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).
Description of the mechanism and sequence of operations to obtain a free wheel drive.
| Identifier | ExFiles\Box 128\2\ scan0020 | |
| Date | 30th January 1931 guessed | |
| - 5 - In order to obtain a free wheel drive it is necessary to hold the reverse clutch permanently out of operation which is brought about in the following manner :- A Bowden or other suitable control is attached to a collar I. which can slide in the larger portion of the bore of a hollow plunger 2. but is normally held in the position shown by a comparatively strong spring 3. retained by a plug 4. A comparatively light spring 5. tends to force the plunger 2. to the right. One end of the operating fork R.{Sir Henry Royce} is formed with an extension 6. which during the movement of the fork passes across the end of the plunger 2, the position of which is such that the projection 6. moves clear of it just as the Humfrey-Sandberg reverse clutch is fully disengaged. Assuming that the car is being driven fixed, and it is required to change to free wheel drive, the Bowden control is first released, which allows the spring 5. to push the plunger 2, to the right until its face makes contact with the projection 6. of the operating fork R.{Sir Henry Royce} which checks further movement of the plunger. The clutch pedal is then depressed carrying the operating fork R.{Sir Henry Royce} forward until the projection 6. clears the plunger 2. when the latter will immediately move further to the right getting behind the projection 6. On releasing the clutch pedal the band brake is first released but further backward motion of the operating fork R.{Sir Henry Royce} is prevented by the engagement of the extension 6. with the plunger 2, the reverse clutch being consequently held in the disengaged position although the spindle Q, arm R.{Sir Henry Royce} and lever P. are free to rotate back until the main clutch is fully engaged. The sequence of operations on depressing and | ||