Actuating device with intermediate rolling elements

Actuation device of any of the previous claims, characterised by the fact that the internal roller elements and/or the external roller elements comprise the ball bearings located between the internal and external threads, and that they comprise means for circulating or repositioning these ball bearings.

Actuation device of any of the previous claims, characterised by the fact that the internal roller elements and/or the external roller elements comprise longitudinally threaded rollers engaged with the internal and external threads, and that they comprise means for circulating or repositioning these rollers.

Actuation device of any of the previous claims, characterised by the fact that the said internal roller elements comprise threaded longitudinal rollers, the helix angle of the thread of the rollers being either equal to the helix angle of the thread of the shaft and different from the helix angle of the internal thread of the intermediate tailstock spindle or equal to the helix angle of the internal thread of the intermediate tailstock spindle and different from the helix angle of the thread of the shaft.

Actuation device of any of the previous claims, characterised by the fact that the external coupling means comprise threaded longitudinal rollers, the helix angle of the thread of the rollers being either equal to the helix angle of the internal thread of the outside sleeve and different from the helix angle of the external thread of the intermediate tailstock spindle or equal to the helix angle of the external thread of the intermediate tailstock spindle and different from the helix angle of the internal thread of the outside sleeve.

Actuation device of any of the previous claims, characterised by the fact that the internal roller elements comprise longitudinally threaded rollers (7), the helix angle of the rollers being equal to the helix angle of the internal thread of the intermediate tailstock spindle and different from the helix angle of the thread of the shaft and that the external roller elements comprise longitudinally threaded rollers (25), the helix angle of the thread of the rollers being equal to the helix angle of the external thread of the intermediate tailstock spindle and different from the helix angle of the internal thread of the outside sleeve.

Actuation device of any of the previous claims, characterised by the fact that the said coupling means comprise the coupling, making it possible to block selectively in rotation either the shaft and the intermediate tailstock spindle, or the intermediate tailstock spindle and the outside sleeve and the control mechanism of these coupling means.

Actuation device of any of the previous claims, characterised by the fact that the said coupling means (56) consist of relative differences between the helix angle of the threads of the shaft, of the intermediate tailstock spindle and of the outside sleeve and/or relative differences between the thread forms of the shaft, of the intermediate tailstock spindle and of the outside sleeve and/or relative differences between the pitch of the threads of the shaft, the intermediate tailstock spindle and the outside sleeve.

Actuation device of any of the previous claims, characterised by the fact that it comprises means for guiding the outside sleeve with respect to the said longitudinal and/or means of guiding the intermediate tailstock spindle with respect to the outside sleeve and/or means (83) of guiding the intermediate tailstock spindle with respect to the said longitudinal shaft.