Toroidal friction wheel a is keyed to shaft 1 and rotates about fixed axis A. Toroidal friction wheel b, identical to wheel a, is keyed to shaft 3 and rotates about fixed axis B. Axes A and B of shafts 1 and 3 are perpendicular to each other and intersect at point 0. Roller 2 is in contact with wheels a and b and rotates about axis C. Roller 2 can be set to various angles φ by swivelling it about axis D which is perpendicular to the plane of the drawing. The transmission ratio from shaft 1 to shaft 3 is i₁₃=ω₁/ω₃=n₁/n₃=(d-r₂*cos(φ))/(d-r₂*sin(φ)) where ω₁, ω₃, n₁ and n₃ are the angular velocities and speeds (in rpm) of shafts 1 and 3, d is the distance from axis D to axes A and B, and r₂ is the radius of roller 2.
$3468$CF,IV$