Abstract: A switch includes a casing having a pair of first conductive connecting pieces, a rotary member having a plurality of second conductive connecting pieces, and a switching electrical circuit having a plurality of conductive traces. The second conductive connecting pieces selectively bridge the conductive traces to obtain a plurality of combinations of electrical connections for the switching electrical circuit. A driving member has a third conductive connecting piece and a tongue. The driving member is movable between a first position, in which the third conductive connecting piece interconnects the first conductive connecting pieces, and a second position, in which the third conductive connecting piece disconnects the first conductive connecting pieces. The tongue turns the rotary member a pitch of the latter each time the driving member moves from the first position to the second position. An urging unit urges the driving member to move from the second position to the first position.

Abstract: A speed-changing device for electric ceiling fans includes a run coil for electrical connection to a motor of a ceiling fan, and a starting and speed changing coil, together with a starting capacitor, parallel-connected to the coil. The starting and speed-changing coil includes a set of medium-speed taps and a set of low-speed taps, forming three speed-changing coils, in which speed-changing connections can be switched without producing any noise from the motor, by maintaining the same current direction after switching.