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).
Spring plate modifications, clips, and reasons for breakages, with suggestions for improvements.
| Identifier | ExFiles\Box 80\2\ scan0139 | |
| Date | 30th April 1920 | |
| (3). DA{Bernard Day - Chassis Design}3/CB30-4-20 contd. two bolts instead of one stud. Our objection to this is that it weakens the plate, but we suggest that this might be remedied by adding a little metal to the plate at that point, in the manner shewn, and that if this is done it is quite a feasible type of clip. (3). We suggest a clip in which the end of one of the plates is rolled round to form an eye, and the clip is steadied from swivelling about this bolt by means of two plates which make it nearly fit the depth of the spring, but we do not like this clip as we think it can never be made very tight. In fact it appears to us that it is only possible to locate the clip off one plate very much in the way it is shewn now, except to make the fixings better. Because the plates twist we think that the clip ought not to fit them very tightly sideways, or if it does, the sides of the plates ought to be cylindrical. We think that the reason why the plates break in the nibs and slots is because there is torsion in the plate as well as bending, and that the torsion is a maximum in the slot, while at the same time the bending due to the deflection of the spring is also a maximum there. It appears that these springs can only come at about the 2000th chassis. In view of Mr Woodhead's remarks we think there will be no difficulty in so modifying the present springs as to make them quite usable. Contd. R R 235 A (100 T) (S.P. 846) I.L. 5.11 V.U.E. H.H | ||