Abstract: An elongated structural member is erected with one or more similarly formed members. The ends are formed with a pair of angularly disposed chamfers each at a predetermined angle with the longitudinal axis, and having a tenon projection and a corresponding mortise. The tenon and mortise are disposed relative to each other in a respective one of said chambers, at right angles to each other, such that on joining said elements the tenons of one element fit within the mortise of the other element and the chamfered ends abut each other.

Abstract: This invention relates to a structural element for three-dimensional objects, e.g. furniture, said element having the shape of a longitudinal section, such that standard sections, mutually only differing in length, may be used for assembling the object. The section thereto comprises at least two longitudinal legs which include an angle, of which each leg is chamfered at its joining end with another of said elements at a predetermined angle with the longitudinal axis of the leg, perpendicular to the plane of that leg, such that the chamfering angles with the longitudinal axis of two legs of two sections to be joined to each other, which legs are in the same plane after the connection of the sections, are mutually equal, in which each leg of a section has at least one tenon projection and the element to be joined thereto having at least one corresponding mortise for receiving said tenon projection.The construction achieved by said sections is rigid without the use of additional fastening means.