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 to The Packless Gland Co. discussing issues with sticking bellows and proposing new interchangeable designs with specific compression requirements.
| Identifier | ExFiles\Box 151\2\ scan0225 | |
| Date | 6th April 1934 | |
| X4695 Exptl. Dept. Hs {Lord Ernest Hives - Chair} /Les.S/KW. 6th April, 1934. The Packless Gland Co., Windmill Road, Sunbury, Middlesex. Dear Martin-Hurst, We want to try dispensing with the Guide Fan for the Bellows F.85395, as we have had occasions when the guide has been sticking in the aluminium cover. We have also been considering how you could give us bellows which would be interchangeable; namely, have the same initial length, but maintaining the feature that the solid length of the bellows acts as the stop for the compressed position. We enclose N.Sch.4025, which shows a way which appears to make this possible. The end pieces are attached to the bellows which is then compressed to solid. The free length is then adjusted by a screwed piece to the exact length required on our drawing, and sweated up by you. So that we should state on our drawing that when the bellows has been compressed to solid it will return to within .005" of certain length. We should also state that the bellows must be compressed at least .125". N.Sch.4025 shows the No. 8 bellows and the No. 4 bellows. With the No. 4 bellows it appears to be rather difficult to sweat the adjustable screwed centre without disturbing the sweated joint to the bellows. | ||