| 摘要 |
A drive transmission for use on cycles or lifting gear comprises a manually driven input member (11), a drive element (12, 35) coupled to the wheel (59) or like driven member and a step-up gearing arrangement (14, 15) remote from the drive element (12, 35). The transmission also includes a change gear mechanism coupled to the drive element (12, 35), the change gear mechanism incorporating mutually engaging multiple sprocket devices (42) (46, 47, 48) using rollers (43, 44, 45) on one sprocket (42) to engage the other respective sprocket (46, 47, 48), a roller (66) carrying bevel wheel (50) engaging a split pinion (51) and a recirculating ball (77) worm (53) and wheel (54) drive.
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