WO1995004229A1 - Ameliorations concernant des dispositifs de fixation - Google Patents

Ameliorations concernant des dispositifs de fixation Download PDF

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Publication number
WO1995004229A1
WO1995004229A1 PCT/GB1994/001607 GB9401607W WO9504229A1 WO 1995004229 A1 WO1995004229 A1 WO 1995004229A1 GB 9401607 W GB9401607 W GB 9401607W WO 9504229 A1 WO9504229 A1 WO 9504229A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
fixing means
means according
bolt
actuator
Prior art date
Application number
PCT/GB1994/001607
Other languages
English (en)
Inventor
Andrew Chadburn
Original Assignee
Andrew Chadburn
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 Andrew Chadburn filed Critical Andrew Chadburn
Priority to GB9601050A priority Critical patent/GB2295434A/en
Priority to AU72330/94A priority patent/AU7233094A/en
Publication of WO1995004229A1 publication Critical patent/WO1995004229A1/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
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/023—Locking of screws, bolts or nuts in which the locking takes place after screwing down by driving a conic or wedge-shaped expander through the threaded element

Definitions

  • This invention concerns fixing devices of a type which are positively locked in position, and in particular although not exclusively to threaded members which are lockable or self- locking for use on machinery which is constantly subjected to vibration.
  • the threaded member is a bolt however any threaded members used for fixing, including the conventional bolts used with nuts as well as studs, which have no bolt head, and other screwing engager devices or considered to be within the field of the invention.
  • An object of the present invention is the provision of a reliable locking bolt which is both easy and quick to install.
  • a further object of the invention is the provision of a lockable bolt which is also releasable simply and without excessive effort.
  • a fixing means comprising an externally threaded member for interengagement with an internally threaded counterpart, and a locking insert, said member having two ends, wherein one end is split and receives the insert such that when said member is engaged with its counterpart, said member may be locked in place by forcible movement of the insert axially into the split end to cause the spit end to splay apart.
  • the insert is preferably received within a coaxial recess in the split end so that the split end splays out radially.
  • the bolt preferably comprises a recess which is of an outline at least partially matching that of the the locking insert.
  • the said recess is preferably of substantially conical or frustoconical form.
  • the insert is preferably of substantially conical or frustoconical form.
  • the said split end of said member is preferably slotted to form a collet arrangement, having resilient fingers extending axially at the split end.
  • the locking insert may be embodied on an end cap nut, with the insert located on the inner surface of the end of the nut such that when the nut is screwed onto the end of said member bolt, the insert expands the end of said member to automatically lock the nut in place.
  • said member is a bolt and the insert is adapted to engage the receiving split end of the bolt by frictional resistance only.
  • the base of the insert contacts the base of the blank hole and is thrust upwards into the bolt end, thereby splaying the end of the bolt and pushing the threads of the bolt end into locking engagement with the threads of the hole.
  • the insert may be adjustable in length in accordance with the length of the blank hole, the insert comprising spaced waisted portions along its length at which points the insert may be broken or cut shorter as desired.
  • said member accomodates an actuator engagingly or otherwise attached to the insert, the actuator having a head at one end and an externally threaded portion adjacent its other end, the head allowing the actuator to be rotated in order to cause axial displacement of the insert portion within the split end of said member, to effect locking or release thereof as desired.
  • the actuator head may be a cap head or an Allan key head.
  • the insert is an internally threaded counterpart of the threaded actuator and said member has a bore extending from the split end of said member to the other end opposed to that of the split end, the bore being sized to accomodate the threaded actuator with its head adjacent said other end, so that the insert may be axially displaced by manipulating the actuator from said other end of said member.
  • the said other end may be recessed in order to accommodate the actuotor head.
  • said member has an internally threaded bore extending from its split end axially of the bore threadingly accommodating the actuator with the actuator head adjacent the split end of said member, so that said member may be locked or released by manipulation of the actuator from adjacent the split end of the bolt to cause axial movement of the insert into or out of the split end.
  • This embodiment is of particular use when the bolt is a stud, i.e. a threaded bar, which has be welded in place at one end so that that end is no longer accessible for locking and/or releasing a nut screwed onto the stud.
  • the insert may be recessed to accommodate the actuator head.
  • Fig. 1 shows in vertical cross section a self-locking bolt and locking device according to the invention for use in a blank hole
  • Fig. 1A shows in end view the bolt shown in Fig. 1;
  • Fig. 2 is a sectional view of a further embodiment of the invention including a locking cap nut
  • Fig. 3. shows in side view a further embodiment of the present invention showing a permanently locking bolt
  • Figs. 4 and 5 are side views of releasable lockable bolts according to further embodiments of the invention.
  • the device consists of a bolt 2 and a locking means 4.
  • the bolt is generally of conventional form, however at the base of the threaded stem 6 there are provided a central frustoconical socket 8 and a diametrical slit 10.
  • the locking means 4 consists of a number of frustoconical plugs 12 connected linearly via waisted portions 14. Both bolt 2 and locking means 4 are made of metal.
  • the embodiment of the invention shown in these figures, 1 and 1A is particularly suited for use in conjunction with a blank hole, that is to say an internally threaded hole of which the end is blocked off.
  • a blank hole that is to say an internally threaded hole of which the end is blocked off.
  • the uppermost plug 12 of the locking means 4 is lightly inserted into the socket 8 so that the locking means is held therein without causing the split end portions 16 of the bolt to splay outwards, and the bolt is screwed into the blank hole in the usual manner.
  • the base 18 of the locking means approaches the end of the hole, and in fact eventually contacts the end of the hole.
  • the locking means 4 is prevented from further downward motion due to its contact with the end of the hole, and the uppermost plug 12 is thrust upwards into the socket 8, causing the split end portions 16 to splay outwards.
  • the effect of this splaying is that the threads of the bolt and the hole interengage very strongly at the end of the stem 6, making it extremely difficult for the bolt to be removed subsequently.
  • the possibility of spontaneous loosening of the bolt from the hole is very highly reduced.
  • the end of the bolt need not be slotted in the fashion indicated, since in fact there can be provided any number, one or more, radial slots in the end of the bolt or any other construction whereby the expanding effect is achieved. In fact, there may be no slots provided but instead lines of weakness along which the bolt will split under the influence of the uppermost plug 12, however such unregulated splitting is not desirable.
  • the locking means 4 has a series of plugs 12 connected by waisted portions 14 so that a length of locking means can be broken off according to the length of the blanked hole, and in fact only the uppermost plug 12 need be of a form corresponding to that of the conical socket 8, since the locking means can be adjusted in length by breaking off portions 12 from the end opposite the uppermost plug 12.
  • Fig 2 illustrates a further embodiment of self-lockable bolt according to the invention, and the bolt 20 may be identical to the previously described bolt 2.
  • the locking device in this case is a end cap nut 22 which is internally threaded and has a frustoconical plug 24 projecting from the centre of the inner surface of the cap end 26.
  • the plug is thrust upwards into the socket 28 thus forcing the split end portions 30 of the bolt 22 apart and effectively locking the nut onto the end of the bolt 20.
  • a blank hole might be provided with a projecting plug at its end which will cooperate with a suitably sized bolt having socket and slot formations on its end to similarly lock the bolt in the hole as it is screwed into place.
  • a permanently lockable bolt 32 there is shown a permanently lockable bolt 32.
  • the bolt is configured similarly to that shown in Figs 1 and 1A, and here the insert is simply a frustoconical metal insert 34.
  • the insert 34 may by simply thrust into the correspondingly shaped frustoconical recess 36.
  • Embodiments of releasable lockable bolts are shown in Figs 4 and 5.
  • the first such bolt shown in Fig 4, has a bore 40 running along its axis, and a correspondingly sized actuating bolt (not shown) which is received within the bore such that the threaded end of the actuating bolt extends into the locking recess 42 at the locking end 48 of the lockable bolt 38.
  • the insert 44 has an internally threaded axial bore 46 which engages with the end of the actuating bolt such that by turning the actuating bolt relative the insert, by means of the cap head situated in the bolt head 50, the insert can be forcibly withdrawn into the recess to splay the end 48 of the lockable bolt 38 and lock the bolt onto a nut (not shown) which is threaded onto the end of the bolt.
  • the bolt head 50 is recessed in order to accommodate the cap head of the actuating bolt.
  • the actuating bolt In order to release the bolt from its locked state, the actuating bolt need simply be rotated by means of its Allen Key so as to allow the insert out of forced engagement with the inside of the locking recess 42, thereby returning the bolt end 48 to its initial unflexed condition and allowing the nut to be unscrewed from the end of the bolt.
  • a second lockable bolt 52 of Fig. 5 may be considered useful.
  • This bolt has an internally threaded blind bore 54 extending from the locking end 56 of the bolt 52.
  • Bore 54 is threaded in order to engagingly accomodate an actuating bolt (once again not shown) which is additionally provided with a frustoconical portion 58, which may have a stepped bore 60 running axially along it in order to accommodate the actuating bolt and its head or cap, or may in fact be integrally built into the actuating bolt.
  • the locking and releasing action may be effected from the locking end of the releaseable lockable bolt 52.
  • the bolt 52 could be replaced with a threaded bar having no head but rather being for example welded in place at one end at a bolting point. The other end would then be lockable/releasable as described in relation to bolt 52. Indeed, in some applications it may be deemed desirable to provide a threaded bar having both ends which are formed to be lockable according to any combinations of the locking arrangements provided by the invention.
  • the bolts described above may be manufactured by various methods, including lathework cold forging, vertical drilling or hole punching.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)

Abstract

L'invention concerne un boulon de fixation (2) qui peut être verrouillé en place par une pièce d'insertion de verrouillage (4) qui vient se placer dans l'extrémité fendue (8) du boulon, ou plus généralement de tout autre élément fileté. Lorsque le boulon (2) est en place avec un écrou ou similaire disposé à l'extrémité libre du boulon et que l'on souhait effectuer le verrouillage, la pièce d'insertion (4) est forcée dans la partie fendue pour en provoquer l'écartement. Dans une forme d'exécution préférée, le boulon peut être verrouillé d'une manière réversible et un écrou d'extrémité (22) est disposé dans l'alésage axial du boulon de fixation. L'écrou d'extrémité porte la pièce d'insertion et la rotation de l'écrou d'extrémité provoque le mouvement axial de la pièce d'insertion par rapport à l'extrémité du boulon de fixation, pour verrouiller ou libérer le boulon.
PCT/GB1994/001607 1993-07-27 1994-07-26 Ameliorations concernant des dispositifs de fixation WO1995004229A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9601050A GB2295434A (en) 1993-07-27 1994-07-26 Improvements relating to fixing devices
AU72330/94A AU7233094A (en) 1993-07-27 1994-07-26 Improvements relating to fixing devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939315503A GB9315503D0 (en) 1993-07-27 1993-07-27 Improvements relating to fixing bolts
GB9315503.4 1993-07-27

Publications (1)

Publication Number Publication Date
WO1995004229A1 true WO1995004229A1 (fr) 1995-02-09

Family

ID=10739490

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001607 WO1995004229A1 (fr) 1993-07-27 1994-07-26 Ameliorations concernant des dispositifs de fixation

Country Status (3)

Country Link
AU (1) AU7233094A (fr)
GB (1) GB9315503D0 (fr)
WO (1) WO1995004229A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE283525C (fr) *
GB124878A (en) * 1918-04-02 1919-04-02 Kingsland Res Syndicate Ltd Improvements in or relating to Nuts and Bolts.
DE362413C (de) * 1914-03-15 1923-01-27 Heinrich Eigener Schraubensicherung
FR584119A (fr) * 1924-07-15 1925-01-30 Vis à téton mobile assurant un blocage plus rationnel en supprimant l'effet nuisible du cône d'entrée généralement donné aux premiers filets
DE444037C (de) * 1924-02-12 1927-05-10 Karl Schubert Schraubensicherung
US3042094A (en) * 1959-09-30 1962-07-03 Elsa I Liljeberg Locking screw with expanding means at each end
US3378054A (en) * 1967-02-27 1968-04-16 Rudolph M. Vaughn Rapid threading fastener assembly
FR2058607A5 (fr) * 1969-09-16 1971-05-28 Mathevot Michel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE283525C (fr) *
DE362413C (de) * 1914-03-15 1923-01-27 Heinrich Eigener Schraubensicherung
GB124878A (en) * 1918-04-02 1919-04-02 Kingsland Res Syndicate Ltd Improvements in or relating to Nuts and Bolts.
DE444037C (de) * 1924-02-12 1927-05-10 Karl Schubert Schraubensicherung
FR584119A (fr) * 1924-07-15 1925-01-30 Vis à téton mobile assurant un blocage plus rationnel en supprimant l'effet nuisible du cône d'entrée généralement donné aux premiers filets
US3042094A (en) * 1959-09-30 1962-07-03 Elsa I Liljeberg Locking screw with expanding means at each end
US3378054A (en) * 1967-02-27 1968-04-16 Rudolph M. Vaughn Rapid threading fastener assembly
FR2058607A5 (fr) * 1969-09-16 1971-05-28 Mathevot Michel

Also Published As

Publication number Publication date
AU7233094A (en) 1995-02-28
GB9315503D0 (en) 1993-09-08

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