Communications: electrical – Selective – Having indication or alarm
Patent
1977-08-23
1979-05-15
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
340539, 340566, 200 6152, B60R 2510
Patent
active
041550676
ABSTRACT:
An alarm device for detecting movement of parked automobiles provides a support for mounting on an automobile. An outer member defines a ring having an inner surface of conducting material. A helical spring is attached to the support to suspend the ring in an attitude where the ring defines an aperture in cross-section. An inner member having an outer surface of conducting material is connected by a flexible connection to the support to be suspended in said outer member and spaced from the inner surface thereof.
REFERENCES:
patent: 2075040 (1937-03-01), Kieber
patent: 3562706 (1971-02-01), Mason
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