Friction gear transmission systems or components – Condition responsive means to vary contact pressure
Reexamination Certificate
2006-07-18
2011-12-13
Joyce, William C (Department: 3656)
Friction gear transmission systems or components
Condition responsive means to vary contact pressure
C476S070000
Reexamination Certificate
active
08075444
ABSTRACT:
A friction drive device has first and second rollers, in which the ratio of the transmission power and the pressing power is nearly constant regardless of the magnitude of the transmission power. The rollers have center axes that are spaced apart by prescribed radial distance, and arranged relative to an x y coordinate system when the rollers are not under load such that the x y coordinate system has an origin corresponding to the center axis of the first roller, and the y-axis passes through the center axis of the second roller. The cam surface is located in a first quadrant of the x y coordinate system, and has a concave arc with a single radius, such that the concave arc has a cam surface center located in a third quadrant of the x y coordinate system near or on an imaginary arc defined by the prescribed radial distance.
REFERENCES:
patent: 2003/0199357 (2003-10-01), Ai
patent: 2005/0143211 (2005-06-01), Yamamoto
patent: 04-370447 (1992-12-01), None
patent: 08-277896 (1996-10-01), None
patent: 2002-349654 (2002-12-01), None
patent: WO 03/091602 (2003-11-01), None
The extended European Search Report of corresponding European Application No. 06795126.9, dated Mar. 2, 2011.
Global IP Counselors, LLP
Joyce William C
Nissan Motor Co,. Ltd.
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