GB2139726A - Bolt anchor - Google Patents
Bolt anchor Download PDFInfo
- Publication number
- GB2139726A GB2139726A GB08313134A GB8313134A GB2139726A GB 2139726 A GB2139726 A GB 2139726A GB 08313134 A GB08313134 A GB 08313134A GB 8313134 A GB8313134 A GB 8313134A GB 2139726 A GB2139726 A GB 2139726A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeve
- anchor
- spreader
- ofthe
- end portion
- 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
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc 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
- 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
- F16B13/066—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 a separate expander-part, actuated by the screw, nail or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
A light duty bolt anchor for lightweight concrete and other solid building materials comprising a sleeve 10 and conical spreader 12, the latter with a tapped bore to receive the bolt. The leading end portion of the sleeve which receives the spreader is of uniform wall thickness and extends from the leading end to a shoulder 18 within the sleeve. The wall is divided into three segments by slits along which adjacent segments abut one another. The leading end portion of the sleeve is expanded radially to anchor the sleeve in a bore hole when driven over the spreader by punch 40 (as shown) or when the spreader is pulled into it. The sleeve of the bolt anchor may be manufactured economically by extrusion from billets parted from wire. <IMAGE>
Description
SPECIFICATION
Bolt anchor
This invention is concerned with an anchor for a threaded bolt and of a kind comprising a sleeve into a leading end portion of which atapped spreader with a part conical outer surface is received to cause said end portion of the sleeve to expand radially and grip the wall of a hole into which the anchor has been inserted.
A known bolt anchor ofthe aforementioned kind has a sleeve which is cylindrical on the outside and of uniform wall thickness over most of its length, but the bore th rough which gradually increases in diameter for a short distance towards the leading end where the wall thickness consequently decreases. A leading end portion of the sleeve, including that with the tapering wall and extending beyond it, is separated by longitudinal slots into four equal segments. The cone angle of the outersurface ofthe spreader is complementaryto that of the tapering wall of the sleeve so that the spreader can be sufficiently firmly held by the sleeve for insertion in a hole in which the anchor is to be set.
Such a hole may be drilled in concrete, masonry our other solid building material. After insertion, if the spreader engages the bottom of the hole, the sleeve may be hammered over itto expand the leading end portion and therebysecure the anchor in place. But whether or not the sleeve is fully advanced over the spreader, when an article comes to be secured by a boltthreaded into the spreader, and the bolt tight- ened, expansion, orfurther expansion, ofthe sleeve maytake place by drawing the spreader further into the sleeve.
The sleeve of the bolt anchor referred to in the last preceding paragraph is made from tube, the tapering ofthewall thickness being effected byturning and the slots providing by milling.
It is an object ofthe present invention to provide an improved bolt anchorwhich is economical to manufacture and simpleto install for light duty work in materials including concrete, brickwork and natural stone.
The invention provides, in one of its several aspects, a bolt anchor ofthe kind comprising a sleeve and a tapped spreader with a part-conical outer surface which is received into a leading end portion of the sleeve to cause said end portion to expand radially and grip the wall of a hole into which the anchor has been inserted, the sleeve having athrough bore comprising two portions of different diameters which meetatan annularshoulder,the largerdiameterbore portion extending from the leading end ofthe sleeve and being of uniform wall thickness, and the wall of said larger diameter bore portion being divided by longitudinal slits into a plurality of segments which are in abutting contact with each other along the slits.
Preferably, the spreader of an anchor as set out in the last preceding paragraph has an end portion with a cylindrical outer surface extending from the narrow end of its part conical surface, such cylindrical end portion fitting into the larger diameter bore portion of the sleeve. The slits also preferably extend from the leading end to said shoulder and the wall at the trailing end may be thickened for a short distance.
The invention also provides a method of making a sleevefor a bolt anchor as referred to comprising the steps of parting off a billetfrom metal wire, subjecting billetto extrusion to elongate it and form the two bore portions of different diameters, punching metal out at thetrailing endtocompletethethrough bore, slitting the wall ofthe larger diameter bore portion by relative displacement of metal along uniformly spaced longitudinal lines and restoring the displaced metal into abutting contact along said lines.
A bolt anchor in accordance with the invention and illustrative thereof byway ofexamplewill now be described in detail,togetherwith a preferred method of manufacture of its sleeve, with reference to the accompanying drawings.
In the accompanying drawings:
Figure lisa side view of the two parts, sleeve and spreader, ofthe illustrative anchor;
Figure 2 is a view in longitudinal section ofthe illustrative anchor inserted into a hole in a building structure before being secured in place;
Figure 3 is a viewsimilarto Figure 2 ofthe anchor after initial installation by means of a punch; and
Figure4 is a yet further similar view ofthe anchor after a bolt threaded into it has been tightened.
The illustrative anchor comprises a sleeve 10 and spreader 12. The sleeve 10 has a bore through it having a larger diameter portion 14 at its leading end and a smaller diameter portion 16which meet at an annularshoulder 18. Along the wall ofthe bore 16 run three uniformly spaced slits 20 which divide the wall into three uniform portions, adjacent ones of which are in abutting contact along the slits. The wall of the larger diameter bore 14 is of uniform cross section and its thickness is in the order of 10% to 20%, and preferably not morethan 17%, of its radius. The wall of the smaller diameter bore is about a quarter of a millimeterthickerthanthatoftheportion 14, resulting in the step of about this width between the two portions.At its trailing end, a portion 22 ofthe wall of the sleeve is thicker for a short distance, the external diameter being slightly greaterthan that of the otherwise uniform diameter of the outer surface ofthe sleeve and the internal diameter being slightly smaller than that of the bore portion 16.
The spreader 12 of the illustrative anchor has a part-conical outer surface 24 leading at its narrow end to a cylindrical extension 26 which fits into the bore 14 of the sleeve sufficiently tightlyto hold the sleeve of the spreadertogetherfor handling purposes, and a cylindrical extension 28-at its broad end. Through the spreader extends a tapped bore 30.
Both the sleeve 10 and spreader 12 are made of mild steel and are zinc plated. Conveniently, and in accordance with a further aspect ofthe invention, the sleeve ofthe illustrative anchor is made from a solid billet parted from wire stock and subject to extrusion to form the walls ofthe bore portions 14 and 20. The closed slits 20 are then made in the wall ofthe portion
14 by passing the leading end portion ofthe sleeve into a cutting device with three cutters which slit the wall longitudinally by relative displacementofthe metal atthe sides of the split lines and, on withdrawal from the cutters, restoring the wall to its cylindrical
configuration in which adjacent segments formed by
the slitting operation come into abutting relationship
with one another.Thereafter, a plug of surplus metal is
punched outto open the bore through the trailing end portion 22.
Installation ofthe illustrative anchor can be readily effected by introducing the sleeve 10 with the spreader 12 assembled in its leading end portion as in Figure 2 into a hole H drilled to a predetermined desired depth, so that advance ofthe spreader is arrested by thebottom B ofthe holes. Becausethewall ofthe largerdiameter bore portion 14 is relativelythin, gentle taps with a happerwill advance the sleeve over the spreader, thus radially expanding the leading end portion of the sleeve. During such tapping, the thicker end portion 22 ofthe sleeve resists undue deformation ofthe sleeve at this end.Introduction of the anchor into the hole and advance ofthe sleeve 10 over the spreader 12 is preferably effected with the aid of a punch 40 (Figure 3) having a tip 42 of a diameter such that itjust passes freely into the tapped bore 30 ofthe spreader, the tip being longer than the spreader, an intermediate portion 44 of a diameterjustto pass through the portion 22 ofthe sleeve, and a shoulder 46 to abut the end ofthe sleeve. Advance ofthe punch 40 is arrested byengagementtothetip42withthe bottom of the hole; the operator can feel when such engagement has occurred and then knows that the sleeve 10 has advanced well over the spreader 12 becausetheanchoristhenwhollycontained in the distance between the shoulder 46 and the end ofthe punch.This distance is such as normally to leave a gap 50 of aboutone millimetre between the spreader 12 and the shoulder 18 of the sleeve.
The illustrative anchor is thus installed. The punch is removed and the anchor is readyto receive a bolt 60 (figure 4) which is to serve to secure an articleAto be heldbyahead62oftheboltthroughan intermediate washer W. As the bolt 60 is tightened, the spreader 12 will be drawn up to the shoulder 18 ofthe sleeve, whereupon the resistance ofthe sleeve to being pulled out of the hole H becomes fully effective.
The illustrative anchor is economical to manufac ture,the sleeve by an extrusion process from wire, and provides a firm fixing for light duty purposes in concrete, brickwork, natural stone and othersolid building materials.
Claims (8)
1. Aboltanchorofthe kind comprising a sleeve and a tapped spreader with a part-conical outer surfacewhich is received into a leading end portion of the sleeve to cause said end portion to expand radially and gripthewall of a hole in which the anchor has been inserted, the sleeve having athrough bore comprising two portions of different diameters which meet at an annular shoulder, the larger diameter bore portion extending from the leading end of the sleeve and being of uniform wall thickness, and the wall of said larger diameter bore portion being divided by longitudinal slits into a plurality of segments which are in abutting contactwith each otheralongtheslits.
2. An anchor according to claim 1 ofwhichthe spreader has an end portion with a cylindrical outer surface extending from the narrow end of its partconical surface, such cylindrical end portion fitting into the larger diameter bore portion ofthe sleeve.
3. An anchor according to claim 1 in which said longitudinal slits in the sleeve extend from the leading end to said shoulder.
4. An anchor according to anyone ofthepreceding claims in which the wall ofthe sleeve is thickened for a short distance at the trailing end.
5. An anchor according to any one ofthe preceding claims, the sleeve which has been made by extrusion from a solid billet.
6. A method of making a sleeve for an anchor according to claim 1 comprising the steps of parting offabilletfrom metal wire, subjecting the billetto extrusion to elongate it and form thetwo bore portions of different diameters, punching metal out at thetrailing end to completethethrough bore, slitting the wall of the larger diameter bore portion by relative displacement of metal along uniformly spaced longitudinal lines and restoring the displaced metal into abutting contact along said lines.
7. A method of making a sleeve for a bolt anchor substantially as herein before described with reference to the accompanying drawings.
8. A bolt anchor substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08313134A GB2139726B (en) | 1983-05-12 | 1983-05-12 | Bolt anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08313134A GB2139726B (en) | 1983-05-12 | 1983-05-12 | Bolt anchor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8313134D0 GB8313134D0 (en) | 1983-06-15 |
| GB2139726A true GB2139726A (en) | 1984-11-14 |
| GB2139726B GB2139726B (en) | 1986-08-20 |
Family
ID=10542633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08313134A Expired GB2139726B (en) | 1983-05-12 | 1983-05-12 | Bolt anchor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2139726B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0154466A1 (en) * | 1984-02-24 | 1985-09-11 | The Rawlplug Company Limited | Bolt anchor |
| EP0295201A1 (en) * | 1987-06-09 | 1988-12-14 | HILTI Aktiengesellschaft | Expansion plug having limited expansion |
| EP0378770A1 (en) * | 1988-12-23 | 1990-07-25 | fischerwerke Artur Fischer GmbH & Co. KG | Chissel for driving-in anchor bolts |
| EP0503677A2 (en) * | 1991-03-14 | 1992-09-16 | MÄCHTLE GmbH | Heavy duty anchor |
| EP3020888A1 (en) * | 2014-11-17 | 2016-05-18 | DL Fischer GmbH | Fall prevention system for vertical, horizontal or inclined surfaces of structures |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB495653A (en) * | 1937-05-21 | 1938-11-17 | John Duncan | Improvements in or relating to wall-plugs and the like fastenings |
| GB1229666A (en) * | 1967-12-16 | 1971-04-28 |
-
1983
- 1983-05-12 GB GB08313134A patent/GB2139726B/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB495653A (en) * | 1937-05-21 | 1938-11-17 | John Duncan | Improvements in or relating to wall-plugs and the like fastenings |
| GB1229666A (en) * | 1967-12-16 | 1971-04-28 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0154466A1 (en) * | 1984-02-24 | 1985-09-11 | The Rawlplug Company Limited | Bolt anchor |
| EP0295201A1 (en) * | 1987-06-09 | 1988-12-14 | HILTI Aktiengesellschaft | Expansion plug having limited expansion |
| EP0378770A1 (en) * | 1988-12-23 | 1990-07-25 | fischerwerke Artur Fischer GmbH & Co. KG | Chissel for driving-in anchor bolts |
| EP0503677A2 (en) * | 1991-03-14 | 1992-09-16 | MÄCHTLE GmbH | Heavy duty anchor |
| EP0503677A3 (en) * | 1991-03-14 | 1993-01-13 | Maechtle Gmbh | Heavy duty anchor |
| EP3020888A1 (en) * | 2014-11-17 | 2016-05-18 | DL Fischer GmbH | Fall prevention system for vertical, horizontal or inclined surfaces of structures |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8313134D0 (en) | 1983-06-15 |
| GB2139726B (en) | 1986-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |