Abstract: A snap-acting thermostatic electric switch in which a snap-acting thermostatic disc is physically attached to a heater plate which in turn mounts movable contacts. A stepped rivet loosely mounts the disc and is headed over to tightly mount any one of a series of heater plates having different thicknesses. The heater plate is shaped to allow unimpeded snap motion of the disc yet provide improved heat conduction to the disc. The disc and plate are mounted on a spider support which is adjustably positioned within the switch compartment by means of a combination rivet and screw received in a threaded bore of the base of the switch. An insulator is loosely received on the base and is biased thereagainst by a spring which also biases the spider upwardly to provide positional stability. Another spring is placed between the spider and the heater plate to optimize contact opening.

Abstract: A thermostatic switch has a thermostatic subassembly located on a header so that movable contacts engage and disengage complementary contacts mounted on the header in response to temperature change. A knurled stud part has an interference fit in a header bore and a nut threadedly engages the opposite end of the stud means and bears against the opposite side of the header. The nut is rotatable for drawing the knurled stud part into the header bore to the desired degree to precisely locate the subassembly relative to the header during switch manufacture and calibration. The interference fit of the knurled stud part in the header bore otherwise cooperates with the nut to prevent rotation or axial movement of the stud means in any direction in the header bore.