in which the clutching pressure is produced by springs only

Friction clutches > with axially-movable clutching members > with flat clutching surfaces, e.g. discs > in which two axially-movable members, of which one is attached to the driving side and the other to the driven side, are pressed from one side towards an axially-located member > with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member > in which the clutching pressure is produced by springs only

Friction clutches (arrangements for synchronisation F16D23/02) > with axially-movable clutching members (similar brakes F16D55/00) > with flat clutching surfaces, e.g. discs > in which two axially-movable members, of which one is attached to the driving side and the other to the driven side, are pressed from one side towards an axially-located member > with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member > in which the clutching pressure is produced by springs only