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. 10, 1977
Filed:
Feb. 19, 1976
Masahiro Adachi, Yokohama, JA;
Nissan Motor Co., Ltd., , JA;
Abstract
A device for detecting any failure in a plurality of loads connected in parallel with one another comprises an indicator lamp connected in series with first and second magnetically operable switching elements. A control circuit comprising first and second coils associated, respectively, with the first and second switching elements is connected in series between a DC power source and the parallel connected loads. A third coil associated with the first switching element and producing a magnetic field opposing that of the first coil is connected in series with a resistor across the power source. A zener diode in series with a resistance is connected in parallel with the third coil. The sensitivities of the first and second switching elements and the coil constants are adjusted so that the first switching element is opened only when the number of the load failures is between 1 and K-1, where K is an integer between 2 and n, while the second switching element is opened only when at least K loads fail on condition that the intensity of the composite magnetic field produced by the first and third coils is close to zero when the number of the load failures is K-1.