Erasure preventing thumbwheel for single reel cartridges

Details Erasure preventing thumbwheel for single reel cartridges Erasure preventing thumbwheel for single reel cartridges

1992-08-21

1997-12-16

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record medium

In container

360 60, G11B 1504

Patent

active

056992165

ABSTRACT:
An erasure preventing thumbwheel is located in the front wall of a cartridge and is rotatable in an opening in the front wall. The thumbwheel has a larger diameter central portion which is exposed through the opening and includes a flat section which corresponds in size and shape to the opening. When the flat section registers with the opening, the tape is write-protected. The thumbwheel has a circumferential ridged gripping portion at one edge of the central portion which extends around the non-flat cylindrical section of the thumbwheel. The gripping portion does not extend along the edge of the flat section.

REFERENCES:
patent: 4012011 (1977-03-01), Saito
patent: 4320421 (1982-03-01), Larson et al.
patent: 5209424 (1993-05-01), Fischer et al.
Research Disclosure 25038, "File Protect Detent and Sleeve".

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