EP3292958B1 - Method for extracting safety screws and extractor for implementation of the method - Google Patents

Method for extracting safety screws and extractor for implementation of the method Download PDF

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Publication number
EP3292958B1
EP3292958B1 EP16315008.9A EP16315008A EP3292958B1 EP 3292958 B1 EP3292958 B1 EP 3292958B1 EP 16315008 A EP16315008 A EP 16315008A EP 3292958 B1 EP3292958 B1 EP 3292958B1
Authority
EP
European Patent Office
Prior art keywords
extractor
screw
head
rod
drill
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.)
Active
Application number
EP16315008.9A
Other languages
German (de)
French (fr)
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EP3292958A1 (en
Inventor
Yannick Dudot
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.)
Hubitools SA
Original Assignee
Hubitools SA
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
Priority to EP16315008.9A priority Critical patent/EP3292958B1/en
Application filed by Hubitools SA filed Critical Hubitools SA
Priority to DE16315008.9T priority patent/DE16315008T1/en
Priority to DK16315008.9T priority patent/DK3292958T3/en
Priority to ES16315008T priority patent/ES2774470T3/en
Priority to BE20175246A priority patent/BE1024703B1/en
Priority to FR1770354A priority patent/FR3055823B3/en
Priority to US15/699,608 priority patent/US10478952B2/en
Priority to TW106130846A priority patent/TWI746632B/en
Publication of EP3292958A1 publication Critical patent/EP3292958A1/en
Application granted granted Critical
Publication of EP3292958B1 publication Critical patent/EP3292958B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/105—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit
    • B25B23/108—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit the driving bit being a Philips type bit, an Allen type bit or a socket

Definitions

  • the invention lies in the field of processes and tooling for automobile mechanics and concerns in particular the methods and tools for dismounting vehicle wheels, for example motor vehicles.
  • This specific tool is usually present in the vehicle. However, it may happen that this tool is lost or damaged preventing the user of the vehicle to change his wheel in case of puncture. The user must then call a professional mechanic who will either have the appropriate tool, or will have to find a solution to remove the security screw. It may also happen that the specific imprint shown by the screw head is damaged and therefore unusable, or that the tool has broken on the screw head and remains partly fixed on the latter so that the specific imprint is no longer accessible.
  • the object of the invention is to meet at least one of the disadvantages presented by the prior art by proposing a method and tools for disassembling vehicle wheels that have a universal character in that they are likely to be used. on safety screws of different models or which are broken.
  • step (b) of fitting comprises the use of a striking mandrel disposed between the extractor and the percussion tool and one end of which has a shape imprint conjugated to that of the head of the extractor.
  • the invention consists in substituting the security screw head or broken, the head of an extractor that can be manipulated by standard tools. To do this, the invention will couple in rotation the extractor with the screw to be loosened by forcing it into a bore in said screw.
  • the presence of the head and possibly a sleeve on the extractor forming a shoulder limits the depression of the extractor in the screw by abutment of the head of the screw on the head of the extractor or on the shoulder formed by the sleeve. This limitation of the depression of the rod of the extractor makes it possible to confine the rod of the extractor inside the screw and not to risk coming to hook the hub of the wheel while allowing the fitting of a rod of significant length in said screw.
  • the use of a typing mandrel makes it possible to hold the extractor in position for its fitting.
  • the tool set may also include an extraction mandrel for unhooking the extractor of the screw into which it is fitted.
  • the extractor comprises a sleeve disposed at the base of the head, the sleeve having a diameter greater than that of the stem and less than that of the head so as to form a shoulder with the rod.
  • the head of the extractor is hexagonal. More preferably, the extractor is steel.
  • the extractor according to the invention is remarkable in that it makes it possible to have a straight fitting having a large contact surface with the screw to be loosened, making it possible to apply a loosening torque of up to 160 Nm or more for loosening the screw.
  • the fitting of the extractor until the abutment of the head or the shoulder presented by the sleeve makes it possible firstly to be able to control the length of insertion of the rod and to constrain it not to exceed of the screw rod.
  • the abutment avoids the beats during the manipulation of the extractor which would affect its retention in the screw, the head or the sleeve being placed in abutment against the screw.
  • the invention relates to the use of an assembly as defined above for the extraction of a safety screw or a broken screw on a vehicle wheel.
  • understand is synonymous with “include” and is not limiting in that it allows the presence of other elements in the device or the vehicle to which it refers. It is understood that the term “understand” includes the words “consist of”.
  • the extractor 1 used for the implementation of the method of extracting a screw such as a safety screw or a broken screw.
  • the extractor 1 according to the invention comprises a toothed rod 3 whose teeth, in the form of protruding ribs, extend longitudinally along the length of the rod 3, so that a cross section of the rod shows a configuration of star.
  • the extractor 1 also has a head 7 which is preferably hexagonal in shape so that it can be handled by the standard keys.
  • the extractor 1 is advantageously made of steel.
  • the head 7 and the rod 3 are fixed to each other irreversibly so that during the insertion of the rod 3 into the screw the head can serve as a stop to limit the depression of the extractor and support to avoid beatings during manipulations as we will see later.
  • the extractor 1 comprises a sleeve 9 disposed at the base of the head 7 and having a diameter greater than that of the rod 3 and less than that of the head 7 so as to form a shoulder 11 with the rod 3.
  • the method according to the invention comprises the steps according to claim 1.
  • the step a) of drilling a bore is represented on the figure 2 in the context of the extraction of a security screw 13 called "reentrant" in that it is disposed at the bottom of a cavity presented by the rim 15 of the wheel.
  • This step therefore comprises drilling a bore 17 in the screw 13 to be loosened in the longitudinal direction thereof by means of a drill 19 of diameter less than the diameter of the rod 21 of the screw 13.
  • the security screw is shown with a round head 23. The drilling operation is in progress so that the bore has not yet reached the screw shank. Nevertheless, in the process according to the invention, the screw shank is hollowed along all or part of its length.
  • the length of the bore made in the screw is greater than 10 mm for example between 10 and 20 mm depending on the screw models considered.
  • This length of the bore will allow to receive an extractor whose rod has a corresponding length and which therefore provides a large contact surface. This large contact surface will allow the application of sufficient torque for the loosening of the screw.
  • the drilling is carried out by means of a drill 19.
  • the step (a) of drilling the bore is done by means of a drill comprising a tungsten carbide tip.
  • a drill comprising a tungsten carbide tip.
  • Such a drill can for example be obtained by slitting the tip of a traditional steel drill bit to insert a tungsten carbide insert. The use of such a drill makes it easier to drill safety screws when they are made of a hardened steel.
  • the diameter of the drill is equal to the diameter of the rod of the extractor so that the rod of the extractor can be engaged and be retained in the bore dug in the screw. It will be understood that the bore 17 must be central relative to the head 23 of the screw since it then extends into the rod 21 of this screw. Also according to a preferred embodiment of the invention, and as represented on the figure 2 , the step (a) of drilling the bore is performed using a centralizer 25 for positioning and guiding the drill.
  • this centraliser can come in different forms.
  • the screw is a so-called "re-entrant” screw because it is positioned at the bottom of a cavity presented by the rim
  • the "reentrant screw” centralizer 25 will advantageously be in the form of a truncated cone pierced by a central duct on crossing on both sides in its longitudinal direction.
  • Such a centraliser is represented in figure 3 .
  • the led 27 has a diameter greater than that of the drill and has the function of positioning and guiding this drill.
  • the figure 4 presents another embodiment of a centralizer 29 according to the invention for centering and guiding the drill in the case of so-called "outgoing" screws, in that they are in relief on the rim.
  • the centralizer 29 "with outgoing screws” will then be in the form of a hollow socket, of cylindrical or frustoconical body 31, and traversed by a central duct 35 in communication with an internal cavity 33 opening on one of the ends of the body 31.
  • the inner cavity 33 has an inner conical shape so that its diameter decreases along its length from its mouth. This configuration will allow the centraliser to cap the screw head and be retained on the latter.
  • the central duct 35 of diameter greater than that of the drill shaft (and therefore of the extractor rod) is used for positioning and guiding said drill bit.
  • the centralizer 29 has at the end opposite to that opening on the inner cavity 33 a protrusion 37 reproducing the shape of the head of the extractor, said protuberance 37 being traversed by said duct 35.
  • This protuberance 37 allows the user to use a chuck to come to position and drive the centralizer 29 on the head of the screw.
  • This impression centering device is in the form of a cylindrical body socket 41, and having on at least one of its ends an impression 43 of shape conjugated to a hexagonal screw head.
  • the body 41 has a central duct 45 passing therethrough on both sides in its longitudinal direction.
  • the conduit 45 has a diameter greater than that of the drill rod (and therefore the rod of the extractor) and is used for positioning and guiding the drill.
  • the impression 43 will hold the head in position and prevent it from rotating under the action of the drill during the drilling operation.
  • the body 31 has two diametrically opposite plates 47 to facilitate gripping and retention in position of the centraliser. More preferably, the centraliser has a fingerprint conjugated to a hexagonal screw head at each of its ends, said fingerprints having different dimensions.
  • At least one of the centralizers is made of plastic material, for example polyoxymethylene (POM) to limit the risk of damaging the paint and varnish rims. Nevertheless, it is also possible to produce them in metallic materials.
  • plastic material for example polyoxymethylene (POM)
  • the extractor according to the invention can be put in place.
  • the rod of the extractor is force-fitted into said bore during a step b) of fitting shown in FIG. figure 6 .
  • the fitting is made by longitudinal sliding along the bore and this sliding is generated by percussion on the head of the extractor by means of a percussion tool, for example a hammer.
  • the fitting of the extractor into the screw will couple in rotation the extractor and the screw.
  • the step (b) of fitting is carried out by placing a striking mandrel 51 between the extractor 1 and the hammer 49.
  • the striking mandrel 51 according to the invention comprises an end having a footprint 53 of shape conjugated to that of the head 7 of the extractor 1. The use of such a mandrel keeps the extractor in position for its fitting.
  • the extractor 1 is fitted until the base of its head comes into abutment against the head 27 of the screw, or when the extractor has a sleeve 9 against the shoulder 11 formed by the sleeve 9 with the 3.
  • This limitation of the depression of the extractor 1 ensures that the rod 3 thereof remains in the rod 21 of the screw 13. In fact, if the rod of the extractor exceeded the end of the screw shank, it would cling to the hub of the wheel which would make the loosening of the screw more difficult.
  • step c) extraction (not shown) by means of a key cooperating with the head of the extractor .
  • the straight character of the fitting associated with the extended contact surface makes it possible to obtain a loosening torque of at least 160 Nm, necessary for the loosening of the safety screws of the vehicle wheels.
  • the step (c) of extracting the screw is followed by a step (d) of unhooking the extractor of the screw into which it has been fitted, preferably by use of a stall chuck 55 as shown in FIG. figure 7 .
  • the separation of the screw 13 and the extractor 1 allows to reuse said extractor 1 for the extraction of another screw 13.
  • the stall operation can be performed when the extractors 1 have a sleeve 9 defining a space between the head 23 of the screw 13 and the head 7 of the extractor 1.
  • the stalling mandrel 55 has at one of its ends a fork 57 comprising two parallel teeth 59 of increasing thickness between their point 61 and their base 63.
  • the spacing between the teeth 59 of the stalling mandrel 55 is chosen to be greater than the diameter of the sleeve 9 and less than the diameter of the head 7 of the extractor. In the case where the stall chuck is used with an extractor having no sleeve, the spacing between the teeth of the stall chuck must be greater than the diameter of the rod of said extractor.
  • Step d) is illustrated on the figure 8 .
  • the screw 13 is held by the jaws 65 of a vise.
  • the stalling mandrel 55 is positioned to place the sleeve of the extractor 1 between its teeth 59.
  • the sleeve is then pressed between the teeth 59 of the fork by percussion.
  • the teeth 59 having an increasing height which at the base of said teeth is greater than the height of the sleeve, the depression of the extractor 1 will lift said extractor 1 to partially out of the screw 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Description

L'invention se situe dans le domaine des procédés et de l'outillage pour la mécanique automobile et concerne en particulier les procédés et outils pour le démontage de roues de véhicule, par exemple de véhicule automobile.The invention lies in the field of processes and tooling for automobile mechanics and concerns in particular the methods and tools for dismounting vehicle wheels, for example motor vehicles.

Il est connu de fixer la roue d'un véhicule sur son moyeu par le biais d'une pluralité de vis dont l'une d'elles est une vis de sécurité ou antivol. Ces vis de sécurité, également nommées « vis inviolables » peuvent se présenter sous plusieurs formes. Il est ainsi connu des vis de sécurité dont la tête a une forme particulière qui ne correspond pas aux empreintes de clés standards de sorte qu'il est nécessaire d'utiliser un outil spécifique comprenant une clé de forme conjuguée à la tête de la vis de sécurité afin de pouvoir en permettre le desserrage.It is known to fix the wheel of a vehicle on its hub through a plurality of screws, one of which is a security screw or antitheft. These security screws, also called "tamperproof screws" can come in many forms. It is thus known safety screws whose head has a particular shape that does not correspond to the standard key impressions so that it is necessary to use a specific tool comprising a shape key conjugate to the head of the screw of safety in order to allow loosening.

Cet outil spécifique est généralement présent dans le véhicule. Cependant, il peut advenir que cet outil soit perdu ou abîmé empêchant l'utilisateur du véhicule de changer sa roue en cas de crevaison. L'utilisateur doit alors faire appel à un mécanicien professionnel qui va soit posséder l'outil adéquat, soit va devoir trouver une solution pour retirer cette vis de sécurité. Il peut également arriver que l'empreinte spécifique montrée par la tête de vis soit abîmée et donc inutilisable, ou encore que l'outil se soit cassé sur la tête de vis et reste en partie fixé sur cette dernière si bien que l'empreinte spécifique n'est plus accessible.This specific tool is usually present in the vehicle. However, it may happen that this tool is lost or damaged preventing the user of the vehicle to change his wheel in case of puncture. The user must then call a professional mechanic who will either have the appropriate tool, or will have to find a solution to remove the security screw. It may also happen that the specific imprint shown by the screw head is damaged and therefore unusable, or that the tool has broken on the screw head and remains partly fixed on the latter so that the specific imprint is no longer accessible.

Une des solutions mise en œuvre par les mécaniciens pour néanmoins desserrer la vis, et donc changer la roue, est de souder sur la tête de la vis de sécurité une autre vis à tête hexagonale (standardisée) afin de la coupler en rotation avec ladite vis. L'ensemble ainsi formé présente alors une tête pouvant être manipulée avec des outils standards pour le desserrage de la vis de sécurité.One of the solutions implemented by the mechanics to nevertheless loosen the screw, and therefore change the wheel, is to weld on the head of the safety screw another hexagon screw (standardized) to couple it in rotation with said screw . The assembly thus formed then has a head that can be handled with standard tools for loosening the safety screw.

Malheureusement, cette technique présente des inconvénients parmi lesquels on peut citer un endommagement par la chaleur des peintures et vernis des jantes ou le risque de casser la tête de la vis de sécurité si cette dernière présente une tête fusible.Unfortunately, this technique has drawbacks among which may be mentioned damage by heat paint and varnish rims or the risk of breaking the head of the safety screw if the latter has a fuse head.

Enfin cette technique est inadaptée aux cas où la tête de la vis de sécurité est conçue pour tourner librement (tête folle) en l'absence d'un outil comprenant les moyens de prise adéquats de ladite tête comme dans l'exemple de dispositif de sécurité décrit par le document EP2228176 .Finally, this technique is unsuited to cases where the head of the safety screw is designed to rotate freely (idle head) in the absence of a tool comprising the appropriate gripping means of said head as in the example of safety device described by the document EP2228176 .

Il existe des procédés et outils pour l'extraction de vis cassées tels que décrit par exemple dans le document EP0451256 ou le document US2006/0191379 . De tels extracteurs se présentent sous forme d'une tige filetée avec un filetage inversé à gauche et généralement de forme conique. Ils sont insérés dans un forage effectué dans la vis en vue de l'extraction de celle-ci. Malheureusement, ces solutions sont peu adaptées au démontage de vis de sécurité et en particulier des vis de sécurité utilisées sur les roues des véhicules en raison de la fragilité de leur filetage ou de leur surface de contact insuffisante qui ne permet pas d'appliquer un couple suffisant pour desserrer lesdites vis. En effet, les vis de sécurité sur les roues des véhicules peuvent présenter un couple de serrage de 160 N.m ou plus.There are methods and tools for extracting broken screws as described for example in the document EP0451256 or the document US2006 / 0191379 . Such extractors present in the form of a threaded rod with an inverted thread on the left and generally of conical shape. They are inserted into a hole made in the screw for the purpose of extracting it. Unfortunately, these solutions are not suitable for disassembly of safety screws and in particular safety screws used on the wheels of vehicles because of the fragility of their thread or their insufficient contact surface that does not allow to apply a torque sufficient to loosen said screws. Indeed, the safety screws on the wheels of the vehicles may have a tightening torque of 160 Nm or more.

D'autres outils sont décrits dans les documents US6098499 , DE102012104298 et US1798944 . Cependant, ces outils ne sont également pas adaptés au démontage de vis de sécurité et en particulier des vis de sécurité utilisées sur les roues des véhicules en raison de la fragilité de leur filetage ou de leur surface de contact insuffisante qui ne permet pas d'appliquer un couple suffisant pour desserrer lesdites vis. En effet, les vis de sécurité sur les roues des véhicules peuvent présenter un couple de serrage de 160 N.m ou plus.Other tools are described in the documents US6098499 , DE102012104298 and US1798944 . However, these tools are also not suitable for disassembling safety screws and in particular safety screws used on the wheels of vehicles because of the fragility of their thread or their insufficient contact surface that does not allow to apply a sufficient torque to loosen said screws. Indeed, the safety screws on the wheels of the vehicles may have a tightening torque of 160 Nm or more.

L'outil décrit dans le document US6098499 risque, lors de son utilisation, de dévier de sa position, au risque d'abîmer la vis cassée ainsi que les éléments l'environnant.The tool described in the document US6098499 risk, during its use, to deviate from its position, at the risk of damaging the broken screw and the surrounding elements.

Il existe donc un besoin d'un procédé et d'outils pour l'extraction de vis de sécurité qui soient adaptables à différentes sortes de vis de sécurité et qui soient également utilisables dans les cas où la vis est cassée ou endommagée ou lorsque la tête de vis est fusible ou conçue pour tourner librement. Il existe également un besoin pour un procédé d'extraction et pour des outils qui permettent d'extraire une vis de sécurité cassée dont la mise en œuvre ne risque pas d'abîmer les éléments environnant ladite vis. Il existe un besoin de procédé et d'outils pour l'extraction de vis de sécurité qui soient adaptés au démontage de roues de véhicule et qui soient donc aptes à pouvoir être utilisé en relation avec des vis dont le couple de serrage est élevé.There is therefore a need for a method and tools for extracting security screws that are adaptable to different kinds of security screws and that can also be used in cases where the screw is broken or damaged or when the head screw is fusible or designed to rotate freely. There is also a need for an extraction process and for tools that make it possible to extract a broken security screw whose implementation is not likely to damage the elements surrounding said screw. There is a need for a method and tools for extracting safety screws that are suitable for disassembling vehicle wheels and that are therefore capable of being used in connection with screws having a high tightening torque.

L'invention a pour objectif de répondre à au moins un des inconvénients présentés par l'art antérieur en proposant un procédé et des outils pour le démontage de roues de véhicule qui aient un caractère universel en ce qu'ils sont susceptibles d'être utilisés sur des vis de sécurité de modèles différents ou qui sont cassées.The object of the invention is to meet at least one of the disadvantages presented by the prior art by proposing a method and tools for disassembling vehicle wheels that have a universal character in that they are likely to be used. on safety screws of different models or which are broken.

A cet effet, et selon un premier aspect, l'invention a pour objet un procédé d'extraction d'une vis de sécurité ou d'une vis cassée, ladite vis comprenant une tige, le procédé étant remarquable en ce qu'il comprend les étapes suivantes :

  1. a) perçage d'un alésage dans la vis selon la direction longitudinale de celle-ci au moyen d'un foret de diamètre inférieur au diamètre de la tige de la vis ;
  2. b) emmanchement d'un extracteur dans ledit alésage, l'extracteur comprenant une tige dentée dont la denture se présente sous forme de nervures longitudinales et une tête fixée à une des extrémités de ladite tige, l'emmanchement étant obtenu par insertion de la tige de l'extracteur dans ledit alésage et par percussion sur la tête dudit extracteur au moyen d'un outil de percussion, de sorte à coupler en rotation l'extracteur et la vis;
  3. c) extraction de la vis par desserrage de celle-ci au moyen d'une clé coopérant avec la tête de l'extracteur.
For this purpose, and according to a first aspect, the invention relates to a method for extracting a safety screw or a broken screw, said screw comprising a rod, the method being remarkable in that it comprises the following steps:
  1. a) drilling a bore in the screw in the longitudinal direction thereof by means of a drill diameter smaller than the diameter of the screw shank;
  2. b) fitting of an extractor in said bore, the extractor comprising a toothed shaft whose toothing is in the form of longitudinal ribs and a head fixed to one end of said rod, the fitting being obtained by inserting the rod the extractor in said bore and percussion on the head of said extractor by means of a percussion tool, so as to couple in rotation the extractor and the screw;
  3. c) extracting the screw by loosening it by means of a key cooperating with the head of the extractor.

Le procédé étant caractérisé en ce que l'étape (b) d'emmanchement comprend l'utilisation d'un mandrin de frappe disposé entre l'extracteur et l'outil de percussion et dont une extrémité présente une empreinte de forme conjuguée à celle de la tête de l'extracteur.The method being characterized in that the step (b) of fitting comprises the use of a striking mandrel disposed between the extractor and the percussion tool and one end of which has a shape imprint conjugated to that of the head of the extractor.

Selon des modes particuliers de réalisation, le procédé peut comprendre l'une ou l'autre des caractéristiques suivantes, prises isolément ou selon toutes les combinaisons possibles :

  • L'étape (a) de perçage de l'alésage comprend l'utilisation d'un foret comprenant une pointe en carbure de tungstène.
  • L'étape (a) de perçage de l'alésage est précédée d'une étape de mise en place d'un centreur sur la vis pour le positionnement et le guidage du foret.
  • L'extracteur comprend un manchon disposé à la base de la tête, le manchon présentant un diamètre supérieur à celui de la tige et inférieur à celui de la tête de sorte à former un épaulement avec la tige, et l'étape (b) d'emmanchement comprend l'emmanchement de la tige de l'extracteur dans la vis jusqu'à ce que ledit épaulement soit placé en butée contre la vis.
  • L'étape (c) d'extraction de la vis est suivie par une étape (d) de décrochage de l'extracteur de la vis dans laquelle il a été emmanché par utilisation d'un mandrin de décrochage.
According to particular embodiments, the method may comprise one or the other of the following characteristics, taken separately or according to all the possible combinations:
  • The step (a) of drilling the bore comprises the use of a drill bit comprising a tungsten carbide tip.
  • The step (a) of drilling the bore is preceded by a step of placing a centering device on the screw for positioning and guiding the drill.
  • The extractor comprises a sleeve disposed at the base of the head, the sleeve having a diameter greater than that of the stem and less than that of the head so as to form a shoulder with the stem, and step (b) of The fitting comprises fitting the rod of the extractor into the screw until said shoulder is placed against the screw.
  • The step (c) of extracting the screw is followed by a step (d) of unhooking the extractor of the screw in which it was fitted using a stall chuck.

Comme on l'aura compris à la lecture de la définition qui vient d'en être donnée, l'invention consiste à substituer à la tête de vis de sécurité ou cassée, la tête d'un extracteur pouvant être manipulé par des outils standards. Pour ce faire, l'invention va coupler en rotation l'extracteur avec la vis à desserrer en l'emmanchant de force dans un alésage pratiqué dans ladite vis. La présence de la tête et éventuellement d'un manchon sur l'extracteur formant un épaulement limite l'enfoncement de l'extracteur dans la vis par mise en butée de la tête de la vis sur la tête de l'extracteur ou sur l'épaulement formé par le manchon. Cette limitation de l'enfoncement de la tige de l'extracteur permet de confiner la tige de l'extracteur à l'intérieur de la vis et de ne pas risquer de venir accrocher le moyeu de la roue tout en permettant l'emmanchement d'une tige de longueur importante dans ladite vis.As will be understood from reading the definition that has just been given, the invention consists in substituting the security screw head or broken, the head of an extractor that can be manipulated by standard tools. To do this, the invention will couple in rotation the extractor with the screw to be loosened by forcing it into a bore in said screw. The presence of the head and possibly a sleeve on the extractor forming a shoulder limits the depression of the extractor in the screw by abutment of the head of the screw on the head of the extractor or on the shoulder formed by the sleeve. This limitation of the depression of the rod of the extractor makes it possible to confine the rod of the extractor inside the screw and not to risk coming to hook the hub of the wheel while allowing the fitting of a rod of significant length in said screw.

Selon un deuxième aspect, l'invention a pour objet un ensemble d'outils pour la mise en œuvre du procédé tel que décrit ci-dessus remarquable en ce qu'il comprend:

  • au moins un extracteur comprenant une tige dentée dont la denture se présente sous forme de nervures longitudinales, et une tête fixée à une des extrémités de ladite tige ;
  • au moins un foret de diamètre similaire au diamètre de la tige de l'extracteur, pour le perçage d'un alésage dans la vis ;
  • au moins un outil de percussion configuré pour percuter la tête dudit extracteur ;
  • au moins une clé configurée pour coopérer avec la tête de l'extracteur ;
  • un ou plusieurs centreurs pour le positionnement et le guidage des forets lors des opérations de perçage ;
  • un mandrin de frappe pour l'emmanchement de l'extracteur dans un alésage percé dans la vis, ledit mandrin de frappe présentant à une de ses extrémités une empreinte de forme conjuguée à la tête de l'extracteur.
According to a second aspect, the invention relates to a set of tools for implementing the method as described above remarkable in that it comprises:
  • at least one extractor comprising a toothed shaft whose teeth are in the form of longitudinal ribs, and a head fixed at one end of said rod;
  • at least one drill with a diameter similar to the diameter of the extractor rod, for drilling a bore in the screw;
  • at least one percussion tool configured to strike the head of said extractor;
  • at least one key configured to cooperate with the head of the extractor;
  • one or more centerers for positioning and guiding the drills during drilling operations;
  • a striking mandrel for fitting the extractor into a bore drilled in the screw, said striking mandrel having at one of its ends a shape of impression conjugate to the head of the extractor.

Avantageusement, l'utilisation d'un mandrin de frappe permet de tenir l'extracteur en position pour son emmanchement.Advantageously, the use of a typing mandrel makes it possible to hold the extractor in position for its fitting.

L'ensemble d'outils peut également comprendre un mandrin d'extraction pour le décrochage de l'extracteur de la vis dans lequel il est emmanché.The tool set may also include an extraction mandrel for unhooking the extractor of the screw into which it is fitted.

De préférence, l'extracteur comprend un manchon disposé à la base de la tête, le manchon présentant un diamètre supérieur à celui de la tige et inférieur à celui de la tête de sorte à former un épaulement avec la tige. De préférence, la tête de l'extracteur est hexagonale. De préférence encore, l'extracteur est en acier.Preferably, the extractor comprises a sleeve disposed at the base of the head, the sleeve having a diameter greater than that of the stem and less than that of the head so as to form a shoulder with the rod. Preferably, the head of the extractor is hexagonal. More preferably, the extractor is steel.

L'extracteur selon l'invention est remarquable en ce qu'il permet d'avoir un emmanchement droit présentant une surface de contact importante avec la vis à desserrer, permettant d'appliquer un couple de desserrage pouvant aller jusqu'à de 160 N.m ou plus pour le desserrage de la vis. L'emmanchement de l'extracteur jusqu'à la mise en butée de la tête ou de l'épaulement présenté par le manchon permet d'une part de pouvoir contrôler la longueur d'enfoncement de la tige et dont la contraindre à ne pas dépasser de la tige de la vis. D'autre part, la mise en butée permet d'éviter les battements lors de la manipulation de l'extracteur qui nuiraient à sa retenue dans la vis, la tête ou le manchon se plaçant en appui contre la vis.The extractor according to the invention is remarkable in that it makes it possible to have a straight fitting having a large contact surface with the screw to be loosened, making it possible to apply a loosening torque of up to 160 Nm or more for loosening the screw. The fitting of the extractor until the abutment of the head or the shoulder presented by the sleeve makes it possible firstly to be able to control the length of insertion of the rod and to constrain it not to exceed of the screw rod. On the other hand, the abutment avoids the beats during the manipulation of the extractor which would affect its retention in the screw, the head or the sleeve being placed in abutment against the screw.

Selon des modes particuliers de réalisation, l'ensemble selon l'invention peut comprendre l'une ou l'autre des caractéristiques suivantes, prises isolément ou selon toutes les combinaisons possibles :

  • L'ensemble comprend au moins un foret et au moins un des forets a une pointe en carbure de tungstène.
  • L'ensemble comprend au moins un centreur pour le positionnement et le guidage d'un foret, et au moins un des centreurs se présente sous forme d'un cône tronqué traversé de part et d'autre, selon sa direction longitudinale, par un conduit central, ledit conduit ayant un diamètre supérieur à celui du foret et/ou de la tige de l'extracteur.
  • L'ensemble comprend au moins un centreur pour le positionnement et le guidage d'un foret, et en ce qu'au moins un des centreurs se présente sous forme d'une douille creuse, de corps cylindrique ou tronconique traversée par un conduit central de diamètre supérieur à celui du foret et/ou de la tige de l'extracteur; ledit conduit central étant en communication avec une cavité interne débouchant sur une des extrémités du corps, l'embouchure de la cavité interne étant dimensionnée pour coiffer la tête de vis, de préférence le centreur présente sur son extrémité opposée à celle s'ouvrant sur la cavité interne, une protubérance reproduisant la forme la tête de l'extracteur, ladite protubérance étant traversée par ledit conduit.
  • L'ensemble comprend au moins un centreur, et moins un des centreurs se présente sous forme d'un corps cylindrique présentant sur au moins une de ses extrémités une empreinte de forme conjuguée à une tête de vis hexagonale et traversé selon sa longueur par un conduit central, ledit conduit ayant un diamètre supérieur à celui du foret et/ou de la tige de l'extracteur. De préférence, le corps cylindrique présente deux plats diamétralement opposés. De préférence encore, le centreur présente une empreinte conjuguée à une tête de vis hexagonale à chacune de ses extrémités, lesdites empreintes ayant des dimensions différentes.
  • Au moins un des centreurs est en matériau plastique, de préférence en polyoxyméthylène (POM).
  • L'ensemble comprend un mandrin de décrochage, ledit mandrin de décrochage présentant à une de ses extrémités une fourche comprenant deux dents d'épaisseur croissante entre leur pointe et leur base, et de préférence les deux dents sont parallèles entre elles, et l'écartement entre les dents du mandrin de décrochage est inférieur au diamètre de la tête de l'extracteur.
According to particular embodiments, the assembly according to the invention can comprise one or the other of the following characteristics, taken separately or in any possible combination:
  • The assembly includes at least one drill bit and at least one of the drills has a tungsten carbide tip.
  • The assembly comprises at least one centering device for positioning and guiding a drill, and at least one of the centering devices is in the form of a truncated cone traversed on either side, along its longitudinal direction, by a conduit central, said duct having a diameter greater than that of the drill and / or the rod of the extractor.
  • The assembly comprises at least one centering device for positioning and guiding a drill, and in that at least one of the centering devices is in the form of a hollow bushing, of a cylindrical or frustoconical body traversed by a central conduit of diameter greater than that of the drill and / or the rod of the extractor; said central duct being in communication with an internal cavity opening on one of the ends of the body, the mouth of the internal cavity being sized to cover the screw head, preferably the centraliser on its end opposite to that opening on the internal cavity, a protrusion reproducing the shape of the head of the extractor, said protuberance being traversed by said conduit.
  • The assembly comprises at least one centering device, and at least one of the centering devices is in the form of a cylindrical body having on at least one of its ends an impression of shape conjugated to a hexagonal screw head and traversed along its length by a conduit central, said duct having a diameter greater than that of the drill and / or the rod of the extractor. Preferably, the cylindrical body has two diametrically opposed plates. More preferably, the centraliser has a fingerprint conjugated to a hexagonal screw head at each of its ends, said fingerprints having different dimensions.
  • At least one of the centralizers is made of plastic material, preferably polyoxymethylene (POM).
  • The assembly comprises a stall chuck, said stall chuck having at one of its ends a fork comprising two teeth of increasing thickness between their tip and their base, and preferably the two teeth are parallel to each other, and the spacing between the teeth of the stall chuck is smaller than the diameter of the extractor head.

Selon un troisième aspect, l'invention concerne l'utilisation d'un ensemble tel que défini plus haut pour l'extraction d'une vis de sécurité ou d'une vis cassée sur une roue de véhicule.According to a third aspect, the invention relates to the use of an assembly as defined above for the extraction of a safety screw or a broken screw on a vehicle wheel.

L'invention sera bien comprise et d'autres aspects et avantages apparaîtront clairement au vu de la description qui suit, donnée à titre d'exemple en référence aux planches de dessins annexées sur lesquelles :

  • La figure 1 présente un extracteur selon l'invention.
  • La figure 2 est une vue en coupe présentant l'étape de perçage d'une vis de sécurité au moyen d'un foret et d'un centreur selon l'invention.
  • Les figures 3 à 5 illustrent différents centreurs selon l'invention.
  • La figure 6 présente l'étape d'emmanchement de l'extracteur selon l'invention.
  • La figure 7 présente le mandrin de décrochage selon l'invention.
  • La figure 8 présente l'étape de décrochage de l'extracteur de la vis dans laquelle il est emmanché.
The invention will be well understood and other aspects and advantages will become apparent from the following description, given by way of example with reference to the accompanying drawings in which:
  • The figure 1 presents an extractor according to the invention.
  • The figure 2 is a sectional view showing the step of drilling a safety screw by means of a drill and a centraliser according to the invention.
  • The Figures 3 to 5 illustrate different centralizers according to the invention.
  • The figure 6 presents the step of fitting the extractor according to the invention.
  • The figure 7 presents the stall chuck according to the invention.
  • The figure 8 presents the step of unhooking the extractor of the screw into which it is fitted.

Dans la description qui suit, le terme « comprendre » est synonyme de « inclure » et n'est pas limitatif en ce qu'il autorise la présence d'autres éléments dans le dispositif ou le véhicule auquel il se rapporte. Il est entendu que le terme « comprendre » inclut les termes « consister en ».In the following description, the term "understand" is synonymous with "include" and is not limiting in that it allows the presence of other elements in the device or the vehicle to which it refers. It is understood that the term "understand" includes the words "consist of".

Dans le présent mémoire, le procédé selon l'invention va être décrit en parallèle des outils selon l'invention pour la mise en œuvre dudit procédé.In the present specification, the method according to the invention will be described in parallel with the tools according to the invention for the implementation of said method.

On se référera en premier lieu à la figure 1 sur laquelle est représenté un extracteur 1 utilisé pour la mise en œuvre du procédé d'extraction d'une vis telle qu'une vis de sécurité ou une vis cassée. L'extracteur 1 selon l'invention comprend une tige 3 dentée dont la denture, sous forme de nervures 5 saillantes, s'étend longitudinalement selon la longueur de la tige 3, si bien qu'une coupe transversale de la tige montre une configuration en étoile. L'extracteur 1 présente également une tête 7 qui est de préférence de forme hexagonale de sorte à pouvoir être manipulée par les clés standards. L'extracteur 1 est avantageusement en acier. La tête 7 et la tige 3 sont fixées l'une à l'autre de manière irréversible de sorte à ce que lors de l'enfoncement de la tige 3 dans la vis la tête puisse servir de butée pour limiter l'enfoncement de l'extracteur et d'appui pour éviter des battements lors des manipulations comme nous le verrons plus loin.We will first refer to the figure 1 on which is represented an extractor 1 used for the implementation of the method of extracting a screw such as a safety screw or a broken screw. The extractor 1 according to the invention comprises a toothed rod 3 whose teeth, in the form of protruding ribs, extend longitudinally along the length of the rod 3, so that a cross section of the rod shows a configuration of star. The extractor 1 also has a head 7 which is preferably hexagonal in shape so that it can be handled by the standard keys. The extractor 1 is advantageously made of steel. The head 7 and the rod 3 are fixed to each other irreversibly so that during the insertion of the rod 3 into the screw the head can serve as a stop to limit the depression of the extractor and support to avoid beatings during manipulations as we will see later.

Selon un mode de réalisation préféré de l'invention, l'extracteur 1 comprend un manchon 9 disposé à la base de la tête 7 et présentant un diamètre supérieur à celui de la tige 3 et inférieur à celui de la tête 7 de sorte à former un épaulement 11 avec la tige 3.According to a preferred embodiment of the invention, the extractor 1 comprises a sleeve 9 disposed at the base of the head 7 and having a diameter greater than that of the rod 3 and less than that of the head 7 so as to form a shoulder 11 with the rod 3.

Le procédé selon l'invention comprend les étapes selon la revendication 1.The method according to the invention comprises the steps according to claim 1.

L'étape a) de perçage d'un alésage est représentée sur la figure 2 dans le cadre de l'extraction d'une vis 13 de sécurité dite « rentrante » en ce qu'elle est disposée au fond d'une cavité présentée par la jante 15 de la roue. Cette étape comprend donc le perçage d'un alésage 17 dans la vis 13 à desserrer selon la direction longitudinale de celle-ci au moyen d'un foret 19 de diamètre inférieur au diamètre de la tige 21 de la vis 13. Sur la figure, la vis de sécurité est représentée avec une tête 23 ronde. L'opération de perçage est en cours si bien que l'alésage n'a pas encore atteint la tige de la vis. Néanmoins, dans le procédé selon l'invention la tige de la vis est creusée selon tout ou partie de sa longueur. Par exemple la longueur de l'alésage pratiqué dans la vis est supérieure à 10 mm par exemple entre 10 et 20 mm selon les modèles de vis considérés. Cette longueur de l'alésage va permettre de recevoir un extracteur dont la tige a une longueur correspondante et qui offre donc une surface de contact importante. Cette surface de contact importante va permettre l'application d'un couple suffisant pour le desserrage de la vis.The step a) of drilling a bore is represented on the figure 2 in the context of the extraction of a security screw 13 called "reentrant" in that it is disposed at the bottom of a cavity presented by the rim 15 of the wheel. This step therefore comprises drilling a bore 17 in the screw 13 to be loosened in the longitudinal direction thereof by means of a drill 19 of diameter less than the diameter of the rod 21 of the screw 13. In the figure, the security screw is shown with a round head 23. The drilling operation is in progress so that the bore has not yet reached the screw shank. Nevertheless, in the process according to the invention, the screw shank is hollowed along all or part of its length. For example the length of the bore made in the screw is greater than 10 mm for example between 10 and 20 mm depending on the screw models considered. This length of the bore will allow to receive an extractor whose rod has a corresponding length and which therefore provides a large contact surface. This large contact surface will allow the application of sufficient torque for the loosening of the screw.

Le perçage est effectué au moyen d'un foret 19. De préférence, l'étape (a) de perçage de l'alésage se fait au moyen d'un foret comprenant une pointe en carbure de tungstène. Un tel foret peut par exemple être obtenu en fendant la pointe d'un foret traditionnel en acier pour y insérer une plaquette en carbure de tungstène. L'emploi d'un tel foret permet de faciliter le perçage des vis de sécurité lorsqu'elles sont composées d'un acier durci.The drilling is carried out by means of a drill 19. Preferably, the step (a) of drilling the bore is done by means of a drill comprising a tungsten carbide tip. Such a drill can for example be obtained by slitting the tip of a traditional steel drill bit to insert a tungsten carbide insert. The use of such a drill makes it easier to drill safety screws when they are made of a hardened steel.

Selon l'invention, le diamètre du foret est égal au diamètre de la tige de l'extracteur afin que la tige de l'extracteur puisse s'emmancher et être retenue dans l'alésage creusé dans la vis. On aura compris que l'alésage 17 doit être central par rapport à la tête 23 de la vis puisqu'il s'étend ensuite dans la tige 21 de cette vis. Aussi selon un mode de réalisation préféré de l'invention, et comme représenté sur la figure 2, l'étape (a) de perçage de l'alésage est réalisée en utilisant un centreur 25 pour le positionnement et le guidage du foret.According to the invention, the diameter of the drill is equal to the diameter of the rod of the extractor so that the rod of the extractor can be engaged and be retained in the bore dug in the screw. It will be understood that the bore 17 must be central relative to the head 23 of the screw since it then extends into the rod 21 of this screw. Also according to a preferred embodiment of the invention, and as represented on the figure 2 , the step (a) of drilling the bore is performed using a centralizer 25 for positioning and guiding the drill.

Selon le type de vis à desserrer ce centreur peut se présenter sous différentes formes. Dans le cas illustré en figure 2 où la vis est une vis dite « rentrante » car elle est positionnée au fond d'une cavité présentée par la jante, le centreur « à vis rentrantes » 25 se présentera avantageusement sous forme d'un cône tronqué percé d'un conduit central le traversant de part et d'autre selon sa direction longitudinale. Un tel centreur est représenté en figure 3. Le conduit 27 a un diamètre supérieur à celui du foret et a pour fonction le positionnement et le guidage de ce foret.Depending on the type of screw to loosen this centraliser can come in different forms. In the case illustrated in figure 2 where the screw is a so-called "re-entrant" screw because it is positioned at the bottom of a cavity presented by the rim, the "reentrant screw" centralizer 25 will advantageously be in the form of a truncated cone pierced by a central duct on crossing on both sides in its longitudinal direction. Such a centraliser is represented in figure 3 . The led 27 has a diameter greater than that of the drill and has the function of positioning and guiding this drill.

La figure 4 présente un autre exemple de réalisation d'un centreur 29 selon l'invention destiné au centrage et au guidage du foret dans le cas de vis dites « sortantes », en ce qu'elles se présentent en relief sur la jante. Le centreur 29 « à vis sortantes » va alors se présenter sous forme d'une douille creuse, de corps 31 cylindrique ou tronconique, et traversée par un conduit central 35 en communication avec une cavité interne 33 débouchant sur une des extrémités du corps 31. De préférence, la cavité interne 33 a une forme conique intérieure de sorte à ce que son diamètre diminue selon sa longueur depuis son embouchure. Cette configuration va permettre au centreur de coiffer la tête de vis et d'être retenu sur cette dernière. Le conduit central 35 de diamètre supérieur à celui de la tige du foret (donc de la tige de l'extracteur) est utilisé pour le positionnement et le guidage dudit foret. De préférence, le centreur 29 présente au niveau de l'extrémité opposée à celle s'ouvrant sur la cavité interne 33 une protubérance 37 reproduisant la forme la tête de l'extracteur, ladite protubérance 37 étant traversée par ledit conduit 35. Cette protubérance 37 permet à l'utilisateur d'utiliser un mandrin de frappe pour venir positionner et enfoncer le centreur 29 sur la tête de la vis.The figure 4 presents another embodiment of a centralizer 29 according to the invention for centering and guiding the drill in the case of so-called "outgoing" screws, in that they are in relief on the rim. The centralizer 29 "with outgoing screws" will then be in the form of a hollow socket, of cylindrical or frustoconical body 31, and traversed by a central duct 35 in communication with an internal cavity 33 opening on one of the ends of the body 31. Preferably, the inner cavity 33 has an inner conical shape so that its diameter decreases along its length from its mouth. This configuration will allow the centraliser to cap the screw head and be retained on the latter. The central duct 35 of diameter greater than that of the drill shaft (and therefore of the extractor rod) is used for positioning and guiding said drill bit. Preferably, the centralizer 29 has at the end opposite to that opening on the inner cavity 33 a protrusion 37 reproducing the shape of the head of the extractor, said protuberance 37 being traversed by said duct 35. This protuberance 37 allows the user to use a chuck to come to position and drive the centralizer 29 on the head of the screw.

Dans les cas où la tête de la vis est montée libre en rotation (tête folle), l'homme du métier aura avantage à utiliser un centreur à empreinte 39 tel que représenté sur la figure 5. Ce centreur à empreinte se présente sous forme d'une douille de corps cylindrique 41, et présentant sur au moins une de ses extrémités une empreinte 43 de forme conjuguée à une tête de vis hexagonale. Le corps 41 présente un conduit central 45 le traversant de part et d'autre selon sa direction longitudinale. Le conduit 45 a un diamètre supérieur à celui de la tige du foret (et donc de la tige de l'extracteur) et est utilisé pour le positionnement et le guidage du foret. L'empreinte 43 va retenir la tête en position et l'empêcher de tourner sous l'action du foret lors de l'opération de perçage. De préférence, le corps 31 présente deux plats 47 diamétralement opposés pour faciliter la préhension et la retenue en position du centreur. De préférence encore, le centreur présente une empreinte conjuguée à une tête de vis hexagonale à chacune de ses extrémités, lesdites empreintes ayant des dimensions différentes.In cases where the head of the screw is mounted free to rotate (crazy head), the skilled person will benefit from using an impression centering device 39 as shown in FIG. figure 5 . This impression centering device is in the form of a cylindrical body socket 41, and having on at least one of its ends an impression 43 of shape conjugated to a hexagonal screw head. The body 41 has a central duct 45 passing therethrough on both sides in its longitudinal direction. The conduit 45 has a diameter greater than that of the drill rod (and therefore the rod of the extractor) and is used for positioning and guiding the drill. The impression 43 will hold the head in position and prevent it from rotating under the action of the drill during the drilling operation. Preferably, the body 31 has two diametrically opposite plates 47 to facilitate gripping and retention in position of the centraliser. More preferably, the centraliser has a fingerprint conjugated to a hexagonal screw head at each of its ends, said fingerprints having different dimensions.

Selon une mise en œuvre préférée de l'invention, au moins un des centreurs est réalisé en matériau plastique, par exemple en polyoxyméthylène (POM) pour limiter les risques d'abimer la peinture et le vernis des jantes. Néanmoins, il est également possible de les réaliser en matériaux métalliques.According to a preferred embodiment of the invention, at least one of the centralizers is made of plastic material, for example polyoxymethylene (POM) to limit the risk of damaging the paint and varnish rims. Nevertheless, it is also possible to produce them in metallic materials.

Une fois l'alésage réalisé, l'extracteur selon l'invention peut être mis en place. Pour ce faire, la tige de l'extracteur est emmanchée de force dans ledit alésage au cours d'une étape b) d'emmanchement illustrée à la figure 6. L'emmanchement se fait par coulissement longitudinal le long de l'alésage et ce coulissement est généré par percussion sur la tête de l'extracteur au moyen d'un outil de percussion, par exemple un marteau. L'emmanchement de l'extracteur dans la vis va coupler en rotation l'extracteur et la vis.Once the bore is made, the extractor according to the invention can be put in place. To do this, the rod of the extractor is force-fitted into said bore during a step b) of fitting shown in FIG. figure 6 . The fitting is made by longitudinal sliding along the bore and this sliding is generated by percussion on the head of the extractor by means of a percussion tool, for example a hammer. The fitting of the extractor into the screw will couple in rotation the extractor and the screw.

L'étape (b) d'emmanchement est réalisée en plaçant un mandrin de frappe 51 entre l'extracteur 1 et le marteau 49. Le mandrin de frappe 51 selon l'invention comprend une extrémité présentant une empreinte 53 de forme conjuguée à celle de la tête 7 de l'extracteur 1. L'utilisation d'un tel mandrin permet de tenir l'extracteur en position pour son emmanchement.The step (b) of fitting is carried out by placing a striking mandrel 51 between the extractor 1 and the hammer 49. The striking mandrel 51 according to the invention comprises an end having a footprint 53 of shape conjugated to that of the head 7 of the extractor 1. The use of such a mandrel keeps the extractor in position for its fitting.

Avantageusement, l'extracteur 1 est emmanché jusqu'à ce que la base de sa tête vienne en butée contre la tête 27 de la vis, ou lorsque l'extracteur présente un manchon 9 contre l'épaulement 11 formé par le manchon 9 avec la tige 3. Cette limitation de l'enfoncement de l'extracteur 1 permet de s'assurer que la tige 3 de celui-ci reste dans la tige 21 de la vis 13. En effet, si la tige de l'extracteur dépassait de l'extrémité de la tige de la vis, elle s'accrocherait au moyeu de la roue ce qui rendrait le desserrage de la vis plus difficile.Advantageously, the extractor 1 is fitted until the base of its head comes into abutment against the head 27 of the screw, or when the extractor has a sleeve 9 against the shoulder 11 formed by the sleeve 9 with the 3. This limitation of the depression of the extractor 1 ensures that the rod 3 thereof remains in the rod 21 of the screw 13. In fact, if the rod of the extractor exceeded the end of the screw shank, it would cling to the hub of the wheel which would make the loosening of the screw more difficult.

Une fois l'extracteur en position, l'extraction de la vis par desserrage de celle-ci est réalisée lors d'une étape c) d'extraction (non représentée) au moyen d'une clé coopérant avec la tête de l'extracteur. Le caractère droit de l'emmanchement associé à la surface de contact étendu permet d'obtenir un couple de desserrage au moins égal à 160 N.m, nécessaire au desserrage des vis de sécurité des roues de véhicule.Once the extractor in position, the extraction of the screw by loosening thereof is carried out during a step c) extraction (not shown) by means of a key cooperating with the head of the extractor . The straight character of the fitting associated with the extended contact surface makes it possible to obtain a loosening torque of at least 160 Nm, necessary for the loosening of the safety screws of the vehicle wheels.

Selon un mode de réalisation préféré de l'invention, l'étape (c) d'extraction de la vis est suivie par une étape (d) de décrochage de l'extracteur de la vis dans laquelle il a été emmanché, de préférence par utilisation d'un mandrin de décrochage 55 tel que représenté à la figure 7. La séparation de la vis 13 et de l'extracteur 1 permet de pouvoir réutiliser ledit extracteur 1 pour l'extraction d'une autre vis 13. L'opération de décrochage peut être réalisée lorsque les extracteurs 1 présentent un manchon 9 définissant un espace entre la tête 23 de la vis 13 et la tête 7 de l'extracteur 1.According to a preferred embodiment of the invention, the step (c) of extracting the screw is followed by a step (d) of unhooking the extractor of the screw into which it has been fitted, preferably by use of a stall chuck 55 as shown in FIG. figure 7 . The separation of the screw 13 and the extractor 1 allows to reuse said extractor 1 for the extraction of another screw 13. The stall operation can be performed when the extractors 1 have a sleeve 9 defining a space between the head 23 of the screw 13 and the head 7 of the extractor 1.

De préférence, le mandrin de décrochage 55 présente à une de ses extrémités une fourche 57 comprenant deux dents 59 parallèles d'épaisseur croissante entre leur pointe 61 et leur base 63. L'écartement entre les dents 59 du mandrin de décrochage 55 est choisi pour être supérieur au diamètre du manchon 9 et inférieur au diamètre de la tête 7 de l'extracteur. Dans le cas où le mandrin de décrochage est utilisé avec un extracteur ne présentant pas de manchon, l'écartement entre les dents du mandrin de décrochage doit être supérieur au diamètre de la tige dudit extracteur.Preferably, the stalling mandrel 55 has at one of its ends a fork 57 comprising two parallel teeth 59 of increasing thickness between their point 61 and their base 63. The spacing between the teeth 59 of the stalling mandrel 55 is chosen to be greater than the diameter of the sleeve 9 and less than the diameter of the head 7 of the extractor. In the case where the stall chuck is used with an extractor having no sleeve, the spacing between the teeth of the stall chuck must be greater than the diameter of the rod of said extractor.

L'étape d) est illustrée sur la figure 8. Comme on peut le voir, la vis 13 est tenue par les mâchoires 65 d'un étau. Le mandrin de décrochage 55 est positionné de sorte à placer le manchon de l'extracteur 1 entre ses dents 59. Le manchon est alors enfoncé entre les dents 59 de la fourche par percussion. Les dents 59 ayant une hauteur croissante qui, à la base desdites dents est supérieure à la hauteur du manchon, l'enfoncement de l'extracteur 1 va soulever ledit extracteur 1 pour le faire sortir en partie de la vis 13.Step d) is illustrated on the figure 8 . As can be seen, the screw 13 is held by the jaws 65 of a vise. The stalling mandrel 55 is positioned to place the sleeve of the extractor 1 between its teeth 59. The sleeve is then pressed between the teeth 59 of the fork by percussion. The teeth 59 having an increasing height which at the base of said teeth is greater than the height of the sleeve, the depression of the extractor 1 will lift said extractor 1 to partially out of the screw 13.

Claims (13)

  1. A method of extracting a safety screw or broken screw, the said screw (13) comprising a rod (21) and possibly a head (23), the method comprising the following steps:
    a) drilling a bore (17) in the screw (13) in the longitudinal direction thereof by means of a drill (19) of a diameter smaller than the diameter of the rod (21) of the screw (13);
    b) fitting an extractor (1) in the said bore (17), the extractor (1) comprising a serrated rod (3) whose teeth are in the form of longitudinal ribs (5) and a head (7) fixed at one end of the said rod (3), with the fitting being obtained by inserting the rod (3) of the extractor (1) in the said bore (17) and by hitting on the head (7) of the said extractor (1) by means of a percussion tool (49) so as to rotationally connect the extractor (1) and the screw (13);
    c) extraction of the screw (13) by loosening it by means of a wrench of an appropriate size as regards the head (7) of the extractor;
    the process being characterised in that the step (b) of fitting comprises the use of a striking pin (51) positioned between the extractor (1) and the percussion tool (49) and an end of which has a mark (53) in a shape that interlocks with the one of the head (7) of the extractor (1).
  2. A method according to claim 1 characterised in that step (a) of drilling the bore (17) comprises:
    - the use of a drill (19) comprising a tungsten carbide tip, and/or
    - is preceded by a step of setting up a centring device (25, 29, 39) on the screw (13) for positioning and guiding the drill (19).
  3. A method according to one of claims 1 or 2 characterised in that the extractor (1) comprises a sleeve (9) arranged at the base of its head (7) and having a larger diameter greater than that of its rod (3) and smaller than that of its head (7) so as to form a shoulder (11) with the rod (3) and in that the step (b) of fitting comprises the fitting of the rod (3) of the extractor (1) in the screw (13) until the said shoulder (11) abuts against the screw (13).
  4. A method according to one of claims 1 to 3 characterised in that the step (c) of extraction of the screw (13) is followed by a step (d) of unhooking the extractor (1) from the screw (13) in which it was fitted by using an extraction mandrel (55).
  5. A set of tools for the implementation of the method according to one of claims 1 to 4, comprising:
    - at least an extractor (1) comprising a serrated rod (3) of which the teeth (5) are in the form of longitudinal ribs (5), and a head (7) fixed at one of the ends of the said rod (3);
    - at least a drill (19) of a diameter similar to the diameter of the rod (3) of the extractor (1), for drilling a bore (17) in the screw (13);
    - at least a percussion tool (49) set up to hit the head (7) of the said extractor (1);
    - at least a wrench configured to fit the head (7) of the extractor (1);
    characterised in that the set of tools further comprises:
    - a striking pin (51) for the fitting of the extractor (1) in a bore (17) that has been drilled in the screw (13), the said striking pin (51) having a mark (53) at one of its ends in a shape that interlocks with the head (7) of the extractor (1);
    - one or many centring devices (25, 29, 39) for the positioning and guiding of the drill (19) during the drilling operations.
  6. A set of tools according to claim 5 characterised in that the extractor (1) further comprises a sleeve (9) at the bottom of the head (7), the sleeve having a diameter that is larger than that of the rod (3) and smaller than that of the head (7) so as to form a shoulder (11) with the rod (3); and/or in that the head (7) of the extractor is hexagonal.
  7. A set according to claim 5 or 6 comprising at least one drill (19) of a diameter similar to the diameter of the rod (3) of the extractor (1), for drilling a bore (17) in the screw (13), the set being characterised in that at least one of the drills (19) has a tungsten carbide tip.
  8. A set of tools according to one of claims 5 to 7 comprising at least one centring device (25) for the positioning and guiding of a drill, the set being characterised in that at least one of the centring devices (25) is in the form of a truncated cone traversed on both sides, in its longitudinal direction, by a central conduit (27), the said conduit (27) having a larger diameter than that of the drill (19).
  9. A set of tools according to one of claims 5 to 8 comprising at least one centring device (29) for the positioning and guiding of the drill, the set being characterised in that at least one of the centring devices (29) is in the form of a hollow casing with a cylindrical or frustoconical body traversed by a central conduit (35) of a larger diameter than that of the drill (19); the said central conduit (35) being in contact with an internal cavity (33) opening onto one of the ends of the body (31), the mouth of the internal cavity being dimensioned to cover the screw head; the centring device (29) preferably having a protrusion (37) at its end opposite to that overlooking the internal cavity (33), which has the shape of the head (7) of the extractor (1), the said protrusion (37) being traversed by the said conduit (35).
  10. A set of tools according to one of claims 5 to 9 comprising at least one centring device (39) for the positioning and guiding of a drill, the set being characterised in that at least one of the centring devices (39) is in the form of a cylindrical body (41), and having a mark (43) on at least one of its ends in a shape that interlocks with a head of a hexagonal screw and traversed along its length by a central conduit (45), the said conduit (45) having a larger diameter than that of the drill (19), and the cylindrical body preferably having two diametrically opposite flat sides.
  11. A set of tools according to one of claims 7 to 10 characterised in that at least one of the centring devices (25, 29, 39) is made of plastic, preferably polyoxymethylene (POM).
  12. A set of tools according to one of claims 5 to 11 comprising an extraction mandrel (55) for releasing the extractor (1) from the screw (13) in which it is fitted, the set being characterised in that the said extraction mandrel (55) has a fork (57) at one of its ends, which comprises two teeth (59) of increasing thickness between their tip (61) and their base (63) and preferably parallel to one another, and in that the spacing between the teeth (59) of the extraction mandrel (55) is smaller than the diameter of the head (7) of the extractor (1).
  13. Use of a set of tools according to one of claims 5 to 12 for the extraction of a safety screw or a broken screw on a wheel of a vehicle.
EP16315008.9A 2016-09-09 2016-09-09 Method for extracting safety screws and extractor for implementation of the method Active EP3292958B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE16315008.9T DE16315008T1 (en) 2016-09-09 2016-09-09 EXTRACTION METHOD FOR A FUSE SCREW AND EXTRACTOR FOR USING THE PROCESS
DK16315008.9T DK3292958T3 (en) 2016-09-09 2016-09-09 PROCEDURE FOR EXTRACTING A SCREW AND EXTRACTOR FOR EXERCISING THE PROCEDURE
ES16315008T ES2774470T3 (en) 2016-09-09 2016-09-09 Screw removal and extractor procedure for procedure implementation
EP16315008.9A EP3292958B1 (en) 2016-09-09 2016-09-09 Method for extracting safety screws and extractor for implementation of the method
BE20175246A BE1024703B1 (en) 2016-09-09 2017-04-07 METHOD OF EXTRACTING SAFETY SCREWS FOR MOTOR VEHICLE WHEELS AND EXTRACTOR FOR CARRYING OUT THE METHOD
FR1770354A FR3055823B3 (en) 2016-09-09 2017-04-07 METHOD FOR EXTRACTING SAFETY SCREWS FOR MOTOR VEHICLE WHEELS AND EXTRACTOR FOR IMPLEMENTING THE METHOD
US15/699,608 US10478952B2 (en) 2016-09-09 2017-09-08 Process for extracting security screw for wheels of motor vehicle and extractor for executing the process
TW106130846A TWI746632B (en) 2016-09-09 2017-09-08 Process for extracting safety screw for motor vehicle wheels, extractor and set of tools for executing the process and use of the extractor and set of tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16315008.9A EP3292958B1 (en) 2016-09-09 2016-09-09 Method for extracting safety screws and extractor for implementation of the method

Publications (2)

Publication Number Publication Date
EP3292958A1 EP3292958A1 (en) 2018-03-14
EP3292958B1 true EP3292958B1 (en) 2019-11-20

Family

ID=57047145

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Application Number Title Priority Date Filing Date
EP16315008.9A Active EP3292958B1 (en) 2016-09-09 2016-09-09 Method for extracting safety screws and extractor for implementation of the method

Country Status (8)

Country Link
US (1) US10478952B2 (en)
EP (1) EP3292958B1 (en)
BE (1) BE1024703B1 (en)
DE (1) DE16315008T1 (en)
DK (1) DK3292958T3 (en)
ES (1) ES2774470T3 (en)
FR (1) FR3055823B3 (en)
TW (1) TWI746632B (en)

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CA3107709A1 (en) * 2018-08-21 2020-02-27 Grip Holdings Llc Fastener extractor device
USD878882S1 (en) * 2018-08-29 2020-03-24 Chia-Hao Huang Bolt extractor
CN112692788A (en) * 2021-03-01 2021-04-23 王伟 Method for taking rusted dead broken screw

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Also Published As

Publication number Publication date
DE16315008T1 (en) 2019-01-03
US20180071903A1 (en) 2018-03-15
DK3292958T3 (en) 2020-03-02
BE1024703B1 (en) 2018-06-07
FR3055823A3 (en) 2018-03-16
US10478952B2 (en) 2019-11-19
TWI746632B (en) 2021-11-21
ES2774470T3 (en) 2020-07-21
BE1024703A1 (en) 2018-05-29
FR3055823B3 (en) 2018-12-07
TW201815525A (en) 2018-05-01
EP3292958A1 (en) 2018-03-14

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