Abstract: An electromagnetic clutch comprises a pair of cup-like sheet metal housing members facing each other and overlapping at their respective outer peripheries to form a radial air gap. The housings are spaced from each other to form a cavity for receiving an electromagnetic coil. One of the housing members is adapted for installation on a drive shaft while a bearing is affixed with respect to the other housing member such that the housing members may rotate relative to each other. First and second spacers are uniquely positioned in combination with the housing members together with the bearing and the shaft to provide an axial air gap and to control the flux transfer area of the radial air gap.

Abstract: A cam actuated switch permitting rotation in one direction with snap action and in the other direction without snap action. When the cam is rotated in one direction, the switch contacts are opened rapidly by a substantially radial step on the cam surface and a spring arm which presses a cam follower, disposed on another spring arm, against the surface. When the cam is rotated in the other direction, the cam follower is permitted to be displaced axially from the step by the other spring arm and thereby aligned with a ramp which moves both spring arms radially outward to close the switch contacts.

Abstract: A circuit for providing dual speed operation of a single phase alternating current motor having high speed main and starting windings and a low speed main winding. A selectively energizable energizing circuit for the high speed main winding includes a current relay responsive to current flow through the high speed main winding for completing an energizing circuit for the high speed starting winding and a selectively energizable energizing circuit for the low speed main winding includes a bidirectional current translating device and a second current relay responsive to the flow of current through the low speed winding to complete the high speed main winding energizing circuit. The bidirectional current translating device is responsive to electrical control signals which are inhibited while the speed of the motor is greater than a predetermined value.