WO2004001237A1 - Fixation vissee - Google Patents

Fixation vissee Download PDF

Info

Publication number
WO2004001237A1
WO2004001237A1 PCT/GB2002/002832 GB0202832W WO2004001237A1 WO 2004001237 A1 WO2004001237 A1 WO 2004001237A1 GB 0202832 W GB0202832 W GB 0202832W WO 2004001237 A1 WO2004001237 A1 WO 2004001237A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
threaded
threaded member
cap
key
Prior art date
Application number
PCT/GB2002/002832
Other languages
English (en)
Inventor
Richard William Tirrell
Original Assignee
Auto Turned Products (Northants) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Auto Turned Products (Northants) Limited filed Critical Auto Turned Products (Northants) Limited
Priority to PCT/GB2002/002832 priority Critical patent/WO2004001237A1/fr
Priority to AU2002311460A priority patent/AU2002311460A1/en
Publication of WO2004001237A1 publication Critical patent/WO2004001237A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0069—Specially shaped nuts or heads of bolts or screws for rotations by a tool with holes to be engaged with corresponding pins on the tool or protruding pins to be engaged with corresponding holes on the tool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/14—Cap nuts; Nut caps or bolt caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/005—Measures against unauthorised operation of bolts, nuts or pins

Definitions

  • This invention relates to a screw-threaded fastening and, more particularly, to a screw-threaded fastening requiring a non-standard tool for un-screwing the fastening.
  • the preferred embodiment of the invention is intended particularly as a wheel-fastening for a motor vehicle, but it is to be understood that the invention is not limited t ⁇ this application and may, on the contrary, be applied to a wide range of screw-threaded fastenings where some degree of tamper-resistance is required.
  • tamper resistant fastenings to secure the wheels of a motor vehicle.
  • tamper resistant fastenings include a non-circular profile which can be engaged by a key to facilitate rotation of the fastening, but which cannot be rotated by means of standard tools (for example standard bi-hexagonal sockets).
  • tamper resistant fastenings are used to retain alloy wheels which are chosen, at least in part, for aesthetic considerations. Accordingly, it is important that the tamper resistant fastenings used do not detract from the aesthetic appeal of the wheels they secure. This factor, combined with the desire to provide as much tamper resistance as possible within a robust structure imposes severe limitations on the designer of tamper-resistant screw-threaded fastenings.
  • the preferred embodiment of the present invention provides a tamper resistant fastening screw-threaded which is suitable for use in retaining vehicle wheels, which is robust, which has a pleasing appearance, and which in the preferred embodiment is assembled by means of a particularly simple and efficient fabrication technique.
  • a screw- threaded fastening comprising: a screw-threaded member; and a cap rotatably mounted on the screw-threaded member; the screw-threaded member comprising a screw-threaded portion for screw-threaded engagement with a complementary screw- threaded member on or of a base, a shoulder for forcing an article into engagement with the base as the screw-threaded fastening is tightened, and a non-circular profile for engagement by a key for rotating the screw-threaded member; and the cap comprising a skirt which telescopically receives an end portion of the screw-threaded member, the skirt including relieved portions in the periphery thereof which may be moved, by rotation of the cap, into register with the non-circular profile of the screw- threaded member to facilitate the application of the key to the screw-threaded member and land portions between the relieved portions which at least partially cover the non- circular profile of the screw-threaded member when
  • the screw-threaded fastening is used to secure an object, for example the wheel of a motor vehicle, which includes a recess which receives the non- circular portion of the screw-threaded member and at least part of the skirt of the cap.
  • the recess is sized to receive the screw-threaded fastening with only a small radial clearance. Accordingly, when the screw-threaded fastening is in use the view which is presented to someone endeavouring the remove the fastening is of the cap which is partially received within the recess. Because the cap is rotatable relative to the screw threaded member, the application of a tool (for example a self-gripping wrench) to the cap is not effective to rotate the screw-threaded member.
  • a tool for example a self-gripping wrench
  • the cap In order to rotate the screw-threaded member the cap must be rotated to bring the relieved portions of the cap skirt into register with the non-circular profile of the screw- threaded member and a key applied to the non-circular profile of the screw-threaded member to facilitate rotation of the screw-threaded member.
  • the non-circular profile of the screw-threaded member is provided by means of relieved portions formed in the outer surface of a circular portion of the screw-threaded member.
  • the circular portion is a flange, one side of which defines the shoulder of the screw-threaded member.
  • the relieved portions of the screw-threaded member are part- cylindrical recesses in the periphery of the circular member.
  • the recesses in the screw-threaded member and/or the skirt of the cap limit the zone with which the key engages screw-threaded member to a relatively shallow circumferential band.
  • the components are preferably configured so that the key does not extend far inwardly from the overall circular profile of the portion of the screw-threaded member in which the relieved portions are formed.
  • the cap is retained on the screw-threaded member by means of an outwardly flared portion at the end of the screw-threaded member which is received in an under-cut groove within the cap.
  • the under-cut groove is of frusto-conical form and the outwardly flared portion of the nut closely conforms to the part-conical surface of the under-cut groove.
  • the components are assembled by forming a deformable end portion of the threaded member which has substantially the same diameter as the portion of the cap between the undercut groove and the open mouth thereof. The cap may accordingly be slid onto the screw-threaded member and the deformable region deformed outwardly into the undercut.
  • the components are shaped such that the required deformation of the end region of the screw-threaded member can be achieved simply by forcing the cap onto the screw-threaded member.
  • the force required is applied as a percussive force by means of a blow to the cap. It has been found that such an arrangement forms a reliable and high strength connection between the cap and the screw-threaded member, whilst at the same time provides a rotatable connection which is not capable of transferring substantial torque from the cap to the screw-threaded member.
  • Figure 1 is a longitudinal cross-section of a preferred embodiment of the invention
  • Figures 2 and 3 are respectively a longitudinal cross-sectional view and end view of the screw-threaded member of the fastening of Figure 1, prior to assembly with the cap;
  • Figures 4 and 5 are respectively a longitudinal cross-sectional view and end view of the cap of the screw-threaded fastening of Figure 1;
  • Figures 6 and 7 are respectively a longitudinal cross-section view and end view of a key for the screw-threaded fastening of Figure 1.
  • the screw-threaded fastening 1 shown in the drawings is in the form of a wheel nut for a motor vehicle.
  • the fastening comprises a screw-threaded member 2, a cap 3, and a captive washer 4.
  • the screw-threaded member includes an axial bore 5 formed with screw-threads 6 for engaging the threads of a stud of the hub of a motor vehicle.
  • the preferred embodiment of the invention is embodied as a nut, it will be appreciated that the invention can be embodied as a bolt which can be secured to a threaded aperture provided, for example, in the hub of a motor vehicle.
  • the screw-threaded member defines a shoulder 7 which, via the washer 4 is used to clamp a wheel against the hub of a motor vehicle.
  • the shoulder 7 is formed by one side of a flange 8 which is an integral part of the screw-threaded member 2.
  • the cap 3 is retained on the screw-threaded member 2 by means of an outwardly flared portion 9 of the screw-threaded member which is received within an undercut groovelO of the cap.
  • the undercut groovelO is substantially frusto-conical in shape and the outwardly flared portion 9 lies against the part-conical surface of the undercut groove.
  • the external profile 13 of the flange 8 is circular.
  • a plurality of part-cylindrical recesses 14 are formed in the material of the flange.
  • a key is required.
  • a key suitable for rotating the screw-threaded member of Figures 2 and 3 is illustrated in Figures 6 and 7.
  • the key includes a skirt 15 which has formed on the inner surface thereof a multiplicity of projections 16. The key is sized such that the projections 16 project a small distance into the recesses 14 so that torque can be applied by the key to the screw-threaded member.
  • the key 17 includes a portion 18 formed with a conventional drive profile, for example a hexagonal profile. It will be noted that the profile of the projections 16 is not complementary to that of the recesses 14. The projections 16 are sized such that they project only a small distance into the recesses 14, for reasons which will be explained in more detail below.
  • the number and position of the recesses 14 may be varied in order to provide a large number of "differs".
  • the recesses can vary in number.
  • the angular position of the recesses relative to each other may also be varied.
  • looking at Figure 3 two of the recesses may remain opposite sides of a diameter and the other two recesses may be varied in position relative to that diameter in order to achieve the required number of differs.
  • Each combination of recesses will have associated with it a unique key 17.
  • each projection 16 has associated therewith a recess 19 in the outer surface of the key. It will further be noted that if an attempt is made to produce a "master key" having only one projection 16 by taking a standard key and grinding off all but one of the projections 16, the effect of grinding off the projections will be to break through the peripheral skirt 15 of the key at each point where a projection is ground off. The resultant gap in the peripheral skirt will substantially weaken the key and if an attempt is made to use such a key to remove a nut the key will deform allowing the one remaining projection 16 to cam out of the recess in which it is positioned. This feature substantially reduces the risk of unauthorised removal of the wheel nut.
  • the cap 3 includes a skirt 20 in which recesses 21 are formed.
  • the recesses 21 correspond to the recesses 14 of the screw-threaded member so that by rotating the cap 3 the recesses 21 may be brought into register with the recesses 14 to allow the key to be applied to the recesses 14.
  • the portions 22 of the skirt 20 between the recesses 21 form lands which prevent general access to the flange 8.
  • the recesses 21 do not extend to the full axial length of the skirt 20 with the result that the portions 23 of the skirt 20 which are located in line with the recesses 21 limit access to the recesses 21 and 14 to a relatively shallow circumferential band. This shallow circumferential band corresponds to the portions of the projections 16 which, in use, enter the recesses 14.
  • the proximal end of the threaded member includes a relatively thin-walled extension 24.
  • this portion 24 has been deformed outwardly to form the flared portion 9. It has been found that the required outward deflection of the extension portion 24 can be produced if the cap is slid onto the screw-threaded member until the end face 25 of the portion 24 engages a shoulder 26 provided at one end of the undercut groove 10. If the nut is then supported and a percussive blow is applied to the cap the portion 24 will deform outwardly to the configuration illustrated in Figure 1.
  • a recess will be provided in the member to be fastened which will receive a washer 4, flange 8 and at least part of the skirt 20.
  • a washer 4 flange 8 and at least part of the skirt 20.
  • the cap 3 may be made of a pleasing appearance and may, for example, be chromium plated steel or of polished stainless steel.

Landscapes

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

Abstract

L'invention concerne une fixation vissée et, plus particulièrement, une fixation vissée nécessitant l'utilisation d'un outil spécial pour la dévisser. Cette fixation (1) comprend un élément fileté (2) et un chapeau (3) monté rotatif sur ledit élément. Cet élément (2) comprend une partie (6) destinée à coopérer par vissage avec un élément fileté complémentaire placé sur une base, un épaulement (7) et un profil non circulaire destiné à coopérer à l'aide d'une clé afin de faire tourner ledit élément (2). Le chapeau (3) comprend une jupe dotée de parties évidées dans sa périphérie, pouvant se déplacer par rotation du chapeau, en correspondance avec le profil non circulaire de l'élément (2) afin de faciliter l'application de la clé audit élément (2).
PCT/GB2002/002832 2002-06-20 2002-06-20 Fixation vissee WO2004001237A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB2002/002832 WO2004001237A1 (fr) 2002-06-20 2002-06-20 Fixation vissee
AU2002311460A AU2002311460A1 (en) 2002-06-20 2002-06-20 Screw-threaded fastening

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2002/002832 WO2004001237A1 (fr) 2002-06-20 2002-06-20 Fixation vissee

Publications (1)

Publication Number Publication Date
WO2004001237A1 true WO2004001237A1 (fr) 2003-12-31

Family

ID=29797717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/002832 WO2004001237A1 (fr) 2002-06-20 2002-06-20 Fixation vissee

Country Status (2)

Country Link
AU (1) AU2002311460A1 (fr)
WO (1) WO2004001237A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671453A (zh) * 2012-09-18 2014-03-26 北汽福田汽车股份有限公司 螺栓连接防拆卸机构
WO2017143040A1 (fr) 2016-02-16 2017-08-24 Mcgard Llc Élément de fixation de haute sécurité à élément de retenue d'enveloppe voilé
WO2019079178A1 (fr) 2017-10-16 2019-04-25 Mcgard Llc Élément de fixation de haute sécurité à pièces multiples

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2359730A1 (fr) * 1976-07-26 1978-02-24 Zeppellini Dino Ecrou ou boulon antivol pour roue de vehicule, pour automobile en particulier
GB2006371A (en) * 1977-10-04 1979-05-02 Hart H Fastening means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2359730A1 (fr) * 1976-07-26 1978-02-24 Zeppellini Dino Ecrou ou boulon antivol pour roue de vehicule, pour automobile en particulier
GB2006371A (en) * 1977-10-04 1979-05-02 Hart H Fastening means

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671453A (zh) * 2012-09-18 2014-03-26 北汽福田汽车股份有限公司 螺栓连接防拆卸机构
CN103671453B (zh) * 2012-09-18 2015-10-28 北汽福田汽车股份有限公司 螺栓连接防拆卸机构
WO2017143040A1 (fr) 2016-02-16 2017-08-24 Mcgard Llc Élément de fixation de haute sécurité à élément de retenue d'enveloppe voilé
WO2017143050A1 (fr) 2016-02-16 2017-08-24 Mcgard Llc Élément de fixation haute sécurité à élément de maintien attaché à enveloppe interne
WO2017143058A1 (fr) * 2016-02-16 2017-08-24 Mcgard Llc Élément de fixation à haute sécurité doté d'un élément de retenue d'enveloppe externe
US10280966B2 (en) 2016-02-16 2019-05-07 Mcgard Llc High security fastener with internal shroud buckled retainer
US10280965B2 (en) 2016-02-16 2019-05-07 Mcgard Llc High security fastener with buckled shroud retainer
US10443645B2 (en) 2016-02-16 2019-10-15 Mcgard Llc High security fastener with external shroud retainer
US10816028B2 (en) 2016-02-16 2020-10-27 Mcgard Llc Method of forming high security fastener with internal shroud buckled retainer
US10989245B2 (en) 2016-02-16 2021-04-27 Mcgard Llc High security fastener with buckled shroud retainer
US11339821B2 (en) 2016-02-16 2022-05-24 Mcgard Llc High security fastener with external shroud retainer
WO2019079178A1 (fr) 2017-10-16 2019-04-25 Mcgard Llc Élément de fixation de haute sécurité à pièces multiples

Also Published As

Publication number Publication date
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