EP3685017A1 - Expansion assembly - Google Patents
Expansion assemblyInfo
- Publication number
- EP3685017A1 EP3685017A1 EP18786655.3A EP18786655A EP3685017A1 EP 3685017 A1 EP3685017 A1 EP 3685017A1 EP 18786655 A EP18786655 A EP 18786655A EP 3685017 A1 EP3685017 A1 EP 3685017A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- serrations
- series
- serration
- expansion
- distal end
- 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- Withdrawn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
- 239000011435 rock Substances 0.000 claims abstract description 30
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- F16B2013/008—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose used for mining purposes
Definitions
- This invention relates to an improved expansion assembly for a rock bolt.
- a typical expansion assembly includes an expansion shell which has a plurality of leaves that are arcuate and arranged circumferentially, joined together by a connecting element, and a tapered plug, engaged with a rock bolt, that is drawn or pushed through the expansion shell to cause the shell to radially expand.
- the expansion assembly In use, with the expansion shell assembly engaged with a rock bolt, the expansion assembly is actuated, in a manner mentioned above, to expand into contact with the walls of a rock hole, in which the bolt is inserted, to anchor the bolt in the rock hole.
- each leaf is formed with a plurality of ridges, teeth or serrations which provide a frictional interface with the rock hole walls.
- These serrations typically, are of standard and equal dimension.
- the present invention at least partly solves the aforementioned problems.
- the invention provides an expansion assembly for a rock bolt which includes: an expansion shell which extends between a distal end and a proximal end, the shell comprising of; a joining formation; and a plurality of expansion leaves, each leaf having a body with a cylindrical outer surface formed with a plurality of serrations extending circumferentially around the outer surface, and a smooth tapered inner surface which, when the leaves are held together by the joining formation, provide a tapered passage which tapers inwardly from the distal end to the proximal end; and a tapered plug which is engageable to a rock bolt and which is arranged to pass into the tapered passage from the proximal end to force apart the leaves; wherein each serration is defined by a conical surface and an undercut surface which extends laterally relatively to the axis of the passage; and wherein the plurality of serrations includes a first series of serrations which starts adjacent the distal end, with each serration of this series having an undercut surface with a width in
- the shell may comprise of two, three or four leaves.
- the joining formation may be at least one joining ring of a suitable resiliently deformable material, which encircles the leaves adjacent their proximal ends.
- Each leaf may have a lip between the distal end and the start of the first series of serrations.
- the lip may extend beyond the lateral extent of the serrations.
- the first range is between, and including, 0.5mm - 1 mm.
- each serration of the first series of serrations has an undercut surface with a uniform width.
- the second range is between, and including, 1 mm - 4mm.
- the conical surface and the undercut surface may intersect along an edge, through which a plane of orientation is defined, and the conical surface may intersect the plane in a range 60° - 80°. Preferably the angle is 70°.
- the invention further provides an expansion assembly of a rock bolt expansion assembly which includes: a joining ring; and a body which extends between a distal end and a proximal end and which comprises; a plurality of expansion leaves, each leaf having a body with a cylindrical outer surface formed with a plurality of serrations extending circumferentially around the outer surface, and a smooth tapered inner surface which, when the leaves are held together by the joining ring, provide a tapered passage which tapers inwardly from the distal end to the proximal end; wherein each serration is defined by a conical surface and an undercut surface which extends laterally relatively to the axis of the passage; and wherein the plurality of serrations includes a first series of serrations which starts adjacent the dis
- the lip may extend beyond the lateral extent of the serrations.
- the first range is between, and including, 0.5mm - 1 mm.
- each serration of the first series of serrations has an undercut surface with a uniform width.
- the second range is between, and including, 1 mm - 4mm.
- the conical surface and the undercut surface may intersect along an edge, through which a plane of orientation is defined, and the conical surface may intersect the plane in a range 60° - 80°. Preferably the angle is 70°.
- Figure 1 A and 1 B respectively isometrically illustrate a tapered plug and an expansion shell as components of the expansion assembly of the invention
- Figure 2 is a view in elevation of the expansion assembly, with the tapered plug engaged with the expansion shell;
- Figure 3 is a view in elevation of the expansion shell
- Figure 4 is an isometric sectioned illustration of a leaf of the expansion shell; and Figure 5 is a view in longitudinal section view of the tapered plug.
- Figure 1 illustrates, side by side, the components making up the expansion assembly 10 of the invention, the components including an expansion shell 12 and a tapered plug 14.
- the expansion shell has a generally cylindrical body 16 which extends between a distal end 18 and an opposed proximal end 20.
- the body is comprised of a pair of leaves, respectively designated 22A and 22B. It is anticipated, within the scope of the invention, that the body can have, for example, three or four leaves.
- the leaves (22) are connected, to provide the expansion shell, by joining rings 24 which fit within a complimentary arcuate groove 26 formed in an outer surface 28 of each leaf and running adjacent the proximal end.
- the joining rings are made of a suitable resiliently deformable material, such as for example rubber or spring steel, to allow a degree of expansionary flexibility when the expansion shell is caused to expand, in use, as will be more fully described below.
- each leaf (22A, 22B) is defined by the outer surface 28, which generally delimits a semi-cylinder, and a tapered, or at least partially tapered, smooth inner surface 30.
- the outer surface is formed with a plurality of serrations, respectively designated 32A, 32B, 32C...32F and 32G...32N on Figure 2, each of which extends circumferentially around the outer surface, parallel to one another and perpendicular to the longitudinal axis of the expansion shell 12.
- the leaves engage each other along respective parallel sides 33, as illustrated in Figure 1 , held together by the joining rings 24.
- a tapered passage 34 is created by the tapered inner surface 30 of each leaf 22.
- the passage tapers from the distal end 18 towards the proximal end 20.
- the inner surfaces 30 straighten towards the perpendicular, taking on a more cylindrical shape.
- the tapered plug 14 has an outer surface 36 which is tapered over a significant portion of its length. The taper angle of this portion is substantially complementary to the angle of taper of the passage 34. This is illustrated in Figure 2.
- a threaded bore 38 is formed through the tapered plug, the threads of which are adapted to threadedly engage with a threaded end of a rock bolt 40.
- the plurality of circumferential serrations 32 is divided into a first series of serrations, starting with serration 32A and, in this non-limiting example, ending with serration 32H, and a second series of serrations beginning with serration 321 and ending with serration 32M which lies adjacent the proximal end 20.
- Each serration is defined by a conical surface 42 and an undercut surface 44.
- the undercut surface can be a planar surface.
- the surface is slightly outwardly sloped by 10 Q from a planar surface.
- An edge 46 is defined along the line of intersection of the conical surface 42 with the undercut surface 44.
- the undercut surface extends laterally from, or substantially perpendicularly to the axis of, the passage, with each circumferential edge 46 lying in a plane of orientation which is parallel to the planes of orientation of adjacent edges.
- the conical surface 42 of each serration 32 slopes onto this plane of orientation at an angle between 60° and 80°, preferably 70°. This angle is illustrated in Figure 3 and designated a.
- each of the first series serrations is equidistant from edge- to-edge, a distance designated X on Figure 3, with the width of each undercut surface, designated ⁇ in an insert to Figure 3, being uniform.
- the edge-to-edge distance of each of these serrations (32I - 32M) and the width of the undercut surface are smaller.
- the edge-to-edge distance (X) progressively increases from the first serration of the series, i.e. serration 32I, to the last serration in the series, i.e. serration 32M.
- This also provides undercut surfaces with progressively increasing width ( ⁇ ) as the series advances towards the proximal end 20.
- each leaf 22 is provided with a chamfered lip 48, the edge of which extends beyond the lateral extent of the serrations at their respective edges
- the rock bolt is actuated in any manner to cause the tapered plug 14 to advance through the passage 34 towards the proximal end 20 to push the leaves (22) radially outwardly.
- the leaves pivot about the joining rings 24 when pushed outwardly, causing the leaves to part, and taking on the configuration of a segmented cone.
- This radial expansion causes the serrated outer surface 28 of each leaf 22 to contact with the walls of a rock hole, into which the rock bolt 40 is placed, to secure the rock bolt within the rock hole.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Dowels (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA201706290 | 2017-09-18 | ||
PCT/ZA2018/050051 WO2019056025A1 (en) | 2017-09-18 | 2018-09-03 | Expansion assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3685017A1 true EP3685017A1 (en) | 2020-07-29 |
Family
ID=63858230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18786655.3A Withdrawn EP3685017A1 (en) | 2017-09-18 | 2018-09-03 | Expansion assembly |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3685017A1 (en) |
CL (1) | CL2020000711A1 (en) |
PE (1) | PE20210850A1 (en) |
WO (1) | WO2019056025A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA870345A (en) * | 1971-05-11 | E. Reusser Hans | Bolt anchor and method of making same | |
CA668317A (en) * | 1963-08-06 | Hillberg Bror | Expansion bolt | |
KR100808849B1 (en) * | 2003-10-27 | 2008-03-03 | 아틀라스 코프코 마이 게엠베하 | Anchor device with an elastic expansion sleeve |
-
2018
- 2018-09-03 PE PE2020000696A patent/PE20210850A1/en unknown
- 2018-09-03 WO PCT/ZA2018/050051 patent/WO2019056025A1/en unknown
- 2018-09-03 EP EP18786655.3A patent/EP3685017A1/en not_active Withdrawn
-
2020
- 2020-03-18 CL CL2020000711A patent/CL2020000711A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019056025A1 (en) | 2019-03-21 |
CL2020000711A1 (en) | 2020-09-04 |
PE20210850A1 (en) | 2021-05-12 |
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Legal Events
Date | Code | Title | Description |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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STAA | Information on the status of an ep patent application or granted ep patent |
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17P | Request for examination filed |
Effective date: 20200318 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20220401 |