USRE34969E - Masonry screw anchor - Google Patents

Masonry screw anchor Download PDF

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Publication number
USRE34969E
USRE34969E US08/113,555 US11355593A USRE34969E US RE34969 E USRE34969 E US RE34969E US 11355593 A US11355593 A US 11355593A US RE34969 E USRE34969 E US RE34969E
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US
United States
Prior art keywords
diameter
threads
shank portion
smaller
constant
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.)
Expired - Lifetime
Application number
US08/113,555
Inventor
Tony L. Dixon
David E. Starke
Frank Piacenti
Robert W. Brown, Jr.
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Newfrey LLC
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Newfrey LLC
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Publication date
Application filed by Newfrey LLC filed Critical Newfrey LLC
Priority to US08/113,555 priority Critical patent/USRE34969E/en
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Publication of USRE34969E publication Critical patent/USRE34969E/en
Assigned to EMHART LLC reassignment EMHART LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: EMHART INC.
Assigned to NEWFREY LLC reassignment NEWFREY LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: EMHART LLC
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • 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
    • F16B13/02—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft
    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
    • 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
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws

Definitions

  • the present invention relates generally to an anchor device which is designed to be secured within a bore formed in a masonry structure.
  • a state of the art anchor device is disclosed in U.S. Pat. No. 4,657,460. That anchor is formed with a sharp helical thread which has a tapering crest diameter which decreases from the trailing extremity of the shank to the entering extremity. Notches formed on the crests of the helical thread provide a means for allowing the helical thread to become firmly embedded in the side walls of the bore hole. A series of helical protrusions are spaced along the shank which provide a means of guiding the screw.
  • Another object of this invention is to provide a screw which has high torsional resistance to minimize breakage that can occur during installation.
  • FIG. 1 is a side elevational view of an anchor device made in accordance with the teachings of the present invention embedded in a masonry like structure;
  • FIG. 2 is an enlarged partial elevation view of a portion of the anchor device shown in FIG. 1.
  • the masonry screw (10) as illustrated in FIG. 1 is shown with a large head section (12) with appropriate rotation inducing surfaces (14) and an elongated shank (16) with a substantially pointed entering extremity (18).
  • a first set of constant diameter D1, somewhat flat crested helical threads (19) are formed along the constant diameter D2 length L1 of the shank providing a first set of helical protrusions.
  • a second set of constant diameter D3 sharp crested helical threads (20) having a larger diameter than the crest diameter D1 of the first set of threads 19 is formed on the upper length L2 of the shank which has a uniform diameter D2 which is greater than the diameter D2 of the lower shank portion.
  • a set of helical protrusions (22) Spaced between the adjacent protrusions of the first set of threads 19 is a set of helical protrusions (22).
  • the threads (19) and the helical protrusions (22) will have approximately the same pitch and the crest diameter D1, D2 of the thread (19) will be greater than the radial dimension of the helical protrusion (22).
  • a set of helical protrusions (23) which will have the same pitch as the second set of threads and will have a diameter D6 slightly smaller than the crest diameter D3 of the second set of threads.
  • the crest diameter of the screw anchor is tapered or stepped 30 as indicated in FIG. 2 to merge the smaller diameter shank portion D2 with the larger diameter portion D4 and the ratio of large crest diameter D3 to large helical protrusions diameter D6 is the same as the ratio of small crest diameter D1 to small helical protrusions diameter D5.
  • the masonry like structure (28) is provided with a bore (30) through the use of a conventional masonry drilling device.
  • the fixture to be attached (32) may be positioned on the support structure and provided with an aperture (33) during the drilling operation.
  • the anchor device (10) is inserted in the bore (30) utilizing fastener drilling apparatus.
  • the relatively flat crests of the lead thread (19) form threads into the concrete and are embedded into the side walls of the bore.
  • the included angle of the threads (19) and (20) are approximately 30 degrees to facilitate the embedment.
  • the radial protrusions (22), (23) which are of a smaller diameter than the bore aid in centering and guiding the device into the bore without adding additional torsional stress during initial installation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

A masonry screw anchor having two different constant diameter shank portions connected via a taper. Each portion has a set of constant diameter threads and intermediate smaller diameter protrusions with the threads and protrusions on the larger diameter shank portion being larger in diameter than the diameter of the threads and protrusions on the smaller diameter portion.

Description

The present invention relates generally to an anchor device which is designed to be secured within a bore formed in a masonry structure.
A state of the art anchor device is disclosed in U.S. Pat. No. 4,657,460. That anchor is formed with a sharp helical thread which has a tapering crest diameter which decreases from the trailing extremity of the shank to the entering extremity. Notches formed on the crests of the helical thread provide a means for allowing the helical thread to become firmly embedded in the side walls of the bore hole. A series of helical protrusions are spaced along the shank which provide a means of guiding the screw.
One of the problems with this type anchor design is that the tapered thread acts like a wedge. The deeper it is driven the higher the drive torque to install and this can lead to premature breakage of the screw during installation.
Another negative of this design, which is formed by roll forming dies, is that since the threads are tapered special roll forming dies must be used.
It is accordingly an object of the present invention to provide an effective masonry screw which can be manufactured using commercially available roll form dies to form the threads. This will allow for more control of tolerances pertaining to thread diameter and would also contribute to longer die life.
It is the object of the present invention to provide a masonry anchor which will require a low driving torque but will still provide good resistance to pullout and shear.
Another object of this invention is to provide a screw which has high torsional resistance to minimize breakage that can occur during installation.
Other objects and advantages of the present invention will become apparent from the following portion of the specification and drawings which indicate in accordance with the mandate of the patent which statutes a presently preferred embodiment incorporating the principles of the invention.
REFERRING TO THE DRAWINGS
FIG. 1 is a side elevational view of an anchor device made in accordance with the teachings of the present invention embedded in a masonry like structure; and
FIG. 2 is an enlarged partial elevation view of a portion of the anchor device shown in FIG. 1.
The masonry screw (10) as illustrated in FIG. 1 is shown with a large head section (12) with appropriate rotation inducing surfaces (14) and an elongated shank (16) with a substantially pointed entering extremity (18). A first set of constant diameter D1, somewhat flat crested helical threads (19) are formed along the constant diameter D2 length L1 of the shank providing a first set of helical protrusions. A second set of constant diameter D3 sharp crested helical threads (20) having a larger diameter than the crest diameter D1 of the first set of threads 19 is formed on the upper length L2 of the shank which has a uniform diameter D2 which is greater than the diameter D2 of the lower shank portion. Spaced between the adjacent protrusions of the first set of threads 19 is a set of helical protrusions (22). The threads (19) and the helical protrusions (22) will have approximately the same pitch and the crest diameter D1, D2 of the thread (19) will be greater than the radial dimension of the helical protrusion (22). Similarly spaced between the adjacent protrusions of the second set of threads 20 is a set of helical protrusions (23) which will have the same pitch as the second set of threads and will have a diameter D6 slightly smaller than the crest diameter D3 of the second set of threads.
The crest diameter of the screw anchor is tapered or stepped 30 as indicated in FIG. 2 to merge the smaller diameter shank portion D2 with the larger diameter portion D4 and the ratio of large crest diameter D3 to large helical protrusions diameter D6 is the same as the ratio of small crest diameter D1 to small helical protrusions diameter D5.
The masonry like structure (28) is provided with a bore (30) through the use of a conventional masonry drilling device. One of the advantages of the present invention is that the fixture to be attached (32) may be positioned on the support structure and provided with an aperture (33) during the drilling operation. When the fixture and structure has been prepared the anchor device (10) is inserted in the bore (30) utilizing fastener drilling apparatus.
As the anchor device (10) is rotated and axially inserted into the bore, the relatively flat crests of the lead thread (19) form threads into the concrete and are embedded into the side walls of the bore. As the device is driven deeper the upper threaded portion (20) having the sharp crested larger diameter threads further engages the threads in the concrete formed by the lower threads (19). The included angle of the threads (19) and (20) are approximately 30 degrees to facilitate the embedment. The radial protrusions (22), (23) which are of a smaller diameter than the bore aid in centering and guiding the device into the bore without adding additional torsional stress during initial installation.

Claims (5)

We claim:
1. A masonry screw anchor comprising
an elongated shank portion including a smaller constant diameter portion having a pointed end and an adjacent larger diameter portion joined therewith via a tapered portion
a first set of constant diameter threads on said smaller diameter shank portion,
a first set of constant diameter helical protrusions, having a diameter smaller than the diameter of said first set of threads, on said smaller diameter shank portion between said threads,
a second set of constant diameter threads on said larger diameter shank portion, said second set of threads having a larger diameter than the diameter of said first set of threads, and
a second set of constant diameter helical protrusions, having a diameter smaller than the diameter of said second set of threads, on said larger diameter shank portion between said second threads.
2. A masonry screw anchor according to claim 1, wherein the ratio of thread diameter to protrusion diameter for the large shank portion is equal to the same ratio for the smaller shank portion. .Iadd.
3. A masonry screw anchor comprising:
an elongated shank portion including a smaller constant diameter portion having a pointed end and an adjacent larger diameter portion joined therewith via a tapered portion,
a first set of constant diameter threads on said smaller diameter shank portion,
a first set of constant diameter helical protrusions, having a diameter smaller than the diameter of said first set of threads, on said smaller diameter shank portion between said threads, and
a second set of constant diameter threads on said larger diameter shank portion, said second set of threads having a larger diameter than the diameter of said first set of threads. .Iaddend. .Iadd.
4. A masonry screw anchor according to claim 3 further comprising a second set of constant diameter helical protrusions positioned on said larger diameter shank portion between said second set of constant diameter threads. .Iaddend. .Iadd.5. A masonry screw anchor comprising:
an elongated shank portion including a lower portion having a pointed end and an adjacent upper portion joined therewith,
a first set of constant diameter threads on said lower shank portion,
a first set of constant diameter helical protrusions, having a diameter smaller than the diameter of said first set of threads, on said lower shank portion between said threads, and
a second set of constant diameter threads on said upper shank portion, said second set of threads having a larger diameter than the diameter of said first set of threads. .Iaddend. .Iadd.6. A masonry screw anchor according to claim 5 further comprising a second set of constant diameter helical protrusions positioned on said upper shank portion between said second set
of constant diameter threads. .Iaddend. .Iadd.7. A masonry screw anchor according to claim 5 or 6 wherein said upper portion of the shank has a larger diameter than the lower portion. .Iaddend. .Iadd.8. A masonry screw anchor according to claim 7 wherein said upper portion of the shank is joined with said lower portion via a tapered portion. .Iaddend.
US08/113,555 1990-10-03 1993-08-27 Masonry screw anchor Expired - Lifetime USRE34969E (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/113,555 USRE34969E (en) 1990-10-03 1993-08-27 Masonry screw anchor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/592,138 US5061136A (en) 1990-10-03 1990-10-03 Masonry screw anchor
US08/113,555 USRE34969E (en) 1990-10-03 1993-08-27 Masonry screw anchor

Related Parent Applications (1)

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US07/592,138 Reissue US5061136A (en) 1990-10-03 1990-10-03 Masonry screw anchor

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USRE34969E true USRE34969E (en) 1995-06-13

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US07/592,138 Ceased US5061136A (en) 1990-10-03 1990-10-03 Masonry screw anchor
US08/113,555 Expired - Lifetime USRE34969E (en) 1990-10-03 1993-08-27 Masonry screw anchor

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US07/592,138 Ceased US5061136A (en) 1990-10-03 1990-10-03 Masonry screw anchor

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EP (1) EP0479586B1 (en)
AU (1) AU648225B2 (en)
CA (1) CA2052667C (en)
DE (1) DE69105444T2 (en)

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US5779417A (en) * 1997-05-12 1998-07-14 Illinois Tool Works Inc. Fastener having primary and secondary threads
US6322307B1 (en) * 1997-07-26 2001-11-27 Unifix Limited Fixing anchor
US6419435B1 (en) 2000-07-11 2002-07-16 Paul Gaudron Wedging masonry anchor bolt and sleeve anchor for masonry bolt used in cinder blocks
US6743233B1 (en) 2000-08-02 2004-06-01 Orthopaedic Biosystems, Ltd., Inc. Medical screw and method of installation
US20040120791A1 (en) * 2002-12-18 2004-06-24 Panasik Cheryl L. Threaded fastener with dual reinforcing leads and improved substrate entry or lead end portion
US6899500B2 (en) 2001-06-19 2005-05-31 Illinois Tool Works Inc. Fastner having multiple-bossed lead
US20050129484A1 (en) * 2002-05-01 2005-06-16 Joker Industrial Co., Ltd. Anchoring screw with double heads and triple threads of different depths of thread
US20050135900A1 (en) * 2002-12-18 2005-06-23 Illinois Tool Works Inc. Threaded fastener with dual reinforcing leads for facilitating manufacture of the fastener, thread rolling die for forming the threaded fastener, and method of manufacturing the threaded fastener
US20050191150A1 (en) * 2002-03-15 2005-09-01 Charles Bickford Fixing device and method for fixing to a substrate
US20060140738A1 (en) * 2004-12-27 2006-06-29 Teng-Hung Lin Screw
US7070376B1 (en) * 1999-12-14 2006-07-04 Simpson Strong-Tie Company, Inc. Self-drilling, self-anchoring fastener for concrete
US7101134B2 (en) 2001-06-19 2006-09-05 Illinois Tool Works Inc. Fastener having multiple lobed thread
US20060217727A1 (en) * 2002-06-21 2006-09-28 Chad Munro Bone screw
US20060285940A1 (en) * 2005-06-16 2006-12-21 Mirco Walther Screw For Use In Concrete
US7156600B2 (en) 2001-06-19 2007-01-02 Illinois Tool Works Inc. Die for, method of making, and fastener with lobed primary thread lead and interposed dual auxiliary thread lead with improved substrate entry end portion
US20070172333A1 (en) * 2006-01-09 2007-07-26 Tian-Fu Tsau Screw member having two different thread angles formed on a sharp-edged thread
US20080050198A1 (en) * 2006-08-23 2008-02-28 Thoms Ayrle Fastening element for hard constructional component
US20080118332A1 (en) * 2006-11-16 2008-05-22 David Lamb Drywall screw
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Cited By (35)

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Publication number Priority date Publication date Assignee Title
WO1997046167A1 (en) * 1996-06-06 1997-12-11 Orthopaedic Biosystems Ltd., Inc. Bone screw
US5743914A (en) * 1996-06-06 1998-04-28 Skiba; Jeffry B. Bone screw
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DE69105444T2 (en) 1995-04-27
EP0479586A1 (en) 1992-04-08
US5061136A (en) 1991-10-29
CA2052667A1 (en) 1992-04-04
EP0479586B1 (en) 1994-11-30
AU648225B2 (en) 1994-04-14
CA2052667C (en) 1995-01-17
DE69105444D1 (en) 1995-01-12
AU8556891A (en) 1992-04-09

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