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).
Design and implementation of built-in jacking systems for cars.
| Identifier | ExFiles\Box 139\2\ scan0113 | |
| Date | 30th July 1934 | |
| 13117 To Eg. and Wer. from E.{Mr Elliott - Chief Engineer} c. Hsl. By.{R.W. Bailey - Chief Engineer} Ox. Dn. Sft.{Mr Swift} Er. Box. De. By/NW.{N. Walker - Patents} RWG Jacking Systems for RR. Cars. There is no doubt that a built in Jacking system is in demand but we know of no scheme on the market which is not open to some serious objection. We do not wish to add unsprung weight to the axles, neither do we like a scheme which may get out of order if left for long periods like the hydraulic. It has occurred to me that in the case of the SpectreCodename for Phantom III we could arrange three simple built in inverted screw jacks fixed on the chassis frame, one under the centre of the front crossmember and one on each rear dumb iron. The two rear ones would be coupled together for simultaneous operation by a cross shaft passing through the rear tubular crossmember and the minimum of effort in raising would be assured by the use of bevel gearing mounted on simple needle roller bearings with ball thrusts for carrying the reaction of the loads so that only the inefficiency of the screw would remain. The rear jacks could be arranged for the operation either from a single point in the centre of the rear of the car by use of the usual jack handle or at either side. The single front jack which would lift the front end of the car would be operated through the centre of the apron. We might be able to arrange for the starting handle to do duty also as the jack handle to reduce the number of tools to be stowed away. In the case of the SpectreCodename for Phantom III front wheel suspension rubber rebound stops are provided as well as bump stops and these automatically pick up the wheels off the ground when the frame is lifted. In the case of the rear wheels we should propose to arrange light rigid steel slings attached to the chassis | ||