| 摘要 |
An expansible mandrel for loading and unloading a work member while the mandrel is rotating, comprises a frame having an abutment and a mandrel body slidable in the frame. Two slide members are mounted for radial movement within first recesses in the body and each include a radial projection for pressing the work member against the abutment and an inclined surface facing radially inwardly. A piston is movable relative to the body and includes an inclined surface engageable with the inclined surfaces of the slides. A first spring urges the piston rearwardly to bring its inclined surface into engagement with the inclined surfaces of the slides and urge the latter radially outwardly into engagement with the work member. A second spring urges the body and slides forwardly. A coupling rod moves forwardly by a first distance to become disengaged from the body to enable the body and slides to be pushed forwardly by the second spring, and moves further by a second distance to push the piston forwardly against the bias of the first spring. The coupling rod moves rearwardly by the second distance to enable the first spring to push the piston rearwardly, and moves further by the first distance to engage the body and pull the latter rearwardly. Two weight members are mounted in second recesses of the body for radial movement. A mechanical linkage operably interconnects the weight members and respective ones of the slides such that centrifugally-induced radial outward movement of the weight members produces radial inward movement of the slides and their projections when the piston is moved forwardly.
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