the centrifugal masses acting directly on the pressure ring, no other actuating mechanism for the pressure ring being provided

Full Title

Automatic clutches (varying the relationship between two coaxial shafts F16D3/10; freewheels, freewheel clutches F16D41/00) > actuated entirely mechanically > controlled by angular speed (F16D43/24 takes precedence; clutches in which the drive is transmitted through a medium consisting of small particles F16D37/00) > with centrifugal masses actuating axially a movable pressure ring or the like > the pressure ring actuating friction plates, cones or similar axially-movable friction surfaces > the centrifugal masses acting directly on the pressure ring, no other actuating mechanism for the pressure ring being provided