Dynamic magnetic information storage or retrieval – Record medium – In container
Patent
1991-02-05
1993-01-05
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
In container
G11B 2303
Patent
active
051776561
ABSTRACT:
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.
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IBM/TDB vol. 24, No. 1A, Jun. '81, p. 216, "Flexible Disk Cartridge Arrangement" by Henderson.
IBM/TDB vol. 21, No. 10, Mar. 1979, pp. 4192-4194, "Cartridge . . . for a Magnetic Recording Disk" by Johnson et al.
Hoechst Celanese Corporation
Wolff John H.
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