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:
Jun. 20, 1978
Filed:
Apr. 21, 1977
Samuel Kimmelman, Cranford, NJ (US);
Ideal Corporation, Brooklyn, NY (US);
Abstract
A system for alternately flashing two groups of signal lamps, as commonly employed for emergency and police vehicles, school buses, or the like, is provided with a lamp failure indicating circuit comprising two separate relay coils connected, respectively, as parts of current load lines to the lamp groups so that each coil normally will act through a contactor to energize a pilot circuit, thus causing a pilot lamp to be lighted so frequently when all the signal lamps are functional that the pilot lamp appears to be steadily illuminated; yet a relay coil will not so act, and the pilot lamp then will flash intermittantly to indicate a lamp outage, when a signal lamp on the load line of either coil does not function. In one embodiment, each relay coil has a contactor of its own in a separate branch of the pilot lamp circuit; in another, the two relay coils act alternately to displace a common contactor in the pilot lamp circuit.