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 of a luggage carrier, comparing the viability of drop forgings versus sheet metal pressings.
| Identifier | WestWitteringFiles\D\January1920\ Scan26 | |
| Date | 24th January 1920 | |
| To DA.{Bernard Day - Chassis Design} from R copy to CJ. BM. HS.{Lord Ernest Hives - Chair} CK.{Mr Clark} X.3507. RE LUGGAGE CARRIER ETC. ORIGINAL. R1/G28/1/20. 24.1.20 3 I think it would be advisable to complete the whole design of this luggage carrier, as well as the brackets for the frame. In the design you have sent us I consider the drop forgings suggested are very difficult ones to make and will naturally not come out as thin as shewn in your drawing, in fact I am not sure whether such a drop forging could be considered a practical piece of work. Anyway, it is much more desirable to make this fitting as a sheet metal pressing or punched out of sheet metal. You will see by the suggestions we send you that we think this is quite possible. It has occurred to me that owing to the want of lateral stability that a stay could be fitted from near the hinge of the carrier to about 6 to 8 inches along the back member. This diagonal stay would be roughly at 45° and would, I think, enable a single sheet of steel to be used as a cantilever bracket. The advantages of such a sheet metal is that it permits of simple bolting and can be arranged to form the anchorage for the shock damper fixing. We also send you an old drawing, about 5 1/2 years old, which shews the way we intended to make this fitting at that time. This is of pressed steel of the same section as that used for the step irons, but I am not sure that this is a practical shape, owing to the narrowness of the frame, and the difficulty of bolting it where the cross member joins the frame. (Contd.) | ||