Fastener with drill pilot and reversed threaded regions

Patent metadata

Field	Value
Publication number	US-9322422-B2
Application number	US-201313948737-A
Country	US
Kind code	B2
Filing date	Jul 23, 2013
Priority date	Jul 23, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A fastener includes a shank having a pilot section and a threaded section. The pilot section includes a cutting tip and a drill section; the threaded section includes a first thread region having the same twist as the drill section and a reverse thread region. A helical ridge may be provided in the reverse thread region. A head at the second end includes a top portion such as a disk and an undercut region.

First claim

What is claimed is:

1. A fastener, comprising:
a shank having a first end and a second end, and having a diameter, the shank including
a pilot region beginning at the first end and including a drill section having a drill diameter formed by a surface, the surface having a flute formed in the surface, the flute forming at least one turn about a circumference of the surface along a length of the pilot region;
a first thread region adjacent the pilot region having a thread with a twist direction matching a twist direction of the drill section;
wherein the pilot region extends from the first end to the first thread region and has a point diameter adjacent to the first end, the drill diameter being less than the point diameter, the point diameter comprising a diameter of a bore formed by the fastener when the fastener is rotated into a substrate;
a reverse thread region adjacent the first thread region, the reverse thread region having a thread having a twist opposite to the thread in the first thread region; and
a head at the second end.

2. The fastener of claim 1 wherein the pilot region includes a cutting tip including first and second cutting edges and the drill section.

3. The fastener of claim 2 wherein the cutting tip comprises a drill point tip, the flute occupying the pilot region between the cutting tip and the first thread region.

4. The fastener of claim 3 wherein the cutting tip includes a pointed end, the pointed end formed by two cutting edges joined at an angle between 100 and 120 degrees.

5. The fastener of claim 2 wherein the cutting tip has a diameter and the drill section has a diameter smaller than the diameter of the cutting tip.

6. The fastener of claim 5 wherein the thread in the first thread region is a helical thread having a height defining a diameter greater than a diameter of the cutting tip in a range of about 1.5:1-1.2:1.

7. The fastener of claim 2 wherein the pilot region drill section has a helical twist having a pitch greater than a pitch of the thread in the first thread region.

8. The fastener of claim 2 wherein the cutting tip has a length which is about 20-30% of a length of the pilot region.

9. The fastener of claim 1 further including a helical ridge in the reverse thread region having a twist direction matching the thread in the first thread region.

10. The fastener of claim 9 wherein the helical ridge has a height which is less than a height of the thread in the reverse thread region.

11. The fastener of claim 1 wherein the thread in the reverse thread region includes a height which is greater than a minor diameter of the shank in the first thread region in a range of about 1.55:1-1.3:1.

12. The fastener of claim 1 wherein the pilot region has a length which is greater than a length of the reverse thread region by about 2.5:1.

13. The fastener of claim 1 wherein the first thread region has a length which is greater than a length of the reverse thread region, by about 1.8:1.

14. The fastener of claim 1 wherein a pitch of the thread in the reverse thread region is greater than a pitch of the thread in the first thread region in a range of about 1.7:1 to 2:1.

15. A fastener, comprising:
a shaft having a first end and a head at a second end, the shaft including
a pilot region including a cutting tip adjacent to the first end and a drill section positioned extending from the cutting tip, the drill section having a drill diameter formed by a surface, the drill diameter being less than a diameter formed by edges of the cutting tip, the diameter of the cutting tip adapted to create a bore with a matching diameter when the fastener is rotated into a substrate, the drill section including a flute spiraled at least one turn within the drill section and into the surface of the drill section;
a first thread region adjacent to the pilot region having a helical thread with a twist direction matching a twist direction of the flute, the helical thread having a diameter greater than the drill diameter of the drill section;
a reverse thread region adjacent the pilot region, the reverse thread region having a thread with a twist direction opposite the thread in the first thread region, the thread in the reverse thread region having a diameter greater than the diameter of the helical thread; and
the head having a top portion and a bottom portion the bottom portion having a recess.

16. The fastener of claim 15 wherein the flute has a helical twist having a pitch greater than a pitch the thread in the first thread region.

17. The fastener of claim 16 wherein the helical thread in the first thread region has a height greater than the diameter of the cutting tip in a range of about 1.5:1-1.2:1.

18. The fastener of claim 17 further including a helical ridge in the reverse thread region having a twist direction matching the thread in the first thread region, the helical ridge has a height which is less than a height of the thread in the reverse thread region.

19. A fastener having a first end and a second end, comprising:
a pilot region including a cutting tip adjacent to the first end and a drill section positioned adjacent to the cutting tip, the cutting tip having a diameter larger than a diameter of the drill section formed by a surface of the drill section, the drill section including a flute forming at least one turn in the drill section, the flute spiraled in and below the surface of the drill section, the diameter of the cutting tip adapted to create a bore with a matching diameter when the fastener is rotated into a substrate;
a first thread region adjacent to the pilot region having a helical thread with a twist direction matching a twist direction of the flute, the helical thread having a diameter greater than the diameter of the drill section.

20. The fastener of claim 19 further including a reverse thread region adjacent the pilot region, the reverse thread region having a thread with a twist direction opposite the thread in the first thread region, the thread in the reverse thread region having a diameter greater than the diameter of the helical thread.

Assignees

• Simpson Strong Tie Co Inc

Inventors

• Park Jeremy Scott

Classifications

• F16B25/0084

  characterised by geometric details of the tip · CPC title

• F16B25/103 Primary

  by means of a drilling screw-point, i.e. with a cutting and material removing action · CPC title

• F16B25/0057

  the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections · CPC title

• F16B25/0015

  the material being a soft organic material, e.g. wood or plastic (F16B25/0031 takes precedence) · CPC title