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).
Functional description for an Automatic Strangler, model DC-42.
| Identifier | ExFiles\Box 122\3\ scan0003 | |
| Date | 26th April 1938 | |
| THE ZENITH CARBURETTER CO. Limited. Sheet No... STAMP: THE ZENITH CARBURETTER CO. LTD. ISSUED FROM 26 APR 1938 DRAWING OFFICE STANMORE, MIDDX AUTOMATIC STRANGLER - DC-42 Drawing No. EX-860. Flap "A" (special 90º) must be free to turn through 180º, but with minimum clearance. Lever "B" is a standard lever rivetted to spindle so that when flap is vertical (full open), lever is horizontal. Lever "B" is held by spring C against lever "D" and follows D's movements. Lever "D" is secured to a bush which floats on a pivot rivetted into the bracket, and is pulled in an anti-clockwise direction by spring "E". Control lever "F" is secured to a bush and floats on the same pivot as "D", and is pulled in an anti-clockwise direction by spring "G". Bracket "H" is the same as the standard bracket, but with end extended to form stops for lever "F". -------------- When lever "F" is moved to the closed position it pushes lever "D" through 36º. Lever "B" follows "D" and the flap is then horizontal (closed). Depression on the engine-side of carburetter will cause flap to open anti-clockwise against spring "C". Back pressure from the engine will cause flap to open in a clockwise direction, lever "B" pulling lever "D" against spring "E". -------------- | ||