(under subclass 137) Subject matter wherein the coil is formed of a helically or spirally wound conductor, a movable contactor being provided to make contact with the coil, the conductor contact being movable along the length of the helical or spiral conductor and maintaining a continuous contact with the conductor during such movement so that the conductor contact of the contactor travels in the helical or spiral path defined by the conductor and so that in the range of adjustment of the contactor the change in effective impedance is continuously changing (as distinguished from a step-by-step change).
(1) Note. If the device is also provided with means so that the contact can be moved out of contact with the conductor to make a large discontinuous change in inductance, this will not exclude the patent from this subclass.
(2) Note. An illustrative example is: [figure]
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.
334, Tuners, 72+, for tuners having a variable inductor of the type in which a movable contact is adjusted over the length of the inductor.
338, Electrical Resistors,
143+, for mechanically variable electrical resistors in which the contact terminal moves along the turns of the helical resistance element.
