WO2001048388A1 - Expansion-type masonry anchor - Google Patents

Expansion-type masonry anchor Download PDF

Info

Publication number
WO2001048388A1
WO2001048388A1 PCT/AU2000/001597 AU0001597W WO0148388A1 WO 2001048388 A1 WO2001048388 A1 WO 2001048388A1 AU 0001597 W AU0001597 W AU 0001597W WO 0148388 A1 WO0148388 A1 WO 0148388A1
Authority
WO
WIPO (PCT)
Prior art keywords
expansion
sleeve
shank
anchor
threaded
Prior art date
Application number
PCT/AU2000/001597
Other languages
French (fr)
Inventor
Robert Urqhart Connell
Original Assignee
Illinois Tool Works Inc.
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 Illinois Tool Works Inc. filed Critical Illinois Tool Works Inc.
Priority to AU23323/01A priority Critical patent/AU2332301A/en
Publication of WO2001048388A1 publication Critical patent/WO2001048388A1/en

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
    • 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

Definitions

  • the present invention relates to masonry anchors and more particularly to a masonry anchor of expansion type.
  • Masonry anchors of expansion type conventionally comprise a cylindrical expansion sleeve formed of metal.
  • the sleeve is mounted over the shank of a bolt having at its forward or inner end a conical element of external diameter greater than the internal diameter of the sleeve.
  • the anchor is placed into a cylindrical cavity drilled into masonry and the conical element is drawn into the inner end portion of the sleeve by tightening the bolt. This action causes the inner end portion of the sleeve to expand outwardly into tight anchoring engagement with the cylindrical wall of the hole.
  • the conical expansion element is integrally formed with the shank of the bolt at its inner end, the outer end of the shank carrying a nut which is tightened against the external surface of the component in order to set the expansion anchor and clamp the component.
  • the nut is replaced by a so-called post-head which comprises an internally-threaded sleeve engaged with the shank of the bolt and having at its outer end a countersunk driving head which lies within a countersunk hole in the surface of the component.
  • This form of expansion anchor is known as a post-head anchor.
  • the threaded sleeve is capable of only limited axial movement along the shank of the bolt and when the expansion sleeve has provision for axial pull-down the limited extent of the axial movement of the post-head along the shank may be insufficient to achieve the required degree of pull-down.
  • a masonry anchor of expansion type comprising a threaded shank and an expansion sleeve, the expansion sleeve having facility for axial contraction after setting the anchor in order to provide a pull-down effect, the shank being threaded at its inner end portion to receive an internally-threaded expansion element which is driven into the inner end portion of the expansion sleeve upon setting of the anchor, and the shank having at its outer end portion an integrally formed post-head comprising an axially-extending sleeve portion having an outer diameter corresponding to the outer diameter of the expansion sleeve and a head portion at the outer end of the sleeve portion.
  • Figure 1 is an exploded view showing the components of a post-head expansion anchor in accordance with a preferred embodiment of the invention
  • Figure 2 is a view showing the anchor in its assembled state; and Figure 3 is a side view, partly in section, corresponding to Figure 2.
  • an expansion anchor comprises a shank 2 carrying an expansion sleeve 4.
  • the sleeve is capable of axial contraction to provide a pull-down effect and may feature the characteristics described in our earlier patents as aforesaid provided by apertures 5 within the sleeve and defining a series of deformable struts 5 a; alternatively, the sleeve may be of other suitable form to provide the required effect.
  • the shank 2 carries a post-head consisting of a sleeve-like portion 6 of an outer diameter substantially corresponding to the outer diameter of the expansion sleeve 4 and a countersunk head portion 8 slotted in its outer face (not shown) to receive a suitable driver.
  • the sleeve-like portion 6 is not threadedly mounted on the shank 2 but is instead formed integrally with the shank 2.
  • the bolt shank 2 is threaded at its inner end portion to receive the conical expansion element 10 which is internally threaded and is drawn into the interior of the expansion sleeve 4 by movement along the threaded shank when the anchor is tightened.

Abstract

An expansion-type masonry anchor comprises threaded shank (2) and expansion sleeve (4). Expansion sleeve (4) has apertures (5) and deformable struts (5a) for axial contraction after setting in order to provide a pull-down effect. Shank (2) is threaded at its inner end portion to receive internally-threaded conical expansion element (10) which is driven into the inner end portion of the expansion sleeve (4) upon setting of the anchor. Shank (2) has at its outer end portion an integrally formed post-head comprising axially-extending sleeve portion (6) whose outer diameter corresponds to the outer diameter of expansion sleeve (4) and head portion (8) at the outer end of sleeve portion (6).

Description

EXPANSION-TYPE MASONRY ANCHOR
The present invention relates to masonry anchors and more particularly to a masonry anchor of expansion type.
Masonry anchors of expansion type conventionally comprise a cylindrical expansion sleeve formed of metal. The sleeve is mounted over the shank of a bolt having at its forward or inner end a conical element of external diameter greater than the internal diameter of the sleeve. In use, the anchor is placed into a cylindrical cavity drilled into masonry and the conical element is drawn into the inner end portion of the sleeve by tightening the bolt. This action causes the inner end portion of the sleeve to expand outwardly into tight anchoring engagement with the cylindrical wall of the hole.
Masonry anchors of the above type are described in detail in our prior Australian patents Nos. 559285 and 697330. Each of these prior anchors features an expansion sleeve which is configured to contract axially during tightening of the bolt. The axial contraction of the expansion sleeve is termed "pull-down". The pull-down capability is introduced into the sleeve to enable a gap to be taken up between an object being clamped and the surface of the masonry as may exist if a component with a slight bow is being clamped and it also enables final tightening of the anchor to be translated into a high compression or clamping force between the component and the surface of the masonry, this latter feature being of significance when the component is subjected to cyclic loading.
Usually the conical expansion element is integrally formed with the shank of the bolt at its inner end, the outer end of the shank carrying a nut which is tightened against the external surface of the component in order to set the expansion anchor and clamp the component. For certain applications the nut is replaced by a so-called post-head which comprises an internally-threaded sleeve engaged with the shank of the bolt and having at its outer end a countersunk driving head which lies within a countersunk hole in the surface of the component. This is used in situations where an exposed nut and associated portion of the bolt shank projecting from the external surface of the component is unsuitable, for example due to aesthetic considerations. This form of expansion anchor is known as a post-head anchor. However due to the presence of the countersunk head which effectively closes the outer end of the threaded sleeve the threaded sleeve is capable of only limited axial movement along the shank of the bolt and when the expansion sleeve has provision for axial pull-down the limited extent of the axial movement of the post-head along the shank may be insufficient to achieve the required degree of pull-down.
According to the present invention, there is provided a masonry anchor of expansion type comprising a threaded shank and an expansion sleeve, the expansion sleeve having facility for axial contraction after setting the anchor in order to provide a pull-down effect, the shank being threaded at its inner end portion to receive an internally-threaded expansion element which is driven into the inner end portion of the expansion sleeve upon setting of the anchor, and the shank having at its outer end portion an integrally formed post-head comprising an axially-extending sleeve portion having an outer diameter corresponding to the outer diameter of the expansion sleeve and a head portion at the outer end of the sleeve portion.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
Figure 1 is an exploded view showing the components of a post-head expansion anchor in accordance with a preferred embodiment of the invention;
Figure 2 is a view showing the anchor in its assembled state; and Figure 3 is a side view, partly in section, corresponding to Figure 2.
As shown in the accompanying drawings an expansion anchor comprises a shank 2 carrying an expansion sleeve 4. The sleeve is capable of axial contraction to provide a pull-down effect and may feature the characteristics described in our earlier patents as aforesaid provided by apertures 5 within the sleeve and defining a series of deformable struts 5 a; alternatively, the sleeve may be of other suitable form to provide the required effect. At its outer end portion the shank 2 carries a post-head consisting of a sleeve-like portion 6 of an outer diameter substantially corresponding to the outer diameter of the expansion sleeve 4 and a countersunk head portion 8 slotted in its outer face (not shown) to receive a suitable driver.
However in contrast to previous forms of post-head anchor, the sleeve-like portion 6 is not threadedly mounted on the shank 2 but is instead formed integrally with the shank 2. The bolt shank 2 is threaded at its inner end portion to receive the conical expansion element 10 which is internally threaded and is drawn into the interior of the expansion sleeve 4 by movement along the threaded shank when the anchor is tightened. As a result of this configuration when the anchor is set within the hole by expansion of the expansion sleeve 4, further tightening will cause the integral post-head and shank to displace inwardly with the inwards displacement being accommodated by axial collapse of the expansion sleeve 4 due to the abutting engagement between the inner axial end edge of the sleeve-like portion 6 of the head with the outer axial end edge of the expansion sleeve 4 as the threaded part of the shank 2 travels downwardly or inwardly relative to the internally- threaded expansion cone. It will be understood that the necessary thread length needed to achieve full setting and maximum pull-down (determined by the maximum permissible axial contraction of the expansion sleeve) is unaffected by the presence of the post-head.
The embodiment has been described by way of example only and modifications are possible within the scope of the invention.
Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers.

Claims

Claims:
1. A masonry anchor of expansion type comprising a threaded shank and an expansion sleeve, the expansion sleeve having facility for axial contraction after setting the anchor in order to provide a pull-down effect, the shank being threaded at its inner end portion to receive an internally-threaded expansion element which is driven into the inner end portion of the expansion sleeve upon setting of the anchor, and the shank having at its outer end portion an integrally formed post-head comprising an axially-extending sleeve portion having an outer diameter corresponding to the outer diameter of the expansion sleeve and a head portion at the outer end of the sleeve portion.
2. A masonry anchor according to claim 1, wherein the pull-down effect of the expansion sleeve is provided by apertures within the sleeve and defining a series of deformable struts.
3. A masonry anchor according to claim 1 or claim 2, wherein the post-head is of countersunk form.
PCT/AU2000/001597 1999-12-23 2000-12-22 Expansion-type masonry anchor WO2001048388A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23323/01A AU2332301A (en) 1999-12-23 2000-12-22 Expansion-type masonry anchor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ4847A AUPQ484799A0 (en) 1999-12-23 1999-12-23 Masonry anchors
AUPQ4847 1999-12-23

Publications (1)

Publication Number Publication Date
WO2001048388A1 true WO2001048388A1 (en) 2001-07-05

Family

ID=3818986

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/001597 WO2001048388A1 (en) 1999-12-23 2000-12-22 Expansion-type masonry anchor

Country Status (2)

Country Link
AU (1) AUPQ484799A0 (en)
WO (1) WO2001048388A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512448A (en) * 1966-02-25 1970-05-19 Aerpat Ag Blind fastener
GB1487030A (en) * 1974-11-12 1977-09-28 Wernerson Hans Ivan Expansion bolts
AU7531491A (en) * 1990-09-10 1992-03-12 Ramset Fasteners (Aust.) Pty. Limited Masonry anchors
GB2254901A (en) * 1991-04-20 1992-10-21 Rawlplug Co Ltd Radially expansible and axially collapsible sleeves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512448A (en) * 1966-02-25 1970-05-19 Aerpat Ag Blind fastener
GB1487030A (en) * 1974-11-12 1977-09-28 Wernerson Hans Ivan Expansion bolts
AU7531491A (en) * 1990-09-10 1992-03-12 Ramset Fasteners (Aust.) Pty. Limited Masonry anchors
GB2254901A (en) * 1991-04-20 1992-10-21 Rawlplug Co Ltd Radially expansible and axially collapsible sleeves

Also Published As

Publication number Publication date
AUPQ484799A0 (en) 2000-02-03

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