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).
Letter from Gordon Armstrong Patent Suspension discussing a fault with shock absorbers and proposing a solution.
| Identifier | ExFiles\Box 152\1\ scan0266 | |
| Date | 22th March 1937 | |
| TELEPHONE: BEVERLEY 321 GRAMS: ARMSTRONG'S SUSPENSION. The Gordon Armstrong Patent Suspension COMPANY LIMITED WALTHAM WORKS, OPPOSITE ST.{Capt. P. R. Strong} MARY'S CHURCH, BEVERLEY E.{Mr Elliott - Chief Engineer} YORKS GORDON ARMSTRONG. A.M.I.A.E., F Inst. PAT. N. O.{Mr Oldham} TILL. OUR REF: GA.WC.4. YOUR REF: Messrs. Rolls-Royce Ltd., DERBY. 22nd March, 1937. For Mr.Leslie's attention. Dear Mr. Leslie, I understand from Mr. Bogg that you have a pair of our shock absorbers fixed up with your own valve and bellows, and that they do not work. I can now see why it is impossible for these to give correct and, in fact, any working. We have gone into this matter once again for you, knowing that you are anxious to use the bellows control for the time being, at any rate, and I think the following scheme might get over the difficulty. You will see that the lower portion of the valve gear is extended and screwed inside with a quick thread, and outside with a slow thread. There would be a brass nut into which this valve portion screws, its slow-threaded part held by the four existing studs against the casing. The bellows spindle would be made with a quick thread which would not turn, but on moving upwards would naturally give a turning movement to the valve in an upward direction. The bellows that you use are, I understand, capable of about 5/16" movement and you will see by this arrangement that we can utilise the full movement of the bellows and get an easy turning action on the valve itself, which valve portion would only get about 1/16" movement. This movement I believe is sufficient. So far as one can see it would be irreversible and therefore unaffected by an excessive pressure that might take place in the cylinders. When you have had a look at this we would be glad if you would let us know whether you see any catch in it. cont'd.{John DeLooze - Company Secretary} | ||