Thermally sensitive electrical switch

Abstract From the Canadian patent

A thermally sensitive switch has a thermally conductive body within which is a chamber into which extends at least one electrically conductive terminal. Occupying the chamber is an elastomeric body which is expansible and contractile in response to increases and decreases, respectively in its temperature. The, elastomeric body may be normally conductive or normally nonconductive, but in either event is conductive when in its expanded condition. When in its expanded, conductive condition the body, engages the terminal and is operable to establish a current path through the body to the terminal. The body may function as an onoff switch or as a rheostat, depending upon the composition of the …