Cover plate for a microform reader

Details Cover plate for a microform reader Cover plate for a microform reader

1977-09-08

1978-12-05

Aegerter, Richard E.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353 23, G03B 2308, G03B 148

Patent

active

041283198

ABSTRACT:
A cover plate for a microform reader. The reader includes a carrier for holding a microform, with the cover plate being pivotally mounted on the carrier for movement between open and closed positions. A spring interconnects the cover plate and the carrier and coacts with an inclined surface in the reader to progressively add energy to the spring as the carrier is moved to a first position from a second position to enable the spring to automatically lift the cover plate as the carrier is moved towards the first position to permit the removal and insertion of a microform in the carrier.

REFERENCES:
patent: 2353241 (1944-07-01), Hughey
patent: 3352201 (1967-11-01), Brownscombe
patent: 3413061 (1968-11-01), Simpson et al.
patent: 3424524 (1969-01-01), Akiyama et al.
patent: 3442581 (1969-05-01), Smitzer et al.
patent: 3733121 (1973-05-01), Smitzer
patent: 3743399 (1973-07-01), Smith
patent: 3836242 (1974-09-01), Kluver et al.
patent: 3837738 (1974-09-01), Kato et al.
patent: 4025175 (1977-05-01), Leibundgut et al.

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