Abstract: A toggle lever for operating an electric switch and easily assembled, anti-rotation means for mounting the lever for limited pivotal movement within the mounting bushing of the switch. The toggle lever has an intermediate enlarged spherical portion including two short trunnions extending in opposite directions therefrom. The mounting means comprises a pair of interlocking semi-cylindrical molded insert halves having on their inner surfaces an annular socket for the spherical portion and each having a central hole to journal the corresponding trunnion when the two halves are placed therearound to form a subassembly.

Abstract: An improved limit switch operator head assembly is disclosed. The assembly includes a rotatable operating shaft which is rotatable in reverse switch commutating directions, and a helically coiled torsion spring for effecting return of the operating shaft to a center or non switch commutating position. It further includes a U-shaped member formed of thin spring steel which is held in friction producing abutting relation against the coils of the torsion spring to damp the snap-back action of the latter and thereby prevent reverse rotations of the operating shaft beyond its center position.

Abstract: Germanium semiconductor temperature switches are described which are capable of intrinsically switching between high and low resistance states within a temperature range up to 55.degree.C, and are adapted for operating at voltages up to 400 volts. These temperature switches are disclosed in various configurations. Basic circuits for adjusting the temperatures at which such switches switch within a range are disclosed. Preferred methods of making the same are also disclosed.

Abstract: A single-phase induction motor is provided with a simple capacitor-start control system. A precision current detector (reed relay) is used in the main winding circuit to fire a bidirectional thyristor and precisely control the starting and stopping points of energization of the start winding to cause the motor to accelerate to the desired speed. Although this small reed relay is a fast acting device that picks up on the leading side and drops out on the trailing side of each current half-cycle, chopping up of the current wave is avoided by the combination used. Thus, in view of the nearly 90 degree phase-shift between the main winding and start winding currents, the reed relay, with its dropout point being lower in current value than its pickup point on each half-cycle due to the inherent differential in its magnetic characteristics, applies a wide firing pulse to the thyristor at the most desirable time, that is, it widely overlaps the point where the start winding current passes through zero.