| 摘要 |
<p>A rotating toolholder (1) comprises a spindle (2) mounted so as to rotate in a housing (3), a bush (4) movably associated with the spindle (2) and rotating as one piece therewith, elastic means (7) acting on the bush (4) o oppose movement of the bush (4), safety means (10, 11) in the housing (3) and the bush (4) respectively capable of changing reversibly from a disengaged configuration to an engaged configuration in which they oppose rotation of the spindle (2). The bush (4) can move axially between an operating position in which the spindle (2) is free to rotate and a stand-by position in which rotation of the spindle (2) is prevented when the safety means (10, 11) are in the engaged configuration. Safety means (10, 11) comprise a safety member (10) which engages with and disengages from a safety member (11) through a movement having a radial component. Toolholder (1) comprises elastic means (12) acting on the safety member (10) to keep it engaged with the safety member (11).</p> |
