Cursor for use in microfilm reader

Details Cursor for use in microfilm reader Cursor for use in microfilm reader

1977-09-26

1979-07-03

Stephan, Steven L.

Optics: image projectors

Miscellaneous

33437, G03B 2100, B43L 1304

Patent

active

041598695

ABSTRACT:
A microfilm reader includes a vertical rectangular projection screen surrounded by a rectangular frame. A cursor mechanism is separably provided which includes a vertical rail extending along a side edge of the screen between the frame top and bottom legs and slidably frictionally engaging a support member to which a cursor member is swingably mounted for angular adjustment in a plane parallel to the screen. The cursor member is releasably frictionally retained in its preset angular position and the support member is releasably frictionally retained in its preset vertical position. Cam means including a rotatable or slidable knob angularly adjusts the cursor member or the cursor member is directly turned by a knob attached to a pivot secured to the cursor member. The rail may be replaced by a side wall of the reader which is formed of magnetic material and the support member may carry a permanent magnet slidably securing it to the side wall.

REFERENCES:
patent: 71178 (1867-11-01), Imbach
patent: 456553 (1891-07-01), Carr
patent: 695565 (1902-03-01), Knapp
patent: 1115333 (1914-10-01), Pease
patent: 1459792 (1923-06-01), Nilant
patent: 2848923 (1958-08-01), Diefenbach
patent: 3882603 (1975-05-01), Distel
patent: 4102050 (1978-07-01), Roth

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