Ski box attachment

Apparatus for attaching a ski-box (10) to a roof-rack, having at least one longitudinal adjustment rail (1) for attachment to the bottom of a ski-box (10), in a longitudinal direction of the ski-box, and having at least one load carrier clamp (5) being displaceable longitudinally along the at least one longitudinal adjustment rail and being securable thereto for adjustably and securably receiving a load carrier member (9) of a roof-rack, said at least one longitudinal adjustment rail (1) being provided with a longitudinal groove (4) in which the at least one load carrier clamp (5) is displaceably guided and the at least one load carrier clamp (5) being formed of a U-shaped portion (6) for receiving the load carrier member (9) of the roof-rack and two mounting flanges (7) extended at a right angle outwardly from an end of a respective leg of the U-shaped portion (6), wherein at least one longitudinal adjustment rail (1) is provided with two displaceable and securable load carrier clamps (5) for adjustably and securably receiving front and rear load carrier members (9) respectively of the roof-rack, in that the load carrier clamps (5) are attached to the at least one longitudinal adjustment rail (1) by means of bolts (8) received in bores (14) of the mounting flanges (7) and extended into the longitudinal groove (4) of the at least one longitudinal adjustment rail (1) and engaged by nuts (13) displaceably provided within the at least one longitudinal adjustment rail (1), and in that internal depth (d) of the U-shaped portion (6) of the load carrier clamp (5) is smaller than external height (h) of the load carrier member (9), whereby a tightening of the bolts (8) of the respective load carrier clamp (5) causes on the one hand a clamping of the load carrier clamp (5) against the at least one longitudinal adjustment rail (1) and, on the other hand, a clamping of the load carrying member (9) between the load carrier clamp (5) and the at least one longitudinal adjustment rail (1).