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).
Redesign of the distribution board and cut-out unit for various chassis models.
| Identifier | ExFiles\Box 166\8\ img008 | |
| Date | 4th November 1931 | |
| X6067 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Wst. c. to Sg.{Arthur F. Sidgreaves - MD} -Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Wst.2/KT.4.11.31. X6067 X6068 DISTRIBUTION BOARD & CUT-OUT. We consider that this unit could be very profitably redesigned for both 20/25 and 40/50 chassis, so that all electric wiring circuits could be distributed from the one board instead of using an auxiliary accessory distribution board as at present on the 40/50 chassis. In order to save distribution fuse space the cut-out could be redesigned also, on the lines of Delco-Remy and Bosch with the two windings on a single core, this unit being mounted straight on the dynamo carcase. Two wires only would then come away from the dynamo. The fuses we recommend for this unit would then be, reading from left to right looking on the board as on the chassis :- (1) Dynamo positive. (2) Dynamo field. (3) Ignition. (4) Offside headlamp. (5) Near side headlamp. (6) Side and tail lamps. (7) Horn and instrument board lamp. (8) Body lights, stop and backing lamps. (9) Starter motor auxiliaries. (10) Spare for cigar lighters, direction indicators etc. (11) Emergency fuse. * Although we have put in a dynamo positive fuse, we feel that there is very little justification for it as in the extremely unlikely event of a short circuit occurring in the wire from the dynamo positive (B) terminal, the emergency fuse would blow before any undue heating occurred in the fairly heavy 90/36 cable. Another point of interest in regard to the fuse units themselves is that a number of makers now make these of cartridge type similar to our dynamo field fuse. These possess advantages over our present standard Bakelite type in that they are easily and quickly replaceable without the use of a screwdriver, assuming that spare refills will be carried clipped inside the cover as at present, also the fuse wire does not so easily oxidize under prolonged heavy load conditions thus increasing the fuse life. On the 20/25 chassis now that electric clocks, stop lamps and other electrical accessories are being fitted it becomes necessary for additional distribution space to be provided with adequate fusing protection whereas on the 40/50 an additional accessory distribution box is fitted. | ||