Cylinder lock with warning of entry and drilling attempts

Details Cylinder lock with warning of entry and drilling attempts Cylinder lock with warning of entry and drilling attempts

1978-04-24

1981-04-21

Wolfe, Robert L.

Locks

Operating mechanism

Key

70441, 70DIG49, E05B 6300

Patent

active

042625068

ABSTRACT:
A device for detecting entry or drilling attempts into cylinder locks. One or more housing bores not corresponding to core bores when the lock is in a neutral position having spring biased tripping pins connected to an alarm or indicator system and operable when an entry attempt is made not using a proper key or after having drilled-out the tumbler or tumbler and cylinder pins. The tripping pins detect the rotated cylinder having a space in the cylinder bore due an improperly made key or due to the cylinder bore having previously been emptied by the drilling operation.

REFERENCES:
patent: 2838748 (1958-06-01), Torma
patent: 3181320 (1965-05-01), Bauer
patent: 3550410 (1970-12-01), Toepfer
patent: 3962695 (1976-06-01), Peters

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