| 摘要 |
A device for releasably gripping a workpiece includes first and second axially elongated, cylindrical gripping sleeves, the second sleeve being coaxially supported within the first sleeve for axial movement relative thereto. Each sleeve includes a plurality of circumferentially spaced, axially extending segments, each connected at opposite ends to respective adjacent segments by relatively short integral webs. The radially outer surface of the first sleeve and the radially inner surface of the second sleeve are relatively smooth cylindrical surfaces. A plurality of axially spaced ramps are provided on the radially inner surface of each segment of the first gripping sleeve and on the radially outer surface of each segment of the second gripping sleeve. The ramps on the inner sleeve slidably engage respective ramps on the outer sleeve so that relative axial movement therebetween effects relative radial movement therebetween. A spring cooperable with the gripping sleeves urges relative axial movement therebetween.
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