JPH10194259A - Container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a container with holes by only a pair of male and female metal molds without use of a slide metal mold for the holes and reduce the number of the Planes of the metal mold, by forming the inside and outside faces of the side wall connected to respective holes at a specified inclined face, in the container provided with a number of holes on the side wall. SOLUTION: This container 1 provided with an opening 2 at the upper face and side walls 4 widened upward at a specified inclination from the bottom face 3. An opening flange 2a bent outward and further bent downward is formed at the whole peripheral edge of the opening 2. A plurality of through holes 5 are formed on the side walls 4. Respective holes 5 are provided with the first inclined face 5b extending toward the upper part or the inside face 4b of the side walls 4 in the same direction with the inclination of the side walls 4 and with a little inclination and the second inclined face 5e extending toward the lower part of the external face 4a of the side walls 4 in the same direction with the inclination of the side walls 4 and with a little inclination. In this way, the holes 5 can be formed by a pair of male and female metal molds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is formed by plastic injection molding which is surrounded by a top surface which is open, and which is surrounded by a bottom surface and a side wall which expands upward at a predetermined gradient from the periphery of the bottom surface, and has a plurality of perforations in the side wall. It relates to a storage container.

[0002]

2. Description of the Related Art Conventionally, there are various storage containers formed by plastic injection molding, which are surrounded by a bottom surface and a side wall which expands upward at a predetermined gradient from the periphery of the bottom surface and which has a plurality of perforations in the side wall. Exists.

Here, the above-mentioned storage container is generally formed by using a pair of dies that open and close in the bottom and opening directions, and a slide die that slides in the direction of the side wall for forming a hole. Met.

[0004]

However, as described above, since a slide die for forming a perforation is required, the cost of the die is increased, and the time for molding is increased. As a result, the cost of the product has increased.

The present invention has been made in view of the above circumstances, and has as its object to provide an inexpensive storage container.

[0006]

According to a first aspect of the present invention, there is provided a storage container having an opening at an upper surface, a bottom surface and a side wall extending upward from a periphery of the bottom surface with a predetermined gradient. In the enclosed container formed by plastic injection molding, the side wall has a plurality of perforations, and the perforations extend inward in the thickness direction of the side wall from an outer surface of the side wall which is a substantially upper edge of the perforation. An upper surface, a first sloping surface adjacent to the upper surface and extending in the same direction as the inclination of the side wall and with a small gradient toward the inner surface of the side wall, and a thickness from the inner surface of the side wall substantially serving as a lower edge of the perforation. A lower surface extending outwardly in a direction from a tangent between the upper surface and the first inclined surface to an imaginary surface extending downward with a gradient of the side wall, and a lower surface adjacent to the lower surface in the same direction as the gradient of the side wall; A second sloping surface extending downwardly toward the outer surface of the side wall, a first side surface extending between both ends of the upper surface and both ends of the second sloping surface, both ends of the lower surface, and both ends of the first sloping surface And a space surrounded by the second side surface extending between the first and second sides.

[0007] With the above structure, the upper surface, the second inclined surface, and the first side surface can be molded by a male mold, and the lower surface, the first inclined surface, and the second side surface can be molded by the male mold, 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 and opening directions.

The storage container according to the second invention is characterized in that the virtual surface is set at the center of the thickness of the side wall.

With the above configuration, the upper surface and the lower surface can be set uniformly and with the maximum width.

[0010]

Embodiments of the present invention will be described below.

FIG. 1 is a front view showing a storage container 1 of this embodiment, and FIGS. 2 to 4 are a right side view, a plan view, and a bottom view, respectively. 5 and FIG. 6 are lines AA and B in FIG.
FIG. 7 is a sectional view taken along line B-B, and FIG. 7 is a sectional view taken along line CC of FIG. The storage container 1 is integrally formed by plastic injection molding as a whole.

The storage container 1 has an opening 2 on the top surface and a bottom surface 3
Is a container provided with an internal space surrounded by a side wall 4 that expands at a predetermined gradient upward from the periphery of the container.
At the edge of the opening 2 of the storage container 1, an opening flange 2a which is bent outward and further bent downward is formed over the entire circumference.

The side wall 4 is formed with a plurality of perforations 5 penetrating inside and outside 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 inside 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 inclined surface 5b extending upward, and an inner surface 4 of the side wall 4
b and the first sloped surface 5
a lower surface 5d extending downward from the tangent line to the imaginary surface 5c with a gradient of the side wall 4 and a side wall 4 adjacent to the lower surface 5d in the same direction as the gradient of the side wall 4 and with a small gradient.
A second inclined surface 5e extending downwardly of the outer surface 4a of the first member, and a first inclined surface 5e extending between both ends of the upper surface 5a and both ends of the second inclined surface 5e.
This is a space surrounded by the side surface 5f and the second side surface 5g extending between both ends of the lower surface 5d and both ends of the first inclined surface 5b.

The storage container 1 constructed as described above is formed by a pair of male and female dies 6 which are partially opened and closed in the direction of the bottom surface 3 and the opening 2, partially shown in FIGS. That is, the inner surface of the storage container 1 and 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.

Here, the process of forming the perforations 5 will be described. As shown in the figure, the perforations 5a are formed by molding the respective surfaces 5a to 5g surrounding the perforations 5 with the mold 6 described above. That is, as shown in FIG.
The lower surface 5d and the second side surface 5g are molded by the male mold 6a, and the upper surface 5a, the second inclined surface, and the first side surface 5f are molded by the female mold 6b. 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-cut hole.

As described above, since the storage container 1 can be formed by a pair of male and female molds 6, the conventional slide mold for forming perforations is not required, and the number of mold surfaces is reduced. Can be reduced. Thereby, the manufacturing cost of the mold for molding the storage container 1 can be reduced, and
The time required for molding such as closing and opening the mold can also be reduced. As a result, the product cost of the storage container 1 can be reduced.

Further, since the virtual surface 5c is set at the center of the thickness, both the upper surface and the lower surface are set to be uniform and have the maximum width. As a result, the molding conditions are stabilized and the strength can be secured. Then, burrs are generated on the contact surface between the male mold 6a and the female mold 6b, though very slightly.
Since the contact surface is set at the center of the thickness of the side wall 4,
Burrs do not occur on the outer surface and the inner surface of the side wall 4 and the appearance is good.

[0018]

According to the present invention, as described in detail above, the following effects can be obtained. Since the storage container can be formed only by a pair of male and female molds, there is no need for a slide mold for forming perforations, which has been conventionally seen,
The number of mold surfaces can be reduced. Thereby, the manufacturing cost of the mold for molding the storage container can be reduced, and the time required for molding can be shortened.
As a result, the product cost of the storage container can be reduced.

Further, 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 of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a bottom view of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 1;

FIG. 6 is a sectional view taken along line BB of FIG. 1;

FIG. 7 is a sectional view taken along line CC of FIG. 3;

FIG. 8 is an enlarged sectional view of a portion D in FIG. 7;

FIG. 9 is a partially enlarged cross-sectional view for explaining main parts.

FIG. 10 is a partially enlarged sectional view showing a mold for molding the storage container of the present embodiment.

FIG. 11 is a partially enlarged 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 1st slope surface 5c Virtual surface 5d Lower surface 5e 2nd slope surface 5f 1st side surface 5g 2nd side surface 5h virtual surface

Claims (2)

[Claims] 1. A storage container formed by plastic injection molding and surrounded by a bottom surface and a side wall that expands upward at a predetermined gradient from the periphery of the bottom surface and a periphery of the bottom surface, wherein the side wall has a plurality of perforations. A top surface extending from the outer surface of the side wall, which is a substantially upper edge of the perforation, to the inside in the thickness direction of the side wall, and having the same gradient as the slope of the side wall adjacent to the upper surface and having a small gradient. A first inclined surface extending upwardly on the inner surface of the side wall, and a gradient of the side wall from a tangent line between the upper surface and the first inclined surface from the inner surface of the side wall, which is a substantially lower edge of the perforation, to the outside in the thickness direction. A lower surface extending to a virtual surface extending downward with
A second inclined surface adjacent to the lower surface and extending downward in the same direction as the inclination of the side wall and with a small inclination toward the outer surface of the side wall, and a second inclined surface extending between both ends of the upper surface and both ends of the second inclined surface. A storage container characterized by being a space surrounded by one side surface and a second side surface extending between both ends of the lower surface and both ends of the first inclined surface. 2. The storage container according to claim 1, wherein the virtual surface is set at the center of the thickness of the side wall.