Door latch alarm

Details Door latch alarm Door latch alarm

1988-12-27

1990-03-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6167, 200 6193, G08B 1306

Patent

active

049124560

ABSTRACT:
A housing is positionable within a door frame and includes an upper and lower compartment. The lower compartment includes a conventional dead-bolt latch with a secondary bolt operative by means of an associated handle. The secondary bolt includes an upwardly depending switch extending from the first compartment housing the dead-bolt and secondary bolt into the overlying second compartment housing circuitry operative to actuate an audible alarm response to the switch upon repositioning of the secondary bolt from an extended to a retracted position.

REFERENCES:
patent: 3866203 (1975-02-01), Berns
patent: 4376276 (1983-03-01), Barta
patent: 4465997 (1984-08-01), Hines
patent: 4531029 (1985-07-01), Trimble
patent: 4538139 (1985-08-01), Clemente
patent: 4556765 (1985-12-01), Shaw et al.
patent: 4575713 (1986-03-01), Piper
patent: 4587517 (1986-05-01), Engstrom et al.
patent: 4596203 (1986-06-01), Lorek
patent: 4604609 (1986-08-01), Wakefield, Jr.

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