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:
Jan. 24, 1984
Filed:
Apr. 06, 1982
Applicant:
Inventor:
Takaaki Chuzawa, Osaka, JP;
Assignee:
Matsushita Electric Works, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ; H01H / ;
U.S. Cl.
CPC ...
335239 ; 335 62 ;
Abstract
A circuit protecting sensor comprises a cylinder divided into two cylinder members with a common magnetic head interposed between them, one of which members contains a viscous fluid sealed therein and an oil plunger and the other member contains an operating plunger projecting partly out of the cylinder, and the respective plungers are biased by a spring normally away from the magnetic head. When a short-circuit current is detected by a coil wound on the cylinder, the operating plunger is immediately attracted by the magnetic head independently of the oil plunger prior to its attraction to the magnetic head.