WO1995029344A1 - Fixation par boulon filete - Google Patents

Fixation par boulon filete Download PDF

Info

Publication number
WO1995029344A1
WO1995029344A1 PCT/SE1995/000465 SE9500465W WO9529344A1 WO 1995029344 A1 WO1995029344 A1 WO 1995029344A1 SE 9500465 W SE9500465 W SE 9500465W WO 9529344 A1 WO9529344 A1 WO 9529344A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
cavity
threaded shank
shank
threaded
Prior art date
Application number
PCT/SE1995/000465
Other languages
English (en)
Inventor
Sven-Erik Svensson
Original Assignee
Svensson Sven Erik
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 Svensson Sven Erik filed Critical Svensson Sven Erik
Priority to AU24231/95A priority Critical patent/AU2423195A/en
Publication of WO1995029344A1 publication Critical patent/WO1995029344A1/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

  • the subject invention concerns a screw/bolt joint of the kind defined in the preamble of claim 1, and a threaded furniture knob, a holding or tightening screw or a stud bolt in accordance with the dependent claims 8, 9 and 12, respectively.
  • Threaded knobs in the form of fittings intended e.g. for cupboard doors or drawer fronts that conventionally are made from wood are, when mounted, generally screwed all the way through the material of the door/drawer front and are secured by means of a nut on the reverse side or back of the material.
  • DE-GM 74 13 632 is known a pin joint intended for furniture, according to which publication a retainer pin, which is secured in the furniture in the internal hole of a clamping bushing, attached to the furniture, is retained in position by means of barbs.
  • the holding force of the clamping bushing is, however, also in this case unsatis ⁇ factory in the long run as it is based essentially only on the holding force of the engagement of the threads.
  • the screw/bolt joint is primarily characterized in that the threaded shank is formed with a cavity which opens towards the free shank end and with at least one longitudinal axial slit which extends towards the free shank end and through the shank into the cavity, and in that a spreader/expander member supported against the bottom of the hole or against an abutment shoulder is arranged, upon screwing of said screw fastener element into said hole, to be forced into the cavity at the free end of the shreaded shank, whereby the member expands the threaded shank in such a manner that the external threads on the threaded shank are pressed outwards against the wall of the hole, essentially at right angles to the direction of introduction of said screw fastener element.
  • the dimensions of the threaded shank in relation to the blind hole cause no problems since the expansion of the threaded shank in a simple manner compensates for any existing manufacturing tolerances.
  • the blind hole alternatively, the through-hole or open-ended hole formed with an abutment shoulder in said furniture material, may be internally tapped, particularly when the furniture material is comparatively hard. When the furniture material is somewhat softer, such as wood, the threaded shank itself is able to cut the opposite threads in the blind hole wall.
  • the latter preferably is formed with a plurality of longitudinal/ axial slits around its periphery.
  • the cavity is essentially cylindrical.
  • the expander member is con ⁇ figured to expand the threaded shank progressivly more and more as its depth of penetration into the cavity increases.
  • the cavity preferably is of conical configuration, widening towards the free end of the threaded shank. If, at the same time, the expander member has a conical shape, large mutual contacting surfaces are formed between the cavity wall and the expander member, generating comparatively large expansion forces requiring comparatively small torque to screw the fastener element in position.
  • the expander member is shaped like a cone or has a frustro-conical shape the smaller diameter of which is smaller than the cavity diameter at the free threaded- shank end and the largest diameter of which exceeds the same cavity diameter, advantageously a large part (length) of the expander member consequently is made use of for the expansion of the threaded shank.
  • the cone angle is between 5° and 25°, preferably approximately 12°.
  • the cone angle preferably is chosen in dependence of the frictional characteristics of the co-operating surfaces of the material. Some form of self-restricting effect could sometimes perhaps be desirable.
  • grip means may be provided at the expander member base, said means exerting a gripping force on the bottom of the blind hole or on said abutment shoulder in the open-ended through- hole, respectively. This may contribute to a more convenient dismantling of the screw/bolt joint.
  • the expander member could be formed integrally with the domed nut so as to form one single component.
  • a key grip area or the like preferably immediately above the threaded section thereof in order to allow the stud bolt to be tightened or unscrewed from its position by means of some suitable tool. In the absence of such a grip area it would also be possible to screw the stud bolt in position with the aid of domed nut.
  • the cavity as well as said axial slits could extend along the entire length of the threaded shank. In most embodiments it is, however, sufficient that the cavity and the axial slits are formed only along the end section of the threaded shank.
  • Fig. 1 in a partly cut explosive view shows a screw joint wherein the screw fastener element is in the form of a threaded knob intended for furniture, such as cupboard doors or drawer fronts;
  • Fig. la is a sectional view according from Fig. 1;
  • Fig. 2 illustrates the screw joint in accordance with Fig. 1 in a mounted position;
  • Fig. 3 illustrates a holding or tightening screw in an unmounted position
  • Fig. 4 illustrates a stud bolt in an unmounted position
  • Figs. 5-8 are a series of figures with suggested applications of the screw/bolt joint in accordance with the invention in different applications, the various sequencies of the mounting steps partly being illustrated.
  • a screw joint S in accordance with Figs. 1 and la comprises a screw fastener element E in the form of a threaded knob 1 to be used in pieces of furniture.
  • the knob when mounted, is to act as a fitting in a piece of furniture W, such as e.g. a cupboard door or drawer front by means of which the door or front may be opened.
  • An expander member Z forms part of the screw joint S.
  • the piece of furniture W is formed with a blind hole 13 into which internal threads 14 may (but do not have to) be made in advance.
  • the blind hole 13 has a bottom 15.
  • the piece of furniture W may be provided with a through-hole or open-ended hole formed with an abutment shoulder, which is produced in a two-step drilling operation and which in this case is used to support the expander member Z.
  • Adjacent its manipulat- ing head 1 the screw-fastener element E Adjacent its manipulat- ing head 1 the screw-fastener element E has an abutment flange 2 with a flat rear face 3. From the rear face 3 extends a threaded shank 4 formed with external threads 5.
  • the threaded shank 4 encloses a cavity 6 which is open toward the free end 7 on the threaded shank 4 and which is provided with at least one longitudinal/axial slit 8.
  • the embodiment in Fig. la as shown is formed with several, in this case four, axial slits 8 of this kind, which are distributed uniformly around the periphery of the threaded shank 4.
  • the cavity 6 may have an essentially cylindrical con ⁇ figuration. However, in accordance with the embodiment illustrated it is conical in such a manner that it widens towards the free end 7 of the threaded shank 4.
  • the expander member Z is of a frustro-conical configuration 9, one 10 of its end having a smaller diameter and one end 11 a larger diameter.
  • the area of end 10 is smaller than the mouth area of the cavity at the free end 7 of the threaded shank 4.
  • the area of end 11 is larger than or at least as large as the mouth area of the cavity 6 at the free end 7 of the threaded shank 4.
  • Said frustro-conically con ⁇ figured member 9 is essentially preferably as long as the cavity 6.
  • the cone angle a of the expander plug 8 may correspond to the cone angle of the cavity 6.
  • gripping or holding means 12 may be .provided, gripping into the bottom face 15 of the hole 13.
  • the depth of the blind hole 13 preferably is adjusted to the length of the threaded shank 4 in such a manner that as seen in Fig. 2 the reverse side or back 3 will lie flush against the outer face 16 on the piece of furniture W when the screw fastener element E has achieved a sufficiently secure anchorage in the blind hole 13.
  • the expander plug Z is previously positioned inside the cavity 6, in which initial position it cannot to any extent or not at all expand the threaded shank 4.
  • the expander plug Z will, during the continued advancement of the screw fastener element 1 down into the bottom hole 13, penetrate to a corresponding degree deeper and deeper into the cavity 6 and in doing so forcing/spreading-out or expanding the threaded shank 4 transversely (essentially at right angles to the direction of insertion of the threaded knob 1) so that the external threads 5 will be pressed outwards, against the wall of the hole 13. It is likewise possible to screw the threaded knob sufficiently far into the hole to allow a small space to remain between the back 3 of the knob 1 and the outer face 16 of the piece of furniture W.
  • Fig. 2 illustrates a screw joint in its complete, mounted position.
  • the expansion of the threaded shank 4 could for instance extend all the way up to the mouth of the bottom hole 13 on the external face 16 on the piece of furniture W.
  • Fig. 3 illustrates a holding or tightening screw joint consisting on one hand of a screw or bolt E cora- prising a shank 17, a key grip head 18 and an externally threaded section 4, and on the other a domed nut H.
  • An expander member Z is supported against the bottom 15 in a blind hole 13 of the domed nut H.
  • the expander member Z is formed intergrally with, i.e. formed in one piece with, the domed nut H.
  • the expander member Z could be a separate component which prior to the mounting of the holding or tightening screw joint is positioned freely inside the cavity 6 in the threaded shank 4 of the screw/bolt E whereby it will receive its support in abutment against the bottom 15 in the hole 13 only when being screwed in position therein and upon continued screwing of the screw E it will perform its function, i.e. by expanding the threaded shank 4 on the screw against the internal threads of the blind hole 13 in the domed nut H.
  • the screw fastener element E is a stud bolt 21 comprising a threaded section 22 close to one of its ends 23 which end 23 preferably has a key grip portion 24 for engagement with a suitable torsional tool.
  • a threaded shank 4 is provided at the opposite end 7 of the stud bolt 21 .
  • An intermediate cylindrical section of the stud bolt has been designated by reference 25. Together with or in ⁇ stead of the key grip portion 24 a key grip portion 24' could be arranged on the cylindrical section 25 of the stud bolt.
  • the blind hole 13 is formed with internal threads 14 and encloses the expander member Z which may be secured in the area 20 of the bottom 15 of the hole 13. It may also be possible to position the expander member Z, in this case in the shape of a separate plug, freely inside the cavity 6 in the threaded shank 4 when the stud bolt is to be mounted.
  • Figs. 5a-5c are shown three sequences of suggested applications of the invention in a stud bolt E to be mounted in a reception hole 13 in e.g. an engine block W (see also fig. 4).
  • the intended use of this bolt is e.g. when the internal threads of the hole 13 in the engine block has been damaged.
  • the application of the invention to mount the bolt is in this case very simple as there is no need to produce new threads.
  • the bolt is simply pushed down into the hole 13 together with the expander/cone plug Z, see fig. 5b.
  • the bolt is thereafter tightened with aid of the key grip means 24' until it is anchored in a secured position, see Fig. 5c.
  • the stud bolt could be very easily dismounted whenever desired.
  • Figs. 6a-6c show three sequences of a suggested application of the invention in connection with a bolt E to be mounted for instance in concrete W (such as floors, walls).
  • a bolt E to be mounted for instance in concrete W (such as floors, walls).
  • Several holes may for instance be drilled into a floor in order to secure an object 0, such as pallet stands, machinery, and the like in a machine shop.
  • the object is placed above the holes, bolts are carried down into the holes together with their associated expander/- cone plugs Z in accordance with Fig. 6b.
  • the bolts are then tightened with the aid of the key grip means 24 on each bolt until the bolts are secured, see Fig. 6c.
  • Figs. 7a-7c show three sequences of suggested appli- cation of the invention in connection with a bolt E to mount an object 0 to a material W behind. Together with the expander/cone plug Z the bolt E is screwed into an aperture 13 in the material W, see Fig. 7b. The bolt is tightened until the plug grips, see Fig. 7c.
  • the greatest advantage of this application is that a bolt joint free of vibrational disturbances is obtained without the need to use any thread securing locking arrangements, such as LOCKTITE (registered trademark) or the like that may be detrimental to the health.
  • Figs. 8a-8c illustrate an application of the invention with the aid of a dismantable double expander E intended for mounting e.g.
  • a wooden knob 1 on a kitchen cupboard door (Fig. 8a) and for mounting an object 0 on material W behind with the aid of domed nut H.
  • a blind hole is drilled into the cupboard door and a blind hole 13' in the wooden knob 1.
  • the double expander E is then mounted together with two conical plugs Zl och Z2.
  • the knob 1 is then pressed against the door while at the same time it lies flush with the door front.
  • the domed nut H is mounted in a similar manner, see Figs. 8b and 8c. In both cases in accordance to Fig.
  • the cone angle of the expander member Z generally preferably lies in the area of 5°-25° and preferably amounts to approximately 12°.
  • the expander member Z could be made from the same material as the screw fastener element E.
  • the choice of material with respect to the discrete components in the screw joint in accordance with the subject invention offers a large number of alternative possibilities.
  • the threaded knob and/or expander plug preferably are made from a wooden or plastic material.
  • the cavity 6 could with advantage, if not exclusively so, be given some non-cylindrical configuration, for instance a square cross-sectional shape.
  • the expander member Z preferably is not either rotationally symmetrical but is formed with a cross-sectional configuration corresponding to that of cavity 6.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Dowels (AREA)

Abstract

L'invention porte sur une fixation par boulon fileté (E) dont l'élément de fixation est un boulon dont la tige est filetée extérieurement et qui se visse dans un trou aveugle ou dans un trou pourvu d'un épaulement formant butée; elle se caractérise: (a) en ce que la tige (4) comporte une cavité (6) s'ouvrant vers l'extrémité libre et au moins une fente (8) traversante longitudinale et axiale pratiquée le long de ladite cavité (6) du côté de l'extrémité libre; et (b) en ce qu'un élément d'expansion/dilatation (Z) est conçu, alors qu'il bute contre le fond (5) du trou (13) ou contre l'épaulement formant butée et que lorsqu'on visse le boulon fileté (E) dans ledit trou (13) pour le faire avancer dans la cavité (6), pour dilater la tige filetée de manière à ce que ses filets extérieurs (5) viennent presser contre les parois du trou (13), sensiblement perpendiculairement à la direction d'introduction dudit élément de fixation.
PCT/SE1995/000465 1994-04-27 1995-04-27 Fixation par boulon filete WO1995029344A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24231/95A AU2423195A (en) 1994-04-27 1995-04-27 Screw/bolt joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9401432-1 1994-04-27
SE9401432A SE9401432D0 (sv) 1994-04-27 1994-04-27 Skruv-/bultförband

Publications (1)

Publication Number Publication Date
WO1995029344A1 true WO1995029344A1 (fr) 1995-11-02

Family

ID=20393798

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000465 WO1995029344A1 (fr) 1994-04-27 1995-04-27 Fixation par boulon filete

Country Status (3)

Country Link
AU (1) AU2423195A (fr)
SE (1) SE9401432D0 (fr)
WO (1) WO1995029344A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025268A1 (de) * 2006-05-31 2007-12-06 Ccg-Concept Consulting Gmbh Spreizanker
EP2481938A3 (fr) * 2011-01-28 2017-05-10 HILTI Aktiengesellschaft Vis à béton et procédé d'ancrage d'une vis à béton dans un sous-sol
CN108869516A (zh) * 2018-08-28 2018-11-23 美佳德科技（无锡）有限公司 组合式防松螺栓

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115030948A (zh) * 2022-04-29 2022-09-09 绍兴宝旌复合材料有限公司 一种可拆卸双面沉头紧固件及其连接方法和应用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1113215A (fr) * 1954-10-26 1956-03-26 Clou ou vis à coincement interne
FR2034598A1 (fr) * 1969-03-03 1970-12-11 Wada Takeji

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1113215A (fr) * 1954-10-26 1956-03-26 Clou ou vis à coincement interne
FR2034598A1 (fr) * 1969-03-03 1970-12-11 Wada Takeji

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025268A1 (de) * 2006-05-31 2007-12-06 Ccg-Concept Consulting Gmbh Spreizanker
EP2481938A3 (fr) * 2011-01-28 2017-05-10 HILTI Aktiengesellschaft Vis à béton et procédé d'ancrage d'une vis à béton dans un sous-sol
CN108869516A (zh) * 2018-08-28 2018-11-23 美佳德科技（无锡）有限公司 组合式防松螺栓

Also Published As

Publication number Publication date
SE9401432D0 (sv) 1994-04-27
AU2423195A (en) 1995-11-16

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