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:
Nov. 11, 1980
Filed:
Aug. 18, 1978
Robert J Green, Deptford, GB;
Gerald A Hales, Deptford, GB;
Molins Limited, , GB;
Abstract
Monitoring system for an emergency stop circuit controlling a number of machines in a factory, to determine the location of an actuated stop button. The stop circuit consists of a supply line to a self-latching contactor and there is an emergency stop button in the circuit at each machine. A monitoring line runs parallel to the supply line and is connected to each section between adjacent stop buttons by high value resistors. When a voltage is applied to the supply line a current appears in the monitoring line whose magnitude depends upon the position of the actuated stop button and thus is connected to a voltage which is applied to a series of comparators driving light emitting diodes. Each comparator is provided with a different reference voltage from a resistive chain and since the L.E.D.'s are connected between the outputs of successive comparators along the chain, only the L.E.D. whose position represents the position of the actuated button is illuminated.