plate 13 the clamping lever 30 is movably screwed on the other long threaded bolt 25 of the locking bar 28 the clamping lever 30 is tightened and loosened for unlocking and locking the profile frame 7 the central profile frame 7 is mounted as follows the upper hinge 38 is screwed on at the z plate 13 the profile frame 7 is pivotably suspended by the upper hinge 38 via slot 52 similarly the lower hinge 39 is also pivotably inserted into a slot 52 of the profile frame 7 the lower hinge 39 is screwed on at the z plate 13 the upper profile frame 7 is mounted by pivotably attaching one of the long threaded bolts 25 of the locking bar 28 at the upper hinge 40 via a slot 52 the pre assembled upper hinge 40 is screwed on with the locking bar 28 at the z plate 13 the profile frame 7 is pivotably suspended in the upper hinge 40 via slot 52 the lower hinge 41 is pivotably inserted into the profile frame 7 via slot 52 the lower hinge 41 is screwed on at the z plate 13 the clamping lever 30 is movably screwed on the other long threaded bolt 25 of the locking bar 28 the clamping lever 30 is tightened and loosened for locking and unlocking the profile frame 7 at the upper profile frame 7 at the top a latch holding angle 26 is screwed.