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:
Feb. 17, 1987
Filed:
Mar. 13, 1986
Akira Tanimoto, Mie, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A current limiting type circuit breaker includes first and second contact arms each pivotally mounted so as to be driven to an open position by an electromagnetic repulsive force, a trip device responsive to an output from a means for detecting a fault to drive the second contact arm to the open position, magnetic substances placed at opposite sides of the contact arms so that the magnetic resistance for magnetic fluxes occurred around the contact arms is decreased, and an attracting stationary conductor placed near the free end of the second contact arm in the open position. The attracting stationary conductor is connected in series with the first contact arm. When an excessive current flows through the contact arms, an electromagnetic attractive force is generated between the attracting stationary conductor and the second contact arm, which force increases the rate at which the second contact arm is moved to the open position.