposed on the outer edge portion of the base plate, and a flat surface is provided in the central portion of the base plate.

According to a seventh aspect of the present invention, in the base according to any one of the first to sixth aspects, each rib engaging projection constituting the projection assembly has a circular planar shape and is formed from the center of the projection assembly. farther laterally, having characterized in that the outer diameter of the planar shape is configured to gradually large kuna so that.

According to an eighth aspect of the present invention, in the base according to any one of the first to seventh aspects, the rib engaging protrusion disposed at the central portion of the protrusion assembly has a hemispherical shape and is separated from the central portion of the protrusion assembly. The rib engaging protrusions arranged at the above positions are characterized in that the upper part of the hemispherical rib engaging protrusions is cut away from a predetermined horizontal plane.

According to a ninth aspect of the present invention, in the base according to any one of the first to eighth aspects, the portion of the base on which the load can be placed does not have a protruding portion protruding upward beyond the rib engaging protrusion. It is characterized by a substantially flat shape.

A transport cart according to the invention of claim 10 is characterized in that a plurality of casters are provided on the bottom surface of the base plate according to any one of claims 1 to 9 .

A transport cart set according to an invention of claim 11 is characterized in that it comprises the transport cart according to claim 10 and a container having lattice-shaped ribs that can be engaged with the rib engaging projections of the transport cart. Have.

[Inventions of Claims 1, 10 , 11 ]
Claim 1, according to the arrangement 10, 11, when placing the container Taiban, a plurality of ribs engaging projection provided in the weighing table is entered in the square space lattice ribs provided on the bottom surface of the container Engage with the concave and convex. Therefore, as long as the container is provided with a lattice-shaped rib that can be engaged with a plurality of rib engagement protrusions on the lower surface, any container of any size can be prevented from slipping simply by being placed on the base plate. Can be planned. Thereby, the efficiency of the conveyance work is improved. In addition, according to the configuration of the present invention, each rib engagement projection constituting the projection assembly is configured such that the protrusion amount gradually decreases as the distance from the center portion of the projection assembly is increased. The level difference between the projection assembly and the portion other than the projection assembly is suppressed. Thereby, when a cardboard box is mounted, deformation of the cardboard box can be reduced.

[Invention of claim 2]
Since the rib engagement protrusion provided in the base plate of the second aspect is tapered from the lower end portion toward the upper end portion, it can be easily engaged with the lattice rib of the container.

[Invention of claim 3]
According to the platform of claim 3, when the grid-shaped rib inclined ± 45 degrees with respect to the vertical and horizontal sides of the container is provided, the rib-engaging protrusions engage with the grid-shaped rib, The vertical and horizontal sides of the base plate and the vertical and horizontal sides of the container can be made parallel.

[Invention of claim 4]
According to the stand of claim 4, when the grid-shaped rib parallel to the vertical and horizontal sides of the container is provided, the rib engaging projection is engaged with the grid-shaped rib, The vertical and horizontal sides and the vertical and horizontal sides of the container can be made parallel.

[Invention of claim 5]
In the base of claim 5, since the projection aggregates comprising a plurality of rib engaging projections are provided at intervals, the grid ribs corresponding to the rib engaging projections, and other ribs that do not correspond In the case of having both of the above, it is possible to avoid the other ribs, and to reliably engage the rib engaging protrusions with the lattice-shaped ribs in the uneven manner.

[Invention of claim 6]
When the cardboard box is placed on the base plate according to claim 6, it is possible to avoid deformation of the cardboard box by avoiding the rib engagement protrusions by placing the cardboard box on a flat surface provided at the center of the base plate. .

[Invention of Claim 7 ]
The rib-engaging projections constituting the projection assembly provided on the base plate according to claim 7 are configured such that the protruding amount decreases as the projections are separated from the central portion of the projection assembly. When the container provided with is placed, the rib engaging protrusions enter the grid space of the lattice-shaped ribs in the order from the center of the protrusion assembly toward the outside. Here, the rib engagement protrusions have a planar outer diameter that gradually increases as they move away from the center of the protrusion assembly. By entering the space, the container is roughly positioned, and the container is gradually and finely positioned as the outer rib engaging projections sequentially enter the grid space of the lattice-shaped rib. Thereby, the play of the uneven | corrugated engagement of a processus | protrusion aggregate | assembly and a lattice-shaped rib can be reduced.

[Invention of Claim 8 ]
In the base plate of claim 8 , the rib engaging projections constituting the projection assembly are hemispherical, or the hemispherical upper part is cut out to a flat surface, so that the cardboard box is placed In addition, it is possible to reduce the bite of the rib engagement protrusion into the cardboard box.

[Invention of claim 9 ]
Since the portion on which the load is placed in the base plate of claim 9 has a substantially flat shape that does not have a protruding portion that protrudes upward beyond the rib engagement protrusion, when the cardboard box is placed, The deformation to the cardboard box can be reduced.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the transport cart 10 of this embodiment includes casters 12 at the four corners of the bottom surface of the base plate 11. The base plate 11 is an injection-molded product of synthetic resin, and has a structure in which reinforcing ribs 14 (see FIG. 2) are stretched around the lower surface of a rectangular top plate wall 13 on which a load is placed. In addition, the base plate 11 has a symmetrical shape with respect to both the vertical and horizontal centerlines.

  A gripping hole 15 is formed in each of the positions near the four vertical and horizontal outer edges of the base 11. Each gripping hole 15 penetrates the base plate 11 in the vertical direction and has a long hole shape along each outer edge portion. The carriage 10 can be easily lifted by hand through any of the gripping holes 15.

  Caster receiving recesses 17 are recessed and formed at the four corners of the upper surface 11A of the base plate 11 (specifically, the upper surface of the top wall 13). Each of the caster receiving recesses 17 has a circular planar shape, and has an inner side surface 17A that is reduced in diameter as it goes downward from the upper end opening, and a bottom surface 17B that is parallel to the upper surface 11A of the base plate 11. The caster receiving recess 17 is equally divided into four regions by four dividing ribs 17L. Each of the divided ribs 17L extends from the inner side surface 17A to the vicinity of the center of the bottom surface 17B, the lower end portion of the divided rib 17L is continuous with the bottom surface 17B, and the upper end portion of the divided rib 17L is connected to the upper surface of the base plate 11. It is the same. A central convex portion 17C stands from the center of the bottom surface 17B of the caster receiving recess 17. The central convex portion 17C includes four ridge lines projecting toward each of the divided ribs 17L, forms a substantially star shape having a concave curved surface between the adjacent ridge lines, and the upper surface of the central convex portion 17C is It is flush with the upper surface 11 </ b> A of the base 11. When the transport cart 10 is stacked on the transport cart 10, the wheels 12 </ b> A of the casters 12 of the upper transport cart 10 are received in the caster receiving recesses 17 of the lower transport cart 10. At this time, the wheel 12A of the caster 12 is accommodated in one of the caster receiving recesses 17 divided by the dividing rib 17L, and the turning of the wheel 12A is restricted, and the upper surface 11A of the base 11 and the caster receiving Rolling of the wheel 12A is restricted by a step with the bottom surface 17B of the recess 17.

  Now, as shown in FIG. 1, projection assemblies 20 are provided at four locations on the upper surface 11 </ b> A of the base 11. Specifically, each projection assembly 20 is sandwiched between the caster receiving recesses 17 and the gripping holes 15 between a pair of caster receiving recesses 17, 17 arranged in the longitudinal direction of the base 11. It is arranged in the part. Further, the entire upper surface 11 </ b> A of the base 11 has a substantially flat shape that does not have a protruding portion protruding upward beyond the rib engaging protrusion 21. In particular, the central portion of the upper surface 11A of the base plate 11 is a flat surface 11B having not only a protrusion but also a recess.

  As shown in FIG. 3, the protrusion assembly 20 includes a plurality of rib engaging protrusions 21, and the rib engaging protrusions 21 are inclined in the first direction X inclined by +45 degrees with respect to the longitudinal direction H of the base plate 11. And the second direction Y inclined by −45 degrees with respect to the vertical direction of the base plate 11 are arranged at intervals L1. Further, the planar shape of the rib engaging projections 21 is a circle having the same outer diameter. Further, when the projection assembly 20 is viewed from the side, as shown in FIG. 2, the protruding amount of the rib engagement projection 21 gradually decreases as the projection assembly 20 moves away from the center of the projection assembly 20.

  Specifically, as shown in FIGS. 2 and 3, at the intersection of the center line CL <b> 1 passing through the center in the first direction X and the center line CL <b> 2 passing through the center in the second direction Y in the projection assembly 20. A hemispherical rib engagement protrusion 21 is disposed. A total of four rib engaging protrusions 21 are arranged at intervals L1 on both sides of the hemispherical rib engaging protrusion 21 along one center line CL1, and the other center line CL2 A total of four rib engaging protrusions 21 are arranged at intervals L1 on the both sides centering on the hemispherical rib engaging protrusions 21. Here, each rib engaging projection 21 separated from the hemispherical rib engaging projection 21 by a distance L1 along the center lines CL1 and CL2 is different from the upper end of the hemispherical rib engaging projection 21 by 1 in radius. It cut | disconnected in the horizontal surface which passes the position of about / 3, and cut | disconnected the upper part from the horizontal surface, and it has become a substantially arm shape. Further, the rib engagement protrusion 21 that is spaced apart from the substantially arm-shaped rib engagement protrusion 21 to the side by a distance L1 is a position where the hemispherical rib engagement protrusion 21 is about 2/3 of the radius from its upper end. It cut | disconnected in the horizontal surface which passes through, and cut | disconnected the upper part from the horizontal surface, so to speak, it has become a substantially mirror shape. Further, a substantially mirror-shaped rib engaging projection 21 is also formed at a midpoint between the substantially mirror-shaped rib engaging projections 21 and 21 that are adjacent to each other on the center lines CL1 and CL2 in the vertical and horizontal directions of the base plate 11. Each is provided.

  FIGS. 4 to 6 show an example of a container 30 as a load transported by the transport cart 10. The container 30 has a rectangular parallelepiped housing structure, and the planar shape is substantially the same rectangle as the base plate 11. As shown in FIG. 6, the lower surface 30 </ b> A of the container 30 is provided with an outer frame rib 33 at a position where the outer edge portion of the lower surface 30 </ b> A is shifted inward, and latticed over the entire rectangular region surrounded by the outer frame rib 33. Shaped ribs 31 are stretched around.

  The outer frame rib 33 has a structure in which frame-shaped ribs 33A and 33B that are substantially similar to the outer edge shape of the lower surface 30A are doubled inward and outward, and the rectangular ribs 33A and 33B are connected by a plurality of connecting ribs 33C. It has become. Further, as shown in FIG. 5, the outer frame-shaped rib 33B has a slightly smaller protruding amount from the lower surface 30A than the inner frame-shaped rib 33A, and the lower end portion of the connecting rib 33C is the outer frame. The lower end portion of the shaped rib 33B and the lower end portion of the inner frame-shaped rib 33A are inclined so as to be connected linearly. That is, the corners of the entire rib provided on the lower surface 30A of the container 30 are chamfered.

  In addition, by providing the chamfered portion on the lower surface of the container 30 as described above, the container 30 can be smoothly moved on the roller conveyor as described in Japanese Utility Model Publication No. 59-94089.

  As shown in FIG. 6, the lattice-shaped rib 31 includes a plurality of ribs extending in the first direction x inclined by +45 degrees with respect to the vertical direction h of the lower surface 30A and arranged at equal intervals L1, and the vertical direction of the lower surface 30A. A plurality of ribs extending in the second direction y inclined by −45 degrees with respect to each other and arranged at equal intervals L1 are orthogonal to each other. Further, the lower end portion of the lattice-shaped rib 31 is flush with the lower end portion of the inner frame-shaped rib 33A in the outer frame rib 33 described above.

Next, the operation of the present embodiment configured as described above will be described.
When the container 30 described above is transported using the transport carriage 10 of the present embodiment, for example, the outer edge of the container 30 and the outer edge of the base 11 of the transport carriage 10 are matched with each other on the base 11. The container 30 may be placed on the container. Then, as shown in FIGS. 6 and 7, each rib engaging projection 21 of the projection assembly 20 provided on the base plate 11 enters the grid space 32 of the lattice-shaped rib 31 provided on the lower surface 30 </ b> A of the container 30. Engage with the concave and convex. Here, since each rib engagement protrusion 21 is tapered from the lower end portion toward the upper end portion, it can be easily engaged with the lattice-shaped rib 31 of the container 30 in a concave-convex manner. The container 30 is prevented from slipping on the base plate 11 by the concave and convex engagement between the rib engaging protrusion 21 and the lattice-shaped rib 31.

  In FIG. 8, an elongated container 35 and smaller containers 36 and 37 are placed on the platform 11 of the transport carriage 10 as compared with the container 30 described above (hereinafter referred to as “standard container 30” as appropriate). The state is shown. These containers 35, 36, and 37 have the same lattice ribs as the lattice ribs 31 of the standard container 30 on the lower surface. The elongate container 35 is, for example, arranged on one end side in the longitudinal direction of the base plate 11 with the outer edge portion of the container 35 parallel to the outer edge portion of the base plate 11, and both ends projecting to the side of the base plate 11. In this state, the pair of protrusion aggregates 20 and 20 are covered and placed. In addition, the small containers 36 and 37 are arranged, for example, with the outer edges of the containers 36 and 37 parallel to the outer edges of the base plate 11, and the protrusions 20 and 20 on the other end side in the longitudinal direction of the base plate 11. Respectively. As a result, as in the case of the standard container 30 described above, the rib engagement protrusions 21 of the protrusion assemblies 20 are engaged with the grid ribs on the lower surfaces of the containers 35, 36, and 37 to prevent slippage. Figured.

  Further, in the base plate 11 of the present embodiment, since a plurality of projection assemblies 20 including a plurality of rib engaging projections 21 are provided at intervals, ribs are provided like the lower surface 30A of the standard container 30 shown in FIG. When both of the lattice-shaped rib 31 that engages with the engaging protrusion 21 and the other rib (outer frame rib 33) that cannot engage with the engaging protrusion 21 are provided. By avoiding the outer frame ribs 33), the rib engaging projections 21 can be surely engaged with the lattice-shaped ribs 31 in an uneven manner.

  In the case where a cardboard box or the like is transported by the transport cart 10 instead of the containers 30, 35, 36, and 37, for example, a relatively small cardboard box is provided in the central portion of the base plate 11 of the transport cart 10. It may be placed on the flat surface 11B. As a result, the cardboard box can be transported without being deformed by the rib engaging protrusion 21.

  When a cardboard box having a size equal to or larger than that of the standard container 30 is transported, the cardboard box may be placed on the base 11 so as to cover the projection assembly 20. Here, in the base plate 11 of this embodiment, each rib engagement protrusion 21 which comprises the protrusion assembly 20 is comprised so that protrusion amount may become small gradually as it separates from the center part of the protrusion assembly 20 to the side. Therefore, the level difference between the projection assembly 20 and a portion other than the projection assembly 20 is suppressed. In addition, the rib engagement protrusions 21 constituting the protrusion assembly 20 are hemispherical or have a shape formed by cutting away the upper part of the hemispherical shape to form a flat surface 11B. Excessive bite into the cardboard box is also prevented. Thereby, the deformation | transformation to a cardboard box can be reduced.

Here, when the lower surface is provided with a chamfered portion as in the standard container 30 described above, conventionally, a relatively large protruding portion (for example, FIG. 10) that can be locked to the upper edge portion of the chamfered portion. Although the frame-shaped protrusion 2) in the conventional base plate 1A shown in FIG. 1 has to be provided, the base plate 11 of the present embodiment is located above the rib engaging protrusion 21 at a portion where a load can be placed. Since it has a substantially flat shape that does not have a protruding portion that protrudes, even if a relatively large cardboard box is placed, a situation in which the cardboard box is excessively bent and deformed can be prevented.

  As described above, according to the configuration of the transport carriage 10 and the base plate 11 of the present embodiment, the container having the lower surface 30 </ b> A having the lattice-shaped ribs 31 that can be engaged with the plurality of rib engaging protrusions 21 provided on the base plate 11. As long as it is a container of any size, it can be prevented from slipping only by being placed on the base plate 11. Further, when the lattice-shaped rib 31 inclined by ± 45 degrees with respect to the vertical and horizontal sides is provided on the lower surface of the container, the rib engaging projection 21 is engaged with the lattice-shaped rib 31 so that the base plate 11 The vertical and horizontal sides of the container 30 and the vertical and horizontal sides of the container 30 can be made parallel to each other. Moreover, when the cardboard box is placed, the cardboard box is not excessively deformed. Thereby, the efficiency of the conveyance work is improved.

[Second Embodiment]
This embodiment is shown in FIG. 9, and the configuration of the rib engagement protrusions 21 in the protrusion assembly 20 is different from that of the first embodiment. That is, each rib engagement protrusion 21 constituting the protrusion assembly 20 of the present embodiment has a planar outer diameter that gradually increases as the distance from the center of the protrusion assembly 20 is increased. More specifically, as compared with the hemispherical rib engaging protrusion 21 disposed at the center of the protrusion assembly 20, the substantially spherical arm-shaped part spaced apart from the hemispherical rib engaging protrusion 21 to the side by a distance L1. The outer diameter of the rib engaging protrusion 21 is larger, and the outer diameter of the substantially mirror-shaped rib engaging protrusion 21 that is separated from the substantially arm-shaped rib engaging protrusion 21 to the side by a distance L1 is larger. It is getting bigger. The substantially mirror-shaped rib engaging projection 21 is fitted in a state inscribed in the grid space 32 of the lattice-shaped rib 31. Since the other configuration is the same as that of the first embodiment, the same reference numeral is assigned to the same configuration as that of the first embodiment, and redundant description is omitted.

  Each rib engagement protrusion 21 constituting the protrusion assembly 20 of the present embodiment is configured such that the protrusion amount decreases as the distance from the central portion of the protrusion assembly 20 to the side is the same as in the first embodiment. Therefore, when the container 30 is placed, the rib engagement protrusions 21 enter the grid space 32 of the lattice-shaped ribs 31 in the order from the center of the protrusion assembly 20 toward the outside. Here, since the rib engagement protrusion 21 has a planar outer diameter that gradually increases as the distance from the center of the protrusion assembly 20 increases, the rib engagement protrusion 21 at the center of the protrusion assembly 20 is latticed. The container 30 is roughly positioned by entering the grid space 32 of the shaped rib 31, and the container 30 gradually becomes finer as the outer rib engaging projections 21 sequentially enter the grid space 32 of the lattice-shaped rib 31. Positioned. Thereby, the play of the uneven | corrugated engagement with the protrusion assembly 20 and the lattice-shaped rib 31 can be reduced.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first embodiment, the rib engagement protrusion 21 constituting the protrusion assembly 20 has a hemispherical shape, a substantially arm shape, or a substantially mirror-shaped shape. For example, a conical shape, a pyramid shape, or a conical shape is used. A trapezoidal shape, a truncated pyramid shape, a cylindrical shape, or a prismatic shape may be used.

  (2) Although the base plate 11 of the first embodiment is not provided with a protruding portion that protrudes upward beyond the rib engagement protrusion 21, the base plate and the transport carriage provided with such a protrusion are also provided. It is included in the scope of the present invention.

  (3) The platform 11 of the first embodiment has a rectangular planar shape, but the shape of the platform 11 is not limited to a rectangle, and may be a square, a circle, or a polygon.

  (4) Although the platform 11 of the first embodiment includes the caster receiving recess 17, the platform may not have the caster receiving recess.

The perspective view of the conveyance trolley concerning a 1st embodiment of the present invention. Perspective view with a part of the base plate broken Partial plan view of the base plate Side view of base and container Front view of base plate and container Bottom view of container with rib engagement protrusion engaged Partial sectional view of the platform and the container at the A-A fractured surface of FIG. A perspective view of a state in which a plurality of containers are placed on a transport cart Partial sectional view of the platform and container of the second embodiment A perspective view of a conventional carriage A perspective view of a conventional carriage Plan view of a conventional transport cart

DESCRIPTION OF SYMBOLS 10 Conveyance trolley 11 Base 11A Upper surface 11B Flat surface 12 Caster 20 Protrusion assembly 21 Rib engagement protrusion 30 Container 30,35,36,37 Container 30A Lower surface 31 Grid-shaped rib 32 Grid space 33 Outer frame rib (other ribs)

Claims (11)

In the platform for a transport carriage that can transport containers and other loads with lattice-shaped ribs on the bottom surface,
Provided on the top surface is a projection assembly consisting of a plurality of rib engaging projections that can enter the mesh space surrounded by the grid-shaped ribs and engage with the grid-shaped ribs in an uneven manner ,
Each of the rib engaging protrusions constituting the protrusion assembly is configured such that the protrusion amount gradually decreases as the distance from the central portion of the protrusion assembly increases .   The base plate according to claim 1, wherein the rib engagement protrusion is tapered from the lower end portion toward the upper end portion.   The planar shape of the base plate is rectangular, and at least a part of the plurality of rib engagement protrusions are arranged at equal intervals in both directions inclined by ± 45 degrees with respect to the vertical direction of the base plate. Item 3. The platform according to item 1 or 2.   The planar shape of the base plate is a rectangle, and at least a part of the plurality of rib engaging projections are arranged at equal intervals in both vertical and horizontal directions of the base plate. The described platform.   A plurality of rib engaging protrusions are arranged at equal intervals in both vertical and horizontal directions of the base plate or in both directions inclined by ± 45 degrees with respect to the vertical direction of the base plate. The base plate according to claim 3 or 4, wherein a plurality of the open base plates are provided.   The platform according to claim 5, wherein the projection assembly is disposed on an outer edge portion of the platform, and a flat surface is provided at a central portion of the platform. Each rib engagement protrusion constituting the protrusion assembly has a circular planar shape and is configured such that the outer diameter of the planar shape gradually increases as the distance from the central portion of the protrusion assembly is laterally increased. The platform according to any one of claims 1 to 6, wherein the platform is provided. The rib engaging protrusion disposed at the center of the protrusion assembly has a hemispherical shape, and the rib engaging protrusion disposed at a position away from the central portion of the protrusion assembly includes the hemispherical rib engagement. The base plate according to any one of claims 1 to 7, wherein the base plate has a shape obtained by cutting an upper portion of the joint protrusion from a predetermined horizontal plane. The portion of the base plate on which a load can be placed has a substantially flat shape that does not have a protruding portion that protrudes upward beyond the rib engaging protrusion. The platform described in. A conveying cart comprising a plurality of casters on a lower surface of the base plate according to any one of claims 1 to 9. A transport cart set comprising: the transport cart according to claim 10; and a container having the grid-shaped ribs that can be engaged with the rib engagement protrusions of the transport cart.

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