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WO2019194920A1 - Vis auto-taraudeuse pour béton - Google Patents

Vis auto-taraudeuse pour béton Download PDF

Info

Publication number
WO2019194920A1
WO2019194920A1 PCT/US2019/020312 US2019020312W WO2019194920A1 WO 2019194920 A1 WO2019194920 A1 WO 2019194920A1 US 2019020312 W US2019020312 W US 2019020312W WO 2019194920 A1 WO2019194920 A1 WO 2019194920A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
thread
axis
extremity
angle
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.)
Ceased
Application number
PCT/US2019/020312
Other languages
English (en)
Inventor
David LEJAULT
Jérôme COUVREUR
Philippe MILAN
Sophie QUERCY JOUVET
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to EP19708764.6A priority Critical patent/EP3775584A1/fr
Publication of WO2019194920A1 publication Critical patent/WO2019194920A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16B25/0026—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 hard non-organic material, e.g. stone, concrete or drywall
    • 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
    • F16B25/0073—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 characterised by its pitch, e.g. a varying pitch
    • 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
    • F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
    • 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
    • F16B25/0084—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 geometric details of the tip

Definitions

  • the invention relates to a self-tapping screw for concrete.
  • a self-tapping screw for concrete is a fastening component which is screwed into a pre-drilled hole in concrete.
  • the hole is drilled with a predetermined diameter, and the screw is configured to form a tapping in the peripheral wall of the hole as it is being screwed in.
  • the invention thus proposes a self-tapping screw for concrete comprising a threaded rod, of which one extremity is free and an opposite extremity is connected to a head for driving the screw causing it to rotate about its axis by means of an appropriate tool, the threaded rod comprising a core having a diameter D1 and at least one thread which extends in a helix around the core and has an external diameter D2, said at least one thread having a generally triangular or trapezoidal form in cross section in a plane passing through said axis, comprising:
  • said radius R is equal to K x (D2-D1 )/2, where K lies between 1 and 1 .5.
  • the thread thus has an asymmetrical form with parameters D2/D1 , a and R which are optimized in order to impart a good performance to the screw.
  • the advantages of this screw are numerous and include in particular:
  • the screw according to the invention may comprise one or a plurality of the following characterizing features, taken in isolation one from the other or in combination one with the other:
  • said angle a lies between 4 and 8°, and is preferably 6°
  • the screw comprises a single thread
  • the thread exhibits a pitch P between 0.9 x D1 and 1 .1 x D1 , and preferably between 0.95 x D1 and 1 .05 x D1 ,
  • the thread has the same profile for substantially its entire length and is devoid of lead teeth at its extremity situated on the side of said free extremity
  • the screw comprises at least one longitudinal flute which extends through said at least one thread and into said core, from said free extremity,
  • said at least one flute has a length of more than 2 x D1 ,
  • said at least one flute has the general form of a dihedron in cross section, in a plane perpendicular to said axis,
  • said dihedron has an angle g between 60 and 120°, preferably between 80 and 100°, and more preferably in the order of 90°,
  • said dihedron comprises a first wall extending substantially in a median longitudinal plane of said screw
  • said dihedron comprises a second wall, of which a plane first portion is substantially parallel to said axis and extends from said free extremity, and of which a second portion curved inwards in a concave manner extends between the first portion and the external periphery of the threaded rod,
  • said second portion has a radius F between 3 x D1 and 6 x D1 , and preferably between 4 x D1 and 5 x D1 , and
  • the screw comprises a single flute.
  • FIG. 1 to 3 represent a self-tapping screw for concrete according to the prior art, figures 2 and 3 being detailed views on a larger scale, - figure 4 is a schematic view in perspective of a self-tapping screw according to the invention,
  • figure 7 is a schematic view from above of the screw in figure 4,
  • figure 8 is a schematic view from below of the screw in figure 4,
  • figure 9 is a view on a larger scale of the ringed detail in figure 6, and
  • Figures 1 to 3 represent a self-tapping screw 10 for concrete according to the prior art.
  • the screw 10 is designed to be screwed into a pre-drilled hole in concrete.
  • the screw 10 comprises essentially two parts, these being a threaded rod 12 and a head 14 for driving the screw causing it to rotate about its axis A.
  • the rod 12 includes a core 16 having a diameter D1 and a thread 18 which extends in a helix around the core 16 and has an external diameter D2.
  • the thread has in cross section, in a plane passing through the axis A, a generally triangular form, of which the point forms an angle b (figure 2).
  • the thread 18 comprises a flank 18a situated to the side of the free extremity of the rod 12, which forms an angle a with the aforementioned plane (figure 2).
  • the opposite flank 18b of the thread 18 exhibits a radius of curvature R (figure 3).
  • the relationship D2/D1 is more than or equal to 1.5, the angle a is more than 10°, and the angle b is more than or equal to 60°.
  • the radius R is equal to K x (D2-D1 )/2, where K is in the order of 2.
  • Figures 4 to 8 represent a self-tapping screw 1 10 for concrete according to the invention.
  • the screw 1 10 is designed to be screwed into a pre-drilled hole in concrete.
  • the screw 1 10 comprises a threaded rod 1 12, of which one extremity is free and an opposite extremity is connected to a head 1 14 for driving the screw causing it to rotate about its longitudinal A axis by means of an appropriate tool.
  • the head in this case has a generally polygonal form, for example of type SW10, although this is in no way restrictive.
  • the rod 1 12 includes a core 1 16 having a diameter D1 and at least one thread 118 which extends in a helix around the core 1 16 and has an external diameter D2.
  • the thread has a generally triangular or trapezoidal form in cross section, in a plane passing through the axis A (figure 9).
  • This triangular or trapezoidal form includes:
  • D2/D1 is less than 1.5; and it preferably lies between 1 .3 and 1.4; - the angle a lies between 0 and 10°; it preferably lies between 4 and 8°, and more preferably it is 6°; and
  • the screw 1 10 according to the invention comprises one or a plurality of the following optimized parameters:
  • the angle b is measured between the lateral flanks, at the top of the point (that is to say at the radially external free extremity of the point), and is less than 60°; it is preferably more than 45°,
  • the thread exhibits a pitch P between 0.9 x D1 and 1 .1 x D1 , and preferably between 0.95 x D1 and 1 .05 x D1 ,
  • the point 120 exhibits a thickness e between 0.1 and 0.3 mm, and for example in the order of 0.2 mm.
  • the screw 1 10 preferably comprises a single thread 1 18, which simplifies its design.
  • the thread may have the same profile for substantially its entire length and is devoid of lead teeth at its extremity situated on the side of the free extremity.
  • the screw in this case is relatively simple to produce, for example by stamping and rolling, these being methods that are well known to a person skilled in the art.
  • the screw 1 10 thus comprises an asymmetrical thread 1 18.
  • a symmetrical thread with an angle at the tip b necessarily causes stresses that are more axial than those caused by the asymmetrical thread with the same angle b. It is possible to describe the angle (b - a), which orients the stresses in a more or less radial manner.
  • the radius R of the asymmetrical thread in relation to the equivalent straight thread with the same angle b reduces the interference with the concrete, which is represented schematically by the hatched area in figure 10.
  • the lines T1 , T2 in figure 11 show the diameters of drills that are respectively worn, that is to say having a reduced diameter, and new, that is to say having a maximum diameter.
  • the dissymmetry of the thread, with respect to the equivalent symmetrical straight thread reduces the interference with the concrete; this difference is even more important in the case of a hole drilled with a worn drill of which the external diameter would be less than D2.
  • the screw may comprise inter alia a cylindrical collar 127 for connecting the threaded rod 1 12 to the head 1 14.
  • the diameter D’ of this collar is preferably smaller than the diameter of the hole into which the screw 1 10 must be screwed.
  • the length of the collar depends in particular on the total length of the screw. D’ is more than D1 and may be less than D2.
  • This collar corresponds in general to the diameter of the cylindrical rod of the blank obtained after stamping and before rolling.
  • the free extremity of the threaded rod 1 12 may be configured as a frustum of a cone and may comprise an end face perpendicular to the axis A, of which the diameter lies between 0.75 x D1 and 0.9 x D1.
  • This frustum of a cone has a length between 0.2 x D1 and 0.3 x D1.
  • the screw 1 10 may in addition comprise at least one longitudinal flute 128, preferably a single flute, which extends through the thread 1 18 and into the core 1 16 from the free extremity of the threaded rod.
  • This flute 128 is particularly useful in situations where the concrete into which the screw is to be screwed is reinforced and contains reinforcing bars. The flute 128 would then make it easier to address these bars.
  • the flute 128 is produced by machining, for example, after the rolling operation.
  • This flute may comprise one or a plurality of the following characterizing features and/or optimized parameters:
  • the flute 128 has a length of more than 2 x D1 ,
  • the flute 128 has the general form of a dihedron 130 in cross section, in a plane perpendicular to the axis A (figure 8), - the dihedron 130 has an angle g between 60 and 120°, preferably between 80 and 100°, and more preferably in the order of 90°,
  • the dihedron 130 comprises a first wall 130a extending substantially in a median longitudinal plane of said screw
  • the dihedron 130 comprises a second wall 130b, of which a first portion 130ba plane is substantially parallel to the axis A and extends from the free extremity of the threaded rod, and a second portion 130bb is curved inwards in a concave manner and extends between the first portion and the external periphery of the threaded rod,
  • the first portion has a length L1 between 2 x D1 and 2.5 x D1 ,
  • the second portion has a radius F between 3 x D1 and 6 x D1 , and preferably between
  • the flute 128 is situated at a radial distance L2 from the axis 1 , which is between 0.3 x D1 and 0.5 x D1.
  • the drilling diameter of the hole in the concrete depends on the diameter of the screw.
  • the diameters D1 and D2 could be in the order of 5.7 mm and 7.74 mm respectively.
  • the pitch P could be 5.6 mm.
  • the rod 1 12 would then have a length between 35 and 55 mm.
  • the screw 1 10 is made of tempered steel, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)

Abstract

La vis auto-taraudeuse (110) pour béton comprend une tige filetée (112) dont une extrémité est libre et une extrémité opposée est reliée à une tête (114) permettant d'entraîner la vis pour la faire tourner autour de son axe (A) au moyen d'un outil approprié, la tige filetée comprenant un noyau (116) ayant un diamètre D1 et au moins un filetage (118) qui s'étend en hélice autour du noyau et possède un diamètre externe D2, la relation D2/D1 étant inférieure à 1,5, ledit ou lesdits fils ayant une forme générale triangulaire ou trapézoïdale en coupe transversale dans un plan passant par ledit axe, comprenant : un point libre (120) qui est radialement externe par rapport audit axe (A); une base radialement interne (122) située dans la zone dudit noyau; un premier côté formé par un flanc latéral (124) du fil situé sur un côté de ladite extrémité libre, qui est sensiblement plat et forme un angle compris entre (0) et (10) avec un plan perpendiculaire audit axe; et un second côté formé par un flanc latéral (126) du fil situé sur un côté de ladite tête, qui est incurvé de manière concave avec un rayon R égal à K x (D2-D1)/2, K étant compris entre (1) et (1,5).
PCT/US2019/020312 2018-04-06 2019-03-01 Vis auto-taraudeuse pour béton Ceased WO2019194920A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19708764.6A EP3775584A1 (fr) 2018-04-06 2019-03-01 Vis auto-taraudeuse pour béton

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1852987 2018-04-06
FR1852987A FR3079891B1 (fr) 2018-04-06 2018-04-06 Vis autotaraudeuse a beton

Publications (1)

Publication Number Publication Date
WO2019194920A1 true WO2019194920A1 (fr) 2019-10-10

Family

ID=62816744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2019/020312 Ceased WO2019194920A1 (fr) 2018-04-06 2019-03-01 Vis auto-taraudeuse pour béton

Country Status (3)

Country Link
EP (1) EP3775584A1 (fr)
FR (1) FR3079891B1 (fr)
WO (1) WO2019194920A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4166798A1 (fr) * 2021-10-15 2023-04-19 TOGE Dübel GmbH & Co. KG Vis autotaraudeuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4596904A1 (fr) * 2024-01-31 2025-08-06 Masterpiece Hardware Industrial Co., Ltd. Structure de vis anti-fissure à faible résistance

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357700B1 (fr) * 1988-01-29 1992-05-13 SFS Stadler Holding AG Vis autoforeuse et autotaraudeuse
WO1994025763A1 (fr) * 1993-05-04 1994-11-10 Firma Ludwig Hettich Schraubenfabrik Gmbh & Co. Vis a former les filetages
US6672813B1 (en) * 1999-06-28 2004-01-06 Aoyama Seisakusho Co., Ltd. Tapping screw
EP2386770A1 (fr) * 2010-05-10 2011-11-16 HILTI Aktiengesellschaft Vis à béton autotaraudeuse
WO2015022049A1 (fr) * 2013-08-13 2015-02-19 Fischerwerke Gmbh & Co. Kg Vis à béton
DE102014219116A1 (de) * 2014-09-23 2016-03-24 Toge Dübel Gmbh & Co. Kg Selbstschneidende Schraube zum Einschrauben in ein Bohrloch in einem Werkstoff, Anordnung mit einer derartigen Schraube und Verfahren zum Einschrauben einer derartigen Schraube in ein Bohrloch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357700B1 (fr) * 1988-01-29 1992-05-13 SFS Stadler Holding AG Vis autoforeuse et autotaraudeuse
WO1994025763A1 (fr) * 1993-05-04 1994-11-10 Firma Ludwig Hettich Schraubenfabrik Gmbh & Co. Vis a former les filetages
US6672813B1 (en) * 1999-06-28 2004-01-06 Aoyama Seisakusho Co., Ltd. Tapping screw
EP2386770A1 (fr) * 2010-05-10 2011-11-16 HILTI Aktiengesellschaft Vis à béton autotaraudeuse
WO2015022049A1 (fr) * 2013-08-13 2015-02-19 Fischerwerke Gmbh & Co. Kg Vis à béton
DE102014219116A1 (de) * 2014-09-23 2016-03-24 Toge Dübel Gmbh & Co. Kg Selbstschneidende Schraube zum Einschrauben in ein Bohrloch in einem Werkstoff, Anordnung mit einer derartigen Schraube und Verfahren zum Einschrauben einer derartigen Schraube in ein Bohrloch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4166798A1 (fr) * 2021-10-15 2023-04-19 TOGE Dübel GmbH & Co. KG Vis autotaraudeuse

Also Published As

Publication number Publication date
FR3079891A1 (fr) 2019-10-11
FR3079891B1 (fr) 2020-04-24
EP3775584A1 (fr) 2021-02-17

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