Static structures (e.g. – buildings) – Facer held by stiffener-type frame – Facer attached between exposed frame members
Patent
1984-07-31
1986-05-06
Murtagh, John E.
Static structures (e.g., buildings)
Facer held by stiffener-type frame
Facer attached between exposed frame members
403374, 403358, 29155R, 29525, 29526R, 52775, 52781, 52665, 52693, E04B 158
Patent
active
045863105
DESCRIPTION:
BRIEF SUMMARY
French Pat. No. 2 226 029 discloses trellis-like metal constructions such as scaffoldings, frames or simply railings or parapets, constituted of profiles which are not assembled by welding, rivets or bolts, but rather by tongue and groove arrangements locked by keys fitted perpendicular to and sunk by force into the groove. The use of presses or calibrated jacks allows locking keys to be sunk in with well-defined force and assures a good safety coefficient for this type of assembly. Moreover, the key is generally provided with a shoulder which facilitates its driving into the groove and simultaneously limits this driving in and thus limits the deformation of the groove to a predetermined value.
Large constructions assembled rapidly and safely at the worksite are thus realized, even with inexperienced personnel.
However, it is to be noted that metal constructions using angled assembly of two profiles by groove, tongue and locking keys are hardly known, other than for trellis-like rectangular metal structures such as ladders, of which the rungs are assembled at right angles to the legs.
In fact, with these groove, tongue and key assemblies, the tightening applied by the key to the tongue assures sufficient jamming in the case wherein the constituent elements are subject to flexing, traction or compression. On the other hand, under the effect of reciprocal stresses, or vibrations, the tongue and the key slide along in the groove, one avoids using a force to support the assembly which has a component parallel to the generatrices of the groove. Because of this, trellis constructions having bars which are oblique to the flanges, which are assembled by a groove, tongue and locking key device, are hardly known.
The object of the present invention is a process and a device allowing oblique assemblies by groove, tongue and key, with a good safety coefficient, both transverse to the groove and also longitudinally along the groove generatrices.
The process of angled assembly of two profiles or structural members, according to the invention, consists of preventing any possibility of sliding of the tongue longitudinally in the groove and making one of the male elements or components introduced into the groove, i.e. either the tongue or the key of greater width than the other or having, a greater length than the other, in the direction of the groove generatrices, and giving one of the sides of the longer element a concave shape along its width, i.e. parallel to the groove generatrices. This side, instead of being essentially flat, is slightly curved inward at each end and the longer male element, instead of having a cylindrical shape of its generatrices parallel to those of the groove, is broadened at its two ends in the areas exceeding the length of the other male element. Thus, if one or the other of the two male elements or components tends to be moved along the groove, it is blocked by the enlarged end of the longer element. One has a sort of double key locking, the one, as in the prior art, locking perpendicular to the groove generatrices, and the other along these generatrices. This process thus leads to the realization of angled assembly devices of two profiles or members by fitting of a tongue into a groove which is integral with one of the profiles or members, the tongue being integral with the other, then locking of the tongue in the groove by a key which is sunk perpendicularly into the groove. To avoid longitudinal sliding of the tongue and key in the groove despite their force locking, one of the male elements of the assembly, the tongue or the key, is longer than the other, in the direction of the generatrices of the groove. One of the sides of the longer male element also is of concave shape along its length.
In the contact zone between the two male elements, tongue and key, the contact surfaces of these two elements are generally flat, and it is only beyond this flat contact zone that the surface of the longer element becomes concave at each end, allowing each of the ends of this longer element to be prog
REFERENCES:
patent: 752462 (1904-02-01), Morey
patent: 2566622 (1951-09-01), Millier
patent: 3190408 (1965-06-01), Petterson
Baril Jacques
Chailleux Georges
Cegedur Societe de Transformation de l'Aluminium Pechiney
Dennison Caroline
Murtagh John E.
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