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).
Practical semi-automatic brake adjustment system using a fine ratchet mechanism.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan66 | |
| Date | 1st February 1926 | |
| TO DA.{Bernard Day - Chassis Design} ) FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} } (Le CanadelHenry Royce's French residence.) BY.{R.W. Bailey - Chief Engineer} } C.c. to CJ. BJ. RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} Mr. Claremont. ORIGINAL BRAKES - SEMI-AUTOMATIC ADJUSTMENT. This is more practical than completely automatic. It consists of a fine ratchet device with a given amount of slack to allow the brakes to only come off a pre-determined amount, then the actuating ropes would become loose, suggesting an adjustment which would consist of simply undoing the nut, and without a thought or care the ropes would take up their slack and the nut could be retightened with the brakes correctly adjusted. DA{Bernard Day - Chassis Design}'s dept. (Mr. Hardy) will study a convenient way of arranging this on the back axle, entirely enclosed, and capable of being put back to zero when the repair shop adjustment is made by new liners, or by the screwed connecting rods on the shoes themselves. The failure of this device can do no harm. The pitch of the ratchet must be fine, suggesting 3 staggered pawls, or better, equally spaced pawls, with teeth in ratchet wheel - Z X 3 + 1. Fine face teeth might be tried: they would have very many advantages. Naturally whatever type is found best there will always be the definite angular slack between the wheel and shaft, preferably by teeth at a fairly large radius, say .6 not .25 or .3. | ||