Bolt and nut thread friction locking device with opposite hand t

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Structure is coaxial – distinct member that restricts nut piece

Patent

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Details

4119291, 411932, F16B 3916

Patent

active

058554637

ABSTRACT:
A friction thread locking device assembly consisting of several components, which are so constructed and assemble to resist the rotational effects of vibration forces. The resistance is achieved by the use and placement of opposing threads (right and left hand threads) with differing threads per inch and the containment of a compressed spring force and the use of the clearance between matching female and male threads. This bolt and nut assembly by unique construction, combines and improves the aspects of the standard bolt and nut with a spring lock washer. The outer nut and inner nut matching threads are axially aligned and the two are threaded together in opposite directions to compresses the captured spring(s) or lock washer(s). This preloaded, three part assembly with matching inner female threads on both the outer nut and inner nut are axially aligned with each other is then rotated onto the threaded rod with matching male threads. Once in place the outer nut and inner nut are rotated in the opposite direction from each other, which transfers the preload to the male threaded shaft threads. This is due to the clearance between the two sets of male and female threads and to the threads per inch difference between the two sets. The inner nut and outer nut of the assembly can only be rotated in an opposite direction until they meet the resisting force of the opposite hand thread interaction. The assembly is now in a load condition whereas to loosen itself from the rod threads it must tighten itself against and overcome the spring force of the spring lock washer(s) or spring(s).

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