Tamper-resistant lock assembly

Details Tamper-resistant lock assembly Tamper-resistant lock assembly

1983-08-23

1985-01-01

Wolfe, Robert L.

Locks

Operating mechanism

Key

70401, 70409, 70427, E05B 1304, E05B 1718, E05B 1908

Patent

active

044909985

ABSTRACT:
A tamper-resistant lock assembly includes a pair of cooperating keyway guard plates, each of which has a keyway formed therethrough. The guard plates are laterally displaceable relative to one another for movement between an open position, in which the keyways thereof are substantially aligned to allow for passage of at least a portion of a key shank therethrough, and a closed position, in which the keyway of one of the guard plates is at least partially blocked by the other of the guard plates. A uniquely-configured key is also disclosed for use in combination with such guard plates.

REFERENCES:
patent: 477142 (1892-06-01), McKee
patent: 758025 (1904-04-01), Taylor
patent: 1702430 (1929-02-01), Fremon
patent: 3313134 (1967-04-01), Gahmberg
patent: 3512382 (1970-05-01), Check et al.
patent: 3578371 (1971-05-01), Keller
patent: 3779332 (1973-12-01), Snitgen
patent: 4031730 (1977-06-01), Kern
patent: 4325242 (1982-04-01), Tietz

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