Tamperproof lock and method

Details Tamperproof lock and method Tamperproof lock and method

1976-02-04

1977-06-28

Gilliam, Paul R.

Locks

Operating mechanism

Key

70423, 70455, E05B 1714

Patent

active

040317307

ABSTRACT:
An apparatus is disclosed for preventing tampering with a locking mechanism, such as the conventional cylinder lock, which has a keyway therein and is normally rotatable when a key is in the keyway. A locking arm normally holds the locking mechanism to prevent rotation thereof even when the key or a foreign device is in the keyway. In order to release the locking arm and rotate the locking mechanism, access to the keyway is first blocked thereby prohibiting someone from attempting to pick the lock with a foreign device.

REFERENCES:
patent: 2179947 (1939-11-01), Miller
patent: 2491337 (1949-12-01), Segal
patent: 3267707 (1966-08-01), Adams

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