| 摘要 |
A device for mounting and centering a work piece with circular inner and/or outer surfaces e.g. in a machine tool, comprising two or more identical conical surfaces formed on a shaft or sleeve and supporting each a series of balls or similar members, which are radially displaceable to transfer the engagement with the circular surface of the work piece by relative axial displacement between the shaft or sleeve and one or more spacer members co-operating with the balls. The balls are arranged to engage directly with the circular surface of the work piece or to transmit the engaging action by means of at least three entirely separate and radially displaceable transfer members co-operating with the balls and equally distributed about the periphery of the shaft or sleeve.
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