US3025742A - Anchor bolt comprising separate shells having inclined ramp surfaces to be expanded by a wedge-shaped block drawn therebetween - Google Patents

Anchor bolt comprising separate shells having inclined ramp surfaces to be expanded by a wedge-shaped block drawn therebetween Download PDF

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Publication number
US3025742A
US3025742A US725838A US72583858A US3025742A US 3025742 A US3025742 A US 3025742A US 725838 A US725838 A US 725838A US 72583858 A US72583858 A US 72583858A US 3025742 A US3025742 A US 3025742A
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United States
Prior art keywords
shells
rod
cams
nut
block
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Expired - Lifetime
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US725838A
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English (en)
Inventor
Lemoine Marcel Camille Jean
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Anciens Etablissements Goldenberg et Cie
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Anciens Etablissements Goldenberg et Cie
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    • 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
    • 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

Definitions

  • the present invention relates toanchoring devices, and in particular anchoring devices of the type comprising a traction rod provided with one or more groups of cams co-operating with corresponding groups of ramps provided on shells applied around the rod.
  • anchoring devices are used for many purposes and in particular for setting objects in walls, bedding down machines, and for any application in which an object is held fast in material in which it is possible to make a hole. These devices are mostly used in mines for bolting roofing, facings and the wall.
  • the object of the invention is to provide an anchoring device of the aforementioned type which remedies this disadvantage and provides further advantages.
  • the anchoring device of the invention is characterised in that one of the groups of cams is constituted by an apertured block in the aperture of which are inserted guide means protruding from the inner face of the shells.
  • these guide means could be utilized as a support for connecting means which interconnects the shells and extends through said aperture.
  • the aperture in the block is defined at its upper part by a wall which in contacting the guide means or the connecting means prevents separation of the shells and of the block.
  • the connecting means is constituted by a rigid pin, such as a rivet, slidably mounted in the guide means and permitting the transverse separation of the shells while preventing relative longitudinal movement between said shells.
  • FIG. 1 is a perspective view with a part cut away of one embodiment of the invention
  • FIG. 2 is a longitudinal sectional view with a part cut away of a second embodiment of the invention.
  • FIG. 3 is a sectional view taken along line 33 of FIG. 6;
  • FIG. 4 is a longitudinal sectional view taken along line 44 of FIG. 6 of the first embodiment of the invention.
  • FIG. is a partial longitudinal sectional view of a detail of the embodiment shown in H6. 1, and
  • FIGS. 6, 7 and 8 are longitudinal sectional views of three stages of expansion of the anchoring device shown in FIG. 1.
  • the anchoring device comprises two shells 1 and 2 which constitute by their adjacent relationship a segmented tube.
  • These shells comprise notches or recesses 3 on their outer face, adapted to facilitate the anchoring of the shells in the wall of the bored hole and are provided at their lower part with longitudinally-extending slots 4 the purpose of which will be described hereinafter.
  • the segmented tube formed by the shells 1 and 2 encompasses a traction rod 5 carrying a group of cams A.
  • this group of cams is formed by a block in the form of a wedge defined by two lateral opposed faces 6 interconnected at their upper part by a bridge 7.
  • the space 8 between the two faces 6 is apertured forming two thin walls or strips 9 corresponding to the faces 6 of the block A.
  • these strips 9 constitute the cam faces of the block A and cooperate with similarly inclined ramps 19 formed at the joints of the shells 1 and 2.
  • each of the shells comprises a projection or boss 11 (FIGS. 1 and 3) adapted to extend into the aperture 8 and'thus constitute guide means for the shells.
  • the bosses 11 are provided with apertures 12 in which is slidably mounted a pin or rivet 13 which is burred or riveted over at each end 14.
  • This pin interconnects the shells 1 and 2 through the aperture 3 and thus permits the shells to separate transversely of the anchoring device While preventing relative longitudinal movement between the shells.
  • elastically yieldable connecting means 15 bearing in one of the notches 3 or in a recess provided for this purpose in the outer face of the shells, apply the shells against the cams A.
  • the rod 5 is connected to the cam block A by a second block or wedge 16 (FIG. 4).
  • This block is provided with a tapped hole 17 at its upper part and receives the screw-threaded end 18 of the rod 5.
  • a stud 19 is screwthreadedly engaged in the end 18 of the rod 5 and comprises at its upper end an abutment head 29.
  • the hollow block 16 is in the form of a truncated pyramid Whose lateral faces 21 constitute the second group of cams co-operating with similarly inclined ramps 22 provided in the inner face of the shells on either side of the longitudinal slot 4.
  • the lower end of the rod 5 carries a nut 23 which is engaged on the lower screw-threaded end portion 24 of the rod and retains a support plate 26.
  • Th nut 23 is arranged in a special manner as shown in FIG. 5. It is not completely tapped, its lower part 27 being unfinished in that its diameter corresponds to the diameter of the hole drilled prior to tapping the nut.
  • FIG. 1 there are provided two groups of cams constituted respectively by the faces 9 of the block A and the faces 21 of the block 16.
  • the faces of the cam 9 effect a diametral expansion of the upper part of the shells and the faces 21 effect a circumferential expansion of the lower part of the shells, permitted by the slots 4.
  • the operation and the advantages of these two groups of cams arranged in this manner are described in detail in applicants co-pending patent application Serial No. 725,845 filed on the same day as the present application and entitled Anchoring Device.
  • the cams should be arranged in the manner shown in FIG. 1.
  • the traction rod carry at least one group of cams constituted by an apertured :block in the aperture of which extend the guide means protruding from the inner faces of the shells.
  • FIG. 2 there has been shown an embodiment of the anchoring device which is identical to that shown in FIG. 1 except that the block 16a is cylindrical and has no cam face, the only cams being those of the block A which are longer than those shown in FIG. 1. Consequently, the lower parts of the shells have no longitudinal slots 4.
  • a group of cams such as the group A
  • the group of cams A could then constitute the upper or lower group of cams of the rod or an intermediate group located between two other groups.
  • FIG. 6 the anchoring device has just been inserted in the bored hole T. Owing to the force of gravity or a manual traction, the rod and its groups of cams have descended slightly and slightly opened the shells 1 and 2. This ensures that the shells anchor or hook in the wall of the bored hole which hooking is favored by the recesses 3.
  • the rod 5 has not been screwed sufficiently into the block 16 to permit the head 20 of the stud 19 to abut the guide means 11.
  • the second stage of anchoring consists in driving the rod 5 in rotation by means of the nut 23 which is wedged against the end of the screw-threaded portion 24 of the rod.
  • the rod 5 screws into the block 16 and the cam remains stationary until the head 20 abuts the lateral face of the guide means 11 (FIG. 7). Thenceforth, further rotation of the rod, which cannot move longitudinally, causes a downward movement of the block 16 and of the cam block A rigid therewith.
  • the bosses 11 guide the downward movement of the group of cams A and thus prevent any relative rotation between, on one hand, the unit comprising the rod 5 and the cams 9 and 21 carried thereby and the shells on the other.
  • the bosses 11 slide transversely along the pin 13 so that the latter does not hinder the expansion.
  • the pin prevents any longitudinal relative movement between the shells.
  • the rotation of the rod 5 encounters an increasing resistance due to the resistance of the surrounding material or earth with increased separation of the shells.
  • FIG. 8 represents the last stage of anchoring, that the head 20 has left the lower face of the guide means 11 and that the nut 23 has been screwed along the screw-threaded portion 24 of the rod i 5.
  • the expansion of the anchoring device is terminated when the bridge 7 of the block A abuts the upper face of the guide means 11, as shown in FIG. 8.
  • guide means 11 ensure a correct positioning of the cams and ramps during the whole of the expansion. They permit moreover a positive connection between the shells by means of the pin 13. Further, the abutment of the head 26 against the guide means determines the expansion of the anchoring device, this expansion being limited by the abutment of the bridge 7 against the same guide means.
  • the apertured block A with one or more other groups of cams or it can be the only group of cams.
  • the nut 23 could be held rigid with the rod 5 as concerns rotation up to a predetermined rotational force by means other than that shown in FIG. 5.
  • this nut 23 could be provided with a pin which extends therethrough and through the rod 5 and shears upon application of a pre-determined rotational force. It is also possible to construct the nut 23 so that it has a blind. tapped hole the base of this nut shearing upon application of a predetermined rotational force.
  • Anchoring device comprising separate shells assembled so as to form a segmented tube and provided with at least one group of inclined surfaces forming ramps, a rod longitudinally disposed in said tube, at least one group of inclined surfaces providing cams formed on a wedge-shaped block which has a transverse aperture, said block being carried by one end of said rod, and longitudinally movable therewith relative to said shells when a traction is exerted on said rod, said group of cams being adapted, when moving relative to said shells, to co operate with said group of ramps so as to effect an expansion of said shells, the latter further comprising guide and connecting means constituted by hollow projections having a transverse base extending from the inner face of said shells radially relative to said tube and protruding into said aperture and an element extending through said transverse bases and having headed ends normally spaced from said bases and positioned in said hollow projections without projecting externally of the shells and extending through said aperture, the other end of said rod comprising means for exerting a traction on
  • Anchoring device comprising separate shells assembled so as to form a segmented tube and provided with at least one group of inclined surfaces forming ramps, a rod longitudinaily disposed in said tube, at least one group of inclined surfaces providing cams formed on a wedgeshaped block which has a transverse aperture, one end of said rod being screw-threaded and screw-threadedly engaged in a threaded opening at the smaller end of said wedge block, whereby said block is mounted on said rod and longitudinally movable relative to the latter and to said shells, said group of cams being adapted, when moving relative to said shells, to co-operate with said group of ramps so as to effect an expansion of said shells, the latter further comprising guide and connecting means constituted by projections having a transverse base extending from the inner face of said shells radially relative to said tube and protruding into said aperture, said rod being capable of protruding longitudinally at one of its ends into said aperture and bearing against said guide and connecting means, the other end of said rod
  • Anchoring device comprising separate shells assembled so as to form a segmented tube and provided with at least one group of inclined surfaces forming ramps, a rod longitudinally disposed in said tube, at least one group of inclined surfaces providing cams formed on a wedgeshaped block which has a transverse aperture, one end of said rod being screw-threaded and screw-threadedly engaged in a threaded opening at the smaller end of said wedge block, whereby said block is mounted on said rod and longitudinally movable relative to the latter and to said shells, said group of cams being adapted, when moving relative to said shells, to co-operate with said group of ramps so as to effect an expansion of said shells, the latter further comprising guide means constituted by projections having a transverse base extending from the inner face of said shells radially relative to said tube and protruding into said aperture, said rod being capable of protruding longitudinally at one of its ends into said aperture and bearing against said guide means, the other end of said rod being screw-threaded,
  • Anchoring device comprising separate shells assembled so as to form a segmented tube and provided with at least one group of inclined surfaces forming ramps, a rod longitudinally disposed in said tube, at least one group of inclined surfaces providing cams formed on a wedgeshaped block which has a transverse aperture, one end of said rod being screw-threaded and screw-threadedly engaged in a threaded opening at the smaller end of said Wedge block, whereby said block is mounted on said rod and longitudinally movable relative to the latter and to said shells, said group of cams being adapted, when moving relative to said shells, to co-operate with said group of ramps so as to effect an expansion of said shells, the
  • latter further comprising guide and connecting means constituted by hollow projections having a transverse base extending from the inner face of said shells radially relative to said tube and protruding into said aperture and an element extending through said transverse bases and having headed ends normally spaced from said bases and positioned in said hollow projections without projecting externally of the shells and extending through said aperture, said rod being capable of protruding longitudinally at one of its ends into said aperture and bearing against said guide and connecting means, the other end of said rod being screw-threaded, a nut engaged on said other rod end, the thread of said nut being incomplete, whereby when said rod bears against said guide and connecting means said nut thread will be completed by said rod thread and said nut will move said rod and wedge relative to said tube to further expand it.
  • guide and connecting means constituted by hollow projections having a transverse base extending from the inner face of said shells radially relative to said tube and protruding into said aperture and an element extending through said transverse bases and having headed ends normally spaced from
  • Anchoring device as claimed in claim 4, wherein said one end of said rod comprises a longitudinal extension, whose length is adjustable and through which said one end of said rod is capable of bearing against said guide and connecting means.
  • Anchoring device as claimed in claim 5, wherein one end of said longitudinal extension is screw-threaded and screw-threadedly engaged in a threaded opening at said one end of said rod.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)
  • Piles And Underground Anchors (AREA)
US725838A 1957-04-19 1958-04-02 Anchor bolt comprising separate shells having inclined ramp surfaces to be expanded by a wedge-shaped block drawn therebetween Expired - Lifetime US3025742A (en)

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FR3025742X 1957-04-19

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US3025742A true US3025742A (en) 1962-03-20

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US (1) US3025742A (US07122603-20061017-C00045.png)
BE (1) BE566098A (US07122603-20061017-C00045.png)
DE (1) DE1107170B (US07122603-20061017-C00045.png)
LU (1) LU36003A1 (US07122603-20061017-C00045.png)
NL (2) NL102769C (US07122603-20061017-C00045.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840610A (zh) * 2016-05-11 2016-08-10 国家电网公司 一种膨胀螺栓及其扩孔工具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683741A (en) * 1970-04-06 1972-08-15 George H Pete Mine roof expansion shell assembly
US4132080A (en) * 1977-11-07 1979-01-02 Stratabolt Corporation Resin anchored rock or mine roof bolt anchor mechanism

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US529742A (en) * 1894-11-27 Nut-lock
US1033447A (en) * 1912-02-08 1912-07-23 Herbert W Mower Expansion-bolt.
US1420532A (en) * 1920-11-09 1922-06-20 John F Pennewell Pipe grip
US1960405A (en) * 1932-05-20 1934-05-29 Amor George William Connection or coupling for tubular bodies
US2028328A (en) * 1933-08-18 1936-01-21 Bassick Co Expansion insert or caster socket for tubular legs or the like
US2207009A (en) * 1937-07-03 1940-07-09 Hubbard & Co Fastening or anchoring means for insulator supporting pins
US2241343A (en) * 1940-04-04 1941-05-06 Fleaca John Expansion shell for machine bolts
CA515957A (en) * 1955-08-23 B. Dempsey Joseph Mine roof bolt
GB754482A (en) * 1953-04-28 1956-08-08 Anciens Ets Lissments Goldenbe Improvements in and relating to bolt and like anchoring devices
US2774273A (en) * 1953-09-30 1956-12-18 Henry N Olson Anchor bolt having wedge shaped expander member secured thereto

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US529742A (en) * 1894-11-27 Nut-lock
CA515957A (en) * 1955-08-23 B. Dempsey Joseph Mine roof bolt
US1033447A (en) * 1912-02-08 1912-07-23 Herbert W Mower Expansion-bolt.
US1420532A (en) * 1920-11-09 1922-06-20 John F Pennewell Pipe grip
US1960405A (en) * 1932-05-20 1934-05-29 Amor George William Connection or coupling for tubular bodies
US2028328A (en) * 1933-08-18 1936-01-21 Bassick Co Expansion insert or caster socket for tubular legs or the like
US2207009A (en) * 1937-07-03 1940-07-09 Hubbard & Co Fastening or anchoring means for insulator supporting pins
US2241343A (en) * 1940-04-04 1941-05-06 Fleaca John Expansion shell for machine bolts
GB754482A (en) * 1953-04-28 1956-08-08 Anciens Ets Lissments Goldenbe Improvements in and relating to bolt and like anchoring devices
US2774273A (en) * 1953-09-30 1956-12-18 Henry N Olson Anchor bolt having wedge shaped expander member secured thereto

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840610A (zh) * 2016-05-11 2016-08-10 国家电网公司 一种膨胀螺栓及其扩孔工具
CN105840610B (zh) * 2016-05-11 2017-11-07 国家电网公司 一种膨胀螺栓及其扩孔工具

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BE566098A (US07122603-20061017-C00045.png)
NL226416A (US07122603-20061017-C00045.png)
NL102769C (US07122603-20061017-C00045.png)
LU36003A1 (US07122603-20061017-C00045.png)
DE1107170B (de) 1961-05-25

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