Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Three-dimensional space-defining
Patent
1998-02-20
2000-10-03
Chilcot, Richard
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Three-dimensional space-defining
527312, 527332, E04B 124
Patent
active
06125603&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to metal supporting structures which are used in the field of metal structural work in the broadest sense, including the following types: hoardings and anchor bolts
Single and composite sections may be made with different geometries but of the same types, permitting the use of fixing devices without the need to drill or weld the sections.
BACKGROUND ART
GB-A-1503588 discloses a structural profiled element, obtained by the assembly of two or four simple profiled elements. The fixed member discloses in GB-A-1503588 does not serve as a connection means between the simple profiled elements in order to assemble the structural profiled elements.
GB-A-1503588 discloses a structural profiled element, obtained by the assembly of two or four simple profiled elements. The fixed member disclosed in GB-A-1503588 does not serve as a connection means between the simple profiled elements in order to assemble the structural profiled elements.
Metal structures comprising cold-formed sections which may be single or composites of elementary sections, as well as fixing devices for connections, joints or special pieces, are disclosed in Italian patent application CT92A 000016 of 04.05.1992. A metal supporting structure of the aforesaid type comprises: elementary sections, which are permanently assembled together to form continuous longitudinal slots with their longitudinal edges facing inwards and each inclined with respect to the opposite edge so that they converge inwardly; with walls inclined in the same way as the said edges, and one or more locking plugs or plates which also have lateral walls inclined in the same way as the said edges; the devices may be fixed along the said slots to grip the edges by screw means between matrices and plugs, with a preliminary one-off operation of deformation of the edges--which are originally rectilinear--using the matrices and plugs.
DISCLOSURE OF THE INVENTION
The structure according to . the present invention is defined in claim 1.
In practice, the longitudinal edges of the elementary sections have the corrugations along their whole length.
The said corrugations are repeated at a constant interval corresponding to the interval of the multiple corrugations present in the walls of the matrices and in the lateral walls of the plugs.
The interval, the depth and the radii of curvature of the corrugations are proportional to the thickness of the sections, and therefore the forgings will have dimensions, intervals, depths and radii of curvature to receive the corrugated sheets according to the thickness of the sections.
Further characteristics of the invention are specified in the dependent claims.
The previous solutions mentioned above form the fastening by pressing the plug into the matrix until the edges of the elementary sections are deformed, creating a single fastening or key on a one-off basis, by means of lengthy and expensive operations, with structural limitations and with large sizes of certain elements.
According to the present invention, however, the corrugation of the edges of each individual preformed section is created directly during the production of the elementary sections, during the forming process and without any significant additional costs.
This has many considerable and evident advantages, including the following.
The forgings, in other words the plugs and matrices, can be made lighter since they do not have to withstand the stresses produced in the phase of stamping the key, which would be done in the prior art by deforming the rectilinear edges of the sections; consequently, the dimensions of the screws subjected to the stresses produced by the stamping of the key into the edges of the section will also be reduced by a suitable amount, these screws being only required to withstand the forces of connection and not the (larger) forces of the cold deformation of the edges.
There is also a considerable saving of time in the assembly of the forgings (matrices and plugs), since it is no longer necessary to stamp the key into th
REFERENCES:
patent: 4069638 (1978-01-01), Hasselqvist et al.
patent: 4948313 (1990-08-01), Zankovich
patent: 5285615 (1994-02-01), Gilmore
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