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 and diagrams for a bonnet locking mechanism, discussing the barrel, pinion, and locking plate.
| Identifier | WestWitteringFiles\Q\January1927-March1927\ 7 | |
| Date | 1st February 1927 guessed | |
| (2) As the length of the barrel is not limited because part can be inside and part outside, it should be easy to arrange. The barrel is shewn going in from the front, held in by pinion, fixed by 2 screws, (high tensile steel screws because so small). Tapping depth should be moderate - 2 to 3 diameters. Bosch uses a countersunk even deeper angle than ours (with advantage). The lock body casting goes in from back (inside of bonnet). It can have smooth surface for stop plate to slide upon, projection on pinion can pass into stop plate - Fig. 2. [Diagram Annotations] Lock barrel. Projection on pinion, better double. I should prefer this detail, also a ring within locking tooth (single) secured to lock plate by two screws which would permit of adjustment. This stop plate turns with the barrel between pinion & body of lock. It is loose so as to permit of complete revolution, and a stop of same dimensions. Adjust these faces or elsewhere to allow barrel to turn and register exactly with locking pins. A scheme of locking would be to have lips on the bonnet that pass under the pads, so that you cannot lift the bonnet up without pulling it out. When the bonnet is locked one cannot pull it out because of No.1. device, also shewn in fig. 1. Fig.3. [Diagram Annotation] This packing can be varied. In designing the details I think face control if possible is better, otherwise pin has to be strong cantilever. Clearances should be arranged where-ever possible without decreasing the efficiency, and these should be ample. | ||