Abstract: A temperature-dependent switch is provided with a substance, which expands when heated in a housing, and a transmission part. The transmission part is displaceable by a diaphragm, a sealing part, accepting a beaded edge on the diaphragm with an annular groove is included. The integral housing serves to accept the substance which expands or contracts as a function of temperature, the sealing part, the diaphragm and the transmission part. A prong plate is fastened to housing for at least one electrical prong. The scaling part is provided with at least one recess to accept an insulating part. The transmission part is effectively connected with an electrical prong.

Abstract: A differential-temperature-sensitive device particularly useful for controlling an electrical switch in response to a difference in temperature comprises a first lever arm pivotably mounted at one end to a base member, a second lever arm pivotably mounted to the opposite end of the first arm, and a pair of temperature-sensitive elements each coupled to one of said lever arms for pivoting same in response to the temperature sensed, the control member, preferably an electrical switch, being actuated by the opposite end of the second lever arm.

Abstract: A detector for radiant heat has a housing with means movable therein between positions for controlling an electrical circuit. A pair of elongate metallic strips are disposed generally in overlaying relation and have adjacent portions thereof respectively interconnected, and one of the strips is adapted to be subjected to the radiant heat while generally shielding at least a part of the other of the strips therefrom. Means is spaced from the interconnected adjacent portions of the strips for separating them, and the one strip is elongatable upon subjection of radiant heat thereto relative to the shielded other strip for effecting pivotal movement of the strips generally about the separating means. Means is disposed between at least one of the one and other strips and the controlling means for effecting movement thereof to at least one of the circuit controlling positions upon the pivotal movement of the strips.