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).
Causes of and suggested remedies for difficult-to-operate sliding roofs.
| Identifier | ExFiles\Box 117\3\ scan0260 | |
| Date | 22th January 1941 | |
| To Rm.{William Robotham - Chief Engineer} From Rm{William Robotham - Chief Engineer}/EAG. Copy to Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} 1021 Rm{William Robotham - Chief Engineer}/EAG.9/ET.22.1.41. SLIDING ROOFS. Regarding the trouble we are experiencing through sliding roofs being difficult to operate, we have found that the cause of the trouble is as follows:- 1. Felt in sliding channels has been greased, which has caused it to swell, while dust and grit have collected, causing the channels to bind on the slides. 2. The clearances round the sliding panels are not generous enough to allow for any wear that takes place through the felts bearing on the edges of the slides. 3. Rubber sealing strips on sides of sliding panels are, in some cases, uneven and rub on the sides of the roof opening, and acts as a brake. 4. The wedging action of the sliding panel which engages the underside of the lip at the front of the roof opening sticks, particularly after the roof has been closed for a time. Suggested remedies:- 1. Give slightly more clearance to groove in felts, and lubricate with paraffine wax and graphite. 2. Give sufficient clearance between edges of sliding panel and roof opening to allow for wear of felts; also give a little more clearance between the underside of the sliding roof and the top of the roof opening, so that the cloth does not rub and act as a brake. 3. See that the edges of the rubber are cut straight and not frilled during fixing. 4. With the present type of overlapping front, a certain amount of sticking is bound to be experienced. If a small roller is fixed on the underside, between roof and body, the friction that now exists between the two plates which are | ||