Conductive frangible grill anti-intrusion device

Details Conductive frangible grill anti-intrusion device Conductive frangible grill anti-intrusion device

1985-12-06

1989-03-07

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

49 50, 52106, 52456, 200 6108, 200 6193, 200DIG12, 340541, G08B 1308

Patent

active

048109991

ABSTRACT:
An electrically conductive anti-intrusion device characterized by a free-standing grill of brittle frangible rods cantilevered across an opening to be protected, with a breakable electrical conductor within the rods, the rods and conductor being sufficiently fragile to snap upon an attempt to dislodge the grill, thereby generating an alarm.

REFERENCES:
patent: 1578980 (1926-03-01), Gasser
patent: 2043207 (1936-06-01), Bayley et al.
patent: 2101040 (1937-12-01), Bayley et al.
patent: 2374139 (1945-04-01), Schriner
patent: 3051935 (1962-08-01), Wilson
patent: 3474587 (1969-10-01), Martin
patent: 3725891 (1973-04-01), Miller
patent: 3936621 (1976-02-01), Palin et al.
patent: 4232310 (1980-11-01), Wilson
patent: 4399430 (1983-08-01), Kitchen
patent: 4586030 (1986-04-01), Klostermann
patent: 4652472 (1987-03-01), Davies

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