US PATENT SUBCLASS 474 / 20
.~.~.~ Including interengaged threads

Current as of: June, 1999
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474 /   HD   ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS

8  DF  PULLEY WITH BELT-RECEIVING GROOVE FORMED BY DRIVE FACES ON RELATIVELY AXIALLY MOVABLE COAXIAL CONFRONTING MEMBERS (E.G., EXPANSIBLE CONE PULLEY, ETC.) {13}
17  DF  .~ Load responsive {2}
19  DF  .~.~ Via relatively rotating cam and follower {2}
20.~.~.~ Including interengaged threads

DEFINITION

Classification: 474/20

Including interengaged threads:

(under subclass 19) Subject matter wherein each of the relatively rotating elements is generally cylindrical in cross sectional configuration, a cylindrical wall of one of the elements having an external helical ridge forming an actuating surface, and a cylindrical wall of the other of the elements having an internal helical ridge forming a cooperating actuating surface; the two cylindrical elements being coaxially mounted with the external ridge of one interengaged with the internal ridge of the other so that relative rotation of the elements also causes relative axial

movement of the elements and axial movement of a component associated with the axially moved element. [figure]