Patent ID: 7044012
Filing Date: 2006-05-16
Classification: F16H,Y10T

Abstract:
1. Actuating device comprising: a longitudinal shaft; an intermediate tailstock spindle positioned coaxially to and around the said shaft; an outside sleeve positioned coaxially to the said shaft and around the said intermediate tailstock spindle; internal thread coupling means making it possible to couple the longitudinal shaft and the intermediate tailstock spindle to generate an axial movement of one with respect to the other; external thread coupling means making it possible to couple the intermediate tailstock spindle and the outside sleeve and suitable for generating an axial movement of one with respect to the other; the said internal thread coupling means comprising internal roller elements engaged on the one hand with external and internal threading of the intermediate tailstock spindle and/or the said external thread coupling means comprising external roller elements engaged on the one hand with external threading of the intermediate tailstock spindle and internal threading of the outside sleeve; and selective coupling means making it possible to couple the shaft and the intermediate tailstock spindle or the intermediate tailstock spindle and the internal thread of the outside sleeve selectively while rotating.