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).
Design suggestions for a highly stressed hinge, sheet metal brackets, and a luggage grid.
| Identifier | WestWitteringFiles\D\January1920\ Scan27 | |
| Date | 28th January 1920 | |
| To D.A. From R.{Sir Henry Royce} -2- R1/G28/1/20 Contd. I do not suggest that you follow drawing Lec.178, but the design may be useful. The highly stressed type of hinge is easily applied if you make the bracket of sheet metal. The suggestion is that the sheetmetal may be somewhere about .200" thick, but as it is an easy thing that could be cut out of a piece of sheet steel of fairly high elasticity, you could try several thicknesses. I do not think this type of bracket would do without the diagonal stay before mentioned, but with the diagonal stay it seems preferable to even the drop forging shewn on your drawing, which might be found insufficiently rigid in front of the rear cross member at section marked DD. Referring to the grid to carry the luggage, you will notice that I have suggested that it is made of tubing brazed up like a cycle frame. I think this would be quite practical and would give you a certain amount of lateral stability, which is required, and will help the brackets very materially, instead of throwing so much duty upon them in a lateral direction. We do not know why the centre of the grid is carried so high up, and you will observe in the drawing that we had made, that we fitted a bar or tube across the back of the body to keep the luggage off the body and to help with the hinged joints shewn in this particular design. I have no objection, however, to the highly stressed hinge if it is found to have less limitations. It is in connection with this luggage grid that we have another design which originated in a discussion here with Mr. Olley, (Contd.) | ||