JPH0413145Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a plastic case for housing records, cassette tapes, typewriters, word processors, etc., which is strong and has an excellent surface appearance.

[Conventional technology]

Traditionally, it consists of a hollow double-walled body and a lid.
A plastic case in which groove-shaped ribs are formed on the inner wall of the bottom surface of the main body is shown in Japanese Utility Model Application Publication No. 149310/1983.

In the conventional example described above, the strength of the case itself is improved to some extent by forming groove-shaped ribs on the bottom inner wall of the main body, but when items are stored in the storage recess, the inner wall deforms toward the outer wall. Strength problems sometimes occurred. For this reason, it is possible to weld and integrate the inner and outer walls where the groove-shaped ribs are formed during blow molding, but when welding the inner and outer walls, the welding is done by compressing them from both sides with a molding die. , the surface of the outer wall part of the welded case, which is the outer side of the case, is likely to have molding defects. For example, the grain pattern engraved on the blow molding mold with a depth of about 0.04 to 0.4 mm is not reproduced on the outer wall of the case in that part, resulting in poor surface appearance. There were flaws that impaired the quality of the product.

[Purpose of invention]

The present invention was devised in view of the above, and provides a plastic case for storing records, cassette tapes, etc., which has excellent strength against drop impact, rigidity, etc., and has an excellent surface appearance on the outer surface of the case.

[Structure of the idea]

The present invention consists of a hollow double-walled main body and a lid, and is constructed by forming groove-shaped ribs that intersect on the bottom inner wall of the main body, and welding and integrating the inner and outer walls where the ribs intersect. Regarding the plastic case.

In the present invention, a plastic case is defined as a split mold made by extruding a plasticized parison of a thermoplastic such as polyethylene, polypropylene, polyamide, polyvinyl chloride, or ethylene-vinyl acetate copolymer, and having a convex cavity and a concave cavity. A plastic case made by closing the parison with a mold and blow-molding it.It is used for records, cassette tapes, typewriters, word processors, video cameras, measuring instruments, plastic sheets for overhead projectors, magnetic diskettes, and magnetic tapes. It is used as a case to store guitars, electronic musical instruments, etc.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 is a case for storing both records and cassette tapes; body 2 has a hollow double wall structure;
and a lid body 3. The main body 2 and the lid 3 are compressed using a time-divided blow molding mold and are connected to each other by a thinned hinge 4. a latch integrally connected to the lid body 3; 7, 7 a latch receiving protrusion protruding from the main body 2; 8 a handle integrally constructed with the main body 2;
9 is a storage recess. Further, a grain pattern of 0.04 to 0.4 mm is formed on the outer wall surface of the main body 2.
Groove-shaped ribs 12a, 12b, 12c are formed on the inner wall 2a of the main body 2 from the side surface 10 of the case 1, passing through the bottom surface 11 and extending to the opposing side surface 10', and intersect with the groove-shaped ribs 12a, 12b, 12c. Concave groove-shaped ribs 12d and 12 are provided from the side surface 10 of the case 1 to the opposite side surface 10' passing through the bottom surface 11.
e, 12f are formed. And the rib 12a,
The inner wall 2 and the outer wall 3 at the intersection of the ribs 12d and 12f perpendicular to the ribs 12c are welded together during blow molding by protruding the inner wall 2 further to the outer wall 3 side than the depth of the ribs, and form dot-shaped bearing parts ad, af, cd. , cf are formed, and similarly, the inner wall 2 and the outer wall 3 at the intersection of the rib 12b and the orthogonal rib 12e are welded and integrated to form a point-shaped support portion be.

When using plastic case 1,
After opening the lid 3 and storing the record, the lid 3 is closed and the latches 5, 5 are engaged with the latch receiving protrusions 7, 7, and the record can be carried using the handle 8. Further, in order to store the cassette tape, as shown in FIG. can be stored in. In addition, by fitting a partition member into any other part of the groove, it is possible to organize and store items having different external dimensions.

[Effect of idea]

As mentioned above, the plastic case of the present invention consists of a hollow double-walled main body and a lid, and groove-shaped ribs are formed to cross each other on the bottom inner wall of the main body, and the inner wall where the ribs intersect each other. Since the outer wall is welded and integrated with the outer wall, the inner wall will not be deformed due to the intersecting groove-like ribs even when stored items are stored in the storage recess, and the inner wall and outer wall will be able to withstand drops. Since it is integrally welded, the case does not deform and has excellent rigidity. In addition, since the welding and integration described above is performed at the intersections of the ribs, there is no molding defect on the surface of the outer wall portion of the welded case, which is the outer side of the case, unlike in the past, and a plastic case with a beautiful surface appearance can be obtained. be able to.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the plastic case according to the present invention, Fig. 2 is a top view showing the open state, Fig. 3 is a sectional view taken along line AA in Fig. 1, and Fig. 4 is a sectional view taken along line B - Fig. 1.
It is a sectional view of B. 1...Plastic case, 2...Main body, 3...
...Lid body, 2a...Inner wall, 2b...Outer wall, 12a,
12b, 12c, 12d, 12e, 12f... groove-shaped ribs.

Claims (1)

[Scope of utility model registration request] It consists of a main body and a lid with a hollow double wall structure, and is constructed by forming concave groove-shaped ribs that intersect on the bottom inner wall of the main body, and welding and integrating the inner wall and outer wall where the ribs intersect. Characteristic plastic case.