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 Small & Parkes Ltd. discussing the merits of using cork inserts in clutch discs.
| Identifier | ExFiles\Box 141\3\ scan0273 | |
| Date | 11th June 1934 | |
| ESTABLISHED 1881. CONTRACTORS TO H.M. GOVERNMENT INDIA OFFICE &C. X3409? TRADE MARK Don FRICTION FABRICS TELEGRAMS: "PACKLESS" MANCHESTER. "KARROKO" CENT. LONDON. Codes {A.B.C. 5TH & 6TH Editions. {BENTLEYS, WESTERN UNION. SMALL & PARKES LTD. MANUFACTURERS OF "DON" BRAKE AND CLUTCH LININGS ASBESTOS METALLIC AND FIBRE. TELEPHONES: COLLYHURST 2511 (5 LINES) MANCHESTER. CITY 0412 LONDON. LONDON OFFICE 97D QUEEN VICTORIA STREET, LONDON, E.C.4. HEAD OFFICE: HENDHAM VALE WORKS, MANCHESTER 9 11th June, 1934 Messrs. Rolls-Royce Ltd., Exptl. Dept., D E R B Y. OUR REF. AK/AEI. YOUR REF. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}11/KW. DEPÔTS BELFAST 3, ALFRED STREET. TEL. 5103 BIRMINGHAM 107, LANCASTER ST.{Capt. P. R. Strong}, TEL. 1447 ASTON CROSS. BRISTOL 45, FROGMORE ST.{Capt. P. R. Strong}, TEL. 22986. CARDIFF 121, QUEEN ST.{Capt. P. R. Strong}, TEL. 2326. CARLISLE 31, JOHN ST.{Capt. P. R. Strong}, CALDEWGATE. TEL. 589. CHESTER 66, BRIDGE ST.{Capt. P. R. Strong}, TEL. 1280. CORK 20, WINTHROP ST.{Capt. P. R. Strong}, TEL. 1390. DUBLIN 84, MIDDLE ABBEY ST.{Capt. P. R. Strong}, TEL. 44046. EXETER CHICHESTER MEWS, TEL. 4330. GLASGOW 8, DIXON ST.{Capt. P. R. Strong}, TEL. 5000 CEN. LEEDS 169A, BRIGGATE, TEL. 26042. LIMERICK 28, GLENTWORTH ST.{Capt. P. R. Strong}, TEL. 345. NEWCASTLE-ON-TYNE 30, PRUDHOE ST.{Capt. P. R. Strong}, TEL. 27142. NOTTINGHAM 20, ST.{Capt. P. R. Strong} JAMES ST.{Capt. P. R. Strong}, TEL. 43646. SOUTHAMPTON 69, STAFFORD ROAD, TEL. 3076. SWANSEA 9, WALTER ROAD, TEL. 4536. Dear Sirs, We beg to acknowledge and thank you for your favour of the 8th inst., instructing us to put in hand one "Don-Flex" Clutch Disc to our Blue Print L.690, which was returned. We have noted that you require the overall thickness of the centre portion, not to exceed .125". As requested we are pleased to give you our views regarding the merits of the cork inserts and we would explain that the corks are cut flush with the surface of the fabric and the corks remain in this condition throughout the life of the disc. 1. The corks ensure a flexible attachment of the fabric to the steel plates allowing the latter a certain degree of movement as they accommodate themselves to the mating surfaces. 2. The friction value is enhanced by the corks without impairing the smoothness of engagement and the spring pressure may be calculated to the value of .3 instead of the usual .25 co-efficient of friction. 3. The corks being flush with the surface obviate the need for recesses to collect dust and abrasive matter, as with metal rivets. cont'd.{John DeLooze - Company Secretary} | ||