| 摘要 |
An expandable pulley comprising a plurality of adjacent segments, each segment being radially moveable, each segment slidingly engaged with a pin member, each pin member having an engagement with each segment such that each segment is moveable in a direction substantially at an angle (alpha) to a radial along each pin member, a moveable guide member engaged with each segment for spatially locating each segment with respect to another segment, a counterweight cooperatively connected to each segment and cooperatively engageable with each pin member, each counterweight exerting a force opposing a segment centripetal force, and each pin member connected to a hub.
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