Personnel cable transport safety system

Details Personnel cable transport safety system Personnel cable transport safety system

1976-06-10

1978-05-09

Swann, III, Glen R.

Communications: electrical

Systems

Call station

323 1, 340248A, 340409, 340421, G08B 2100

Patent

active

040889882

ABSTRACT:
A constant current generator supplies a constant current signal to a plurality of detectors and a reference resistance connected to an output line and a ground line. Each detector includes a reference resistor connected in series in the output line, and a sensor connected between the output and ground. Upon the incidence of an external stimulus, the sensor becomes conductive shunting out all resistance subsequent in circuit and causing a predictable voltage change at the output of the constant current generator. A trigger senses the voltage change and sends signals to cause operational signals to be sent as desired, for example, to shut down a personnel cable transport system (e.g., ski chair lift) and indicate the location of the external stimulus. A detector may be bypassed by placing a permanent magnet on or into its chassis. The constant current generator output is unaffected by changes in temperature.

REFERENCES:
patent: 3657695 (1972-04-01), Birmingham
patent: 3784844 (1974-01-01), McGrogan, Jr.
patent: 3896427 (1975-07-01), Campman
patent: 3991413 (1976-11-01), Berger

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