Channel-selecting, presettable, rotary type tuning device
AssigneeNihon Technical Kabushiki Kaisha
InventorsTamaki Ohashi, Susumu Sato
Life of this patent
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Abstract
A channel-selecting, presettable, rotary type tuning device in which there is provided a tuning-position-determining unit having two or more tuning-position-determining elements, whose positions may be adjustable; a slide member operably coupled to a variable tuning element and spring-loaded so as to abut the end of each tuning-position-determining element selected due to the rotation of the tuning-position-determining unit; means for rotating the tuning-position-determining unit so as to select a tuning-position-determining element; means for moving back and forth each tuning-position-determining-element thus selected; and means for temporarily releasing the slide member from its abutment on each tuning-position-determining element thus selected.
Claims10
A channel-selecting, presettable rotary type tuning device comprising:
- (a) a rotatable tuning unit having a plurality of tuning elements located at predetermined angular spacings along a circumferential end surface of said tuning unit;
- each said tuning element being movable in a direction parallel to the rotational axis of said tuning unit;
- (b) a channel selecting shaft parallel to the rotational axis of said tuning unit and adapted to be manually rotated in either a clockwise or counter-clockwise direction, the tuning unit being rotated in response to the rotation of the channel selecting shaft;
- (c) a slide member having one end coupled to a variable electrical tuning element and the other end adapted to selectively abut one of the tuning elements as said tuning unit is rotated in order to select a desired channel, the frequency of the selected channel being determined in accordance with the position of the tuning element abutting said slide member;
- (d) a tuning shaft having an operating knob and arranged in parallel relationship with said channel selecting shaft and adapted to be rotated when said knob is depressed, the depression of said knob causing the tuning shaft to slide axially and cause a first transmission member to operably engage a second transmission member associated with each said tuning element whereby rotation of said tuning shaft varies the position of the tuning element abutting said slide member to preset a desired channel frequency;
- (e) cam means adapted to rotate when said channel selecting shaft and said tuning unit are rotated;
- and
- (f) lever means cooperatively associated with said cam means and said slide member whereby the rotation of said cam means causes the lever means to displace the slide member from its abutment with a preselected tuning element and maintain said displacement until the next channel is selected whereupon said slide member returns to a position abutting the tuning element corresponding to the next selected channel.
Dependencies are inferred from the claim text.