US PATENT SUBCLASS 74 / 357
.~.~.~.~ Progressive

Current as of: June, 1999
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74 /   HD   MACHINE ELEMENT OR MECHANISM

640  DF  GEARING {31}
325  DF  .~ Interchangeably locked {11}
*  DD  .~.~ Slidable keys or clutches {3}
*  DD  .~.~.~ Multiple clutch shafts {4}
357.~.~.~.~ Progressive {1}
358  DF  .~.~.~.~.~> Keys simultaneously slidable

DEFINITION

Classification: 74/357

(under subclass 325) Transmissions wherein there are a plurality of slidable keys or clutches splined to a plurality of shafts which are connected to each other by constant mesh gears revoluble on the shafts, and provided with clutch elements adapted to be engaged by the slidable clutches or keys, the keys or clutches being manually shifted in a manner to provide a progressive change in gear ratio.

SEE OR SEARCH THIS CLASS, SUBCLASS:

337.5, for cam operated controls for interchangeable locked gearing.

363, for progressive transmissions utilizing a single clutch shaft.