Hermetically sealed magnetic disk cartridge

Details Hermetically sealed magnetic disk cartridge Hermetically sealed magnetic disk cartridge

1984-09-20

1987-01-13

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

In container

G11B 2302

Patent

active

046369040

ABSTRACT:
A magnetic disk cartridge has a plastic cartridge case which houses a magnetic disk. The magnetic disk is connected to a disk hub which projects through an opening in the bottom of the cartridge case. An upwardly extending tapered wall extends around the periphery of the opening, and a tapered plastic ring is attached to and encircles the disk hub. During non-use of the magnetic disk cartridge, a spring urges the disk hub downwardly so that the tapered plastic ring frictionally engages with the tapered wall with a wedging action to seal the clearance formed at the opening between the disk hub and the cartridge case. During use, the disk hub is displaced upwardly against the spring force to disengage the tapered plastic ring from the tapered wall and the disk hub is rotationally driven to rotate the magnetic disk.

REFERENCES:
patent: 3715739 (1973-02-01), Van Acker
patent: 4084200 (1978-04-01), Adair et al.
patent: 4320425 (1982-03-01), Hall
patent: 4490764 (1984-12-01), Butz

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