PRODUCTION METHOD FOR WINDOW AND DOOR FRAMES WOOD-METAL PROFILES, AND RELATIVE PROFILES OBTAINED WITH SUCH A METHOD

Abstract: A method for producing wood-metal profiles or section bars for window and door frames by continuous injecting a binding material (B) into a space between said profiles or section bars (A, C), said method comprising: - using a wood spline (A) with at least one longitudinal slanting groove-milling (3) made on the surface intended for receiving the joint binding material (B); - using a metal profile (C) provided with longitudinal undercut slanting or thickened end tongues on the space intended for receiving said binding material (B); - continuous injecting a binding material (B) into said space; and wherein the contact surface between the binder (B) and the metal profile (C) is not glued for allowing longitudi­ nal sliding and avoiding distorsions; joint between profiles or section bars for forming window and door frames is also carried out by means of grooves for injecting binding mate­ rial.

Description: Production method for willdow alld door frames wood-metal profiles, and relative profiles obtained with such a method The presellt inventioll relates to a method for producing wood-metal profiles or section bars for window and door frames and profiles or section bars obtained with such a method. The invention is particularly suitable for use ill producing wiiidow alld door frames ill which a strong, indeformable, durable metal outside structure aiid a room-warmed, iilsulatiilg wood iiiside structure is desired. At the preseilt state of the art, a number of wood-metal profiles or sectioii bars for window aiid door frames are knows, in which joint between wood and metal is carried out in various ways; examples of pertineiit background art documellts are: : - DE - U - 1 885 669 (Schanz Metalbau) wherein said joint is provided by meaiis of synthetic material small blocks (8) which are inserted by pillS (9) iiito the wood profile (3) aiid wherein each small block (8) fits, sliding longitudinal ill free clearance and rabbet adhesioll of the surface of one tongue of the metal profile agaiilst the wood spliiie, ill the aluminium coverillg profile (4), the bearing structure of the frame beiiig therefore in this case the wood frame and not the aluminium profile which is only a coverillg, thus without structural beariiig characteristics; - DE - U - 7 128 609 (E. Notter) whereiii said joint is provided by iiiterposiiig a plastic biiiding-adhesive material (27/29) which glues the wood spliiie (14/16) to an aluminium alloy profile (10/12) by means of tongues, some of which fuiiction as rabbet spacers with wood adhering surfaces (42,46), ill this case both wood and metal materials are joined for constituting a siiigle inseparable bearing structure in all directiolls; - FR Al - 2 371 - 568 (P. Chou) wherein said joiiit is provided with adhesion surface rabbets, between all inside bearing metal profile structure (1) arid wood covering spliiies (11) by pre pressing car said wood splines (11) elastic plastic material tongues (12) which fit by pressure ill the bearing metal profiles or sectioji bars having core structural fullction (1), while the wood splices have ollly a coverillg function, not a structural bearing fuiiction; - DE - Al - 2 736 151 (E. Hueck) wherein said joirit between different profiles or section bars is provided by means of taidercut tongues with an additional spacing profile (12), with a plastic binding-adhesive material (7,8) for carryillg out a sillgle bearing structure in all directiojis; ; - AT - B - 345 529 (R. Falkller) wherein said joint between different profiles or section bars (2,3) is provided by means of talgues with thickened inserting ends (6), without contact surfaces but with a preformed fitting material (5) for carrying out a single beariiig structure in all directions; - Europeaii Patent Application EP -Al - 0 053 104 (Matauschek), Int. Class. E OS B 3/26 published Oil 02.06.82 ill Europeaii Bulletin 82/22 describes a joillt system between alumillium alloy profile (2/9) by meaus of longitudillal toothed edged tongues (4) and grooved (6/10) or dovetail (7,8) wood, by means of plastic bindiIig-adhesive material (11) extruded by colltilluous extrudillg process machiiie (5/11). The drawbacks of the currently used solutioiis and of the above mentioned prior art consist essentially in that: - Ia. either one of the two profiles or sectioii bars is idiot structurally beariiig but has olily a covering function (DE - U - 1 885 669 (Schaiiz Metalbau); FR - Al - 2 371 568 (P. Chou)); - IIa. or they are ill a single bearillg structure integral for bearing stresses in all directions (DE - U - 7 128 609 (E. Notter); DE - Al - 2 736 151 (E. Hueck); AT - B - 345 529 (R. Falkner); EP - Al - 0 053 104 (Matauschek)). The invention as claimed is intended to provide a complex illtegral continuous beariiig wood-metal profile as in solution IIa., structurally much more strong than profile of solution Ia. Allyhow, the disvantages of the illtegral profiles or section bars of the above-mentioned solution IIa. consist mainly in that, being the two materials with different coefficient of expansion, sudden changes of temperature cause same to deform and warp so that window aiid door frames thus obtained either have sealillg defects or might not close for interference. Furthermore, the above-mentioned prior art metal profiles or section bars: - Ib. either are provided with wide cotitact surfaces of the wood spline (DE - U - 1 885 669 (Schaiiz Metalbau); DE - U - 7 128 609 (E. Notter); FR - Al - 2 371 568 (P. Chou)); - IIb. or are provided with minimum contact surfaces but with additional spacers (DE - Al - 2 736 151 (E. Hueck); - IIIb. or are not iii contact (AT - B - 345 529 (R. Falkner); EP Al - 0 053 104 (Matauschek)), iii such case thermal passage is avoided improvillg iiisulatiiig effectiveness, but keeping a coiistaiit spacing at acceptable tolerance between the two profiles or section bars is difficult, as it is well known to those skilled ill the art that in the case of continuous extrusioll of binding material (for example when using foamed polyurethane ) said material is subjected to shrisslkages alid variations which finally change thicklless. Further disadvaiitages result from the difficulty of edge joilling iii ratiollal manner the 450 cut profiles or section bars for mailufacturing the respective frames, therefore said methods still use collvelltiollal joint squares. Further drawbacks cotisist in the difficulty of carrying out a set of few profiles or section bars suitable for permitting realizatioii of both single and double window and door frames as well as frames provided with window shades. A first object of the present invejitioii is to avoid profile distortioiis assuring at the same time a structural integral bearillg resistance of the window aiid door frame with respect to both materials which collstitute said profile, i.e. both wood and metal. A second object of the invention is to obtain a constaiit section profile without spacing chaiiges between the two integral wood metal splines, reducing thermal passage to a minimum alid without necessity of intermediate spacers. A third object of the present invention is to permit 450 cut courtier head joint ill more effective structural ma uler. A fourth object of the invention is to carry out a set of staiidard profiles or section bars which allow manufacture of both sillgle aiid double frames as well as frames capable of receiving curtain in the middle thereof. The whole with the maximum effectiveness of structural strength, solidity of 45 joillts illcluded, aid maximum insulation effectiveness. The illvelltioll as claimed is intended to remedy the above-mentioned disadvalltages. It solves the problem producing wood-metal profiles or section bars according to the characteristics as claimed in the appeiided claims. The advantages offered by this invelltioll are maillly that the profiles or sectioii bars will no longer uiidergo distorsioiis due to sudden chaiiges of temperature, they will be of coiistant section, of highest structural strength aid with thermal passage reduced to a millimum, therefore with high degree of insulatioll; the 450 joiiits will be strotig and easy to made aiid the staiidard shaped profiles or sectioti bars will allow carrying out of both siiigle alid double frames with possibility of iiiserting also window shades ill the middle thereof. One way of carrying out the invention is described in detail below with reference to drawings which illustrate some preferred embodimellts, in which: Figure 1 is a schematic view with elllarged effect of the distorsioll (warpillg) undergone by the currently-used wood-metal profiles or section bars rigidly welded between them by a binding-glueing agellt, because of suddeii changes of temperature; Figure 2 is the same view of the distorsion effect due to sudden change of temperature ill the wood-metal profile joined with biiiding iiot glueing material accorditig to the presetit invention; ; Figures 3, 4, 5, atid 6 are sectiotial views of a set of standard profiles or section bars for carrying out window alld door frames according to the present illvelltioll; Figure 7 shows all example of window single frame; Figures 8 alld 9 are the transversal sectiotial views with respect to plates A-A and B-B respectively, of Figure 7; Figure 10 is a perspective view of the 450 cut head of a profile with prearratiged groove for 900 head joint with other elements for forming window aiid door frames; Figure 11 is a front view of a joint corner of two profiles or sectioti bars as per Figure 10 with section oil plane D-D of Figure 13; Figure 12 is a view taken oil the opposite side with section oil plane C-C; Figure 13 is a view taken oil the outer side with partial section X-X and Y-Y respectively of the two preceding figures; Figure 14 is a sectiotial partial view oil the vertical plane A-A and B-B of a double window frame with possibility of ijiserting in the middle thereof also a window shade. According to the above figures the invention provides complex profiles or section bars coiisistiiig of a wood spline (A) joined by meals of a binding material (B) to all aluminium alloy profile (C), wherein said alumillium profile is provided with bent tollgues with thickened ends for forming inidercuts (2), otie of said tongues being arrow-head-shaped? for makillg rabbet of constant spacillg but with millusum contact surface in order to reduce thermal passage (2'), and wherein the joini!lg surface of the wood spline (A) has loiigitudiiial slantillg opposed dovetail llotches-millillgs (3). Accordiiig to the invention, joint is made ill cotitinuous: - pretreating the colltact surface (1) of the metal profile (C) with a release agent, for example by coating with buffer or by spraying grease or silicone or other lubricating or allti-glueillg materials or using metal profiles or section bars surface treated agaiiist glueijig of billdillg material; ; - iiljecting insulatilig bindiiig material such as foamed polyurethalle (B) into the space between the two joined profiles or sec ti oil bars kept ill contact by meails of pressure rollers atid guides durillg continuous advancing of filiform battering (2'). The result is that ill the differences of thermal expansioll betweeii the wood (A) atid metal (C) materials, the latter will slide oil the not-glued surface (1) of the binder (B) without therefore warping the profile that otherwise would lose linearity. The profiles or sectioii bars have the shapes as shown in the figures and permit to carry out the illustrated window and door frames. For 450 head joillt, a deep 450 "V" notch (4) is made ill the wood, said notch extending still 450 "V" shaped but less deep also iiito the binding material (B) aiid into the metal profile (C), so that by a head joint a kind of hole (4') is obtained leadilig to all iller larger pocket in the wood (4) atid wherein whell heads mate, all injection of quick setting bindiiig material such as bindiiig polyurethane resin (B') is effected. Of course, changes atid modificatiolls call be made without departing from the spirit or scope of the iiivention as defined ill the appeilded claims.

Claims: Claims: 1. Method for producing wood-metal profiles or section bars for window ailed door frames by meals of continuous injecting a binding material (B) into a space between said profiles or sectioti bars, characterised in that it comprises: : - usirig a wood splice (A) with at least one lotigitudinal slatiting notch-milling (3) made on the surface intended for receiving the joint biiidiiig material (B); - using a metal profile (C) provided with lotigitudinal uiidercut slanting or thickened end toilgues Oil the space intended for receivitlg said binding material (B); - cotitinuous injecting a binding material (B) in said space; and characterised in that said metal profile (C) is provided with a surface (I) on said binding space with said binding material (B) and/or said binding material (B) is of such a composition as to adhere by glueiiig oil the colltact surface of the wood spline (A) but not to adhere oil said contact surface (1) of the metal profile (C) aid this iii such a way so that loiigitudinal slidiiig between the two respective surfaces results sufficiently free eveii though in narrow ailed forced maluler but such that, when elongation differellces occur uiider sudden change of temperature, longitudinal slidiiig of one profile with respect to the other is possible without causing straightless distorsions. 2. A method as claimed ill claim 1, characterised ill that said metal profile (C), before being subjected to binding treatment with binding material (B), is treated oil said joinillg surface (1) with a release agent. 3. A method as claimed ill claims 1 and 2, characterised ill that said release ageiit is a lubricant. 4. A method as claimed in the preceding claims, characterised ill that said release agent is a silicoti product. 5. A method as claimed in the preceding claims, comprisillg continuous iiijectioil of bindiiig material (B) on the profiles or section bars to be joined wheii advaiiciilg oil the horizontal. plate oriented oil the longitudinal opeiliilg from the bottom upward, characterised ill that the respective metal profile is provided, ill the joiiiiiig area with said building material (B), underiieath, with a tongue extending lollgitudillally alld fotr such a depth as to rabbet against the surface of the wood spline to which it has to be joined (A), so that said longitudinal spacing tongue (2') acts as coiitaining bottom realizing a containing groove within which said injection of binding material (B) from above is carried out. 6. A method as claimed ill the preceding claims, characterised in that for head joiliiilg said complex profiles or section bars thus obtailled in order to form frames, after 450 cut, all opposed groove is carried out comprisillg a deeper recess (4) extending with a less deep recess (4') toward the outside surface at one side of the frame for subjectiiig joint to a successive filling iiijectiotl of the recess thus obtained with a binding material (B'). 7. A method as claimed ill the precediilg claims, characterised ill that said iiljectiotl opeiling (4') extends toward the side of the metal profile (C). 8. Wood-metal profile for window and door frames obtailled with the method according to the preceding claims, characterised ill that the respective metal profile is provided, ill the joint area with said billding material (B), with a totigue extelldillg lollgitudillally and for such a depth as to rabbet against the surface of the wood spline to which it has to be joiiled (A) being the respective cotitact eiid shaped like a head-arrow? (2'). 9. Window or door frame cotisistiiig of a plurality of profiles or sectioii bars in accodance with the preceding claims. 10. Set of profiles or section bars having the shape as showil ill the figures of the description drawings and window and door frames obtained with said profiles or sectioll bars.

Inventors: CANDUSSO, BRUNO
Applicants: CANDUSSO F.LLI S.R.L. BILICBORA
Application year: 1984
Main classification: E06B3
IPC codes: E06B3