Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-11-13
1980-12-02
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
340568, G08B 1314
Patent
active
042374502
ABSTRACT:
An appliance theft alarm for mounting on or inside an electrical appliance which, when the electrical plug connecting the appliance with a wall electrical outlet is removed, will sound an audible alarm in order that the theft may be detected.
Specifically, electrical apparatus is interconnected so that the electrical power cord running between the electrical appliance and the electrical wall outlet is sensed for the presence of electrical voltage, where when the electrical voltage is present, a relay is energized to inhibit the alarm circuit. When electrical voltage is removed, the relay becomes unenergized and in doing so, completes an electrical circuit for a self-contained battery to power an electrical horn or siren alarm. The battery is provided with a battery charger which is supplied ac current from the electrical line input. Additionally, a key controlled contact is provided to inhibit the alarm circuitry when desired or to interrupt the alarm when sounding. Relay lock-up means are also provided to prevent the alarm from being turned off, once sounded, by merely replugging the appliance's electrical plug into the wall.
REFERENCES:
patent: 3192518 (1965-06-01), Sliman
patent: 3289194 (1966-11-01), King
patent: 3484775 (1969-12-01), Cline
patent: 3553673 (1971-01-01), Fistell
patent: 3794989 (1974-02-01), Manley et al.
patent: 3836901 (1974-09-01), Matto et al.
patent: 4028691 (1977-06-01), Zeder
patent: 4075617 (1978-02-01), Wireman
McClanahan J. Michael
Waring Alvin H.
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