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专利名称：TWO-WAY-DRIVEN 3-SPEED FREE WHEEL发明人：DIANLIN CHANG申请号：AU8035691申请日：19910710公开号：AU8035691A公开日：19920116
摘要：Disclosed is a two-way-driven 3-speed free wheel which provides a multi-gear-changing mechanism for use with various kinds of pedal cycles. The disclosed device hasfour kinds of catches: pawl, hook-pawl, backward pawl and forward pawl. The backwardand forward pawls respectively are hinged on the opposed sides of a sprocket wheel bysmall spindles mounted on the opposed sides of the sprocket wheel. On one side of thesprocket wheel are the backward pawls and an outer ring; on the other side are forwardpawls, a ratchet cone and a bearing collar. Between the outer ring and a central gear aretwo or more planet pinions. As compared with prior art structures, this invention has thefollowing advantages: the structure is simple, the cost is lower, and it is facile to operateand to change speed. Also disclosed are one-way-driven 2-speed free wheels and two-way-driven 2-speed free wheels, using two or three kinds of catches, of the above-described four kinds of catches.
申请人：DIANLIN CHANG
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