Abstract: A structural joint assembly is provided between perpendicular beam members. One of the members includes a U-shaped channel having longitudinal ribs projecting inwardly from the sidewalls thereof, and the other member includes a plate extension on one end thereof projecting into the channel of the first member transverse to the axis thereof. The side edges of the plate are notched to receive the ribs of the first member, and the sidewalls and/or bottom wall of the channel are provided with opposed resilient tabs engaging opposite sides of the plate. The ribs and notches interengage the two members against separation, and the tabs position the second member longitudinally with respect to the first member.

Abstract: A structural member for use in forming frames by having connected thereto an associated member carrying a mounting stud having a shank with an enlarged head thereon, the structural member including a plurality of clover-leaf shaped holes in alignment therealong for receiving the mounting stud, each of the holes including four cusps arranged therearound with the edges of adjacent cusps joined by concave surfaces, at least one of the concave surfaces extending downwardly with the associated cusps disposed generally horizontally when the structural member is in its operative position, the cusps each having a generally vertically oriented straight side with opposed ones of said straight sides being joined by one of the concave surfaces at the bottom ends thereof, the straight sides converging toward the associated concave surface and being spaced apart at the points of the cusps a first distance slightly less than the diameter of the shank of the associated stud with the points of the cusps being spaced from the

Abstract: A fixing member on a support having a noncircular receiving orifice and having two flat faces, comprising two supporting portions coupled to each other by a rigid rod and spaced apart by a distance equal to the thickness of the support, the first portion having an apparent contour equal to that of the receiving orifice and having two axes of symmetry, the second portion comprising at least two locking bosses for the fixing member rigidly fixed to an elastic member, each of said bosses having an external contour the form of which is complementary to two diametrically opposite parts of the internal lateral face of said orifice, the assembly of said bosses having a plane of symmetry passing through the longitudinal axis, said plane of symmetry forming with the corresponding plane of symmetry of the contour of the first portion an angle equal to a fraction of a turn of predetermined value.

Abstract: The tool holder is provided with a setbolt having a T-shaped cross section head including a rectangular end plate which fits into a T-shaped cross section slot in the associated tool providing ease of tool assembly and disassembly for servicing and sharpening. The tool holder and the tool are similarly shaped to provide a smooth exterior surface for the assembly which does not have cavities and pockets causing troublesome accumulations of chips and splinters.

Abstract: A twist lock connector for use in connecting and disconnecting components, such as knock-down furniture components, and being characterized by a construction which provides easy selective progressive friction locking and unlocking thereof to a selected degree by opposite relative right-hand or left-hand rotation of a correlated amount.