Threaded extension nut

Abstract

A threaded extension nut for engaging a threading of an anchor bolt for cement-to-lumber connections includes a shaft member with a first end attached to a head and a second end configured to connect to a threaded bolt. The shaft member includes an internal threading, an external chamfer, and an internal chamfer. The apparatus, as claimed, may include a head designed to connect to a tool for applying rotational force. It may also feature a flange providing a locking surface. The threaded opening in the shaft member may extend fully through, at least halfway through, or partially through the shaft member. The shaft member may also include an exterior threading to mate with a mudsill and help maintain a tight threaded extension nut to mudsill connection.

What is claimed is: 
     
         1 . An apparatus for engaging a threading of an anchor bolt for a cement-to-lumber connection, comprising:
 a shaft member with a first end and a second end; and   a head, wherein the first end of the shaft member is connected to the head, wherein the second end of the shaft member is configured to connect to a threaded bolt, and wherein the second end of the shaft member comprises:   an internal threading on an internal surface of the shaft member;   an external chamfer; and   an internal chamfer.   
     
     
         2 . The apparatus of  claim 1 , wherein the head is configured to connect to a tool that is configured to apply a rotational force to the head when the tool is connected to the head. 
     
     
         3 . The apparatus of  claim 1 , further comprising:
 a flange configured to provide a locking surface.   
     
     
         4 . The apparatus of  claim 1 , wherein the internal threading extends fully through the shaft member. 
     
     
         5 . The apparatus of  claim 1 , wherein the internal threading extends at least halfway through the shaft member. 
     
     
         6 . The apparatus of  claim 1 , wherein the internal threading opening extends partially through the shaft member. 
     
     
         7 . The apparatus of  claim 1 , wherein the internal chamfer is configured to facilitate the start of thread engagement when the shaft member is rotated. 
     
     
         8 . The apparatus of  claim 1 , wherein the head is configured to be rotated by a manual wrench, a powered impact wrench, or a pneumatic impact wrench. 
     
     
         9 . The apparatus of  claim 1 , wherein the external chamfer is configured to self-position the apparatus into a lumber clearance opening. 
     
     
         10 . The apparatus of  claim 1 , wherein the external chamfer is configured to compress and push through lumber material in the event of a mis-drilled clearance hole. 
     
     
         11 . The apparatus of  claim 1 , wherein the head is a multi-sided shape. 
     
     
         12 . The apparatus of  claim 1 , wherein the shaft member is made of a steel, a stainless steel, or an alloy steel. 
     
     
         13 . The apparatus of  claim 3 , wherein the flange includes a non-slip surface texture. 
     
     
         14 . The apparatus of  claim 1 , wherein the threaded opening is designed to accommodate a plurality of standard thread sizes. 
     
     
         15 . The apparatus of  claim 1 , wherein the shaft member includes a corrosion-resistant coating. 
     
     
         16 . The apparatus of  claim 1 , wherein shaft member further comprises:
 an external threading on the outer surface of the shaft member.   
     
     
         17 . The apparatus of  claim 1 , wherein the external chamfer has an angle relative to the direction of the shaft member to optimize self-positioning and compression through lumber material, wherein the angle is between fifty-degrees and eighty degrees. 
     
     
         18 . The apparatus of  claim 3 , wherein the flange is connected to the head. 
     
     
         19 . The apparatus of  claim 3 , wherein the flange is welded to the head. 
     
     
         20 . The apparatus of  claim 3 , further comprising:
 a washer, wherein the head, the flange, the washer, and the shaft member are connected together.