Alarm apparatus for movable barrier members

Details Alarm apparatus for movable barrier members Alarm apparatus for movable barrier members

1978-05-18

1979-07-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6184, 200 6193, 340545, 340547, G08B 1308

Patent

active

041609727

ABSTRACT:
A normally-open magnetic reed switch is mounted on the bottom of a venetian blind or similar barrier and a magnet is mounted in the window sill to hold the switch closed when the barrier is in its normal position. When closed, the switch shorts a timing capacitor in an associated alarm circuit. If the switch moves away from the magnet (thus allowing the switch to open) long enough for the timing capacitor to charge, an alarm signal is produced. Thus an alarm will not be produced by trivial movements of the barrier.

REFERENCES:
patent: 1392641 (1921-10-01), Havran
patent: 2287382 (1942-06-01), Livingston
patent: 2293609 (1942-08-01), Livingston
patent: 3009138 (1961-11-01), Lindsay
patent: 3668582 (1972-06-01), Lea
patent: 3706090 (1972-12-01), Callaghan
patent: 3710369 (1973-01-01), Takahashi
patent: 3943485 (1976-03-01), Waldman

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