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).
Discussion with sketches on improving the design of springs and catches for increased reliability and reduced stress.
| Identifier | ExFiles\Box 180\M6\ img009 | |
| Date | 24th November 1929 guessed | |
| 2 Naturally we are all out to increase the efficiency and reduce the cost & I believe the best way is to make the most reliable job possible. I am sending you further sketch of my suggested treatment of the spring. RR go to much trouble to round the rags & slot in the pin. I believe it is due to broken springs. so I have suggested we try this which I believe has less stress on the steel. In treatment of the catch I now prefer that the notched plate is outside. Annotations: [By top right sketch] I think your model too small in dia & split pin & also should be more robust. [By C-shaped spring sketch] Should lie on here for part of the circumference end of the steel [In left margin, sideways] It is not Frank Parnell's idea. their drafts, which would need to meet lubrication, this is a separate issue. [By bottom left sketch] notched plate has tongue to drive pin as before but is now riveted on to pin. if need diminish a short taper plug can be driven into end of pin & rivet over notch plate & plug. [By bottom right sketch] studs plate to keep end plates straight & stated spring as wide as possible. thin washer each side of the spring, these could be flanged bushes in the holes so as not to be loose parts, & so side plates can be very thin. ie between .025 & .040. | ||