US 7,549,357 B2
	Ratio changing method and apparatus
John P. R. Hammerbeck, Rawlings House, 2a Milner Street, London SW3 2PU (United Kingdom)
Appl. No. 10/551,398 PCT Filed Apr. 05, 2004, PCT No. PCT/GB2004/001477 § 371(c)(1), (2), (4) Date Sep. 29, 2005, PCT Pub. No. WO2004/088166, PCT Pub. Date Oct. 14, 2004.
Claims priority of application No. 0307886.2 (GB), filed on Apr. 04, 2003; and application No. 0321721.3 (GB), filed on Sep. 16, 2003.
Prior Publication US 2006/0196306 A1, Sep. 07, 2006
Int. Cl. F16H 3/70 (2006.01)

U.S. Cl. 74—640  [475/166; 475/169; 475/175; 475/162]

24 Claims

1. An apparatus for providing a rotational output comprising a rotatable output element, a transfer element providing a traversable circuit relative to the rotatable output element, a constraint arranged to constrain the transfer element against rotation about its own axis but allow eccentric oscillation of the transfer element, and an input drive, in which the input drive is rotatable and arranged to cause oscillation of the transfer element by traversal thereof, relative to the rotatable output element, to provide a rotatable output, further comprising a frictional or positive coupling between any of the input drive, transfer element and output element.