Title: Thermally responsive electric switch

Abstract: A thermally responsive electric switch for protecting electric motors comprises two sheet metal switch terminal members, one switch member having ear portions deformed around the other switch member to secure the switch members together. An intervening strip of insulation maintains electrical isolation between the two switch members and may be impregnated with adhesive to bond the switch members. One switch member mounts a thermally responsive bimetallic actuator carrying a movable contact and the other mounts a fixed contact. The fixed contact projects through an aperture in the insulation, such aperture registering with an aperture in the switch member carrying the movable electrical contact so that the electrical contacts engage by way of the registering apertures; thus the contacts are disposed in a protected position. Interengaging recesses and dimples may be provided in the switch members to prevent relative rotation therebetween.

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Inventors: Taylor, John C. (Castletown, GB)

Application Number: 888632
Filing Date: 1978-03-21
Publication_date: 1980-06-17
Assignee:
Primary Class(es): 337/372 337/85, 337/365
Other Classes:
US Patent Ref:

2790046	Apr, 1957	Richardson et al.	337/85.
2916586	Dec, 1959	Kuhn	337/89.
3066206	Nov, 1962	Dales	337/379.
3067306	Dec, 1962	Epstein	337/365.
3430177	Feb, 1969	Audette	337/365.
4103269	Jul, 1978	Grable et al.	337/85.

Other Refs: 2720449939448

Nov, 1977	DE
Oct, 1963	GB

Primary Examiner: Broome, Harold
Assistant Examiner:
Attorney: Fishman and Van Kirk