A variable resistor includes an elongated housing, a dielectric base which supports elongated resistive and conductive strips, and a cover member. An elongated guide rail is mounted on the dielectric base and extends parallel to the resistive and conductive strips. A slider or carrier is provided with a groove at the lower surface thereof for slidably engaging the upper surface of the guide rail of the base. A control member is connected to the upper end of the slider and projects through an elo...

A pushbutton switch of the type actuated by a push-push motion of a control member is provided with a compact miniaturized structure having means to facilitate smooth operation with a minimum of frictional resistance and at the same time to provide a sharp and reliable switching action. The switch body is provided with a generally heart-shaped channel adapted to receive the upstanding end of a driving member which in turn is carried by a push rod slidable into and out of the switch body between ...

A control device for use in volume adjustment of a multi-speaker sound system utilizes a floating carrier adapted to move within a housing enclosure in two dimensions. The carrier is provided with a plurality of electrical contacts adapted to slidingly engage respectively a plurality of resistive elements on a substrate. The carrier is moved by a control member extending through a window in the housing. The shape of the window and the resistive patterns of the plurality of resistive elements is ...

A switch particularly adapted for use with a variable resistance mechanism comprises a first fixed contact having an arcuate contact edge, a second generally U-shaped fixed contact spaced from said first fixed contact, and a resilient movable contact, one end of which is secured to one leg of the second fixed contact, said movable contact being normally flexed with its other free end biased into engagement with the arcuate edge of said first fixed contact. A rotor is provided with an integrally ...

This invention relates to an all channel tuner with means for tuning a variable capacitance element, said means interlocking with an operating shaft of a power source changeover switch. The power source changeover switch changes the polarity of a switching element for short-circuiting part of a coil for the tuning of a VHF tuner. A variable resistor selection switch adjusts a reverse bias to the variable capacitance element. The selection of a desired frequency band and the selection of the vari...

A device for fixing a switch unit into a keyboard switch. The switch unit is rectangular and has at least one stopper projected at one upper corner thereof, a knob engaging portion formed at the upper center thereof, and a pair of projections formed at opposite side surfaces thereof. A keyboard plate formed in a U shape has a plurality of bridge portions and a pair of cutouts for engaging the projections of the switch unit to fix the switch unit therein. A keep leaf spring having a center hole f...

A space key includes an elongated upper cover adapted to be touched with fingers, a lower guide plate and a spring disposed between the cover and the guide plate. A stabilizer rod having a center stem portion is rotatably received by the cover and Z-shaped end portions each pointed end of which is pivotably received in a corresponding notch formed in upright portions of the guide plate, whereby upon depressing the upper cover at any portion thereof the cover moves down without inclination toward...

Pushbutton control of a tuner is achieved by selectively positioning individual contacts on resistor strips formed on a baseplate together with lead wires cooperating with those resistor strips. Each pushbutton is associated with a shaft on which a resistor-contactor is adjustably mounted, the pushbutton in its known position being normally rotationally disengaged from the shaft but being rotationally engaged with the shaft when pushed inwardly. The shaft actuated by a given pushbutton moves a f...

An actuating member for a switch mounted on a circuit board has a projection that moves therewith and which slidably engages the board, so that the knob is reliably guided in a defined path as it actuates the switch. Preferably, the actuating member comprises knob on which the projection is formed, and the board has a slot for receiving the projection.

An electrical switch having fixed contacts with which a movable contact is adapted to selectively engage as the switch is actuated. The movable contact is so constructed and so mounted in a recess in a carrier therefor that misalignment or tilting of the carrier will not significantly affect engagement between the contacts.