Fastener with head cutting structure

Patent metadata

Field	Value
Publication number	US-10480559-B2
Application number	US-201414536071-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	May 10, 2012
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A fastener includes a shank having a point at a first end and a second, head end. A head structure at the head end includes a top portion and having a cutting structure, the cutting structure comprising four planar walls, each wall engaging the shank at an angle, each wall adjoining an adjacent wall by a rounded edge.

First claim

What is claimed is:

1. A fastener, comprising:
a shank having a first end and a second end, the shank having at least a first region having a first helical thread having a first effective diameter; and
a head positioned at the second end of the shank, the head having a top portion including a disk having a diameter, a top surface and a bottom surface, and having a cutting structure, the cutting structure comprising four walls, each wall comprising a first arcuate portion and a second arcuate portion, each wall engaging the shank at an angle, each wall engaging the bottom surface of the disk at a non-normal angle and a plurality of rounded edges, one of the plurality of rounded edges positioned between each of two adjacent walls.

2. The fastener of claim 1 wherein the cutting structure has a square cross-section formed by four walls ( 153 ) intersecting the top portion, each wall defined on two sides by two of said plurality of rounded edges, the plurality of said rounded edges being straight relative to each adjacent wall.

3. The fastener of claim 1 wherein the cutting structure has a square cross-section formed by four walls intersecting the second end of the shank.

4. The fastener of claim 1 wherein each of the plurality of rounded edges ( 263 ) makes a one-eighth turn from a point intersecting the shank to a point intersecting a bottom surface of a disk at the top portion of the head.

5. The fastener of claim 1 wherein the head includes a triangular edged nib ( 143 ) extending out from the top portion of the head and bisecting each wall.

6. The fastener of claim 1 wherein the walls intersect the bottom surface with at least one beveled edge ( 153 a/b ) per wall between the walls and the bottom surface.

7. The fastener of claim 1 wherein each wall engages the bottom surface of the disk at a beveled edge, and the beveled edge ( 153 a/b ) per wall is bisected by the nib.

8. The fastener of claim 1 wherein the first arcuate portion ( 192 ) and the second arcuate portion ( 194 ) form different angles with the shank.

9. A wood screw fastener, comprising:
a shank having a point at a first end and a second end, and having a base shank diameter, and
a head at the second end comprising a disk having a top surface and a bottom surface defining a diameter, and a structure having four walls forming a square cross-section smaller than the diameter of the head, each wall comprising a first arcuate portion and a second arcuate portion, each wall intersecting the bottom of the disk and the shank, and a plurality of rounded edges, one of the plurality of rounded edges positioned between two adjacent walls.

10. The fastener of claim 9 wherein for the four walls ( 153 ) intersecting the shank, each of the plurality of rounded edges includes a first straight side abutting a first wall and a second straight side abutting a second wall.

11. The fastener of claim 9 wherein each wall intersects the shank and the bottom of the disk at an angle.

12. The fastener of claim 9 wherein each rounded edge ( 263 ) makes a one-eighth turn from a point intersecting the shank to a point intersecting a bottom surface of the disk.

13. The fastener of claim 9 wherein the head further includes a nib extending out from a bottom surface of the disk and bisecting each wall, each nib having a triangular cross-section.

14. The fastener of claim 9 wherein walls intersect the bottom surface with at least one beveled edge ( 153 a/b ) per wall between the walls and the bottom surface.

15. The fastener of claim 14 wherein the at least one beveled edge ( 153 a/b ) per wall is bisected by a nib bisecting each wall.

16. The fastener of claim 9 wherein the arcuate first portion and the section arcuate portion form different angles with the shank.

Assignees

• Simpson Strong Tie Co Inc

Inventors

• Park Jeremy Scott

Classifications

• F16B25/0036 Primary

  characterised by geometric details of the screw · CPC title

• F16B25/0073

  characterised by its pitch, e.g. a varying pitch · CPC title

• F16B25/0063

  with a non-threaded portion on the shaft of the screw · CPC title

• F16B25/0015 Primary

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

• F16B35/065

  with self-countersink-cutting means · CPC title