US20040261355A1 - Shaped anchor - Google Patents
Shaped anchor Download PDFInfo
- Publication number
- US20040261355A1 US20040261355A1 US10/893,329 US89332904A US2004261355A1 US 20040261355 A1 US20040261355 A1 US 20040261355A1 US 89332904 A US89332904 A US 89332904A US 2004261355 A1 US2004261355 A1 US 2004261355A1
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- United States
- Prior art keywords
- shank
- hole
- anchor
- walls
- masonry
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 abstract description 12
- 230000005489 elastic deformation Effects 0.000 abstract description 7
- 239000002184 metal Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
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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
- F16B15/00—Nails; Staples
- F16B15/06—Nails; Staples with barbs, e.g. for metal parts; Drive 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/002—Resiliently deformable pins
- F16B19/004—Resiliently deformable pins made in one piece
Definitions
- the invention relates broadly to an anchor for securing fixtures to masonry or other material, and more particularly, the invention relates to a shaped anchor having a multi-planar bend adapted for engaging a hole wall over an extended surface area so as to provide an increased resistance to dislodgment when the anchor is loaded.
- Anchors for masonry or other structure are known, as in U.S. Pat. Nos. 4,963,062 and 4,828,445 to Giannuzzi.
- the undulations function as a means for providing a tight fit in the hole for purposes of securing the shank within the hole.
- the anchor's shank is forcibly driven into the hole. As the shank is forced into the hole, the shank undulation is elastically deformed as it comes into contact with the wall. A frictional fit of the shank in the hole results from the pressure forces exerted on the wall by the shank as it attempts to return to its original shape.
- an anchor for masonry is adapted for being driven into a hole formed in masonry, or another suitable material, in a direction approximately perpendicular to the masonry plane.
- the anchor includes a head, a shank extending from the head and having an end, the shank including an upper shank portion extending from the head, having a longitudinal axis and defining a nominal shank diameter, and a curved shank portion extending between the upper shank portion and the shank end, the curved shank portion being shaped so as to describe a bearing surface that is disposed at a greater distance from the longitudinal axis than the nominal shank diameter and extends through an angle of less than 360 degrees about the longitudinal axis.
- the shank allows for greater surface contact with the walls of a hole than previously attainable over the same length distance because unlike other known anchors, a frictional engagement may be attained circumferentially and continuously about the shank axis.
- the shank surface is preferably smooth over its length to minimize any chipping or gauging as the shank is forcibly inserted into the hole (e.g., by striking the head of the anchor with a hammer). There is little skill required to insert shank into the hole.
- the anchor of the invention has wide uses and does not require specialized tools or manpower.
- an anchor for masonry in another embodiment, includes a shank having a twisting portion disposed between an upper portion and terminal end.
- the shank has a longitudinal axis passing through the upper portion and terminal end, wherein when viewed in a first plane, the twisting portion describes one and only one first bend and when viewed in a second plane, perpendicular to the first plane, the twisting portion describes one and only one second and third bends.
- a bearing surface of the shank is provided which attains one of a 360 degree and greater than 360 degree friction-fit engagement between the hole wall and shank by elastic deformation of the shank as it is driven into the hole, the bearing surface comprising a curved surface formed by the first, second and third bends.
- the first bend may approximate a half sine wave and the second and third bends together approximate a full sine wave of a different peak-to-peak extent than the first bend.
- the shank of the anchor includes an upper end, a lower end, a longitudinal axis passing through the centroid of the cross-sections of the upper and lower ends and a nominal shank outer radius.
- a method of securing a masonry anchor in masonry by frictional engagement with the masonry includes the steps providing an anchor including a shank having a longitudinal axis and a first and second shank portion, the first shank portion having a generally circular cross-section when projected onto a plane that is perpendicular to the longitudinal axis and the second shank portion including a generally elliptical cross-section when projected onto the plane, providing a hole in the masonry, the hole having cross-sectional dimensions that are non-conforming to the second shank portion cross-section, forcibly driving the shank into the hole so as to cause the shank to undergo a substantially elastic deformation in the vicinity of the second shank portion, the deformation tending to align the first and second shank portions with the cross-section of the hole and the shank exerting elastic restoring forces on the walls of the hole in response to the elastic deformation, wherein when the first and second shank portions are disposed in the hole, the second shank portion describes an
- FIG. 1A is a perspective view of a first embodiment of an anchor made in accordance with the principles of the invention.
- FIG. 1B is a plan view of the anchor of FIG. 1A inserted into a hole of masonry.
- FIGS. 2A-2D are multiple plan views of the anchor of FIG. 1.
- the planar views are located according to an X-Y-Z Cartesian coordinate system with the Z-axis being parallel to and co-linear with the longitudinal axis of a shank of the anchor and the planar views lie in the Y-Z and X-Z planes, respectively.
- FIG. 3 is a view of the anchor of FIG. 1 taken along section III-III in FIG. 2A. A head of the anchor of FIG. 1 is not shown.
- FIG. 4 is a geometric illustration of the shank taken along section IV-IV in FIG. 2A used to illustrate a mathematical representation of the surface contours of the shank.
- FIGS. 5A-5B is a view of the anchor inserted into a hole, as viewed in the X-Z and X-Y planes, respectively, showing a bearing surface of the anchor.
- FIG. 6 is a view of the anchor of FIG. 1 embedded into a hole of masonry having a crack in the vicinity of the masonry hole.
- FIGS. 7A and 7B are planar views of a tooling for forming the shank.
- anchor 10 is shown in perspective view.
- anchor 10 is shown inserted into a pre-formed hole 19 of masonry 18 with anchor being used to attach a fixture 6 to masonry 18 .
- Anchor 10 may be used to attach fixture 6 to the surface of masonry in much the same manner as the anchor described in U.S. Pat. No. 4,963,062, herein incorporated by reference in its entirety.
- Anchor 10 is forcibly inserted into hole 19 and securely held therein by frictional forces that resist removal of anchor 10 from hole 19 .
- Anchor 10 includes a shank 14 preferably formed from a solid piece of carbon or stainless steel that is generally circular in cross section.
- Shank 14 may also be hollow and without an integral head 12 for purposes of e.g., providing a threading or other type of mount on the inner wall surface of the shank for securing a fastener and/or fastener mount to shank 14 .
- a shaped portion 30 is formed along shank 14 to facilitate a frictional hold of anchor 10 within hole 19 .
- a head 12 is integral with shank 14 at one end and a tapered end 28 is formed at the opposite end to assist with guiding anchor 10 into hole 19 .
- Shaped portion 30 is preferably disposed between an upper portion 22 and lower portion 24 of shank 14 , as indicated in FIG. 2B.
- shank 14 is rendered resilient by tempering the metal at an appropriate temperature to impart memory to the metal so that a subsequent deformation of shank 14 when inserted into an appropriately sized hole will occur substantially within the elastic range of the material.
- Anchor 10 may be axially driven into a pre-drilled hole of masonry or other material by applying an axial force F to head 12 , such as by striking head 12 with a hammer.
- Hole 19 which may be cylindrical, is sized to be slightly greater than the generally circular cross-section of shank 14 .
- shank axis 16 aligns with the longitudinal axis of hole 19 and is axially aligned with hole 19 when fully lodged in hole 19 .
- the bends formed on shank 14 abut walls 20 of hole 19 because surfaces within this region of shank 14 (i.e., shaped portion 30 ) extend beyond the dimensions of hole 19 as anchor 10 is being driven axially into hole 19 .
- the hole 19 whether it be formed in masonry or another suitable material, are preferably essentially non-compliant relative to the stiffness of shank 14 . Therefore, as shaped portion 30 encounters walls 20 , the bends of shaped portion 30 will be forced into near alignment with walls 20 by deformation of shank 14 .
- the degree of deviation about shank axis 16 in shaped portion 30 is suitably chosen to limit deformation to within the elastic range of the material so that shank 14 will exert a high magnitude opposing force on walls as it seeks to retain its original shape.
- This opposing force exerted upon walls 20 creates a frictional engagement between anchor 10 and hole 19 which is primarily responsible for providing a resistance to dislodgment of anchor from hole 19 when external forces are applied to anchor 10 .
- anchor 10 when using a material having a high Young's modulus (e.g., 1020 steel), anchor 10 is capable of sustaining loads of several thousands of pounds over a relatively short insertion depth without becoming dislodged from masonry 18 .
- shank 14 is generally smooth so as to minimize any gauging or chipping of walls 19 as anchor 10 is driven into hole 19 .
- chipping or gauging of holes 19 re-shapes hole 19 , which can limit the ability of hole 19 to deform shank 14 . If the amount of elastic deformation of shank 14 is reduced as a result of re-shaping of hole 19 , the corresponding magnitude of restoring force is reduced, which then reduces the amount of frictional holding force of anchor 10 within hole 19 .
- the magnitude of frictional force that will resist dislodgment of anchor 10 from hole 19 is proportional to the amount of surface contact achieved between shank 14 and walls 19 as anchor is driven into hole 19 .
- shank 14 deform in such a manner as to facilitate contact with holes 19 over a large surface area of shank 14 .
- Such a circumferential, or 360 degree (or greater) surface contact can provide an increased holding force over the same longitudinal extent of shank 14 and a more reliable frictional hold for anchor 10 in hole 19 in the event of a weakening of the masonry, such as by a crack formed in the vicinity of hole 19 .
- shaped portion 30 includes a three-dimensional bend which deviates from, and extends circumferentially about shank axis 16 .
- a X-Y-Z Cartesian coordinate system for anchor 10 is introduced with origin at the junction of lower portion 24 and shaped portion 30 , and the Z-axis parallel to and along shank axis 16 and extending from tapered end 28 towards head 12 of anchor 10 .
- FIGS. 2A-2D each of which show upper portion 22 , shaped portion 30 , and lower portion 24 , the Z coordinate axis extends approximately along the geometric center of upper and lower portions 22 , 24 , which are generally cylindrical in shape with the outer surfaces being located a distance of D/2 from the Z-axis, where D is the outer diameter of upper and lower portions 22 , 24 .
- FIGS. 2A-2D are successive 90 degree planar views of shank 14 . As illustrated, the three-dimensional, circumferentially extending bend of shaped portion 30 is such that a single bend 32 appears in the X-Z plane, FIGS. 2A and 2C, and bends 34 and 36 appear in the X-Z plane, FIGS. 2B and 2D.
- FIG. 3 shows a profile of shank 14 in the X-Y plane as taken at section III-III in FIG. 2A (head 12 not shown).
- bends 32 , 34 and 36 together form a bulge 31 which extends about the Z coordinate axis with the maximum extent of bulge 31 being located along the +X axis at a distance H from the outer radius of lower portion 24 .
- Bulge 31 is the projection in the X-Y plane of a continuous bend that circumferentially-extends about the Z-axis.
- the outer surface of bend 32 is located at a greater distance from the Z-axis than is bends 34 and 36 .
- This difference in magnitude between bends 32 and 34 , 36 in the X-Z and Y-X planes explains the shape of bulge 31 seen in FIG. 3, which is asymmetric about the X-axis but symmetric about the Y-axis.
- the portions of bulge 31 formed by bends 32 , 34 and 36 is shown in FIG. 3.
- the three dimensional nature of the bend can be visualized as follows: as one follows the outer surface projection of bulge 31 in FIG. 3 in a clockwise direction (i.e., view the portion of bulge in the ⁇ Y/ ⁇ X quadrant first, then ⁇ Y/+X quadrant, then +Y/+X quadrant, and then the +Y/ ⁇ X quadrant), the Z-axis coordinate of this outer surface increases.
- the nature of bends 32 , 34 and 36 may be thought of as sinusoidal such that bend 32 describes a half sinusoid and bends 34 and 36 together describe a full sinusoid.
- the outer surface of the three-dimensional bend of shaped section 30 may also be appreciated by a mathematical equation of a curve approximately tracing the path of the circumferentially extending bend of shaped section 30 .
- a polar equation is used with coordinate origin being coincident with the X-Y-Z coordinate system defined earlier.
- ⁇ radians
- D/2 is the nominal outer surface radial position for lower or upper portion
- 22 , 24 (D/2+H) is the maximum radial extent of bulge 31 , which corresponds to the peak of bend 32 in FIG.
- L is the length of shaped portion 30 , FIG. 2B, as measured along the Z-coordinate axis, and z is the z-coordinate.
- the coordinates r, ⁇ , z for a point along the bend may be approximated by:
- bulge 31 As shank 14 is inserted into a hole in masonry, or another suitably chosen material, bulge will deform in such a manner as to form a more circular-type bulge. In general, however, it is advantageous that the bulge be such that when deformed by the hole, will tend to conform to the cross-sectional dimensions of the hole as in, e.g., circular for a circular hole, as this can promote a maximum amount of surface contact with the wall surface and/or a circumferentially and continuously extending surface contact.
- a bearing surface 50 with walls 20 of hole 19 results from the elastic deformation of shank 14 .
- the nature of this surface contact may be understood by noting the approximate areas of surface contact 54 a , 54 b , 54 c and 54 d in FIG. 5B (Y-Z plane) and 52 a , 52 b , 52 c and 52 d in FIG. 5A (X-Z plane).
- bearing surface 50 extends continuously about shank 14 .
- the shape of shaped portion 30 facilitates the creation of this greater than 360 degree bearing surface 50 with walls 20 because the bends 32 , 34 , 36 , when encountering walls 19 as shank 14 advances into hole 19 , extend circumferentially and continuously about the Z-axis through an angle of nearly 360 degrees. As a result, surfaces disposed about the entire circumference of shank 14 in the vicinity of shaped section 30 will be forced into contact with walls 19 in reaction to wall forces applied to the bends 32 , 34 , 36 along the length of shaped portion 30 .
- This continuously extending, circumferential bearing surface 50 provides a increased surface contact between shank 14 and walls 20 , which increases the frictional forces between shank 14 and hole 19 over the same length of similar anchors, such as the anchor described in U.S. Pat.
- shank 14 tightest fit in accordance with the shape of shank 14 .
- the greater than 360 degree, continuous surface contact with walls 19 is a result of the three-dimensional, asymmetric aspects of shank 14 that allow shank 14 to be driven into hole 19 and deformed so as to engage walls 19 on all sides of shank 14 .
- Shank 14 may have a constant, nominal cross-section, as in anchor 10 , or shank 14 may have a tapered cross-section (which may require a corresponding tapered hole 19 ).
- Shank 14 may be hollow so as to serve as an anchor point for attaching secondary fasteners, and shank may also include a damper (e.g., a rubber sleeve) disposed near head 12 to dissipate vibration energy transmitted through the masonry, which vibration energy may cause anchor 10 to become loosened in hole 19 over time.
- a damper e.g., a rubber sleeve
- FIG. 6 shows a view of anchor 10 embedded in a hole formed in masonry as viewed in the X-Y plane in the direction of the +Z axis.
- anchor bulge 31 a of anchor after insertion into the masonry hole is deformed in such a manner as to form a more circular bulge 31 a extending about the entire circumference of shank 14 .
- a fracture or crack has formed in the masonry in the Y-Z plane and the crack 40 extends through hole 42 . As will be readily understood by the skilled artisan, such a crack will reduce the amount of available surface contact with hole 42 in the vicinity of its ruptured wall 44 .
- anchor 10 is capable of maintaining a frictional hold between it and wall 44 in the event of a crack formation in any plane.
- an apparatus for forming shaped portion 30 includes a left and right plate 60 a , 60 b having formed thereon respective shaped channels 68 a , 68 b whose surfaces describe forming surfaces 62 and 64 for forming shaped portion 30 of anchor 10 when plates 60 a , 60 b are mated together.
- Forming methods known in the art may alternatively be used to form shaped portion 30 .
- the invention is by no means limited to this or any other particular forming and/or pressing method for manufacture of an anchor.
- the forming process using plates 60 a , 60 b preferably includes placing a heated cylindrical blank (heated to make the metal malleable) into a first channel (e.g., channel 68 a ) and then pressing the two plates together so that the two channels oppose each other to form a cylindrical impression (i.e., shaped portion 30 ) onto the blank.
- Holes 72 a - d and posts 74 a - d are provided on plates 60 a , 60 b to assist in guiding plate 60 a into appropriate alignment with plate 60 b during the pressing operation.
- the anchor is rendered resilient by tempering at an appropriate temperature (as mentioned above).
- shaped portion 30 may be formed by placing the cylindrical blank between and in mating contact with two plates having opposed, complimentary surface contours which together cooperate to form shaped portion 30 (the blank may be heated prior to the forming process, as in the first embodiment, to facilitate deformation of the material).
- One plate is moved relative to the other, which causes the blank to roll between the plates.
- blank begins to roll, it encounters a gradually increasing, first slope formed on the first plate and a second, complimentary slope formed on the second plate.
Abstract
An anchor for masonry. The anchor is relatively smooth walled and is forcibly driven into a hole formed in masonry or other suitable material for purposes of attaching fixtures. When driven into the hole, a shaped portion of the anchor is deformed in such a manner as to facilitate a 360 degree or greater bearing surface with the holes of wall. The walls of the hole impose forces onto the shank along this bearing surface which tend to deform shank into alignment with the hole by primarily elastic deformation so that the resulting frictional forces between the shank and the wall resist dislodgment from the hole.
Description
- The invention relates broadly to an anchor for securing fixtures to masonry or other material, and more particularly, the invention relates to a shaped anchor having a multi-planar bend adapted for engaging a hole wall over an extended surface area so as to provide an increased resistance to dislodgment when the anchor is loaded.
- Anchors for masonry or other structure are known, as in U.S. Pat. Nos. 4,963,062 and 4,828,445 to Giannuzzi. In these anchors, one or more undulations may be formed in the shank. The undulations function as a means for providing a tight fit in the hole for purposes of securing the shank within the hole. The anchor's shank is forcibly driven into the hole. As the shank is forced into the hole, the shank undulation is elastically deformed as it comes into contact with the wall. A frictional fit of the shank in the hole results from the pressure forces exerted on the wall by the shank as it attempts to return to its original shape.
- It would be desirable to have an anchor that provides increased surface area contact between the shank and hole wall resulting from an elastic deformation of the anchor as it is driven into the hole, in a relatively simple manner, without excessive manufacturing or other associated costs, and without requiring a high degree of skill in order to use the anchor in practice. Among the benefits of such an anchor are improved retention forces for the shank within the hole over the same length shank. It would also be desirable to have a 360 degree or greater frictional hold between the shank and the hole in the event that the hole wall becomes weakened, such as by fracture of the mating material in the vicinity of the hole.
- The above needs are met, and the shortcomings of prior art anchors are overcome by the shaped anchor of the invention. According to one embodiment, an anchor for masonry is adapted for being driven into a hole formed in masonry, or another suitable material, in a direction approximately perpendicular to the masonry plane. The anchor includes a head, a shank extending from the head and having an end, the shank including an upper shank portion extending from the head, having a longitudinal axis and defining a nominal shank diameter, and a curved shank portion extending between the upper shank portion and the shank end, the curved shank portion being shaped so as to describe a bearing surface that is disposed at a greater distance from the longitudinal axis than the nominal shank diameter and extends through an angle of less than 360 degrees about the longitudinal axis.
- The shank allows for greater surface contact with the walls of a hole than previously attainable over the same length distance because unlike other known anchors, a frictional engagement may be attained circumferentially and continuously about the shank axis. The shank surface is preferably smooth over its length to minimize any chipping or gauging as the shank is forcibly inserted into the hole (e.g., by striking the head of the anchor with a hammer). There is little skill required to insert shank into the hole. Thus, the anchor of the invention has wide uses and does not require specialized tools or manpower.
- In another embodiment, an anchor for masonry includes a shank having a twisting portion disposed between an upper portion and terminal end. The shank has a longitudinal axis passing through the upper portion and terminal end, wherein when viewed in a first plane, the twisting portion describes one and only one first bend and when viewed in a second plane, perpendicular to the first plane, the twisting portion describes one and only one second and third bends. A bearing surface of the shank is provided which attains one of a 360 degree and greater than 360 degree friction-fit engagement between the hole wall and shank by elastic deformation of the shank as it is driven into the hole, the bearing surface comprising a curved surface formed by the first, second and third bends. In this embodiment, the first bend may approximate a half sine wave and the second and third bends together approximate a full sine wave of a different peak-to-peak extent than the first bend.
- The deformation of shank, when driven into the hole, occurs substantially within the elastic range of the anchor material, thereby creating high elastic restoring forces in the anchor. These restoring forces produce frictional forces between the shank and hole which resist dislodgment from the hole.
- In another embodiment, the shank of the anchor includes an upper end, a lower end, a longitudinal axis passing through the centroid of the cross-sections of the upper and lower ends and a nominal shank outer radius. The anchor further includes a shaped section disposed between the upper and lower ends and including a circumferentially extending portion extending along a length of the shank, the portion taking the shape of an approximately 360 degree bulge in a plane view orientated perpendicular to the longitudinal axis, the outer surface of the bulge gradually increasing in offset distance from the longitudinal axis wherein a maximum radial distance from the nominal shank outer surface occurs at 180 degrees and then returning to a near zero offset from the nominal shank outer surface at approximately 360 degrees, the shape of the bulge being approximated by the equation r=R+H sin2 (Φ/2), wherein r is the radial offset of the bulge outer surface from the longitudinal axis, R is the nominal shank radius, Φ is the angle measured about the longitudinal axis and (R+H) is the maximum radial offset of the bulge outer surface from the longitudinal axis.
- In another embodiment of the invention, a method of securing a masonry anchor in masonry by frictional engagement with the masonry includes the steps providing an anchor including a shank having a longitudinal axis and a first and second shank portion, the first shank portion having a generally circular cross-section when projected onto a plane that is perpendicular to the longitudinal axis and the second shank portion including a generally elliptical cross-section when projected onto the plane, providing a hole in the masonry, the hole having cross-sectional dimensions that are non-conforming to the second shank portion cross-section, forcibly driving the shank into the hole so as to cause the shank to undergo a substantially elastic deformation in the vicinity of the second shank portion, the deformation tending to align the first and second shank portions with the cross-section of the hole and the shank exerting elastic restoring forces on the walls of the hole in response to the elastic deformation, wherein when the first and second shank portions are disposed in the hole, the second shank portion describes an approximately circular cross section.
- Additional features and advantages of the invention will be set forth or be apparent from the description that follows. The features and advantages of the invention will be realized and attained by the structures and methods particularly pointed out in the written description and claims hereof as well as the appended drawings.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation without limiting the scope of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate preferred embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
- FIG. 1A is a perspective view of a first embodiment of an anchor made in accordance with the principles of the invention.
- FIG. 1B is a plan view of the anchor of FIG. 1A inserted into a hole of masonry.
- FIGS. 2A-2D are multiple plan views of the anchor of FIG. 1. The planar views are located according to an X-Y-Z Cartesian coordinate system with the Z-axis being parallel to and co-linear with the longitudinal axis of a shank of the anchor and the planar views lie in the Y-Z and X-Z planes, respectively.
- FIG. 3 is a view of the anchor of FIG. 1 taken along section III-III in FIG. 2A. A head of the anchor of FIG. 1 is not shown.
- FIG. 4 is a geometric illustration of the shank taken along section IV-IV in FIG. 2A used to illustrate a mathematical representation of the surface contours of the shank.
- FIGS. 5A-5B is a view of the anchor inserted into a hole, as viewed in the X-Z and X-Y planes, respectively, showing a bearing surface of the anchor.
- FIG. 6 is a view of the anchor of FIG. 1 embedded into a hole of masonry having a crack in the vicinity of the masonry hole.
- FIGS. 7A and 7B are planar views of a tooling for forming the shank.
- Referring to FIG. 1A, a preferred embodiment of an
anchor 10 is shown in perspective view. Referring to FIG. 1B,anchor 10 is shown inserted into apre-formed hole 19 ofmasonry 18 with anchor being used to attach afixture 6 tomasonry 18.Anchor 10 may be used to attachfixture 6 to the surface of masonry in much the same manner as the anchor described in U.S. Pat. No. 4,963,062, herein incorporated by reference in its entirety.Anchor 10 is forcibly inserted intohole 19 and securely held therein by frictional forces that resist removal ofanchor 10 fromhole 19. -
Anchor 10 includes ashank 14 preferably formed from a solid piece of carbon or stainless steel that is generally circular in cross section. Shank 14 may also be hollow and without anintegral head 12 for purposes of e.g., providing a threading or other type of mount on the inner wall surface of the shank for securing a fastener and/or fastener mount toshank 14. Ashaped portion 30 is formed alongshank 14 to facilitate a frictional hold ofanchor 10 withinhole 19. Ahead 12 is integral withshank 14 at one end and atapered end 28 is formed at the opposite end to assist with guidinganchor 10 intohole 19. Shapedportion 30 is preferably disposed between anupper portion 22 andlower portion 24 ofshank 14, as indicated in FIG. 2B. The outer surface ofshank 14 along upper andlower portions longitudinal axis 16 ofshank 14 whereas the outer surface ofshank 14 at shapedportion 30 describes a three-dimensional bend which deviates from, and extends circumferentially aboutshank axis 16. After forminganchor 10,shank 14 is rendered resilient by tempering the metal at an appropriate temperature to impart memory to the metal so that a subsequent deformation ofshank 14 when inserted into an appropriately sized hole will occur substantially within the elastic range of the material. -
Anchor 10 may be axially driven into a pre-drilled hole of masonry or other material by applying an axial force F to head 12, such as by strikinghead 12 with a hammer.Hole 19, which may be cylindrical, is sized to be slightly greater than the generally circular cross-section ofshank 14. Asanchor 10 advances intohole 19,shank axis 16 aligns with the longitudinal axis ofhole 19 and is axially aligned withhole 19 when fully lodged inhole 19. When shapedportion 30encounters walls 20, the bends formed onshank 14abut walls 20 ofhole 19 because surfaces within this region of shank 14 (i.e., shaped portion 30) extend beyond the dimensions ofhole 19 asanchor 10 is being driven axially intohole 19. Thehole 19, whether it be formed in masonry or another suitable material, are preferably essentially non-compliant relative to the stiffness ofshank 14. Therefore, as shapedportion 30encounters walls 20, the bends of shapedportion 30 will be forced into near alignment withwalls 20 by deformation ofshank 14. The degree of deviation aboutshank axis 16 in shapedportion 30 is suitably chosen to limit deformation to within the elastic range of the material so thatshank 14 will exert a high magnitude opposing force on walls as it seeks to retain its original shape. This opposing force exerted uponwalls 20 creates a frictional engagement betweenanchor 10 andhole 19 which is primarily responsible for providing a resistance to dislodgment of anchor fromhole 19 when external forces are applied to anchor 10. Indeed, when using a material having a high Young's modulus (e.g., 1020 steel),anchor 10 is capable of sustaining loads of several thousands of pounds over a relatively short insertion depth without becoming dislodged frommasonry 18. - The surface of
shank 14 is generally smooth so as to minimize any gauging or chipping ofwalls 19 asanchor 10 is driven intohole 19. Such chipping or gauging ofholes 19 re-shapeshole 19, which can limit the ability ofhole 19 to deformshank 14. If the amount of elastic deformation ofshank 14 is reduced as a result of re-shaping ofhole 19, the corresponding magnitude of restoring force is reduced, which then reduces the amount of frictional holding force ofanchor 10 withinhole 19. - The magnitude of frictional force that will resist dislodgment of
anchor 10 fromhole 19 is proportional to the amount of surface contact achieved betweenshank 14 andwalls 19 as anchor is driven intohole 19. As such, it is desirable to haveshank 14 deform in such a manner as to facilitate contact withholes 19 over a large surface area ofshank 14. It is also desirable to achieve an increased surface contact about the entire circumference ofshank 14, a result heretofore not achievable in the prior art. Such a circumferential, or 360 degree (or greater) surface contact can provide an increased holding force over the same longitudinal extent ofshank 14 and a more reliable frictional hold foranchor 10 inhole 19 in the event of a weakening of the masonry, such as by a crack formed in the vicinity ofhole 19. - The surface counters of
shank 14, and in particular, shapedportion 30 ofanchor 10 will now be described in greater detail, with reference to FIGS. 2A-2D, 3 and 4. As mentioned above, shapedportion 30 includes a three-dimensional bend which deviates from, and extends circumferentially aboutshank axis 16. To assist with the description of the geometry ofshank 14, a X-Y-Z Cartesian coordinate system foranchor 10 is introduced with origin at the junction oflower portion 24 and shapedportion 30, and the Z-axis parallel to and alongshank axis 16 and extending fromtapered end 28 towardshead 12 ofanchor 10. - Referring to FIGS. 2A-2D, each of which show
upper portion 22, shapedportion 30, andlower portion 24, the Z coordinate axis extends approximately along the geometric center of upper andlower portions lower portions shank 14. As illustrated, the three-dimensional, circumferentially extending bend of shapedportion 30 is such that asingle bend 32 appears in the X-Z plane, FIGS. 2A and 2C, and bends 34 and 36 appear in the X-Z plane, FIGS. 2B and 2D. FIG. 3 shows a profile ofshank 14 in the X-Y plane as taken at section III-III in FIG. 2A (head 12 not shown). As can be seen by comparing FIGS. 2A-2D with FIG. 3, bends 32, 34 and 36 together form abulge 31 which extends about the Z coordinate axis with the maximum extent ofbulge 31 being located along the +X axis at a distance H from the outer radius oflower portion 24. -
Bulge 31 is the projection in the X-Y plane of a continuous bend that circumferentially-extends about the Z-axis. As can be seen by comparing FIGS. 2A and 2C with FIGS. 2B and 2D, the outer surface ofbend 32 is located at a greater distance from the Z-axis than is bends 34 and 36. This difference in magnitude between bends 32 and 34, 36 in the X-Z and Y-X planes explains the shape ofbulge 31 seen in FIG. 3, which is asymmetric about the X-axis but symmetric about the Y-axis. The portions ofbulge 31 formed bybends bulge 31 in FIG. 3 in a clockwise direction (i.e., view the portion of bulge in the −Y/−X quadrant first, then −Y/+X quadrant, then +Y/+X quadrant, and then the +Y/−X quadrant), the Z-axis coordinate of this outer surface increases. The nature ofbends - The outer surface of the three-dimensional bend of shaped
section 30 may also be appreciated by a mathematical equation of a curve approximately tracing the path of the circumferentially extending bend of shapedsection 30. For simplicity, a polar equation is used with coordinate origin being coincident with the X-Y-Z coordinate system defined earlier. Referring to FIG. 4, let r be the radial distance of the outer surface ofbulge 31 from the Z-axis; θ (radians) is the angular position of r about the Z-axis, D/2 is the nominal outer surface radial position for lower or upper portion, 22, 24, (D/2+H) is the maximum radial extent ofbulge 31, which corresponds to the peak ofbend 32 in FIG. 2A, L is the length of shapedportion 30, FIG. 2B, as measured along the Z-coordinate axis, and z is the z-coordinate. The coordinates r, θ, z for a point along the bend may be approximated by: - θ=θ
- r=R+H (sin2(θ/2)
- z=(L/(2Π))θ
- From this equation, it can be further appreciated the elliptical shape of
bulge 31. Asshank 14 is inserted into a hole in masonry, or another suitably chosen material, bulge will deform in such a manner as to form a more circular-type bulge. In general, however, it is advantageous that the bulge be such that when deformed by the hole, will tend to conform to the cross-sectional dimensions of the hole as in, e.g., circular for a circular hole, as this can promote a maximum amount of surface contact with the wall surface and/or a circumferentially and continuously extending surface contact. The deformed shape ofbulge 31/bend of shapedportion 30 facilitates a greater-than 360 degree surface contact withwalls 20 ofhole 19 asanchor 10 is driven intohole 19. Referring to FIGS. 5A and 5B, a bearingsurface 50 withwalls 20 ofhole 19 results from the elastic deformation ofshank 14. The nature of this surface contact may be understood by noting the approximate areas ofsurface contact surface 50 extends continuously aboutshank 14. The shape of shapedportion 30 facilitates the creation of this greater than 360degree bearing surface 50 withwalls 20 because thebends walls 19 asshank 14 advances intohole 19, extend circumferentially and continuously about the Z-axis through an angle of nearly 360 degrees. As a result, surfaces disposed about the entire circumference ofshank 14 in the vicinity of shapedsection 30 will be forced into contact withwalls 19 in reaction to wall forces applied to thebends portion 30. This continuously extending,circumferential bearing surface 50 provides a increased surface contact betweenshank 14 andwalls 20, which increases the frictional forces betweenshank 14 andhole 19 over the same length of similar anchors, such as the anchor described in U.S. Pat. No. 4,963,062. (the “'062 patent”). So, for example, if the shank length spanning B1, B2 and P in FIG. 1 of the '062 patent were equal to length L ofanchor 10, FIG. 2B, the surface contact between shank and wall in this prior art anchor would be much less than the surface contact achieved byanchor 10 over this same length L. Thus, according to the invention, an anchor is provided which has a higher holding power then was previously attainable without the need to, e.g., provide additional planar bends in the shank over the length of the shank. It should be noted that the best results are achieved whenanchor 10 has smooth surfaces so thatanchor 10 does not chip or gaugehole 19. This will ensure the. tightest fit in accordance with the shape ofshank 14. The greater than 360 degree, continuous surface contact withwalls 19 is a result of the three-dimensional, asymmetric aspects ofshank 14 that allowshank 14 to be driven intohole 19 and deformed so as to engagewalls 19 on all sides ofshank 14. -
Shank 14 may have a constant, nominal cross-section, as inanchor 10, orshank 14 may have a tapered cross-section (which may require a corresponding tapered hole 19).Shank 14 may be hollow so as to serve as an anchor point for attaching secondary fasteners, and shank may also include a damper (e.g., a rubber sleeve) disposed nearhead 12 to dissipate vibration energy transmitted through the masonry, which vibration energy may causeanchor 10 to become loosened inhole 19 over time. - FIG. 6 shows a view of
anchor 10 embedded in a hole formed in masonry as viewed in the X-Y plane in the direction of the +Z axis. As mentioned above,anchor bulge 31 a of anchor after insertion into the masonry hole is deformed in such a manner as to form a morecircular bulge 31 a extending about the entire circumference ofshank 14. A fracture or crack has formed in the masonry in the Y-Z plane and thecrack 40 extends throughhole 42. As will be readily understood by the skilled artisan, such a crack will reduce the amount of available surface contact withhole 42 in the vicinity of its rupturedwall 44. Ifcrack 40 were formed using an anchor with bends that provide less than a 360 contact, such a crack formation in the masonry may result in a significant loss of surface contact resulting in dislodgment of the anchor fromhole 42. In particular, if an anchor having one or more planar bends is inserted intohole 42 and the plane of such bend(s) correspond substantially to the crack plane (i.e., the Y-Z axis in FIG. 6), the frictional forces retaining the anchor inhole 42 would be reduced since the shank would be allowed to return to its original shape, thereby reducing the elastic forces used to hold the anchor in the hole. The circumferentially and continuously extending surface contact ofanchor 10 addresses this concern for cracked holes by establishing surface contact on all sides ofshank 14. Thus, in FIG. 6, although the crack in the Y-Z plane would diminish the overall frictionalforces holding shank 14 withinhole 42, the portions ofwall 44 not nearcrack 40 may still be usable to exert an effective, opposing force onshank 14 in response to the elastic restoring forces ofshank 14. Thus,anchor 10 according to the invention is capable of maintaining a frictional hold between it andwall 44 in the event of a crack formation in any plane. - Referring to FIGS. 7A and 7B, one embodiment of an apparatus for forming shaped
portion 30 includes a left andright plate channels surfaces portion 30 ofanchor 10 whenplates portion 30. Thus, the invention is by no means limited to this or any other particular forming and/or pressing method for manufacture of an anchor. - The forming
process using plates plates plate 60 a into appropriate alignment withplate 60 b during the pressing operation. After forming shapedportion 30, the anchor is rendered resilient by tempering at an appropriate temperature (as mentioned above). - In a second embodiment, shaped
portion 30 may be formed by placing the cylindrical blank between and in mating contact with two plates having opposed, complimentary surface contours which together cooperate to form shaped portion 30 (the blank may be heated prior to the forming process, as in the first embodiment, to facilitate deformation of the material). One plate is moved relative to the other, which causes the blank to roll between the plates. As blank begins to roll, it encounters a gradually increasing, first slope formed on the first plate and a second, complimentary slope formed on the second plate. These two opposed slopes together cooperate to form the bend of shapedportion 30 as the blank is rolled between the two plates.
Claims (11)
1-21. (Cancelled)
22. A method for inserting an anchor into a masonry hole, comprising:
providing an anchor having a shank, the shank including a curved section that describes a bearing circumferentially extending up to 360 degrees about the longitudinal axis of the shank, and a straight section located adjacent to the bend and extending parallel to the shank longitudinal axis;
driving the anchor into the masonry hole, including deforming the straight section and curved section into a plurality of curved sections which together form a continuous, circumferentially extending bearing surface with the walls of the hole that is greater than 360 degrees.
23. The method of claim 22 , wherein the providing step further includes providing one, and only one curved section on the shank.
24. The method of claim 22 , wherein the providing step further includes providing a smooth walled shank.
25. The method of claim 22 , wherein the deforming step further includes deforming the shank such that the shank conforms to the walls of the hole.
26. A method of inserting an anchor into a masonry hole having walls, comprising the steps of:
providing an anchor including a shank adapted for being forcible driven into the hole and held within by frictionally engagement with the hole walls, wherein the shank includes a first shank portion having an outer surface that is cylindrical in shape and defines a nominal shank radius with respect to a shank axis, and a second shank portion forming a bulge, the bulge providing a bearing surface that is disposed at a greater distance from the longitudinal axis than the nominal shank radius and extends through an angle of approximately 360 degrees about the axis;
forcibly driving the shank into the masonry hole such that the hole does not form a helical groove.
27. The method of claim 26 , wherein the contacting the second end of the bulge with the wall further comprises: engaging a surface of the bulge with the wall in substantially all planes that contain the shank axis.
28. The method of claim 26 , wherein the contacting the second end of the bulge with the wall further comprises: engaging the wall over a contiguous 360 degree area when viewed in a plane perpendicular to the shank axis.
29. The method of claim 26 , wherein the driving step further includes deforming the first shank portion and second shank portion so as to form a first plurality of bends in the shank when viewing the shank in a first plane, and a second plurality of bends when viewing the shank in a second plane perpendicular to the first plane, wherein the first and second plurality of bends describe a contigious, circumferentially bearing surface with the walls of the hole that is substantially greater than 360 degrees.
30. A method for inserting an anchor into a masonry hole having walls, comprising:
providing an anchor having a shank, the shank including a curved section that describes a bearing surface with the walls of the hole that extends approximately 360 degrees about the longitudinal axis of the shank; and
driving the anchor into the masonry hole without forming a helical groove in the walls of the hole.
31. the method of claim 30 , wherein the driving step further includes deforming the curved section into a plurality of curved sections which together form a continuous, circumferentially extending bearing surface with the walls of the hole that is substantially greater than 360 degrees.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/893,329 US20040261355A1 (en) | 2002-10-30 | 2004-07-19 | Shaped anchor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/283,340 US7140826B2 (en) | 2002-10-30 | 2002-10-30 | Shaped anchor |
US10/893,329 US20040261355A1 (en) | 2002-10-30 | 2004-07-19 | Shaped anchor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/283,340 Division US7140826B2 (en) | 2002-10-30 | 2002-10-30 | Shaped anchor |
Publications (1)
Publication Number | Publication Date |
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US20040261355A1 true US20040261355A1 (en) | 2004-12-30 |
Family
ID=32093493
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/283,340 Expired - Fee Related US7140826B2 (en) | 2002-10-30 | 2002-10-30 | Shaped anchor |
US10/893,329 Abandoned US20040261355A1 (en) | 2002-10-30 | 2004-07-19 | Shaped anchor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/283,340 Expired - Fee Related US7140826B2 (en) | 2002-10-30 | 2002-10-30 | Shaped anchor |
Country Status (8)
Country | Link |
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US (2) | US7140826B2 (en) |
EP (1) | EP1416171A1 (en) |
JP (1) | JP2004150257A (en) |
CN (1) | CN1493792A (en) |
AU (2) | AU2003204095B2 (en) |
CA (1) | CA2427792A1 (en) |
TW (1) | TWI229165B (en) |
WO (1) | WO2004042239A2 (en) |
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US20060067805A1 (en) * | 2004-09-29 | 2006-03-30 | Reed Richard W | Crimped nail |
US20110293365A1 (en) * | 2008-12-12 | 2011-12-01 | Vesuvius Crucible Company | Cement plant refractory anchor |
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US20070156154A1 (en) * | 2003-03-28 | 2007-07-05 | Andre Schlienger | Locking Screw |
US20060144007A1 (en) * | 2005-01-06 | 2006-07-06 | Michael Azarin | Coil bar anchor |
US7517425B2 (en) * | 2006-05-18 | 2009-04-14 | Gm Global Technology Operations, Inc. | Method for adhesive bonding of a tubular member to a casting |
CN113482998A (en) * | 2021-08-03 | 2021-10-08 | 安徽江淮汽车集团股份有限公司 | Mud guard fixing bolt |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060067805A1 (en) * | 2004-09-29 | 2006-03-30 | Reed Richard W | Crimped nail |
US20110293365A1 (en) * | 2008-12-12 | 2011-12-01 | Vesuvius Crucible Company | Cement plant refractory anchor |
Also Published As
Publication number | Publication date |
---|---|
CA2427792A1 (en) | 2004-04-30 |
CN1493792A (en) | 2004-05-05 |
WO2004042239A3 (en) | 2004-07-22 |
EP1416171A1 (en) | 2004-05-06 |
TW200406549A (en) | 2004-05-01 |
US20040086358A1 (en) | 2004-05-06 |
WO2004042239A2 (en) | 2004-05-21 |
JP2004150257A (en) | 2004-05-27 |
AU2003301877A1 (en) | 2004-06-07 |
AU2003204095B2 (en) | 2009-06-11 |
US7140826B2 (en) | 2006-11-28 |
TWI229165B (en) | 2005-03-11 |
AU2003204095A1 (en) | 2004-05-20 |
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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Owner name: POWERS FASTENERS, INC., NEW YORK Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:JPMORGAN CHASE BANK, N.A.;REEL/FRAME:028741/0582 Effective date: 20120723 |