Patent ID: 7549819

Claim:
A device in combination with a tool ( 52 ), the device comprising a first hollow profile ( 10 ) and a second hollow profile ( 10 a ) arranged approximately at right angles to one another, the first hollow profile ( 10 ) has a profile channel ( 14 ) concentric to a profile longitudinal axis (A) of the second hollow profile ( 10 a ) and also, in at least one profile side surface ( 20 ) of the first hollow profile ( 10 ), an undercut longitudinal groove ( 22 ) parallel to the profile longitudinal axis (A), wherein the first and second hollow profiles ( 10 , 10 a ) are held together by a connecting screw ( 30 , 30 a ) comprising a shaft ( 32 ) which engages in the profile channel ( 14 ) of the first hollow profile ( 10 ) and a screw head ( 36 , 36 a ) which is mounted in the undercut longitudinal groove ( 22 ) of the second hollow profile ( 10 a ), wherein the screw head ( 36 , 36 a ) is provided on its periphery with grooves or notches ( 43 ) which run in planes extending from the shaft longitudinal axis (M) and form ribs ( 44 ) between the groove or notches ( 43 ), the screw head ( 36 , 36 a ) is arranged in a groove space ( 26 ) of the second hollow profile ( 10 a ), and an insertion head ( 56 ) of the tool being integrally formed at one end of the tool in a round profile ( 54 ) to engage the screw head ( 36 , 36 a ), said insertion head having longitudinal notches ( 58 ) in its peripheral surface ( 57 ), wherein a protective section ( 66 ) of a protective surface ( 60 ) bears against the peripheral or outer surface ( 57 ) of the insertion head ( 56 ), said protective surface being releasably fixed to the round profile ( 54 ), wherein the protective surface comprises a protective plate ( 60 ) having a holding section ( 62 ), which is radial with respect to the axis (Q) of the round profile ( 54 ) and surrounds the round profile ( 54 ), and also a lateral section ( 64 ) which is bent out from the surface of said holding section, and the protective section ( 66 ) is integrally formed in an inclined manner with respect to the lateral section ( 64 ) to prevent damage to the second hollow profile ( 10 a ).