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. Ltd. regarding specifications for a flexible gland spring.
| Identifier | ExFiles\Box 151\2\ scan0145 | |
| Date | 15th January 1934 | |
| X4698 Exptl. Dept. Hs {Lord Ernest Hives - Chair} /Les.1/KW. 15th January, 1934. The Packless Gland Co.Ltd., Windmill Road, Sunbury, Middlesex. Dear Sirs, For the attention of Mr. Martin-Hurst. ------------------------------------- Thank you for your letter dated 11th inst., concerning the flexible gland, Hs. {Lord Ernest Hives - Chair} 1077. With regard to the free length of the spring, this was reduced from 3/8" to 5/16" to suit your requirements. From your list of bellows we thought 3/8" was an exact number of convolutions, but later you informed us that 5/16" was an exact number. In any case it does not matter what the length is, as long as it does not exceed 3/8" in working position. Variations in length can be allowed for by the actual gland thickness. It must be possible for the spring to go choc without harming the bellows, as this is the only method for driving the bush into the casing. The sample you have sent appears to be quite satisfactory. We suggest that you build 5 more similar assemblies, and that the other six should have an extra convolution. In order to increase the choc length of the spring you will have to put a steel ring next to the spring of the thickness of the extra convolution. Our drawing Hs. {Lord Ernest Hives - Chair} 1077 shows the gland in working position. I hope this clears up all the doubtful points. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||