US PATENT SUBCLASS 318 / 295
.~.~.~.~ Potentiometer-controlled

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

280  DF  MOTOR-REVERSING {4}
287  DF  .~ Armature or primary circuit control {2}
291  DF  .~.~ Armature or primary current reversal {2}
293  DF  .~.~.~ Reversing polarity of current supplied to armature circuit {2}
295.~.~.~.~ Potentiometer-controlled

DEFINITION

Classification: 318/295

(under subclass 293) Subject matter in which means for providing current of reversible polarity comprise an impedance device having one or more conductors positionable in energy transfer relationship to the impedance and movable therealong.

(1) Note. Typical of polarity-reversing potentiometers is a resistor having DC input leads connected to the ends of the resistor and two output conductors connected to the motor armature each output conductor slidably engaging the resistor intermediate the ends thereof, so that by sliding one of the output conductors past the other, the polarity of the DC current supplied to the armature circuit is reversed.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

15, for voltage divider systems.

323, Electricity: Power Supply or Regulation,

364, for miscellaneous resistance systems. 338, Electrical Resistors,

68, for mechanically variable electrical resistors, per se, such as rheostats and potentiometers.