Tamper preventing lock

Details Tamper preventing lock Tamper preventing lock

1978-01-09

1980-02-05

Wolfe, Robert L.

Locks

Operating mechanism

Key

70431, 70441, E05B 1700

Patent

active

041865782

ABSTRACT:
A tamper preventing tumbler lock which provides an alarm signal or prevents lock activation when any electrically conductive object, such as a pick or the like, is inserted in the keyway. The lock includes a pair of electrically conductive tumblers which complete an electrical path to activate the alarm or to activate a solenoid operated latch to prevent rotation of the lock cylinder or actuate an associated lock bolt when the conductive tumblers are bridged by the conducting object in the keyway. The lock may be operated as a conventional tumbler lock by means of an electrically non-conductive key.

REFERENCES:
patent: 2057301 (1936-10-01), Golokow
patent: 2105304 (1938-01-01), Wagner
patent: 3392558 (1968-07-01), Hedin
patent: 3801755 (1974-04-01), Schlage

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