Support frame

Claim 1

A supporting frame comprising support or column elements and cross-beams, said cross-beams being built in between two column elements located opposite each other in one plane, the cross-beams, at least at their ends, being provided with a cavity for receiving expanding elements guided to move in a longitudinal and transverse direction, said expanding elements being spaceable from each other by being displaceable longitudinally and laterally between a parking position and a clamping position, and are further brought in pairs into and out of engagement with said support or column elements, said expanding elements having a head piece comprising clamping means which may be pushed into said cavity, and may be forced apart by means of a tightening screw which is operable from the outside of said cross-beam, characterized by at least one guide pin fixed in one of the expanding elements and one guide pin slidably movable in the other of the expanding elements for parallel guidance and coupling of said expanding elements, whereby at least one guide pin engages by means of elongated holes into the corresponding sides of said cross-beam so that the route of the longitudinal travel of said expanding elements is defined by the end limitations of said elongated holes and there is achieved a frictional engagement between said cross-beam end and the surface of said column element.