| 摘要 |
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.
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