Patent ID: 8794861

Claim:
A connecting device for connecting a first workpiece having an interior space to a second workpiece, said connecting device comprising: a clamping screw and a sleeve; the clamping screw having a shank which engages in a longitudinal groove of the first workpiece and which can be inserted into an opposing element in an interior space of the second workpiece; the shank of the clamping screw passing through the sleeve; said sleeve being provided with outer ribs and being fixed in the longitudinal groove of the first workpiece such that a threaded area of the clamping screw protrudes beyond a face of the first workpiece; said clamping screw being provided with a screw head; the threaded area of the clamping screw having a nut screw head which can be fitted thereon; said nut screw head being designed such that said nut screw head can be inserted into an undercut longitudinal groove of the second workpiece; the sleeve having at least three groups of said outer ribs which are parallel to a longitudinal axis of the sleeve; said outer ribs, in a fixing position, being assigned to radial grooves in a groove bottom and in facing surfaces of the longitudinal groove; and wherein one of said outer ribs is approximately triangular in cross section and merges with its rib faces into shaped channels of a sleeve outer face.