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).
The Dewandre braking system and the Dennis worm and nut steering box.
| Identifier | ExFiles\Box 179\1\ img111 | |
| Date | 21th November 1931 guessed | |
| (2) A 3 unit Dewandre system is used on some chassis in which a main unit operates the rear brakes by mechanical means in the usual way, and two smaller units mounted on the front brake anchorages operate the front brakes. These smaller units are coupled to the main control by flexible tubing. To provide the necessary capacity for rapid operation of the brakes a reservoir which is maintained in an exhausted condition by the engine is coupled to the system. Further units are provided for operating the brakes on large trailers. For this work however it is said that the pressure system is preferred as having less operating lag, air at 100 lbs. per sq.in. being used from a reservoir filled by a pump mounted on the engine. Means are provided for reducing the braking effort on the trailer in the unloaded condition. The general tendency of these systems is to secure good equalisation of the retarding effort on all road wheels with powerful and selective braking, but they are dependent on the uninterrupted operation of the engine for their supply of power. STEERING. The Dennis steering box is of a somewhat interesting pattern, having some features in common with our own. It is of the worm and nut type, the nut being in the form of a large cylinder prevented from rotating and sliding in the casing of the box, and having a heavily whitemetalled thread. The lower portion of the nut carries a steel cheese on a transverse axis which engages an arm of circular section bolted to the rocking shaft. | ||