Railway work-site machine equipped with a mechanical unit for displacement of the track

In a railway work-site machine having a chassis and a track displacing mechanical unit articulated in all azimuths and connected to said chassis by lifting, shifting and longitudinal displacement jacks, which unit comprises a shifting roller wheel with inner flange and an outer lifting hook mounted in opposition to each other on opposite sides of each line of rails for the guiding thereof on the track and for the grasping of the rails and means for adjusting the height and track respective transverse position of each lifting hook with respect to the roller wheel associated therewith, the improvement of the track displacing mechanical unit being composed of a hook support comprising a transverse girder on the two ends of which the two lifting hooks are mounted movable and adjustable transversely to the track and of a roller wheel support comprising a transverse girder parallel to the hook support girder and on the two ends of which the two shifting flanged roller wheels are mounted in fixed position, wherein one of said two transverse girders is connected to the chassis of the machine by a full-azimuth articulation device comprising at least one longitudinal displacement jack, said girder having a pivot on which is articulated and pivotally mounted in a plane perpendicular to said two girders at least one connecting arm to which is fastened the other girder, wherein the lifting jacks are connected to the lifting hook support and the shifting jacks are connected to the shifting roller wheel support, and wherein the two transverse girders of said two supports are connected by at least one jack for the adjustment of their height difference, whereby each lifting and shifting action passes directly from the lifting and shifting jacks to the hooks and flanged roller wheels.