CA2583072A1 - Self-drilling anchor - Google Patents
Self-drilling anchor Download PDFInfo
- Publication number
- CA2583072A1 CA2583072A1 CA002583072A CA2583072A CA2583072A1 CA 2583072 A1 CA2583072 A1 CA 2583072A1 CA 002583072 A CA002583072 A CA 002583072A CA 2583072 A CA2583072 A CA 2583072A CA 2583072 A1 CA2583072 A1 CA 2583072A1
- Authority
- CA
- Canada
- Prior art keywords
- drilling
- anchor according
- distal portion
- self
- self drilling
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract 66
- 239000000463 material Substances 0.000 claims abstract 9
- 238000005728 strengthening Methods 0.000 claims 13
- 230000003313 weakening effect Effects 0.000 claims 8
- 239000000758 substrate Substances 0.000 claims 6
- 238000009434 installation Methods 0.000 claims 4
- 238000000034 method Methods 0.000 claims 4
- 230000004323 axial length Effects 0.000 claims 2
- 230000007704 transition Effects 0.000 claims 1
Landscapes
- Joining Of Building Structures In Genera (AREA)
- Dowels (AREA)
Abstract
A self drilling anchor for use in a friable material mounted on a member comprises an elongated body having an axis, an axial bore adapted to receive an elongated fastener, a flared end having torque transmitting surfaces therein, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite the flared end, wherein the proximal portion has a threaded exterior having a root, a crest diameter, and a thread height, the intermediate portion has a threaded exterior having a root, a crest diameter substantially smaller than the crest diameter of the proximal portion, and a thread height substantially smaller than the thread height of the proximal portion, and the distal portion has a threaded exterior with a root that tapers toward the drilling tip, a crest diameter substantially smaller than the crest diameter of the proximal portion, and a thread height substantially smaller than the thread height of the proximal portion.
Claims (36)
1. A self drilling anchor for use in a friable material, comprising:
a thin-walled, elongate body having an axis, an exterior thread, an axial bore adapted to receive a fastener, a proximal end, and a drilling end opposite the proximal end; and a strengthening member disposed on said body;
wherein the exterior thread and said strengthening member together provide sufficient structural support to said body to withstand a torsion force required for the drilling end to penetrate a substrate adjacent the friable material, the substrate having a hardness greater than the hardness of the friable material.
a thin-walled, elongate body having an axis, an exterior thread, an axial bore adapted to receive a fastener, a proximal end, and a drilling end opposite the proximal end; and a strengthening member disposed on said body;
wherein the exterior thread and said strengthening member together provide sufficient structural support to said body to withstand a torsion force required for the drilling end to penetrate a substrate adjacent the friable material, the substrate having a hardness greater than the hardness of the friable material.
2. The self drilling anchor according to claim 1, said strengthening member comprising at least one spline disposed longitudinally along and extending radially into the axial bore.
3. The self drilling anchor according to claim 1, said strengthening member comprising at least two splines, the splines having a radial extent defining an inner diameter of the axial bore, wherein the inner diameter of the axial bore is less than the outer diameter of threads of the fastener and greater than a root diameter of the fastener.
4. The self drilling anchor according to claim 1, said strengthening member comprising at least one axial rib disposed on said body.
5. The self drilling anchor according to claim 1, wherein said strengthening member comprises a drilling thread proximate the drilling end.
6. The self drilling anchor according to claim 1, said body further comprising a proximal portion adjacent the proximal end, a distal portion adjacent the drilling end, and an intermediate portion therebetween, wherein said first strengthening member comprises a second exterior thread on the intermediate portion.
7. The self drilling anchor according to claim 1, said strengthening member comprising at least one spline disposed longitudinally along and extending radially into the axial bore, and a second strengthening member comprises at least one axial rib disposed on said body.
8. The self drilling anchor according to claim 7,, wherein a third strengthening member comprises a drilling thread proximate the drilling end.
9. The self drilling anchor according to claim 7, said body further comprising a proximal portion adjacent the proximal end, a distal portion adjacent the drilling end, and an intermediate portion therebetween, wherein a third strengthening member comprises a second exterior thread on the intermediate portion.
10. The self drilling anchor according to claim 1, said body further comprising a wall thickness in the range of about 0.01 inch to about 0.05 inch, and preferably in the range of about 0.015 inch to about 0.03 inch, and most preferably of about 0.025 inches.
11. The self drilling anchor according to claim 1, wherein said body tapers from the proximal end to the drilling end.
12. The self drilling anchor according to claim 1, wherein the thread height of he exterior thread tapers from the proximal end to the drilling end.
13. The self drilling anchor according to claim 1, said body further comprising a proximal portion adjacent the proximal end and a distal portion adjacent the drilling end, wherein the thread height of the exterior thread on the proximal portion is greater than the thread height of the exterior thread on the distal portion.
14. The self drilling anchor according to claim 13, said body further comprising an intermediate portion between the proximal portion and the distal portion, wherein the thread height of the exterior thread on the intermediate portion is less than the thread height of the exterior thread on the proximal portion.
15. The self drilling anchor according to claim 1, said body further comprising a proximal portion adjacent the proximal end and a distal portion adjacent the drilling end, wherein the axial length of the distal portion is greater than the thickness of the friable material.
16. The self drilling anchor according to claim 1, said body further comprising a proximal portion adjacent the proximal end, a distal portion adjacent the drilling end, and an intermediate portion therebetween, wherein the axial length of the intermediate portion and the distal portion is greater than the thickness of the friable material.
17. The self drilling anchor according to claim 1, said body further comprising a flange at the proximal end having torque transmitting surfaces therein, wherein the flange has at least one weakening element, whereby the flange separates from said body during installation.
18. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end having at least one weakening element, whereby the drilling end at least partially separates from said body during installation.
19. The self drilling anchor according to claim 18, wherein the at least one weakening element is a notch in the exterior thread.
20. The self drilling anchor according to claim 18, wherein the at least one weakening element is a transition between the first diameter of the axial bore to a second diameter of the axial bore.
21. The self drilling anchor according to claim 18, wherein the at least one weakening element is a perforation of the wall of said body.
22. The self drilling anchor according to claim 18, wherein the at least one weakening element is an axial groove in the said body.
23. The self drilling anchor according to claim 18, wherein the at least one weakening element is at least one axial slit in said body, and preferably a set of evenly spaced axial slits in said body.
24. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end and a proximate portion adjacent the proximate end, wherein the thickness of the wall of said body at the distal portion is less than the thickness of the wall of said body at the proximate portion, such that threads of the fastener only penetrate through the wall of said body at the distal portion during installation.
25. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end, a proximate portion adjacent the proximate end, and an intermediate portion therebetween, wherein the thickness of the wall of said body at the intermediate portion is less than the thickness of the wall of said body at the proximate portion, such that threads of the fastener only penetrate through the wall of said body at the intermediate portion during installation
26. The self drilling anchor according to claim 1, wherein the drilling end has a flat portion.
27. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end, wherein the drilling end comprises a terminating edge of the distal portion.
28. The self drilling anchor according to claim 27, wherein a centering element is disposed on the drilling end.
29. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end having at least one wing protruding radially outwardly from the distal portion.
30. The self drilling anchor according to claim 29, wherein the at least one wing is integral with a drilling thread on the distal portion.
31. The self drilling anchor according to claim 29, wherein the at least one wing protrudes downwardly and terminates in a pointed end.
32. The self drilling anchor according to claim 1, said body further comprising a distal portion adjacent the drilling end, wherein the axial bore does not extend into the distal portion.
33 33. A method for installing a self drilling anchor and a fastener in friable material and substrate adjacent thereto, the substrate having a hardness greater than the hardness of the friable material, comprising the steps of:
providing an anchor comprised of thin-walled, elongate body having an axis, an exterior thread, an axial bore adapted to receive the fastener, a proximal end, a drilling end opposite the proximal end, and a strengthening member disposed on said body;
applying a torsion force to said anchor to drive the drilling end through the friable material and into the substrate, wherein the exterior thread and said first strengthening member together provide sufficient structural support to said body for said body to withstand such torsion force; and inserting the fastener into said axial bore.
providing an anchor comprised of thin-walled, elongate body having an axis, an exterior thread, an axial bore adapted to receive the fastener, a proximal end, a drilling end opposite the proximal end, and a strengthening member disposed on said body;
applying a torsion force to said anchor to drive the drilling end through the friable material and into the substrate, wherein the exterior thread and said first strengthening member together provide sufficient structural support to said body for said body to withstand such torsion force; and inserting the fastener into said axial bore.
34. The method according to claim 33, wherein a distal portion of the anchor body proximate the drilling end is frangible, such that the step of inserting the fastener into the axial bore causes the distal portion to at least partially separate from said body.
35. The method according to claim 33, wherein the axial bore of said anchor has a first diameter proximate the proximal end and a second diameter proximate the drilling end, the first diameter being greater than the second diameter, and the second diameter being less than the outer diameter of threads of the fastener, such that the step of inserting the fastener into the axial bore causes the distal portion to at least partially separate from said body.
36. The method according to claim 33, wherein said body has a flange at the proximal end having torque transmitting surfaces and at least one weakening element, such that the flange separates from said body when the drilling end drills into the substrate.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US51070803P | 2003-10-10 | 2003-10-10 | |
| US60/510,708 | 2003-10-10 | ||
| US10/844,706 | 2004-05-12 | ||
| US10/844,706 US7934895B2 (en) | 2003-10-10 | 2004-05-12 | Self-drilling anchor |
| CA2483811A CA2483811C (en) | 2003-10-10 | 2004-10-05 | Self-drilling anchor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2483811A Division CA2483811C (en) | 2003-10-10 | 2004-10-05 | Self-drilling anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2583072A1 true CA2583072A1 (en) | 2005-04-10 |
| CA2583072C CA2583072C (en) | 2010-02-16 |
Family
ID=38445913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2583072A Expired - Lifetime CA2583072C (en) | 2003-10-10 | 2004-10-05 | Self-drilling anchor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2583072C (en) |
-
2004
- 2004-10-05 CA CA2583072A patent/CA2583072C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2583072C (en) | 2010-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |