Geometrical instruments – Gauge – Lock or key
Patent
1992-01-29
1992-09-15
Haroian, Harry N.
Geometrical instruments
Gauge
Lock or key
G01B 1124, G01D 532
Patent
active
051466899
ABSTRACT:
A method and apparatus for reading a key to determine the depth of its notches. A frame is moveable towards and away from the key, this frame having a reading pin and a plurality of contact pins thereon, all of those pins being spring biased towards the key and moveable against the spring, away from the key. A reader body is fixed on the reading pin and has a plurality of recesses, one recess associated with each contact pin, each recess being of a different depth. Once the reading pin engages a key notch, the contact pins continue to move a certain distance. The depth of the notch is dependent on the number of contact pins which have engaged the bottoms of their respective recesses on the reader body. Each such contact closes an electrical connection so that the depth of the notch is dependent on the number of contact pins which have contacted the bottoms of their respective recesses.
REFERENCES:
patent: 3264742 (1966-08-01), Roland
patent: 3496636 (1970-02-01), Lieptz
patent: 3735496 (1973-05-01), Lee
patent: 3831282 (1974-08-01), Falk
patent: 3919920 (1975-11-01), Schlage
patent: 4012991 (1977-03-01), Uyeda
patent: 4090303 (1978-05-01), Uyeda
patent: 4433487 (1984-02-01), Roland
patent: 4516327 (1985-05-01), Kanda et al.
patent: 4526498 (1985-07-01), Fieldhouse
Haroian Harry N.
Maromatic Company, Inc.
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