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. 21, 1991
Filed:
Jul. 12, 1990
Kiyoaki Kuzukawa, Ibaraki, JP;
Omron Corporation, Kyoto, JP;
Abstract
An electromagnetic relay comprises a force transmitting member for displacing a movable contact point member as an armature moves, to come in contact with a fixed contact point member. A pressing portion of the force transmitting member which is in contact with the movable contact point member is formed of a shape memory material restoring a previously memorized shape at or above a predetermined temperature. The fixed contact point and the movable contact point are abraded resulted from the long-term use of the electromagnetic relay, thereby reducing contact pressure between the two contact points and correspondingly increasing contact resistance, so that the contact points overheats. While the pressing portion of the force transmitting member overheats corresponding thereto, it changes into a predetermined shape by exerting a shape memory effect at or above a predetermined temperature to increase the contact pressure between the movable contact point member and the fixed contact point member, thereby eliminating the overheating between the contact points.