WOOD FASTENER

• US 20150052735A1
• Filed: 11/04/2014
• Published: 02/26/2015
• Est. Priority Date: 03/02/2010
• Status: Active Grant

• Current Assignee: Atlas Bolt & Screw Co. LLC (Berkshire Hathaway Incorporated)
• Original Assignee: Atlas Bolt & Screw Co. LLC (Berkshire Hathaway Incorporated)
• Inventors: Kochheiser, Michael A.
• Granted Patent: US 9,353,784 B2
• Time in Patent Office: Days
• US Class Current: 29/525.11
• CPC Class Codes: F16B 25/0031 the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
• CPC Class Codes: F16B 25/0052 the ridge having indentations, notches or the like in order to improve the cutting behaviour
• CPC Class Codes: F16B 25/0057 the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
• CPC Class Codes: F16B 25/0084 characterised by geometric details of the tip
• CPC Class Codes: Y10T 29/49963 Threaded fastener
• CPC Class Codes: Y10T 29/49964 At least one part nonmetallic

Abstract

Fasteners are provided that include a head and having a head, a tip end having a tip, a first body portion having first threads having a pitch angle, and a second body portion having second threads, the second threads having a different pitch than the first threads. The first body portion is adjacent to the tip end of the fastener and extends a first distance along a length of the fastener towards the head end. The second body portion is adjacent to the first body portion, and extends the head end of the fastener and extending a second distance along the length of the fastener towards the head end.

Claims

1. A method of installing a fastener to secure a metal panel to a wood structural element is provided that comprises the steps of:

creating a bur of metal with a tip of the fastener as the tip of the fastener penetrates the metal panel;

causing an area of the metal panel immediately surrounding the fastener to pull away from the wood structural element with first threads on a first body portion of the fastener as the first threads pass through the metal panel, the first threads having a first diameter and a first pitch;

removing the bur of metal as the fastener passes through the metal panel;

pushing the area of the metal panel towards the wood structural element with second threads on a second body portion of the fastener as the second threads pass through the metal panel, the second threads having a second diameter that is greater than the first diameter of the first threads, and a second pitch that is different from the first pitch of the first threads; and

contacting the wood structural element with the area of the metal panel prior to the area of the metal panel being contacted with a head of the fastener or a sealing washer adjacent to the head of the fastener.

2. The method of claim 1, wherein the step of removing the bur of metal comprises:

contacting the bur of metal with the second threads on the second body portion of the fastener; and

detaching the bur of metal with the second threads as the second threads pass through the metal panel.

3. The method of claim 1, wherein at least one of the first three fully formed first threads on the first body portion includes serrations and the step of removing the bur of metal comprises:

contacting the bur of metal with the at least one fully formed first threads having serrations; and

detaching the bur of metal as the at least one of the fully formed first threads having serrations pass through the metal panel.

4. The method of claim 1, wherein the first threads are triple lead threads configured to provide about 0.2 inches of forward travel per revolution of the fastener.

5. The method of claim 1, wherein the first threads have a pitch angle α

that is less than about 60°

, and the method further includes the geometric configuration of the first threads performing a step of resisting back out over time.

6. The method of claim 5, wherein the first threads have a pitch angle α

that is about 45°

.

7. The method of claim 6, the pitch angle of the first threads comprising:

a first internal angle β

that is about 40°

; and

a second internal angle γ

that is 5°

.

8. The method of claim 1, wherein the second distance of the second body portion is less than the first distance of the first body portion.

9. The method of claim 1, wherein the second threads are right-hand threads.

10. A method of installing a fastener to secure a metal panel to a wood structural element is provided that comprises the steps of:

creating a bur of metal with a tip of the fastener as the tip of the fastener penetrates the metal panel;

causing an area of the metal panel immediately surrounding the fastener to pull away from the wood structural element with first threads on a first body portion of the fastener as the first threads pass through the metal panel, the first threads being right hand threads having a first diameter and a first pitch, with a pitch angle α

that is from about 20°

to about 50°

;

removing the bur of metal as the fastener passes through the metal panel;

pushing the area of the metal panel towards the wood structural element with second threads on a second body portion of the fastener as the second threads pass through the metal panel, the second threads having a second diameter that is greater than the first diameter of the first threads, and a second pitch that is different from the first pitch of the first threads;

contacting the wood structural element with the area of the metal panel prior to the area of the metal panel being contacted with a head of the fastener or a sealing washer adjacent to the head of the fastener.

12. The method of claim 11, wherein the step of removing the bur of metal comprises:

contacting the bur of metal with the second threads on the second body portion of the fastener; and

detaching the bur of metal as the second threads pass through the metal panel.

13. The method of claim 11, wherein at least one of the first three fully formed first threads on the first body portion includes serrations and the step of removing the bur of metal comprises:

contacting the bur of metal with the at least one fully formed first threads having serrations; and

detaching the bur of metal as the at least one fully formed first threads having serrations pass through the metal panel.

14. The method of claim 11, the pitch angle of the first threads comprising:

a first internal angle β

that is about 40°

; and

a second internal angle γ

that is about 5°

;

wherein the method further includes the geometric configuration of the first threads performing a step of resisting back out over time.

15. A fastener comprising:

a head and having a head;

a tip end having a tip;

a first body portion that is adjacent to the tip end of the fastener and extends a first distance along a length of the fastener towards the head end, the first body portion including first threads having a first diameter, a first pitch, and a pitch angle α

that is less than about 60°

; and

a second body portion that is adjacent to first body portion and extends a second distance along the length of the fastener towards the head end, the second body portion including second threads, the second threads having a second diameter, and a second pitch that is different from the first pitch of the first threads second pitch.

16. The fastener of claim 15, wherein the pitch angle α

is about 45°

.

17. The fastener of claim 15, wherein the first threads have a pitch angle α

that is from about 20°

to about 50°

.

18. The fastener of claim 17, wherein the pitch angle of the first threads comprises:

a first internal angle β

that is from about 20°

to about 40°

; and

a second internal angle γ

that is from about 0°

to about 10°

.

19. The fastener of claim 15, wherein the second diameter of the second threads is greater than the first diameter of the first threads.

20. The fastener of claim 15, wherein the first threads are triple lead threads configured to provide about 0.2 inches of forward travel per revolution of the fastener.