Structure of combined lock device

Details Structure of combined lock device Structure of combined lock device

1991-04-26

1992-01-07

Gall, Lloyd A.

Locks

Operating mechanism

Combination and key

70156, 70333A, 70423, 70455, 292346, E05B 1718, E05B 3700

Patent

active

050779966

ABSTRACT:
A combined lock device comprised of a key lock linked up with at least one combination lock. The key lock can be unlocked by a key only when the combination lock is unlocked. A division plate is mounted on the lock device to alternatively conceal the key lock and the at least one combination lock, so as to prohibit the key lock and the at least one combination lock from being simultaneously exposed to thieves' eyes. The lock bolt which is driven by the key to fasten a door, strongbox, etc. has a notch on the slope of the front end thereof to protect against insertion of a pry.

REFERENCES:
patent: 714458 (1902-11-01), Dalton et al.
patent: 845019 (1907-02-01), Voight
patent: 1437561 (1922-12-01), Shively
patent: 2834195 (1958-05-01), Stackhouse
patent: 3948550 (1976-04-01), Vigluicci et al.
patent: 4354367 (1982-10-01), Wahl
patent: 4793165 (1988-12-01), Rochman

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