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 New-Hudson Ltd. regarding a hydraulic unit, materials, and patents for brake wedges.
| Identifier | ExFiles\Box 121\1\ scan0088 | |
| Date | 9th December 1938 | |
| 1029. Experimental Dept. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}5/MH.{M. Huckerby} 9th. December 1938. New-Hudson Ltd., Icknield Street, BIRMINGHAM, 18. For the attention of Mr. Fraser. Dear Sirs, With reference to your telephone call. The hydraulic unit PD.264 has been made to float, the inner machined ring is for the purpose of assisting machining the face, and the outer ring takes a rubber to act as a water seal. This rubber presses lightly against the dust shield. The question of rusting we shall tackle as the problem arises, hard steel on Cast Iron is a good bearing combination and may be satisfactory. Your suggestion of an aluminium bronze stamping is certainly interesting. The hydraulic parts are Lockheed, the unit has to be packed with their special vegetable 'Keenoh' grease. We have been informed by Bendix Ltd. that they have a patent on all hydraulically operated wedges. We have gone into the matter and believe they are incorrect, since the first wedge so operated was patented in 1924 and the patent is now void. We are awaiting a reply to our letter from Bendix Ltd. The wedge unit is, of course, the ordinary Girling wedge. Your two leading shoe brake is very neat and we might try it one day in one of our brakes. The change seems fairly simple. Yours faithfully, for ROLLS-ROYCE LTD. | ||