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FR3005705A1 - DEVICE FOR FIXING A BOLT TO A WALL WHOSE OTHER SIDE IS NOT ACCESSIBLE - Google Patents

DEVICE FOR FIXING A BOLT TO A WALL WHOSE OTHER SIDE IS NOT ACCESSIBLE Download PDF

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Publication number
FR3005705A1
FR3005705A1 FR1301149A FR1301149A FR3005705A1 FR 3005705 A1 FR3005705 A1 FR 3005705A1 FR 1301149 A FR1301149 A FR 1301149A FR 1301149 A FR1301149 A FR 1301149A FR 3005705 A1 FR3005705 A1 FR 3005705A1
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France
Prior art keywords
screw
bolt
washer
fiber
wall
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Granted
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FR1301149A
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French (fr)
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FR3005705B1 (en
Inventor
Salvatore Fidaleo
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Priority to FR1301149A priority Critical patent/FR3005705B1/en
Publication of FR3005705A1 publication Critical patent/FR3005705A1/en
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Publication of FR3005705B1 publication Critical patent/FR3005705B1/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/061Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve of the buckling type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/14Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
    • F16B13/141Fixing plugs in holes by the use of settable material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/04Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/06Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
    • F16B37/062Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting
    • F16B37/065Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the nut
    • F16B37/067Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the nut the material of the nut being deformed by a threaded member generating axial movement of the threaded part of the nut, e.g. blind rivet type

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

Dispositif de fixation permettant de boulonner avec une vis sur une paroi dont l'autre côté n'est pas accessible ayant pour prérogatives supplémentaires de créer dans le même temps une étanchéité eau et pression, une coupe thermique et un suppresseur d'effet d'électrolyse. Il comporte une vis provisoire (1) plus longue que la vis qui sera fixée définitivement, une grosse rondelle (2), 2 boulons (3 et 4), de la fibre de verre (5), de la résine, de la cire de démoulage, et un fil de coton (6). Lors du serrage (fig.2), la fibre de verre (5) liée de part et d'autre du boulon (4) se gonfle entre ledit boulon et la paroi créant ainsi un double oméga que nous nommerons rondelle en fibre de verre (8), permettant de créer une étanchéité eau et pression. Selon une deuxième caractéristique, l'utilisation couplée d'une fibre (de verre, de carbone, etc...) et d'une résine (polyester, époxy, polyuréthane, et autres résines déjà disponibles ou à venir) compatible avec le support, le dispositif crée une coupe thermique ainsi que l'annulation de l'effet d'électrolyse. Ce dispositif peut s'adapter à n'importe quel type d'utilisation (bricolage, accastillage de marine etc...).Fastening device for bolting with a screw on a wall whose other side is not accessible having the additional prerogatives of creating at the same time a seal water and pressure, a thermal cut and an electrolysis effect suppressor . It includes a temporary screw (1) longer than the screw that will be fixed permanently, a large washer (2), 2 bolts (3 and 4), fiberglass (5), resin, wax demolding, and a cotton thread (6). When tightening (fig.2), the fiberglass (5) bonded on either side of the bolt (4) swells between said bolt and the wall thus creating a double omega we will call fiberglass washer ( 8), to create water and pressure tightness. According to a second characteristic, the coupled use of a fiber (glass, carbon, etc.) and a resin (polyester, epoxy, polyurethane, and other resins already available or to come) compatible with the support , the device creates a thermal cut and the cancellation of the electrolysis effect. This device can adapt to any type of use (DIY, marine hardware etc ...).

Description

La présente invention concerne un dispositif pour boulonner avec une vis, sur une superficie dont l'autre côté ne nous est pas accessible, et ce, quel que soit le support, le matériau, ou encore l'espace disponible de l'autre côté. Ce dispositif peut également être choisi en remplacement d'un système traditionnel pour ses prérogatives de solidité, d'étanchéité eau et/ou pression, de coupe thermique, et de suppresseur d'effet d'électrolyse, même dans le cas d'un support dont l'autre côté nous est accessible. Il existe d'autres techniques qui permettent d'obtenir un résultat subsidiaire telles que les chevilles en aluminium et PVC qui s'écartent dans le support mais qui n'atteignent pas la solidité d'un système vis + rondelle + écrou, et qui d'autre part ne suppriment pas un effet d'électrolyse selon le matériau utilisé (ex : aluminium + inox). D'autres systèmes encore permettent de boulonner une vis sur une superficie dont l'autre côté ne nous est pas accessible, tels que le système vis + rondelle pivotante, ou encore un kit utilisant de la résine, mais à chaque fois, ces dispositifs montrent des limites, soit de solidité, soit d'étanchéité, soit encore d'adaptabilité selon le support, le type d'utilisation, ou d'espace requis.The present invention relates to a device for bolting with a screw, on an area whose other side is not accessible to us, and this, whatever the support, the material, or the space available on the other side. This device can also be chosen to replace a traditional system for its prerogatives of strength, sealing water and / or pressure, thermal cutting, and suppressor electrolysis effect, even in the case of a support whose other side is accessible to us. There are other techniques that allow to obtain a subsidiary result such as aluminum and PVC dowels which deviate in the support but do not reach the strength of a system screw + washer + nut, and which d on the other hand do not suppress an electrolysis effect according to the material used (eg aluminum + stainless steel). Still other systems make it possible to bolt a screw on an area whose other side is not accessible to us, such as the screw system + pivoting washer, or a kit using resin, but each time these devices show limits, either of strength or sealing, or of adaptability depending on the support, the type of use, or space required.

Le dispositif selon l'invention permet de remédier à tous ces inconvénients. Il comporte une vis provisoire (1) plus longue que la vis qui sera fixée définitivement, une grosse rondelle (2), 2 boulons (3 et 4), de la fibre de verre (5), de la cire de démoulage, et un fil de coton (6). Selon une première caractéristique, lors du serrage (fig.2), la fibre de verre (5) liée de part et d'autre du boulon (4) se gonfle entre ledit boulon et la paroi créant ainsi un double oméga que nous nommerons rondelle en fibre de verre (8) capable d'épouser les aspérités ainsi que les irrégularités éventuelles de la paroi côté obscur, ce qui lui confère une adaptabilité sans pareille ainsi qu'une étanchéité eau et pression. Selon une deuxième caractéristique, l'utilisation couplée d'une fibre (de verre, de carbone, etc...) et d'une résine (polyester, époxy, polyuréthane, et autres résines déjà disponibles ou à venir) compatible avec le support, le dispositif crée une coupe thermique ainsi que l'annulation de l'effet d'électrolyse.The device according to the invention overcomes all these disadvantages. It includes a temporary screw (1) longer than the screw that will be fixed permanently, a large washer (2), 2 bolts (3 and 4), fiberglass (5), mold release wax, and a cotton thread (6). According to a first characteristic, during tightening (FIG. 2), the glass fiber (5) bonded on either side of the bolt (4) swells between said bolt and the wall thus creating a double omega which we will call a washer fiberglass (8) capable of marrying asperities as well as any irregularities of the dark side wall, which gives it unparalleled adaptability and water and pressure tightness. According to a second characteristic, the coupled use of a fiber (glass, carbon, etc.) and a resin (polyester, epoxy, polyurethane, and other resins already available or to come) compatible with the support , the device creates a thermal cut and the cancellation of the electrolysis effect.

Ce dispositif peut s'adapter à n'importe quel type d'utilisation comme par exemple dans le domaine de l'accastillage de marine. Il permet de remplacer un rail de fargues ou une rambarde sans avoir à démonter l'intérieur du bateau. Ce dispositif s'applique également à la pose d'un robinet sur un réservoir contenant du liquide (liquide alimentaire, carburant etc...) en utilisant une résine compatible avec le contenu du réservoir.This device can adapt to any type of use as for example in the field of marine fittings. It allows to replace a rail fargues or a rail without having to disassemble the interior of the boat. This device also applies to the installation of a valve on a tank containing liquid (liquid food, fuel etc ...) using a resin compatible with the contents of the tank.

Les dessins annexés illustrent l'invention : La figure 1 représente en coupe la première étape de réalisation, la figure 2 représente en coupe l'étape du serrage, puis la figure 3 représente en coupe ce qu'il reste dans la paroi avant insertion de la vis définitive. En référence à ces dessins, voici le détail, étape par étape du mode d'utilisation de l'invention : Nous utilisons une vis provisoire (1) plus longue que la vis qui sera fixée définitivement, une grosse rondelle (2), 2 boulons (3 et 4), de la fibre de verre (5), de la cire de démoulage, et un fil de coton (6). Dans un premier temps, nous appliquons de la cire de démoulage sur la vis provisoire (1), la rondelle (2), ainsi que sur 1 boulon provisoire (3) afin que la fibre de verre ne s'y accroche pas. Nous vissons complètement le boulon provisoire (3) sur la vis provisoire (1), puis nous enfilons la rondelle (2).The accompanying drawings illustrate the invention: FIG. 1 is a sectional representation of the first embodiment step, FIG. 2 is a sectional view of the clamping step, and FIG. 3 is a sectional view of what remains in the wall before insertion of FIG. the definitive screw. With reference to these drawings, here is the detail, step by step of the method of use of the invention: We use a temporary screw (1) longer than the screw that will be permanently fixed, a large washer (2), 2 bolts (3 and 4), fiberglass (5), demolding wax, and a cotton thread (6). Firstly, we apply demolding wax on the temporary screw (1), the washer (2), as well as on 1 provisional bolt (3) so that the fiberglass does not stick to it. We screw completely the temporary bolt (3) on the temporary screw (1), then we thread the washer (2).

Nous vissons le boulon non traité avec la cire de démoulage (4) sur l'opposé de la vis (1), puis nous entourons cette vis (1) ainsi que le boulon non traité (4) de fibre de verre (5) jusqu'à la rondelle (2) non incluse. Nous attachons avec un fil de coton (6) la fibre de verre (5) autour du boulon non traité (4). Nous appliquons de la résine (polyester, époxy, polyuréthane etc...) compatible avec le matériau de la paroi (7) sur laquelle nous fixons la vis (1), sur la fibre de verre (5). Nous faisons un trou dans la paroi (7) plus large que la vis (1) entourée de fibre de verre, mais plus petit que la rondelle (2). A ce stade, nous insérons notre montage (fig.1) dans la paroi (7). Nous vissons (fig.2) le boulon provisoire (3) en maintenant la vis (1) immobile. La vis (1) commence alors à sortir en ramenant le boulon (4) positionné à l'intérieur, vers la paroi (7). En se déplaçant, le boulon (4) maintenu par le fil de coton (6), fait gonfler la fibre de verre (5), créant un double oméga que nous nommerons rondelle de fibre de verre (8). Nous laissons sécher le dispositif le temps qu'il convient selon la résine utilisée. Lorsque c'est sec (fig.3), nous dévissons la vis provisoire (1) et enlevons la rondelle (2) et le boulon provisoire (3), laissant de l'autre côté de la paroi (7), une rondelle de fibre de verre (8), ainsi que le boulon (4) prêt à recevoir la vis définitive. Nous vissons alors la vis que nous souhaitons utiliser.We screw the untreated bolt with the release wax (4) on the opposite side of the screw (1), then we surround this screw (1) as well as the untreated bolt (4) of fiberglass (5) until 'to the washer (2) not included. We attach the fiberglass (5) with a cotton thread (6) around the untreated bolt (4). We apply resin (polyester, epoxy, polyurethane etc ...) compatible with the material of the wall (7) on which we fix the screw (1) on the fiberglass (5). We make a hole in the wall (7) wider than the screw (1) surrounded by fiberglass, but smaller than the washer (2). At this point, we insert our assembly (fig.1) in the wall (7). We screw (fig.2) the temporary bolt (3) keeping the screw (1) stationary. The screw (1) then starts out by bringing the bolt (4) positioned inside, towards the wall (7). By moving, the bolt (4) held by the cotton thread (6), swells the fiberglass (5), creating a double omega we will call fiberglass washer (8). We let the device dry as long as it suits the resin used. When it is dry (fig.3), we unscrew the provisional screw (1) and remove the washer (2) and the provisional bolt (3), leaving on the other side of the wall (7), a washer of fiberglass (8), as well as the bolt (4) ready to receive the final screw. We then screw the screw we want to use.

Dans le'cas d'une application industrielle, nous envisageons de remplacer la vis provisoire (1) par une tige filetée fabriquée dans une matière résistante aux solvants de manière à ce que la résine utilisée ne s'y accroche pas. Nous utiliserions une rondelle fabriquée dans la même matière en substitution de la rondelle (2). Celle-ci serait perforée en une forme étoilée dont les branches s'écartent et s'accrochent au filetage lors du passage de la vis provisoire (1) ne permettant pas un retour en arrière. Le dispositif serait alors appliqué avec un outil semblable à une riveteuse.In the case of an industrial application, we plan to replace the temporary screw (1) with a threaded rod made of a solvent-resistant material so that the resin used does not stick to it. We would use a washer made of the same material to replace the washer (2). It would be perforated into a star shape whose branches deviate and cling to the thread during the passage of the temporary screw (1) does not allow a return back. The device would then be applied with a tool similar to a riveter.

Claims (3)

REVENDICATIONS1) Dispositif de fixation d'un boulon à une paroi dont l'autre côté n'est pas accessible caractérisé en ce qu'il comporte une vis provisoire (1) plus longue que la vis qui sera fixée définitivement, une grosse rondelle (2), 2 boulons (3 et 4), de la fibre (5), un lien (6) caractérisé en ce que , lors du serrage, la fibre (5) liée de part et d'autre du boulon (4) se gonfle entre ledit boulon et la paroi créant ainsi un double oméga permettant la fixation du boulon (4) à la paroi.CLAIMS1) Device for fixing a bolt to a wall whose other side is not accessible characterized in that it comprises a temporary screw (1) longer than the screw which will be permanently fixed, a large washer (2 ), 2 bolts (3 and 4), of the fiber (5), a link (6) characterized in that, during tightening, the fiber (5) bonded on either side of the bolt (4) inflates between said bolt and the wall thus creating a double omega for fixing the bolt (4) to the wall. 2) Dispositif selon la revendication 1 qui comporte en outre de la cire de démoulage empêchant la résine utilisée de s'accrocher à la vis provisoire (1), à la grosse rondelle (2) ainsi qu'au boulon provisoire (3).2) Device according to claim 1 which further comprises release wax preventing the resin used to hook on the temporary screw (1), the big washer (2) and the temporary bolt (3). 3) Procédé de fixation d'un dispositif de fixation d'un boulon à une paroi dont l'autre côté n'est pas accessible caractérisé en ce qu'il comporte les étapes consistant à : a) On applique de la cire de démoulage sur la vis provisoire (1), la rondelle (2), ainsi que sur 1 boulon provisoire (3) afin que la résine ne s'y accroche pas. b) On visse complètement le boulon provisoire (3) sur la vis provisoire (1), puis on enfile la rondelle (2). c) On visse le boulon non traité avec la cire de démoulage (4) sur l'opposé de la vis (1), puis on entoure cette vis (1) ainsi que le boulon non traité (4) de fibre (5) jusqu'à la rondelle (2) non incluse. d) On attache avec le lien (6), la fibre (5) autour du boulon non traité (4). e) On applique de la résine compatible avec la fibre utilisée ainsi qu'avec le matériau support (7), sur la fibre (5). f) On fait un trou dans la paroi (7) plus large que la vis (1) entourée de fibre, mais plus petit que la rondelle (2). g) On insère notre montage (fig.1) dans la paroi (7). h) On visse (fig.2) le boulon provisoire (3) en maintenant la vis (1) immobile. La vis (1) commence alors à sortir en ramenant le boulon (4) positionné à l'intérieur, vers la paroi (7). i) En se déplaçant, le boulon (4) maintenu par le lien (6), fait gonfler la fibre (5), créant un double oméga que nous nommerons rondelle de fibre (8). j) On laisse sécher le dispositif le temps qu'il convient selon la résine utilisée. k) Lorsque c'est sec (fig.3), on dévisse la vis provisoire (1) et on enlève la rondelle (2) et le boulon provisoire (3), laissant de l'autre côté de la paroi (7), une rondelle de fibre (8), ainsi que le boulon (4) prêt à recevoir la vis définitive. i) On insère alors la vis que l'on souhaite utiliser.353) Method for fixing a device for fixing a bolt to a wall whose other side is not accessible characterized in that it comprises the steps of: a) Apply mold release wax on the provisional screw (1), the washer (2), as well as on 1 temporary bolt (3) so that the resin does not stick to it. b) Completely screw the temporary bolt (3) onto the temporary screw (1), then insert the washer (2). c) Screw the untreated bolt with the demolding wax (4) on the opposite side of the screw (1), then surround the screw (1) and the untreated bolt (4) of fiber (5) until 'to the washer (2) not included. d) The fiber (5) is tied with the link (6) around the untreated bolt (4). e) Resin compatible with the fiber used and with the support material (7) is applied to the fiber (5). f) A hole is made in the wall (7) wider than the screw (1) surrounded by fiber, but smaller than the washer (2). g) We insert our assembly (fig.1) into the wall (7). h) Screw (fig.2) the temporary bolt (3) keeping the screw (1) stationary. The screw (1) then starts out by bringing the bolt (4) positioned inside, towards the wall (7). i) By moving, the bolt (4) held by the link (6), inflates the fiber (5), creating a double omega we will call fiber washer (8). j) The device is allowed to dry as long as is appropriate depending on the resin used. k) When dry (fig.3), unscrew the provisional screw (1) and remove the washer (2) and the provisional bolt (3), leaving on the other side of the wall (7), a fiber washer (8), as well as the bolt (4) ready to receive the final screw. i) Insert the screw you want to use.
FR1301149A 2013-05-15 2013-05-15 DEVICE FOR FIXING A BOLT TO A WALL WHOSE OTHER SIDE IS NOT ACCESSIBLE Expired - Fee Related FR3005705B1 (en)

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FR1301149A FR3005705B1 (en) 2013-05-15 2013-05-15 DEVICE FOR FIXING A BOLT TO A WALL WHOSE OTHER SIDE IS NOT ACCESSIBLE

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FR1301149A FR3005705B1 (en) 2013-05-15 2013-05-15 DEVICE FOR FIXING A BOLT TO A WALL WHOSE OTHER SIDE IS NOT ACCESSIBLE

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3071566A1 (en) * 2017-09-25 2019-03-29 Salvatore Fidaleo COMPOSITE THREAD INSERT
EP3599384A1 (en) * 2018-07-26 2020-01-29 Hilti Aktiengesellschaft Method for optically rating a screw

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394189A2 (en) * 1989-04-17 1990-10-24 HILTI Aktiengesellschaft Anchoring in plate shaped element
JPH04254011A (en) * 1991-02-05 1992-09-09 Nippon Ekusu Kuron Kk Joining method for member
EP1277970A1 (en) * 2001-06-29 2003-01-22 Wakai & Co., Ltd. Anchor for boards and method for manufacturing the same
FR2903742A1 (en) * 2006-07-12 2008-01-18 Prospection & Inventions CHEMICAL, CHEMICAL ENVELOPE COMPRESSABLE TO POLYMERIZABLE PRODUCTS INCLUDING AT LEAST ONE INSERT.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394189A2 (en) * 1989-04-17 1990-10-24 HILTI Aktiengesellschaft Anchoring in plate shaped element
JPH04254011A (en) * 1991-02-05 1992-09-09 Nippon Ekusu Kuron Kk Joining method for member
EP1277970A1 (en) * 2001-06-29 2003-01-22 Wakai & Co., Ltd. Anchor for boards and method for manufacturing the same
FR2903742A1 (en) * 2006-07-12 2008-01-18 Prospection & Inventions CHEMICAL, CHEMICAL ENVELOPE COMPRESSABLE TO POLYMERIZABLE PRODUCTS INCLUDING AT LEAST ONE INSERT.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3071566A1 (en) * 2017-09-25 2019-03-29 Salvatore Fidaleo COMPOSITE THREAD INSERT
EP3599384A1 (en) * 2018-07-26 2020-01-29 Hilti Aktiengesellschaft Method for optically rating a screw
WO2020020688A1 (en) * 2018-07-26 2020-01-30 Hilti Aktiengesellschaft Method for optically rating a fastener arrangement including a screw

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