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US 5,177,656 AGranted
Flexible magnetic disc cassettes with integrally molded wear button
AssigneeHoechst Celanese Corporation
InventorPatrick M. Hughes
Life of this patent
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AssigneeHoechst Celanese Corporation
InventorPatrick M. Hughes
Estimating the term…
A cassette case for rotatably accommodating a flexible magnetic disc includes joined upper and lower cassette case halves. At least the upper cassette case half (and preferably both cassette halves) is formed of a molded plastics material, preferably an oxymethylene polymer. A wear button which is centrally located with respect to, and projects outwardly from, an interior surface of the upper cassette half, includes an integrally molded wear button. The wear button provides a low friction surface against which a drive spindle of a magnetic recording/reproducing apparatus bears when the cassette case (and its associated flexible magnetic disc) are placed into service. The wear button is most preferably in the form of a smooth convexly arcuate surface so as to minimize the contact area with the drive spindle, which thereby further contributes to its low friction characteristics.
A molded cassette case for a flexible magnetic disc, comprising:
A cassette case which accommodates a flexible magnetic disc for rotational movement comprising upper and lower cassette case halves, wherein said upper cassette case half is formed of a molded plastics material and includes (i) an centering ring which prevents lateral slippage of said magnetic disc within said cassette case, and (ii) a wear button integrally molded with said upper cassette case half, said wear button being centrally located with respect to said centering ring and projecting from an interior surface of said upper cassette case half toward said magnetic disc, said wear button providing low friction means against which a drive spindle for rotating said flexible magnetic disc bears.
A flexible magnetic disc cassette having a cassette case formed of a molded plastics material and a flexible magnetic disc accommodated within said cassette case for rotational movement, said cassette adapted to being operated within a magnetic recording/reproducing apparatus of the type having a motor-driven spindle which coacts with the magnetic disc to rotate the same within the cassette case, wherein said cassette case includes (i) a centering ring which prevents lateral slippage of said magnetic disc within said cassette case, and (ii) a wear button disposed centrally with respect to said centering ring and being integrally molded of the same plastics material as said cassette case, said wear button being in opposition to the motor-driven spindle to provide a surface against which said spindle bears during rotation of said flexible magnetic disc.
Dependencies are inferred from the claim text.