Thermally responsive electric switch
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United States of America Patent
Stats
-
Jun 17, 1980
Grant Date -
N/A
app pub date -
Mar 21, 1978
filing date -
Mar 23, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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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