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).
Technical discussion on the design and possibilities of a servo-assisted and foot-operated braking system.
| Identifier | ExFiles\Box 73\1\ scan0119 | |
| Date | 27th February 1924 | |
| BY1-P27.2.24. contd. - 4 - takes up the brake pull on the servo driven members cable; giving a brake all foot operated under the first conditions and a purely servo operated brake under the second conditions. It seems to me the scheme has real possibilities and I thought it might interest you, as it avoids present patents in our competitors hands and gives us better and clearer modes of action, or at least as good as theirs. The system avoids ratchets and free wheels entirely and gives either a fully foot operated brake as a fully servo applied brake. The foot brake and apply all four brakes similar to servo by coupling both brakes to the levers on same equaliser or the foot brake could operate only on the rear as at present with servo on separate equaliser covering all four drums. It is noteworthy also that the foot brake operation suspended during the motion of the car forwards is always there ready as an emergency brake to pick up the load and apply it if the servo clutch for any reason fails. I think a cone clutch has most possibilities in developing the system with its cone angle fixed in relation to the two sets of spiral keys, i.e. those in lever coupled to the foot pedal and those in the driving member of the clutch. BY.{R.W. Bailey - Chief Engineer} | ||