EP0077284A1 - Method and device for glueing together two wood surfaces - Google Patents

Method and device for glueing together two wood surfaces Download PDF

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Publication number
EP0077284A1
EP0077284A1 EP82440032A EP82440032A EP0077284A1 EP 0077284 A1 EP0077284 A1 EP 0077284A1 EP 82440032 A EP82440032 A EP 82440032A EP 82440032 A EP82440032 A EP 82440032A EP 0077284 A1 EP0077284 A1 EP 0077284A1
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EP
European Patent Office
Prior art keywords
grooves
wood
wheel
displacement
compression
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EP82440032A
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German (de)
French (fr)
Inventor
Raymond Burger
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F1/00—Dovetailed work; Tenons; Making tongues or grooves; Groove- and- tongue jointed work; Finger- joints
    • B27F1/16—Making finger joints, i.e. joints having tapers in the opposite direction to those of dovetail joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing

Definitions

  • the invention relates to a new method of bonding and means for applying it, this method having the result of simplifying the current bonding methods and improving the strength qualities of the joint.
  • the first method described has the drawback, on the one hand, of having to keep the two surfaces under pressure until the adhesive hardens, even if this time can be reduced by physical or chemical means.
  • this collage to be perfect, requires great care in the machining of the woods to be assembled, the bonding surface not being greater than the surface of the joint.
  • the object of the present invention is to remedy the drawbacks of current methods which in particular slow down the development of reconstituted wood by lamination and end-to-end assembly.
  • the main idea of the invention starts from the observation that it is relatively easy to densify the wood by compression in the direction perpendicular to the fibers of the wood, and this particularly when it is coniferous wood, essentially concerned.
  • the second idea is inspired by the self-tightening obtained by the assembly of multiple splices.
  • the inventor endeavored to find means making it possible to make splints, not by machining, but by deformation and densification of the fibers. Because, by making these cuts by densification of the fibers, one practically obtains a doubling of the resistance of the wood at the place of the joint.
  • the preferred means for applying the process described is a simple cylindrical "wheel", the surface of which consists of grooves having the shape of the cuts which it is desired to produce.
  • the wheel rotating freely on an axis, is strongly compressed against the surface of the wood to be entered.
  • the wheel or the wood moves by mechanical action perpendicular to the compressive force exerted between the surface of the wood and the wheel, and perpendicular to the axis thereof, the distance between the axis of the wheel and the surface to enter being constant.
  • the single figure illustrates one of the preferred means recommended for the application of the method, given by way of nonlimiting example.
  • the easy means, object of the invention make it possible to improve not only the assembly techniques, but also the bonding joints.
  • the wheel for example, which is easy to implement and easy to make, will have a much longer service life than the very expensive cutting tools currently used.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

The method for gluing together two wood surfaces each provided with grooves consists in making these grooves on each surface, by displacement and compression, using a cutting wheel, these grooves preferably having a triangular cross-section, and the pitch from one groove to another being equal and of the same value measured at the bottom and at the top, in coating these grooves with glue, and in pressing the two surfaces against one another under great pressure. <IMAGE>

Description

L'invention concerne un procédé nouveau de collage et des moyens pour l'appliquer, ce procédé ayant pour résultat de simplifier les méthodes de collage actuelles et d'améliorer les qualités de résistance du joint.The invention relates to a new method of bonding and means for applying it, this method having the result of simplifying the current bonding methods and improving the strength qualities of the joint.

Pour assembler deux surfaces de bois, on réunit en général celles-ci, préalablement planifiées par usinage et enduites de colle. Ces surfaces sont maintenues sous pression, par des moyens mécaniques, jusqu'à durcissement de la colle.To assemble two wooden surfaces, these are generally joined together, previously planned by machining and coated with glue. These surfaces are kept under pressure, by mechanical means, until the adhesive hardens.

Pour l'assemblage du bois bout à bout, on réalise des entures multiples sur les surfaces à réunir, et on applique une pression axiale sur les deux pièces de bois après avoir enduit de colle ces entures. En exerçant une pression suffisante, on obtient un "auto-serrage" qui permet un durcissement de la colle, sans que l'on soit obligé d'appliquer une pression mécanique sur le joint.To assemble the wood end to end, multiple finger joints are made on the surfaces to be joined, and an axial pressure is applied to the two pieces of wood after having coated these finger joints with glue. By exerting sufficient pressure, a "self-tightening" is obtained which allows the adhesive to harden, without it being necessary to apply mechanical pressure to the joint.

La première méthode décrite présente l'inconvénient, d'une part, de devoir maintenir sous pression les deux surfaces jusqu'à durcissement de la colle, même si ce temps peut être réduit par des moyens physiques ou chimiques. D'autre part, ce collage, pour être parfait, exige le plus grand soin dans l'usinage des bois à assembler, la surface de collage n'étant pas supérieure à la surface du joint.The first method described has the drawback, on the one hand, of having to keep the two surfaces under pressure until the adhesive hardens, even if this time can be reduced by physical or chemical means. On the other hand, this collage, to be perfect, requires great care in the machining of the woods to be assembled, the bonding surface not being greater than the surface of the joint.

La seconde méthode décrite, utilisée pour l'assemblage de bois bout à bout, malgré les progrès apportés ces dernières années à celle-ci, par la réalisation notamment d'entures de plus en plus fines, présente deux inconvénients essentiels :

  • 1°) Ces entures sont très délicates à façonner et exigent des outils coupants ayant une haute tenue de coupe, le désaffûtage entraînant l'arrachement du bois aux extrémités de celles-ci,
  • 2°) La forme même des entures entraîne nécessairement un affaiblissement du joint à cet endroit, préjudiciable lorsque l'on veut transmettre des efforts de traction à travers ce joint.
The second method described, used for joining wood end-to-end, despite the progress made in recent years to it, in particular by making increasingly finer cuts, has two essential drawbacks:
  • 1 °) These splices are very delicate to shape and require cutting tools having a high cutting resistance, de-sharpening causing the wood to be torn off at the ends thereof,
  • 2 °) The very shape of the splices necessarily leads to a weakening of the joint at this location, which is detrimental when it is desired to transmit tensile forces through this joint.

La présente invention a pour but de remédier aux inconvénients des méthodes actuelles qui freinent notamment le développement du bois reconstitué par lamellation et assemblage bout à bout.The object of the present invention is to remedy the drawbacks of current methods which in particular slow down the development of reconstituted wood by lamination and end-to-end assembly.

L'idée première de l'invention part de l'observation qu'il est relativement facile de densifier le bois par compression dans le sens perpendiculaire aux fibres du bois, et ceci particulièrement lorsqu'il s'agit de bois résineux, essentiellement concernés.The main idea of the invention starts from the observation that it is relatively easy to densify the wood by compression in the direction perpendicular to the fibers of the wood, and this particularly when it is coniferous wood, essentially concerned.

La seconde idée s'inspire de l'auto-serrage obtenu par l'assemblage d'entures multiples.The second idea is inspired by the self-tightening obtained by the assembly of multiple splices.

A partir de ces réflexions, l'inventeur s'est efforcé de trouver des moyens permettant de réaliser des entures, non pas par usinage, mais par déformation et densification des fibres. Car, en réalisant ces entures par densification des fibres, on obtient pratiquement un doublement de la résistance du bois à l'endroit du joint.On the basis of these reflections, the inventor endeavored to find means making it possible to make splints, not by machining, but by deformation and densification of the fibers. Because, by making these cuts by densification of the fibers, one practically obtains a doubling of the resistance of the wood at the place of the joint.

D'autre part, l'usage généralisé des entures, aussi bien dans le collage bout à bout que bord à bord, améliore la qualité du joint, la surface de collage étant supérieure à la surface de celui-ci.On the other hand, the generalized use of finger joints, both in butt bonding and edge to edge, improves the quality of the joint, the bonding surface being greater. on the surface of it.

La découverte de ces moyens, autre objet de l'invention, a été facilitée par l'analyse, d'une part, d'un procédé connu de calandrage pour obtenir la densification de feuillets de bois, d'autre part d'un procédé de moletage utilisé en métallurgie.The discovery of these means, another object of the invention, was facilitated by the analysis, on the one hand, of a known calendering process to obtain the densification of wooden sheets, on the other hand of a process knurling used in metallurgy.

Le moyen préférentiel pour l'application du procédé décrit est une simple "molette" cylindrique dont la surface est constituée de gorges ayant la forme des entures que l'on souhaite réaliser. La molette, tournant librement sur un axe, est fortement comprimée contre la surface du bois à enter. La molette ou le bois se déplace par action mécanique perpendiculairement à l'effort de compression exercé entre la surface du bois et la molette, et perpendiculairement à l'axe de celle-ci, la distance entre l'axe de la molette et la surface à enter étant constante.The preferred means for applying the process described is a simple cylindrical "wheel", the surface of which consists of grooves having the shape of the cuts which it is desired to produce. The wheel, rotating freely on an axis, is strongly compressed against the surface of the wood to be entered. The wheel or the wood moves by mechanical action perpendicular to the compressive force exerted between the surface of the wood and the wheel, and perpendicular to the axis thereof, the distance between the axis of the wheel and the surface to enter being constant.

La figure unique illustre l'un des moyens préférentiels préconisé pour l'application du procédé, donné à titre d'exemple non limitatif.The single figure illustrates one of the preferred means recommended for the application of the method, given by way of nonlimiting example.

Une molette cylindrique (1) tourne librement sur un axe (2). Par l'intermédiaire d'un support (3), on applique une pression perpendiculairement à la surface (4) de la pièce de bois (5) à assembler. Des moyens mécaniques non illustrés provoquent le déplacement soit :

  • - du support (3) parallèlement à la surface (4) du bois (5) et perpendiculairement à l'axe (2) de celle-ci,
  • - de la pièce (5) déplacée de préférence à l'aide d'une chaîne de roulement motorisée permettant une forte compression.
A cylindrical wheel (1) turns freely on an axis (2). By means of a support (3), pressure is applied perpendicular to the surface (4) of the piece of wood (5) to be assembled. Mechanical means not shown cause displacement either:
  • - the support (3) parallel to the surface (4) of the wood (5) and perpendicular to the axis (2) thereof,
  • - the part (5) preferably moved using a motorized rolling chain allowing strong compression.

Les moyens aisés, objet de l'invention, permettent d'améliorer non seulement les techniques d'assemblage, mais aussi les joints de collage.The easy means, object of the invention, make it possible to improve not only the assembly techniques, but also the bonding joints.

La molette par exemple, facile à mettre en oeuvre et facile à réaliser, sera d'une durée d'utilisation bien plus élevée que les outils coupants fort coûteux utilisés actuellement.The wheel, for example, which is easy to implement and easy to make, will have a much longer service life than the very expensive cutting tools currently used.

Les entures très fines que cette nouvelle technique permet de réaliser, autoriseront la fabrication de bois lamellé par auto-serrage.The very fine bevels that this new technique allows, will allow the manufacture of laminated wood by self-tightening.

La densification des fibres et l'augmentation des surfaces de collage des joints amélioreront considérablement les qualités mécaniques du bois reconstitué à l'aide de ce procédé.The densification of the fibers and the increase in the bonding surfaces of the joints will considerably improve the mechanical qualities of the wood reconstituted using this process.

Il sera même possible d'enter des surfaces selon un certain angle par rapport à l'axe des fibres, et réaliser ainsi des éléments composés, par exemple des poutres en treillis.It will even be possible to enter surfaces at a certain angle relative to the axis of the fibers, and thus to produce composite elements, for example lattice beams.

Claims (4)

1. Procédé de collage de deux surfaces de bois, munies chacune de sillons, entre elles, caractérisé en ce qu'il consiste à réaliser ces sillons sur chaque surface, par déplacement et compression, au moyen d'une molette, ces sillons présentant de préférence une section triangulaire, et le pas d'un sillon à l'autre étant égal et de même valeur mesuré au fond et au sommet, à enduire ces sillons de colle, et à appliquer, sous une forte pression, les deux surfaces l'une contre l'autre. 1 1. A method of bonding two wooden surfaces, each provided with grooves, between them, characterized in that it consists in making these grooves on each surface, by displacement and compression, by means of a wheel, these grooves having preferably a triangular section, and the pitch from one groove to the other being equal and of the same value measured at the bottom and at the top, to coat these grooves with glue, and to apply, under high pressure, the two surfaces the one against the other. 1 2. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, caractérisé par le fait qu'il comporte une ou plusieurs molettes, de préférence métalliques, disposées librement sur un axe, un support maintenant le ou les molettes à une égale distance de la surface à enter, le déplacement de la ou des molettes ou de la surface à enter étant parallèle aux sillons à obtenir et perpendiculaire aux axes des molettes.2. Device for implementing the method according to claim 1, characterized in that it comprises one or more rollers, preferably metallic, freely arranged on an axis, a support holding the roll or rolls at an equal distance from the surface to be entered, the displacement of the wheel (s) or of the surface to be entered being parallel to the grooves to be obtained and perpendicular to the axes of the wheels. 3. Dispositif selon la revendication 2, caractérisé par le fait qu'une ou plusieurs molettes se déplacent, par des moyens mécaniques, à une distance constante entre son ou leurs axes et la surface d'une pièce de bois à munir de sillons.3. Device according to claim 2, characterized in that one or more knurls move, by mechanical means, at a constant distance between its or their axes and the surface of a piece of wood to be provided with grooves. 4. Dispositif selon la revendication 2, caractérisé par le fait que les planches à enter se déplacent entre deux chaînes de roulement motorisées, assurant une forte compression sur les grandes surfaces de ces planches.4. Device according to claim 2, characterized in that the boards to enter move between two motorized rolling chains, ensuring strong compression on the large surfaces of these boards.
EP82440032A 1981-10-01 1982-09-30 Method and device for glueing together two wood surfaces Withdrawn EP0077284A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118661A FR2513930A1 (en) 1981-10-01 1981-10-01 METHOD AND DEVICE FOR BONDING TWO WOOD SURFACES BETWEEN THEM
FR8118661 1981-10-01

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EP0077284A1 true EP0077284A1 (en) 1983-04-20

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EP82440032A Withdrawn EP0077284A1 (en) 1981-10-01 1982-09-30 Method and device for glueing together two wood surfaces

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EP (1) EP0077284A1 (en)
DK (1) DK431282A (en)
FR (1) FR2513930A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161371A1 (en) * 1982-11-19 1985-11-21 Raymond Burger Method and apparatus for manufacturing laminated wood by self-blocking

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262723A (en) * 1961-05-29 1966-07-26 Univ Washington Finger jointing of lumber
GB1049757A (en) * 1963-09-26 1966-11-30 Nat Res Dev Improvements in and relating to the jointing of timber and like material
GB1156144A (en) * 1965-11-22 1969-06-25 Nat Res Dev End Jointing of Timber and the like
DE1902973A1 (en) * 1969-01-22 1970-08-20 Erwin Dimter Working process for the production of finger joints on the joint surfaces of wooden workpieces to be joined by gluing using at least two tools connected in series, and a device for performing the working process
DE1528174A1 (en) * 1966-07-05 1971-01-21 Hombak Maschinenfab Kg Method and tool assembly for making extremely small finger joints
GB1279236A (en) * 1968-05-03 1972-06-28 Secretary Trade Ind Brit Improvements in or relating to method and apparatus for die-forming fingers and for finger jointing timber or like material
GB1287561A (en) * 1968-05-03 1972-08-31 Secretary Trade Ind Brit Improvements in or relating to joints between longitudinally relatively inclined pieces of timber or like material
US4248280A (en) * 1978-12-07 1981-02-03 Taylor Keith A Method and machine structure for finger jointing of lumber

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262723A (en) * 1961-05-29 1966-07-26 Univ Washington Finger jointing of lumber
GB1049757A (en) * 1963-09-26 1966-11-30 Nat Res Dev Improvements in and relating to the jointing of timber and like material
GB1156144A (en) * 1965-11-22 1969-06-25 Nat Res Dev End Jointing of Timber and the like
DE1528174A1 (en) * 1966-07-05 1971-01-21 Hombak Maschinenfab Kg Method and tool assembly for making extremely small finger joints
GB1279236A (en) * 1968-05-03 1972-06-28 Secretary Trade Ind Brit Improvements in or relating to method and apparatus for die-forming fingers and for finger jointing timber or like material
GB1287561A (en) * 1968-05-03 1972-08-31 Secretary Trade Ind Brit Improvements in or relating to joints between longitudinally relatively inclined pieces of timber or like material
DE1902973A1 (en) * 1969-01-22 1970-08-20 Erwin Dimter Working process for the production of finger joints on the joint surfaces of wooden workpieces to be joined by gluing using at least two tools connected in series, and a device for performing the working process
US4248280A (en) * 1978-12-07 1981-02-03 Taylor Keith A Method and machine structure for finger jointing of lumber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161371A1 (en) * 1982-11-19 1985-11-21 Raymond Burger Method and apparatus for manufacturing laminated wood by self-blocking

Also Published As

Publication number Publication date
DK431282A (en) 1983-04-02
FR2513930B1 (en) 1985-03-22
FR2513930A1 (en) 1983-04-08

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