Talk:Lever arm shock absorber

This article is written in British English, which has its own spelling conventions (colour, travelled, centre, defence, artefact, analyse) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus.

Automobiles Low‑importance

	Cars portal This article is within the scope of WikiProject Automobiles, a collaborative effort to improve the coverage of automobiles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.AutomobilesWikipedia:WikiProject AutomobilesTemplate:WikiProject AutomobilesAutomobile articles
Low	This article has been rated as Low-importance on the project's importance scale.

Technology

This article is within the scope of WikiProject Technology, a collaborative effort to improve the coverage of technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.TechnologyWikipedia:WikiProject TechnologyTemplate:WikiProject TechnologyTechnology articles

It is requested that an image or photograph of Lever-type shock absorber be included in this article to improve its quality. Please replace this template with a more specific media request template where possible.
The Free Image Search Tool or Openverse Creative Commons Search may be able to locate suitable images on Flickr and other web sites.

Upload

It is requested that an image or photograph of Better photo of the wishbone type. MG B? be included in this article to improve its quality. Please replace this template with a more specific media request template where possible.
The Free Image Search Tool or Openverse Creative Commons Search may be able to locate suitable images on Flickr and other web sites.

Upload

External links modified[edit]

Hello fellow Wikipedians,

I have just modified one external link on Lever arm shock absorber. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20120425161633/http://bhive.tierranet.com/200MGBfrontsuspensionpageone.html to http://bhive.tierranet.com/200MGBfrontsuspensionpageone.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 02:29, 22 December 2017 (UTC)[reply]

De Ram[edit]

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)[reply]

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)[reply]

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)[reply]