Quick-clamping spindle

A quick-clamping spindle assembly comprising:

• a spindle body;
• a control rod;
• and
• a maneuvering head;
• wherein the spindle body has a wall, two ends and a clamping member at one of the ends thereof;
• the clamping member comprising a plurality of protruding structures disposed on the end of the spindle body thereof;
• wherein the maneuvering head is disposed within the spindle body and the control rod is disposed within the maneuvering head, for controlling use/withdrawal of said clamping member;
• wherein the control rod is axially movable within the spindle body and cooperates with the clamping member such that an axial pushing action on the control rod causes the plurality of protruding structures of the clamping member to radially emerge from the spindle body,
• the spindle assembly further comprising:
• at least one transverse shaft provided on the maneuvering head and a helical ramp provided in the wall of said spindle body engaging the transverse shaft, and a device for rotationally blocking said control rod in said spindle body;
• the device comprising a male element disposed on the spindle body and a female element disposed on the maneuvering head;
• the male element comprising a radial opening provided in the spindle body being open toward the maneuvering head, a lug housed in said radial opening, and a spring located in said radial housing having an end resting against a bottom of the radial opening and another end bearing on the lug,
• the female element comprising a series of cavities including a first cavity located on a circumference of the maneuvering head at a same level as the radial opening, the first cavity being angularly offset with respect to an axis of the lug by an angle such that, once the control rod is free to rotate, the first cavity is in such a position that the lug is inserted into the this first cavity.