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).
Design and function of the Myth hand brake linkage, specifically the rear idler lever and equaliser.
| Identifier | ExFiles\Box 110\1\ scan0030 | |
| Date | 4th January 1941 | |
| 1030 706 To Rm{William Robotham - Chief Engineer}: from Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} Copy to Rm{William Robotham - Chief Engineer}/HH. & Ev.{Ivan Evernden - coachwork} Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}3/ET.4.1.41. MYTH HAND BRAKE LINKAGE. ------------------------- PL.439 attached shows the rear part of the hand brake linkage on Myth, i.e. the rear idler lever and the equaliser on the axle. Since the idler lever has no bending, it is made up from a plate blanking welded to a length of tube. The loads on the idler are vertical only due to the pull of the rod on bump or rebound. All the brake rods are ¼" diameter and this has meant designing new fork ends, as the smallest standard ones are for 5/16" rods. The equaliser pivots about its bottom for equalisation, and this means that clearance must be left between the upper equaliser lever and the fork ends, and that the pins in these fork ends shall work in clearance holes in the lever. The bottom support of the equaliser is a Harris bush requiring no lubrication. The equaliser and idler lever are mounted on "Oilite" bushes, with the idea that no further lubrication will be required after assembly. This drawing also fixes the relationship of the brake back plate bolts with the pinion and axle. EV{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} Original to Rm{William Robotham - Chief Engineer}/HH. Print to Rm{William Robotham - Chief Engineer}/HH., Ev.{Ivan Evernden - coachwork} & Ashby. | ||