Communications: electrical – Selective – Having indication or alarm
Patent
1974-02-27
1976-04-27
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
340279, 200 6154, 180 99, 180103R, B60Q 100, H01H 900
Patent
active
039538303
ABSTRACT:
A safety device which may be coupled to a vehicle steering mechanism to provide an alarm indication of drowsiness or other inadequate steering activity by the operator, is disclosed comprising a transducer for providing a broad-band electrical signal in response to steering activity by the operator for all operable positions of the steering mechanism along with circuitry for monitoring this electrical signal and energizing an alarm when the electrical signal fails to satisfy some prescribed minimum condition. In one embodiment, a piezoelectric crystal is in contact with the steering shaft and the electrical output of the crystal is first amplified and then employed to maintain a charge on a capacitor. Means responsive to the capacitor charge falling outside the preferred charge range then energizes the alarm. In a second preferred embodiment, first and second conductive members comprising a portion of the vehicle horn actuating mechanism supply extremely weak signals to a preamplifier-detector circuit the output of which in turn is amplified and employed to maintain a capacitor charge within prescribed limits as in the first embodiment.
REFERENCES:
patent: 3106981 (1963-10-01), Chakiris
patent: 3222639 (1965-12-01), Kayser
patent: 3222640 (1965-12-01), Wurst
patent: 3559205 (1971-01-01), Colby
patent: 3588864 (1971-06-01), Gaulke
patent: 3594772 (1971-07-01), Setser
patent: 3631446 (1971-12-01), Setser
patent: 3794969 (1974-02-01), Klopfenstein
Caldwell John W.
Jeffers Albert L.
Klopfenstein Floren R.
Rickert Roger M.
Wannisky William M.
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