Portable map reading system

Details Portable map reading system Portable map reading system

1978-01-04

1979-08-21

Mancene, Louis G.

Card, picture, or sign exhibiting

Photographic transparency viewer, e.g., x-ray viewer

40902, G02B 2702

Patent

active

041648226

ABSTRACT:
A portable map-display system for auto, boat and airplane uses and the like includes a plurality of translucent maps and a compact light box proportioned for back-lighting one map at a time. To prevent unshielded glare from the light-box and to assure proper orientation of maps on the light-box a series circuit arrangement turns off the light circuit in the box when a map is not properly in place over the light-box. The series circuit arrangement includes a conductive strip asymmetrically disposed on each map and a pair of electrodes on the light-box adapted for resiliently receiving the conductive strip of a map between them to close the circuit and turn on the light.

REFERENCES:
patent: 1989803 (1935-02-01), Hoben
patent: 1997157 (1935-04-01), Tauchek
patent: 2567561 (1951-09-01), Hoffmann
patent: 3663921 (1972-05-01), Richard

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