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:
Dec. 23, 1986
Filed:
Sep. 13, 1985
George T Mallick, Jr, Penn Hills Township, Allegheny County, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
Electrical apparatus is disclosed in which a line voltage supplies current to an electrically operated solenoid through an operable switch interconnected therebetween. A control circuit is coupled to the switch and controls the operation thereof such that the control circuit operates to increase the duration of current flow to the solenoid when the line voltage level decreases. The control circuit includes appropriate circuitry for generating a reference voltage independent of the line voltage level, for generating a control voltage proportional to the line voltage level, and for operating the switch to permit current flow to the solenoid whenever the control voltage exceeds the reference voltage. The control circuit can also include circuitry to increase the duration of current flow to the solenoid upon the occurrence of vibration with the solenoid above a predetermined level, and/or for increasing the duration of current flow upon initial energization of the solenoid.