US PATENT SUBCLASS 334 / 47
WITH SWITCHING MEANS

Current as of: June, 1999
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334 /   HD   TUNERS

47WITH SWITCHING MEANS {8}
48  DF  .~> Tuner switch rockable for fine tuning
49  DF  .~> Disk-type turret tuner
50  DF  .~> Drum or cylinder-type turret tuner {1}
52  DF  .~> Switch operated by variable tuning means {1}
54  DF  .~> Rectilinearly operated switch
55  DF  .~> Capacitor only modified or substituted by switching
56  DF  .~> Inductor only modified or substituted by switching {1}
59  DF  .~> Tuned transformer circuit substituted by switching {1}

DEFINITION

Classification: 334/47

(under the class definition) Subject matter wherein an element or elements of at least one tuned circuit is modified or substituted by a switching operation to thereby effectively change the resonant frequency to which the circuit is tuned.

(1) Note. The switching operation may be performed by a make and break mechanical switch or by an electrical switch such as a tube or semiconductor device. Plug in type tuned circuits are also properly classified in the subclass.

(2) Note. The modifying or substituting of the tuning circuit may be accomplished by shorting a portion of one or more of the tuned circuit elements, thus varying the frequency of the circuit, or by substituting elements in the tuned circuit or by switching one complete tuned circuit for another such as generally found in television tuners. Fine tuning of the tuned circuit may be accomplished by using an adjustable inductor and/or capacitor in addition to the switching means.

(3) Note. The mere operation of a switch which does not effect the tuning of the tuned circuit is not classified in this subclass but in subclass 39 above.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7, for push button and/or lever mechanically operated tuners which may be of the switch type.

86+, for tuners having an indicator to show the position or frequency to which the variable tuning element or elements are adjusted or switched. SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

10+, for mechanical mechanism for rotating a shaft including such mechanism designed for use with a switching means. See

also the Search Notes to subclass 10 for additional fields of search for moving mechanism.

200, Electricity: Circuit Makers and Breakers, appropriate subclasses for the construction of make and break type switching elements, per se.

323, Electricity: Power Supply or Regulation Systems,

255, and 340 for tap changers.

336, Inductor Devices,

137+, for the structure of inductors having means to change the length or connection of the inductor.

343, Communications: Radio Wave Antennas,

748, for loop type antennae with a variable reactance for tuning the antenna, and subclass 868 for loop type antennae having means for adjusting the coil length.