Molded magnetic tape cassette case having improved gate mark loc

Details Molded magnetic tape cassette case having improved gate mark loc Molded magnetic tape cassette case having improved gate mark loc

1985-09-30

1987-03-03

Price, William

Special receptacle or package

For holding a machine readable recording medium

For holding a tape cassette

206444, 26432812, 2643289, B65D 85672

Patent

active

046469168

ABSTRACT:
In a case for holding a magnetic tape cassette comprising a lid and an inner enclosure formed of a planar bottom wall portion having a pair of spool stops projecting inwardly from its inner side and edge walls formed along the periphery of the bottom portion excepting a part of it and extending perpendicularly to that portion, one of the edge walls being formed with a thumb recess, the inner enclosure is made by a mold with a gate inlet so that the bottom portion has a gate mark on its outer side at a point where that portion meets the edge wall formed with the thumb recess, at a right angle to it, and underneath the recess. The planar bottom portion and peripheral edge walls are molded together in one piece. The gate mark is located at the point on an extension of a line intersecting the midpoint of a straight line that connects the two spool stops, on the outer side of the planar bottom portion, and extending at right angles to the straight line.

REFERENCES:
patent: 3620361 (1971-11-01), Fugiwara
patent: 4162047 (1979-07-01), Hashimoto
patent: 4431237 (1984-02-01), Saito et al.
patent: 4438860 (1984-03-01), Okamura et al.
patent: 4527690 (1985-07-01), Schmidts et al.
Injection Molding: Theory and Practice, by Irvin Rubin, 6/1973, pp. 124-126.

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