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US 4,371,131 AGranted
Magnetic tape cassette
AssigneeTDK Electronics Co., Ltd.
InventorsMasatohsi Okamura, Kimio Tanaka
Life of this patent
Estimating the term…
Abstract
A magnetic tape cassette having one or more guide pole which is forcibly inserted at each end into each axial hole formed in a casing comprises an air releasing portion for releasing air during the forcible insertion of said guide pole in said axial hole.
Claims1
A magnetic tape cassette comprising:
- a cassette casing defining at least one internal boss, each said boss having a recess defining recess walls;
- a tape guide pole forcibly insertable into each said recess;
- and
- means for releasing air during the forcible insertion of each said pole in each said recess, said means for releasing including a circular cross section for at least the portion of each said pole which is insertable in said recess, and a polygonal cross section for at least a portion of said walls of each said recess,
- wherein the flat surfaces of said walls of each said polygonally shaped recess forcibly grip each said pole and the intersections of said flat surfaces permit air to escape.
2 more elements
Dependencies are inferred from the claim text.