US PATENT SUBCLASS 336 / 137
WITH MEANS TO CHANGE COIL LENGTH OR CONNECTIONS

Current as of: June, 1999
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336 /   HD   INDUCTOR DEVICES

137WITH MEANS TO CHANGE COIL LENGTH OR CONNECTIONS {8}
138  DF  .~> Parallel-spaced conductors or coils bridged by movable connector
139  DF  .~> Contactor following helical conductor {2}
142  DF  .~> Coil connections changed by moving coil (e.g., coil substitution)
143  DF  .~> With connection reversing means
144  DF  .~> With variable number of short-circuited turns
145  DF  .~> Plural coils (e.g., transformers) {3}
149  DF  .~> Contactor slidable on coil winding
150  DF  .~> Series change (e.g., tap change)

DEFINITION

Classification: 336/137

(under the class definition) Inductor devices wherein a coil is provided with means (1) to change the physical length of the coil which is effective as an inductive component, or (2) to add or cut out turns or coils or to substitute a coil section or component of different characteristics or position for a coil or (3) to change the direction of current flow

through at least a portion of the coil conductor.

(1) Note. Illustrative examples are: [figure] [figure] [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

15, where the effective number of turns of the coil is varied by winding or unwinding the coil conductor.

116, where one of the coils is also movable with respect to another of the coils.

SEE OR SEARCH CLASS 74, Machine Element or Mechanism,

10+, and the subclasses specified in the notes thereto for mechanical mechanism for rotating a shaft including such mechanism designed for use with an adjustable inductor device. Also see the search notes to subclass 10 of Class 74 for the classification of other rotary shaft moving mechanism and for the line between Class 336 and Class 74.

323, Electricity: Power Supply or Regulation Systems,

255, and 340 for transformer systems with tapped windings.

334, Tuners,

47+, for tuners of the switch type and especially subclasses 56+ for a switch type tuner in which the inductor only is modified or substituted by switching.

343, Communications: Radio Wave Antennas,

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