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).
Description of the operational sequence of a clutch pedal, main clutch, reverse clutch, and band brake.
| Identifier | ExFiles\Box 128\2\ scan0019 | |
| Date | 30th January 1931 guessed | |
| - 4 - sleeve and the forked end of the lever S. makes contact with the enlarged head of the band brake operating spindle V.{VIENNA} The final portion of the clutch pedal movement causes the lever S. to raise the spindle V, thus applying the band brake, the parallel portion of the operating sleeve I. meanwhile passing over the balls J.{Mr Johnson W.M.} without further withdrawing the reverse clutch. On releasing the clutch pedal, the band brake is first freed by the action of the spring X. which as well as freeing the brake,forces the operating sleeve I. to the right (via the lever S. and fork P.) until the balls J.{Mr Johnson W.M.} again enter the conical portion. The final backward travel of the sleeve I. is effected by the springs Y. which slide the abutment collar L. to the right forcing the balls J.{Mr Johnson W.M.} outward and the sleeve I. to the right. It will thus be seen that whenever the clutch pedal is depressed, the following sequence of operations automatically takes place :- 1. Main clutch disengaged. 2. Humfrey-Sandberg reverse clutch disengaged. 3. Band brake applied, and on releasing the clutch pedal, 4. Band brake released. 5. Humfrey-Sandberg reverse clutch engaged. 6. Main clutch engaged. The above sequence of operations gives the fixed wheel drive with easy gear change, and is such that it is impossible either to disengage or engage the reverse clutch under load, other than that imposed by rotating the gears in the gearbox with the main clutch free. | ||