Tapered friction disk 1 rotates about fixed axis A and is in contact with two identical hemispheres 2 which rotate about axes 0C and 0B, and can be swivelled about fixed axes C and B of pins a of levers 7 and 6. Tapered friction disk 3 rotates about fixed axis D and is also in contact with hemispheres 2. Levers 6 and 7 are connected by turning pairs E and F to nuts 9 and 8, connected, in turn, by screw pairs to screw 4. Screw 4 has right-hand thread at one end and left-hand thread at the other. The lengths of the links comply with the conditions: C͞F=B͞E, the radii r of the circles of contact of disks 1 and 3 are equal, as are the radii R of hemispheres 2. Owing to the symmetrical arrangement of the disks and levers 6 and 7, hemispheres 2 swivel through equal angles φ when screw 4 is turned, and the axes of rotation of the hemispheres intersect at point 0. The transmission ratio from disk 1 to disk 3 is i₁₃=ω₁/ω₃=n₁/n₃=(sin(γ+φ))/(sin(γ-φ)) where ω₁, ω₃, n₁ and n₃ are the angular velocities and speeds (in rpm) of disks 1 and 3, and γ is a constant angle equal to one half the angle between the straight lines passing through point B or C and the points of contact between disks 1 and 3 and a hemisphere 2. The pressure required between the friction surfaces to transmit a torque is developed by springs 5.
$3463$CF,IV$