Wood fastener

Abstract

Fasteners are provided that include a head and having a head, a tip end having a tip, a first body portion having right-hand threads, and a second body portion having left-hand 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. The right-hand threads, and the left-hand threads, can have a pitch angle α of less than about 60°.

1 . 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 right-hand threads having a pitch angle α of 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 left-hand threads.   
     
     
         2 . The fastener of  claim 1 , wherein the right-hand threads have a pitch angle α that is from about 20° to about 40°. 
     
     
         3 . The fastener of  claim 1 , wherein the pitch angle of the right-hand threads comprises:
 a first internal angle β that is from about 20° to about 30°; and   a second internal angle γ that is from about 0° to about 10°.   
     
     
         4 . The fastener of  claim 1 , wherein at least one of the first three fully formed right-hand threads on the first body portion includes serrations. 
     
     
         5 . The fastener of  claim 1 , wherein the second distance of the second body portion is less than the first distance of the first body portion. 
     
     
         6 . The fastener of  claim 1 , wherein the second distance of the second body portion is equal to or less than about one quarter of an inch. 
     
     
         7 . The fastener of  claim 1 , wherein the left-hand threads have a pitch angle α of less than about 60°. 
     
     
         8 . The fastener of  claim 1 , wherein the left-hand threads have a pitch angle α that is from about 20° to about 40°. 
     
     
         9 . The fastener of  claim 1 , wherein the pitch angle of the left-hand threads comprises:
 a first internal angle β that is from about 20° to about 30°; and   a second internal angle γ that is from about 0° to about 10°.   
     
     
         10 . 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 right-hand threads having a pitch angle α from about 20° to about 40°; 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 left-hand threads having a pitch angle α from about 20° to about 40°.   
     
     
         11 . The fastener of  claim 10 , wherein the pitch angle of the right-hand threads comprises:
 a first internal angle β that is from about 20° to about 30°; and   a second internal angle γ that is from about 0° to about 10°.   
     
     
         12 . The fastener of  claim 10 , wherein at least one of the first three fully formed right-hand threads on the first body portion includes serrations. 
     
     
         13 . The fastener of  claim 10 , wherein the second distance of the second body portion is less than the first distance of the first body portion. 
     
     
         14 . The fastener of  claim 10 , wherein the second distance of the second body portion is equal to or less than about one quarter of an inch. 
     
     
         15 . The fastener of  claim 10 , wherein the pitch angle of the left-hand threads comprises:
 a first internal angle β that is from about 20° to about 30°; and   a second internal angle γ that is from about 0° to about 10°.   
     
     
         16 . 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 as a 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 as right-hand threads on a first body portion of the fastener pass through the metal panel;   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 as left-hand threads on a second body portion of the fastener pass through the metal panel; 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.   
     
     
         17 . The method of  claim 16 , wherein the step of removing the bur of metal comprises:
 contacting the bur of metal with the left-hand threads on the second body portion of the fastener; and   detaching the bur of metal as the left-hand threads pass through the metal panel.   
     
     
         18 . The method of  claim 16 , wherein the step of removing the bur of metal comprises:
 contacting the bur of metal with one or more right-hand threads having serrations; and   detaching the bur of metal as the one or more right-hand threads having serrations pass through the metal panel.