Abstract: A noiseless ratchet drive mechanism comprises one first element with a band shell for cylindrical friction drive engagement fixed on each side. Adjacent to this first element on each side disposed a second element coaxial with the first on a shaft. This second element consists of a disc member with a plurality of integral links, and each link is connected with a second link with its one end passing through a hole in a band ring which forms the rim of the second element. To the second link is fixed an arced brake which engages the inside of the shell for friction engagement with the first element. The turning of the second element in one direction engages the first element in friction drive while the turning of the second element in the opposite direction disengages the friction engagement.

Abstract: A noiseless ratchet drive mechanism consisting of a driven outer member including a sprocket wheel pivoting about the drive shaft and with a ring band forming a shell fixed on each side of the sprocket wheel concentrate to the drive shaft. On each side contiguous to this outer member disposed an inner member, one fixed to and the other pivoted about the drive shaft. Along the perimeter of each inner member disposed a number of ratchet drive mechanism friction engaging the shell, and with lever arms attached to each inner member so that pedaled oscillationwise the outer member is actuated rotating in one direction.