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A screw-tightening spindle comprising a drive sleeve associated with a chuck comprising a cylindrical support member fitted with moving jaws, the cylindrical support member being provided externally with at least one stud extending radially outwards, the sleeve including at least one slot having a f

A screw-tightening spindle comprising a drive sleeve associated with a chuck comprising a cylindrical support member fitted with moving jaws, the cylindrical support member being provided externally with at least one stud extending radially outwards, the sleeve including at least one slot having a first segment opening out in a free edge of the sleeve and a second segment having an end portion forming an angle relative to the sleeve suitable for retaining the stud in the end portion of the slot when the stud is engaged therein, the sleeve being fitted with a ring having at least one stop extending radially inwards and received in the slot, the ring being mounted on the sleeve to slide between a locking position in which the stop extends in the first segment of the slot in register with the second segment, and an unlocking position in which the stop is retracted into a third segment of the slot.

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1. A screw-tightening spindle comprising a drive sleeve associated with a chuck comprising a cylindrical support member fitted with moving jaws, wherein the cylindrical support member is provided on its outside with at least one stud extending radially outwards, wherein the sleeve includes at least

1. A screw-tightening spindle comprising a drive sleeve associated with a chuck comprising a cylindrical support member fitted with moving jaws, wherein the cylindrical support member is provided on its outside with at least one stud extending radially outwards, wherein the sleeve includes at least one slot having a first segment opening out in a free edge of the sleeve and a second segment having an end portion forming an angle relative to the sleeve suitable for retaining the stud in the end portion of the slot when the stud is engaged therein, and wherein the sleeve is fitted with a ring having at least one stop which extends radially inwards from the ring and is received in the slot, the ring being mounted on the sleeve to slide between a locking position in which the stop extends in the first segment of the slot in register with the second segment, and an unlocking position in which the stop is retracted into a third segment of the slot. 2. A screw-tightening spindle according to claim 1, wherein the second segment of the slot extends from one side of the first segment of the slot such that when the sleeve is rotated, the stud of the cylindrical support member tends to be urged towards the end portion of the second segment of the slot. 3. A screw-tightening spindle according to claim 1, wherein the first slot segment extends substantially along an axial direction of the sleeve, and wherein the second slot segment extends along a substantially circumferential direction of the sleeve. 4. A screw-tightening spindle according to claim 3, wherein the third segment extends in line with the first segment. 5. A screw-tightening spindle according to claim 1, including means for resiliently urging the ring into the locking position.