WO2000032946A1 - Wedge anchor for concrete - Google Patents
Wedge anchor for concrete Download PDFInfo
- Publication number
- WO2000032946A1 WO2000032946A1 PCT/CA1999/001129 CA9901129W WO0032946A1 WO 2000032946 A1 WO2000032946 A1 WO 2000032946A1 CA 9901129 W CA9901129 W CA 9901129W WO 0032946 A1 WO0032946 A1 WO 0032946A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- expansion
- hole
- expander
- leading
- anchor
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000003780 insertion Methods 0.000 claims abstract description 6
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 230000013011 mating Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000009987 spinning Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000000576 coating method Methods 0.000 description 2
- -1 abrasive Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- 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
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/065—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting the screw, nail or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
Definitions
- the present invention relates to fasteners and, more particularly, to expandable fasteners for mounting to concrete structures, and the like.
- Expandable anchors of many different types are already known. More particularly, expandable anchors have been developed for insertion into a hole formed in a support structure such that a cylindrical expansion sleeve of the anchor may be selectively expanded into frictional contact with the inside peripheral surface of the hole such that the anchor becomes frictionally anchored in the support structure.
- the expandable anchor includes an elongated expander member having a threaded first end and a flared second end opposite the first end with a cylindrical surface extending between the first and second ends around which there is provided the aforementioned expansion sleeve.
- the threaded first end is like a headless screw and extends outwardly of the support structure once the expandable anchor is positioned in the hole thereof.
- a nut threaded on the visible part of the threaded first end may be used as an actuating mechanism with an object to be secured to the support structure being typically located between the nut and the support structure as the threaded first end of the expandable anchor extends through this object.
- By rotating the nut it engages the outer surface of the object and thus bears upon it such as to pull the expander member in an outward direction.
- the expansion sleeve As the expansion sleeve is already sufficiently frictionally engaged with the inside surface of the hole, when the expandable anchor is pulled by the rotation of the nut, the expansion sleeve stays substantially stationary in the hole and thus, as the expander member is pulled out of the hole, the flared second end of the expander member causes the cylindrical expansion sleeve to expand radially outwardly thereby increasing a friction between the expansion sleeve and the hole and thus further securing the expandable anchor therein.
- the outside diameter of the expansion sleeve must be similar to, even slightly greater than, the inside diameter of the hole in order to ensure an initial frictional contact therebetween which will then allow the expansion sleeve to remain still in the hole while the expander member is pulled outwardly thereof and thus allow the expansion sleeve to be expanded by the flared end of the expander member.
- This diameter of the expander member at rest, results in that the expandable anchor when initially inserted in the hole must be inconveniently driven with significant force therein as the expansion sleeve is already frictionally engaged with the inside wall of the hole.
- the flared end then acts as a wedge to expand the expansion sleeve into greater frictional contact with the inside of the hole.
- United States Patent No. 2,647,431 issued on August 4, 1953 to Lewis discloses an expansion bolt comprising a hollow shell having a leading end adapted to be expanded by a wedge into frictional contact with the peripheral wall of a hole.
- Resilient spurs in some cases as part of a separate bail, are provided at opposite trailing ends of the shell, i.e. the end which is nearest to the opening of the hole, in order to engage the wall of the hole and prevent initial rotation of the shell relative to the hole until the shell frictionally engages the wall.
- 3,620,120, 5,028,188 and 5,344,257 each describes having a resilient shell for facilitating the introduction of the expandable anchor within a hole while providing sufficient holding pressure to prevent the shell and associated wedge member from spinning in the hole as a torque is applied to a bolt for axially displacing the wedge member such as to radially expand the shell.
- United States Patents No. 2,783,673 issued on March 5, 1957 to Lewis et al. and No. 5,352,066 issued on October 4, 1994 to Schaeffer et al. also both disclose an expandable shell for facilitating the installation thereof within a hole.
- the leading end of the shell may be expanded at an angle with respect to the central axis of the hole.
- undercut wedge anchors wherein the hole formed in the support structure is enlarged with a tool at a distance from the visible opening of the hole such that the expandable undercut wedge anchor may thereafter be inserted in the hole until its expansion sleeve becomes located behind a shoulder defined at the junction of the enlarged area and the remainder of the hole. Once expanded, the expansion sleeve may abut this shoulder and thus retain the anchor in position in the support structure.
- an expansion wedge anchor for insertion in a hole delimited by a wall, comprising an expander means and an expansion means, said expansion means being provided at a leading end of said expander means, said expander means comprising flaring means, said expansion means being expandable at a trailing end thereof and being adapted to engage the wall of the hole when said expander means is positioned in the hole, wherein upon longitudinal withdrawal of said expander means from the hole, said expander means displaces longitudinally relative to said expansion means with said flaring means thereof gradually causing said trailing end of said expansion means to expand, whereby a trailing edge of said expansion means engages the wall of the hole.
- said trailing end is adapted, when expanded by said flaring means, to extend at an angle with respect to a longitudinal axis of said expander means.
- a method of setting an expansion wedge anchor in a hole delimited by a wall comprising the steps of: (a) providing an expander member and an expansion member; and (b) displacing said expander member such as to cause a trailing end of said expansion member to engage the wall of the hole.
- step (b) said trailing end is expanded such as to extend at an angle with respect to a longitudinal axis of said expander member.
- Figs. 1A and IB are longitudinal cross-sectional views of a first variant of a non-slip wedge anchor in accordance with the present invention shown respectively in at rest and installed positions thereof;
- Fig. 1C is a bottom plan view of the anchor of Fig. 1A;
- Figs. 2 A and 2B are longitudinal cross-sectional views of a second variant of a non-slip wedge anchor in accordance with the present invention shown respectively in at rest and assembled positions thereof;
- Figs. 3A and 3B are respectively elevational and bottom plan views of an expander member of the anchor of Figs. 2A and 2B;
- Figs. 3C, 3D and 3E are respectively front elevational, side elevational and bottom plan views of an expansion member of the anchor of Figs. 2A and 2B;
- Figs. 4A and 4B are longitudinal cross-sectional views of a third variant of a non-slip wedge anchor in accordance with the present invention shown respectively in at rest and assembled positions thereof;
- Figs. 5A and 5B are respectively elevational and bottom plan views of an expander member of the anchor of Figs. 4A and 4B;
- Figs. 5C, 5D and 5E are respectively front elevational, side elevational and bottom plan views of an expansion member of the anchor of Figs. 4A and 4B;
- Figs. 6 A and 6B are longitudinal cross-sectional views of a fourth variant of a non-slip wedge anchor in accordance with the present invention shown respectively in at rest and assembled positions thereof;
- Figs. 7 A and 7B are respectively elevational and bottom plan views of an expander member of the anchor of Figs. 6A and 6B;
- Figs. 7C, 7D and 7E are respectively front elevational, side elevational and bottom plan views of an expansion member of the anchor of Figs. 6 A and 6B;
- Figs. 8A and 8B are longitudinal cross-sectional views of a first variant of an undercut wedge anchor in accordance with the present invention shown respectively in first and second positions thereof in a support structure;
- Figs. 9 A to 9D are respectively front elevational, side elevational, bottom plan and top plan views of an expander member of the undercut wedge anchor of Figs. 8 A and 8B;
- Figs. 9E to 9G are respectively front elevational, side elevational and bottom plan views of an expansion member of the undercut wedge anchor Figs. 8 A and 8B;
- Figs. 10A to 10D are respectively front elevational, side elevational, bottom plan and top plan views of a second variant of an undercut wedge anchor in accordance with the present invention.
- Figs. 11A to 11C are respectively front elevational, side elevational and top plan views of a third variant of an undercut wedge anchor in accordance with the present invention.
- Figs. 12A to 12C are respectively front elevational, side elevational and bottom plan views of a fourth variant of an undercut wedge anchor in accordance with present invention.
- Figs. 13A to 13C are respectively front elevational, side elevational and bottom plan views of a fifth variant of an undercut wedge anchor in accordance with present invention.
- Fig. 14A is a front elevational view of a spiral wedge anchor also in accordance with the present invention.
- Fig. 14B is a variant of the spiral wedge anchor of Fig. 14A
- Fig. 14C is a top plan view of either anchor of Figs. 14A and 14B;
- Fig. 15 is a vertical cross sectional view showing the spiral anchor wedge of Fig. 14A in an expanded position within a hole defined in a support structure such that the anchor retains an object to this support structure.
- this new non-slip expansion anchor concept is to provide an improved anchor design capable of achieving superior performance over convention al type expansion anchors presently offered. Another area to be considered is that of the effect of vibratory loading on the anchor performance. This is relevant considering the anchor is designed to provide minimal relaxation of the anchor assembly after installation. In conventional expansion anchors the bolt tends to loosen after the initial setting torque has been applied and as a result it must be re-tightened to establish the proper clamping load. The positive set between the anchor bolt and clip segments will provide minimal slip or creep once the anchor is set and the load is applied to the anchor.
- Figs. 1A and IB illustrate a non-slip wedge anchor 10 in accordance with the present invention which is shown respectively in at rest and installed positions thereof.
- the anchor 10 is seen from its underside.
- the anchor 10 includes an expander member 12 and an expansion member 14.
- the expander member 12 is designed to be inserted in a hole H defined in a support structure S, such as a concrete element, and comprises a treaded section 16 adapted to extend in the hole H while having a proximal end 18 which extends outside of the hole H such as to be engaged by a threaded female member, such as a nut N, with a washer W being herein shown between the nut N and the support structure S.
- the expander member 12 also includes a flared distal end 20 around which is provided the expansion member 14 which is dimensioned to frictionally engage the walls of the hole.
- the expansion member includes a double-layered, folded over, proximal or trailing end 22 which defines an internal abutment shoulder 24 which can be engaged by an enlarged annular flange 26 provided distally of the flared end 20 of the expander member 12.
- a second wedge anchor 30 in accordance with present invention is illustrated and which comprises an expander member 32 (shown in detail in Figs. 3A and 3B) and an expansion member 34 (shown in detail in Figs. 3C to 3E), or expandable clip.
- the expander member 32 is similar to the expander member of Fig. 1A in that it includes a treaded section 36, having a proximal end 38, a leading flared end 40 and a reduced diameter intermediate cylindrical section 42 therebetween.
- a shoulder 44 is defined at a junction of the intermediate and threaded sections 42 and 36.
- the expansion member 34 comprises a leading support 46, an expandable collar 48 and a leg 50 connecting the support 46 and collar 48 together.
- the collar 48 is split at 52 to allow it to expand, as seen in Fig. 2B, and defines thereat mating tongue and groove elements 54 and 56, respectively.
- the leg 50 of the expansion member 34 is held captive in a groove 58 defined longitudinally in the flared end 40 (see Figs. 3A and 3B) thereby preventing the expansion member 34 from rotating with respect to the expander member 32 and forcing it to work vertically without twisting.
- the rotation of the nut N causes the expander member 32 to displace longitudinally and outwardly along the hole H.
- the collar 48 of the expansion member 34 frictionally engages the walls of the hole H, it remains stationary therein while the groove 58 slides along the leg 50.
- the leg 50 is biased outwardly, i.e. to an open or deployed position, to ensure the initial frictional engagement of the collar 48 with the walls of the hole H.
- the outside surface of the collar 48 is knurled for additional friction.
- cylindrical intermediate section 42 allows the collar 48 to be received in a collapsed position (see Fig. 2A) when the anchor 30 is initially driven in the hole H.
- shoulder 44 prevents the expandable member 34 from moving up on the threaded section 36 of the expander member 32.
- the tongue and groove elements 54 and 56 align the collar 48 at its split 52 to provide a peripheral, 360°-like, gripping of the expandable member 34 into the walls of the hole H.
- the expandable member 34 is also provided on its leg 50 with a reinforcement rib 62 to provide more rigidity to the leg 50.
- the leading support 46 of the expandable member 34 comprises a concave bottom 64 to still give more rigidity to the leg 50.
- a radial flat section land 66 At the very end of the flared section 40 of the expander member 32 is a radial flat section land 66 to allow for maximum interference between the hole H, the expander member 32 and the expansion member 34.
- anchors 70 and 80 are very similar to the anchor 30, except that their respective expansion members 34a and 34b have respectively 2 and 3 legs 50a and 50b, respectively, as opposed to the single leg 50 embodied in the expansion member 34 of anchor 30.
- the multiple splits 52b result in that the collar 48b includes three clip segments.
- the expansion member 34b of anchor 80 defines a pair of rounded radii 82 and 84 to increase the rigidity of the legs 50b.
- the new wedge concept is made up of two components.
- One is a specially formed stud or expander member which is partially threaded at one end.
- Assembled to the bottom end is a multi segment expansion clip or expansion member which is assembled to the flared end of the stud opposite the threaded end.
- the stud (Figs. 7 A and 7B) is made of high strength steel which can be heat treated for heavy duty applications.
- the stud is unique in that it contains a number of features unlike conventional wedge type anchors.
- the stud is comprised of an external thread at one end which has a reduced diameter at the bottom end of the thread which engages the multi segmented clip. The difference in diameter prevents the clip from travelling upward onto the threads of the bolt.
- the end of the bolt opposite to the thread end has a flared section extending outward.
- the end of the flare incorporates several guide segments used to maintain the position of the expansion member as it expands during installation and is also used to prevent rotation of the total clip itself.
- At the very end of the flared section of the bolt is a radial flat section land to allow for maximum interference between the hole, stud and expansion clip.
- the expansion clip (Figs. 7C to 7E) is made of high strength steel and is comprised of three formed segments which are pre-expanded prior to assembly. Each of the segments compresses against the hole in the concrete when driven into the hole providing frictional resistance to axial pullout during installation and after the load is applied.
- Each segment is connected to a formed concave shaped section via a formed leg section.
- Each leg connecting a segment has a strengthening rib and internal radii to add rigidity to the clip assembly.
- Another feature located on each segment is a locking tab which helps control expansion and keep the clip segments in line. This provides for a full 360 degree expansion. A portion of each is knurled to provide additional friction and holding power.
- a nut/washer is assembled to the threaded end of the stud assembly.
- the embedment is determined and measured from directly under the washer to the bottom end of the bolt.
- the anchor is driven into a pre-drilled hole in the concrete. As the anchor is driven into the hole using a hammer, the pre-expanded segments of the clip assembly provide the frictional resistance to resist the axial pullout resulting during the initial setting of the anchor.
- this undercut type anchor concept is to provide a high strength instant holding mechanical type anchor designed to achieve superior pullout performance in concrete while provided a positive lock into the concrete to prevent anchor slip or creep.
- FIGs. 8 A and 8B illustrate an undercut wedge anchor 100 in accordance with the present invention which is shown respectively in first and second positions thereof in a support.
- the undercut anchor 100 consists of two specially formed components, namely a stud or expander member 102 and a clip or expansion member 104, both made of high strength steel to provide the resistance needed to overcome the forces acting as a result of the high installation torque required to set the anchor into the concrete.
- Existing designs consist of more than two assembled components.
- the expander member 102 which is made of high strength steel to resist heavy duty tension and shear applications comprises a threaded section 106, a proximal hex drive element 108 located at the top or beginning of the threaded section as a positive means of providing the spinning or rotational action to the anchor 100 during installation.
- the standard hex element 108 allows the use of a conventional type socket type drive for fast access and easy removal.
- a specially designed stud configuration that provides a means to expand the undercut mechanism (or expansion member 104) which will provide the positive lock between the expander member 102 and the concrete of the support structure S.
- This stud configuration consists of longitudinal opposed first leading and second trailing flared portions 110 and 112, respectively.
- the trailing tapered portion 112 located towards the threaded section 106, provides a means of expanding the undercut mechanism or expansion member 104 which in turn defines the undercut into the concrete.
- a collar 114 which is used to prevent the undercut mechanism or expansion member 104 from moving onto the threaded section 106 of the expander member 102.
- the leading flared portion 110 provides a means of expanding the bottom portion, or distal end, of the expansion member 104, to thus complete the undercut/locking process.
- a specially formed configuration to prevent the expansion member 104 from rotating free of the expander member 102 during the initial undercut action and during the final installation process.
- the multiple function specially designed undercut mechanism /expansion member 104 which is made of high strength steel comprises an expandable collar 116, a leading support 118 and a pair of legs 120, reinforced with ribs 122, connecting the expandable collar 116 and the leading support 118 together.
- the leading support 118 has a formed end 124 at the bottom to reduce friction and serve as a means of providing a way of forcing the expandable collar 116 against the trailing flared portion 112 of the expander member 102.
- the expandable collar 116 is split at 126 to allow it to expand and has at its trailing end a pair of inwardly directed tabs 128 which with the legs 120 engage trailing and leading recesses 130 and 132, respectively, defined in the trailing and leading flared portions 112 and 110.
- the expansion member 104 is held captive by these longitudinal recesses 130 and 132 thereby preventing the expansion member 104 from rotating with respect to the expander member 102 and forcing it to work vertically without twisting.
- the expandable collar 116 defines opposed leading and trailing edges 134 and 136, respectively. Between the flared portions 110 and 112, the expander member 102 defines a cylindrical portion 138 which allows the expandable collar 116 to be received in a collapsed position when the anchor 100 is initially driven in the hole H.
- the anchor 100 is driven into the pre-drilled hole H until it is reaches its bottom (see Fig. 8A).
- a rotary drill with a hex drive socket attached is assembled to the external hex drive element 108.
- the installer forces the expander member 102 down by applying constant downward pressure thereon while it is spinning. Once the expansion member 104 is frictionally engaged to the walls of the hole H, the further downward displacement of the expander member 102 causes the trailing flared section 112 to engage the expansion member 104 and forces the latter to expand radially outward (see Fig.
- the rotation of the expander member 102 resulting from it being connected to the rotary drill causes the expansion member 104 to rotate (as it connected at its tabs 128 and legs 120 to the trailing and leading recesses 130 and 132 of the expander member 102).
- the spinning of the expansion member 104 causes its trailing edge 136 to cut into the support structure S (e.g. of concrete), thus providing the initial undercut action.
- the expander member 102 is set by assembling the nut N and washer W to a trailing end of its threaded section 106. The nut N is rotated until it is hand tight against the flat washer W and flush with the support structure S.
- the nut N As the nut N is tightened to a specified torque, it draws the expander member 32 longitudinally and outwardly out of the hole H. Although the trailing flared portion 112 disengages from the collar 116, the trailing edge 136 of the collar 116 remains set in the undercut (see Fig. 8B) in view of its memory, for instance resulting from the trailing edge 136 having been plastically deformed. As the expandable collar 116 remains stationary by virtue of the positive locking engagement of its trailing edge 136 with the walls of the hole H, the leading flared portion 110 causes the leading end of the collar 116 to expand outwardly (see Fig. 8B).
- the expansion member 104 is prevented from rotating by its legs 120 being laterally confined in the recesses 132 and being thus limited to relative longitudinal displacement therein. It is noted that the expandable collar 116 may be spring loaded or biased outwardly, i.e. to a partly open or deployed position, to ensure the initial frictional engagement thereof with the walls of the hole H.
- the anchor 100 thus provides the undercut needed to maintain the locked position of the installed anchor 100.
- the upper portion of the expansion member 104 also contains a special configuration which includes a formed cutting edge 136 and/or surface to allow it to cut into the concrete and aggregate via the axial rotation provided by the drive tool spinning the expander member 102.
- a special coating e.g. abrasive, diamond coatings
- a series of hardened particles 140 can be applied onto the surface and/or cutting edge 136 of the undercut portion of the expansion member 104.
- the hex drive element 108 can take other forms as long as the expander member 102 can be gripped from outside the hole H and rotated.
- Figs. 10A to 10D, 11 A to 11C, 12A to 12C and 13A to 13C show four variants of the undercut wedge anchor 100 wherein the expansion member 104 of Figs. 9E to 9G has been modified, for instance at its formed end 114 and tabs 128 (with similar adjustments to the trailing recesses 130).
- the expansion of the expansion member results from that at least proximal or trailing edge thereof, i.e. and upper section of the expandable segments thereof, bites into or interferes with the peripheral concrete wall of a receiving hole thereby preventing the assembly from sliding or creeping upwards and cause the bolt to loosen in the hole defined in the concrete structure. This prevents axial removal of the anchor from the hole.
- resistance to axial pullout is improved.
- the resiliency of the expansion member allows the anchor to be easily inserted in the hole while urging the same against the wall of the hole to prevent the expansion member from rotating as a torque is applied to a nut engaged to the bolt.
- the rotation of the nut causes the bolt to move translationally outwardly of the hole and thus causes a flared expander portion of the bolt to move axially into the stationary expansion member to expand the expansion member as per the way described hereinbefore.
- Fig. 6B With respect to the non-slip wedge anchor, this is well illustrated in Fig. 6B, and in the case of the undercut wedge anchor, this is well shown in Fig. 8B.
- the undercut wedge there is a first expansion of the expansion member followed by a rotation of the bolt such that the expanded upper edge of the expansion member cuts into 360° of concrete and thus provides the undercut needed to maintain the locked position of the anchor. More specifically, the first expansion of the expansion member is effected by applying a constant downward pressure on the bolt so as to cause the expansion to move axially over an upper flared portion of the bolt. Once the undercut action has been completed, the expansion member is expanded by drawing a lower flared portion of the bolt into the expansion member via operation of a nut threadably engaged with the threaded end of the bolt, thereby completing the setting of the undercut/expansion mechanism.
- non-slip and undercut wedge anchors resides in the fact that they provide a much stronger grip than that of known friction-based sleeve designs.
- undercut wedge anchor no separate drill bit is required to define the undercut.
- Fig. 14A illustrates a spiral wedge anchor 200 having a stud or expander member 202 defining a spiral and tapered lower end 204 for receiving a resilient coil or expansion member 206 (e.g. made of hard steel) which, in view of the initial frictional engagement of the coil 206 with the wall of the hole H in the support structure S, climbs along the tapers of the lower stud end 204 as the stud 202 is pulled rotatably outwardly of the hole H, whereby the coil 206 is expanded outwardly radially for further contacting the hole H (as seen in Fig. 15), being firmly wedged between the concrete S and the stud 202. An object O can thus be firmly held to the support structure S.
- a resilient coil or expansion member 206 e.g. made of hard steel
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- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Dowels (AREA)
- Joining Of Building Structures In Genera (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2353728A CA2353728C (en) | 1998-12-01 | 1999-12-01 | Wedge anchor for concrete |
US09/857,403 US6829871B1 (en) | 1998-12-01 | 1999-12-01 | Wedge anchor for concrete |
AU13691/00A AU1369100A (en) | 1998-12-01 | 1999-12-01 | Wedge anchor for concrete |
US11/011,755 US7587873B2 (en) | 1998-12-01 | 2004-12-14 | Wedge anchor for concrete |
US12/585,453 US20100212250A1 (en) | 1998-12-01 | 2009-09-15 | Wedge anchor for concrete |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11053098P | 1998-12-01 | 1998-12-01 | |
US60/110,530 | 1998-12-01 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09857403 A-371-Of-International | 1999-12-01 | ||
US11/011,755 Continuation US7587873B2 (en) | 1998-12-01 | 2004-12-14 | Wedge anchor for concrete |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000032946A1 true WO2000032946A1 (en) | 2000-06-08 |
Family
ID=22333538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1999/001129 WO2000032946A1 (en) | 1998-12-01 | 1999-12-01 | Wedge anchor for concrete |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1369100A (en) |
CA (1) | CA2353728C (en) |
WO (1) | WO2000032946A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002012735A1 (en) * | 2000-08-08 | 2002-02-14 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Expansion bolt |
US6835036B2 (en) | 2003-03-07 | 2004-12-28 | Illinois Tool Works Inc. | Concrete anchor |
DE10340674A1 (en) * | 2003-09-04 | 2005-03-31 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Plug for anchoring bolts in concrete has sleeve which slides down over spreading section of same external diameter with two recesses, into which connecting strips on sleeve fit |
US11371242B2 (en) * | 2020-02-07 | 2022-06-28 | Joshua MAY | Machine walls |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015131289A1 (en) * | 2014-03-07 | 2015-09-11 | Robert Cousineau | Expansion anchor |
CN110984396A (en) * | 2019-12-24 | 2020-04-10 | 福州鼓楼纹英建筑工程有限责任公司 | Rear-mounted anchor net and operation method thereof |
Citations (16)
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US2647431A (en) | 1950-02-15 | 1953-08-04 | Ohio Brass Co | Expansion bolt |
FR1121145A (en) * | 1955-02-05 | 1956-07-23 | Anchor head especially for support rods used in mines | |
US2783673A (en) | 1953-03-30 | 1957-03-05 | Ohio Brass Co | Expander nut having three surfaces of different inclination |
US2787931A (en) * | 1953-05-29 | 1957-04-09 | Republic Steel Corp | Mine roof bolts with multiple piece shell having u-shaped spring holding means |
FR1327260A (en) * | 1962-04-06 | 1963-05-17 | Anchoring device, in particular for stabilizing mine roofs | |
US3250170A (en) | 1964-03-09 | 1966-05-10 | Norman H Siegel | Expansion shell |
GB1089510A (en) * | 1965-06-25 | 1967-11-01 | Chester Irving Williams | Anchor device for use with a hollow bolt rod |
US3620120A (en) | 1969-05-01 | 1971-11-16 | Richard H Warner | Mine roof bolt assembly |
DE2256822A1 (en) * | 1972-11-20 | 1974-06-06 | Manfred Dipl Ing Jost | ANCHORS, IN PARTICULAR DOWELS |
FR2349759A1 (en) * | 1976-05-14 | 1977-11-25 | Itt | Anchor bolt with expanding sleeve - has conical shoulder to provide reaction force on end of sleeve |
US4100748A (en) * | 1977-01-07 | 1978-07-18 | Stratabolt Corporation | Mine roof or rock bolt expansion anchor of the bail type |
US4337012A (en) | 1979-04-25 | 1982-06-29 | Heinrich Sohnius | Anchor bolt expansion shell |
US4403894A (en) | 1981-02-09 | 1983-09-13 | The Eastern Company | Rock bolt expansion anchor having windened expansion range |
US5028188A (en) | 1990-06-18 | 1991-07-02 | The Eastern Company | Expansion bolt |
US5344257A (en) | 1992-12-02 | 1994-09-06 | The Eastern Company | Mine roof expansion anchor and bail element |
US5352066A (en) | 1991-11-26 | 1994-10-04 | The Eastern Company | Mine roof/bolt anchor assembly and method of installation thereof |
-
1999
- 1999-12-01 CA CA2353728A patent/CA2353728C/en not_active Expired - Fee Related
- 1999-12-01 WO PCT/CA1999/001129 patent/WO2000032946A1/en active Application Filing
- 1999-12-01 AU AU13691/00A patent/AU1369100A/en not_active Abandoned
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2647431A (en) | 1950-02-15 | 1953-08-04 | Ohio Brass Co | Expansion bolt |
US2783673A (en) | 1953-03-30 | 1957-03-05 | Ohio Brass Co | Expander nut having three surfaces of different inclination |
US2787931A (en) * | 1953-05-29 | 1957-04-09 | Republic Steel Corp | Mine roof bolts with multiple piece shell having u-shaped spring holding means |
FR1121145A (en) * | 1955-02-05 | 1956-07-23 | Anchor head especially for support rods used in mines | |
FR1327260A (en) * | 1962-04-06 | 1963-05-17 | Anchoring device, in particular for stabilizing mine roofs | |
US3250170A (en) | 1964-03-09 | 1966-05-10 | Norman H Siegel | Expansion shell |
GB1089510A (en) * | 1965-06-25 | 1967-11-01 | Chester Irving Williams | Anchor device for use with a hollow bolt rod |
US3620120A (en) | 1969-05-01 | 1971-11-16 | Richard H Warner | Mine roof bolt assembly |
DE2256822A1 (en) * | 1972-11-20 | 1974-06-06 | Manfred Dipl Ing Jost | ANCHORS, IN PARTICULAR DOWELS |
FR2349759A1 (en) * | 1976-05-14 | 1977-11-25 | Itt | Anchor bolt with expanding sleeve - has conical shoulder to provide reaction force on end of sleeve |
US4100748A (en) * | 1977-01-07 | 1978-07-18 | Stratabolt Corporation | Mine roof or rock bolt expansion anchor of the bail type |
US4337012A (en) | 1979-04-25 | 1982-06-29 | Heinrich Sohnius | Anchor bolt expansion shell |
US4403894A (en) | 1981-02-09 | 1983-09-13 | The Eastern Company | Rock bolt expansion anchor having windened expansion range |
US5028188A (en) | 1990-06-18 | 1991-07-02 | The Eastern Company | Expansion bolt |
US5352066A (en) | 1991-11-26 | 1994-10-04 | The Eastern Company | Mine roof/bolt anchor assembly and method of installation thereof |
US5344257A (en) | 1992-12-02 | 1994-09-06 | The Eastern Company | Mine roof expansion anchor and bail element |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002012735A1 (en) * | 2000-08-08 | 2002-02-14 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Expansion bolt |
US6846141B2 (en) | 2000-08-08 | 2005-01-25 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Expansion bolt |
US6835036B2 (en) | 2003-03-07 | 2004-12-28 | Illinois Tool Works Inc. | Concrete anchor |
DE10340674A1 (en) * | 2003-09-04 | 2005-03-31 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Plug for anchoring bolts in concrete has sleeve which slides down over spreading section of same external diameter with two recesses, into which connecting strips on sleeve fit |
US11371242B2 (en) * | 2020-02-07 | 2022-06-28 | Joshua MAY | Machine walls |
Also Published As
Publication number | Publication date |
---|---|
CA2353728A1 (en) | 2000-06-08 |
AU1369100A (en) | 2000-06-19 |
CA2353728C (en) | 2010-10-19 |
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