Abstract: A space frame support structure for highway signs comprises upper and lower chord members; a plurality of weld-free, single-cast connectors attached to and spaced along the respective length of the chord members; a plurality of diagonal members disposed between the upper and lower chord members in a series of “V”-shaped configuration connected end-to-end, each diagonal member forming a leg of a respective “V”. Each leg including a bottom end portion and a top end portion. The bottom end portion is attached to a respective connector attached to the lower chord member. The top end portion is connected to another connector attached to the upper chord member. A plurality of pins are carried by each connector to secure each connector to the upper or lower chord member and to the respective bottom or top end portions of the diagonal members.

Abstract: A customizable enclosable frame assembly for providing a housing structure comprising an arrangement of elongated members connected by a plurality of connectors to define the frame assembly. The connectors include a plurality of knuckle joint assemblies for articulably connecting the elongated members. The connectors also include a plurality of slip-T members for connecting the elongated members to define a customizable, adjustable base of the customizable frame assembly.

Abstract: A connecting system for modular furniture structures includes an upright element with outer square cross-section giving the upright element four sides and four corners, featuring a trapezoidal or dovetail section longitudinal groove on each side. The longitudinal grooves gives the upright element longitudinal corners a quasi trapezoidal or dovetail shape. Trapezoidal connection small blocks are slidably inserted into the grooves and “C”-shaped clamps are slidably mounted along the longitudinal corners. Pin rods are fitted to both the trapezoidal connection small blocks and the “C”-shaped clamps by means of a threaded section forming also locking means for fixing the small blocks and clamps along the grooves and the corners. The pin rods have a circular groove all around and are introduced into bored small blocks fastened to furniture complementary structural elements and are fixed by means for threaded dowels set in engagement with the circular grooves.

Abstract: This purpose is achieved according to the invention in that the connection element has several jaw sidewalls that are oriented in different directions, whereby 2 jaw sidewalls at a time can be braced against each other to receive a component part, in that at least one jaw sidewall can be set so that it is adjustable on the connection element and this jaw sidewall projects by a lateral leg into the inside of the connection element and there is in active connection with an adjustment element that is to be activated from the outside in a direction to brace or detach the jaw sidewall. With the connection element according to the invention, it is possible to connect the plates of a shelf construction system together without nails, screws and the like.

Abstract: A coupling apparatus is comprised of three couplers for interconnecting three scaffolding members. The locking devices for the couplers may be of a bolt-and-nut configuration or, advantageously, of a wedge and arm, tapered circular wedge and arm or over-centre hand-lever.

Abstract: A pipe fitting of the present invention comprises a combination of a plurality of split fittings and has a central cylinder and an extended cylinder which outwardly projects from the central cylinder, the central cylinder and the extended cylinder being capable of receiving pipes from orthogonal directions with respect to each other. The extended cylinder includes a bolt hole which locates near the central cylinder and which penetrates the extended cylinder. The central cylinder has an aperture provided in a side surface thereof. Each split fitting is fixed on the pipes by a bolt and nut via the respective bolt hole.

Abstract: A light-weight, portable display system which includes plural, hollow, plastic panels having uniquely contoured corners. The panels may be of flat or curved configuration. Most of the plastic panels are fabricated to present smooth front and rear faces. However, some panels are made with at least one slotted face for supporting shelves therein. Straight plastic connector components are designed to accept the corners of the panels, thereby connecting the panels in a manner to form a display area. Hinged plastic connectors are provided so that adjacent panels may be arranged at angles ranging from ninety to one hundred eighty degrees.

Abstract: A spherical joint for coupling three or more links together at one point. The joint includes a bail and a hollow spherical body wrapping the ball therein. The ball is movable in the hollow spherical body. An upper link inserted into and fixed to the hollow spherical body through an upper link insertion opening formed on the hollow spherical body. Lower links are connected to the hollow spherical body through lower link insertion openings, wherein the number of the lower links correspond to that of the hollow spherical body. Link support discs are set within a gap between outer surface of the central ball and inner surface of the hollow spherical body and fixed to each end of the lower link, and all the axes of the lower links and the upper link are coincident with a center point of the ball.

Abstract: A corner bracket comprising of two matching components held together by two bolts wherein as the two bolts are tightened, the two matching components will be urged toward each other thereby securely gripping a planar surface that is inserted between them. Another bolt is inserted through an opening in the second component through a threaded hole in the first component and protrudes into a hole in the first component where the vertical supporting member is inserted. The bolt will securely lock the corner bracket with the planar surface to the vertical supporting member inserted through the hole in the first component. The advantage of the present invention is that the force of the grip on the planar surface can be adjusted independently of the force of the grip on the vertical supporting member. Another advantage of the present invention is that the corner bracket can be used to secure a variety of planar surfaces with a relative large range of thickness.

Abstract: A storage unit assembly kit comprising only two types of rectangular panel pieces are repetitively interlocked to form a storage array for miniature toys. The first type of panel piece includes enlargements at each corner pierced by a first and second aperture extending completely across the plane of the panel. The second type of panel piece, in turn, includes a first and second set of posts extending laterally in the panel plane for insertion in the respective ones of the apertures. The second type of panel piece may also include a bounding barrier generally dimensioned to receive and confine the toy therebetween.

Abstract: A plurality of mounting feet securely attach a power inverter to a body. The tabs are to be adjustably or pivotally mounted on the under carriage of the power inverter such that they may be positioned by the user when mounting to a body. When mounted, the tabs absorb vibrations from the host body and prevent the power inverter from resulting damage. During shipping or storage the tabs are retracted to the underside of the power inverter to minimize space required by the power inverter. The tabs are made from elastomeric electrical insulator material in order to ensure a proper ground is maintainer as long as the power inverter is secured via the tabs.

Abstract: A programmable smart membrane and methods therefor. The smart membrane conducts an overall function on at least one of a sorting function, a filtering function and an absorbing function of at least one object having an attribute. The smart membrane includes a plurality of module units disposed adjacent each other. Each of the plurality of module units obtains information from an environment around each of the plurality of module units. The plurality of module units also each perform a function based on at least a first control method that determines the function based on the information for each of the plurality of module units. Wherein the plurality of module units individually perform function to collectively perform the overall function of the membrane based on the attribute of the object.

Abstract: A device for the releasable, adhesive-free connection of at least two—in particular flexible—articles (6) in sheet form—in particular sheets of paper and/or pieces of card and/or photographs, wherein the device has at least two clamping means (2)—preferably arranged at different ends of the device—for receiving the articles (6) in sheet form.

Abstract: A fence system, using extruded bars of T-shaped cross-section to form posts and rails, and a plurality of connectors to connect the T-bars. The connectors have vertical and horizontal V-channels within which the T-bars are secured. Each V-channel has a pair of sides which meet at a vertex, and an open end. A plurality of clamping mechanisms each include a cross plate which extends across the open end of the V-channel to hold the T-bar therein, and a pair of J-bolts which secure to both the V-channel sides and the cross plate. An inverted U-channel extends between the cross plate and the T-bar to directly engage the T-bar and hold it tightly against the vertex of the V-channel. The T-bar has a plurality of spaced protuberances thereon. A transverse pin extends across the U-channel so that when the clamping mechanism is engaged with the T-bar, interference between the transverse pin and the protuberances prevent the T-bar from slipping longitudinally within the V-channels.

Abstract: A fastening device for a glass panel (2) on a wall (3), a building-side substructure, or similar object, such as a building facade, using a clamp fitting (4) that grips the glass panel (2) and a holder (5) that is supported on the clamp fitting (4) so that it can move to a limited extent in three dimensions. The invention teaches that the holder (5) has a retaining pivot (6) that can be fixed in position on the clamp fitting (4), whereby on the outer free end (7) of the retaining pivot there is a connecting articulation (8) that can be fixed in position for the connection of a compensating shaft (9), which on its end (10) farther from the retaining pivot (6) is connected by means of an articulation (11) that can be fixed in position with an adapter (12) for fastening to a wall (3), a substructure or similar object.

Abstract: A fastening device for a glass panel (2) on a wall (3), a building-side substructure, or similar object, such as a building facade, using a clamp fitting (4) that grips the glass panel (2) and a holder (5) that is supported on the clamp fitting (4) so that it can move to a limited extent in three dimensions. The invention teaches that the holder (5) has a two-arm (arms 8) connecting bridge (6) that can be fixed in position by means of a center retaining pivot (7) on the clamp fitting (4) whereby, on the outer free ends (9) of the connecting bridge (6), there are connecting articulations (10) that can be fixed in position for the connection of respective compensating shafts (11, 11′), which are connected on their ends (12) farther away from the connecting bridge (6) by means of respective articulations (13) that can be fixed in position with an adapter (14) for fastening to a wall (3), a substructure, or similar object.

Abstract: A foldable member in the shape of a tube with at least one predetermined hinge area along the length of the tube, and a plurality of opposing elongated slots in the tube at the hinge area thereof forming separated longitudinal strips of tube material between the slots which fold when subjected to localized buckling forces. A collapsible structure constructed of such foldable members.

Abstract: A tubing connector adapted to receive portions of a plurality of elongate substantially rigid tubes and to hold them in a defined angular relationship relative to each other. The connector has a body with a plurality of tube-receiving and holding apertures formed therein. Stop elements in the apertures spaced inwardly from the mouths of the apertures limit the extent to which end portions of tubes may be inserted longitudinally into the body.

Abstract: A first connector is accommodated in a connector housing, with a first connection member lying down relative to the first terminal. The first connection member is raised relative to the first terminal. The first connector and a second connector are stacked to be connected each other.

Abstract: A system and method for transiently connecting modular elements of a self movable robot. The self movable robot is known as metamorphosing robots, polymorphic robots, shape changing robots, or morphable structures. The modular elements can act together to build a structure to perform a given task. Each modular robotic module contains a mechanism allowing for communication and transfer of power between adjacent modules, and defining a robot whole to be all the modules in one connected component.

Abstract: A universally compliant and restorative internodal connector architecture system wherein a plurality of nodal members are interconnected by a spring and strut assembly in a manner that permits manual or actuated relocation of the nodal spacial definition using standard modules.

Abstract: Disclosed are frame-connecting members such as straight, straight-curved, T-shaped and cross-shaped connecting members being used when assembling or fabricating vinyl houses, etc, and method for manufacturing the same. The frame-connecting member comprises a first connecting part, having a metal pipe shape, which connects a frame of a first direction, a second connecting part, having a metal pipe shape and corresponding to the first connecting part, which connects a frame of a second direction, and a fixed part, placed between the first connecting part and the second connecting part and molded with the molding material of a synthetic resin, which connects the connecting parts.

Abstract: A rack for a switch cabinet includes rack members and corner members with connecting projections thereon insertable into connecting receptacles on the rack members. Each rack member, symmetrical about a diagonal plane therealong, is in the form of multiply-curved, open hollow profile sections which form a pair of the connecting receptacles to receive the connecting projections extending from the corner member.

Abstract: The invention relates to the manufacturing of structural members which are extremely light but can be highly stressed and are designed as a framework, mainly in the field of aviation but also in other technical fields where the framework supports, as large-volume components, are to have a weight that is as light as possible. Sleeve connectors are provided which are designed so that the tubes to be connected to a framework node are covered in a form-locking manner by means of sleeve parts of a sleeve connector which can be glued adjacent to one another on the nodal point, the whole nodal point with all tubes entering at this point being enclosed by the parts of the sleeve connector.

Abstract: A joint for use in forming a three-dimensional framed spatial structure for interior use and construction comprising three identical shaped surfaces or wings resembling the corner of a cube, each of the three identical shaped surfaces (4, 5 & 6) comprised of two different segments: the first an L-shaped segment with one hole at the intersection (23) and two holes on each arm of the "L" (26 & 27); the second segment comprising a sector of a circle whose arc measures ninety degrees (4) with a hole in the center (32) to permit attachments. These two different segments are connected on the inside surface (surface A) by a forty-five degree angle and on the outside (surface B) by a ninety-degree angle. Multiple connections and attachments can be made through the four predetermined holes (23, 26, 27, 32) located on each of the three identical shaped surfaces (4, 5, 6).

Abstract: A crossmember defines guide surfaces to receive a leg tip. Preferably a screw, cam or lever applies nonimpulse force to wedge the tip against the surfaces. The tip is preferably unthreaded, exclusively noncircular in at least external cross-section, and very generally aligned with the leg axis. Preferably the screw or the like pulls the tip length-wise into the crossmember without rotating or threading the tip into the surfaces, and also retains the tip wedged in place. Also preferably a notch or analogous traction feature is formed in the leg or crossmember, and the screw (distinct from the tip) threaded to the other. The screw engages the notch to force the tip into the crossmember.

Abstract: A framework, in particular an at least partially hollow framework, has nodes and members. The nodes are formed by at least a projection on a hollow framework member and by at least a further hollow member mounted and secured thereon. Also disclosed is a process for producing this framework and its use in land, air and water vehicles, in building construction, in civil and underground engineering, scaffolds, shelving systems and furniture.

Abstract: A connector for creating exhibits having one piece including a series of grooves (used for connecting panels) arranged at fixed angles with respect to each other. The connector also includes a second piece that is trapped within the other piece. The second piece has a groove that can be arranged at a range of angles with respect to the other grooves.

Abstract: A connection system for connecting struts formed from paper or paper-like sheets rolled into a tube is made of cylindrical receptors and connectors. Each cylindrical receptor has an inside diameter approximately equal to or slightly smaller than the predetermined outside diameter of the tube for friction-fit engagement onto the end of the tube. Each cylindrical receptor also has a finger which is centrally disposed within the receptor, about the longitudinal axis thereof. At least a part of such finger is substantially the same size as the inside diameter of the tube. The finger is made of a plurality of longitudinal ribs extending radially from its longitudinal axis. Each receptor is press-fit engageable with a connector. Each connector is press-fit engageable with at least two receptors. The connection system allows for the connection of struts which can be readily constructed by the user of the construction system.

Abstract: A strutural connector hub for an exhibit booth. The connector hub provides for a double friction fit connector to secure various components together in place and further provides for a lock to additionally secure various components thereto.

Abstract: A flexible tie strut for supporting both compressive and tensile forces, the flexible tie strut includes a tension member and a coaxially mounted compression member, the compression member and the tensile member are interconnected at their respective ends. A coupler for interconnecting flexible tie struts, and a system of couplers and struts are also disclosed. Additionally, wheels are disclosed that have axles having both male and female connection means.

Abstract: Pultruded composite members which interfit to form a rigid post and beam, or beam and brace, are adapted for use in heavy construction in such applications as bridges, buildings including high rise structures, ship deck and the like. Two pultruded shapes are used for the entire framework. A first member ordinarily serving as a beam is pultruded as a completely enclosed thick-walled I-beam with an internal channel which is formed with a continuous scalloped or toothed cross-section on both sides. The mating support member has a bifurcated end with outer sides configured to interlock with the sides of the internal channel of the I-beam. Access into the channel is provided by periodic windows milled into the beam at the precise entry points of the insertion member. The bifurcated end of the insertion member compresses adequately to be inserted into the channel of the cross-beam, where it expands such that the external teeth engage the scalloped walls of the I-beam and lock securely into place.

Abstract: An article of furniture such as a table has a leg joint formed substantially from a triangular bracing attachment structure coupled between the top of a leg and an underside of the planar top. The top of the leg is not coupled to the planar top directly, the structure forming a triangular brace having an apex at the top of the leg and two apices on the underside of the top, where diverging brace members coupled to the leg are attached. The brace members are disposed in perpendicular planes (e.g., parallel to the edges of the top, such that the triangular brace effectively leans inwardly. Side support members couple adjacent leg joints and provide tension or compression to resist the tendency of the leg to be diverted in a direction perpendicular to the plane of the triangular brace. Preferably the side support members are spaced below the underside of the top, and attach to the joint brace structure but not directly to the leg or to the opposed side support brace.

Abstract: A joint device enables to join a brace member, into which regulated pretension is exactly introduced, to unmovable connector nodes, comprising a steel rod 1 having a swelled portion 1A and a threaded connector portion 1B formed on the end thereof, respectively, one sleeve 3 providing an external threaded part 3A joined to one node 2M, which contacts a swelled portion 1A: and another sleeve 4 providing an external threaded part 4A joined to node 2N, which engages threaded connector portion 1B. The length from a node-contact face 3c of sleeve 3 to a node-contact face 4c of sleeve 4 is selected equal to difference of length between both nodes 2, 2 from length for generating a preferable elongation enough to introduce regulated pretension into steel rod 1.

Abstract: A highly rigid structure is provided using six struts connected at three er and three lower nodes to upper and lower support structures. The joint assemblies are formed by half-spherical balls attached to the ends of each of the struts, and retained within cylindrical apertures, such that the center lines of the struts intersect at the nodes. Bending loads on the struts are thus eliminated, while the design and construction of the structure is substantially simplified.

Abstract: A framework connector comprises a main body having a hemispherical surface with a plurality of non-circular projections extending outwardly from the hemispherical surface. Each of the projections have at least three longitudinally extending, circumferentially spaced land areas. Two of the three land areas are relatively closely spaced and define a projection surface therebetween. Another of the land areas is located opposite the projection surface. A post extends vertically outward from the projection surface. Each connector includes an elongate tubular member for connecting one connector to another connector. The tubular member has an inner diameter selected to slidingly engage the land areas of the projection when the member is inserted over a projection. The tubular member has a hole for receiving the post for releaseably coupling the member to the connector.

Abstract: A panel connection assembly for providing a tight fit between a pair of panels for a pleasing seamless effect. A pair of elongate first connector members are connected to the panel edges respectively. An elongate second connector member has a narrow central portion and a pair of enlarged portions between which the central portion extends. Each of the first connector members has an opening including a throat opening into an enlarged inner cavity. The openings of the first connector members together have a complementary shape to that of the second connector member for receiving the central portion in both of the throats and the enlarged portions in the cavities respectively for connecting the panels. Fabric covers the outer sides of each panel.

Abstract: A loft connector joint employed in the construction of lofts includes a hub having a first end, a second end, an outer periphery, and an axial core oriented along a longitudinal axis extending from first end to the second end. The axial core is hollow and configured for slidable engagement with a post of a loft. A plurality of sockets are positioned about the outer periphery of the hub and facing outward from the center of the hub. Each of the sockets are configured for slidably receiving and retaining an edge of a panel of a loft. The second end of the hub has a plurality of ramps. A removable cap may be secured to the hub. The cap is bowl-shaped and has a domed top and an outer wall. A plurality of tabs extend from the underside of the cap, and the tabs are deflectable radially inward from the center of the cap. When the cap and hub are coupled together, corresponding tabs and ramps contact each other during rotation of the cap in relation to the hub.

Abstract: A coupling for a modular construction system whereby a tubular element is linked to another element, or is supported, characterised by: 1) at least one cup-shaped unit (P, 22, 41, 61, 81, 102) having an open end (16) and a reduced end (12); the open end (16) serving to received an end (E) of a tubular element (T) to enable the end (E) to be pushed to a rest position (18) at the reduced end (12) of the cup-shaped Unit (P), and locking means (30) enabling a tubular element end (E) to be retained against further movement relative to the cup-shaped unit (P); the length (L') of the unit (P) being between one and one half and twice the outside diameter (D) of the tubular element (or of the major transverse dimension of the tubular element if it is of non-circular cross-section); and an aperture (13) at the reduced end (12) of the cup-shaped unit which is no more than one-half the maximum interior diameter (I) or maximum interior dimension of the cup-shaped unit (P); 2) the or each cup-shaped unit (P, 22, 41, 61, 81

Abstract: A connector for a studded T-post comprises a tube having an internal keyway therein. The keyway slidingly receives a studded T-post and is configured to prevent relative rotational movement of the post within the tube when the post is inserted into the tube. A locking member passes through the tube and cooperates with studs of the T-post to inhibit longitudinal movement of the T-post within the tube. A second similar tube may be attached to the first tube such that two T-posts may be inserted in the respective tubes and supported relative to one another in any number of angular orientations, thereby providing support for a wire-formed trellis.

Abstract: A double steel pipe structural member comprises an external pipe and an internal pipe. The external pipe is provided with a thin steel pipe part and thick steel pipe parts formed at each of the ends of the thin part. The thickness of the thick part is 1.5 to 1.7 times the thickness of the thin part. The internal pipe is disposed so as to overlap not only with the thin part but with the thick part of the external pipe. The internal pipe behaves as a bending resistant pipe against the external pipe so that the external pipe may deform plastically in the longitudinal direction thereof after an axial compressive force exceeds the yield strength of the external pipe. The deformation is axially symmetrical along the outer surface of the internal pipe. A truss structure including the double steel pipe, is prevented from immediately collapsing when a building having the truss structure encounters a big earthquake or the like.

Abstract: A joint device has a fastening bolt provided with a first external threaded part to engage a screw hole of a node, a polygonal boss slidably engaged with a sleeve, a third external threaded part and a second reversely threaded part engaged with an anchor nut in a steel pipe. The third part engages with an internal threaded part on the inner face of a bore in an end cap welded on the end of the steel pipe so that the first part can be advanced to the node or retracted into the sleeve. The sleeve has a stopper on the corners of the polygonal hole thereof so that it is prevented from coming off the fastening bolt. The device enables a connection of a steel pipe and a node even where the pipe is inclined or perpendicular to the ground.

Abstract: A metal connector includes a main metal member in the form of a tube which may be passed through a hole formed in a wooden member, a stop welded to one end of the main metal member, elongated holes formed in the lateral sides of the main metal member in the vicinity of its other end so as to permit a pin to be passed through it, and a tightening bolt threadedly engaged in the other end of the main metal member so that its distal end abuts against the pin. Alternatively, a metal connector includes a through-hole formed in the lateral side of the main metal member in the vicinity of its one end so as to be passed through by a bolt, and a tightening bolt threadedly engaged in the other end of the main metal member so that the distal end of the bolt is abutted against the pin when the bolt is tightened. Consequently, the wooden members of a construction may be connected easily and tightly to one another, while the mounting of the metal connector may be simplified with a view to improving the operating efficiency.

Abstract: A knockdown chair for children easily assembled and disassembled, and maintaining a desired connection strength for a long time. The knockdown chair comprises a square seat plate having an insert projection on its side surface, a plurality of support beams engaging with and surrounding the seat plate by reception of individual insert projections of the seat plate and each having a reception slit at its side surface and a pair of reception holes on its opposed ends, a plurality of connection members connecting the support beams to each other at corners of the seat plate and each having three inserts in order to be coupled not only to corresponding neighbor support beams but also to a leg member, and the leg member coupled to the connection member for supporting the seat plate and the support beams. The reception slit and the reception holes of the parts of the chair are preferably provided with elastic soft layers made of a soft synthetic resin material for facilitating assembly and disassembly of the chair.

Abstract: Several cylindrical studs radiate from a spherical central hub to form a connector for joining adjacent ends of tubular structural members. The connector has six orthogonally arranged studs each sized to be fitted in an end portion of a structural member. The connector is formed in two identical halves secured together along a central plane bisecting four of the studs. The hub of the connector has a continuous peripheral wall, and the studs have tapered walls decreasing in thickness from such continuous peripheral wall outward toward the free ends of the studs. In a desired framework construction, one or more of the studs can be cut off without exposing the interior of the hub or jeopardizing the strength of the connector.

Abstract: This invention provides a double-bar connecting device which in one embodiment includes a cubic connector housing having three pairs of mutually orthogonal opposing surfaces. Each surface has two holes passing through to allow elongated bars having the same cross-section as the holes to snugly and tightly extend through the connector housing. Bolts may be provided to further secure the elongated bars to the connector housing. By positioning a number of such connector devices together with the elongated bars extending between connector housings, a three-dimensional frame structure is provided.

Abstract: A tensioning device for the canvas of a light shelter in the shape of a tent on a supporting structure. The structure comprises a plurality of inclined bars whose lower ends are supported by anchoring device formed of a frame, maintained at a distance from the ground by supporting posts, at least two bars being connected at their respective upper ends by a rigid linking element which is connected to the upper end of at least one other bar by spacer device which is able to vary the distance separating the upper ends of the inclined bar in the horizontal plane in such a way as to cause a rotation toward the upper part of each bar around its lower end.

Abstract: A modular truss frame system which can be assembled in a variety of sizes and configurations includes a plurality of interchangeable tubular chord members, as well as a plurality of interchangeable tubular diagonal web members. A plurality of top node connection members join together predetermined ones of the top chord members in an end-to-end relationship. The top node members also serve to join one end of each of the web members to the ends of predetermined ones of the top chord members. A plurality of bottom node connection members are used to join together predetermined ones of the ends of the web members which are opposite the ends thereof that are joined to the top chord members by the associated top node members. The top chord members and the associated ends of the web members are connected to the top node, and the opposite ends of the web members are connected to the bottom node, by means such that each member is attachable to its respective node without rotational movement of the member.

Abstract: A space frame of double-layer flat grid type, in which the upper grid is skewed or angularly displaced by 45.degree. relative to the lower grid, has pairs of oblique struts (16) connecting the lower grid nodes (14) to the upper grid nodes (15). At a lower grid node (14) where two chords (10, 11) are superimposed, one pair of oblique struts (16) in a vertical plane through one chord (10) has a common terminal (17) between the two chords (10 and 11). A bolt (22) through the terminals (17) and the chords (10 and 11) secures the parts together. At the nodes (15) of the upper grid, the terminals (19) of the struts (16) are interposed between the superimposed upper grid chords (12 and 13) and secured by bolts (21).

Abstract: The invention concerns a joint piece cast out of steel for tubes of trusswork constructions, said joint piece comprising a frame tube and at least one branch. The end of the branch (5) is shaped so that, when it is cut at different angles, it can constitute a connecting head for the joining of a tube at different angles.