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).
The principle of a spring-loaded ball valve lubricator with a bayonet joint for a grease gun.
| Identifier | ExFiles\Box 76\4\ scan0249 | |
| Date | 1st June 1920 | |
| Contd. -2- the firm's Hupmobile, both of which work satisfactorily and are vastly preferable to the ordinary grease cup, because of accessibility. The principle of the lubricator is a little spring loaded ball valve screwed to the shackle bolt and depressed by the nozzle of the grease-gun thus:- [Handwritten annotations on diagram] Bayonet Joint. Hose from grease gun! Strong Spring. Cup leather Seal Taper fit to prevent grease leaking Weaker Spring The screw-down grease-gun forces grease# into the bearings under as much as 450 lbs. pressure, as shown by gauge with [strikethrough] leakage at the joint. Instead of having to crawl about under the car to find and load grease cups, it is only necessary to feel for the lubricator, wipe it with an oily rag to get rid of dirt( otherwise the joint leaks) and click on the junction (Contd.) | ||