(under subclass 9) Subject matter in which the transmitting mechanism is adapted to drive a load device at two or more speeds for a given single speed of the electric motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
8, for variable speed power or motion transmitting mechanism (differential gearing) driven by plural diverse or diversely controlled electric motors, as by driving two input shafts, to obtain a variable speed of the output shaft of the gearing.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism, appropriate subclasses for the particular mechanical variable speed transmission device, per se.
310, Electrical Generator or Motor Structure, 92+, for variable speed magnetic-field type clutch driven by electric or other motors.
474, Endless Belt Power Transmission Systems or Components, appropriate subclasses for a variable speed endless belt power transmission.
475, Planetary Gear Transmission Systems or Components, appropriate subclasses for variable speed gearing in planetary transmission.
