Threaded insert for fasteners

Abstract

A threaded insert for providing stronger threads to a parent material. The threaded insert includes a bushing portion having male threads on the external surface and female threads within an internal bore. The threaded insert also includes keys which lock the threaded insert into a threaded hole within the parent material. The keys are positioned within slots along the external surface of the bushing portion of the threaded insert. The slots include two substantially parallel walls which are substantially perpendicular to a bottom surface of the slots. A method for assembling the threaded insert reduces the tendency of the keys to be installed offset from the bottom surface of the slots.

1 . In a threaded insert having a bushing portion and a key, the bushing portion having a substantially cylindrical shape with a first end, a second end, and a threaded central bore therethrough, the bushing portion having a radially outside surface including male threads throughout the length of the bushing portion and a slot extending substantially longitudinally throughout the length of the bushing portion for receiving the key, the slot having a bottom surface and two walls, the two walls being substantially parallel to each other and substantially perpendicular to the bottom surface, the key having a substantially longitudinal locking portion connected to a substantially longitudinal tang portion, the substantially longitudinal tang portion including a first end, a second end, a radially inside face, a radially outside face, a first side surface and a second side surface, the radially inside face and the radially outside face of the substantially longitudinal tang portion being substantially parallel and having a curved profile with a preset curvature, wherein the radially inside face has a concave surface, and the radially outside face has a convex surface, the substantially longitudinal locking portion including a first end and a second end, the improvement in the threaded insert comprising:
 the substantially longitudinal locking portion having a substantially triangular cross section with a back face and two angled faces, and wherein at the second end of the locking portion the angled faces of the locking portion of the key taper into the radially outside face of the tang portion of the key, and the back face of the triangular cross section is substantially aligned with an apex of the concave surface of the radially inside face of the substantially longitudinal tang portion.   
   
   
       2 . The threaded insert of  claim 1 , wherein the male threads on the radially outside surface of the bushing portion are configured to mate with a threaded hole in a parent material. 
   
   
       3 . The threaded insert of  claim 1 , wherein the threaded central bore of the bushing portion comprises female threads that are configured to mate with a male threaded fastener. 
   
   
       4 . The threaded insert of  claim 1 , wherein the angled faces of the substantially longitudinal locking portion of the key form an intersection that is positioned substantially flush with an outside diameter of the male threads on the radially outside surface of the bushing portion. 
   
   
       5 . The threaded insert of  claim 1 , wherein the angled faces of the substantially longitudinal locking portion of the key form an intersection that is positioned above flush with an outside diameter of the male threads on the radially outside surface of the bushing portion. 
   
   
       6 . The threaded insert of  claim 1 , wherein the substantially longitudinal locking portion of the key extends beyond the first end of the bushing portion. 
   
   
       7 . The threaded insert of  claim 1 , wherein the first side surface and the second side surface of the tang portion of the key are configured to have an interference fit with the two walls of the slot of the bushing portion. 
   
   
       8 . The threaded insert of  claim 1 , wherein:
 the first side surface of the tang portion of the key is substantially perpendicular to a tangent along the radially inside face of the tang portion at the intersection of the first side surface and the radially inside face; and   the second side surface of the tang portion of the key is substantially perpendicular to a tangent along the radially inside face of the tang portion at the intersection of the second side surface and the radially inside face.   
   
   
       9 . The threaded insert of  claim 1 , wherein the taper includes an angled taper. 
   
   
       10 . The threaded insert of  claim 1 , wherein the taper includes a curved taper. 
   
   
       11 . The threaded insert of  claim 1 , further comprising an end surface at the first end of the locking portion of the key, the end surface being substantially perpendicular to the back face and the two angled faces of the locking portion.