JPS6117595Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape cassette storage case, and more particularly to the side wall structure of the case body.

The magnetic tape cassette storage case is composed of two parts: a case body A and a lid B as shown in FIG.

The case body A, which is one part, is made of a transparent plastic molded product, and is composed of a fixed bottom 1 and side walls 2, 3, and 4 standing up from three sides of the fixed bottom 1. The fixed bottom 1 has two protrusions 5 and 6 that engage with the center hole of the winding frame of a magnetic tape cassette (not shown).
are integrally formed, and pivot pins 7 and 8 are integrally provided on the inner surfaces of both side walls 2 and 4, and pivot pins 7 and 8 are integrally provided on the outer surfaces of each side wall 2, 3 and 4 as shown in FIG. , A striped pattern 9 running in the vertical direction is formed to improve the design.

The other part, the lid B, is made of a transparent plastic molded product, and includes a lid 10 and a side wall 1.
1, 12, 13, and a bottom part 14,
Moreover, the pivot pins 7 and 8 are provided on both side walls 11 and 13.
Pivot holes 15 and 16 are formed to fit with the two.
Note that although the lid body B has been described here as being made of a transparent material, it is not limited thereto, and may be formed of an opaque material.

The case main body A and the lid B configured in this manner are rotatably assembled by fitting into the pivot pins 7 and 8 and the pivot holes 15 and 16, thereby forming a storage case. be done.

However, when molding the case body A, a side outer mold for forming the outer surfaces of the side walls 2, 3, and 4 and a bottom outer mold for forming the outer surface of the fixed bottom 1 are required. Injecting a plastic material into a molding mold consisting of an inner mold consisting of a plurality of divided pieces arranged at predetermined intervals so as to form a molding space with respect to the outer mold, After this material has cooled and solidified, first the central split piece of the inner mold is pulled upwards, and then each split piece is pulled inward to form the fixed bottom 1 and the inner surface of each side wall 2, 3, 4. At the same time, the bottom outer mold was removed from below, and the molded case body attached to the side outer mold was pushed down.

However, in the conventional main body case A shown in FIGS. 1 and 2, as described above, the uneven pattern 9 is formed on the outer surface of the side walls 2, 3, and 4. The case body can be pushed down from the side outer mold, that is, an uneven pattern extending parallel to the pushing direction, for example, a striped pattern 9 running in the vertical direction as shown in the figure.
The problem was that the design margin was narrow.

In addition, if there is such an uneven pattern on the outer surface of the side wall, it will be difficult to release the case body after molding when it is pushed out of the side outer mold, prolonging the cooling and solidifying time during molding, and making it difficult to fully form the case body. Since it cannot be pushed off until it has been shrunk, not only does the molding time become longer, but even after it has shrunk sufficiently, it may still be strongly attached to the side outer mold, and when pushed off, the case body may be damaged. Cracks, etc. occur in the product, resulting in poor product yield. Another disadvantage is that when the outer surface of the side wall has an uneven pattern, it tends to get dirty when the case is handled by hand, and the dirt is also noticeable.

Furthermore, the conventional storage case has inner surfaces of both side walls 2 and 4 of the case body A, and both side walls 11 of the lid body B,
Both the outer surfaces of 13 are flat with no unevenness, and by rotating the lid B, the side wall 2 and the side wall 11 are
The side wall 4 and the side wall 13 are in sliding contact with each other in surface contact. Therefore, the surface of each side wall 2, 4, 11, 13 is easily scratched due to sliding contact, especially the side wall 2,
4 is transparent, and when the lid body B is open, the side wall 1
1 and 13 do not overlap with the side walls 2 and 4 and are exposed to the outside, so scratches are noticeable no matter what state the lid B is in, reducing the product value.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to allow any pattern to be selected as the uneven pattern to be formed on the side wall of the transparent case body, to eliminate cracks during molding, and to shorten the molding time.
To provide a magnetic tape cassette storage case with high product value in which scratches on the side wall of the case body and the side wall of the lid body due to rotation of the lid body are not noticeable.

In order to achieve this object, the present invention is characterized in that the outer surface of the side wall of the transparent case body is formed into a planar shape without unevenness, and the inner surface of the side wall is formed with a pattern of unevenness.

Note that transparent here means that the uneven pattern formed on the inner surface of the side wall can be seen through from the outside of the case, and it goes without saying that it also includes colored transparent and semi-transparent.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, the magnetic tape cassette storage case consists of two parts: a transparent case body A and a lid B. The case body A has a fixed bottom 1, side walls 2,
3, 4 projections 5, 6 and pivot pins 7, 8, the lid body B also connects to the lid 10, side walls 11, 12, 1
3, a bottom portion 14, and a pivot hole 15, respectively, which are similar to the conventional example, but in this example, conventionally formed on the outer surface of each side wall 2, 3, 4 of the case body A. As shown in FIG. 3, the striped pattern 9 running in the vertical direction is formed on the inner surface of each side wall 2, 3, 4, and the outer surface of each side wall is formed into a planar shape without unevenness.

Therefore, the uneven pattern formed on the side wall has nothing to do with pushing the case body after molding out of the side outer mold, and the divided parts of the inner mold that are in contact with the inner surface of the side wall on which the uneven pattern is formed are Since it is removed after being moved to one side, any uneven pattern will not interfere with removal. Therefore, as the uneven pattern formed on the side wall, it is possible to select not only the above-mentioned striped pattern 9 but also any pattern such as a wavy pattern, which was previously impossible.

In addition, since the outer surface of the side wall is formed in a flat shape with no irregularities, the case body can be easily released from the side outer mold during molding, and the case body can be easily pushed out without sufficiently shrinking. ,
The cooling solidification time is short, the molding time can be shortened, and cracks and the like do not occur.

Furthermore, since the concave-convex pattern is formed on the inner surface of the side wall, it is difficult for the case to get dirty even when it is handled by hand, and even if it gets dirty, it is less noticeable.

Furthermore, the formation of the uneven pattern reduces the number of scratches on both side walls of the lid body, and almost no scratches occur on both side walls of the case body.

As explained above, according to the present invention, since the uneven pattern provided on the side wall of the transparent case body is formed on the inner surface of the side wall, it is possible to select any pattern as the uneven pattern, and the design of the storage case is improved. can increase the margin of In addition, the molding time of the case body can be shortened, and the yield rate can be improved by preventing cracks, etc., so the product can be provided at a lower price. Furthermore, it is possible to prevent the concave-convex pattern part of the case body from getting dirty. In addition, scratches on the side wall due to rotation of the lid are not noticeable, thereby preventing a decrease in product value.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional storage case, Fig. 2 is an enlarged sectional view of the main part of the case body shown in Fig. 1, and Fig. 3 is an exploded perspective view of a conventional storage case.
It is an enlarged sectional view of the main part of the case body similar to the figure. A... Case body, B... Lid body, 2, 3, 4...
...Side wall, 9...Uneven pattern.

Claims (1)

[Scope of utility model registration request] The device includes a transparent case body and a lid rotatably supported inside both side walls of the case body, and when the lid rotates, both side walls of the case body and both side walls of the lid come into sliding contact. 1. A magnetic tape cassette storage case according to the present invention, wherein the outer surface of the side wall of the case body is formed into a planar shape without unevenness, and the inner surface of the side wall is formed with an uneven pattern.