Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1990-07-12
1991-05-21
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335 78, 337140, H01H 6702
Patent
active
050178989
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.
REFERENCES:
patent: 3810059 (1974-05-01), Jost
patent: 3967227 (1976-06-01), Clarke et al.
patent: 4535309 (1985-08-01), Moreau et al.
patent: 4709219 (1987-11-01), Nestlen et al.
patent: 4739297 (1988-04-01), Fornasari
"JETI" vol. 36, No. 7, pp. 179-189 published by Sekiyu Bunkasha in 1988.
Donovan Lincoln
Omron Corporation
Picard Leo P.
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