WO2000031423A1 - Wood-screw or the like - Google Patents

Wood-screw or the like Download PDF

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Publication number
WO2000031423A1
WO2000031423A1 PCT/FR1999/002855 FR9902855W WO0031423A1 WO 2000031423 A1 WO2000031423 A1 WO 2000031423A1 FR 9902855 W FR9902855 W FR 9902855W WO 0031423 A1 WO0031423 A1 WO 0031423A1
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WO
WIPO (PCT)
Prior art keywords
screw
threads
screw according
slope
thread
Prior art date
Application number
PCT/FR1999/002855
Other languages
French (fr)
Inventor
Michel Ulryck
Original Assignee
Vissal S.A.
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 Vissal S.A. filed Critical Vissal S.A.
Priority to AU12778/00A priority Critical patent/AU1277800A/en
Publication of WO2000031423A1 publication Critical patent/WO2000031423A1/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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws

Definitions

  • the invention relates to a natural or artificial wood screw or similar material with improved screwing and double entry.
  • the ideal wood screw combines all of the following essential qualities, each in its highest degree. We can quote in any order:
  • the object of the present invention is to provide a screw having the maximum of qualities and therefore of advantages.
  • the invention relates to a screw more particularly intended for wood, but also for all similar materials, which is technically improved in that it has the following characteristics.
  • each of these two threads has two ramps inclined with different slopes relative to the longitudinal axis of the screw, one of which is inclined forwards at a first slope and the other which is inclined towards the rear more pronounced.
  • the front end of the screw is shaped according to a tapered and sharp point and the imprint of the rear end is of a special shape particularly well suited to the screwdriving drive by a specific bit transmitting the screwing torque without risk of release by skidding.
  • this imprint associated with a specific end-piece makes it possible to obtain a real stowage between this screwing drive element and the body of the screw.
  • the screwing is carried out easily and particularly quickly for a tightening torque lower than that necessary for other wood screws of the same caliber: it takes less effort to screw, we can mention for this purpose an improved screwing speed from 20 to 30% compared to a conventional screw, everything else being equal;
  • screwing begins at the first turn of the screw because the threads start as far as possible in front of the point end of the screw,
  • the assembly formed by the cavity and the end of the drive tool guarantees transmission of the tightening torque without risk of slipping or ejection even if the tool is tilted: one can screw without fear of ejection , even up to certain angles of inclination, in addition, the screw holds itself at the end of the tool even in the vertical position,. penetration into the wood is facilitated by the ramp on the front side of the nets and by the passage of the second net after the work of the first,
  • the body of the screw is mechanically reinforced under the head to increase the mechanical solidity in the usual rupture zone
  • the screw according to the invention is particularly well suited to so-called agglomerated panels made of pressed and glued particles of wood. These panels known for the risk of bursting during screwing require the systematic practice of pilot holes
  • FIG. 1 is a side view of the assembly of the screw
  • FIG. 2 is a plan view of the imprint
  • FIG. 3 is a perspective view of the end front of the screw showing the birth of each thread on the tip of the screw
  • FIG. 4 is a front view of the front end of the screw shown in perspective in FIG. 3,
  • FIG. 5 is a side view on a current section of the body of the screw, the screw being oriented front end to the left of the drawing board
  • FIG. 6 is an enlarged perspective view on a thread of a section of the body of the screw
  • FIG. 7 is an enlarged view of the part encircled in FIG. 6,.
  • FIG. 8 is a schematic view in longitudinal section showing the differences in slopes between the two sides of the same section of screw thread, that shown on the left giving the direction of the front end,.
  • FIG. 9 is a perspective view of the end of a drive end piece and of the screw head showing its imprint,
  • FIG 10 is a schematic view illustrating the essentials of the method of manufacturing by rolling the screw according to the invention between two flat blocks whose fixed front block is shown transparent.
  • the present invention proceeds from the general inventive idea according to which a substantial improvement to a wood screw or similar material is brought about by the presence of two successive threads developing with a longitudinal offset on the body of the same screw, the threads starting in two different places on the point, as far forward as possible, thus forming a double entry point.
  • the sides of each thread form two ramps whose slopes with respect to the longitudinal axis of the screw are different and oriented for the less pronounced slope towards the front end of the screw and for the more pronounced slope towards the rear end of the screw.
  • This asymmetrical characteristic of the flanks of the threads associated with a tapered, sharp and self-drilling and self-drilling conical point comprising the staggered births of the two threads and associated with a particularly well adapted special imprint allows faster and easier screwing and gives the screws self-drilling properties and exceptional resistance to tearing.
  • the screw according to the invention shown as a whole in FIG. 1, consists of a body 1 having a head 2, for example conical, and a conical front end 3 ending in a tapered and sharp point 4.
  • a head 2 for example conical
  • a conical front end 3 ending in a tapered and sharp point 4.
  • On this body are shaped two successive special threads 5 and 6 offset longitudinally between them and starting with a birth respectively 7 or 8 in two different places on the front end at point 4 of the screw.
  • two geometrically identical threads Regarding their longitudinal offset along the axis of the screw, it is preferably chosen equal to half a screw pitch.
  • births 7 and 8 of the two threads existing on the tapered and sharp point 4 of the screw are offset longitudinally between them for example, as in the case of the variant shown, as far forward as possible from the point of the screw .
  • Each thread of the two identical threads 5 and 6 present on the screw is a special composite thread formed by two non-identical sides, one 9 at the front and the other 10 at the rear.
  • slopes of the sides of these two composite threads 5 and 6 are of different inclination relative to the longitudinal axis 11 of the screw. We distinguish for each composite thread 5 and 6 a front flank 9 along a first slope and a rear flank 10 along a second, more pronounced inclination slope.
  • first slope is meant a slope with downward inclination towards the front and by second slope a slope with downward inclination towards the rear.
  • the rolling process will be preferred, which is both more economical and more efficient in terms of the quantity produced while retaining good quality.
  • a few values of inclination of the asymmetrical slopes will be indicated below with reference to the angles ⁇ and ⁇ representing the slopes of inclination of the sides of the threads with respect to the longitudinal axis 11 of the screw respectively for the front flank 9 and rear flank 10.
  • the front slope it is an inclination relative to the longitudinal axis 11 of the screw between 60 ° and 70 °, preferably 62 °.
  • the values of greatest inclination with respect to the axis 11 are between 70 ° and 80 °, preferably 78 °.
  • the angle of opening of the flanks from the edge 12 for joining the flanks of the threads is between 30 ° and 50 °, preferably equal to 40 °.
  • the body 1 of the screw and therefore the envelope volume of the threads 5 and 6 tapers at a point 4 towards the front in a conical shape with a small opening angle (gamma) whose value is between 20 ° and 30 °, preferably 25 °.
  • the threads continue as far mechanically as possible forward until the end of the tapered and sharp point 4 of the screw constituting a double entry with self-drilling and self-drilling effect.
  • the births 7 and 8 of the threads 5 and 6 already offset longitudinally can be offset more angularly, for example but not necessarily by a half turn of the screw ( Figures 2, 3 and 4).
  • This conformation associated with the tapered and sharp point must make it possible to carry out an initial marking of perforation sufficient in the wood to ensure the possibility of a self-maintenance of the screw in straight position and then to form a continuous self-drilling in the wood facilitating the penetration.
  • This conformation of the tip 4 thus provides a drilling effect in the manner of a drill.
  • the screw according to the invention can be put in place without prior drilling because its tapered and sharp point carrying the grooves 7 and 8 of the threads combined with the composite threads 5 and 6 with two asymmetrical flanks 9 and 10 allows easy, rapid penetration and without damage to wood or similar material.
  • each thread 5 or 6 which is less inclined than that of conventional screws, ensures a smooth and progressive easier penetration into the wood, thus avoiding any risk of splitting, the work of the first thread 5 being completed at each turn of the screw with that of the second thread 6 which immediately follows it.
  • the rear flank 10 which is of a more pronounced slope provides a good quality anchoring, that is to say a tear resistance greater than that of a conventional screw.
  • Each composite thread 5 or 6 has a pitch P preferably constant. Its value depends on the type of application, the material and the dimensions of the screw. By way of example, mention may be made, with manufacturing tolerances, of a pitch P of 3.6 mm for a screw of useful diameter 4 mm and a pitch P of 5.2 mm for a screw of useful diameter 6 mm.
  • this zone is produced according to a mechanical form of reinforcement or treated to have greater mechanical resistance. It has for example a conical shape instead of a cylindrical opening angle looking towards the head, giving this area greater mechanical strength. The conventional rupture frequently occurring at this location during an abnormal resistance to penetration or removal is thus greatly reduced, or even avoided.
  • the head of the screw 2 has a special imprint 14 making it possible to transmit the tightening torque without the risk of slipping or ejection even when the axis of the instrument or of the drive end piece and that of the screw are not aligned.
  • This imprint 14 is in the form of a flared cavity with cross section of the cruciform type. It opens upwards by a geometric figure 16 with four branches separating two groups 17 and 18 with two locating lines.
  • the end walls of the branches of this cavity are converging planes descending towards a bottom 19 in a bowl.
  • connection surfaces of these planes are rectangular dihedrons such as 20 with rounded edges 21.
  • the assembly allows a blocking support for the end structures of the cruciform head 22 of the endpiece 15 or of the screwing instrument.
  • this end has a suitable cruciform conformation, the flanks of the front parts of the wings of which include relief patterns such as 23 for example transverse ridges 24 as shown in FIG. 9.
  • the particular screw according to the invention is produced entirely by rolling.
  • two rolling combs are used in the form of two flat blocks 25 and 26 of the type of those shown in FIG. 10.
  • One of the combs is fixed, for example the one arranged towards the front, and the opposite comb 26 is movable in translation along the first.
  • the respective faces 27 and 28 facing the two combs 25 and 26 have suitable reliefs 29 and 30 for producing the desired technical shapes by cold pressing-rolling in the metal of the screw.
  • the screw is shaped from a blank 31 with a cylindrical body and a flared head brought to a predefined level in a position allowing the conformation by rolling between the two flat blocks serving as combs.
  • the cylindrical body of the blank 31 sandwiched between the two opposite faces of the two blocks serving as combs is pressed and rolled along these faces, movement during which the reliefs 29 and 30 presented by the working faces cold printing in the metal of the blank 31.
  • the movable block 26 drives the screw in rotation on itself and against the shaping faces of each of the blocks. During this movement the two threads are formed simultaneously in the body of the screw. In the vicinity of the end of the body of the screw, the material is expelled towards the outside during the formation of the tip 4, resulting in the formation of a drop which becomes detached at the end of the stroke.
  • the screw is thus fully formed in a single pass and leaves the grip of the combs, namely by the comb for which the distance between the initial position of the screw and the transverse end of the block is the smallest when crossing this transverse end. . After this crossing, it escapes by gravity to fall into a collector from where it is evacuated to the subsequent treatment stations and the control, conditioning and packaging stations.
  • the feed speed depends on the material and the capacity of the machine.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Joining Of Building Structures In Genera (AREA)
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Abstract

The invention concerns a wood-screw characterised in that it comprises two identical threads (5) and (6) longitudinally offset. Each of them consisting of two unsymmetrical flanks, one in front (9) along a first slope and the other at the rear (10) along a steeper slope. The threads start the furthest possible towards the front of the tip (4).

Description

VISABOIS OUANALOGUE VISABOIS OUANALOGUE
L'invention se rapporte à une vis à bois naturel ou artificiel ou matériau analogue à vissage amélioré et à double entrée.The invention relates to a natural or artificial wood screw or similar material with improved screwing and double entry.
La vis à bois idéale regroupe toutes les qualités essentielles suivantes et ceci chacune dans son degré le plus fort. On peut citer dans un ordre quelconque :The ideal wood screw combines all of the following essential qualities, each in its highest degree. We can quote in any order:
. la résistance mécanique du corps de la vis qui conditionne sa tenue au couple de vissage, . la vitesse de pénétration qui dépend du pas, de la grandeur et de la forme technique des filets et de la facilité d ' autopénétration,. the mechanical resistance of the body of the screw which conditions its resistance to the tightening torque,. the speed of penetration which depends on the pitch, the size and the technical form of the nets and the ease of self - penetration,
. la facilité d ' autopénétration permettant un moindre couple de vissage, . le caractère autotaraudant du corps de la vis, . l'ancrage, c'est-à-dire la résistance à l'arrachement,. the ease of self-penetration allowing a lesser tightening torque,. the self-tapping nature of the screw body,. the anchorage, that is to say the resistance to tearing,
. l'aptitude à ne pas faire éclater le bois lors de la pénétration, même sans avant-trou, . le bon maintien de l'outil d'entraînement dans la tête de vis, . les coûts de fabrication et de matière qui doivent cadrer avec le prix du marché pour le type concerné de vis.. the ability not to burst the wood during penetration, even without a pilot hole,. the good maintenance of the drive tool in the screw head,. manufacturing and material costs which must be in line with the market price for the type of screw concerned.
Certains avantages supplémentaires tels que la facilité de pénétration de la pointe, son automaintien avant vissage et surtout sa fonction initiale d*autoperçage méritent aussi d'être signalés.Certain additional advantages such as the ease of penetration of the point, its self-maintenance before screwing and especially its initial self-drilling function also deserve to be pointed out.
La présente invention a pour but de fournir une vis présentant le maximum de qualités et donc d'avantages. L'invention concerne une vis plus particulièrement destinée au bois, mais aussi à tous les matériaux analogues, qui est techniquement améliorée en ce qu'elle comporte les caractéristiques ci-après.The object of the present invention is to provide a screw having the maximum of qualities and therefore of advantages. The invention relates to a screw more particularly intended for wood, but also for all similar materials, which is technically improved in that it has the following characteristics.
Elle présente sur tout le long de son corps deux filets identiques et décalés longitudinalement . Les naissances des deux filets se trouvent sur la pointe de la vis le plus à l'avant possible réalisant ainsi une double entrée qui lui confère une fonction d ' autoperçage particulièrement appréciée des professionnels . Chacun de ces deux filets présente deux rampes inclinées de pentes différentes par rapport à l'axe longitudinal de la vis dont l'une vers l'avant inclinée selon une première pente et l'autre vers l'arrière inclinée de façon plus prononcée. L'extrémité avant de la vis est conformée selon une pointe effilée et acérée et l'empreinte de l'extrémité arrière est de forme spéciale particulièrement bien adaptée à l'entraînement de vissage par un embout spécifique transmettant le couple de vissage sans risque de dégagement par dérapage. De plus, cette empreinte associée à un embout spécifique permet d'obtenir un véritable arrimage entre cet élément d'entraînement de vissage et le corps de la vis. Ces caractéristiques confèrent à la vis selon l'invention de nombreux avantages.It has on all along its body two identical threads and offset longitudinally. The births of the two threads are on the tip of the screw as far forward as possible, thus achieving a double entry which gives it a self-drilling function particularly appreciated by professionals. Each of these two threads has two ramps inclined with different slopes relative to the longitudinal axis of the screw, one of which is inclined forwards at a first slope and the other which is inclined towards the rear more pronounced. The front end of the screw is shaped according to a tapered and sharp point and the imprint of the rear end is of a special shape particularly well suited to the screwdriving drive by a specific bit transmitting the screwing torque without risk of release by skidding. In addition, this imprint associated with a specific end-piece makes it possible to obtain a real stowage between this screwing drive element and the body of the screw. These characteristics give the screw according to the invention numerous advantages.
On peut citer parmi ceux-ci la récapitulation non exhaustive ci-après :These include the following non-exhaustive summary:
. le vissage s'effectue facilement et particulièrement rapidement pour un couple de vissage inférieur à celui nécessaire aux autres vis à bois du même calibre : il faut moins d'effort pour visser, on peut citer à cet effet une vitesse de vissage améliorée de 20 à 30% par rapport à une vis classique, toute chose étant égale par ailleurs ;. the screwing is carried out easily and particularly quickly for a tightening torque lower than that necessary for other wood screws of the same caliber: it takes less effort to screw, we can mention for this purpose an improved screwing speed from 20 to 30% compared to a conventional screw, everything else being equal;
. le vissage débute dès le premier tour de vis car les filets commencent le plus loin possible à l'avant de l'extrémité en pointe de la vis,. screwing begins at the first turn of the screw because the threads start as far as possible in front of the point end of the screw,
. l'ensemble formé par l'empreinte et l'extrémité de l'outil d'entraînement garantit une transmission du couple de vissage sans risque de dérapage ou d'éjection même si l'outil est incliné : on peut visser sans craindre l'éjection, même jusqu'à certains angles d'inclinaison, de plus, la vis tient toute seule au bout de l'outil même en position verticale, . la pénétration dans le bois est facilitée par la rampe du flanc avant des filets et par le passage du deuxième filet après le travail du premier,. the assembly formed by the cavity and the end of the drive tool guarantees transmission of the tightening torque without risk of slipping or ejection even if the tool is tilted: one can screw without fear of ejection , even up to certain angles of inclination, in addition, the screw holds itself at the end of the tool even in the vertical position,. penetration into the wood is facilitated by the ramp on the front side of the nets and by the passage of the second net after the work of the first,
. la meilleure résistance à l'arrachement est apportée par une pente plus prononcée du flanc arrière des filets, cette résistance à l'arrachement s'avère exceptionnelle,. the best resistance to tearing is brought by a more pronounced slope of the rear flank of the nets, this resistance to tearing is exceptional,
. la facilité de pénétration permet un vissage rapide sans dommage pour le bois,. the ease of penetration allows rapid screwing without damaging the wood,
. le corps de la vis est renforcé mécaniquement sous la tête pour augmenter la solidité mécanique dans la zone habituelle de rupture,. the body of the screw is mechanically reinforced under the head to increase the mechanical solidity in the usual rupture zone,
La vis selon l'invention est particulièrement bien adaptée aux panneaux dits agglomérés constitués de particules de bois pressées et collées. Ces panneaux connus pour le risque d'éclatement lors du vissage nécessitent la pratique systématique d'avant-trousThe screw according to the invention is particularly well suited to so-called agglomerated panels made of pressed and glued particles of wood. These panels known for the risk of bursting during screwing require the systematic practice of pilot holes
En utilisant la vis selon l'invention, on enfonce légèrement la vis et on visse de façon aisée et rapide sans aucun avant-trou. D'autres caractéristiques et avantages de l'invention apparaîtront dans la description qui suit, donnée à titre d'exemple non limitatif en référence au dessin dans lequel :Using the screw according to the invention, the screw is slightly driven in and screwed in easily and quickly without any pilot hole. Other characteristics and advantages of the invention will appear in the description which follows, given by way of nonlimiting example with reference to the drawing in which:
. la figure 1 est une vue de profil de l'ensemble de la vis,. FIG. 1 is a side view of the assembly of the screw,
. la figure 2 est une vue en plan de l'empreinte,. FIG. 2 is a plan view of the imprint,
. la figure 3 est une vue en perspective de l'extrémité avant de la vis montrant la naissance de chaque filet sur la pointe de la vis, . la figure 4 est une vue de face de l'extrémité avant de la vis représentée en perspective sur la figure 3, . la figure 5 est une vue de profil sur un tronçon courant du corps de la vis, la vis étant orientée extrémité avant vers la gauche de la planche de dessin, . la figure 6 est une vue agrandie en perspective sur un filet d'un tronçon du corps de la vis,. Figure 3 is a perspective view of the end front of the screw showing the birth of each thread on the tip of the screw,. FIG. 4 is a front view of the front end of the screw shown in perspective in FIG. 3,. FIG. 5 is a side view on a current section of the body of the screw, the screw being oriented front end to the left of the drawing board,. FIG. 6 is an enlarged perspective view on a thread of a section of the body of the screw,
. la figure 7 est une vue agrandie de la partie encerclée sur la figure 6, . la figure 8 est une vue schématique en coupe longitudinale montrant les différences de pentes entre les deux flancs d'un même tronçon de filet de vis, celle représentée sur la partie gauche donnant la direction de l'extrémité avant, . la figure 9 est une vue en perspective de l'extrémité d'un embout d'entraînement et de la tête de vis montrant son empreinte,. FIG. 7 is an enlarged view of the part encircled in FIG. 6,. FIG. 8 is a schematic view in longitudinal section showing the differences in slopes between the two sides of the same section of screw thread, that shown on the left giving the direction of the front end,. FIG. 9 is a perspective view of the end of a drive end piece and of the screw head showing its imprint,
. la figure 10 est une vue schématique illustrant l'essentiel du procédé de fabrication par roulage de la vis selon l'invention entre deux blocs plats dont le bloc avant fixe est représenté transparent. La présente invention procède de l'idée générale inventive selon laquelle une amélioration sensible à une vis à bois ou matériau analogue est apportée par la présence de deux filets successifs se développant avec un décalage longitudinal sur le corps d'une même vis, les filets débutant en deux endroits différents sur la pointe, le plus loin possible vers l'avant, formant ainsi une pointe à double entrée. Les flancs de chaque filet forment deux rampes dont les pentes par rapport à l'axe longitudinal de la vis sont différentes et orientées pour la pente la moins prononcée vers 1 ' extrémité avant de la vis et pour la pente plus prononcée vers l'extrémité arrière de la vis. Cette caractéristique de dissymétrie des flancs des filets associée à une pointe conique effilée, acérée et autoperforante et autoforante comportant les naissances décalées des deux filets et associée à une empreinte spéciale particulièrement bien adaptée permet un vissage plus rapide et plus facile et confère à la vis des propriétés d' autoperforation et une résistance exceptionnelle à l'arrachement.. Figure 10 is a schematic view illustrating the essentials of the method of manufacturing by rolling the screw according to the invention between two flat blocks whose fixed front block is shown transparent. The present invention proceeds from the general inventive idea according to which a substantial improvement to a wood screw or similar material is brought about by the presence of two successive threads developing with a longitudinal offset on the body of the same screw, the threads starting in two different places on the point, as far forward as possible, thus forming a double entry point. The sides of each thread form two ramps whose slopes with respect to the longitudinal axis of the screw are different and oriented for the less pronounced slope towards the front end of the screw and for the more pronounced slope towards the rear end of the screw. This asymmetrical characteristic of the flanks of the threads associated with a tapered, sharp and self-drilling and self-drilling conical point comprising the staggered births of the two threads and associated with a particularly well adapted special imprint allows faster and easier screwing and gives the screws self-drilling properties and exceptional resistance to tearing.
La vis selon l'invention, représentée dans son ensemble sur la figure 1, est constituée d'un corps 1 présentant une tête 2 par exemple conique et une extrémité avant conique 3 se terminant en une pointe effilée et acérée 4. Sur ce corps sont conformés deux filets spéciaux 5 et 6 successifs décalés longitudinalement entre eux et débutant par une naissance respectivement 7 ou 8 en deux endroits différents sur l'extrémité avant en pointe 4 de la vis.The screw according to the invention, shown as a whole in FIG. 1, consists of a body 1 having a head 2, for example conical, and a conical front end 3 ending in a tapered and sharp point 4. On this body are shaped two successive special threads 5 and 6 offset longitudinally between them and starting with a birth respectively 7 or 8 in two different places on the front end at point 4 of the screw.
Il s'agit selon la variante préférée de deux filets géométriquement identiques. En ce qui concerne leur décalage longitudinal suivant l'axe de la vis, celui-ci est choisi de préférence égal à un demi pas de vis.According to the preferred variant, two geometrically identical threads. Regarding their longitudinal offset along the axis of the screw, it is preferably chosen equal to half a screw pitch.
Les naissances 7 et 8 des deux filets existant sur la pointe effilée et acérée 4 de la vis sont décalées longitudinalement entre elles par exemple, comme dans le cas de la variante représentée, le plus loin possible vers l'avant de la pointe de la vis.Births 7 and 8 of the two threads existing on the tapered and sharp point 4 of the screw are offset longitudinally between them for example, as in the case of the variant shown, as far forward as possible from the point of the screw .
Chaque filet des deux filets identiques 5 et 6 présents sur la vis est un filet spécial composite formé de deux flancs non identiques l'un 9 à l'avant et l'autre 10 à l'arrière.Each thread of the two identical threads 5 and 6 present on the screw is a special composite thread formed by two non-identical sides, one 9 at the front and the other 10 at the rear.
Les pentes des flancs de ces deux filets composites 5 et 6 sont d'inclinaison différente par rapport à l'axe longitudinal 11 de la vis. On distingue pour chaque filet composite 5 et 6 un flanc avant 9 selon une première pente et un flanc arrière 10 selon une deuxième pente d'inclinaison plus prononcée.The slopes of the sides of these two composite threads 5 and 6 are of different inclination relative to the longitudinal axis 11 of the screw. We distinguish for each composite thread 5 and 6 a front flank 9 along a first slope and a rear flank 10 along a second, more pronounced inclination slope.
Par première pente on désigne une pente à inclinaison descendante vers l'avant et par deuxième pente une pente à inclinaison descendante vers l'arrière.By first slope is meant a slope with downward inclination towards the front and by second slope a slope with downward inclination towards the rear.
Pour le procédé de fabrication, on préférera le procédé de roulage qui s'avère tout à la fois plus économique et plus performant en quantité fabriquée tout en gardant une bonne qualité. A titre d'exemple on indiquera ci-après quelques valeurs d'inclinaison des pentes dissymétriques en se référant aux angles ό et β représentant les pentes d'inclinaison des flancs des filets par rapport à l'axe longitudinal 11 de la vis respectivement pour le flanc avant 9 et le flanc arrière 10.For the manufacturing process, the rolling process will be preferred, which is both more economical and more efficient in terms of the quantity produced while retaining good quality. By way of example, a few values of inclination of the asymmetrical slopes will be indicated below with reference to the angles ό and β representing the slopes of inclination of the sides of the threads with respect to the longitudinal axis 11 of the screw respectively for the front flank 9 and rear flank 10.
Il s'agit pour la pente avant d'une inclinaison par rapport à l'axe longitudinal 11 de la vis comprise entre 60° et 70°, de préférence 62°. Pour la pente arrière les valeurs de plus forte inclinaison par rapport à l'axe 11 se situent entre 70° et 80°, de préférence 78°.For the front slope, it is an inclination relative to the longitudinal axis 11 of the screw between 60 ° and 70 °, preferably 62 °. For the rear slope, the values of greatest inclination with respect to the axis 11 are between 70 ° and 80 °, preferably 78 °.
L'angle d'ouverture des flancs à partir de l'arête 12 de réunion des flancs des filets est compris entre 30° et 50°, de préférence égal à 40°.The angle of opening of the flanks from the edge 12 for joining the flanks of the threads is between 30 ° and 50 °, preferably equal to 40 °.
Bien entendu, d'autres valeurs restent possibles dans la mesure où le résultat d'ensemble et les qualités techniques sont obtenus.Of course, other values remain possible insofar as the overall result and the technical qualities are obtained.
Le corps 1 de la vis et donc le volume enveloppe des filets 5 et 6 se rétrécit en pointe 4 vers l'avant selon une forme conique de petit angle d'ouverture (gamma) dont la valeur se situe entre 20° et 30°, de préférence 25°.The body 1 of the screw and therefore the envelope volume of the threads 5 and 6 tapers at a point 4 towards the front in a conical shape with a small opening angle (gamma) whose value is between 20 ° and 30 °, preferably 25 °.
Les filets se poursuivent le plus loin mécaniquement possible vers l'avant jusqu'à l'extrémité de la pointe 4 effilée et acérée de la vis constituant une double entrée à effet autoperforant et autoforant. Conformément à la variante représentée, les naissances 7 et 8 des filets 5 et 6 déjà décalées longitudinalement peuvent être décalées en plus angulairement, par exemple mais non nécessairement d'un demi tour de vis (figures 2, 3 et 4). Cette conformation associée à la pointe effilée et acérée doit permettre de réaliser un marquage de perforation initiale suffisant dans le bois pour assurer la possibilité d'un automaintien de la vis en position droite et former ensuite un autoperçage continu dans le bois facilitant la pénétration. Cette conformation de la pointe 4 procure ainsi un effet de perçage à la manière d'un foret.The threads continue as far mechanically as possible forward until the end of the tapered and sharp point 4 of the screw constituting a double entry with self-drilling and self-drilling effect. According to the variant shown, the births 7 and 8 of the threads 5 and 6 already offset longitudinally can be offset more angularly, for example but not necessarily by a half turn of the screw (Figures 2, 3 and 4). This conformation associated with the tapered and sharp point must make it possible to carry out an initial marking of perforation sufficient in the wood to ensure the possibility of a self-maintenance of the screw in straight position and then to form a continuous self-drilling in the wood facilitating the penetration. This conformation of the tip 4 thus provides a drilling effect in the manner of a drill.
Ainsi, la vis selon l'invention peut être mise en place sans perçage préalable car sa pointe effilée et acérée portant les naissances 7 et 8 des filets combinée aux filets composites 5 et 6 à deux flancs dissymétriques 9 et 10 permet une pénétration facile, rapide et sans dégâts pour le bois ou matériau analogue.Thus, the screw according to the invention can be put in place without prior drilling because its tapered and sharp point carrying the grooves 7 and 8 of the threads combined with the composite threads 5 and 6 with two asymmetrical flanks 9 and 10 allows easy, rapid penetration and without damage to wood or similar material.
Ces filets composites 5 et 6 alliés à la résistance mécanique du métal employé confèrent en plus et d'emblée à la vis un pouvoir de pénétration supérieur aux vis traditionnelles. La valeur du couple de vissage nécessaire diminue, ce qui procure une facilité et une aisance de vissage exceptionnelles sans risque de rupture dans les conditions normales d'utilisation.These composite threads 5 and 6, combined with the mechanical resistance of the metal used, give the screw more and immediately a greater penetrating power than traditional screws. The value of the required tightening torque decreases, which provides exceptional ease and ease of screwing without the risk of breakage under normal conditions of use.
De même, et en raison de la présence des deux filets et de la particularité des flancs des filets, le temps de vissage diminue par rapport à une vis traditionnelle équivalente.Similarly, and due to the presence of the two threads and the peculiarity of the sides of the threads, the screwing time decreases compared to an equivalent traditional screw.
Ces avantages proviennent de ce que le flanc avant 9 de chaque filet 5 ou 6, qui est moins incliné que celui des vis classiques, assure une pénétration facilitée progressive et en douceur dans le bois, évitant ainsi tout risque d'éclatement, le travail du premier filet 5 étant complété à chaque tour de vis par celui du deuxième filet 6 qui le suit immédiatement. Le flanc arrière 10 qui est de pente plus prononcée procure quant à lui un ancrage de bonne qualité c'est- à-dire une résistance à l'arrachement supérieure à celle d'une vis classique.These advantages come from the fact that the front flank 9 of each thread 5 or 6, which is less inclined than that of conventional screws, ensures a smooth and progressive easier penetration into the wood, thus avoiding any risk of splitting, the work of the first thread 5 being completed at each turn of the screw with that of the second thread 6 which immediately follows it. The rear flank 10 which is of a more pronounced slope provides a good quality anchoring, that is to say a tear resistance greater than that of a conventional screw.
Chaque filet composite 5 ou 6 présente un pas P de préférence constant. Sa valeur dépend du type d'application, de la matière et des dimensions de la vis. On peut citer à titre d'exemple aux tolérances de fabrication près un pas P de 3,6 mm pour une vis de diamètre utile de 4 mm et un pas P de 5,2 mm pour une vis de diamètre utile de 6 mm.Each composite thread 5 or 6 has a pitch P preferably constant. Its value depends on the type of application, the material and the dimensions of the screw. By way of example, mention may be made, with manufacturing tolerances, of a pitch P of 3.6 mm for a screw of useful diameter 4 mm and a pitch P of 5.2 mm for a screw of useful diameter 6 mm.
Bien entendu, il doit être gardé à l'esprit que la distance séparant deux tours successifs n'est égale qu'à un demi pas comme il apparaît sur les figures.Of course, it should be borne in mind that the distance separating two successive turns is only half a step as it appears in the figures.
Il existe entre la tête 2 de la vis et la fin des filets à l'extrémité arrière de la vis une zone intermédiaire de raccordement 13 dite collet assurant la transition entre la partie filetée et la tête conique 2 de la vis. Selon une des caractéristiques de l'invention, cette zone est réalisée selon une forme mécanique de renforcement ou traitée pour présenter une plus grande résistance mécanique. Elle affecte par exemple une forme conique au lieu de cylindrique à angle d'ouverture regardant vers la tête, conférant à cette zone une plus grande résistance mécanique. La rupture classique survenant fréquemment à cet endroit lors d'une résistance anormale à la pénétration ou à l'enlèvement est ainsi fortement diminuée, voire évitée.There is between the head 2 of the screw and the end of the threads at the rear end of the screw an intermediate connection zone 13 known as a collar ensuring the transition between the threaded part and the conical head 2 of the screw. According to one of the characteristics of the invention, this zone is produced according to a mechanical form of reinforcement or treated to have greater mechanical resistance. It has for example a conical shape instead of a cylindrical opening angle looking towards the head, giving this area greater mechanical strength. The conventional rupture frequently occurring at this location during an abnormal resistance to penetration or removal is thus greatly reduced, or even avoided.
La tête de la vis 2 présente une empreinte particulière 14 permettant de bien transmettre le couple de vissage sans risque de dérapage ou d'éjection même lorsque 1 ' axe de 1 ' instrument ou de 1 ' embout 15 d'entraînement et celui de la vis ne sont pas alignés. Cette empreinte 14 se présente sous la forme d'une cavité évasée à section du type cruciforme. Elle débouche vers le haut par une figure géométrique 16 à quatre branches séparant deux groupes 17 et 18 de deux traits de repérage.The head of the screw 2 has a special imprint 14 making it possible to transmit the tightening torque without the risk of slipping or ejection even when the axis of the instrument or of the drive end piece and that of the screw are not aligned. This imprint 14 is in the form of a flared cavity with cross section of the cruciform type. It opens upwards by a geometric figure 16 with four branches separating two groups 17 and 18 with two locating lines.
Les parois d'extrémité des branches de cette cavité sont des plans convergents descendant vers un fond 19 en cuvette.The end walls of the branches of this cavity are converging planes descending towards a bottom 19 in a bowl.
Les surfaces de raccordement de ces plans sont des dièdres rectangles tels que 20 à arête arrondie 21. L'ensemble permet un appui de blocage des structures d'extrémité de la tête cruciforme 22 de l'embout 15 ou de l'instrument de vissage.The connection surfaces of these planes are rectangular dihedrons such as 20 with rounded edges 21. The assembly allows a blocking support for the end structures of the cruciform head 22 of the endpiece 15 or of the screwing instrument.
Pour assurer un maintien, voire un arrimage entre l'empreinte de la tête de vis et l'extrémité de l'instrument ou de l'embout de vissage 15, cette extrémité présente une conformation cruciforme adaptée dont les flancs des parties avant des ailes comportent des motifs en relief tels que 23 par exemple des stries transversales 24 comme représenté sur la figure 9.To ensure maintenance, or even stowage, between the impression of the screw head and the end of the instrument or of the screwing bit 15, this end has a suitable cruciform conformation, the flanks of the front parts of the wings of which include relief patterns such as 23 for example transverse ridges 24 as shown in FIG. 9.
Ces structures assurent un maintien idéal entre la vis et l'embout de vissage ainsi qu'un faible risque d'éjection en cours de travail.These structures provide ideal support between the screw and the screwdriver bit as well as a low risk of ejection during work.
De plus, l'appui et la transmission du couple sont garantis même en position inclinée de l'outil ou de l'instrument de vissage.In addition, the support and the transmission of the torque are guaranteed even in the inclined position of the tool or the screwing instrument.
La vis particulière selon l'invention est fabriquée entièrement par roulage.The particular screw according to the invention is produced entirely by rolling.
Le procédé de fabrication d'une vis par roulage est connu depuis longtemps. De nombreuses vis classiques sont ainsi fabriquées car ce procédé s'avère intéressant du point de vue économique et des cadences de production.The method of manufacturing a screw by rolling has been known for a long time. Many conventional screws are thus manufactured because this process proves to be advantageous from the economic point of view and production rates.
Il semble difficile de réaliser par simple roulage un double filet jusqu'à la pointe de la vis.It seems difficult to carry out by simple rolling a double thread up to the point of the screw.
Selon l'invention, on utilise deux peignes de roulage sous la forme de deux blocs plats 25 et 26 du type de ceux représentés sur la figure 10. L'un 25 des peignes est fixe, par exemple celui disposé vers l'avant, et le peigne opposé 26 est mobile en translation le long du premier. Les faces respectives 27 et 28 en regard des deux peignes 25 et 26 présentent des reliefs appropriés 29 et 30 pour réaliser par pressage-roulage à froid dans le métal de la vis les formes techniques souhaitées. La vis est conformée à partir d'une ébauche 31 à corps cylindrique et à tête évasée amenée à un niveau prédéfini dans une position permettant la conformation par roulage entre les deux blocs plats servant de peignes. Le corps cylindrique de l'ébauche 31 pris en sandwich entre les deux faces en regard des deux blocs servant de peignes est pressé- roulé le long de ces faces, mouvement au cours duquel les reliefs 29 et 30 que présentent les faces de travail s'impriment à froid dans le métal de l'ébauche 31. Le bloc mobile 26 entraîne la vis en rotation sur elle même et contre les faces de conformation de chacun des blocs. Au cours de ce mouvement les deux filets sont formés simultanément dans le corps de la vis. Au voisinage de l'extrémité du corps de la vis, la matière est chassée vers 1 ' extérieur lors de la formation de la pointe 4 se traduisant par la formation d'une chute qui se détache en fin de course. La vis est ainsi entièrement conformée en une seule passe et sort de l'emprise des peignes à savoir par le peigne pour lequel la distance entre la position initiale de la vis et l'extrémité transversale du bloc est la plus faible en franchissant cette extrémité transversale. Passé ce franchissement, elle s'échappe par gravité pour tomber dans un collecteur d'où elle est évacuée vers les postes de traitement ultérieur et les postes de contrôle, de conditionnement et d'emballage. La vitesse d'avance est fonction de la matière et de la capacité de la machine. According to the invention, two rolling combs are used in the form of two flat blocks 25 and 26 of the type of those shown in FIG. 10. One of the combs is fixed, for example the one arranged towards the front, and the opposite comb 26 is movable in translation along the first. The respective faces 27 and 28 facing the two combs 25 and 26 have suitable reliefs 29 and 30 for producing the desired technical shapes by cold pressing-rolling in the metal of the screw. The screw is shaped from a blank 31 with a cylindrical body and a flared head brought to a predefined level in a position allowing the conformation by rolling between the two flat blocks serving as combs. The cylindrical body of the blank 31 sandwiched between the two opposite faces of the two blocks serving as combs is pressed and rolled along these faces, movement during which the reliefs 29 and 30 presented by the working faces cold printing in the metal of the blank 31. The movable block 26 drives the screw in rotation on itself and against the shaping faces of each of the blocks. During this movement the two threads are formed simultaneously in the body of the screw. In the vicinity of the end of the body of the screw, the material is expelled towards the outside during the formation of the tip 4, resulting in the formation of a drop which becomes detached at the end of the stroke. The screw is thus fully formed in a single pass and leaves the grip of the combs, namely by the comb for which the distance between the initial position of the screw and the transverse end of the block is the smallest when crossing this transverse end. . After this crossing, it escapes by gravity to fall into a collector from where it is evacuated to the subsequent treatment stations and the control, conditioning and packaging stations. The feed speed depends on the material and the capacity of the machine.

Claims

REVENDICATIONS
1. Vis à bois naturel ou artificiel ou matériau de mêmes propriétés présentant un corps (1) d'axe longitudinal (11) de forme générale cylindrique à extrémité avant conique (3) se terminant par une pointe (4) et à extrémité arrière en tête (2) de vis à empreinte (14) en forme de cavité de réception de l'extrémité d'un instrument ou d'un embout (15) de vissage, le corps de la vis comportant deux filets décalés longitudinalement entre eux caractérisée en ce que :1. Natural or artificial wood screw or material of similar properties having a body (1) of longitudinal axis (11) of generally cylindrical shape with conical front end (3) ending in a point (4) and with rear end in head (2) of impression screw (14) in the form of a cavity for receiving the end of an instrument or of a screwing bit (15), the body of the screw comprising two threads offset longitudinally between them, characterized in what:
. les deux filets (5) et (6) décalés longitudinalement entre eux que présente le corps (1) de la vis sont semblables ou identiques,. the two threads (5) and (6) offset longitudinally between them which the body (1) of the screw has, are similar or identical,
. les pentes d'inclinaison des deux flancs avant (9) et arrière (10) de chaque filet (5) et (6) sont différentes entre elles, . la naissance (7) ou (8) de chaque filet (5) ou (6) est située sur la pointe avant (4) de la vis,. the inclination slopes of the two front (9) and rear (10) sides of each net (5) and (6) are different from each other,. the opening (7) or (8) of each thread (5) or (6) is located on the front point (4) of the screw,
. la pointe avant (4) présente un petit angle d'ouverture, . la zone de raccordement (13) entre la tête (2) et le corps (1) de la vis est traitée pour être mécaniquement résistante,. the front point (4) has a small opening angle,. the connection zone (13) between the head (2) and the body (1) of the screw is treated to be mechanically resistant,
. l'empreinte (14) est du type cruciforme à parois ajustées à l'extrémité de l'instrument ou de l'embout (15) de vissage à branches avec reliefs (23) de telle façon que la vis tienne toute seule après engagement sur l'extrémité de l'instrument ou de l'embout de vissage pendant les phases précédant le vissage.. the recess (14) is of the cruciform type with walls fitted at the end of the instrument or of the screw-on endpiece (15) with branches with reliefs (23) so that the screw holds on its own after engagement on the end of the instrument or the screwdriver bit during the phases preceding the screwing.
2. Vis selon la revendication 1 caractérisée en ce que les deux filets (5) et (6) sont identiques. 2. Screw according to claim 1 characterized in that the two threads (5) and (6) are identical.
3. Vis selon la revendication précédente caractérisée en ce que le pas des deux filets (5) et (6) est identique. 3. Screw according to the preceding claim characterized in that the pitch of the two threads (5) and (6) is identical.
4. Vis selon l'une quelconque des revendications précédentes caractérisée en ce que les deux filets (5) et (6) sont décalés longitudinalement selon l'axe longitudinal (11) de la vis. 4. Screw according to any one of the preceding claims, characterized in that the two threads (5) and (6) are offset longitudinally along the longitudinal axis (11) of the screw.
5. Vis selon l'une quelconque des revendications précédentes caractérisée en ce que la pente la moins prononcée des flancs de chaque filet est celle du flanc avant (9) c'est-à-dire celle dirigée vers la pointe avant (4) . 5. Screw according to any one of the preceding claims, characterized in that the least pronounced slope of the flanks of each thread is that of the front flank (9), that is to say that directed towards the front point (4).
6. Vis selon la revendication précédente caractérisée en ce que l'angle de pente par rapport à l'axe longitudinal (11) de la vis du flanc avant (4) de filet de pente moins prononcée est situé entre 60° et 70°. 6. Screw according to the preceding claim characterized in that the angle of slope relative to the longitudinal axis (11) of the screw of the front flank (4) of less pronounced slope thread is located between 60 ° and 70 °.
7. Vis selon la revendication précédente caractérisée en ce que l'angle de pente par rapport à l'axe longitudinal (11) de la vis du flanc avant (9) est de 62° .7. Screw according to the preceding claim characterized in that the angle of slope with respect to the longitudinal axis (11) of the screw of the front flank (9) is 62 °.
8. Vis selon l'une quelconque des revendications précédentes de 1 à 5 caractérisée en ce que la pente plus prononcée des flancs de chaque filet8. Screw according to any one of the preceding claims from 1 to 5, characterized in that the steeper slope of the sides of each thread
(5) et (6) est celle du flanc arrière (10), c'est-à- dire celle dirigée vers l'extrémité arrière de la vis.(5) and (6) is that of the rear flank (10), that is to say that directed towards the rear end of the screw.
9. Vis selon la revendication précédente caractérisée en ce que l'angle de pente par rapport à l'axe longitudinal (11) de la vis du flanc arrière (10) de chaque filet est situé entre 70° et 80°.9. Screw according to the preceding claim characterized in that the angle of slope with respect to the longitudinal axis (11) of the rear flank screw (10) of each thread is located between 70 ° and 80 °.
10. Vis selon la revendication précédente caractérisée en ce que l'angle de pente du flanc arrière (10) de chaque filet est de 78°.10. Screw according to the preceding claim characterized in that the slope angle of the rear flank (10) of each thread is 78 °.
11. Vis selon l'une quelconque des revendications précédentes caractérisée en ce que les naissances (7) et (8) respectivement des filets (5) et11. Screw according to any one of the preceding claims, characterized in that the grooves (7) and (8) respectively of the threads (5) and
(6) sont situées le plus près possible de la pointe avant (4) de la vis.(6) are located as close as possible to the front point (4) of the screw.
12. Vis selon les revendications 1 et 11 caractérisée en ce que l'angle d'ouverture de la pointe (4) est compris entre 20° et 30°.12. Screw according to claims 1 and 11 characterized in that the opening angle of the tip (4) is between 20 ° and 30 °.
13. Vis selon la revendication précédente caractérisée en ce que l'angle d'ouverture de la pointe (4) est égal à 25°. 13. Screw according to the preceding claim characterized in that the opening angle of the tip (4) is equal to 25 °.
14. Vis selon la revendication 1 caractérisée en ce que la zone de raccordement (13) entre la fin des filets (5) et (6) et la tête (2) de la vis est traitée ou de forme telle qu'elle présente des caractéristiques de meilleure résistance mécanique. 14. Screw according to claim 1 characterized in that the connection zone (13) between the end of the threads (5) and (6) and the head (2) of the screw is treated or shaped such that it has characteristics of better mechanical resistance.
15. Vis selon la revendication précédente caractérisée en ce que la zone intermédiaire de raccordement (13) est conique à angle d'ouverture regardant vers la tête (2) .15. Screw according to the preceding claim characterized in that the intermediate connection zone (13) is conical at an opening angle looking towards the head (2).
16. Procédé de fabrication d'une vis à bois selon l'une quelconque des revendications précédentes caractérisé en ce que l'on utilise deux peignes (25) et (26) conformés en blocs plats disposés parallèles entre eux, les grandes faces se regardant présentant des reliefs appropriés, et en ce que l'un (26) des blocs est animé d'un mouvement de translation par rapport à l'autre bloc (25) qui est fixe, l'ébauche (31) de la vis introduite entre les deux blocs étant conformée par pressage-roulage entre ces deux blocs jusqu'à sa sortie de leur emprise en fin de roulage. 16. Method for manufacturing a wood screw according to any one of the preceding claims, characterized in that two combs (25) and (26) are used which are formed into flat blocks arranged parallel to each other, the large faces looking at each other having appropriate reliefs, and in that one (26) of the blocks is driven in a translational movement relative to the other block (25) which is fixed, the blank (31) of the screw introduced between the two blocks being shaped by pressing-rolling between these two blocks until it leaves their grip at the end of rolling.
PCT/FR1999/002855 1998-11-19 1999-11-19 Wood-screw or the like WO2000031423A1 (en)

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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR98/14689 1998-11-19
FR9814689A FR2786229B1 (en) 1998-11-19 1998-11-19 WOOD SCREW OR THE LIKE WITH IMPROVED SCREWS AND TWO INPUTS

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WO (1) WO2000031423A1 (en)

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CN102439323A (en) * 2009-05-22 2012-05-02 菲利普螺丝公司 Low energy screws for wood and similar materials
US9297402B2 (en) 2009-05-22 2016-03-29 Phillips Screw Company Low energy screws for wood and similar materials
US9903406B2 (en) 2009-05-22 2018-02-27 Phillips Screw Company Low energy screws for wood and similar materials
US10371193B2 (en) 2009-05-22 2019-08-06 Phillips Screw Company Low energy screws for wood and similar materials
US10954990B2 (en) 2009-05-22 2021-03-23 Phillips Screw Company Low energy screws for wood and similar materials

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FR2786229A1 (en) 2000-05-26
AU1277800A (en) 2000-06-13
FR2786229B1 (en) 2001-01-26

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