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).
Proposal for a new servo brake system designed to overcome objections evident in existing schemes.
| Identifier | ExFiles\Box 73\1\ scan0116 | |
| Date | 27th February 1924 | |
| x9210 Brakes R.{Sir Henry Royce} BY1-P27.2.24. RE SERVO BRAKE SYSTEMS. At home the other evening as a matter of interest I set out to try and overcome certain objections which seemed to me to be evident in most servo schemes, and as a result I am putting forward a scheme which is clear of all existing patents and appears to have some advantages over present systems and is therefore worth considering. As the present foot brake considered as a direct operating system is reasonably good and efficient, being capable of holding the car on any hill and quick enough in operation to give reliable shunting facilities, I accepted this as a sound enough basis to rely upon to hold a car stationary on a hill and to prevent it running backwards, providing the foot pedal energy were concentrated and not dissipated by parting with some of its energy to a servo system which was not available under the conditions in question. The next step demanded a design of servo mechanism which would be effaced when the car was standing or running backwards, but would in turn efface the direct foot operation when the car was moving forward, in other words, when the car is standing no power goes to the servo at all, but when the car is moving all the braking is by servo. The following scheme realizes fully the above conditions. contd. | ||