Patent ID: 7098419
Filing Date: 2006-08-29
Classification: B23K,B25B,F16H

Abstract:
1. Driving device for the relative displacement of two members, in particular for the displacement of two arms of a clamping tool, comprising: a screw of the reversible type with a high yield and having a large pitch, said screw being capable of being set into rotation about an axis in one direction or in an opposite direction by a motor, a nut cooperating with the screw and designed to be driven in translation in the direction of the screw axis, said nut being integral in translation with one of the two members, said nut being provided with at least one tracking component, at least one slideway along which the at least one tracking component is adapted to travel, said at least one slideway comprising a linear portion parallel to the axis of the screw and a helical portion which is connected to the linear portion, the linear portion of the at least one slideway defining linear guidance parallel to the axis of the screw to lock the rotation of the nut in a first phase of displacement of the nut, the helical portion of the at least one slideway defining helical guidance which extends along the axis of the screw and which has a reverse pitch relative to the pitch of the screw to allow the rotation of the nut in the same direction of rotation as the screw in a second phase of displacement of the nut, to enable the transverse pitch of the screw and hence the translational speed of the nut to be decreased in this second phase of displacement, in which the nut exerts a clamping force, a large proportion of which is absorbed by the helical portion of the at least one slideway owing to the reversible screw.