Communications: electrical – Systems – Call station
Patent
1975-11-07
1977-02-15
Swann, III, Glen R.
Communications: electrical
Systems
Call station
180103R, 340 52R, 340244C, G08B 2100, B60Q 900
Patent
active
040084663
ABSTRACT:
An angular indicator indicates the relative angular relationship between a towed vehicle and a towing vehicle. A housing of the indicator is mounted on the towing vehicle. A movable arm has one end coupled to the towed vehicle and its other end coupled to the housing and is slidable along a slot provided within the housing. A variable slide resistor is arranged within the housing and is coupled to the end of the movable arm which is slidable along the housing. The variable resistor provides a resistance which varies in dependence upon the relative angular movement between the coupled towed vehicle and towing vehicle. An electrical measuring circuit has an input terminal which is electrically coupled to the resistance of the variable slide resistor and provides an output signal varying in dependence upon variations in the resistance of the variable slide resistor. A volt meter is coupled to receive the output signal from the electrical measuring circuit and provides an indication of the relative angular relationship between the coupled towing vehicle and towed vehicle. A water-sensing probe is mounted on the towed vehicle to short the input terminal of the electrical measuring circuit to the frame of the towed vehicle when the probe contacts water. This produces a maximum reading on the volt meter, indicating the towed vehicle is at the proper depth for launching a boat therefrom.
REFERENCES:
patent: 3237177 (1966-02-01), Sparks et al.
patent: 3431779 (1969-03-01), Wilken et al.
patent: 3694804 (1972-09-01), Hill
patent: 3821699 (1974-06-01), Marus et al.
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