Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-06-30
1985-07-09
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340545, 340585, 340549, 49 13, G08B 2100
Patent
active
045285586
ABSTRACT:
A door-open alarm device comprises alarm means connected to an electric circuit which comprises, arranged on the stationary part (11), a voltage source, a switch (13) having two positions in which the circuit is interrupted and closed respectively, electrical time delay means responsive to a current flow in the circuit to produce a voltage variation across said alarm means after a time delay, thereby triggering said alarm means. Arranged on the door (12) is a mechanical actuating element (14) for said switch, which opens said switch when the door is wide open or closed, and which closes said switch when the door is ajar.
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patent: 3210748 (1965-10-01), Onuffer
patent: 3803576 (1974-04-01), Dobrzanski et al.
patent: 3955183 (1976-05-01), McBrian
patent: 3975723 (1976-08-01), Bowling et al.
patent: 4006451 (1977-02-01), Nobile
patent: 4249161 (1981-02-01), Mohnhaupt
patent: 4278968 (1981-07-01), Arnett et al.
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"Fridge Alarm", Elektor, vol. 6, pp. 11-34, 11-35, Nov. 1980.
Courdille Michel
Hazan Jean-Pierre
Steers Michel
Franzblau Bernard
Mayer Robert T.
Mullen Jr. Thomas J.
Rowland James L.
U.S. Philips Corporation
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