JPH0318349Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a transportation container for storing various types of machinery, and more particularly to a transportation container whose surface is formed of a corrugated metal plate.

[Background of the idea]

Transport containers are used when transporting various types of machinery, such as by shipping. In the past, this shipping container was made entirely of wood. However, containers made of wood have the drawback of being susceptible to moisture such as rain and prone to corrosion. Additionally, wood has problems such as low strength and heavy weight. Therefore, metal shipping containers have recently been used.

A conventional example of this metal transportation container is disclosed in Japanese Utility Model Application Publication No. 57-44018. In this case, the side plate is formed of a corrugated iron plate (its outer shape is the same as that shown in FIG. 4). A corrugated plate material indicated by the reference numeral 11 in FIG. 7 is used in the above-mentioned conventional transportation container. This corrugated plate material 11 has a main body portion as a corrugated portion 11a.
The edge thereof becomes a flat portion 11b. This flat portion 11b is formed by rolling the corrugated portion 11a. When used as a side plate of a transportation container, this flat portion 11b is fixed to a bottom plate or a ceiling frame.

In this way, when the corrugated plate material 11 is used as the side plate, the section modulus of the corrugated portion 11a is ensured, and there is an advantage that the durability against vertical loads is increased.

[Problem that the invention attempts to solve]

In the above-mentioned conventional transport container, the flat portion 11b is formed by rolling on the edge portion of the corrugated portion 11a.If the flat portion 11b is formed by rolling using a press, the amount of shrinkage of the plate during rolling Non-uniform areas occur. That is, as shown in FIG.
When rolling 1b, the plate is elongated in the portions that remain as the peaks A of the waveform, and the plate does not elongate in the portions that become the troughs B. Due to the elongation of the material of the peak portion A, tensile stress is generated in the step surface 11c at the boundary between the corrugated portion 11a and the flat portion 11b in the direction of arrow T, and cracks are likely to occur. Furthermore, in the flat portion 11b, since the material in the portions that were peaks before rolling is rolled in an elongated state, the material in portions C that are continuous with the portions that were valleys are compressed and wrinkles occur. These wrinkles make it difficult to maintain the flatness of the flat portion 11b.
Even after rolling, a shallow wave shape tends to remain on the flat portion 11b. Further, in this type of corrugated plate material 11, at the boundary between the corrugated portion 11a and the flat portion 11b,
The flat portion 11b is easily bent from this boundary portion, which also has the disadvantage that the shape of the entire transport container is likely to be distorted.

This invention solves the above-mentioned conventional problems, and when forming the flat part of a corrugated metal plate, it prevents cracks on the stepped surface and wrinkles in the flat part, and makes it possible to form the flat part of the corrugated metal plate. The object of the present invention is to provide a transportation container that has high strength at the boundary between the two parts and prevents bending of the plate material.

[Specific measures to solve the problem]

In the transportation container according to the present invention, the surface of the box body is made of a plate material with a corrugated cross section, and a flat part with a rolled corrugation is formed at the edge of this board material, and this flat part is used for the ceiling or bottom. The transport container is joined to the edge of the plate material, and at the boundary between the corrugated part and the flat part of the plate material, a rib is formed that is continuous with the step surface between the corrugated part and the flat part and is raised from the valley. It is what it is.

[Effect]

In this transport container, the surface is formed of a corrugated plate material, and the corrugated plate material is raised from the trough of the wave at the boundary between the corrugated part and the flat part, and has a level difference between the corrugated part and the flat part. Since continuous ribs are formed on the surface, material remains on the raised parts of the ribs, which reduces the tensile stress that acts on the step surface of the wave crests when rolling the crests, and prevents cracks. Less likely to occur. Also, since material remains on the ribs,
There is less material concentrated in the part that is flattened by rolling and is continuous with the valley, and there is no uneven concentration of material between the parts that were ridges and the parts that were valleys in the flat part, and the material in the flat part is reduced. This means that a high degree of flatness can be maintained. Also, because the ribs are formed, the strength of the boundary between the corrugated part and the flat part is increased,
The flat portion is less likely to bend, and the overall shape of the transport container will not be distorted.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a perspective view showing a corrugated plate material 1 used in a shipping container according to the present invention, and FIG. 2 is a cross-sectional view of the corrugated plate material fixed to the bottom plate 2, and is a cross-sectional view taken from FIG. , FIG. 3 is a perspective view of the corrugated board 1 fixed to the bottom plate 2 as seen from the outside of the container, FIG. 4 is an external perspective view of the shipping container according to the present invention, and FIG. 5 is the ceiling portion thereof. 6 is a partial sectional view of the bottom plate portion.

The corrugated plate material 1 shown in FIG. 1 is used as a side plate of a shipping container shown in FIG. 4. Flat portions 1b are provided on both end sides of the corrugated portion 1a of this corrugated plate material 1.
is formed. In addition, the corrugated portion 1a and the flat portion 1
A rib 1d is formed at the boundary with b. The rib 1d is formed at a position connecting the skirts of the crests A of adjacent waves in the trough B of the corrugated portion 1a, and has an approximately triangular cross-section raised in the same direction as the crests A. It is formed by Also, this rib 1
The end surface 1e of d is the step surface 1c at the end of the corrugated portion 1a.
It is formed on the same surface as the

The flat portion 1b and the rib 1d are formed by pressing. The lower mold and upper mold used for press molding have an uneven part and a flat part 1 corresponding to the corrugated part 1a.
A pressing surface corresponding to b and an uneven portion corresponding to the shape of the rib 1d are formed in advance. As the corrugated plate material 1, a commercially available corrugated plate material that has been previously formed into a corrugated shape can be used.
This corrugated plate material 1 is placed on a lower die, and first, the end portion of the corrugated plate material 1 is rolled by the upper die to form a flat portion 1b. Next, the corrugated plate material 1 is pressed from above to form ribs 1d and stepped surfaces 1c corresponding to the shape of the mold.

By forming the ribs 1d in a raised manner during press molding, various defects that occurred in the conventional structure shown in FIG. 7 are eliminated. That is, the seventh
In the figure, the end of the wave trough B is connected to the flat part 11b.
Since it is continuous with the flat part, when rolling the flat part,
The periphery of the wave and the step surface 11c are pulled in the direction of the arrow, making it easy for cracks to occur, but in the device of the present invention shown in FIG. It becomes possible to reduce the tensile stress in the direction, and cracks will not occur in the stepped surface 1c due to rolling of the flat portion 1b. In addition, in the conventional model shown in Fig. 7, there are many wrinkles in the C part continuous with the valley part B, but in the present invention shown in Fig. 1, the wrinkles should be gathered in the C part by the raised rib 1d. Surplus material will be reduced,
This means that wrinkles occurring in the C portion can be reduced. Therefore, the flatness of the flat portion 1b can be maintained at a high level. Furthermore, the presence of the ribs 1d makes it possible to increase the strength of the boundary between the corrugated portion 1a and the flat portion 1b, making it difficult for bending to occur at the boundary.

Next, the structure of the transport container shown in FIG. 4 will be explained.

The corrugated plate material 1 is used as a side plate of a container, and the flat part 1b formed at the lower end of the corrugated plate material 1 is attached to the side edge of the wooden bottom plate 2, and fixed by nails 3. (See Figures 3 and 6). At this time, the step surface 1c and the end surface 1e of the rib 1d
is installed on the upper surface of the bottom plate 2 (see FIGS. 2 and 3). The weight of the corrugated plate material 1 itself serving as the side plate as well as the weight of the ceiling part are supported by the bottom plate 2 by the wide area formed by the flat surface 1c and the end surface 1e of the rib 1d. Note that pickpockets 5 are fixed to the substrate 4 at the lower ends of both sides of the bottom plate 2. Further, as shown in FIG. 5, a flat portion 1b formed at the upper end of the corrugated plate 1
The nails 9 are attached to the side edges of the wooden frame 6 in the ceiling.
is nailed and fixed.

Further, a flat ceiling plate 8 is fixed to the upper surface of the frame 6. This ceiling board 8 has a bent part 8a formed at its side end, and this bent part 8a is overlapped with the flat part 1b at the upper end of the side board, and the bent part 8a and the flat part 1b are connected by the nails 7. Both are nailed to the frame 6.

In the illustrated embodiment, the corrugated plate 1 on which the flat portion 1b and ribs 1d are formed is used as the side plate of the shipping container, but the corrugated plate 1 may also be used as a ceiling plate. May be used for the bottom plate. When used as a bottom plate, a hollow frame is assembled from wood, and the corrugated portion 1 of the corrugated plate material 1 is
a is located in the hollow part, and the flat part 1b is fixed to the upper surface of the frame. In this case, the items stored in the container will be supported by the corrugated portions 1a of the corrugated plate material 1.

[Effect of idea]

As described above, according to the present invention, the following effects can be achieved.

(1) In transportation containers using corrugated plate materials, ribs connecting adjacent corrugations are raised and integrally formed at the boundary between the corrugated part and flat part of the plate material, so that when forming the flat part, , it is possible to prevent a large tensile stress from acting on the step surface that is the boundary between the corrugated portion and the flat portion, and to prevent the occurrence of cracks. Furthermore, since the ribs are formed, the amount of wrinkles in the flat portion is also minimized. Therefore, the concentration of material on the flat portion is alleviated, and the flatness of the flat portion can also be easily achieved.

(2) The ribs increase the strength at the troughs of the waves, thereby reinforcing the bending strength. Therefore, the corrugated plate material becomes difficult to bend, which not only makes handling of the material easier, but also facilitates positioning when fixing the flat portion to a frame or the like.

(3) As shown in FIG. 3, when the corrugated plate is fixed to the side plate of the container, both the step surface and the end surface of the rib are installed on the bottom plate. Therefore, the area of contact with the bottom plate becomes larger, and the strength against the weight of the side plates and the ceiling increases.

[Brief explanation of the drawing]

Figures 1 to 6 show examples of the present invention. Figure 1 is a perspective view showing the end of a corrugated plate, and Figure 2 is a perspective view of the corrugated plate fixed to the bottom plate. - Sectional view; Figure 3 is a partial perspective view showing the part where the corrugated plate is fixed to the bottom plate from the outside of the container;
The figure is a perspective view showing the entire shipping container, Figure 5 is a partial sectional view of the ceiling, Figure 6 is a partial sectional view of the bottom plate, and Figure 7 is a corrugated plate material used in conventional shipping containers. FIG. 1... Corrugated plate material, 1a... Waveform part, 1b... Flat part, 1c... Step surface, 1d... Rib, 1e...
End face of rib, A...crest, B...trough, 2...bottom plate, 6...ceiling frame, 8...ceiling plate.

Claims (1)

[Scope of utility model registration request] The surface of the box is made of a board with a corrugated cross section, and a flat part is formed by rolling the corrugation at the edge of this board, and this flat part is joined to the edge of the ceiling or bottom. A transport container, wherein a rib is formed at the boundary between the corrugated part and the flat part of the plate material, the rib being raised from the trough and continuous with the step surface between the corrugated part and the flat part.