US3765296A - Expansion anchor for use in support structures of relatively soft material - Google Patents

Expansion anchor for use in support structures of relatively soft material Download PDF

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Publication number
US3765296A
US3765296A US00176121A US3765296DA US3765296A US 3765296 A US3765296 A US 3765296A US 00176121 A US00176121 A US 00176121A US 3765296D A US3765296D A US 3765296DA US 3765296 A US3765296 A US 3765296A
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United States
Prior art keywords
expansion anchor
sleeve
front portion
shell
sections
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Expired - Lifetime
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US00176121A
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English (en)
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A Fischer
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Individual
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    • 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
    • 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
    • F16B13/0808—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 by a toggle-mechanism

Definitions

  • ABSTRACT An expansion anchor sleeve is composed of two elongated shell sections of U-shaped cross-section whose open sides face one another and'are bounded by juxtaposed edge faces.
  • a transverse recess is provided-in the front portion of the sleeve tapering towards the rear portion and bounded by sections of the aforementioned edge faces on which an expander member, located in the recess, rides when it is drawn rearwardly by a threaded actuating member.
  • the present invention relates generally to anexpansion anchor, and more particularly to an expansion anchor which is especially intended for use in support structures of relatively soft material, such as porous matter including porous concrete.
  • Expansion anchors are already well known in a substantial variety of different types. Many of these operate by drawing a usually conical expander member into a slotted expansion anchor sleeve from the leading end towards the trailing end of the same, thereby radially spreading the sleeve into frictional engagement with the wall surrounding a bore in the support structure in which the expansion anchor is to be retained.
  • This type of expansion anchor is entirely sufficient for affording the necessary frictional retention of the expansion anchor against withdrawing forces from the expansion anchor hole, provided that the expansion anchor is used in a support structure-such as masonrywhich is composed of rather hard material. It is possible with this type of expansion anchor to expand the sections into which the expansion anchor sleeve is subdivided by longitudinally slotting it, to an extent which is greater than the outer diameter of the expander member by twice the wall thickness of the sleeve. The situation is different, however, if the material of the support structure in which the expansion anchor is to be retained is relatively soft -for instance porousand will tend to crumble or collapse when the sleeve is expanded and attempts to contact it under pressure.
  • An additional object of the invention is to provide such an expansion anchor which is simple and relatively inexpensive to construct.
  • an expansion anchor for use in support structures of relatively soft material
  • which anchor comprises, briefly stated, an expansion anchor sleeve having a front portion and a rear portion and including a pair of elongated shell sections of substantially U- shaped cross-section having facing open sides bounded by juxtaposed edge faces.
  • a transverse recess is provided in the front portion of the sleeve, being bounded by sections of the edge faces which converge in direction from a leading end 'of the front portion towards the rear portion of the sleeve.
  • An expander member is located in this recess extending transverse of the elongation of the sleeve, and threaded means extends from the region of the rear portion towards the leading end and is fast with the expander member.
  • the dimension of the expander member in direction transverse to the longitudinal axis of the expansion anchor sleeve must correspond at least to the outer diameter of the sleeve in the region of the plane of separation of the twosh'ell sections. This is necessary to assure that the expander member will slide on the juxtaposed edge faces of the shell sections when it is withdrawn in a sense tending to expand the sleeve. It has been found particularly advantageous to construct the expander member in cylindrical or substantially cylindrical configuration, in order to thereby reduce the friction between the expan der member and the edge faces on which it slides during expansion, whereby the force required for effecting such expansion is held to a minimum.
  • the longitudinal axis of the cylindrically configurated expander member of course extends transversely to the longitudinal axis of the sleeve and the expander member may be of one piece with a threaded actuating screw or bolt by means of which it is drawn towards the rear end of the sleeve or it may be connected with this screw or bolt in suitable manner, for instance via a screw connection.
  • the expansion obtained is significantly greater because the U-shaped cross-sectional configuration of the shell sections makes the latter so rigid that their bending or deflection inwardly towards one another at opposite sides of the expander member (as seen with respect to the longitudinal axis of the sleeve) is practically impossible.
  • the expanding shell sections tend to force the soft and- /or porous material of the support structure which surrounds the expansion anchor hole ahead of themselves and to compact it. It will be appreciated that the greater the angle of expansion of the shell sections is, the greater will be the amount of support structure material which is engaged and compacted.
  • the amount of such material is determinative of the resistance which the expansion anchor sleeve can oppose to a force tending to withdraw it from the expansion anchor hole, so that the present expansion anchor is particularly advantageous and highly effective for use in support structures of porous and/or soft material.
  • FIG. 1 is a perspective view illustrating one embodiment of the novel expansion anchor
  • FIG. 2 is a view similar to FIG. 1 but illustrating another embodiment of the expansion anchor
  • FIG. 3 is an axial section showing the expansion anchor of FIG. 1 anchored in a support structure
  • FIG. 4 is a fragmentary somewhat diagrammatic detail view of the front end portion of an anchor similar to FIG. 1 but illustrating an additional embodiment.
  • the novel expansion anchor has an expansion anchor sleeve 1 which is composed of two elongated shell sections 4a and 4b which are of substantially U-shaped cross-section with their open sides facing one another.
  • the open sides of each shell section are bounded by longitudinally extending edge faces each of which has a section 11 inclined with respect to the longitudinal axis of the sleeve 1, and a section 12 which extends in substantial parallelism with this longitudinal axis.
  • connection can be effected in various ways, for instance by spot welding, by tongue-and-groove connections, or in other ways, so that the sleeve 1 can be assembled from two identical shell sections which are connected with one another.
  • the connection is illustrated at 3 and is here in form of interlocking or interengaging notches and projections on the respective shell sections 4a and 4b, this being a particularly advantageous way of connecting the shell sections with one another.
  • These notches and projections can also be so constructed that they serve as a guide for the threaded means, here illustrated as a screw or bolt 5 which cooperates with a nut 6. Guidance so provided prevents lateral yielding of the screw or bolt 5 during use of the expansion anchor.
  • the sections 11 of the edge faces define with one another a recess 9 which converges or tapers in direction towards the trailing end portion or rear end portion 2 of the sleeve, and located in this recess 9 is an expander member 7 which is here of cylindrical configuration and may either be of one piece with the bolt 5 or, as in this embodiment (see FIG. 3), may be made fast therewith by being provided with a threaded bore through which the bolt 5 is passed.
  • the recess 9 extends to the area where the edge face sections 12 extend in parallelism with the longitudinal axis of the sleeve 11 and its configuration not only serves to effect expansion of the shell sections 4a and 4b in cooperation with the expander member 7, but also to reduce friction during such expansion.
  • transverse slots 13 which extend inwardly from the sections 12 in the two shank wall portions of the respective shell sections and terminate at or at least in the proximity of the bight wall portion associated with the respective shank wall portions.
  • These slots are located just forwardly of the location 3 where the shell sections 4a and 4b are connected with one another and their provision forms the sleeve 1 with two strip-shaped wall portions 14a and 14b which are offset with respect to the plane of separation of the shell sections 4a and 4b through in each case, and which in effect as pivots about which the shell sections 4a and 4b can be radially outwardly deflected as shown in FIG.
  • FIG. 2 illustrates a further embodiment of the invention according to which the shell sections 4a and 4b of the sleeves 1' overlap one another or are partly encapsulated one within the other.
  • the expander member 7 slides on the sections 11 which overlap one another as shown in FIG. 2, so that the expander member can expand the shell sections 4a and 4b even further than in the embodiment of FIGS. 1 and 3.
  • the crosssectional configuration of the shell sections 411' and 4b is again substantially U-shaped, but of angular rather than rounded configuration to make possible a maximum overlapping of the shell sections without any significant reduction of the cross-section of the inner passage defined between them.
  • the sleeve l' is of course in this case of quadratic or rectangular cross-section, a configuration which affords an additional advantage in that it inherently precludes undesired turning of the sleeve in the expansion anchor hole when the bolt 5 is turned in a sense drawing the expander member 7 deeper into the sleeve.
  • the shell sections 4a and 4b in this embodiment are connected with one another by several-here four-depressions or kerfs in the overlapping shank walls of the respective shell sections, and the projections resulting at the interior of the respective shell sections from the provision of the depression 15 have a cross-section across the central passage of the sleeve 1 which corresponds to the outer diameter of the bolt 5 to serve as a guide therefor.
  • the bight walls of the respective shell sections 4a and 4b extend beyond the shank walls and forwardly of the leading end of the sleeve 1, being bent towards one another transversely of the longitudinal axis of the sleeve and across the recess 9 to form a cap 16 which is of one piece with the sleeve.
  • the fragmentarily illustrated sleeve 1 is similar to the sleeve of FIGS. 1 and 3. It is, however, provided with a separate cap l8-by contrast to the integral cap in FIG. 2-- which is placed onfor instance pushed on and for instance frictionally retained onthe leading end of the sleeve 1 and which serves to prevent the expander member 7 from being driven inwardly into the sleeve when the expansion anchor is forcibly inserted into an expansion anchor hole; this precludes premature expansion of the shell sections 4a and 4b. It is particularly advantageous, and frequently even necessary, when the expansion anchor hole which is separately formed and accommodates the anchor, has dimensions which are smaller than the outer dimensions of the sleeve.
  • the cap 18 must of course engage and be supported by the sleeve, and not by the expander member 7 and must be so configurated that it does not interfere with the subsequent radial expansion of the sleeve, for which purpose the portions of the cap are advantageously made so thin that they will break off or at least yield in outward direction in response to even a slight force tending to expand the shell sections 4a and 4b. It is also advantageous to make the cap 18 pointed in forward direction to facilitate its insertiontogether with the remainder of the expansion anchor-into an expansion anchor hole, particularly a tight one.
  • the cap 18, as well as the integral cap 16 of FIG. 2, also serves to prevent the expander member 7 from falling out of the recess 9 if for any reason the expander member is not connected with the bolt 5 or if for instance the bolt 5 is not connected with the nut 6 in which case the expander member and the bolt could slide out the leading end of the sleeve together.
  • An expansion anchor for use in support structures of relatively soft material, comprising an expansion anchor sleeve having a front portion and a rear portion and comprising a pair of elongated shell sections of substantially U-shaped cross-section, each having a pair of substantially parallel side walls bounded at one side by edge faces and integrally joined at the other side by a bight wall angularly related to said side walls, the side walls of one of said shell sections overlapping the side walls of the other shell section and the bight walls of said shell sections facing each other to define with said side walls a space of substantially rectangular configuration; a transverse recess in said front portion and bounded by sections of said edge faces which converge from said front portion towards said rear portion, each edge face section extending from the bight wall of one shell section towards the bight wall of the other shell section and having on the overlapping portion of the respective side wall an upper end adjacent said bight wall of the other shell section; an expander member located in said recess and extending transversely to the elongation
  • An expansion anchor for use in support structures of relatively soft material, comprising an expansion anchor sleeve having a front portion and a rear portion and comprising a pair of elongated shell sections of substantially U-shaped cross-section, each having a pair of substantially parallel side walls bounded at one side by edge faces and integrally joined at the other side by a bight wall, the side walls of one of said shell sections overlapping the side walls of the outer shell section and the bight walls of said shell sections facing each other; a transverse recess in said front portion and bounded by sections of said edge faces which converge from said front portion towards said rear portion, each edge face section extending from the bight wall of one shell section towards the bight wall of the other shell section and having an upper end located on the portion of the respective side wall which substantially overlaps the other side wall; an expansion member located in said recess and extending transversely to the elongation of said sleeve; and threaded means extending from the region of said rear portion towards said front portion and
  • said connecting means comprising interengaging notches and projections provided on the respective shell sections in the region of said rear portion.
  • each of said bight walls comprises a wall portion extending forwardly of said side walls and of the leading end of said front portion, said wall portions extending towards one another transversely of a longitudinal axis of said sleeve and across said recess and together constituting said cap.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Reinforcement Elements For Buildings (AREA)
US00176121A 1970-09-03 1971-08-30 Expansion anchor for use in support structures of relatively soft material Expired - Lifetime US3765296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702043621 DE2043621A1 (de) 1970-09-03 1970-09-03 Dübel für eine Wand aus porösem Material wie z.B. Gasbeton

Publications (1)

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US3765296A true US3765296A (en) 1973-10-16

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US00176121A Expired - Lifetime US3765296A (en) 1970-09-03 1971-08-30 Expansion anchor for use in support structures of relatively soft material

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US (1) US3765296A (enExample)
BR (1) BR7105734D0 (enExample)
CH (1) CH541732A (enExample)
CS (1) CS165360B2 (enExample)
DE (1) DE2043621A1 (enExample)
ES (1) ES196795Y (enExample)
FR (1) FR2107152A5 (enExample)
GB (1) GB1353972A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5554191A (en) * 1994-01-26 1996-09-10 Biomat Intersomatic vertebral cage
US20040127994A1 (en) * 2002-10-16 2004-07-01 Erich Kast Implant for placement between vertebrae
US20050125004A1 (en) * 1998-04-23 2005-06-09 Scimed Life Systems, Inc. Atraumatic medical retrieval device
US6969220B2 (en) * 2003-04-24 2005-11-29 Black & Decker Inc. Wall anchor for a screw, and assembly constituted by such a wall anchor and a screw
US7803190B2 (en) * 2002-10-29 2010-09-28 Kyphon SÀRL Interspinous process apparatus and method with a selectably expandable spacer
US8337531B2 (en) 2001-03-08 2012-12-25 Spine Wave, Inc. Method of supporting and distracting opposing vertebral bodies of a spine
US20220062007A1 (en) * 2010-05-17 2022-03-03 Globus Medical, Inc. Soft tissue repair system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3335628A1 (de) * 1983-09-30 1985-04-04 Hilti Ag, Schaan Spreizduebel mit einziehbarem spreizkoerper
DE19536729C2 (de) * 1995-10-02 2002-03-21 Rw Ruedel Werner Werkzeug & Ma Keil zur Sicherung von Bauteilen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US13177A (en) * 1855-07-03 John loudon and otto ahlstkom
FR430603A (fr) * 1911-06-03 1911-10-20 Louis Boudreaux Perfectionnements aux dispositifs intermédiaires de fixation et d'ancrage de boulons, vis ou autres organes analogues
US1019723A (en) * 1910-10-04 1912-03-05 Diamond Expansion Bolt Co Expansion-bolt.
US1109955A (en) * 1914-03-06 1914-09-08 Arthur C Barrett Expansion-bolt.
US1471911A (en) * 1921-07-22 1923-10-23 Edward Ogden J Bolt anchor
FR767444A (fr) * 1934-01-18 1934-07-17 Piton-cheville
US3366000A (en) * 1965-05-11 1968-01-30 Tinnerman Products Inc Fastening device
US3623396A (en) * 1967-04-05 1971-11-30 Aackersberg Mortensen Expansion plug

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US13177A (en) * 1855-07-03 John loudon and otto ahlstkom
US1019723A (en) * 1910-10-04 1912-03-05 Diamond Expansion Bolt Co Expansion-bolt.
FR430603A (fr) * 1911-06-03 1911-10-20 Louis Boudreaux Perfectionnements aux dispositifs intermédiaires de fixation et d'ancrage de boulons, vis ou autres organes analogues
US1109955A (en) * 1914-03-06 1914-09-08 Arthur C Barrett Expansion-bolt.
US1471911A (en) * 1921-07-22 1923-10-23 Edward Ogden J Bolt anchor
FR767444A (fr) * 1934-01-18 1934-07-17 Piton-cheville
US3366000A (en) * 1965-05-11 1968-01-30 Tinnerman Products Inc Fastening device
US3623396A (en) * 1967-04-05 1971-11-30 Aackersberg Mortensen Expansion plug

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5554191A (en) * 1994-01-26 1996-09-10 Biomat Intersomatic vertebral cage
US20050125004A1 (en) * 1998-04-23 2005-06-09 Scimed Life Systems, Inc. Atraumatic medical retrieval device
US7691111B2 (en) * 1998-04-23 2010-04-06 Boston Scientiffic Scimed, Inc. Atraumatic medical retrieval device
US20100268246A1 (en) * 1998-04-23 2010-10-21 Boston Scientific Scimed, Inc. Atraumatic medical retrieval device
US8105336B2 (en) 1998-04-23 2012-01-31 Boston Scientific Scimed, Inc. Atraumatic medical retrieval device
US8337531B2 (en) 2001-03-08 2012-12-25 Spine Wave, Inc. Method of supporting and distracting opposing vertebral bodies of a spine
US8343193B2 (en) 2001-03-08 2013-01-01 Spine Wave, Inc. Method of supporting and distracting opposing vertebral bodies
US20040127994A1 (en) * 2002-10-16 2004-07-01 Erich Kast Implant for placement between vertebrae
US7220280B2 (en) * 2002-10-16 2007-05-22 Advanced Medical Technologies Ag Spreader implant for placement between vertebrae
US7803190B2 (en) * 2002-10-29 2010-09-28 Kyphon SÀRL Interspinous process apparatus and method with a selectably expandable spacer
US6969220B2 (en) * 2003-04-24 2005-11-29 Black & Decker Inc. Wall anchor for a screw, and assembly constituted by such a wall anchor and a screw
US20220062007A1 (en) * 2010-05-17 2022-03-03 Globus Medical, Inc. Soft tissue repair system
US12257162B2 (en) * 2010-05-17 2025-03-25 Globus Medical, Inc. Soft tissue repair system

Also Published As

Publication number Publication date
FR2107152A5 (enExample) 1972-05-05
ES196795U (es) 1975-03-16
CS165360B2 (enExample) 1975-12-22
GB1353972A (en) 1974-05-22
ES196795Y (es) 1975-08-16
DE2043621A1 (de) 1972-03-09
CH541732A (de) 1973-09-15
BR7105734D0 (pt) 1973-04-26

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