FR2689944A1 - Wood screw - has specially formed thread for wood or synthetic material that has improved anchoring properties - Google Patents
Wood screw - has specially formed thread for wood or synthetic material that has improved anchoring properties Download PDFInfo
- Publication number
- FR2689944A1 FR2689944A1 FR9204424A FR9204424A FR2689944A1 FR 2689944 A1 FR2689944 A1 FR 2689944A1 FR 9204424 A FR9204424 A FR 9204424A FR 9204424 A FR9204424 A FR 9204424A FR 2689944 A1 FR2689944 A1 FR 2689944A1
- Authority
- FR
- France
- Prior art keywords
- thread
- wood
- screw
- head
- synthetic material
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000002023 wood Substances 0.000 title claims abstract description 8
- 229920002994 synthetic fiber Polymers 0.000 title claims abstract description 5
- 238000004873 anchoring Methods 0.000 title 1
- 239000011122 softwood Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
Description
Vis pour tous types de bois naturels et reconstitués et matériaux de synthèse
La présente invention concerne une vis pour tous types de bois naturels et reconstitués et matériaux de synthèse, du type comprenant une tête avec une empreinte d'entraînement et une tige de forme générale cylindrique se terminant par une pointe, pourvue sur sa périphérie d'un filetage hélicoidal relativement profond.Screws for all types of natural and reconstituted wood and synthetic materials
The present invention relates to a screw for all types of natural and reconstituted wood and synthetic materials, of the type comprising a head with a driving imprint and a rod of generally cylindrical shape ending in a point, provided on its periphery with a relatively deep helical thread.
De telles vis sont actuellement largement utilisées dans de très nombreux domaines. Elles sont généralement pourvues d'un filet symétrique incliné d'un angle d'environ 20 à 25 à la fois du côté tête et du côté pointe. Or, on a constaté que dans certains cas, ces vis ne présentaient pas une résistance suffisante à l'arrachement, notamment lorsque le support est en un matériau particulièrement tendre. Such screws are currently widely used in many fields. They are generally provided with a symmetrical net inclined at an angle of about 20 to 25 both on the head side and on the tip side. However, it has been found that in certain cases, these screws did not have sufficient resistance to tearing, in particular when the support is made of a particularly soft material.
La présente invention a donc pour but principal de remédier à cet inconvénient et, pour ce faire, elle a pour objet une vis du type susmentionné qui se caractérise essentiellement en ce que le flan du filet côté tête est sensiblement perpendiculaire à l'axe longitudinal de la vis, tandis que le flan du filet côté pointe est incliné d'un angle compris entre 30 et 40 par rapport à un plan perpendiculaire audit axe longitudinal. The main object of the present invention is therefore to remedy this drawback and, to do this, it relates to a screw of the aforementioned type which is essentially characterized in that the blank of the thread on the head side is substantially perpendicular to the longitudinal axis of the screw, while the blank of the thread on the tip side is inclined at an angle between 30 and 40 relative to a plane perpendicular to said longitudinal axis.
Dans un mode de réalisation particulier de l'invention, l'angle d'inclinaison du filet côté pointe est égal à environ 36 . In a particular embodiment of the invention, the angle of inclination of the thread on the tip side is equal to approximately 36.
Grâce à cette forme particulière asymétrique du filet, la vis présente une très grande résistance à l'arrachement, même dans les matériaux les plus tendres. En outre, la plus grande inclinaison du filet côté pointe permet de réduire sensiblement le couple de vissage, tout en facilitant la pénétration de la vis dans le support. Thanks to this particular asymmetrical shape of the thread, the screw has a very high resistance to tearing, even in the most tender materials. In addition, the greater inclination of the thread on the tip side makes it possible to reduce the tightening torque appreciably, while facilitating the penetration of the screw into the support.
De préférence, le filetage se poursuit jusqu a la pointe, ce qui permet d'améliorer le temps d'attaque du vissage. Preferably, the threading continues to the tip, which improves the attack time of the screwing.
Une forme d'exécution particulière de l'invention est décrite ci-après à titre d'exemple, en référence au dessin annexé dans lequel
- la figure 1 est une vue en élévation d'une vis conforme à l'invention
- la figure 2 est une vue de dessus de cette vis ; et
- la figure 3 est une vue en coupe à plus grande échelle suivant la ligne III-III de la figure 1. A particular embodiment of the invention is described below by way of example, with reference to the accompanying drawing in which
- Figure 1 is an elevational view of a screw according to the invention
- Figure 2 is a top view of this screw; and
- Figure 3 is a sectional view on a larger scale along the line III-III of Figure 1.
La vis représentée sur ces figures se compose essentiellement d'une tête i et d'une tige 2 de forme générale cylindrique se terminant par une pointe 3, sur laquelle est réalisé un filetage hélicoïdal 4 de profondeur relativement importante. La tête de la vis est ici de type fraisé et comporte sur sa face supérieure une empreinte d'entraînement 5 de type cruciforme. The screw shown in these figures essentially consists of a head i and a rod 2 of generally cylindrical shape ending in a point 3, on which a helical thread 4 of relatively large depth is produced. The head of the screw is here of the milled type and has on its upper face a drive imprint 5 of the cruciform type.
Un marquage spécifique en forme de + y figure. There is a specific marking in the form of +.
Par ailleurs, un cône de renforcement 6 est prévu entre la tête et la tige afin de faciliter la pénétration de la vis dans son support lorsque l'on souhaite noyer la tête. Le cas échéant, la surface inférieure conique de la tête peut être pourvue de plusieurs crans permettant de fraiser un lamage lorsque le support est constitué par un panneau stratifié. Furthermore, a reinforcing cone 6 is provided between the head and the rod in order to facilitate the penetration of the screw into its support when it is desired to drown the head. If necessary, the conical lower surface of the head can be provided with several notches making it possible to mill a counterbore when the support consists of a laminated panel.
Conformément à l'invention et ainsi qu'on peut le voir plus clairement sur la figure 3, le filetage 4 est asymétrique, contrairement aux vis de ce type actuellement sur le marché qui ont un filetage symétrique incliné d'un angle d'environ 20 à 25 . According to the invention and as can be seen more clearly in Figure 3, the thread 4 is asymmetrical, unlike screws of this type currently on the market which have a symmetrical thread inclined at an angle of about 20 to 25.
Plus précisément, le flan 7 du filet côté tête est perpendiculaire à l'axe longitudinal de la vis, tandis que le flan 8 du filet côté pointe est incliné d'un angle compris entre 30 et 40 , de préférence 36 , par rapport à un plan perpendiculaire audit axe longitudinal. More precisely, the blank 7 of the thread on the head side is perpendicular to the longitudinal axis of the screw, while the blank 8 of the thread on the tip side is inclined at an angle between 30 and 40, preferably 36, relative to a plane perpendicular to said longitudinal axis.
Grâce à cette disposition, on obtient une plus grande résistance à l'arrachement, tout en diminuant le couple de vissage. En effet, le flan du filet côté tête, qui est perpendiculaire à l'axe de la vis, annule complètement l'effet d'écartement exercé sur le support lors de l'effort d'arrachement, ce qui permet d'obtenir une résistance augmentée de 30 à 50 Z par rapport à une vis classique de même diamètre fixée dans le même support. Au contraire, la plus forte inclinaison à 36 du flan du filet côté pointe accentue très sensiblement l'effet d'écartement du support à visser et permet, par rapport à une vis classique de même diamètre et dans un même support, d'obtenir des couples de vissage diminués d'environ 10 %. Thanks to this arrangement, greater resistance to tearing is obtained, while reducing the screwing torque. Indeed, the blank on the head side of the thread, which is perpendicular to the axis of the screw, completely cancels the spreading effect exerted on the support during the tearing effort, which allows resistance to be obtained. increased from 30 to 50% compared to a conventional screw of the same diameter fixed in the same support. On the contrary, the steepest inclination at 36 of the flank of the thread on the tip side very markedly accentuates the spacing effect of the support to be screwed and allows, compared to a conventional screw of the same diameter and in the same support, tightening torques reduced by around 10%.
On notera en outre que dans la vis selon l'invention, le filetage 4 est saillant jusqu'à la pointe 3, contrairement aux vis classiques, ce qui permet de diminuer de moitié le temps d'attaque du vissage et donc d'améliorer considérablement la fiabilité d'utilisation. Note also that in the screw according to the invention, the thread 4 is protruding to the tip 3, unlike conventional screws, which allows to halve the attack time of the screwing and therefore to improve considerably reliability of use.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9204424A FR2689944B1 (en) | 1992-04-10 | 1992-04-10 | SCREWS FOR ALL TYPES OF NATURAL AND RECONSTITUTED WOOD AND SYNTHETIC MATERIALS. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9204424A FR2689944B1 (en) | 1992-04-10 | 1992-04-10 | SCREWS FOR ALL TYPES OF NATURAL AND RECONSTITUTED WOOD AND SYNTHETIC MATERIALS. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2689944A1 true FR2689944A1 (en) | 1993-10-15 |
FR2689944B1 FR2689944B1 (en) | 1995-12-01 |
Family
ID=9428730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9204424A Expired - Lifetime FR2689944B1 (en) | 1992-04-10 | 1992-04-10 | SCREWS FOR ALL TYPES OF NATURAL AND RECONSTITUTED WOOD AND SYNTHETIC MATERIALS. |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2689944B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0678678A1 (en) * | 1994-03-03 | 1995-10-25 | DERK S.p.A. | Universal screw obtained by rolling |
WO2011143733A1 (en) * | 2010-05-18 | 2011-11-24 | Walther, Uli | Screw with pull-out resistant thread normal to shank |
WO2011153619A3 (en) * | 2010-06-10 | 2012-02-02 | Grk Canada Limited | Screw with dual edge on thread |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2318088B1 (en) * | 1973-04-11 | 1974-04-11 | Altenloh, Brinck & Co, 5828 Ennepetal-Milspe | Self-tapping screw |
EP0425874A1 (en) * | 1989-10-31 | 1991-05-08 | Carlo Sala | Self-threading screw for plastics and like materials, including soft metals, having a high tearing strenght and a very low threading torque |
-
1992
- 1992-04-10 FR FR9204424A patent/FR2689944B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2318088B1 (en) * | 1973-04-11 | 1974-04-11 | Altenloh, Brinck & Co, 5828 Ennepetal-Milspe | Self-tapping screw |
EP0425874A1 (en) * | 1989-10-31 | 1991-05-08 | Carlo Sala | Self-threading screw for plastics and like materials, including soft metals, having a high tearing strenght and a very low threading torque |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0678678A1 (en) * | 1994-03-03 | 1995-10-25 | DERK S.p.A. | Universal screw obtained by rolling |
WO2011143733A1 (en) * | 2010-05-18 | 2011-11-24 | Walther, Uli | Screw with pull-out resistant thread normal to shank |
WO2011153619A3 (en) * | 2010-06-10 | 2012-02-02 | Grk Canada Limited | Screw with dual edge on thread |
US9046121B2 (en) | 2010-06-10 | 2015-06-02 | Grk Canada Ltd | Screw with dual edge on thread |
Also Published As
Publication number | Publication date |
---|---|
FR2689944B1 (en) | 1995-12-01 |
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CD | Change of name or company name |