Door lock assembly with electrical alarm

Details Door lock assembly with electrical alarm Door lock assembly with electrical alarm

1979-06-05

1982-11-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340665, G08B 1306

Patent

active

043608035

ABSTRACT:
A door lock assembly having an electrical alarm system includes a piezoelectric element located between the lock bolt of the door lock and the lock frame in order to emit a signal to energize the electrical alarm system when pressure is applied between the lock bolt and the frame.

REFERENCES:
patent: 2660632 (1953-11-01), Makishima
patent: 3587080 (1971-06-01), Hawkins
patent: 3604958 (1971-09-01), Palini
patent: 4176347 (1979-11-01), McIntyre

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