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).
The design of spring clips and plates to resist sideways forces.
| Identifier | ExFiles\Box 80\2\ scan0143 | |
| Date | 1st May 1920 | |
| (3). (4). When the spring flexes the plates slide on one another and thus tend to rock the clip. This action also tends to twist the clip.about an axis through the centre of the holding-down bolt, because the clip may be loaded more one one side than the other. In investigating these various actions and considering that we have no nibs and slots, and therefore that the clips are going to do all the work, we came to the conclusion that if the second clip is going to be asked to take any sideways load it would have to be much heavier and stronger.than the present clip because it is further down the spring and also because it embraces more plates, and therefore is longer. Mr Woodhead said that he would like to turn down the ends of the second plate so as to grip the bottom plate and thus call two solid plates into action to resist the sideways forces, and in view of this and the other considerations regarding the clips, we suggest that the best arrangement would be to lock the two bottom plates together in this way, or the three bottom plates be adding another pair of projections pointing upwards, and so still keeping one special plate only, and to say that these two or three plates take all the sideways forces, and that the clip which we provide merely prevents the spring from coming apart, and does not actual work. Mr Woodhead is of opinion that it is not necessary to hold the two top plates, as the centre fixing holes these for all practical purposes, so that our clip would hold 6 plates from actually becoming displaced, but by means of clearance would not itself do any side work. We have suggested on "N" Sch: 334 R.R. 225 A (100) T.(R)F.{Mr Friese}(18-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460 CONS O/Q(20) 919 & M.B L. O(617/23) N. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Contd. | ||