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Publication numberUS3896627 A
Publication typeGrant
Publication dateJul 29, 1975
Filing dateOct 23, 1973
Priority dateOct 18, 1974
Publication numberUS 3896627 A, US 3896627A, US-A-3896627, US3896627 A, US3896627A
InventorsBrown John Vincent
Original AssigneeFosroc Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Anchoring
US 3896627 A
Abstract
A plastics sleeve for use in holding a bolt in a borehole has a bore having two diameter portions, one wider than the other so that an internal shoulder is formed. A metal thread engaging means, such as a helically coiled spring wire, is inserted in the wider diameter portion to abut the shoulder. The threaded end of the bolt is passed through the narrower diameter portion and rotated to engage the metal thread engaging means. A cap, preferably holding a container of a self-setting mix, is fitted in the mouth of the wider diameter portion and the assembly then inserted in a borehole to rupture the container to release the composition to anchor the sleeve in the hole.
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Description  (OCR text may contain errors)

United States Patent Brown 1 July 29, 1975 1 1 ANCHORING 3,589,423 6/1971 Metz 85/32 cs Inventor: J Vincent Brown, n ugh, 3,702,060 11/1972 Cumming 61/45 B England FOREIGN PATENTS OR APPLICATIONS [73] Assignee. Fosmc Switzerland 1,268,624 6/1961 France 85/63 [22] Filed: Primary Examiner-Marion Parsons, Jr.

[2]] Appl. No.: 408,688

Foreign Application Priority Data Oct. 31, 1973 United Kingdom 50176/73 [52] U.S. Cl 61/45 B; 52/698; 85/61; 85/63 [51] Int. Cl E2ld 20/02 [58] Field of Search 85/35, 32 CS, 61, 62, 63; 61/45 B; 52/698 [56] References Cited UNlTED STATES PATENTS 2,022,946 12/1935 Staempfli 85/32 CS 2,570,003 10/1951 Palmer 85/87 2,829,502 4/1958 Dempsey 85/63 3,108,404 10/1963 Lamb 85/63 3,357,730 12/1967 Siler 85/61 Attorney, Agent, or Firm-Caesar, Rivise, Bernstein & Cohen [57] ABSTRACT A plastics sleeve for use in holding a bolt in a borehole has a bore having two diameter portions, one wider than the other so that an internal shoulder is formed. A metal thread engaging means, such as a helically coiled spring wire, is inserted in the wider diameter portion to abut the shoulder. The threaded end of the bolt is passed through the narrower diameter portion and rotated to engage the metal thread engaging means. A cap, preferably holding a container of a selfsetting mix, is fitted in the mouth of the wider diameter portion and the assembly then inserted in a borehole to rupture the container to release the composition to anchor the sleeve in the hole.

6 Claims, 3 Drawing Figures PATENTEU JUL29|975 SHEET ANCHORING' The invention relates to the fixing of a bolt or the like in a bore hole in a substrate, for example. the fixing of an anchor bolt in a hole in a mine gallery roof.

A device for the purpose specified, according to the invention, comprises a generally tubular sleeve. the bore of the sleeve comprising a major diameter portion and a minor diameter portion which, at their union, define a shoulder in the bore intermediate the ends of the sleeve, thread engaging means being located in the major diameter portion in abutment with the shoulder for engagement with the threaded end portion of a bolt received in the sleeve through the minor diameter portion, and a cap closing the mouth of the major diameter portion.

A preferred embodiment of the invention is described with reference to the accompanying drawings in which:

FIG. 1 is a sectional view of the device, a bolt to be anchored and a container holding a self-setting composition;

FIG. 2 is an exploded perspective view of the parts shown in FIG. 1; and

FIG. 3 is a sectional view showing a bolt secured in a hole by the device of FIG. 1.

The assembly of FIGS. 1 and 2 includes a tubular sleeve 1 molded of plastics material such as a polyacetal. DELRlN or a high molecular weight polyethylene. The exterior of the sleeve 1 has longitudinally spaced apart annular ridges 3. A metal collet 4 having peripherally projecting spokes 5 is located in a groove between adjacent ridges at one end, the lower as shown. At the upper end, the mouth of the sleeve is closed by a cap 6 having a lower part 7 which fits closely in the bore 8 of the sleeve 1. The cap 6 has a peripheral wall 9 providing a recess which receives and locates one end of a frangible container 2.

The container 2 holds a self-setting fixing composition. Preferably the composition comprises the interactive ingredients ofa self-setting polyester or epoxy resin mix. where required the interactive ingredients being kept separate from one another while the container remains intact. The material of which the container is made will depend on the nature of the composition; suitable materials for use with a polyester resin mix are unplasticized polyvinyl chloride and acrylonitrile butadiene styrene.

The bore 8 of the sleeve 1 comprises a lower portion 8-a of a relatively minor diameter and an upper portion 8-h of a relatively major diameter so that an annular shoulder 8-(' is formed in the interior wall of the sleeve intermediate its ends. The minor diameter portion 8-a may be about 5 mm less than the major diameter portion 8-b. A tubular metal screw thread forming element 10 fits within the larger diameter portion 8-h of the bore and has one end abutting the shoulder 8-('. This element comprises a length of spring wire coiled into a helix and having screw threads on its interior and exterior surfaces. Such elements are available commercially under the name HELlCOlL." The element 10 is inserted into the sleeve before the cap 6 is placed in position and rotated into engagement with a screw thread formed in the wall of the major diameter portion S-b. After the element 10 is received in the sleeve. a shear pin I1 is passed across the bore through the sleeve. The minor diameter portion 8-a of the sleeve is 'dimensionedsuch that a bolt 12 having a threaded end portion 13 may pass throughthe minor diameter portion to-engagethe element 10:

Toanc hor the bolt 12 in, for example, the roof of a mine gallery, a bore hole 14 (no.3) is made in the roof 15. For a bolt about l6.25"mm in diameter, the hole 14 is preferably about 36 mm in diameter. The bolt is inserted into the open end of the sleeve 1 and threaded into the element 10 until it engages the pin 11, the resistance then encountered indicating that the bolt is fully engaged with the element 10. The container 2 is placed in position on the cap 6 and the assembly is then pushed upward into the bore hole with container 2 leading. The assembly is hammered home to crush the container 2 so releasing its contents and inter-mixing them to form the self-setting mix and also urging the spokes 5 of the collet 4 into engagement with the wall of the bore hole 14. the self-setting mix 16 flows down the annular clearance between the sleeve 1 and the bore hole wall until it reaches the collet 4 which limits egress of the mix from the bore hole. The cap 6 prevents the mix from entering the bore 8 of the sleeve 1. The composition is preferably of a viscosity such that it flows to reach the collet 4 in seconds which means that the operator can then let go of the bolt 12 quickly and move on to the next hole. The bolt may be threaded fully home by applying a torque sufficient to shear the pin 11 and the bolt will then travel home a length dependent on that of the wider diameter portion 8-b generally about 4 or 5 cm.

The pull-out strength of the anchorage formed is enhanced by the shear strength of the engagement of the sleeve 1 with the element 10 and also the compressive strength of the material of the sleeve which lies outwardly of the shoulder 8-c. Because the bolt 12 and the screw thread 10 with which it engages are protected from contact with the set composition, the bolt can be withdrawn whenever desired.

Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current or future knowledge, readily adapt the same for use under various conditions of service.

What is claimed as the invention is:

l. A device for use in the fixing of a bolt or the like in a borehole, comprising a generally tubular sleeve including a bore and formed of a compressible plastic material, said sleeve being adapted to be anchored in the borehole by means of a self-setting composition released into location between the sleeve and the borehole wall, the bore of the sleeve comprising a major portion of a first predetermined diameter and a minor portion of a second, smaller, predetermined diameter, said bore portions forming a shoulder at their junction and intermediate the ends of the sleeve, said minor diameter portion including an open end to receive a threaded end portion of a bolt so that said bolt portion can extend therethrough, thread engaging means located in the major diameter portion and in abutment with the shoulder for engagement with the threaded end portion of the bolt extending through the minor diameter portion, and cap means sealing the major diameter portion of the bore to prevent the ingress of the self-setting mix therein upon its release to thereby preclude contact between said composition and the threaded end of the bolt extending into said major diameter portion.

5. A device according to claim 4 in which the means comprises a frangible pin extending across the bore of the sleeve between the cap of the major diameter portion and the adjacent end of the thread engaging means.

6, A device according to claim 1 in which the cap means is adapted to hold a frangible container of said self-setting composition.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2022946 *Jan 10, 1935Dec 3, 1935Joseph StaempfliBolt lock
US2570003 *Apr 6, 1950Oct 2, 1951Palmer Welloct Tool CorpExpansible sleeve anchoring device
US2829502 *Dec 17, 1953Apr 8, 1958Joseph B DempseyMine roof bolt installation
US3108404 *Jun 7, 1960Oct 29, 1963Lamb Lyle NAnchor device for hollow masonry type walls
US3357730 *Apr 29, 1963Dec 12, 1967Joseph T SilerMethods and means for parts assembly
US3589423 *Jun 10, 1969Jun 29, 1971Norco IncLocking-type machine nut
US3702060 *Feb 25, 1971Nov 7, 1972Cumming James DeansResin-bonded expansion shell
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4023373 *Jun 14, 1976May 17, 1977Union Forge, Inc.Anchor bolt assembly and utilization
US4051683 *Jun 28, 1976Oct 4, 1977Jennmar CorporationMethod and apparatus for supporting a mine roof
US4129007 *Aug 4, 1977Dec 12, 1978Celtite, Inc.Anchor device for resin anchor system
US4147458 *Jun 20, 1977Apr 3, 1979Elders G WRoof pin
US4160614 *Mar 23, 1978Jul 10, 1979Jennmar CorporationExpansion shell assembly and method for combining resin bonding and mechanical anchoring of a bolt in a rock formation
US4305687 *Jan 26, 1979Dec 15, 1981Jack ParkerAnchoring system for rock bolts
US4347020 *Jan 2, 1980Aug 31, 1982Birmingham Bolt CompanyMine roof bolt assembly
US4349299 *Jul 21, 1980Sep 14, 1982Stephen F. KovalRoof bolt tension head and method of use
US4413930 *Feb 27, 1981Nov 8, 1983Jennmar CorporationMethod and apparatus for combining resin bonding and mechanical anchoring of a bolt in a rock formation
US4516883 *Apr 1, 1983May 14, 1985Die-Matic CorporationMine roof bolt mounting assembly
US4655645 *Dec 31, 1984Apr 7, 1987H&S Machine & Supply Co., Inc.Method and apparatus for anchoring roof bolts
US4679966 *Sep 17, 1986Jul 14, 1987Jennmar CorporationRoof bolt apparatus with expansion shell and coupling
US4776143 *Jun 11, 1987Oct 11, 1988Ferdinand PointnerAnchor
US5033909 *Apr 27, 1990Jul 23, 1991Ingersoll-Rand CompanyCoupling for anchor rod and sleeve
US5052333 *Feb 23, 1987Oct 1, 1991Jacob WoudsmaPlug
US5073064 *Apr 27, 1990Dec 17, 1991Birmingham Bolt CompanyMethod and apparatus for retorquing an installed mine roof bolt
US5219248 *May 14, 1992Jun 15, 1993The Eastern CompanyMine roof expansion anchor with improved bore hole engagement means and method of installation thereof
US5344257 *Dec 2, 1992Sep 6, 1994The Eastern CompanyMine roof expansion anchor and bail element
US5653078 *Sep 29, 1995Aug 5, 1997Erico International CorporationVariable embedment anchor and method
US5785463 *Jan 11, 1996Jul 28, 1998Jennmar CorporationCombination cable bolt system
US5954455 *May 8, 1997Sep 21, 1999Jennmar CorporationCombination bolt system
US7896581 *Dec 2, 2005Mar 1, 2011Rhino Technologies LlcRe-tensionable cable bolt apparatus and related method
US8550751Aug 3, 2010Oct 8, 2013Dsi Underground Systems, Inc.Non-tensionable cable bolt apparatus and related method
EP0687821A1 *Jun 9, 1995Dec 20, 1995Illinois Tool Works Inc.Construction fastener assembly
EP0770785A1 *Oct 24, 1996May 2, 1997Illinois Tool Works Inc.Anchor dowell
Classifications
U.S. Classification405/259.6, 411/11, 411/15, 52/698, 405/259.2
International ClassificationE21D21/00, F16B13/00, F16B13/14
Cooperative ClassificationE21D21/0026, F16B13/141
European ClassificationE21D21/00M, F16B13/14C