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 notes and sketches for various bonnet fastener components and mechanisms.
| Identifier | WestWitteringFiles\Q\January1927-March1927\ 8 | |
| Date | 14th February 1927 guessed | |
| (3) Fig.4. Leather face. This pot can be used instead of lip to prevent bonnet being lifted when locked. This spring is made from ribbon on edge (many RR. springs similar.) Increased dia. & long enough: too small in the past. Strong stem because subject to much bending stress. Packing so that the whole can follow the bonnet as it varies and settles. This is assuming that our new idea is not a success. Fig. 5. Liner = pad, etc. Rod clears bonnet. Plan of Fig. 1. Bonnet. Fig. 6. Here is a scheme for a detail which I think promises to be simple and sound. The gear wheel has a large dia. boss. 2 cuts are milled for ends of sliders: afterwards plain holes are bored for headless pins, which are just pushed in, and the whole runs between faces which prevent these pins coming out. Centre pin may be slightly shouldered but features of the bonnet may imprison this in the same way. I am anxiously awaiting the report of a trial of the new bonnet fasteners because this is simple when one realises that it should effectively pull in the bonnet as well as hold it down. fig.3. Naturally a pin can be used instead of hook or lip shewn in fig.4. This would be more like a small edition of the spring pot shewn in fig.4. In all cases ample clearance is needed (vertically). A pin was my first idea. I send you most of my thoughts but I hope you will do something better. You will see I have avoided some of the less robust construction. Suggest a trial thus Stop plate. Pinion NO CROSS HOLE POSSIBLE Jig should press pinion on as cap & drill & countersink holes together. Never remove pinion but tap & insert screws to finish in place. R.{Sir Henry Royce} | ||