Communications: electrical – Selective – Having indication or alarm
Patent
1974-10-21
1976-11-02
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
340 61, 325111, G08B 2100
Patent
active
039900401
ABSTRACT:
A distress-signal generator aboard a vehicle includes a transmitter with a self-locking relay for energizing a high-frequency oscillator from a local battery in response to one or more trigger signals from respective detectors, specifically an impact detector and a deformation detector. The impact detector comprises two coacting members, one of them fixed to the vehicle body and the other freely movable with reference thereto, the elastically suspended mobile member being generally spool-shaped and having its waist received in an oblong opening of the plate-shaped fixed member. With the major axis of the oblong extending in the direction of vehicle motion, contact between the two members occurs in response to relatively small transverse and vertical accelerations but only with relatively large longitudinal acceleration; relative torsion is detected by a horizontal pin on the mobile member bracketed by two stops on the fixed member normally spaced therefrom. The deformation detector includes a bent wire with a rigid but rupturable sheath conforming to the shape of the vehicle body at critical locations. The transmitter comprises a multivibrator tuned to an audio frequency and energized in parallel with the oscillator by the relay, this multivibrator working through an RC circuit into the base of a transistor forming part of the oscillator so as to apply to it a sawtooth signal modulating the generated high-frequency oscillation in both amplitude and frequency, the modulated oscillation being sent out via an antenna coupled with the tank circuit of the oscillator.
REFERENCES:
patent: 2473050 (1949-06-01), Camp
patent: 3102982 (1963-09-01), Stypulkowski et al.
patent: 3251033 (1966-05-01), Lawyer
patent: 3461423 (1969-08-01), Trumble
patent: 3699515 (1972-10-01), Barnett
patent: 3840088 (1974-10-01), Marumo et al.
Billottet Henri
Gleitz Jean-Jacques
Narbaits-Jaureguy Jean-Raymond
"Thomson-CSF"
Dubno Herbert
Ross Karl F.
Waring Alvin H.
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