Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Reexamination Certificate
1999-03-22
2001-05-29
Kent, Christopher T. (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
C052S667000, C052S668000, C052S690000, C052S650300, C403S263000, C403S252000, C256S065080, C256S023000
Reexamination Certificate
active
06237299
ABSTRACT:
The invention concerns lattice girders constituted by elements rigidly interconnected so as to embody structures able to carry loads.
In known lattice girders, their constitutive elements are disposed according to the orientation of the loads to be supported and their distribution. These elements are generally interconnected by means of welding.
One of the applications of these structures is for forming walkway load-bearing guard-rails and in particular a suspended walkway so as to connect the load of a floor to linking or carrying straps.
The present invention concerns embodying these lattice girder structures to in particular form walkway guard-rails with the aid of weldless assemblies.
This solution is advantageous in that it is able to reduce production costs and eliminate the stresses inherent in the welding technique. In fact, the structures concerned are preferably made of aluminium, given the fact of the weight gain obtained by the use of this material.
Now, especially as regards aluminium, the welding technique has harmful and costly consequences. The welding operation results on the zone in question in a partially neutralising annealing effect, but more particularly the elastic limit improvement obtained via the heat treatment of the quality of aluminium used for this purpose.
The lowering of the resultant elastic limit requires that the size of the components used be increased, thus increasing costs.
In addition, any weld increases the risks of corrosion and, so as to limit these risks, requires that a costly strict quality control procedure be set up, the cost of this being added to the cost of employing a qualified technician.
The document EP-A- 0 577 096 concerns a lattice girder made up of hollow beams assembled with solid crossbeams having an I-shaped profile. Each beam comprises a longitudinal aperture with a width corresponding to the central core of the crossbeam and in which the oblique crossbeam is able to slide without being locked at a particular point of the beam. The embodiment of a lattice girder according to this document has the drawback of then requiring that the number of crossbeams, their inclination and the length of the beams being such that each crossbeam stops against the adjacent crossbeams, the extremities of the end crossbeams being positioned at the extremities of the beams. In addition, it is essential that a device (not described elsewhere in this document) locks the unit at these extremities.
The lattice girder structure of the invention is made up of an assembly of interconnected elements via the embedding of projecting portions of some of the latter in portions forming housings receiving the latter and wherein its structural elements are solely constituted by hollow homogeneous profiles having cuts for embodying links via embedding by which the embedded portions laterally self-lock with the portions receiving them.
The assemblies of the invention are therefore embodied so as to satisfy the load stresses applied to them forcibly in a particular direction whilst ensuring the rigid linking of the components.
These assemblies can be completed by members, such as rivets or other elements, so as to keep them in their definitive position, although for the most complete embodiment of the invention, these additional members are not essential.
The assemblies of the invention are configured so as to vary according to the assembling angles, a right angle assembly being merely one case of application.
According to one particularly advantageous embodiment of the assembling technique of the invention, the elements receiving the portions embedded from the other elements are formed of two half-elements with one applied longitudinally against the other and rendered integral by an appropriate linking device so that the embedded portions can be introduced prior to assembling of the two half-elements in the corresponding openings of the latter, and, after said half-elements have been assembled, are locked there longitudinally by cuts made on two parallel sides of the embedded portions according to an angle with the axis of each embedded element corresponding to the assembly axis of the latter with the receiving element, the section of the embedded portion for this purpose being suitably dimensioned.
The linking member rendering integral the two half-elements of each beam is embodied by a hooking structure integrated with each beam half-element, the two hooking structures being opposite each other with one corresponding to the other so as to render the two half-elements integral by one pressing against the other.
The girder embodied according to the invention by the above-mentioned assemblies can be fitted with vertical extremity jambs making it possible to secure it to a walkway floor module so as to form a walkway or walkway module.
To this end, a type of assembly can be embodied in which the horizontal beams of the girder each receive at their extremities a notched extension for receiving via vertical engagement at least one partially open stanchion whose lower portion, after being placed, is fixed to a structural floor element so as to embody a walkway or walkway module.
REFERENCES:
patent: 1376150 (1921-04-01), Miller
patent: 1453114 (1923-04-01), Rapp et al.
patent: 2514607 (1950-07-01), McLean
patent: 2668606 (1954-02-01), King
patent: 2860743 (1958-11-01), Cliff
patent: 3155202 (1964-11-01), Milette
patent: 3686819 (1972-08-01), Atkinson
patent: 3927950 (1975-12-01), Herrmann et al.
patent: 4027855 (1977-06-01), Lauzier
patent: 4102108 (1978-07-01), Cody
patent: 4485597 (1984-12-01), Worrallo
patent: 4532749 (1985-08-01), Perk
patent: 4586310 (1986-05-01), Baril et al.
patent: 4761930 (1988-08-01), Tepera
patent: 5417028 (1995-05-01), Meyer
patent: 5437136 (1995-08-01), Triebel
patent: 5606837 (1997-03-01), Holizlander
patent: 5644888 (1997-07-01), Johnson
patent: 5867963 (1999-02-01), Hershey
patent: 5899042 (1999-05-01), Pellock
Drucker William A.
Kent Christopher T.
Societe d'Etude et de Construction d'Appareils de Leva
Thissell Jennifer I.
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