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).
Letter discussing the principles and details of a new shock absorber design from the Wire Wheel Corp.
| Identifier | ExFiles\Box 28\1\ Scan099 | |
| Date | 18th February 1927 | |
| Oy3-E-21827 February 18, 1927. Mr. Basil Johnson, Rolls-Royce, Ltd., London, England. (Copy for attention of Mr. Royce " " " Mr. Hives " " " Mr. Haldenby " " " Mr. Nadin) Re Shock Absorber Dear Sir: I believe Mr. Royce will be interested in the attached print T-3W of a shock absorber which is being developed by the Wire Wheel Corp. It embodies the principle which has been claimed as a patent by Joseph Hoffmann and about which I wrote some years ago, namely - (1) Movement away from the normal riding position in either direction is free or only slightly restricted. (2) Movement towards the centre from either position, i.e. compressed or extended spring, is opposed equally from either side. Details. (1) The opposition is by orifice only without provision of a valve, except valve C on print, which is an overload blow-off valve coming into action only in case of very rapid movement from the extended spring position upwards. (2) A small free position at the centre is provided of varying lengths as required, by means of the distance between points A and B, i.e. the end of the groove in the vane, and the edge of the half-bore in the cage. (3) The restriction opposing motion towards the centre is provided by an eccentric pin at D adjustable by the dial as shown. | ||