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 Associated Transmissions Limited regarding a scheme for embodying Humfrey-Sandberg clutches in a constant mesh third gearbox.
| Identifier | ExFiles\Box 128\2\ scan0024 | |
| Date | 6th February 1931 | |
| Telephone: SLOANE 6217, 6218, 6219. Home Telegraphic Address: 'SANDBERG, SOWEST, LONDON' Telegrams from abroad: 'SANDBERG, LONDON' X2200. ASSOCIATED TRANSMISSIONS LIMITED. (PROPRIETORS OF HUMFREY-SANDBERG & GEARLESS TRANSMISSION PATENTS) DIRECTORS: J.{Mr Johnson W.M.} B. E.{Mr Elliott - Chief Engineer} DAHLERUS (SWEDISH) CHAIRMAN. W. N. DUFF, M.I.N.A., A.M.I.C.E. S. R.{Sir Henry Royce} HOGG, F.C.A. J.{Mr Johnson W.M.} C. W. HUMFREY, O.B.E. COL. THE MASTER OF SEMPILL, A.F.C., A.F.R.Ae.S. SECRETARY: E.{Mr Elliott - Chief Engineer} B. ORMSBY, M.I.Mech.E. 40, Grosvenor Gardens, London, S.W.1. 6th February 1931. Messrs. Rolls-Royce Ltd., Derby. For attention of Mr. Hives - Experimental Dept. Dear Sirs, With further reference to the writer's visit to your Works on January 23rd, we have much pleasure in enclosing herewith a scheme for embodying Humfrey-Sandberg Clutches in your constant mesh third gearbox. A description of the scheme is attached to the drawing. It will be noted that the clutches and controls form a complete unit on a double splined sleeve which goes on to the modified secondary shaft. This scheme ensures that all thrusts in the clutches are kept self-contained, and not transmitted to the gearbox casing. The clutches have a torque rating of about 5000 lbs.-ins., and should be quite strong enough to stand up to the duty required. Without a drawing of the whole gearbox, as asked for in our letter of January 30th, we cannot be | ||