Abstract: A pull-push switch has one or two stationary contacts and one U-shaped elastic movable contact with two legs which, when not deformed, are adapted to resiliently make into contact with the stationary contacts. A cam is securely mounted on an operating shaft which can be axially shifted between the pulled and pushed positions. The cam has a small-diameter cylindrical portion contiguous with a tapered intermediate portion which in turn is contiguous also with a large-diameter cylindrical portion. The legs of the elastic movable contact are so positioned that they are normally maintained in contact with the peripheral surface of the cam as it is shifted in unison with the operating shaft so that when the shaft is pushed or pulled, the legs of the elastic movable contact rest on the small-diameter cylindrical portion of the cam and subsequently make contact with the stationary contacts, whereby the switch is closed.

Abstract: A rotary variable resistor comprising an insulation substrate having a partial-ring form resistor layer on the surface thereof, an operational shaft rotatably supported at a central portion of the insulation substrate, a brush supporter of a rotational body disposed substantially at one tip of the operational shaft and holding a brush rotatably sliding on the resistor layer, and a cover case of an insulation mold material covering the brush and the brush supporter, the improvement is that the rotational movement of the operational shaft is effectively stopped by a protrusion disposed on the inner wall of a thick part of a plastic mold cover case and on the side of lead terminals.