Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1989-09-26
1991-01-08
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
411361, 411938, F16B 3930
Patent
active
049830848
ABSTRACT:
A double locked threaded fastening assembly includes a nut and a bolt. The bolt has a head at one end and threads adjacent its other end with a plurality of axially extending grooves located adjacent to the threads intermediate the threads and the bolt head. The nut has a work piece engagement end and a hollow bore extending through that end into the nut. A first portion of the bore proximal to the work piece engagement end is free of threads and a second portion distal from the work piece engagement end includes internal threads. The internal threads of the nut are capable of threading onto the external threads of the bolt to clamp a work piece under a clamping load between the head of the bolt and the nut. The threads of at least one of the internal threads in the nut or the external threads on the bolt are asymmetrical threads which have an essentially planar inclined root surface which intersects the side of the threads leading the root at a first angle and the side of the thread trailing the root at a second angle. These first and second angles are different. The crest of the opposing mating thread frictionally locks against the inclined rool surface when the nut is brought against the work piece at the clamping load. The first portion of the hollow bore of the nut is then swaged into intimate contact with the grooves on the bolt to fix the nut to the bolt against rotation of the nut on the bolt.
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Anderson Terry J.
Block Robert B.
Dino Suzanne L.
Northrop Corporation
Smith Gary L.
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