| 摘要 |
Disclosed is a rotating spindle assembly for a dental handpiece and a hollow cylindrical collet thereof to apply a variable gripping force by which to reliably retain a dental workpiece (e.g., a bur) and thereby prevent the bur from flying out of the collet when the bur is rotated at high speeds during a dental procedure. The collet includes a pair of collet members that are divided (i.e., spaced from one another) by a pair of longitudinally extending slots that are machined into opposite sides of the cylindrical collet. The pair of collet members are pivotally connected to one another at solid pivot junctions that are located in the pairs of slots. Accordingly, the pair of collet members rotate at the pivot junctions such that proximal ends of the collet members rotate towards one another to a closed position for collapsing around the bur and increasing the gripping force on the bur, or the proximal ends of the collet members rotate away from one another to an open position for reducing the gripping force and releasing the bur.
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