Abstract: A motor has a stator disposed between a casing and a cap. The casing has a ring and four frame members formed together. Four posts are formed on the cap. The stator has an induction coil and a rotor is rotatedly disposed in the center of the stator. A shaft is fixed to the center of the rotor. The casing, the stator and the cap are fixed together by four screws. The cap and the casing are opened so that the motor has an excellent heat dissipation rate.

Abstract: A switch includes two casings engaged together. Four shafts are extendible through the upper casing. Four pairs of ribs are formed in the lower casing. A contact arm is received in the lower casing. Three conductors are provided in the lower casing. A retaining plate and a control plate are slidably provided between the protrusions and the ribs. Each conductor is caused to contact the contact arm when the shaft is depressed downward. Two or more shafts are prevented from being fully depressed by the control plate. A projection of each shaft slides between the ribs so that the shaft will not be distorted when two or more shafts are depressed simultaneously.