Abstract: A selective frequency scale display mechanism for a pushbutton AM and FM radio receiver is disclosed. Presetable cam projections are located on each of a plurality of tuning pushbuttons and predesignate each pushbutton for tuning the radio to either the AM or FM frequency waveband. Manual actuation of a tuning pushbutton causes a band selecting cam projection to selectively engage and pivot a pivotal plate which results in actuating an overcenter spring assembly that in turn pivots a multisurface display body having different longitudinally extending scales on each of a plurality of its surfaces. In this manner, manual actuation of a tuning pushbutton results in selecting the band to which the radio will be tuned to, selecting the individual frequency within this band that the radio will be tuned to, and providing a visual display of the longitudinally extending scale which corresponds to the selected band.

Abstract: A switch assembly for providing a push-pull, double pole, switch action has molded cylindrical first and second housing portions having first and second pairs of electrically isolated contact terminals fixedly mounted therein in electrical isolation and extending outwardly from the housing portions which are formed with a central aperture therethrough. A switch operating plunger having a cam located intermediate the ends of the plunger is positioned within the housing, the ends of the plunger extending outwardly through the central aperture of the housing portions. The plunger and cam are mounted for limited axial reciprocating movement within the housing portions between a first and second position.

Abstract: A rotary wiper contact supported on a hub is housed between a substrate having a resistive element and a bracket means to form a potentiometer subassembly. The bracket and substrate are fixedly mounted to a pushbutton tuner frame with the hub of the wiper contact directly mounted on the treadle bar for integral movement therewith. Actuation of any pushbutton or the manual tuning shaft to select a predetermined frequency rotates the treadle bar and the wiper contact varying the effective resistance of the potentiometer which controls the voltage of a varactor to tune the receiver.