Talk:Lever arm shock absorber

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De Ram
I've added a short statement about the origins of the lever/piston type absorber with the De Ram design, based on this source. However, on further reflection I'm a bit uncertain about the proper categorization of De Ram shock absorbers and whether they should be discussed in the Lever arm shock absorber article or the friction disk shock absorber article. They use hydraulic force acting on pistons to modulate the damping strength, which would seem to define them as early lever/piston types. However, these hydraulic pistons in turn place pressure on friction discs, which would make this more of a friction design. There is already a section for the de Ram pattern at the friction disk shock absorber article, however there is no reference to the hydraulic component of this design so I'm not sure if there was a "pure friction" De Ram prior to the hydraulically actuated type or if it's referring to the same thing. Thoughts? Prova MO  (talk)  17:39, 11 October 2022 (UTC)


 * I spent some time further investigating De Ram's patents. I found three patents describing a frictional shock absorber with hydraulic actuation: US1752240A, US1805466A, US2344082A. While these all operate on a similar principle to the shock absorber described in the April 1935 Motor Sport article linked above, the details of their mechanism all differ from each other and from the mechanism described by Motor Sport. There is another patent, US1529878A (currently used as a source in this Wikipedia article) which describes a purely hydraulic design using a piston and valves, with no friction component. This suggests to me that De Ram absorbers could be discussed in both the friction disk shock absorber article and this lever arm shock absorber article. Unfortunately, the only source I have found that both goes into detail about the use and mechanism of De Ram shock absorbers is the Motor Sport article, which exclusively discusses hydraulically-actuated friction shocks. Other than that, I can't find anything that would indicate whether De Ram ever constructed or used "pure hydraulic" types after his patent, or whether De Ram designed/patented, constructed or used "pure friction" types. Some online Bugatti-centric sources mention the De Ram absorbers, but don't go into any detail other than stating they were equipped to certain cars. While the existence of patents seems notable in the context of historical development of the type, any additional sourcing would be excellent to clarify De Ram's contributions. Prova MO   (talk)  16:06, 12 October 2022 (UTC)
 * I decided to remove the Motor Sport article citation and image, I will be incorporating these into the friction disk shock absorber article. As it stands, the only source connecting de Ram with the pure hydraulic lever arm shock absorber is the 1925 patent US1529878A. It would be great to find more sources that explain whether de Ram actually constructed this type or just patented it. Prova MO   (talk)  21:04, 15 October 2022 (UTC)