Fixture for special gears, particularly of bicycles

摘要

A fixture for mounting sprocket wheels on and removing them from the free-wheel units of bicycles, comprising a first tool in the form of an elongated metal plate, having a handgrip and a functional part provided with a plurality of recesses shaped to receive and mate with elements of a free-wheel unit, and cooperating with at least two locking pin members, and a second tool comprising a handle, provided at one end with a half- moon shaped body having a length of bicycle transmission chain pivotally connected to one end thereof. The recesses in said first tool are apt to mate with the outer profile as well as with the wall of an inner hole of the free-wheel unit elements having to be applied to said tool. The second tool comprises, in order to engage the sprocket wheels of said free-wheel unit, on one hand said transmission chain length and, on the other hand, a pair of chain links mounted so as to form an articulated parallelogram.