| 摘要 |
An apparatus for adjusting the grip of a tubular collet upon work, the collet receivable in a bore formed by a holder, and comprising a rotatable connector member having first and second thread connections to the collet and to the holder, respectively; the thread connections characterized as differential, with respect to the collet and to the holder, whereby as the member is rotated, the collet closes toward the work, with high mechanical advantage.
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