US2570003A - Expansible sleeve anchoring device - Google Patents

Expansible sleeve anchoring device Download PDF

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Publication number
US2570003A
US2570003A US154297A US15429750A US2570003A US 2570003 A US2570003 A US 2570003A US 154297 A US154297 A US 154297A US 15429750 A US15429750 A US 15429750A US 2570003 A US2570003 A US 2570003A
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United States
Prior art keywords
sleeve
bore hole
ring
parts
expanding
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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.)
Expired - Lifetime
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US154297A
Inventor
John P Palmer
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PALMER WELLOCT TOOL Corp
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PALMER WELLOCT TOOL CORP
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Priority to US154297A priority Critical patent/US2570003A/en
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Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • F16B13/065—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 the screw, nail or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/918—Threadless nut

Definitions

  • This invention relates to expansible. sleeve anchoring devices and, more particularly, to improvements for holding together the parts of an expanding sleeve and for temporarily holding an expanding sleeve anchor in a bore hole.
  • the object of this invention is to provide an expanding sleeve anchor of the type wherein a hole is drilled into the formation in which anchorage is desired, and the anchor is loosely inserted in the bore hole and subsequently expanded into tight fitting engagement.
  • these anchors include two or more cooperating separabletparts which, together, constitute a sleeve.
  • An anchor bolt having an enlarged or tapered portion is engaged within the parts of the sleeve but with the enlargement lying outside the sleeve. This assembly is inserted in the bore hole and then the anchor is moved so as to force the enlargement between the sleeve parts, thereby expanding them between the material around the sides of the bore hole.
  • the object now is to provide, on the one hand, a device applicable to the sleeve parts for holding them temporarily together so that the sleeve parts can be identically formed, and so that the sleeve parts will expand uniformly.
  • Another object of the invention is to provide a clip for encircling the separable parts of an expanding sleeve and having projecting prongs or tabs for catching against the wall of a bore hole so that the assembly will not fall or otherwise come out of the bore hole prior to the expanding of the sleeve.
  • the invention is intended particularly for holding expanding sleeves temporarily together, and preliminarily in bore holes, as in a mine ceiling although it is obvious that this device will have utility in holding expanding sleeves in any position wherein accidental separation and dislodgement prior to anchoring is a problem.
  • Fig. l is a vertical elevation of the device, broken away in parts, and showing it in place in a vertical bore hole in a mine ceiling;
  • Fig. 2 is a plan View of the retainer ring
  • Fig. 3 is a side elevation of the retainer ring.
  • the invention is intended for use with a typical anchor assembly including an expanding sleeve indicated generally at 2 which initially fits loosely over the straight shank of an anchor bolt 4 and is inserted with the bolt in a bore hole 6.
  • bore hole 6 extends vertically upward in the rock ceiling of a mine.
  • an enlarged tapered head 8 which, initially lies outside sleeve 2 but, when drawn within the sleeve, expands the two identical sleeve halves l0, l0 away from one. another to force the roughened portions l2 against the sides of the bore hole, thereby preventing withdrawal of the assembly.
  • the invention is concerned particularly with the lower body portions of sleeve halves l0, 10, it being apparent from the drawing that lower body portions, aswell as the remainder of the sleeve halves, are formed identical with one another and with circumferential grooves I8 near the lower end. Grooves [8 match with one another so as to form an annular recess for receiving and elastic rubber ring 20.
  • recess N3 By the provisions of recess N3, the location of ring 20 is pre-determined and, in addition the ring is seated somewhat inwardly from the position it would occupy if engaged around the exterior of lower body portions 15 so as to avoid dislodgement of the ring during the insertion of the sleeve into the bore hole 6.
  • rubber ring 2 permits uniform separation of the sleeve halves l0, l0.
  • one of the sleeve halves is provided with projecting prongs bent around to embrace the other sleeve half.
  • the other sleeve half is either recessed to recline the prongs, in which case the recessed half bends more easily than the prong-carrying half, or the prongs lie exteriorly of the side wall of the embraced sleeve half.
  • the halves tend to slide with respect to one another and the prongs prevent pivot-like obstructions about which at least one of the halves tends to bend.
  • Identical sleeve halves ID, ID react symmetrically to all expanding forces and, at least initially tend to pivot apart about an axis at their bottoms as a result of the constraint of ring 24 described below.
  • Fig. 1 Attention is directed now particularly to Fig. 1, wherein it is apparent that the lower ends of sleeve halves ll], H) are reduced to form an annular ledge 22 around which is fitted an annular ring 24, preferably formed of spring metal and having a plurality of tabs 26 projecting from the outer periphery.
  • the inner periphery of ring 24 is slotted, at intervals indicated at 25, and bent downwardly to form spring lugs 21 which tightly grip ledge 22 and hold the ring in place.
  • Tabs 26 are bent down and ring 24 is fitted around ledge 22 so that the tabs 26 trail rearwardly when the assembly is inserted in bore hole 6.
  • An enlargement'28 should be welded or staked on the side of anchor bolt l, to keep sleeve 2 from sliding back when the assembly is extended upwardly.
  • tabs 26 project outwardly from the outermost margins of sleeve 2 so that, with the first tendency towards retrograde movement of the assembly from the borehole 6, tabs 26 catch against and dig into the material around the side of the bore hole, thereby holding the assembly in place until anchor bolt 4 can be pulled to expand the sleeve 2 permanently in position, whereupon sleeve halves IE3, l0 spread uniformly outwardly to engage their roughened exteriors I2 into the sides of bore hole 6.
  • Ifian-expaiisible-sleeveanchondevice adapted to be inserted into. 'a-b'or e hole, a plurality of substantially identical sleeve parts arcuate in cross-section-aiidadapted to form a longitudinal- 1y separable sleeve forjuxt'a'position around an expanding member, each of said sleeve parts having a roughened exteiior portion extending longitudinally along a part of its length adjacent one end thereof, whereby to'eiig age one end of said sleeve partswith the side walls of a bore hole when 'said-sl'eve i's "xpar ided therein, said sleeve partsbeing reduced in diameterat the other end thereof anda jng secured on the reduced portions ve part said rin being formed or n tal and-having outer peripheral projecyierig extriorly of said'sleeve whenthe lat- [not expanded,
  • said ring having a substantially annular body formed of spring metal, said outer peripheral projections comprising prongs integral with said body and bent from the radial plane thereof in a direction generally opposite to the direction of insertion of said sleeve in said bore hole.
  • An expansible sleeve anchor device comprising a plurality of sleeve partsarcuate in cross-section and adapted to cooperate with one another to form a longitudinally separable sleeve for juxtaposition around an anchor bolt or the like expanding member having an enlargement thereon at one end whereby, upon axial movement of the enlargement with respect to the sleeve, to separate the sleeve parts at one end of said device and thereby expand the sleeve into a bore hole, each of said sleeve parts having a ledge thereon adjacent the other ends thereof and lying interiorly of the outer. periphery thereof whereby, whenvsaid parts.

Description

Oct. 2, 1951 J. P. PALMER INVENTOR JOHN R PALMER I 6 ATTORNEY Filed April 6, 1950 EXPANSIBLE SLEEVE ANCHORING DEVICE u nnr .0
Patented Oct. 2, 1951 EXPANSIBLE SLEEVE ANCHORIN G DEVICE John P. Palmer, Meadville, Pa., assignor to The Palmer Welloct Tool Corporation, Meadville, Pa., a corporation of Fennsylvania Application April 6, 1950, Serial No. 154,297
3 Claims.
This invention relates to expansible. sleeve anchoring devices and, more particularly, to improvements for holding together the parts of an expanding sleeve and for temporarily holding an expanding sleeve anchor in a bore hole.
The object of this invention is to provide an expanding sleeve anchor of the type wherein a hole is drilled into the formation in which anchorage is desired, and the anchor is loosely inserted in the bore hole and subsequently expanded into tight fitting engagement. Conventionally these anchors include two or more cooperating separabletparts which, together, constitute a sleeve. An anchor bolt having an enlarged or tapered portion is engaged within the parts of the sleeve but with the enlargement lying outside the sleeve. This assembly is inserted in the bore hole and then the anchor is moved so as to force the enlargement between the sleeve parts, thereby expanding them between the material around the sides of the bore hole. Usually one of the sleeve parts is provided with tabs or extensions which embrace the other part for holding the sleeve assembly together prior to expansion. The object now is to provide, on the one hand, a device applicable to the sleeve parts for holding them temporarily together so that the sleeve parts can be identically formed, and so that the sleeve parts will expand uniformly.
Another object of the invention is to provide a clip for encircling the separable parts of an expanding sleeve and having projecting prongs or tabs for catching against the wall of a bore hole so that the assembly will not fall or otherwise come out of the bore hole prior to the expanding of the sleeve. Thus the invention is intended particularly for holding expanding sleeves temporarily together, and preliminarily in bore holes, as in a mine ceiling although it is obvious that this device will have utility in holding expanding sleeves in any position wherein accidental separation and dislodgement prior to anchoring is a problem.
These and other objects will be apparent from the following specification and drawings, in which:
Fig. l is a vertical elevation of the device, broken away in parts, and showing it in place in a vertical bore hole in a mine ceiling;
Fig. 2 is a plan View of the retainer ring; and
Fig. 3 is a side elevation of the retainer ring.
Referring now to the drawing in which like reference numerals denote similar elements, the invention is intended for use with a typical anchor assembly including an expanding sleeve indicated generally at 2 which initially fits loosely over the straight shank of an anchor bolt 4 and is inserted with the bolt in a bore hole 6. In this example it will be assumed that bore hole 6 extends vertically upward in the rock ceiling of a mine. Usually on the upper end of anchor bolt 4 there is an enlarged tapered head 8 which, initially lies outside sleeve 2 but, when drawn within the sleeve, expands the two identical sleeve halves l0, l0 away from one. another to force the roughened portions l2 against the sides of the bore hole, thereby preventing withdrawal of the assembly. I
The invention is concerned particularly with the lower body portions of sleeve halves l0, 10, it being apparent from the drawing that lower body portions, aswell as the remainder of the sleeve halves, are formed identical with one another and with circumferential grooves I8 near the lower end. Grooves [8 match with one another so as to form an annular recess for receiving and elastic rubber ring 20. By the provisions of recess N3, the location of ring 20 is pre-determined and, in addition the ring is seated somewhat inwardly from the position it would occupy if engaged around the exterior of lower body portions 15 so as to avoid dislodgement of the ring during the insertion of the sleeve into the bore hole 6. When head 8 is drawn into the sleeve, rubber ring 2!! permits uniform separation of the sleeve halves l0, l0.
Ordinarily, in the proximity of grooves I8, one of the sleeve halves is provided with projecting prongs bent around to embrace the other sleeve half. The other sleeve half is either recessed to recline the prongs, in which case the recessed half bends more easily than the prong-carrying half, or the prongs lie exteriorly of the side wall of the embraced sleeve half. In this latter case the halves tend to slide with respect to one another and the prongs prevent pivot-like obstructions about which at least one of the halves tends to bend. Identical sleeve halves ID, ID, however, react symmetrically to all expanding forces and, at least initially tend to pivot apart about an axis at their bottoms as a result of the constraint of ring 24 described below.
Attention is directed now particularly to Fig. 1, wherein it is apparent that the lower ends of sleeve halves ll], H) are reduced to form an annular ledge 22 around which is fitted an annular ring 24, preferably formed of spring metal and having a plurality of tabs 26 projecting from the outer periphery. The inner periphery of ring 24 is slotted, at intervals indicated at 25, and bent downwardly to form spring lugs 21 which tightly grip ledge 22 and hold the ring in place. Tabs 26 are bent down and ring 24 is fitted around ledge 22 so that the tabs 26 trail rearwardly when the assembly is inserted in bore hole 6. An enlargement'28 should be welded or staked on the side of anchor bolt l, to keep sleeve 2 from sliding back when the assembly is extended upwardly. When completely extended, tabs 26 project outwardly from the outermost margins of sleeve 2 so that, with the first tendency towards retrograde movement of the assembly from the borehole 6, tabs 26 catch against and dig into the material around the side of the bore hole, thereby holding the assembly in place until anchor bolt 4 can be pulled to expand the sleeve 2 permanently in position, whereupon sleeve halves IE3, l0 spread uniformly outwardly to engage their roughened exteriors I2 into the sides of bore hole 6.
Isis-apparent that. the various modifications and substitutions of materials may be made for theelementsdetailed above, and that the invention is limitedonlybythe following claims.
'rna m:
l. Ifian-expaiisible-sleeveanchondevice adapted to be inserted into. 'a-b'or e hole, a plurality of substantially identical sleeve parts arcuate in cross-section-aiidadapted to form a longitudinal- 1y separable sleeve forjuxt'a'position around an expanding member, each of said sleeve parts having a roughened exteiior portion extending longitudinally along a part of its length adjacent one end thereof, whereby to'eiig age one end of said sleeve partswith the side walls of a bore hole when 'said-sl'eve i's "xpar ided therein, said sleeve partsbeing reduced in diameterat the other end thereof anda jng secured on the reduced portions ve part said rin being formed or n tal and-having outer peripheral projecyiriig extriorly of said'sleeve whenthe lat- [not expanded, whereby upon insertion of l e in ajborehol, to engage the side walls ole and hold said sleeve temporarily ace i ftil the latter expanded, said ring a, ntly engaging and--constricting the sleeve parts whereby resiliently to hold the latter-to e r a aid othe 1 7 ienna tions 1 2. The combination claimed in claim 1, said ring having a substantially annular body formed of spring metal, said outer peripheral projections comprising prongs integral with said body and bent from the radial plane thereof in a direction generally opposite to the direction of insertion of said sleeve in said bore hole.
3; An expansible sleeve anchor device comprising a plurality of sleeve partsarcuate in cross-section and adapted to cooperate with one another to form a longitudinally separable sleeve for juxtaposition around an anchor bolt or the like expanding member having an enlargement thereon at one end whereby, upon axial movement of the enlargement with respect to the sleeve, to separate the sleeve parts at one end of said device and thereby expand the sleeve into a bore hole, each of said sleeve parts having a ledge thereon adjacent the other ends thereof and lying interiorly of the outer. periphery thereof whereby, whenvsaid parts. arejuxtaposed, to form an-annular seat atv said other end of said device, a ring fitting around. saidrseat, prongsonsaid ring extending outwardly fromthe adjacent peripheral limits of said sleevewhereby upon insertion. of said device in aborehole, to engage the side walls of s'aid bore holeand hold said device temporarily in place, and spring lugs, onsaid ring extending inwardly against thetperiphery of, said annular seat whereby yieldingly to hold: the sleeve parts together at said other end of said device.
JOHN P. PALMER.
anrnnnNoEs crrnp v The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 750,536 Haggerty Jan-."26, 1904 895,756 r Eleister Aug; 25, 1908 1,349,213? Royer Aug. 10, 1920 1,361,335; Devlin Dec. 14:, 1920 1,976,193, Steenrod Oct, 9, 1934 2,399,069- Y Skinner Apr; 23, 1946-
US154297A 1950-04-06 1950-04-06 Expansible sleeve anchoring device Expired - Lifetime US2570003A (en)

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE917542C (en) * 1951-10-23 1954-09-06 Gutehoffnungshuette Sterkrade Rod-shaped, helically twisted rock anchor
US2709470A (en) * 1951-06-14 1955-05-31 Illinois Tool Works Screw and washer assembly
US2787931A (en) * 1953-05-29 1957-04-09 Republic Steel Corp Mine roof bolts with multiple piece shell having u-shaped spring holding means
DE962602C (en) * 1954-04-16 1957-04-25 Froelich & Kluepfel Maschinenf Robust rock anchor for longwall or road construction
US2832253A (en) * 1952-03-01 1958-04-29 Allimann Georges Expansion bolt having expanding jaws secured to elastic cup-shaped member
US2849866A (en) * 1952-10-18 1958-09-02 Flygare Adolf Fredrik Roof-bolting
US2952129A (en) * 1958-01-09 1960-09-13 Joseph B Dempsey Mine roof bolt installation
US2967042A (en) * 1958-04-24 1961-01-03 Herbert M Richter Stop valve
DE1143772B (en) * 1961-07-21 1963-02-21 Heinz Goldau Expanding sleeve anchor for mining operations
US3082657A (en) * 1956-09-20 1963-03-26 Fischer Artur Expansion bolt having longitudinal slits initially sealed by frangible webs
US3087308A (en) * 1957-08-26 1963-04-30 Raymond Int Inc Method of installing piles for resisting upward soil movements
US3148577A (en) * 1962-02-27 1964-09-15 Edward W Parsons Rock bolt anchored by explosive forming
US3171322A (en) * 1962-08-28 1965-03-02 Kaplan Stanley Anchor bolt
US3226934A (en) * 1961-05-16 1966-01-04 C I M Consultants Ltd Rock bolts
US3296919A (en) * 1964-10-26 1967-01-10 Chester I Williams Retaining device for rock bolts
US3379019A (en) * 1965-05-03 1968-04-23 Chester I. Williams Rock bolt assembly for upgrouting operations
US3498650A (en) * 1968-03-06 1970-03-03 Tinnerman Products Inc Fastening device
US3527120A (en) * 1968-07-01 1970-09-08 Gen Motors Corp Differential assembly and axle shaft retainer therefor
US3699687A (en) * 1969-02-10 1972-10-24 Celtite Sa Arrangements for anchoring supporting pins or bolts
US3754401A (en) * 1971-12-29 1973-08-28 J Lipow Earth anchor
US3896627A (en) * 1974-10-18 1975-07-29 Fosroc Ag Anchoring
US4382719A (en) * 1981-03-27 1983-05-10 Scott James J Methods of reinforcing and stabilizing an earth structure, and a stabilizer set therefor
US4861198A (en) * 1988-11-22 1989-08-29 Jennmar Corporation Expansion assembly for mine roof bolts
US5009549A (en) * 1988-11-22 1991-04-23 Jennmar Corporation Expansion assembly for mine roof bolts
WO1996007016A1 (en) * 1994-08-29 1996-03-07 Scott Smith Philip Anthony Split-lock bar
WO2015189818A1 (en) * 2014-06-13 2015-12-17 Skema Mining Components (Pty) Ltd Combination roof bolt
US9562558B2 (en) 2014-08-21 2017-02-07 Precision Tower Products, Llc Blind fastener
US10030380B2 (en) * 2015-11-20 2018-07-24 ToolTech, LLC Concrete slab anchor
US11732740B2 (en) 2020-05-12 2023-08-22 Sky Climber Fasteners LLC Blind fastener

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US750536A (en) * 1904-01-26 Expansion-bolt
US896756A (en) * 1907-12-19 1908-08-25 Henry B Newhall Expansion bolt-anchor.
US1349437A (en) * 1919-04-24 1920-08-10 Bernard J Boyle Expansion-bolt
US1361836A (en) * 1917-09-28 1920-12-14 Devlin Thomas Frank Expansion-bolt
US1976198A (en) * 1931-03-06 1934-10-09 Remington Rand Inc Loose leaf binder
US2133871A (en) * 1937-02-27 1938-10-18 Yankee Metal Products Corp Fender guide
US2399069A (en) * 1945-04-20 1946-04-23 Roberts K Skinner Bolt anchor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US750536A (en) * 1904-01-26 Expansion-bolt
US896756A (en) * 1907-12-19 1908-08-25 Henry B Newhall Expansion bolt-anchor.
US1361836A (en) * 1917-09-28 1920-12-14 Devlin Thomas Frank Expansion-bolt
US1349437A (en) * 1919-04-24 1920-08-10 Bernard J Boyle Expansion-bolt
US1976198A (en) * 1931-03-06 1934-10-09 Remington Rand Inc Loose leaf binder
US2133871A (en) * 1937-02-27 1938-10-18 Yankee Metal Products Corp Fender guide
US2399069A (en) * 1945-04-20 1946-04-23 Roberts K Skinner Bolt anchor

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709470A (en) * 1951-06-14 1955-05-31 Illinois Tool Works Screw and washer assembly
DE917542C (en) * 1951-10-23 1954-09-06 Gutehoffnungshuette Sterkrade Rod-shaped, helically twisted rock anchor
US2832253A (en) * 1952-03-01 1958-04-29 Allimann Georges Expansion bolt having expanding jaws secured to elastic cup-shaped member
US2849866A (en) * 1952-10-18 1958-09-02 Flygare Adolf Fredrik Roof-bolting
US2787931A (en) * 1953-05-29 1957-04-09 Republic Steel Corp Mine roof bolts with multiple piece shell having u-shaped spring holding means
DE962602C (en) * 1954-04-16 1957-04-25 Froelich & Kluepfel Maschinenf Robust rock anchor for longwall or road construction
US3082657A (en) * 1956-09-20 1963-03-26 Fischer Artur Expansion bolt having longitudinal slits initially sealed by frangible webs
US3087308A (en) * 1957-08-26 1963-04-30 Raymond Int Inc Method of installing piles for resisting upward soil movements
US2952129A (en) * 1958-01-09 1960-09-13 Joseph B Dempsey Mine roof bolt installation
US2967042A (en) * 1958-04-24 1961-01-03 Herbert M Richter Stop valve
US3226934A (en) * 1961-05-16 1966-01-04 C I M Consultants Ltd Rock bolts
DE1143772B (en) * 1961-07-21 1963-02-21 Heinz Goldau Expanding sleeve anchor for mining operations
US3148577A (en) * 1962-02-27 1964-09-15 Edward W Parsons Rock bolt anchored by explosive forming
US3171322A (en) * 1962-08-28 1965-03-02 Kaplan Stanley Anchor bolt
US3296919A (en) * 1964-10-26 1967-01-10 Chester I Williams Retaining device for rock bolts
US3379019A (en) * 1965-05-03 1968-04-23 Chester I. Williams Rock bolt assembly for upgrouting operations
US3498650A (en) * 1968-03-06 1970-03-03 Tinnerman Products Inc Fastening device
US3527120A (en) * 1968-07-01 1970-09-08 Gen Motors Corp Differential assembly and axle shaft retainer therefor
US3699687A (en) * 1969-02-10 1972-10-24 Celtite Sa Arrangements for anchoring supporting pins or bolts
US3754401A (en) * 1971-12-29 1973-08-28 J Lipow Earth anchor
US3896627A (en) * 1974-10-18 1975-07-29 Fosroc Ag Anchoring
US4382719A (en) * 1981-03-27 1983-05-10 Scott James J Methods of reinforcing and stabilizing an earth structure, and a stabilizer set therefor
EP0370754A3 (en) * 1988-11-22 1991-09-25 Jennmar Corporation Expansion assembly for mine roof bolts
EP0370754A2 (en) * 1988-11-22 1990-05-30 Jennmar Corporation Expansion assembly for mine roof bolts
US5009549A (en) * 1988-11-22 1991-04-23 Jennmar Corporation Expansion assembly for mine roof bolts
US4861198A (en) * 1988-11-22 1989-08-29 Jennmar Corporation Expansion assembly for mine roof bolts
WO1996007016A1 (en) * 1994-08-29 1996-03-07 Scott Smith Philip Anthony Split-lock bar
WO2015189818A1 (en) * 2014-06-13 2015-12-17 Skema Mining Components (Pty) Ltd Combination roof bolt
US9562558B2 (en) 2014-08-21 2017-02-07 Precision Tower Products, Llc Blind fastener
US9581185B2 (en) 2014-08-21 2017-02-28 Precision Tower Products, Llc Blind fastener
US10190617B2 (en) 2014-08-21 2019-01-29 Precision Tower Products Blind fastener
US10767677B2 (en) 2014-08-21 2020-09-08 Sky Climber Tower Solutions Llc Blind fastener
US10030380B2 (en) * 2015-11-20 2018-07-24 ToolTech, LLC Concrete slab anchor
US11732740B2 (en) 2020-05-12 2023-08-22 Sky Climber Fasteners LLC Blind fastener

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