EP0031979A2 - Method of making mitre joints of wood or similar material,and obtained joints - Google Patents

Abstract

According to the method, after producing oblique lateral planes (1 and 2) on the two ends of a profiled section of undefined length, previously subjected to surface finishing operations, cutting is effected, followed by morticing so as to obtain projections (3, 3') separated by grooves (4, 4'), the projections of one section (A) being adapted to penetrate into the grooves of the opposite section (B) and vice versa. This produces a very strong joint, the work being economical and able to be carried out entirely automatically. <IMAGE>

Description

The subject of the present invention is a method by which an interlocking anquleux assembly can be obtained between pieces of wood or other similar material, in particular for the production of doors or windows, and it also relates to the assemblies obtained by implementing said method.

Various interlocking assembly methods have already been proposed, more particularly applicable to frames or frames for doors and windows made of wood or other material. This type of assembly is always carried out on the raw material, that is to say prior to surface finishing operations such as varnishing, buffing, polishing or other operations which can only take place in workshops. suitably equipped.

On the other hand, the process according to the invention makes it possible to obtain an interlocking assembly from profiled pieces (of wood for example) of indefinite length, previously subjected to the usual operations of varnishing, buffing or other surface finish, and this by means of the use of an automatic multi-tool machine of simple design, capable of being easily installed on the site even where the chassis or frames must be mounted, which ensures a significant saving in the prices of transport and storage of the sets .

The method provides that on a wooden profile or other material of indefinite length, previously subjected to a finishing process such as varnishing, buffing or the like, cutting and then milling operations are carried out at 45 °, applied on both sides and at a determined depth, using rotary milling cutters, these operations being followed by subsequent milling in a direction transverse to the axis of the profile, by means of a rotary milling cutter with an external profile 45 °.

Thanks to a subsequent operation carried out by means of a multiple chisel mortiser, the grooves necessary for joining the two sections of profile are obtained, thereby creating the free spaces intended to receive the projecting parts of the opposite section.

The two sections of profile are then ready for the mutual engagement provided for in the assembly at 45 °, engagement which by means of the prior gluing of the surfaces in contact makes the assembly final, without it being necessary to have recourse to other specific finishing operations.

• Fig. 1 est une vue en perspective montrant les deux tronçons à réunir une fois qu'ont été effectués les travaux mécaniques propres à permettre leur assemblage.
• Fig. 2 est une vue de côté de l'un de ces tronçons.
• Fig. 3 est la vue en bout correspondante.
• Fig. 4 en est une vue en plan par dessous.
• Fig. 5 est la vue en plan par dessous du tronçon opposé.
• Fig. 6 représente à plus petite échelle les deux tronçons à l'état assemblé.
• Fig. 7 illustre de manière schématique la seconde phase de travail du procédé suivant l'invention.
• Fig. 8 à 10 illustrent de même façon les troisième, quatrième et cinquième phases de ce procédé.

The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing.

• Fig. 1 is a perspective view showing the two sections to be joined once the mechanical work proper to allow their assembly has been carried out.
• Fig. 2 is a side view of one of these sections.
• Fig. 3 is the corresponding end view.
• Fig. 4 is a plan view from below.
• Fig. 5 is the plan view from below of the opposite section.
• Fig. 6 shows on a smaller scale the two sections in the assembled state.
• Fig. 7 schematically illustrates the second working phase of the method according to the invention.
• Fig. 8 to 10 likewise illustrate the third, fourth and fifth phases of this process.

As can be seen in fig. 1 the end or "head" of the section A of batten comprises, at the end of the work, the shape shown, comprising more precisely two lateral planes 1 and 2 oriented obliquely at 45 °, a series of projections or tenons 3 with an angled profile which extend in front of the aforementioned planes 1 and 2, and a series of grooves or mortises 4 formed between said projections 3 and established in number and in dimensions corresponding to these, these grooves 4 being offset so as to cooperate with the projections provided on the opposite section B, the identical parts of which have been designated by the same references assigned d 'a clue.

During assembly, the projections 3 of the section A penetrate into the grooves 4 'of the section B at the same time as the grooves 4 of A receive the projections 3' of B. In this way, a "comb" interlocking is produced which gives a maximum resistance to the angular assembly of the two batten sections.

Note in fig. 2 and 3 that the projections 3 resulting from the 45 ° cut of each section of the batten constitute a single piece with the entire section itself.

Fig. 4 and 5 show how the projections 3 which emerge from the section A of the batten correspond to the grooves 4 'formed on the opposite section B, while the projections 3' integral with the section B are received in the grooves 4 formed in the section A.

Reciprocal nesting is obtained with great ease, as illustrated in fig. 6 which shows in broken lines the projections 3 'which after gluing penetrate into the end or "head" of the section B, thereby achieving a perfectly solid right angle assembly and easy to perform.

The working process for preparing the anquleux assembly according to the invention was illustrated in fiq. 7 to 10.

After cutting the batten to measure, obtained using a simple circular saw or the band type (not shown), the second work phase, shown in fig. 7 and 8; this second phase is carried out on both sides of the batten by means of rotary circular milling cutters 5 and 6 of cylindrical shape, capable of ensuring the formation of the faces at 45 ° under different depths on the two sides of the batten.

The third working phase is carried out using the rotary cutter 7 of FIG. 9, which partly has a cylindrical profile and partly a frustoconical profile, the slope of the latter being 45 ° relative to the axis, so as to obtain an inclined plane 8 on the batten and to form the projections 3.

During the fourth phase of work, the grooves 4 are obtained on each of the heads of the batten, using multiple tools 10 in the form of chisels which operate a slotting.

In a particularly advantageous manner, all of the abovementioned operations are obtained by means of a multi-tool machine of new design which is not described here, said machine allowing a fully automatic work and thereby reducing the hand of artwork.

The two sections have at the end of the process a perfect surface finish and they are ready to be assembled by means encollaq ₀ prior contact surfaces.

It should moreover be understood that the above description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the execution details described by all other equivalents.

Claims (2)

1. Method for producing an angular interlocking assembly of pieces of wood or similar material, characterized in that it consists in producing, on a piece of indefinite length which has in section the final profile of the two sections to be assembled and which was finished superficially, the cut to the measurement of the two sections followed by a first surface milling at 45 ° on the two opposite ends obtained and a second milling oriented perpendicular to the axis of the part and carried out using of a rotary taper with a frustoconical profile with 45 ° laying, then subjecting each of the ends of the part to a subsequent mortising operation using multiple tools in the form of chisels in order to dig a series of grooves or mortises separated the from each other by comb projections or tenons which extend over approximately half the height of the workpiece and which are arranged, in front of the 45 ° planes obtained during the first working phase, at positions corresponding to the grooves made in the opposite end, thereby making it possible to obtain two finished sections ready to be assembled by interlocking by means of prior gluing of the surfaces in contact. 2. Angular interlocking assembly produced by implementing the method according to claim 1, characterized in that the end of each of the two sections to be assembled has projections or tenons (3 and 3 ') in the form of a comb which s' extend in front of side planes milled at 45 ° made on the part over about half of its height, and which are separated from each other by grooves or mortises (4 and 4 ') inside which penetrate the aforementioned protrusions of the opposite section, so as to obtain an extremely resistant assembly by means of rapid and economical work carried out on a part of indefinite length having its surface finish.

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