Abstract: Device for connecting plate members or similar constructional parts by means of connecting elements. Each connecting element consists of two pivotably connected component parts.At the area of connection, each plate member is enclosed by two such component parts of different connecting elements. The component parts of the connecting elements are provided with holes into which fastening means. e.g., fastening screws, are inserted. Before the screws are tightened the relative angular position of the plates is adjusted as desired. Thereafter screws are tightened to firmly connect the plates with the component parts and immovably hold the plates in their desired angular positions. The plate members are thus rigidly connected with one another at any desired angle.