Communications: electrical – Selective – Having indication or alarm
Patent
1981-01-30
1982-09-28
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
340 58, 340563, B60C 2300, G08B 1900
Patent
active
043520901
ABSTRACT:
An automobile detection and alarm device detects obstacles near the automobile and abnormal conditions of tires on the automobile. An oscillator is provided which either oscillates or does not oscillate depending upon the value of a capacitance present between first and second electrodes. Preferably one of the electrodes is connected to the automobile body and the other electrode is either grounded or is connected to an antenna which is mounted on the automobile but insulated there from. Obstacles near the car change the effective capacitance between the two electrodes either by providing a dielectric effect or by acting themselves as an extension of electrical ground. In order to detect abnormal pressure of tires, the capacity between the car body and ground or between a steel portion of a steel radial tire and ground is detected.
REFERENCES:
patent: 1870181 (1932-08-01), Mallory
patent: 2274557 (1942-02-01), Morgan et al.
patent: 3895347 (1975-07-01), Takusagawa et al.
patent: 4072926 (1978-02-01), Shimahara et al.
patent: 4240061 (1980-12-01), Cohen
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