Key reading system

Details Key reading system Key reading system

1982-02-26

1984-02-28

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

33174L, 70358, 70387, E05B 3504, G01B 728

Patent

active

044334877

ABSTRACT:
A key reading apparatus having a slot for receiving a key and at least one reading pin sensing depressions or raised projections on a key. The pin has a magnetic portion movable to two different positions, each of which positions place a Hall transistor at a different energy level. The key may have at least two rows of reading points. A clock line device distinguishes successive reading positions.

REFERENCES:
patent: 3264742 (1966-08-01), Roland
patent: 3640107 (1972-02-01), Litvin
patent: 3824818 (1974-07-01), Neale
patent: 3877267 (1975-04-01), Harris, Jr.
patent: 4007615 (1977-02-01), Nossum
patent: 4017978 (1977-04-01), Peruchon et al.
patent: 4283859 (1981-08-01), Roland

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