FR2570140A1

FR2570140A1 - Threaded nail

Info

Publication number: FR2570140A1
Application number: FR8414017A
Authority: FR
Inventors: Jean-Pierre Dechirot
Original assignee: Vynex SA
Current assignee: Vynex SA
Priority date: 1984-09-12
Filing date: 1984-09-12
Publication date: 1986-03-14
Also published as: FR2570140B1

Abstract

The invention relates to a threaded nail intended to be knocked in with blows of a hammer into materials to be assembled. This nail is characterised mainly in that the edge of its head 1 and its shank 2 are connected by a fillet of large radius 3 and in that the crests of two consecutive threads are connected by a rounded portion of large radius 7 and in that its tip 4 is pyramid-shaped. Application: assembling wooden, plastic, sheet metal, stone, brick, building block or other elements.

Description

La présente invention concerne un clou à tige filetée, destiné à être enfoncé à coups de marteau dans les matériaux à assembler. The present invention relates to a nail with a threaded rod, intended to be hammered into the materials to be assembled.

De tels clous existent déjà et sont utilisés par différents corps de métier. Such nails already exist and are used by different trades.

Le brevet français 2.139314 décrit un clou à tige filetée, dont la tige de vis se termine par une partie en forme de coin. French Patent 2,139,314 describes a nail with a threaded rod, the screw rod of which ends in a wedge-shaped part.

Tous ces clous fi.letés sont munis d'une tête plate, qui dépasse après enfoncement et qui rentre à l'arrachage, et d'une pointe qui rend le positionnement assez imprécis. Leur résistance à la rupture n'excède guère 50 Da.N par mm2, ce qui favorise le flambage et l'émoussage, lors de leur emploi sur des matériaux durs. Leur protection contre la corrosion n'est assurée temporairement que par une pellicule d'huile. All these fi.letés nails are provided with a flat head, which protrudes after driving in and which returns to the uprooting, and a point which makes positioning quite imprecise. Their tensile strength hardly exceeds 50 Da.N per mm2, which favors buckling and blunting, when used on hard materials. Their corrosion protection is only temporarily ensured by an oil film.

Le clou fileté à grand pas et à filets multiples selon 1 'inven- tion vise à remédier aux inconvénients cités ci.-dessus. The threaded nail with large pitch and multiple threads according to the invention aims to remedy the drawbacks mentioned above.

En effet, la tête de ce croup en forme de "trompette", ne dépasse pas en surface de l'assemblage; sa pointe très dure et très effilée, parfaitement centrée, favorise le positionnement et l'amorce du trou dans les matériaux durs; sa résistance à la rupture, de 170 DaoN par mm2,due à un traitement thermique approprié, lui confère une excellente dureté en surface et une bonne résilience à coeur, qui le rendent très résistant au flambage; sa protection contre la corrosi.on est obtenue par un bain électrolytique et un traitement de passivation; sa résistance à 1 'arra- chement est très importante, car les filets ne cassent pas, mais déforment les fibres du bois; sa pénétration en hélice façonne un contre-filet, évi.te le fendage et assure un meilleur guidage. Indeed, the head of this croup in the shape of a "trumpet" does not protrude on the surface of the assembly; its very hard and very tapered tip, perfectly centered, favors the positioning and the initiation of the hole in hard materials; its tensile strength of 170 DaoN per mm2, due to an appropriate heat treatment, gives it excellent surface hardness and good core toughness, which make it very resistant to buckling; its protection against corrosion is obtained by an electrolytic bath and a passivation treatment; its resistance to tearing is very important, because the threads do not break, but deform the fibers of the wood; its helical penetration shapes a strip, avoids splitting and provides better guidance.

Ce clou fileté se caractérise principalement en ce que le bord de sa tête et sa ti.ge sont réunis par un congé de grand rayon, en ce que les sommets de deux filets consécutifs sont réuni.s par une partie arrondie à grand rayon et en ce que sa pointe est de section pyramidale. This threaded nail is mainly characterized in that the edge of its head and its rod are joined by a leave of large radius, in that the vertices of two consecutive threads are joined together by a rounded part with large radius and that its tip is of pyramidal section.

Son filetage est à multiple filets et sa section transversale, au niveau de sa partie filetée affecte la forme d'un polygone à côtés incurvés vers l'intérieur. Its thread is multi-threaded and its cross section, at the level of its threaded part, takes the form of a polygon with sides curved inwards.

Il subît un traitement thermique au,sel, et est protégé de la corrosion par un traitement électrolytique approprié. It undergoes heat treatment with salt and is protected from corrosion by an appropriate electrolytic treatment.

D'autres caractéristiques et avantages apparaitront dans la description qui va suivre d'un clou fileté, à quatre filets, selon l'inven- tion, donné à titre d'exemple non limitatif, au regard du dessin annexé représentant
- Sur la figure 1, une vue en élévation du clou.Other characteristics and advantages will appear in the following description of a threaded nail, with four threads, according to the invention, given by way of nonlimiting example, with regard to the appended drawing representing
- In Figure 1, an elevational view of the nail.

- Sur la figure 2, une section droite du clou au niveau de sa partie filetée. - In Figure 2, a cross section of the nail at its threaded part.

En examinant les figures 1 et 2 du dessin ci-joint, on remarque que la tête 1 du clou est reliée à la tige 2 par l'intermédiaire d'un congé à grand rayon 3, que la pointe 4 constitue une pyramide dont les angles sont dans le prolongement des filets, et que les sommets de deux filets consécutifs 5 et 6 sont réunis par une partie arrondie de grand rayon 7. By examining Figures 1 and 2 of the attached drawing, we note that the head 1 of the nail is connected to the rod 2 by means of a large radius leave 3, that the point 4 constitutes a pyramid whose angles are in the extension of the threads, and that the vertices of two consecutive threads 5 and 6 are joined by a rounded part of large radius 7.

Comme on le voit, la partie supérieure de ce clou affecte la forme d'une trompette : ce qui permet la pénétration complète de la tête en surface de l'assemblage. As we can see, the upper part of this nail takes the form of a trumpet: this allows the complete penetration of the head on the surface of the assembly.

La poi.nte pyramidale 4, prolongeant les filets, facilite la pénétration progressive, notamment sans provoquer le fendage du bbis. The pyramidal poi.nte 4, extending the threads, facilitates progressive penetration, in particular without causing splitting of the bbis.

La section polygonale de la partie filetée augmente sa résistance à la flexion et au flambage. The polygonal section of the threaded part increases its resistance to bending and buckling.

Cette pointe filetée est destinée principalement à l'assemblage d'éléments en bois, en panneaux de particules, en matière plastique, en tôle, en pierre, en parpaing, en brique ou autres matériaux. This threaded point is mainly intended for the assembly of elements in wood, particle board, plastic, sheet metal, stone, concrete block, brick or other materials.

Claims

1. Clcu threaded with large pitch and multiple threads causing its rotation during its insertion characterized in that the edge of its head (1) and its rod (2) are joined by a leave of large radius (3) in that the vertices (5 and 6) of two consecutive threads are joined by a rounded part of large radius (7) and in that its point (4) is of pyramidal shape.

2. Threaded nail according to claims 1 and 2, characterized in that its cross section, at its fi.letée part, takes the form of a polygon with sides curved inward.

3. Threaded nail according to claim 1, characterized in that the threading is obtained by rolling the steel wire.

4. Threaded nail according to claim 1, characterized in that it undergoes a heat treatment with salt.

5. Threaded nail according to claim 1, characterized in that its protection against corrosion is obtained by electrolytic treatment.