WO1997021932A1 - Screw and composite construction comprising same - Google Patents

Screw and composite construction comprising same Download PDF

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Publication number
WO1997021932A1
WO1997021932A1 PCT/FR1996/001984 FR9601984W WO9721932A1 WO 1997021932 A1 WO1997021932 A1 WO 1997021932A1 FR 9601984 W FR9601984 W FR 9601984W WO 9721932 A1 WO9721932 A1 WO 9721932A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
flange
thread
diameter
sheet
Prior art date
Application number
PCT/FR1996/001984
Other languages
French (fr)
Inventor
Francis Ovaert
Pierre Potet
Original Assignee
Francis Ovaert
Pierre Potet
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Francis Ovaert, Pierre Potet filed Critical Francis Ovaert
Publication of WO1997021932A1 publication Critical patent/WO1997021932A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/0275—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the screw-threaded element having at least two axially separated threaded portions

Definitions

  • Screw and composite structure comprising such a screw
  • the present invention relates to composite structures in which a layer is fixed to a sheet whose reverse side is inaccessible. It applies in particular to the installation of insulating covers or facade cladding, in the building sector.
  • the main object of the invention is a screw for fixing a layer to a sheet, of the type described in the preamble to claim 1.
  • insulating blankets which have an insulating layer made up of plates and a waterproofing coating, the assembly being fixed on a roofing element made up of ribbed sheets fixed on a frame
  • self-tapping screws with countersunk head, small diameter (diameter 3 mm to diameter 6 mm), of length greater than the thickness of the insulating plates (10 to 30 mm more), fixed by means of the thread in the upper areas of the ribbed sheet, - a metal distribution washer, with a drilled and milled central bowl, of small thickness and large diameter (about 70 mm)
  • the sealing coating is then glued or welded to the upper face of the insulating plates and to the distribution washers, which are theoretically in the upper plane of the insulating plates.
  • a variant consists in using the fasteners, comprising washer and screws, after fitting a first sealing membrane; a second membrane then covers the first and the visible washers and screw heads.
  • Another variant consists in using the fasteners, comprising elongated rondel ⁇ s and the screws, at the edge of the sealing coating strip; the adjacent strip then covers the first strip and all of the washers and visible screw heads.
  • the screw can be screwed too deep into the ribbed sheet, the screw head sinking with the distribution washer, which can even bend, in the insulating plate.
  • the waterproofing coating is not applied to a continuous and flat support, which affects its proper functioning. This phenomenon is aggravated if the insulation used is very compressible, for example with sheets of mineral wool.
  • an aesthetic defect appears on the underside of the roof: the screw deforms upward the ribbed sheet area, so that it is no longer flat.
  • the screw may, under the effect of a load, for example during the movement of a person on the distribution washer and the head screws, sink into the ribbed sheet with one or more threads; the external threads of the screw have in this case enlarged the hole of the sheet, and the fixing is no longer effective.
  • the cause of the unscrewing of the screw comes from the fact that the upper end (on the side of the head) of the thread has, due to its helical shape, a surface inclined relative to the plane perpendicular to
  • the invention aims to provide a screw guaranteeing an absence of tendency to unscrewing under the effect of dynamic forces due to the wind, and at the same time offering a high tear resistance.
  • the invention relates to a screw of the aforementioned type, characterized by the characterizing part of claim 1.
  • the screw thus defined may include one or more of the features of claims 2 to 7.
  • FIG. 1 shows in section the fixing of an insulation layer on a support sheet, for the covering of a building, according to the invention
  • Figure 2 shows on a larger scale a detail of this attachment
  • FIG. 3 is a sectional view taken along line III-III of Figure 2;
  • - Figure 4 is a partial view, similar to Figure 2, of a variant;
  • Figure 5 is a partial view, similar to Figure 2, of another variant
  • FIG. 6 shows in perspective, with tearing, fixing a building facade cladding on a support frame, according to the invention.
  • Figure 7 is a sectional view along the line VU-VII of Figure 6.
  • Figure 1 shows the attachment of an insulation plate 1 of thickness e_, surmounted by a sealing membrane 2, on a steel sheet rib 3 previously fixed on the frame 4 of a building.
  • the thickness e_ is measured after possible predetermined compression of the plate 1.
  • the fixing of the plate 1 is carried out on the wave summits of the sheet 3, by means of devices 5 each consisting of an assembly member 6, which will be designated in the following by the term "screw" for more convenience, and a distribution washer 7.
  • the screws 6 and the sheet 3 have an anti-corrosion coating.
  • the screw 6 has a countersunk head 8 at its upper end, a threaded lower end part 9 and a split flange 10 located under the sheet 3, the thread and the flange being carried by the body or rod 11 of the screw.
  • the threaded part 9 is extended downwards by a self-cutting cutting tip 12.
  • the washer 7 is circular or of elongated shape and has a countersunk central hole 13 whose periphery is conjugated with the screw head 8 ( Figure 2).
  • a screw 6 is shown in detail in Figures 2 and 3.
  • the body 11 comprises, from the head 8, a smooth main part 14 whose diameter a . is substantially half the sum of the thread bottom diameter b_ of the thread 9 and the outside diameter c. of this thread.
  • This part 14 is followed by an intermediate part 15 whose diameter is reduced to a value d, slightly less than b and typically between 0.9 b_ and b_.
  • This part 15 extends to the flange 10.
  • the flange 10 has a median plane P perpendicular to the axis X-X of the screw. Its upper surface 16 is inclined downward, in meridian section, at an angle ⁇ between 0 and 20 ° and preferably less than 10 °, while its lower surface 17 is inclined upward at an angle ⁇ such that the angle ( ⁇ + ⁇ ) is less than the corresponding angle y of the thread 9.
  • the outside diameter of the flange is slightly greater than c_, and is for example equal to 1.1 c ..
  • the collar 10 On a minority fraction of its periphery, preferably extending over less than 120 ° and better still less than 90 °, the collar 10 comprises a section 18 folded down at an angle of approximately 45 °. Alternatively, this angle can be smaller and between the angle of the thread, which is typically about 20 °, and 45 °.
  • the free end of the section 18 is located roughly on the same genera ⁇ tion as the thread head 20, formed by the junction of the part 19 of the screw body and the thread 9.
  • the end of the section 18 may alternatively be located substantially in the extension of the last turn of the thread 9.
  • the height h.4 which axially separates the median plane P of the flange 10 of the last turn of the thread 9, taken angularly at 90 ° to the thread head 21, is close to the pitch p of the thread 9.
  • a higher value of l ⁇ 4 has the only drawback of lengthening the opinion.
  • the width L of the slot 18A defined by the section 18, measured perpendicular to this section, is between e_2 and 3 e.2, e_2 denoting the thickness of the sheet 3.
  • the implementation of the device 5 using an electric screwdriver comprises the following sequence of operations, assumed to be carried out along an edge of two strips of the sealing coating 2:
  • the formation of the hole 21 is accompanied by a localized increase in the thickness of the sheet 3, from e_2 to e.3, by the formation of a collar 22 projecting downwards.
  • h2 is also the height from the head 8. Consequently, the length hi + h 3 from the head 8 to the flange 10 is calculated so that when the latter is in abutment under the sheet 3, the upper surface of the screw head 8 is found to be substantially in the plane of the upper face of the washer 7.
  • the height h.3 is also significantly greater than the thickness e_3, to avoid any risk of jamming during screwing. It is understood that the screw 6 is inevitable, as well under the effect of dynamic forces due to wind, whatever their direction, as if one tries to drive it counterclockwise. Indeed, the flange 10 cannot engage upwards in the hole 21.
  • the part 15 extends above the sheet 3 over a substantial height H, for example equal to several times its diameter d.
  • H can be of the order by 5d. from the flange 10.
  • This variant allows the screw to slide freely downwards, including mant the insulating layer 1, if a person steps on his head 8.
  • Figures 6 and 7 show the application of the invention to the fixing by screws 6 of a metal cladding 24 with vertical waves on the horizontal ribs 25 of a metal frame 26, with the interposition of a flexible insulating mat 27 , for example in mineral wool, to cover a building facade.
  • the use of screws according to the invention makes it possible to compress the mattress 27 only to a predetermined extent at the location of the fasteners, as can be seen in FIG. 7, the flange 10 abutting behind the ribs 25. It is possible to thus improving the flatness of the exterior face of the cladding. It is understood that the heads 8 of the screws 6 bear directly on the cladding 24.

Abstract

A screw (6), particularly a self-drilling screw, comprising a threaded portion (9) and an upper portion (15, 16) with a diameter close to the thread root diameter (b). The upper portion comprises a flange (10) perpendicular to the screw axis (X-X), and one section (18) of the flange is angled downwards towards the threaded portion. The screw is useful for attaching an insulation layer (1) to ribbed steel sheets (3) or facade cladding.

Description

Vis et structure composite comprenant une telle vis La présente invention concerne les structures composites dans lesquelles une couche est fixée sur une tôle dont l'envers est inaccessible. Elle s'applique notamment à la mise en place de couvertures isolantes ou de bardages de façades, dans le domaine du bâtiment. Screw and composite structure comprising such a screw The present invention relates to composite structures in which a layer is fixed to a sheet whose reverse side is inaccessible. It applies in particular to the installation of insulating covers or facade cladding, in the building sector.
L'invention a principalement pour objet une vis pour la fixation d'une couche sur une tôle, du type décrit dans le préambule de la revendication 1.The main object of the invention is a screw for fixing a layer to a sheet, of the type described in the preamble to claim 1.
Si l'on considère par exemple les couvertures isolantes, qui comportent une couche isolante constituée de plaques et un revêtement d'étanchéité, 1 'ensemble étant fixé sur un élément porteur de toiture constitué de tôles nervurées fixées sur une charpente, on utilise actuellement des vis autoperceuses-taraudeuses à tête fraisée, de faible diamètre (diamètre 3 mm à diamètre 6 mm) , de longueur supérieure à l'épaisseur des plaques isolantes (10 à 30 mm de plus) , fixées par l'intermé¬ diaire du filetage dans les plages supérieures de la tôle nervurée,- une rondelle métallique de répartition, à cuvette centrale percée et fraisée, de faible épaisseur et de grand diamètre (environ 70 mm) , est interposée entre la tête de vis et la face supérieure de la plaque isolante. Le revêtement d'étanchéité est ensuite collé ou soudé sur la face supérieure des plaques isolantes et sur les rondelles de répartition, qui sont théoriquement dans le plan supérieur des plaques isolantes.If we consider for example insulating blankets, which have an insulating layer made up of plates and a waterproofing coating, the assembly being fixed on a roofing element made up of ribbed sheets fixed on a frame, we are currently using self-tapping screws with countersunk head, small diameter (diameter 3 mm to diameter 6 mm), of length greater than the thickness of the insulating plates (10 to 30 mm more), fixed by means of the thread in the upper areas of the ribbed sheet, - a metal distribution washer, with a drilled and milled central bowl, of small thickness and large diameter (about 70 mm), is interposed between the screw head and the upper face of the insulating plate . The sealing coating is then glued or welded to the upper face of the insulating plates and to the distribution washers, which are theoretically in the upper plane of the insulating plates.
Une variante consiste à mettre en oeuvre les fixations, comportant rondelle et vis, après mise en place d'une première membrane d'étanchéité; une seconde membrane recouvre ensuite la première et les rondelles et têtes de vis apparentes. Une autre variante consiste à mettre en oeuvre les fixations, comportant des rondel¬ les de forme allongée et les vis, en lisière du lé de revêtement d'étanchéité; le lé adjacent recouvre ensuite le premier lé et l'ensemble des rondelles et têtes de vis apparentes.A variant consists in using the fasteners, comprising washer and screws, after fitting a first sealing membrane; a second membrane then covers the first and the visible washers and screw heads. Another variant consists in using the fasteners, comprising elongated rondel¬s and the screws, at the edge of the sealing coating strip; the adjacent strip then covers the first strip and all of the washers and visible screw heads.
L'utilisation de telles vis est loin d'être satisfaisante : les vis sont mises en place au moyen d'une visseuse électrique, dont la vitesse de rotation est rapide et le couple élevé. Il arrive fréquemmentr, notamment si les plaques isolantes sont denses et peu compressibles et si la tôle est mince, que la vis, arrivée en butée sur sa rondelle, continue à tourner sans pouvoir s'enfoncer. De ce fait, le diamètre du trou de la tôle devient égal au diamètre extérieur des filets de la vis, et la fixation n'est plus performante.The use of such screws is far from satisfactory: the screws are put in place by means of an electric screwdriver, the speed of rotation of which is rapid and the torque high. It frequently happens, especially if the insulating plates are dense and not very compressible and if the sheet is thin, that the screw, arriving in abutment on its washer, continues to turn without being able to sink. As a result, the diameter of the hole in the sheet becomes equal to the outside diameter of the threads of the screw, and the fixing is no longer effective.
Pour les mêmes raisons, vitesse et/ou couple de vissage élevé, la vis peut se visser trop profondément dans la tôle nervurée, la tête de vis s 'enfonçant avec la rondelle de répartition, qui peut même se plier, dans la plaque isolante. Dans ce cas, le revêtement d'étan¬ chéité n'est pas appliqué sur un support continu et plat, ce qui nuit à son bon fonctionnement. Ce phénomène est aggravé si l'isolant employé est très compressible, par exemple avec des plaques de laine minérale. De plus, un défaut esthétique apparaît en sous-face de la toiture : la vis déforme vers le haut la plage de tôle nervurée, de sorte que celle-ci n'est plus plane. Par ailleurs, même si la vis est correctement mise en place, lorsque la toiture est terminée, la vis peut, sous l'effet d'une charge, par exemple lors de la circulation d'une personne sur la rondelle de répartition et la tête de vis, s'enfoncer au niveau de la tôle nervurée d'un ou plusieurs pas de vis; les filets extérieurs de la vis ont dans ce cas agrandi le trou de la tôle, et la fixation n'est plus performante.For the same reasons, high speed and / or tightening torque, the screw can be screwed too deep into the ribbed sheet, the screw head sinking with the distribution washer, which can even bend, in the insulating plate. In this case, the waterproofing coating is not applied to a continuous and flat support, which affects its proper functioning. This phenomenon is aggravated if the insulation used is very compressible, for example with sheets of mineral wool. In addition, an aesthetic defect appears on the underside of the roof: the screw deforms upward the ribbed sheet area, so that it is no longer flat. Furthermore, even if the screw is correctly installed, when the roof is finished, the screw may, under the effect of a load, for example during the movement of a person on the distribution washer and the head screws, sink into the ribbed sheet with one or more threads; the external threads of the screw have in this case enlarged the hole of the sheet, and the fixing is no longer effective.
Pour supprimer ces inconvénients et garantir une grande fiabilité de la fixation, quelle que soit la compressibilité des plaques isolantes, on a proposé (US-A-4 453 361) une vis du type précité, dans lequel le diamètre de la tige est réduit jusqu'à sensiblement le diamètre de fond de filet dans la région adjacente au filetage.To eliminate these drawbacks and guarantee high reliability of the fixing, whatever the compressibility of the insulating plates, a screw of the aforementioned type has been proposed (US-A-4,453,361), in which the diameter of the rod is reduced up to 'to substantially the diameter of the thread bottom in the region adjacent to the thread.
Cette conception présente un inconvénient sérieux. En effet, l'expérience montre que la vis n'est pas à l'abri d'un dévissage inopiné sous l'effet des vibrations, ou des dépressions, dues au vent, qui s'exercent de façon tourbillonnante sur la toiture ou les façades des bâtiments. Lorsqu'un tel dévissage se produit, après envol du revêtement d'étanchéité, le bâtiment n'est plus propre à son utilisation.This design has a serious drawback. Indeed, experience shows that the screw is not immune to unexpected unscrewing under the effect of vibrations, or depressions, due to the wind, which are exerted in a swirling fashion on the roof or the building facades. When such an unscrewing occurs, after flight of the waterproofing coating, the building is no longer suitable for its use.
La cause du dévissage de la vis vient du fait que l'extrémité supérieure (du côté de la tête) du filetage présente, du fait de sa forme hélicoïdale, une surface inclinée par rapport au plan perpendiculaire àThe cause of the unscrewing of the screw comes from the fact that the upper end (on the side of the head) of the thread has, due to its helical shape, a surface inclined relative to the plane perpendicular to
1 ' axe de la vis.1 axis of the screw.
L'invention a pour but de fournir une vis garantissant une absence de tendance au dévissage sous l'effet des efforts dynamiques dus au vent, et offrant en même temps une résistance à l'arrachement élevée.The invention aims to provide a screw guaranteeing an absence of tendency to unscrewing under the effect of dynamic forces due to the wind, and at the same time offering a high tear resistance.
A cet effet, l'invention a pour objet une vis du type précité, caractérisée par la partie caractéri¬ sante de la revendication 1.To this end, the invention relates to a screw of the aforementioned type, characterized by the characterizing part of claim 1.
La vis ainsi définie peut comporter une ou plusieurs des caractéristiques des revendications 2 à 7.The screw thus defined may include one or more of the features of claims 2 to 7.
L'invention a également pour objet une structure composite telle que définie par la revendica¬ tion 8.The subject of the invention is also a composite structure as defined by claims 8.
Deux modes de réalisation de cette structure composite sont décrits, respectivement, dans les revendi¬ cations 9 et 10. Quelques exemples de réalisation de l'in¬ vention vont maintenant être décrits en regard des dessins annexés, sur lesquels :Two embodiments of this composite structure are described, respectively, in claims 9 and 10. Some embodiments of the invention will now be described with reference to the accompanying drawings, in which:
- la Figure 1 représente en coupe la fixation d'une couche d'isolation sur une tôle support, pour la couverture d'un bâtiment, conformément à l'invention; la Figure 2 représente à plus grande échelle un détail de cette fixation;- Figure 1 shows in section the fixing of an insulation layer on a support sheet, for the covering of a building, according to the invention; Figure 2 shows on a larger scale a detail of this attachment;
- la Figure 3 est une vue prise en coupe suivant la ligne III-III de la Figure 2; - la Figure 4 est une vue partielle, analogue à la Figure 2, d'une variante;- Figure 3 is a sectional view taken along line III-III of Figure 2; - Figure 4 is a partial view, similar to Figure 2, of a variant;
- la Figure 5 est une vue partielle, analogue à la Figure 2, d'une autre variante;- Figure 5 is a partial view, similar to Figure 2, of another variant;
- la Figure 6 représente en perspective, avec arrachement, la fixation d'un bardage de façade de bâtiment sur une ossature de support, conformément à l'invention; et- Figure 6 shows in perspective, with tearing, fixing a building facade cladding on a support frame, according to the invention; and
- la Figure 7 est une vue prise en coupe suivant la ligne VU-VII de la Figure 6.- Figure 7 is a sectional view along the line VU-VII of Figure 6.
La Figure 1 représente la fixation d'une plaque d'isolation 1 d'épaisseur e_, surmontée d'une membrane d'étanchéité 2, sur une tôle d'acier nervure 3 préalablement fixée sur la charpente 4 d'un bâtiment. L'épaisseur e_ est mesurée après compression éventuelle prédéterminée de la plaque 1.Figure 1 shows the attachment of an insulation plate 1 of thickness e_, surmounted by a sealing membrane 2, on a steel sheet rib 3 previously fixed on the frame 4 of a building. The thickness e_ is measured after possible predetermined compression of the plate 1.
La fixation de la plaque 1 s'effectue sur les sommets d'ondes de la tôle 3, au moyen de dispositifs 5 constitués chacun d'un organe d'assemblage 6, qui sera désigné dans la suite par le terme "vis" pour plus de commodité, et d'une rondelle de répartition 7. Les vis 6 et la tôle 3 comportent un revêtement anti-corrosion. La vis 6 comporte une tête fraisée 8 à son extrémité supérieure, une partie d'extrémité inférieure 9 filetée et une collerette fendue 10 situées sous la tôle 3, le filetage et la collerette étant portés par le corps ou tige 11 de la vis. La partie filetée 9 est prolongée vers le bas par une pointe coupante autoper¬ ceuse 12. La rondelle 7 est circulaire ou de forme allongée et présente un trou central fraisé 13 dont la périphérie est conjuguée de la tête de vis 8 (Figure 2) . Une vis 6 est représentée en détail sur les Figures 2 et 3. Le corps 11 comprend, à partir de la tête 8, une partie principale lisse 14 dont le diamètre a. est sensiblement la demi-somme du diamètre b_ de fond de filet du filetage 9 et du diamètre extérieur c. de ce filetage. Cette partie 14 est suivie d'une partie intermédiaire 15 dont le diamètre est réduit à une valeur d, légèrement inférieure à b et typiquement comprise entre 0,9 b_ et b_. Cette partie 15 s'étend jusqu'à la collerette 10.The fixing of the plate 1 is carried out on the wave summits of the sheet 3, by means of devices 5 each consisting of an assembly member 6, which will be designated in the following by the term "screw" for more convenience, and a distribution washer 7. The screws 6 and the sheet 3 have an anti-corrosion coating. The screw 6 has a countersunk head 8 at its upper end, a threaded lower end part 9 and a split flange 10 located under the sheet 3, the thread and the flange being carried by the body or rod 11 of the screw. The threaded part 9 is extended downwards by a self-cutting cutting tip 12. The washer 7 is circular or of elongated shape and has a countersunk central hole 13 whose periphery is conjugated with the screw head 8 (Figure 2). A screw 6 is shown in detail in Figures 2 and 3. The body 11 comprises, from the head 8, a smooth main part 14 whose diameter a . is substantially half the sum of the thread bottom diameter b_ of the thread 9 and the outside diameter c. of this thread. This part 14 is followed by an intermediate part 15 whose diameter is reduced to a value d, slightly less than b and typically between 0.9 b_ and b_. This part 15 extends to the flange 10.
La collerette 10 possède un plan médian P perpendiculaire à l'axe X-X de la vis. Sa surface supérieure 16 est inclinée vers le bas, en coupe mérir- dienne, suivant un angle α compris entre 0 et 20° et de préférence inférieur à 10°, tandis que sa surface infé¬ rieure 17 est inclinée vers le haut suivant un angle β tel que l'angle (α + β) soit inférieur à l'angle corres¬ pondant y du filetage 9. Le diamètre extérieur de la collerette est légèrement supérieur à c_, et est par exemple égal à 1,1 c..The flange 10 has a median plane P perpendicular to the axis X-X of the screw. Its upper surface 16 is inclined downward, in meridian section, at an angle α between 0 and 20 ° and preferably less than 10 °, while its lower surface 17 is inclined upward at an angle β such that the angle (α + β) is less than the corresponding angle y of the thread 9. The outside diameter of the flange is slightly greater than c_, and is for example equal to 1.1 c ..
Entre la collerette 10 et le début du filetage 9 s'étend une autre partie cylindrique 19 du corps de vis 11 dont le diamètre peut être b_, d. ou une valeur quelconque intermédiaire entre ces deux diamètres.Between the flange 10 and the start of the thread 9 extends another cylindrical part 19 of the screw body 11, the diameter of which can be b_, d. or any intermediate value between these two diameters.
Sur une fraction minoritaire de son pourtour, s'étendant de préférence sur moins de 120° et mieux sur moins de 90°, la collerette 10 comporte un tronçon 18 rabattu vers le bas sous un angle d'environ 45°. En variante, cet angle peut être plus faible et compris entre l'angle du filetage, qui est typiquement d'environ 20°, et 45°. Dans l'exemple représenté, l'extrémité libre du tronçon 18 se trouve à peu près sur la même généra¬ trice que la tête de filetage 20, constituée par la jonction de la partie 19 du corps de vis et du filet 9. Cependant, comme indiqué sur la Figure 5, l'extrémité du tronçon 18 peut, en variante, se trouver sensiblement dans le prolongement de la dernière spire du filetage 9. De plus, dans l'exemple représenté, la hauteur h.4 qui sépare axialement le plan médian P de la collerette 10 de la dernière spire du filetage 9, prise angulairement à 90° de la tête de filetage 21, est voisine du pas p du filetage 9. Toutefois, une valeur supérieure de lι4 présente comme seul inconvénient d'allonger la vis. La largeur L de la fente 18A définie par le tronçon 18, mesurée perpendiculairement à ce tronçon, est comprise entre e_2 et 3 e.2, e_2 désignant l'épaisseur de la tôle 3.On a minority fraction of its periphery, preferably extending over less than 120 ° and better still less than 90 °, the collar 10 comprises a section 18 folded down at an angle of approximately 45 °. Alternatively, this angle can be smaller and between the angle of the thread, which is typically about 20 °, and 45 °. In the example shown, the free end of the section 18 is located roughly on the same genera¬ tion as the thread head 20, formed by the junction of the part 19 of the screw body and the thread 9. However, as shown in Figure 5, the end of the section 18 may alternatively be located substantially in the extension of the last turn of the thread 9. In addition, in the example shown, the height h.4 which axially separates the median plane P of the flange 10 of the last turn of the thread 9, taken angularly at 90 ° to the thread head 21, is close to the pitch p of the thread 9. However, a higher value of lι4 has the only drawback of lengthening the opinion. The width L of the slot 18A defined by the section 18, measured perpendicular to this section, is between e_2 and 3 e.2, e_2 denoting the thickness of the sheet 3.
La mise en oeuvre du dispositif 5 à l'aide d'une visseuse électrique comprend la succession d'opérations suivantes, supposées effectuées le long d'une bordure de deux lés du revêtement d'étanchéité 2:The implementation of the device 5 using an electric screwdriver comprises the following sequence of operations, assumed to be carried out along an edge of two strips of the sealing coating 2:
- mise en place de la rondelle de répartition 7 sur la face supérieure du bord d'un lé 2A de la membrane 2;- Installation of the distribution washer 7 on the upper face of the edge of a strip 2A of the membrane 2;
- mise en place de la vis 6 dans le trou 13 de la rondelle 7 et à travers le lé 2A et la couche isolante 1;- Installation of the screw 6 in the hole 13 of the washer 7 and through the strip 2A and the insulating layer 1;
- perçage d'un trou 21 dans la tôle 3 par rotation de la pointe 12; la tôle est alors déformée localement vers le bas;- drilling a hole 21 in the sheet 3 by rotation of the tip 12; the sheet is then locally deformed downwards;
- vissage de la partie filetée 9 dans le trou 21, qui se taraude, jusqu'à ce que la tête de filetage 20 ait dépassé vers le bas le trou ainsi taraudé, qui a alors le même diamètre b_ que le fond de filet de la partie filetée 9;- screwing the threaded part 9 into the hole 21, which taps, until the thread head 20 has passed downwards the hole thus tapped, which then has the same diameter b_ as the thread bottom of the threaded part 9;
- puis, comme le vissage s'effectue sous une certaine poussée axiale vers le bas, le tronçon 18 s'engage dans le trou 21, et déforme momentanément la tôle mince 3, de sorte que la collerette 10 vient se placer sous cette tôle;- Then, as the screwing takes place under a certain axial downward thrust, the section 18 engages in the hole 21, and momentarily deforms the thin sheet 3, so that the flange 10 is placed under this sheet;
- lorsque la collerette 10 se trouve sous la tôle 3, la vis tourne rapidement sur elle-même, entraînée par la visseuse, puisqu'il n'y a plus d'effort de frottement. L'opération est alors terminée.- When the flange 10 is under the sheet 3, the screw turns quickly on itself, driven by the screwdriver, since there is no more friction force. The operation is then finished.
Au cours du vissage, la formation du trou 21 s'accompagne d'une augmentation localisée de l'épaisseur de la tôle 3, de e_2 à e.3 , par formation d'un collet 22 en saillie vers le bas.During the screwing, the formation of the hole 21 is accompanied by a localized increase in the thickness of the sheet 3, from e_2 to e.3, by the formation of a collar 22 projecting downwards.
La hauteur h.1 de la partie 14 de la vis est telle que, si h.2 désigne la hauteur comprise entre le plan supérieur de la rondelle 7 et le plan inférieur de la tête 8, et h.3 désigne celle de la partie 15 du corps de vis, h.1 + h.2 + h.3 = e. + e_l + e.3 , où ≤.l désigne l'épaisseur de la tôle qui constitue la rondelle 7, ceci en tenant compte éventuellement d'une compression prédéterminée de la couche isolante 1.The height h.1 of the part 14 of the screw is such that, if h.2 denotes the height between the upper plane of the washer 7 and the lower plane of the head 8, and h.3 denotes that of the part 15 of the screw body, h.1 + h.2 + h.3 = e. + e_l + e.3, where ≤.l denotes the thickness of the sheet which constitutes the washer 7, this possibly taking into account a predetermined compression of the insulating layer 1.
Dans cet exemple, h2 est également la hauteur de la tête 8. Par suite, la longueur hi + h3 de la tête 8 à la collerette 10 est calculée de façon que lorsque cette dernière est en butée sous la tôle 3 , la surface supérieure de la tête de vis 8 se trouve sensiblement dans le plan de la face supérieure de la rondelle 7.In this example, h2 is also the height from the head 8. Consequently, the length hi + h 3 from the head 8 to the flange 10 is calculated so that when the latter is in abutment under the sheet 3, the upper surface of the screw head 8 is found to be substantially in the plane of the upper face of the washer 7.
Comme on le voit sur la Figure 2, la hauteur h.3 est par ailleurs nettement supérieure à l'épaisseur e_3 , pour éviter tout risque de coincement lors du vissage. On comprend que la vis 6 est indévissable, aussi bien sous l'effet des efforts dynamiques dus a-u vent, quelle que soit leur direction, que si l'on tente de l'entraîner dans le sens anti-horaire . En effet, la collerette 10 ne peut pas s'engager vers le haut dans le trou 21.As seen in Figure 2, the height h.3 is also significantly greater than the thickness e_3, to avoid any risk of jamming during screwing. It is understood that the screw 6 is inevitable, as well under the effect of dynamic forces due to wind, whatever their direction, as if one tries to drive it counterclockwise. Indeed, the flange 10 cannot engage upwards in the hole 21.
Lorsque tous les dispositifs 6 sont en place, le bord d'un second lé 2B de la membrane d'étanchéité 2 est enfin collé ou soudé sur le bord du premier lé et sur les rondelles 7. Dans la variante de la Figure 4, les partiesWhen all the devices 6 are in place, the edge of a second strip 2B of the sealing membrane 2 is finally bonded or welded to the edge of the first strip and to the washers 7. In the variant of FIG. 4, the parts
14 et 15 du corps de vis sont reliées non plus par un épaulement comme sur la Figure 2, mais par une partie conique 23.14 and 15 of the screw body are no longer connected by a shoulder as in FIG. 2, but by a conical part 23.
Dans la variante de la Figure 5, la partie 15 se prolonge au-dessus de la tôle 3 sur une hauteur H substantielle, égale par exemple à plusieurs fois son diamètre d.. A titre d'exemple, H peut être de l'ordre de 5d. à partir de la collerette 10. Cette variante permet à la vis de coulisser librement vers le bas, en compri- mant la couche isolante 1, si une personne marche sur sa tête 8.In the variant of FIG. 5, the part 15 extends above the sheet 3 over a substantial height H, for example equal to several times its diameter d. For example, H can be of the order by 5d. from the flange 10. This variant allows the screw to slide freely downwards, including mant the insulating layer 1, if a person steps on his head 8.
Les Figures 6 et 7 montrent l'application de l'invention à la fixation par des vis 6 d'un bardage métallique 24 à ondes verticales sur les nervures horizontales 25 d'une ossature métallique 26, avec interposition d'un matelas isolant souple 27, par exemple en laine minérale, pour revêtir une façade de bâtiment. L'utilisation de vis suivant l'invention permet de ne comprimer le matelas 27 que dans une mesure prédéterminée à l'emplacement des fixations, comme on le voit bien sur la Figure 7, la collerette 10 venant buter derrière les nervures 25. On peut ainsi améliorer la planéité de la face extérieure du bardage. On comprend que les têtes 8 des vis 6 prennent directement appui sur le bardage 24. Figures 6 and 7 show the application of the invention to the fixing by screws 6 of a metal cladding 24 with vertical waves on the horizontal ribs 25 of a metal frame 26, with the interposition of a flexible insulating mat 27 , for example in mineral wool, to cover a building facade. The use of screws according to the invention makes it possible to compress the mattress 27 only to a predetermined extent at the location of the fasteners, as can be seen in FIG. 7, the flange 10 abutting behind the ribs 25. It is possible to thus improving the flatness of the exterior face of the cladding. It is understood that the heads 8 of the screws 6 bear directly on the cladding 24.

Claims

REVENDICATIONS
1 - Vis (6) pour la fixation d'une couche (1) sur une tôle (3) , du type comprenant une tige (11) qui comporte une tête (8) d'entraînement en rotation à une extrémité et un filetage (9) à son autre extrémité, cette autre extrémité étant notamment conformée en une pointe auto-perceuse (12) , caractérisée en ce que la tige porte, entre la tête (8) et le filetage (9) , une collerette (10) , distincte du filetage, ayant un plan général (P) perpendiculaire à l'axe (X-X) de la vis et dont un tronçon (18) du pourtour est rabattu obliquement, le long de la tige, vers le filetage.1 - Screw (6) for fixing a layer (1) on a sheet (3), of the type comprising a rod (11) which comprises a head (8) for driving in rotation at one end and a thread ( 9) at its other end, this other end being in particular shaped as a self-drilling point (12), characterized in that the rod carries, between the head (8) and the thread (9), a flange (10), distinct from the thread, having a general plane (P) perpendicular to the axis (XX) of the screw and of which a section (18) of the periphery is folded obliquely, along the rod, towards the thread.
2 - Vis suivant la revendication 1, caracté- risée en ce que le diamètre extérieur de la collerette2 - Screw according to claim 1, characterized in that the outside diameter of the flange
(10) est voisin de celui (cJ du filetage (9) et de préférence légèrement supérieur à ce diamètre, notamment sensiblement égal à 1,1 fois ce diamètre.(10) is close to that (cJ of the thread (9) and preferably slightly greater than this diameter, in particular substantially equal to 1.1 times this diameter.
3 - Vis suivant la revendication 1 ou 2, caractérisée en ce que la largeur (L) de la fente de la collerette (10) , mesurée perpendiculairement à la partie rabattue (18) , est comprise entre une fois et trois fois l'épaisseur (e2) de la tôle.3 - Screw according to claim 1 or 2, characterized in that the width (L) of the slot of the flange (10), measured perpendicular to the folded part (18), is between once and three times the thickness (e2) of the sheet.
4 - Vis suivant l'une quelconque des revendi- cations 1 à 3, caractérisée en ce que le diamètre de la tige (11) , dans sa région immédiatement adjacente à la collerette (10) du côté de la tête (8) , est réduit à une valeur (d.) voisine du diamètre (bj de fond de filet et est notamment compris entre 0,9 fois et 1 fois ce diamètre.4 - Screw according to any one of claims 1 to 3, characterized in that the diameter of the rod (11), in its region immediately adjacent to the flange (10) on the side of the head (8), is reduced to a value (d.) close to the diameter (bj bottom of the thread and is in particular between 0.9 times and 1 time this diameter.
5 - Vis suivant la revendication 4, caracté¬ risée en ce que, à partir de la collerette (10) , la tige (11) conserve un diamètre constant (d.) sur une hauteur plusieurs fois supérieure à ce diamètre.5 - Screw according to claim 4, caracté¬ ized in that, from the flange (10), the rod (11) retains a constant diameter (d.) Over a height several times greater than this diameter.
6 - Vis suivant l'une quelconque des revendi¬ cations 1 à 5, caractérisée en ce que la surface (16) de la collerette (10) tournée vers la tête (8) est, en section méridienne, inclinée de moins de 20°, de préfé- rence de moins de 10°, par rapport à la direction perpen¬ diculaire à l'axe (X-X) de la vis, et/ou l'angle (α + βi formé par cette surface et par la surface opposée (17) de la collerette est inférieur à celui (y) formé par les surfaces correspondantes du filetage (9) . 7 - Vis suivant l'une quelconque des revendi¬ cations 1 à 6, caractérisée en ce que l'inclinaison dudit tronçon (18) est supérieure à celle du filetage (9) .6 - Screw according to any one of the claims 1 to 5, characterized in that the surface (16) of the flange (10) facing the head (8) is, in meridian section, inclined by less than 20 ° , preferably less than 10 °, relative to the direction perpen¬ dicular to the axis (XX) of the screw, and / or the angle (α + βi formed by this surface and by the opposite surface ( 17) of the flange is less than that (y) formed by the corresponding surfaces of the thread (9) 7 - Screw according to any one of claims 1 to 6, characterized in that the inclination of said section (18 ) is greater than that of the thread (9).
8 - Structure composite, comprenant une couche (1) fixée sur une tôle (3; 26) par au moins un dispositif de fixation (5) qui comprend d'une part une vis (6) suivant l'une quelconque des revendications 1 à8 - composite structure, comprising a layer (1) fixed on a sheet (3; 26) by at least one fixing device (5) which comprises on the one hand a screw (6) according to any one of claims 1 to
7, et d'autre part un élément de répartition (7) disposé sur ladite couche (1) et sur lequel prend appui la tête7, and on the other hand a distribution element (7) disposed on said layer (1) and on which the head is supported
(8) d'entraînement en rotation de cette vis, tandis que la collerette (10) prend appui sous la tôle.(8) for driving this screw in rotation, while the flange (10) bears under the sheet.
9 - Structure composite suivant la revendica¬ tion 8, caractérisée en ce qu'elle forme une couverture de bâtiment, ladite couche (1) étant une couche d'isolation éventuellement surmontée d'une membrane d'étanchéité (2) , la tête (8) de chaque vis (6) prenant appui sur une rondelle (7) constituant ledit élément de répartition et le dispositif de fixation (5) étant éventuellement recouvert par la membrane d'étanchéité. 10 - Structure composite suivant la revendi¬ cation 8, caractérisée en ce qu'elle forme un revêtement de façade, ladite couche (24, 27) comprenant un bardage (24) et un matelas d'isolation intermédiaire (27) à compression prédéterminée, la tôle (26) constituant une ossature de support du bardage. 9 - Composite structure according to claim 8, characterized in that it forms a building covering, said layer (1) being an insulation layer possibly surmounted by a membrane sealing (2), the head (8) of each screw (6) bearing on a washer (7) constituting said distribution element and the fixing device (5) being optionally covered by the sealing membrane. 10 - Composite structure according to claim 8, characterized in that it forms a facade covering, said layer (24, 27) comprising a cladding (24) and an intermediate insulation mat (27) with predetermined compression, the sheet (26) constituting a frame for supporting the cladding.
PCT/FR1996/001984 1995-12-11 1996-12-11 Screw and composite construction comprising same WO1997021932A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9514652A FR2742195B1 (en) 1995-12-11 1995-12-11 SCREW AND COMPOSITE STRUCTURE COMPRISING SUCH A SCREW
FR95/14652 1995-12-11

Publications (1)

Publication Number Publication Date
WO1997021932A1 true WO1997021932A1 (en) 1997-06-19

Family

ID=9485368

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1996/001984 WO1997021932A1 (en) 1995-12-11 1996-12-11 Screw and composite construction comprising same

Country Status (2)

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FR (1) FR2742195B1 (en)
WO (1) WO1997021932A1 (en)

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WO2015110376A1 (en) * 2014-01-23 2015-07-30 Sfs Intec Holding Ag Method for producing a securing arrangement, securing arrangement, and screw provided for the securing arrangement
CN109340237A (en) * 2018-11-06 2019-02-15 辽宁福瑞达建筑科技有限公司 Self-positioning drilling tail nail

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE19921542C1 (en) * 1999-05-11 2001-06-28 Duve Umformtechnik Gmbh Fastening screw

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US2321378A (en) * 1942-02-03 1943-06-08 Emmet M Green Combination screw and rivet
US4453361A (en) * 1982-04-19 1984-06-12 Construction Fasteners, Inc. Screw fastener assembly, method of providing same, and fastener suitable for use therein
AT380546B (en) * 1984-06-05 1986-06-10 Pointner Josef SCREW CONNECTION
US4900208A (en) * 1988-06-09 1990-02-13 Kaiser Norbert O Roofing fastener

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US2321378A (en) * 1942-02-03 1943-06-08 Emmet M Green Combination screw and rivet
US4453361A (en) * 1982-04-19 1984-06-12 Construction Fasteners, Inc. Screw fastener assembly, method of providing same, and fastener suitable for use therein
AT380546B (en) * 1984-06-05 1986-06-10 Pointner Josef SCREW CONNECTION
US4900208A (en) * 1988-06-09 1990-02-13 Kaiser Norbert O Roofing fastener

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015110376A1 (en) * 2014-01-23 2015-07-30 Sfs Intec Holding Ag Method for producing a securing arrangement, securing arrangement, and screw provided for the securing arrangement
US10240626B2 (en) 2014-01-23 2019-03-26 Sfs Intec Holding Ag Method for producing a securing arrangement and securing arrangement
CN109340237A (en) * 2018-11-06 2019-02-15 辽宁福瑞达建筑科技有限公司 Self-positioning drilling tail nail

Also Published As

Publication number Publication date
FR2742195B1 (en) 1998-02-27
FR2742195A1 (en) 1997-06-13

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