Patent ID: 7442126

Claim:
A constant velocity coupling wherein the conditions for substantially equal instantaneous transfer of angular velocities between a first shaft and a second shaft are maintained by a control mechanism, said coupling including: (a) a first shaft rotation axis of said first shaft; (b) a second shaft rotation axis of said second shaft; (c) a control mechanism; (d) a generally U-shaped first shaft yoke provided with a first shaft control pin attached to one arm of said first shaft yoke, wherein an axis of said first shaft control pin, said first shaft rotation axis, and an axis defined by journals of said first shaft yoke intersect at a geometric centre of said coupling; (e) a second shaft boss having an axis normal to said second shaft rotation axis; and (f) a second shaft control pin; wherein an axis of said second shaft control pin, said second shaft rotation axis and a rotation axis of said boss intersect at the geometric centre of the coupling, and wherein the control mechanism is adapted to constrain at least portions of said coupling so as to achieve a substantially constant velocity characteristic between the first and second shafts.