From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from Rudge-Whitworth Ltd discussing a new design for a locknut and enclosing related blueprints.
| Identifier | ExFiles\Box 159\7\ scan0131 | |
| Date | 19th September 1925 guessed | |
| envelope the threads. Both the serrations and the method of turning over, though perfectly practicable and in our experience, at any rate, have given perfect results, yet they have always been met with criticisms on the ground either of appearance or the possibility of damage to the serrations, or the extreme difficulty of making the thread underneath the turned over flange, and we have recently produced a locknut which is free from these disadvantages, while it is even simpler and lighter than its predecessor. It consists of a drawn up locknut with a conical flange but not turned over, and this conical flange is made into a 12 sided polygon and then covered in by a thin brass of white metal cap which not only fits over the 12 sided polygon, but comes down the cone seating and also fills up the back of the nut. We enclose Blue Print No.7774 x 5 illustrating this locknut which we have provisionally protected, and also photographs of the locknuts originally on the Car, and those with the 12 sided polygon. We also enclose Blue Print No.7407 x 3 illustrating the locknut fitted to your Cars and the Austro-Daimler. While the later 12 sided polygon nut actually fitted to the Car has a flat end, it could be made of any shape to please the eye and could be embossed with any device required by the Car Maker. Yours faithfully, FOR RUDGE-WHITWORTH LTD (sgd) John Pugh Managing Director. | ||