Double locked threaded fastener
US4983084A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Sep 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/938
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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 ag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.