GB2212584A - Expansible plug for anchoring in undercut drilled hole - Google Patents
Expansible plug for anchoring in undercut drilled hole Download PDFInfo
- Publication number
- GB2212584A GB2212584A GB8826984A GB8826984A GB2212584A GB 2212584 A GB2212584 A GB 2212584A GB 8826984 A GB8826984 A GB 8826984A GB 8826984 A GB8826984 A GB 8826984A GB 2212584 A GB2212584 A GB 2212584A
- Authority
- GB
- United Kingdom
- Prior art keywords
- expansible plug
- expansible
- cone
- portions
- tip
- 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.)
- Granted
Links
- 238000004873 anchoring Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- 238000009527 percussion Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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
- F16B13/08—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 with separate or non-separate gripping parts moved into their final position in relation to the body of the device without further manual operation
- F16B13/0858—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 with separate or non-separate gripping parts moved into their final position in relation to the body of the device without further manual operation with an expansible sleeve or dowel body driven against a tapered or spherical expander plug
-
- 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
- F16B2013/007—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose to be fastened in undercut holes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Joining Of Building Structures In Genera (AREA)
Description
1 Q 1 Expansible plugs for anchoring in undercut drilled holes The
invention relates to expansible plugs for anchoring in undercut drilled holes and more particularly to an expansible plug for anchoring in an undercut drilled hole, the plug having a bolt which, in use, abuts against the base of the drilled hole, has an expander cone and is surrounded by a partially slit expansible sleeve In drilled holes that widen conically, metal expansible plugs can be anchored virtually free of expansion pressure, very high pull-out values being obtained as a result of the considerable expansion of the expansible element. Known expansible plugs have an expander cone onto which an expansible sleeve can be hammered using a suitable percussion tool. The shaft of the bolt has an external thread which projects out of the drilled hole and the shaft can be tightened against an object that is to be secured, using a screw nut.
For proper assembly of the known expansible plugs drilling dust has to be removed by suction or by blowing. If drilling dust is not properly removed or the undercut is not properly made the drilling dust collects in front A 2 2 259 1-t of the end face of the expansible sleeve as it is driven onto the expander cone with the result that more energy is required to drive it in and even then the expansible sleeve cannot be hammered right on to the expander cone.
The problem on which the invention is based is to provide an expansible plug for anchoring in undercut drilled holes which allows proper anchoring even if the drilling dust has not altogether been removed.
The present invention provides an expansible plug for anchoring in an undercut drilled hole, the plug having a bolt which, in use, abuts against the base of the drilled hole, has an expander cone and is surrounded by a partially slit expansible sleeve, characterized in that the expander cone of the bolt is provided with portions that extend from the outer end of the cone and slope away together to form a tip to the end of the cone.
The above-mentioned problem can be solved according to the invention by the provision of an expansible plug for anchoring in an undercut drilled hole, the plug having a bolt which, in use, abuts against the base of the drilled hole, has an expander cone and is surrounded by a partially slit expansible sleeve, characterized in that the expander cone of the bolt is provided with at least two sloping portions that extend from the outer end T of the cone and lie opposite one another.
Because of the sloping, or angled, portions opposite one another sloping away to a tip, the resulting tip of the bolt can sit at the centre of the base of the drilled hole. As a result of the sloping portions, space is created between the base of the drilled hole and the end face of the cone into which space any drilling dust which is still present when the expansible sleeve is being hammered on can escape. As a result the end face of the expansible sleeve can be driven onto the expander cone of the bolt until it comes to rest against the base of the drilled hole.
The sloping portions lying opposite one another form a roof-like tip at the end face of the expander cone which acts additionally to secure the bolt against rotation when the expansible sleeve is driven on by rotary percussion.
Adequate space for accommodating drilling dust that has not been removed is produced especially when the angle at the tip of two opposite sloping portions is, at approximately 90 degrees, smaller than the approximately 120 degree angle at the tip of a conventional drill used to produce the drilled hole.
In order to make as little reduction as possible in the support surface for the expansible sleeve on the expander cone, it is also possible to make, preferably four, notch-like portions to define the sloping portions in the expander cone. The end face of the expander cone thus forms a cross-shaped roof point.
Expansible plugs constructed in accordance with the invention will now be described, by way of example only, with reference to the accompanying drawing, in which:
Figure 1 shows an expansible plug that has been inserted into a drilled hole and expanded; Figure 2 shows the end face of the expander cone of the expansible plug according to Figure 1, and Figure 3 shows the end face of a further embodiment of an expander cone.
The expansible plug shown in Figure 1 is inserted into a drilled hole 1 which has in the region of its base an undercut 2.
The expansible plug comprises a bolt 3 having an expander cone 4 onto which an expansible sleeve 5 can be driven in order to anchor the expansible plug. The end of A c 1 the bolt 3 that projects from the drilled hole is provided with an external thread 6 onto which a nut 9 can be screwed in order to secure an object 7 to masonry 8.
The expander cone 4 of the bolt 2 in the embodiment according to Figure 1 is provided with two sloping-away or angled portions 10 starting from the outer end of the cone. The angle at the tip of the two opposite sloping portions is, at approximately 90 degrees, smaller than the angle at the tip of the conventional drill used to produce the drilled hole. This results in a space 11 between the base of the drilled hole and the sloping portions which accommodates the drilling dust pushed towards the base of the drilled hole by the expansible sleeve when the expansible sleeve 5 is being driven onto the expander cone 4. As a result, the expansible sleeve can be driven right onto the expander cone.
The roof-like tip (see Figure 2) produced by the two opposite sloping portions at the same time secures the bolt 2 against rotation when the expansible sleeve is driven on by rotary percussion.
In the embodiment according to Figure 3 four notchlike portions 101 defining sloping portions are provided which lead to a cross-shaped tip at the outer end face of the expander cone 4.
Claims (1)
- Claims:1. An expansible plug for anchoring in an undercut drilled hole, the plug having a bolt which, in use, abuts against the base of the drilled hole, has an expander cone and is surrounded by a partially slit expansible sleeve, characterized in that the expander cone of the bolt is provided with portions that extend from the outer end of the cone and slope away together to form a tip to the end of the cone.2. An expansible plug according to claim 1, characterized in that the tip angle is substantially less than 120 degrees.3. An expansible plug according to claim 2, characterized in that the tip angle is approximately 90 degrees.4. An expansible plug according to any preceding claim, characterized in that the portions are defined by a nonre-entrant arrangement of plane faces.5. An expansible plug as claimed in claim 4, characterized in that the number of plane faces is two.6. An expansible plug according to any one of claims 1 to 3, characterized in that the portions are defined by a re-entrant arrangement of plane faces.7. An expansible plug according to claim 6, characterized in that the number of plane faces is eight, the arrangement defining four notch-like portions.8. An expansible plug for anchoring in an undercut drilled hole, the plug having a bolt which, in use, abuts against the base of the drilled hole, has an expander cone and is surrounded by a partially slit expansible sleeve, characterized in that the expander cone of the bolt is provided with at least two sloping portions that extend from the outer end of the cone and lie opposite one another.9. The use of an expansible plug according to claim 8, characterized in that the angle at the tip of two, or the two, opposite sloping portions is smaller than the angle at the tip of the drill used to make the drilled hole.QI 10. An expansible plug according to claim 8, characterized in that the angle at the tip of two, or the two, opposite sloping portions is substantially smaller than 120 degrees.11. An expansible plug according to claim 10, characterized in that the angle at the tip of two, or the two, opposite sloping portions is approximately 90 degrees.12. An expansible plug or the use of an expansible plug according to any one of claims 8 to 11, characterized in that the cone has notch-like portions at its outer end defining the sloping portions.13. An expansible plug or the use of an expansible plug according to claim 12, characterized in that the cone has four notch-like portions at its outer end defining a cross-shaped tip to the cone.18. An expansible plug substantially as herein described with reference to, and as illustrated by, Figures 1 and 2 of the accompanying drawing.19. An expansible plug according to claim 18 but modified substantially as herein described with reference to, and as illustrated by, Figure 3 of the accompanying drawing.Published 1989 atThePatent Office. State House. 66"71 High Holborn. London WCJR4TP-Furt-her copies mkvbe obtained from ThePatent0frice. Sales Branch, St Mary Cray, Orpington. Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1/87
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873739371 DE3739371A1 (en) | 1987-11-20 | 1987-11-20 | SPREADING DOWEL FOR ANCHORING IN UNDERCUT DRILL HOLES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8826984D0 GB8826984D0 (en) | 1988-12-21 |
| GB2212584A true GB2212584A (en) | 1989-07-26 |
| GB2212584B GB2212584B (en) | 1991-08-21 |
Family
ID=6340900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8826984A Expired - Lifetime GB2212584B (en) | 1987-11-20 | 1988-11-18 | Expansible plugs for anchoring in undercut drilled holes |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH677520A5 (en) |
| DE (1) | DE3739371A1 (en) |
| FR (1) | FR2623576B1 (en) |
| GB (1) | GB2212584B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| USD886168S1 (en) | 2019-01-09 | 2020-06-02 | Illinois Tool Works Inc. | Anchor assembly drill bit |
| USD889950S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD886172S1 (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 |
| USD889948S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
| USD889949S1 (en) | 2019-01-09 | 2020-07-14 | Illinois Tool Works Inc. | Anchor assembly sleeve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB754482A (en) * | 1953-04-28 | 1956-08-08 | Anciens Ets Lissments Goldenbe | Improvements in and relating to bolt and like anchoring devices |
| GB1286660A (en) * | 1968-10-08 | 1972-08-23 | Etem Etablissement De Tech Mod | A fixing plug and placement thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE933328C (en) * | 1953-10-13 | 1956-05-03 | Wilhelm Weghuber | Method for connecting rock layers by means of rock bolts in mining and means for practicing the method |
| DE1988822U (en) * | 1966-10-06 | 1968-07-04 | Artur Fischer | SELF-DRILLING FIXING ELEMENT. |
| US4026186A (en) * | 1976-02-23 | 1977-05-31 | Illinois Tool Works Inc. | Self-drilling one-piece masonry anchor |
| DE3007650C2 (en) * | 1980-02-29 | 1982-04-01 | Artur Dr.H.C. 7244 Waldachtal Fischer | Expansion dowel for anchoring in drilled holes made conically widened inwards |
| DE3411431A1 (en) * | 1984-03-28 | 1985-10-03 | Artur Dr.H.C. 7244 Waldachtal Fischer | SPREADING DOWEL |
| EP0163120B1 (en) * | 1984-05-29 | 1988-06-08 | Fischerwerke Arthur Fischer GmbH & Co. KG | Expansion dowel |
| DE3535262A1 (en) * | 1985-10-03 | 1987-04-09 | Upat Max Langensiepen Kg | SPREADING ANCHOR |
-
1987
- 1987-11-20 DE DE19873739371 patent/DE3739371A1/en not_active Withdrawn
-
1988
- 1988-10-17 CH CH387188A patent/CH677520A5/de not_active IP Right Cessation
- 1988-11-14 FR FR8814769A patent/FR2623576B1/en not_active Expired - Lifetime
- 1988-11-18 GB GB8826984A patent/GB2212584B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB754482A (en) * | 1953-04-28 | 1956-08-08 | Anciens Ets Lissments Goldenbe | Improvements in and relating to bolt and like anchoring devices |
| GB1286660A (en) * | 1968-10-08 | 1972-08-23 | Etem Etablissement De Tech Mod | A fixing plug and placement thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3739371A1 (en) | 1989-06-01 |
| GB2212584B (en) | 1991-08-21 |
| FR2623576A1 (en) | 1989-05-26 |
| CH677520A5 (en) | 1991-05-31 |
| FR2623576B1 (en) | 1990-06-01 |
| GB8826984D0 (en) | 1988-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931118 |