| 摘要 |
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. The pivotal plate is positioned such that after initial engagement with the band selecting cam projecting it is pivoted out of engagement with the cam projection by operation of the overcenter spring assembly and therefore the plate does not interfere with the frequency tuning operation of the pushbutton resulting from the full inward manual depression of the pushbutton.
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