Burglar alarm system

Details Burglar alarm system Burglar alarm system

1978-07-05

1979-12-11

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6162, 292346, 340550, G08B 1306, H01H 2700

Patent

active

041785886

ABSTRACT:
A burglar alarm system is mounted in a doorway framing which comprises a reinforcement metal plate extending over a substantial portion of the wall studs and a substantial portion of one minor face of the door jamb, which plate is securely affixed to the wall stud and the minor door jamb face to cover a substantial region of the minor door jamb face adjacent and beyond the door latch bolt hole in the side rail. The alarm system comprises a pair of elongated copper sheets insulated from the metal plate and arranged between the plate and the minor door jamb face. The copper sheets extend side-by-side along a major portion of the reinforcement plate and are insulated from each other. The copper sheets are connected to an electric control circuit energizable to set off a burglar alarm and energized upon electrical contact being made by the sheets through a metal burglar tool used in an attempt to jimmy the door.

REFERENCES:
patent: 2615083 (1952-10-01), Krueger
patent: 3295124 (1966-12-01), Burleson et al.
patent: 3978467 (1976-08-01), Albert
patent: 4010968 (1977-03-01), Rehfeld
patent: 4029919 (1977-06-01), Lunne

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