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US 6,184,601 B2Granted
Thermally responsive protection apparatus
AssigneeShop Vac Corporation
InventorsMark E. Baer, Gary C. Berray, James F. Streeter
Life of this patent
Estimating the term…
Abstract
A thermal protection mechanism for electric motors includes a pair of spaced contacts secured to an electrically insulated carrier. The contacts are engaged with a fusible electrically conductive pin made of solder that interposes along a current path to the windings of a motor. A thermal overload conditions causes the pin to fuse, thereby terminating operation of the motor.
Claims11
A protection apparatus for an electric motor having a winding, comprising:
- an electrically insulating carrier;
- first and second electrical contacts spaced apart and secured to the carrier;
- and
- a fusible electrically conductive pin having a first end portion and a second end portion, wherein the first and second end portions are engaged with the contacts and at least one of the contacts forces the pin against the carrier, and wherein the pin is responsive to a temperature condition in the winding to cause the pin to fuse so that an electrical path between the contacts is interrupted.
1 more element
Dependencies are inferred from the claim text.