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).
Treatment of rivetless bonnets and concealed hinges, comparing manufacturing methods with other car makers.
| Identifier | Morton\M9\ img015 | |
| Date | 22th June 1931 | |
| ORIGINAL To Ey. From Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} c. to Sg.{Arthur F. Sidgreaves - MD} E.{Mr Elliott - Chief Engineer} c. to Ey. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}5/KT.22.6.31. 8385. RIVETLESS BONNETS. With reference to EV{Ivan Evernden - coachwork}2/18.6.31. we attach sketched of the treatment of rivetless bonnet hinges as used on many of the present day cars. The Morris type of hinge is generally used by the lower priced car manufacturers, is rivetless, weldless and looks quite well; it is only used for sheet steel bonnets. The Armstrong Siddeley use an aluminium bonnet without rivets and obtain a good looking job at small cost. The thickness of their sheet aluminium is .068", this rolling over treatment we think can be carried out successfully with aluminium up to .100" thick; our standard .080" thick bonnet material can be rolled and flattened successfully without cracking. In all these schemes the side bonnet hinge is below the corner and it is apparently the only method to use if it is desired to obtain a really concealed hinge. It appears worth while to make up a bonnet on the Armstrong Siddeley principle. The rolling over is relied upon entirely to keep the hinge in place. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} Print att. | ||