Technical Field The invention pertains to a multiple structure profile for door and window frames that uses a structure provided with outward facing couplings having the same characteristics, as far as the window sash or door as well as the frame are concerned. The structure is also provided with an outer metal section bar having inward facing couplings, which feature the same characteristics, as far as the window sash or door as well as the frame are concerned.

Bac/çround Art Multiple structure profiles for door and window frames were invented many decades ago. Each of them is formed by a set of section bars made either of the same material, or of a different one. One of the section bars can be fixed on a wooden fillet by means of fixing resin or plastic section bars.

Usually, a metal section bar makes up the outer part of the frame, whereas the wood makes up the inner one. The section bars interposed between the outer metal section bar and the wooden fillet are made of aluminium or plastic. They thermally insulate the inside from the outside by forming one or more thermal break chambers.

The outer metal section bars of the frame are generally different, depending on if they are destined to make up the jamb rather than the window sash or door. Said difference concerns the aspect (and pertains to the outward facing wall of the section bar), but most of all functionality. As a matter of fact, the couplings allowing for them to connect to the structure differ according to whether it is a jamb, a window sash, or a door. The presence of distinct couplings requires the purchase of many aluminium or plastic section bars interposed between the outer section bar and the structure fixed to the wall.

Clearly, this operation affects production costs as far as the supply of the

different kinds of section bars is concerned, but it also affects assembly costs, and warehouse management.

Summary of invention The aim of this invention is the manufacturing of a multiple element profile having such structural elements that it does not fall into the above mentioned problems.

Another aim is to give users a particularly adaptable multiple structure profile as far as the aspect of its outer side is concerned.

According to the claims, this and other aims are reached by the multiple structure profile for door and window frames having a structure provided with outward facing couplings, which have the same characteristics whether the structure is used in the jamb, window sash, or door. Not depending on the shape of its outward-facing wall said structure fastens to an outer metal section bar provided with couplings for its fastening to the structure itself.

Said couplings having the same characteristics, not depending on the fact whether the section bar is used in the jamb, window sash, or door.

The structure is made up by a first section bar disposed for fastening to the outer metal section bar, by a second section bar, and by one or more wooden fillets fixed on the second section bar by means of fixing resin or plastic section bars. The first and the second section bar are made of aluminium or plastic.

Not depending on the shape of its outward facing wall, the outer metal section bar has three permanent size factors: the height between its basis and its lower coupling, the interdistance between the two couplings, and the height between its upper coupling and its top. Its basis can make up the rabbet joint on the outer casing, if the outer metal section bar makes up the frame jamb, or else the rabbet joint of the gasket, if it makes up the window or door. Its top may hold back the rabbet gasket, if the outer metal section bar makes up the frame jamb, or else it may hold back the glass blocking gasket, if it makes up the window sash or door.

Production costs are lowered by the fact that the structure is provided with outward facing couplings having the same characteristics, whether the structure is used in the jamb, window sash, or door. And likewise, by the fact that the outer metal section bar is provided with couplings facing the structure and having the same characteristics, whether it is used in the jamb, window sash, or door. Moreover, it is possible to use the same outer metal section bar in the jamb, window sash, or door. Said outer metal section bar can have a differently shaped outer wall, and thus be able to make up aesthetically different window and door frames, when looked at from the outside.

Brief description of the drawings Further characteristics and improvements of the invention shall be enhanced by the description of a preferred but not exclusive way of implementing said multiple structure profile for door and window frames, which is indicatively but not limitatively illustrated in the enclosed drawings, where: - figure 1 shows a cross-section of an outer metal section bar according to the invention ; figure 2 shows a cross-section of the structure's first section bar according to the invention ; - figure 3 shows a cross-section of the structure's second section bar; - figures 4,5, 6, and 7 show the cross-section of four different multiple structure profiles according to the invention.

Best Mode for Carrying Out the Invention The multiple structure profile used for manufacturing window and door frames is obtained by connecting an outer metal section bar 1 and a structure.

The structure is made up by a first section bar 2, a second section bar 3, a fixing resin layer 4, and a wooden fillet 5,6. The first section bar 2 is made of plastic, whereas the second section bar 3 is made of metal.

The outer metal section bar 1 is provided with two fins 1.1, 1.2 facing the

structure and delimiting a guide slot 1.3.

The bottom part of the metal section bar 1 has a box-type structure and is made up by two fins 1. 4,1. 5, which face the structure and are joint by a third fin 1.6. The fins 1.4, 1.5, 1.6 and the outer wall 1.7 of the metal section bar 1 delimit a chamber 1.8. Each of the two aforementioned fins 1.4, 1.5 facing the structure is provided with a wing 1.41, 1.51 having a recess next to it.

The plastic section bar 2 is provided with two first fins 2.1, 2.2, which face the outer part of the frame and embrace the metal section bar 1. The distal end of each fin 2.1, 2.2 that faces the outer part of the frame consists of a support pin provided with a jut facing the metal section bar 1.

Once the two section bars 1,2 are drawn near, each of the aforementioned fins 2. 1, 2. 2 finds itself between the wings 1. 41, 1. 51 and the two fins 1. 4, 1.5 provided with the recesses. The wings 1.41, 1. 51 of the metal section bar 1 are caulked once the fins 2.1, 2. 2 of the plastic section bar 2 are in position. When the wings 1.41, 1.51 of the metal section bar 1 are caulked chamfered, they constrict the support pins of the fins 2. 1 2. 2 of the plastic section bar 2, thus pushing their juts into the recesses. The cog provided at the narrow end of each jut fixes with the edge of the corresponding recess.

This kind of joint avoids that section bars 1,2 disengage from each other, but it allows for the plastic section bar 2 to slide with respect to the metal section bar 1.

On its inward facing wall, the plastic section bar 2 features two fins 2.3, 2.4, which are identical to the aforementioned fins 2.1, 2.2. They embrace the metal section bar 3 provided inside the structure.

The metal section bar 3 has a box-type structure, and it is made up by two radial fins 3.1, 3.2 joint together by means of two fins 3.3, 3.4. The first fin 3.3 faces outwards with respect to the frame, whereas the second fin 3.4 faces inward. The two radial fins 3.1, 3.2 are provided with two wings 3.11, 3.21 both featuring a recess next to them. Once the two section bars 2,3 are drawn near, each of the aforementioned fins 2.3, 2.4 of the plastic

section bar 2 finds itself between the wings 3. 11, 3.21 and the two radial fins 3.1, 3.2 of the metal section bar 3 provided inside the structure. The wings 3. 11, 3.21 are caulked when the wings 2.3, 2.4 of the plastic section bar 2 are in position. When the wings 3.11, 3.21 of the metal section bar 3 are caulked, they constrict the support pins of the fins 2.3, 2.4 of the plastic section bar 2, thus pushing their juts into the recesses provided on the fins 3.1, 3.2. Hence, the cog provided at the narrow end of each jut joints against the edge of the corresponding recess. In this case, too, it is avoided that section bars 2,3 disengage from each other, but the plastic section bar 2 can slide correctly with respect to the inner metal section bar 3.

The inner metal section bar 3 features two further arms 3. 41, 3. 42, that originate from the inward facing fin 3. 4. Said arms 3. 41, 3. 42 are hook-bent in order to form grooves that face each other and are placed between them and the fin 3. 4.

Dovetail slots are shaped on the wooden fillet 5,6 wall facing the outer part of the frame.

The resin 4 is injected into the blind-ended groove between the metal section bar 3 inside the structure and the wooden fillet 5,6. Said resin also fills the above mentioned dovetail slots performed on the wooden fillet 5,6, and the grooves delimited by the arms 3.41, 3. 42. Once solid, the resin 4 permanently fixes itself to the wooden fillet 5,6.

The outer metal section bar 1 always features the same interdistance between the wings 1.41, 1.51. Since the arms 2.1, 2. 2 of the plastic section bar 2 have such an interdistance as to be locked by the wings 1.41, 1.51 of the outer metal section bar 1, reasonably said metal section bar 1 can be fastened to the structure, not depending on whether it makes up the jamb, window sash or door.

On the contrary, according to the invention, two metal section bars 1-even featuring a differently shaped outer wall-can make up the outer part of the jamb, window sash, or door by using the same structure. The

interchangeability between outer metal section bars 1-even if the outer wall is shaped differently-and the structure of the frame is supported by the fact that, beyond the interdistance between the wings 1.41, 1.51, each metal section bar 1 has two further fixed size factors. And namely, the height between its basis and the lower wing 1.51, and the height between the lower wing 1.41 and its top. Hence, the basis of the metal section bar 1 can make up the rabbet joint on the outer casing, if the outer metal section bar 1 makes up the frame jamb, or else make up the rabbet joint of the gasket, if it makes up the window sash or door. Its top may hold the rabbet gasket back in the guide slot 1.3, if the outer metal section bar 1 makes up the frame jamb, or else it may hold back the glass blocking gasket, if it makes up the window sash or door.

Production costs are lowered by the fact that the structure is provided with couplings, which face outwards and feature the same characteristics, whether it is used in the jamb, window sash, or door. And by the fact that likewise the outer metal section bar is provided with couplings, which face the structure and feature the same characteristics, whether it is used in the jamb, window sash, or door. It is namely specifically possible to use one single structure and a few outer metal section bars, in order to make up many window and door frames that are aesthetically different when looked at from the outside. For example, with just three outer metal section bars and one single structure, it is indeed possible to make up nine different combinations of window and door frames.