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 modifications and specifications for a press-button switch on a steering column.
| Identifier | ExFiles\Box 95\1\ scan0231 | |
| Date | 6th November 1935 guessed | |
| -3- It is intended that it should be possible to withdraw the worm tube from the column through the pressed-in retaining cage. Switch. The switch as drawn is materially to the latest scheme issued by yourself, namely R.R.Sch.882. We have shown 7BA screws for retaining the switch button in position, and have reduced the clearance between the depression containing the switch and the sheet metal pot forming the inner portion of the press button. We give dimensions of this button and clearances which we think will give us the required appearance and still provide a practical job. The load required to depress the button is an all important factor. We believe that the load to depress the button in centre should not be more than one pound, and we would like the spring to have as many coils as possible so that the rating will be at a minimum. Such a spring would give a load of about ½ lb. when the button is depressed at either side for 'loud' and 'soft'. We wish the heads of the button retaining screws to be painted so that they will be as inconspicuous as possible. To guide the wires and to prevent them chafing on the enlarged cylindrical cavity at the top of the steering control tubes we have shown a brass tube sweated into the control cover plate boss. We would like a sample steering column and wheel built up as soon as possible for approval, as it is this design which we wish to be used on production. Ev.{Ivan Evernden - coachwork} Att: LeC.4728. | ||