JP3857759B2 - Storage container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage container which is formed by plastic injection molding surrounded by a bottom surface and a bottom surface and a side wall which spreads upward with a predetermined gradient from the periphery of the bottom surface and has a plurality of perforations on the side wall.
[0002]
[Prior art]
Conventionally, there are various storage containers that are formed by plastic injection molding surrounded by a bottom surface and a side wall that opens upward with a predetermined gradient from the periphery of the bottom surface and the periphery of the bottom surface, and has a plurality of perforations on the side wall.
[0003]
Here, in addition to the pair of molds that open and close in the bottom surface / opening direction, the above-described storage container is generally molded using a slide mold that slides in the side wall direction for molding the perforations. .
[0004]
[Problems to be solved by the invention]
However, as described above, since the slide mold for forming the perforations is required, the mold cost is increased and the time for molding is also increased. As a result, the cost of the product has increased.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive storage container.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the storage container according to the first aspect of the present invention is formed by plastic injection molding which is surrounded by a bottom surface and a bottom surface and a side wall which expands upward with a predetermined gradient from the periphery of the bottom surface. In the storage container, the side wall has a plurality of perforations, and the perforations extend from the side wall outer surface, which is a substantial edge of the perforations, toward the inside in the side wall thickness direction, and adjacent to the upper surface. A first slope surface extending in the same direction as the slope of the side wall and with a small slope toward the upper side of the inner surface of the side wall, and an upper surface from the side wall inner surface serving as a substantially lower edge of the perforation toward the outer side in the thickness direction. A lower surface extending from a tangent to the first inclined surface to a virtual surface extending downward with a gradient of the side wall, and adjacent to the lower surface and below the outer surface of the side wall with a small gradient in the same direction as the gradient of the side wall A second gradient surface extending toward the first surface, a first side surface extending between both ends of the upper surface and the second gradient surface, and extending between both ends of the lower surface and both ends of the first gradient surface. to Ri space der which is surrounded by a second side surface, characterized in that sets the virtual plane to the thickness center of the sidewall.
[0007]
With the above configuration, the upper surface, the second gradient surface, and the first side surface can be molded with a male mold, the lower surface, the first gradient surface, and the second side surface can be molded with the male mold, and the virtual surface Is a contact surface between the male mold and the female mold. Therefore, this perforation can be formed by a pair of male and female molds that open and close in the bottom surface / opening direction.
[0009]
With the above configuration, the upper surface and the lower surface can be set uniformly and with the maximum width.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0011]
FIG. 1 is a front view showing a storage container 1 of the present embodiment, and FIGS. 2 to 4 are a right side view, a plan view, and a bottom view, respectively. 5 and 6 are cross-sectional views taken along line AA and BB in FIG. 1, and FIG. 7 is a cross-sectional view taken along line CC in FIG. The entire storage container 1 is integrally formed by plastic injection molding.
[0012]
The storage container 1 is a container having an inner space surrounded by a side wall 4 having an opening 2 on the upper surface and expanding from the periphery of the bottom surface 3 with a predetermined gradient. At the edge of the opening 2 of the storage container 1, an opening flange 2 a that is bent outward and further bent downward is formed over the entire circumference.
[0013]
The side wall 4 is formed with a plurality of perforations 5 penetrating into and out of the storage container 1. The perforation 5 has an upper surface 5a extending from the outer surface 4a of the side wall 4 toward the inner side in the thickness direction of the side wall 4, and an inner surface 4b of the side wall 4 adjacent to the upper surface 5a in the same direction as the gradient of the side wall 4 and with a small gradient. A first gradient surface 5b extending upward and a hypothetical extension extending downward from the inner surface 4b of the side wall 4 with a gradient of the side wall 4 from the tangent line between the upper surface 5a and the first gradient surface 5b toward the outer side in the thickness direction. A lower surface 5d extending to the surface 5c, a second inclined surface 5e adjacent to the lower surface 5d, extending in the same direction as the gradient of the side wall 4 and extending downward from the outer surface 4a of the side wall 4, and both ends of the upper surface 5a It is a space surrounded by a first side surface 5f extending between both ends of the second gradient surface 5e and a second side surface 5g extending between both ends of the lower surface 5d and both ends of the first gradient surface 5b.
[0014]
The storage container 1 configured as described above is formed by a pair of male and female molds 6 that are partially opened and closed in the direction of the bottom surface 3 and the opening 2 shown in FIGS. 10 and 11. That is, it is formed by a male mold 6a for molding the inner surface of the storage container 1 and the outer surface of the opening flange 2a, and a female mold 6b for molding the outer surface of the storage container 1 and the inner surface of the opening flange 2a.
[0015]
Here, a process of forming the perforations 5 will be described. As shown in the figure, the perforations 5 a are formed by the above-described mold 6 so that the surfaces 5 a to 5 g surrounding the perforations 5 are formed. That is, as shown in the figure, the first gradient surface 5b, the lower surface 5d, and the second side surface 5g are molded by the male mold 6a, and the upper surface 5a, the second gradient surface, and the first side surface 5f are molded by the female mold 6b. Is. The virtual surface 5c is a contact surface between the male mold 6a and the female mold 6b, and the perforation 5 is a so-called push hole.
[0016]
As described above, since the storage container 1 can be formed by a pair of male and female molds 6, a slide mold for forming a perforation that has been conventionally used is not required, and the number of mold surfaces is reduced. be able to. Thereby, the manufacturing cost of the mold for molding the storage container 1 can be suppressed, and the time required for molding such as mold closing and mold opening can be shortened. As a result, the product cost of the storage container 1 can be reduced.
[0017]
Further, since the virtual surface 5c is set at the thickness center, both the upper surface and the lower surface are set uniformly and with the maximum width. As a result, the molding conditions are stabilized and the strength can be ensured. Further, although a slight burr is generated on the contact surface between the male mold 6a and the female mold 6b, since the contact surface is set at the thickness center of the side wall 4, The outer surface and inner surface do not generate burrs and look good.
[0018]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained. Since the storage container can be formed by only a pair of male and female molds, a slide mold for forming the perforations found in the prior art is not required, and the number of mold surfaces can be reduced. Thereby, the manufacturing cost of the mold for molding the storage container can be suppressed, and the time required for molding can be shortened. As a result, the product cost of the storage container can be reduced.
[0019]
In addition, a high-quality storage container can be provided.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a storage container according to the present invention.
FIG. 2 is a right side view of FIG.
3 is a plan view of FIG. 1. FIG.
4 is a bottom view of FIG. 1. FIG.
FIG. 5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view taken along the line CC of FIG. 3;
8 is an enlarged cross-sectional view of a portion D in FIG.
FIG. 9 is a partial enlarged cross-sectional view for explaining a main part.
FIG. 10 is a partial enlarged cross-sectional view showing a mold for molding the storage container of the present embodiment.
FIG. 11 is a partially enlarged cross-sectional view showing a mold for molding the storage container of the present embodiment.
FIG. 12 is a partially enlarged cross-sectional view for explaining a forming process.
FIG. 13 is a partially enlarged cross-sectional view for explaining a forming process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage container 2 Opening 3 Bottom surface 4 Side wall 5 Perforation 5a Upper surface 5b First gradient surface 5c Virtual surface 5d Lower surface 5e Second gradient surface 5f First side surface 5g Second side surface 5h Virtual surface

Claims (1)

In a storage container formed by plastic injection molding surrounded by a bottom surface and a bottom surface and a side wall that expands upward with a predetermined gradient from the periphery of the bottom surface, the side wall has a plurality of perforations, A perforation extends from the outer surface of the side wall, which is substantially the edge of the perforation, toward the inner side in the thickness direction of the side wall, and adjacent to the upper surface and in the same direction as the gradient of the side wall and with a small gradient above the inner surface of the side wall. A first inclined surface extending toward the outer side in the thickness direction from the inner surface of the side wall, which is a substantially lower edge of the perforation, and extending downward with a slope of the side wall from a tangent line between the upper surface and the first inclined surface. A lower surface extending to an imaginary surface, a second gradient surface that is adjacent to the lower surface and extends in the same direction as the gradient of the side wall and has a small gradient toward the lower side of the outer surface of the side wall, both ends of the upper surface, and the second A first side surface extending between the distribution surface across, Ri space der which is surrounded by a second side surface extending between the first inclined surface at both ends and the lower surface at both ends, the said virtual plane A storage container characterized by being set at the thickness center of the side wall .

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