High-security flat key and lock therefor

Details High-security flat key and lock therefor High-security flat key and lock therefor

1989-03-24

1990-12-18

Gall, Lloyd A.

Locks

Operating mechanism

Key

70409, 70495, E05B 1906

Patent

active

049777670

ABSTRACT:
A flat key has a blade formed with bitting along at least one of its edges, with a pair of relatively shallow, outwardly open, and generally parallel but spaced grooves formed in at least one of its faces extending generally longitudinally in a nonstraight path from the tip, and with a relatively deep and outwardly open groove formed in the one face and extending generally longitudinally in a nonstraight path from the tip generally nonparallel to the shallow grooves. This key is used with a lock that has a relatively stationary lock housing containing a rotatable lock cylinder formed with an axially outwardly open flat passage shaped to snugly receive the key blade, and independent first and second slides displaceable in the cylinder generally of the axis and parallel to the one face of a key in the passage and provided with respective long and short formations engageable generally radially of the axis with the deep and shallow grooves. Thus the slides are shifted on insertion of the key by interengagement of the formations and the respective grooves. A lock element is displaceable in only one predetermined position of the slides between a position blocking rotation of the cylinder in the housing and a position permitting such rotation.

REFERENCES:
patent: 2039126 (1936-04-01), Svoboda
patent: 2157142 (1939-05-01), Olson
patent: 3035433 (1962-05-01), Testa
patent: 3137156 (1964-06-01), Navarro
patent: 3264852 (1966-08-01), Gysin
patent: 4270372 (1981-06-01), Vonlanthen et al.
patent: 4516416 (1985-05-01), Prunbauer et al.
patent: 4860562 (1989-08-01), Koren et al.

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