Communications: electrical – Selective – Having indication or alarm
Patent
1974-10-03
1977-02-01
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
307 10AT, 340274R, B60R 2510, G08B 1308
Patent
active
040064514
ABSTRACT:
An alarm circuit module for automobile, home or industry comprises a time delay device, such as a thermostatic relay, having a set of thermally responsive contacts and an electrical heating element. When energized, the heating element causes the contacts to close for connecting an alarm to a source of power, such as a battery. The heating element is energized by the battery through sensor switches in doors, windows, etc., responsive to unauthorized entry. When the alarm is readied with a lockable switch, and a door responsive sensor switch is closed by an unauthorized entry, energization of the heating element causes the thermally responsive contacts to close. And when the switch is subsequently opened, residual heat contained in the set of thermally responsive contacts causes the alarm to remain energized for a preset period of time. When the contacts cool, the alarm is automatically deenergized to save the battery. The alarm circuit module contains a minimum number of components and is easily installed to operate with the battery and horn standardly supplied in an automobile by connecting four wires from the module to readily accessible wires under the dashboard. The alarm circuit is tested from the dashboard with a test switch and lamp incorporated with the module. The test switch also functions as a panic button manually operable during an emergency to energize the automobile horn for the preset time period.
REFERENCES:
patent: 2892181 (1959-06-01), Benson et al.
patent: 2935730 (1960-05-01), Procter
patent: 3281785 (1966-10-01), Oursler
patent: 3329935 (1967-07-01), Wiggins
patent: 3422398 (1969-01-01), Rubin
patent: 3582853 (1971-06-01), Morris
patent: 3686668 (1972-08-01), Durkee
patent: 3858175 (1974-12-01), Kopera, Jr.
patent: 3863212 (1975-01-01), Kyo
Caldwell John W.
Nowicki Joseph E.
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