JPH0126628Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a vacuum-formed container used for packing eggs, side dishes, etc.

[Background Art] Conventionally, as shown in FIG. 1, in this type of container, a top lid 2' having a recess 1' and a container body 4' having a recess 3' are vacuum-formed from a single synthetic resin sheet. It was folded in the center and stapled. However, with this structure, it was difficult to remove the staples when opening the bag, and there was a risk of damaging the contents if the bag was opened forcefully.

As a countermeasure, as shown in Fig. 2, the upper lid 2'
In some cases, the container body 4' is provided with an engaging protrusion 6' and an engaging recess 7', respectively, so that both parts 2' and 4' can be engaged without staples. However, this structure requires a bulging part A in the engaging uneven part, so it is necessary to cool the molded product once during molding and then use the elastic deformation of the molded product to cut the mold. This has the disadvantage that the cost is significantly higher than that without the engagement unevenness.
A die cutting device is a device in which a mold with a small diameter protrusion that causes large friction during die cutting is formed so that it can be moved in and out, and the protrusion of this mold is inserted into the die after cooling and before die cutting. This is necessary when there are uneven parts or bulging parts on the circumferential surface.

[Purpose of the invention] The present invention was devised in view of the above points, and its purpose is to eliminate the need for a bulging portion in the engaging uneven portion, thereby eliminating the need for cooling during molding. To provide a structure of a vacuum-formed container that allows high-speed molding by natural falling.

[Disclosure of the invention] The container according to the invention has an oval recessed groove portion having a thick peripheral wall and a bowl-shaped inner part having a thinner wall;
The main feature of the container body and the top lid are that the container body and the top lid can be engaged with each other by fitting into a protrusion having a thick tapered portion at the tip of a thin-walled cylindrical portion having a diameter larger than the short diameter of the recessed groove portion. This makes it possible to engage the protrusion and the recessed groove without forming a bulging portion.

The present invention will be explained in detail below based on the embodiment of the egg container shown in FIGS. 3 to 9. A storage section for eggs E is formed by a lower recess 3 provided in the container body 4 and an upper recess 1 provided in the upper lid 2.
The pivot portion 5 connecting the top cover 2 and the top cover 2 is constituted by a band-shaped portion 8 and upper and lower bent portions 8a and 8b formed at its upper and lower edges. The engaging uneven portion includes a groove portion 7 formed on the stepped portion 11 of the container body 4, and a groove portion 7 formed on the stepped portion 11 of the container body 4.
The protrusion 6 is formed on the protrusion 9 of the protrusion 9. By providing thickness to the pivot and the entire container, it is possible to protect the contents from the twisting force shown by the arrow in Figure 1, and also to prevent fingers from being inserted between the container body and the top lid. A gap f is provided to facilitate opening and closing. Note that 14 and 15 are fitting projections and depressions formed in the center of the container.

To explain the engagement unevenness in more detail, the groove 7 has an oval opening and a thick peripheral wall 13.
In addition, the protrusion 6 has a diameter d larger than the short axis l of the groove 7, and a thick cylindrical portion 10 at the tip of the thin cylindrical portion 10. A tapered part of the meat is formed. The feature of this configuration is as shown in FIG. 7a, the protrusion 6
In both the concave and groove portions 7, there is no bulging part that is seen in normal concave-convex engagement, and this makes it possible to remove the mold by natural falling during molding, and after cooling it as in the conventional method. This eliminates the need for die cutting using elastic deformation.

In use, as shown in FIG. 7b, when the protrusion 6 is press-fitted into the groove 7, the tapered portion at the tip of the cylindrical portion 10 is first elastically deformed and fitted into the groove, as shown in the figure. When it reaches this position, the thin inner part 12 of the groove 7 is pressed by the thick tapered part and is elastically deformed, so that the tip of the protrusion 6 bulges out in the width direction of the groove 7 more than the base. Therefore, it is locked in the groove.

The engagement unevenness according to the present invention is characterized in that the cylindrical protrusion 6 having the thick conical tip is fitted into the groove 7 having the thick oval opening as described above. By elastically deforming the oval opening, the conical tip of the protrusion 6 can be inserted. That is, the protrusion 6 and the groove 7
If the thick parts of the protrusion 6 are all circular, it will be difficult to fit them in due to elastic deformation, and as shown in FIG. It is also possible to insert the mold by providing unevenness for the purpose, but in this case, the friction between the inner circumferential surface of the protrusion 6 and the mold increases, so the above-mentioned mold cutting device is indispensable. have a problem
The present invention solves these problems by making the shape of the opening of the groove 7 oblong.

[Effects of the invention] As described above, the vacuum-formed container of the present invention has an oval groove with a thick peripheral wall and a thinner bowl-shaped inner part, and a diameter larger than the short axis of the groove. In addition, it has a unique structure in which the container body and the top lid are engaged by fitting a protrusion having a thick tapered portion at the tip of a thin cylindrical portion, so a stapler or the like is not required. Although the engagement can be engaged without any problem, there is no bulging part on the engaging uneven part, and the mold can be removed by falling naturally during molding, and there is no need for a mold cutting device. It has the advantage that high-speed molding is possible because there is no need to cool it once.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is a sectional view of another conventional example, Fig. 3 is a perspective view of an embodiment of the present invention, Fig. 4 is a sectional view taken along line XX in Fig. 3; Figures 5 and 6
The figure is a side view of the same as the above, FIG. 7 a is a cross-sectional view of the main part of the same, b is a cross-sectional view showing the engaged state, FIG. 8 is a top view of the main part of the same, and FIG. 9 is a perspective view of the main part of the same. 10 are cross-sectional views for explaining the operation of the present invention. 2 is the upper lid, 4 is the container body, 6 is the protrusion, 7 is the groove, 10 is the thin cylindrical part, 12 is the inner part of the thin wall,
13 is a thick peripheral wall.

Claims (1)

[Scope of utility model registration request] It has an oval groove with a thick peripheral wall and a thinner bowl-shaped inner part, and a thick tapered part at the tip of the thin-walled cylindrical part, which has a diameter larger than the short axis of the groove. A vacuum-formed container in which a container body and a top lid can be freely attached to each other by fitting with a protrusion.