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 notes for various views of a main switch, detailing its components and assembly.
| Identifier | WestWitteringFiles\L\April1924-June1924\ Scan54 | |
| Date | 15th May 1924 guessed | |
| (3) connections are made from the magnet winding of the main switch and the non inductive reistance winding to the magnet frame of the auxiliary switch. View No.5. This gives a section through the base moulding shewing the inserted terminal posts for the auxiliary connections. These inserts are made from square section brass bar the square being used in the design of the upper ends for the connections to the switches to prevent the flag terminals rotating and causing a short. View No.6. This view shews the main switch with its carbon break. The copper brush should be made entirely of working blades with no separators so that the extent to which the brush follows the rocker arm after touching its stop will be reduced to the minimum. The standard carrying the brush is split longitudinally for the purpose of clamping the adjustable stop screw shewn. The contact plate on the rocker arm for the main brush should be riveted and sweated. The rivets are not shewn on the drawing but they should be countersunk and flush on the lower face. The abuttment for the upper carbon clamping plate is made from the same sectioned bar of which the clamping plate itself is manufactured. It should be secured to the carbon rocker arm by riveting and sweating. The rivets are not shewn but should be put in at about the same pitch as the clamping plate screws. Copper lamina are provided for carrying the current from the rocker to the ribbon winding connection. View No.7. When drawing this view it was found necessary to add slightly to the width of the moulded cover and base. All other views should follow accordingly. In designing the cover the sides have been given a slope of 3° and the ends a slope of 1½°. | ||