GB2254392A - Self drilling expansion bolt - Google Patents
Self drilling expansion bolt Download PDFInfo
- Publication number
- GB2254392A GB2254392A GB9106796A GB9106796A GB2254392A GB 2254392 A GB2254392 A GB 2254392A GB 9106796 A GB9106796 A GB 9106796A GB 9106796 A GB9106796 A GB 9106796A GB 2254392 A GB2254392 A GB 2254392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hollow cylinder
- threaded rod
- expansion bolt
- elongated
- elongated hollow
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 11
- 239000007787 solid Substances 0.000 claims description 4
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
- F16B13/002—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose self-cutting
- F16B13/003—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose self-cutting with a separate drilling bit attached to or surrounded by the dowel element
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
Abstract
An expansion bolt includes an elongate hollow cylinder 22 having axial slots 222 at both ends, and an elongate screw-threaded rod 2 inserted into the elongate hollow cylinder 22, with the end 20 of the elongate threaded rod 2 formed as an enlarged drilling bit 21 which also serves to expand the cylinder 22. The hexagonal head 25 of the rod 2 is rotated with the rod 2 engaged in the nut 24, to pull the bit 21 into the end of the cylinder 22. <IMAGE>
Description
EXPANSION BOI,T The invention relates to an expansion bolt, more particularly to improvements relating to an expansion bolt.
Figure 1 shows an expansion bolt of the prior art.
As illustrated, it includes a threaded rod 1 having a cross head at one end thereof, an elongated hollow cylinder 12 having a plurality of axial slots formed at two ends of the same, and a tapered nut 13 having an internal thread 11 to engage the threaded rod 1.
To fix the expansion bolt in a wall, a hole similar to the size of the elongated hollow cylinder 12 must be drilled in the wall. The threaded rod 1 is inserted into the hollow cylinder 12 so that the threaded end extends out. The tapered nut 13 is threadably mounted on the protruding threaded end of the threaded rod 1.
Then, the whole expansion bolt is put into the hole 14.
When the cros head of the threaded rod 1 is rotated, the tapered nut 13 does not rotate and so is threadably drawn into the hollow cylinder 12, thereby expanding the er.d 10 of the hollow cylinder 12, fixing the asseriJly tightly in the hole.
The drawback of the above-mentioned expansion bolt is that one has to use a properly sized drill bit, similar to the size of the hollow cylinder, to bore a hole in a wall whenever one wishes to fie the expansion bolt therein. This is very inconvenient.
often, the tapered nut 13 to be used with the
threaded rod 1 is misplaced. When this occurs it takes
extra time to locate or replace said lost nut.
It is the main object of the present invention to
provide an expansion bolt set which includes a threaded
rod having a drill bit at one end thereof, so that
there is no need to drill a hole for. inserting the
present expansion bolt set, as in the prior art ones.
Another object of the present invention is to
provide an expansion bolt set which can engage the
mounting surface more securely than the prior art ones.
Accordingly, an expansion bolt of the present
invention includes a threaded rod having a hexagonal
head at one end thereof, and a hollow cylinder having a plurality of axial slots at both ends thereof. The
elongated threaded rod is sleeved into the hollow
cylinder so that the foot end of the threaded rod extends out of one end of the hollow cylinder. The out;;ard extending end of the elongated threaded rod
tapers outward to a cylindrical portion which is wider
than the internal diameter of the hollow cylinder, and
which is tipped with a pointed drilling bit. The
hollow cylinder has a plurality of radial projections
at one end thereof, said projections extending from the
outer surface of said hollow cylinder.
other features and advantages of the present
invention will become more apparent in the following detailed description, including drawings, all of which show a non-limiting form of the invention, and of which:
Figure 1 is an exploded view of an expansion bolt of the prior art.
Figure 2 is an expansion bolt of the prior art in applied configuration.
Figure 3 is an exploded view of an expansion bolt of the present invention.
Figure 4 is an expansion bolt of the present invention in applied configuration.
Figure 5 is an another form of an expansion bolt sf the present invention.
Referring to Figure 3, an expansion bolt of the present invention includes a. threaded rod 2 having a hexagonal screw head 25 at one end thereof and a hollow cylinder 22 . Both the screw head 25 and the threaded zori 2 are of a smaller diameter than the internal diameter of the hollow cylinder 22. The other end 20 of the threaded rod 2 tapers outward increasing in diameter to a solid cylindrical drilling bit 21 which has a larger diameter than the internal diameter of the hollow cylinder 22.
A groove 34 extends from a point on the threaded rod 2 where the increased diameter drilling bit 21 begins to the pointed tip 33 of the drill bit 21. The groove 34 gradually widens towards the tip 33.
The hollow cylinder 22 has a diameter wide enough to let the threaded rod pass through, and a plurality of axial slots 222 at both ends and a plurality of radial projections 221 extending from the outer surface of the hollow cylinder 22. The axial slots 222 have open ends, as depicted in the drawings.
When mounting the expansion bolt of the present invention in a surface, one does not need to drill a hole as in the prior art. It is only necessary to insert the threaded rod 2 into the hollow cylinder 22 so the drilling bit 21 of the threaded rod 2 extends out from one end of the hollow cylinder 22. Then the expansion bolt is fixed to the drill so the expansion bolt serves as a drilling tool. Thus a hole approximately equal to the size of the hollow cylinder 22 is drilled in the surface.
At this condition, the assembly having been inserted into the hole, a ring washer 23 with a through -hole smaller than the hollow cylinder 22 but wide enough to let the threaded rod pass through, is sleeved over the hexagonal head of the threaded rod to abut the hollow cylinder 22. A nut 24 is mounted over the ring washer 23 and is threadably engaged with the threaded rod 2. The hexagonal head 25 of the threaded rod 2 is turned in an anti-clockwise direction by a wrench, causing the threaded rod 2 to be drawn outward, which in turn draws the drilling bit 21 outward, thereby expanding the end of the hollow cylinder 22. Since there are a plurality of radial projections 221 extending from the outer surface of the hollow cylinder 22, the hollow cylinder 22 is fixed in the surface, a snown in Figure 4.
Figure 5 shows another preferred embodiment of the present ir.vention. In this embodiment, a wash ring and a threaded nut are not included. The operation of fixing the embodiment in the surface is however still as explained above.
Claims (6)
1. An expansion bolt comprising:
an elongated hollow cylinder 22 having a plurality of axial slots 222 extending from a first end and a second end of said elongated hollow cylinder 22t an elongated threaded rod 2 having a head 25 at one end thereof, said threaded rod 2 being inserted into said elongated hollow cylinder 22 with said end and the other end 20 of said elongated threaded rod 2 extending out respectively from said first and second end of said elongated hollow cylinder 2, said head 25 and said elongated threaded rod 2 being of a smaller diameter than the internal diameter of the elongated hollow cylinder 22, said other end 20 of said elongated threaded rod 2 being tapered outward increasing in diameter to a solid cylindrical drilling bit 21 having a larger diameter than the internal diameter of said elongated hollow cylinder 22.
2. An expansion bolt as claimed in Claim 1, wherein said second end of said elongated hollow cylinder 22, adjacent to said solid cylindrical drilling bit 21 of said threaded rod 2, has a plurality of radial projections 221 extending outward from the outer surface of said elongated hollow cylinder 22.
3. An expansion bolt as claimd in Claim 1 or Claim 2, wherein a nut 24 threadably engages with said elongated threaded rod 2, said nut 24 being exposed on said first end of said elongated hollow cylinder 22 when said elongated threaded rod is inserted in said elongated hollow cylinder.
4. An expansion bolt as claimed in any one of Claims 1 to 3, wherein a helical groove 34 extends from the free end of said solid cylindrical drilling bit 21 to a position adjacent to said other end of said elongated threaded rod 2.
5. An expansion bolt substantially as herein before described.
6. An expansion bolt substantially as hereinbefore described with reference to and as disclosed in any one of figures 3 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9106796A GB2254392A (en) | 1991-04-02 | 1991-04-02 | Self drilling expansion bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9106796A GB2254392A (en) | 1991-04-02 | 1991-04-02 | Self drilling expansion bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9106796D0 GB9106796D0 (en) | 1991-05-22 |
| GB2254392A true GB2254392A (en) | 1992-10-07 |
Family
ID=10692456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9106796A Withdrawn GB2254392A (en) | 1991-04-02 | 1991-04-02 | Self drilling expansion bolt |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2254392A (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5419664A (en) * | 1992-11-26 | 1995-05-30 | Fischerwerke, Artur Fischer Gmbh & Co. Kg. | Expansible anchor and method of making same |
| AU672742B3 (en) * | 1996-06-24 | 1996-10-10 | Irsaj, Jaro | Self drilling masonry anchor |
| AU683605B2 (en) * | 1996-06-24 | 1997-11-13 | Irsaj, Jaro | Self drilling masonry anchor |
| WO1997049929A1 (en) * | 1996-06-24 | 1997-12-31 | Irsaj, Martin, Jr. | Self drilling masonry anchor |
| WO2007104094A1 (en) * | 2006-03-13 | 2007-09-20 | Domenico Nardi | A self-drilling masonry bolt |
| WO2008041836A1 (en) * | 2006-10-06 | 2008-04-10 | Kok Hua Liow | An improved sleeve anchor |
| US20100316465A1 (en) * | 2006-07-10 | 2010-12-16 | Robert Andrew Gillis | Method of attaching setting and using a self-drilling anchor screw with one tool |
| DE102012200462A1 (en) * | 2012-01-13 | 2013-07-18 | Hilti Aktiengesellschaft | expansion anchor |
| WO2016123668A1 (en) * | 2015-02-04 | 2016-08-11 | Fero Group Pty Ltd | Improved drill bit for use with a friction bolt |
| WO2019140081A1 (en) * | 2018-01-12 | 2019-07-18 | Illinois Tool Works Inc. | Self-drilling anchor assembly |
| USD856787S1 (en) | 2017-09-27 | 2019-08-20 | Illinois Tool Works Inc. | Undercut anchor attachment barrel |
| USD886172S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886170S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886171S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886169S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886168S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD889949S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD889950S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD889948S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| US10995487B2 (en) | 2017-09-27 | 2021-05-04 | Illinois Tool Works Inc. | Undercut anchor, undercut anchor manufacturing method, and anchoring method |
| US11692578B2 (en) | 2018-09-26 | 2023-07-04 | Illinois Tool Works Inc. | Post-to-beam fastener |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1198318A (en) * | 1966-10-06 | 1970-07-08 | Artur Fischer | Improvements in Fastening Means |
| GB1232185A (en) * | 1968-12-21 | 1971-05-19 | ||
| GB1286660A (en) * | 1968-10-08 | 1972-08-23 | Etem Etablissement De Tech Mod | A fixing plug and placement thereof |
-
1991
- 1991-04-02 GB GB9106796A patent/GB2254392A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1198318A (en) * | 1966-10-06 | 1970-07-08 | Artur Fischer | Improvements in Fastening Means |
| GB1286660A (en) * | 1968-10-08 | 1972-08-23 | Etem Etablissement De Tech Mod | A fixing plug and placement thereof |
| GB1232185A (en) * | 1968-12-21 | 1971-05-19 |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5419664A (en) * | 1992-11-26 | 1995-05-30 | Fischerwerke, Artur Fischer Gmbh & Co. Kg. | Expansible anchor and method of making same |
| CN1054419C (en) * | 1992-11-26 | 2000-07-12 | 阿图尔-费希尔股份公司费希尔厂 | Expansible anchor of metal and a process for the manufacture thereof |
| AU672742B3 (en) * | 1996-06-24 | 1996-10-10 | Irsaj, Jaro | Self drilling masonry anchor |
| AU683605B2 (en) * | 1996-06-24 | 1997-11-13 | Irsaj, Jaro | Self drilling masonry anchor |
| WO1997049929A1 (en) * | 1996-06-24 | 1997-12-31 | Irsaj, Martin, Jr. | Self drilling masonry anchor |
| WO2007104094A1 (en) * | 2006-03-13 | 2007-09-20 | Domenico Nardi | A self-drilling masonry bolt |
| US7896594B2 (en) | 2006-03-13 | 2011-03-01 | Domenico Nardi | Self-drilling masonry bolt |
| US20100316465A1 (en) * | 2006-07-10 | 2010-12-16 | Robert Andrew Gillis | Method of attaching setting and using a self-drilling anchor screw with one tool |
| US8266779B2 (en) * | 2006-07-10 | 2012-09-18 | Rhino Self-Drilling Anchor Gp | Method of attaching setting and using a self-drilling anchor screw with one tool |
| WO2008041836A1 (en) * | 2006-10-06 | 2008-04-10 | Kok Hua Liow | An improved sleeve anchor |
| US9593703B2 (en) | 2012-01-13 | 2017-03-14 | Hilti Aktiengesellschaft | Expansion anchor |
| DE102012200462A1 (en) * | 2012-01-13 | 2013-07-18 | Hilti Aktiengesellschaft | expansion anchor |
| WO2016123668A1 (en) * | 2015-02-04 | 2016-08-11 | Fero Group Pty Ltd | Improved drill bit for use with a friction bolt |
| USD856787S1 (en) | 2017-09-27 | 2019-08-20 | Illinois Tool Works Inc. | Undercut anchor attachment barrel |
| USD880997S1 (en) | 2017-09-27 | 2020-04-14 | Illinois Tool Works Inc. | Undercut anchor attachment barrel |
| US10995487B2 (en) | 2017-09-27 | 2021-05-04 | Illinois Tool Works Inc. | Undercut anchor, undercut anchor manufacturing method, and anchoring method |
| WO2019140081A1 (en) * | 2018-01-12 | 2019-07-18 | Illinois Tool Works Inc. | Self-drilling anchor assembly |
| US11137008B2 (en) | 2018-01-12 | 2021-10-05 | Illinois Tool Works Inc. | Self-drilling anchor assembly |
| US11692578B2 (en) | 2018-09-26 | 2023-07-04 | Illinois Tool Works Inc. | Post-to-beam fastener |
| USD886169S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886168S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD889949S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD889950S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD889948S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD886171S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886170S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD886172S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9106796D0 (en) | 1991-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |