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).
Load calculations for lever bolts and their fitting in relation to braking forces.
| Identifier | ExFiles\Box 15\5\ Scan317 | |
| Date | 3rd June 1932 | |
| (2) E.5/HP.3.6.32. ---------- to angular pull or for friction of operation. This gives 195 lbs for the average load obtained with the .25 bolt normal fitting of lever and 230 lbs for the .312 bolt. The former may be considered reasonably safe as it is usually computed that for braking purposes a man can exert a sudden pull of 90 lbs and a continuous pull of 50. Regarding the location of the lever sideways, the shops are of the opinion that the biting in bolt will be quite satisfactory for this purpose. Attention is drawn to the variation of the load with respect to the fit of the lever on the shaft. E.{Mr Elliott - Chief Engineer} | ||