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:
Sep. 22, 1992
Filed:
Aug. 12, 1991
Robert R Mandy, Bingham Farms, MI (US);
Other;
Abstract
A hall lighting system includes a plurality of downlighting lamps all dedicated to hall illumination during normal power conditions. Each lamp is connected across a low voltage power source defined by the secondary winding of a stepdown transformer having its primary winding connected across a primary power source. When the primary power source is 'on' an emergency lighting system has a triple pole double throw relay located in a normal lighting position in which two of the poles of the relay connect a charger to an emergency battery power source of a voltage less than the voltage across the secondary winding and a third pole of the relay connects the lamps across the secondary winding. When the primary power source is off, the first and second poles connect the emergency battery power source to selected ones of the lamps and the third pole disconnects the secondary winding from lamps such that the only load other than system wiring across the emergency battery power source is that of the selected ones of the lamps to provide a minimal lighting of the hall in excess of a set minimum footcandle standard for a period of time in excess of a set minimum lighting period.