| 摘要 |
A key assembly for receiving units employed in communications engineering, particularly for television receivers, comprises a plurality of mutually releasable depressible keys adapted to switch on storable, selectively adjustable electrical values supplied by channel memories consisting of a plurality of voltage dividers for capacitance diode tuning, further comprising, in association with the respective depressible keys, a plurality of depressible and rotatable knobs adapted to be rotated by means of a tool, said knobs being concealed behind a cover member slidably guided in a recess, said knobs being adapted to provide channel tuning and, if required, selection of the desired frequency range, said frequency range being adjustable by rotating the respective depressible and rotatable knob into any of a plurality of detented angular positions with the knob being in a position differing from the tuning position of the knob, and comprising a switch which is adapted to be actuated by means of a push rod which is capable of being operated through the medium of said cover member. Said switch actuating push rod (19) in addition constitutes said tool permitting said depressible and rotatable knobs (5) to be rotated. |
