DOUBLE-TAU-PROFILE

Abstract: The subject of the present patent is a new kind of cold-formed profile with significantly higher strength, bending resistance and stability in comparison with the profiles used till today. Some other advantages with regard to production consist in using less powerful machines or forming-machines, less thick sheet materials and less steel in the making of the necessary forming rolls for dressing the bending stages of the profile. The profile consists of an only sheet strap forming web (1) and flanges (2, 3) and originating a form like a double Greek T (tau) with two bigger symmetrical parts (2) of double thickness in comparison with the central part and two very flat symmetrical parts (3) of triple thickness if compared with the central part as depicted on the drawing.

Description: Double-TAU-Profile Thecnical Field and Background Art The subject of the present patent is a new kind of cold-formed profile 5 with significantly higher strenght, bending resistance and stability in comparison with the profiles used till today. Some other advantages with regard to production consist in using less powerful machines or forming-machines, less thick sheet materials and less steel in the making of the necessary forming rolls for dressing the I Q bending stages of the profile. In any case the main purpose of this patent is to obtain a profile that at parity of resistance for instance with an omega-profile, allows a substantial saving of material and at the same lime the elimination or a considerable attenuation of the instability problems like the tendency of 5 under load omega-profiles to open their flanges. A second purpose is to fill a technological gap of I-beams that never fall under a certain thickness and to assure a solution for the instability problems of thin thickness sheet irons. 0 Disclosure of the Invention The profile consists of an only sheet strap forming web and flanges and originating a form like a double Greek T (tau) with two bigger simmetrical parts of double thickness in comparison with the central part and two very flat simmetrical parts of triple thickness if compared with 5 the central part. Figure number 1 depicts the pattern of the sheet middle line. More precisely and starting from point "D", that is situated on the right high side, the profile consists of following features: " 1 ) -a level part that is intermediary between two other level parts and that begins with a down word folded part, wedged in the rounded zone (see point "D") and that ends in point "B"; 2) -a part "B" of the step that runs substantially in parallel with the central core ( see point "C"); 5 3) -a part that begins from the step in point "B" and that goes upward again and reaches the highest zone of the flange through a curved bracing part ( see point "E"); 4) -a level part that starts from point "E" and reaches the central point 5) -a curved bracing part ( see point "A"); 6) -a level part that starts from point "A" and comes back again to point "D"; 7) -a curved rounded bracing point ( see point "D") that stretches itself downward and joins the lowest part of the flange right side ( see point "C"Y 8) -a level part that starts from point "D" and comes back to the central step ( see point "B"), where it joins again the central core (see point "C"); 9) -a level perpendiculary part forming the central web and from which the other half of the profile starts: this half results symmetrical and specular to all the above mentioned parts. The high and the low part are endowed in their central zone ( see points "A") with a bracing that stretches itself to the interior of the profile. The bracing magnitude prevents the presence of instability phenomenons due to compression stresses and it enables calculuses by utilizing the whole flange breadth. Both left ends of the flanges originate two triangular zones through a sort of zigzag. These zones solve at the same time two kinds of problems: 1) -the step (see points "B") that forms prevents the reopening of the profile height with regard to both bases ( see point "C"); 2) -with both triangles on the subject corresponds a notable strenght to torsion; so the above mentioned triangles prevent buckling and/or screwing phenomena of the profile along its longitudinal dimention. The action of rivets and/or bolts on the two left parts of the flanges (formed by a triple sheet thickness) that are used as joint means with profiles and/or underlying or overhanging parts, makes the profile more compact and contributes to transmit the stresses more uniformly. R-ivets and/or bolts can be applied to both triangular halves of the flanges by locking them to the most external thickness or to both thicknesses through opportune technical expedients. The profile is cold formed and during all formation process the central web is kept horizontal; both triangular halves of the flanges get out from the forming machine in overhanging position with regard to the other two halves. In comparison with an omega-profile we have a saving of special steel used for the realisation of the forming rolls, as the size of the mentioned rolls is determinated in the double-tau-profile by the half of the flanges, SO while in the omega-profile its size is determinated by the height.The above mentioned height results to be at least twice as much the other peculiar dimension; this involves, by using an omega-profile, a quadruple employment of material. The double-tau-profile needs more passages for its realisation, but the 85 same rolls can be used for double-tau-profiles of different height ( and this use is not possible for omega-profiles ). It is also important to underline that the sheets used for the doble-tau- profile are of half thickness in comparison with the sheets used for the omega-profile at parity of strenght; this involves the use of smaller and 90 less expensive forming machines. In the black sheet version the profile can be hot plated with zinc. The hot zinc-plating can originate, besides a greater strenght, also a small deposit in the parts of the steps ( see points "B") and of the central core ( see point "A" ) and give rise to a physical unity between both parts; this can 95 contribute to a more uniform transmission of the .stresses. Best Mode for carrying out the Invention On the picture FIG 14, for instance, are represented some intermediate stages for producing the profile on the subject. In particuliar it is not 100 necessary, in the stages from "G" to "H" and in those from'T' to "L" to come with the rolls over the folding, also because of the particular kind of folding. In the first case the sheet overlapping can be obtained by means of rolls pressing on the upper side and originating a round folding according to the plan.In the second case the termination of the folding 105 can be obtained without coming with the rolls inside the same folding. It can be sufficient to work with the rolls containing the profile as far as the step formed by the triangular zone, and this wheter by utilising the innermost side that presses on the round folding or closing more the same folding, working with the lower rolls envelopping it. HO Besides, in the stages "C" and "D" are realised foldings that in a following stage could cause some problems. It is important to underline that for forming the foldings on the subject is also pulled down the concerned zone for a few degrees. The central core can always remain horizontal in profiles with upper and 115 lower always parallel flanges, but not more peφendicular with the core (see for example pictures FIG 5, 6 and 7) and in the last stages you can use rolls with vertical axis. An alternative can be obtained by inclining the central core with regard to the horizontal level; so the flanges are brought to a similar vertical 120 position.

Claims: C L A I M S This patent includes also following variants of the above mentioned profile: 1 )- the profile without sufferings in the lower part, that is a more stressed zone by traction ( see picture FIG 8 ); 2)- the profile in the different kinds of steel and dimentions; 3)- the profile in the different kinds of aluminium and dimentions; 4)- the profile in the different kinds of lacqued sheet; 5)- the profile in the different kinds of black sheet; 6)- the profile in the different kinds of pickled sheet; 7)- the profile in the different kinds of zinc-plated sheet; 8)- profile in the different sheet thicknesses; 9)- the profile protected from corrosion through hot zinc-plating; 10)- the profile protected from corrosion through the different kinds of galvanic processes; 11)- the profile provided in the stiffening zones "A" with the step "B" and with the bordering zones of embossments, deformations and corrugations that contrast each other for better transmitting the stresses; 12)- the profile provided with holes or buttonholes in the different parts of the web and of the flanges; 13)- the profile with stiffenings in the "A" zones, that lean outside and not inside; 14)- the profile continually or not continually welded in the "B" zones of the steps by automatical processes at the forming machine and not in order to better join the flanges with the central web ( see part "C" of FIG i); 15)- the profile endowed in the stiffening zones "A","B","D" and "E" with more or less level, more or less folded, more or less rounded and/or more or less curved stiffenings; 16)- the profile with steps ( see points "B") that extend more or less parallel and more or less adherent to the central web ( see point "C"); 17)- the profile with the three thicknesses forming the right zones of the flanges and that run more or less parallel and more or less detached and/or adherent one another; 18)- the profile with the triangular zones forming more or less wide left parts of the flanges ( see for instance pictures FIG 2, 3, 4 ); 19)- the profile with embossments as reinforcing channels on the central web in order to give more strenght and/or rigidity. The above mentionned channels can be placed more or less diagonal, more or less vertical, more or less spaced and can be formed by plastic deformation; 20)- the profile in which the upper and/or the lower flanges are more or less inclined inside, in order to have more external points of the "A" zones with regard to the points of the "D" and "E" zones for facilitating the contact with overhanging and/or underlying profiles; 21)- the profile with more or less localised and more or less distributed embossments for better adhering to cement; 22)- the profile with rectangular ( and not triangular ) left zones of the flanges, for instance for ceiling applications ( see for example pictures FIG 11 and 12 ); 23)- the profile with triangular left zones in the upper and lower flanges, joined at more or less great intervals by rivets, screws and bolts running along the profile height; 24)- the profile with triangular left zones of the flanges that are similar to the right zones of the flanges with an only step in evidence formed by SO deformed V-shaped sheet. The step can be more or less open and lean with its top inside the profile; 25)- the profile with always parallel upper and lower flanges, but no more peφendicular to the central web ( see for example pictures FIG 5, 6 85 and 7 ), for instance for inclined iron roofings. 26)- the profile with always parallel upper and lower flanges, but no more peφendicular to the central web for applications with opposite inclinations ( see pictures FIG 9 and 10 ). 90 27)- the profile with the two triangular zones in the upper and lower flanges, not more both in the left (or in the right) side, but one in the left and the other in the right side (see for example picture FIG 13); 95 28)- the profile protected in the welding zones (the welding can be obtained throught various methods, for instance by not continually welding), in order to make the profile more compact and effectual for its use by means of direct zinc application, throught systems in sequence at the forming machine and not and throught phisical-chemical processes at 100 a low temperature; 29)- the profile bounded with adhesive continually or not continually in the "B" zones of the steps by automatic processes in sequence at the forming machine and not, for better joining flanges and central web (see 105 point "C" of picture FIG 1 ).

Inventors: TOSONI MARIO, TOSONI, MARIO
Applicants: TOSONI MARIO, TOSONI, MARIO
Application year: 1997
Main classification: E04C3
IPC codes: E04B7, E04B9, E04C3