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).
Manufacturing rights and operation of a special foot pump for low-pressure tyres.
| Identifier | ExFiles\Box 149\5\ scan0054 | |
| Date | 20th May 1925 | |
| Hs.{Lord Ernest Hives - Chair} from ROY.{Sir Henry Royce} ------------ ROY{Sir Henry Royce}14/MG20.5.25. You will recollect Mr. MacBeth, late of the Dunlop Company, designed a special Foot Pump for Low Pressure Tyres. The manufacturing rights thereof have now been taken over by the Yote Manufacturing Company, of Sutton Coldfield. I do not think the sample they have sent will interest us at the moment, but I am passing it to you herewith. Please return in due course. The makers say:- "To operate: the steady plate should be opened out "at right angles to the base of the pump, and the hooks "holding the two pistons down, released; you then stand on "the pump with one foot on each piston, holding the side "of the car. "With this pump, you will find the inflation of a "balloon tyre far quicker and less fatiguing than with the "ordinary lever or toggle action single cylinder foot pump. "The whole pump is well designed, the steel cylinders "being laid in the mould and the cast brass base cast on to "them. The parts are all made to limits and interchangeable. "The valve connection is also patented; it is of the "universal push-on type; there is a pin to open the "valve pin, and two valves in the body of the pump to retain "the pressure. This being the case, practically the whole of "the air compressed in the pump is driven past the valves "and is effective in inflating the tyre. In the usual tyre "pump the air between the bottom of the piston and the tyre "valve is compressed, only to expand again when the piston "rises, which means that this type of pump is very "inefficient." They have no sample ready yet of a Pump suitable for High Pressure Tyres. ROY.{Sir Henry Royce} PUMP. to accompany this Memo. | ||