in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first mentioned members

Full Title

Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members (control of change-speed or reversing-gearings conveying rotary motion F16H59/00 - F16H63/00) > without members having orbital motion > Gearings providing a continuous range of gear ratios > in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first mentioned members