The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1978
Filed:
Jun. 10, 1976
Philip H Berger, Salt Lake City, UT (US);
Other;
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.