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).
On an experimental alteration to the 40/50 HP foot brake design regarding the locking pin and use of eccentric pins.
Identifier | ExFiles\Box 12\5\ 05-page225 | |
Date | 12th November 1930 | |
RECEIVED 1930 NOV 12 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} ~~Or BY/FWD~~ X7360 BY2/G.12.11.30. X7360. X7420. 40/50 HP. BRAKES. At the time the design of the foot brake was altered to enable us to use Ferodo .375" thick, you will remember that we pointed out that so far as the adjustment of the brake was concerned we had to take the locking pin out of the toggle, which made it possible for anyone to unintelligently continue to use the brakes until the copper rivets would touch the drum. To avoid this we issued experimentally only, a scheme with eccentric pins which would have enabled us to pin the toggle adjusting screw as we have always done; then by turning the eccentric pin when wear had taken place to a certain extent, the full life of the brake was made available without touching the locking pin in the toggle screw, thus maintaining the foolproof advantages of the original design. I am writing this memo to make it clear that this alteration is not instructed on production, and the first 100 R.H. and the first 75 L.H. chassis have no locking pin in the toggle. The above experiment has been instructed only for the 40/50 HP. chassis, but obviously would be made to apply to both 20 HP. and 40/50 HP. if it was passed as satisfactory. BY.{R.W. Bailey - Chief Engineer} By | ||