US PATENT SUBCLASS 318 / 280
MOTOR-REVERSING

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

280MOTOR-REVERSING {4}
281  DF  .~> Periodic- or intermittent-reversing {1}
283  DF  .~> Automatic and/or with time-delay means {3}
287  DF  .~> Armature or primary circuit control {2}
296  DF  .~> Field circuit control {2}

DEFINITION

Classification: 318/280

(under the class definition) Subject matter in which means are provided for causing an electric motor to operate in one direction at one time and in the opposite direction at another time, or for causing an electric motor to operate in a direction opposite to that in which it has previously been operating.

(1) Note. In reversing motor systems, means must be provided for establishing an electrically produced torque in both directions of operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for the combination of an electric motor and reversible power or motion transmitting means actuated thereby.

48, for plural motor systems having the motors mechanically coupled in torque opposition.

65, and the subclasses specified in the Notes thereto, for reversing control in plural motor systems. 119+, for reciprocating or oscillating motor systems in which periodic reversal is an inherent function during normal operation of the motor.

159+, and the subclasses specified in the Notes thereto, for biassed motor systems, in which the biassing means will cause the motor to move to a prior position when the energization of the motor is reduced.

256+, and the subclasses specified in the Notes thereto for motor systems having reversing control means and means for effecting another control operation.

739+, and the subclasses specified in the Notes thereto, for reversal of induction motors.