US PATENT SUBCLASS 318 / 70
.~.~.~.~ Electrical-type detectors

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

34  DF  PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22}
66  DF  .~ Running-speed control {4}
68  DF  .~.~ Relative motor speed control {5}
69  DF  .~.~.~ With speed-difference detector {2}
70.~.~.~.~ Electrical-type detectors {4}
71  DF  .~.~.~.~.~> Voltage and/or current difference detector
72  DF  .~.~.~.~.~> Dynamoelectric machine detector
73  DF  .~.~.~.~.~> Synchronously operated impedance detectors
74  DF  .~.~.~.~.~> Synchronously actuated switch detectors {1}

DEFINITION

Classification: 318/70

(under subclass 69) Subject matter in which the speed difference detecting or sensing means comprises an electrical device which, per se, generates, converts or controls electrical energy, or is activated thereby.

(1) Note. The detecting or sensing means itself must be an electrical device an not merely a nonelectrical device constituting an actuator for an electrical device. For example, an electromagnet having two windings and an armature actuated thereby wherein one winding is energized by current varying with the speed of one motor, the other winding energized by current varying with the speed of another motor

and the armature, responsive to the resulting energization of the electromagnet, constitutes an electrical type detector; namely, an electromagnet. However, a differential gearing device, one gear of which is moved at a rate which varies with the speed of one motor, another gear which is moved at a rate varying with the speed of another motor and the output element of the gearing connected to actuate an electric switch is not an example of an electrical detector; but is a mechanical type detector (namely, a differential gear) functioning as an operator for an electrical device; namely, the switch.