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I found this switchable coupling in Rollof/Matek machine elements, i have never seen this kind of coupling before.

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According to the dutch edition its name is:

Tweevlakskoppeling

Which literally means Two-surface coupling

After some research on the web i couldn't find any reliable information, i thought the translation is wrong, then I checked the original edition in german, apparently, the name is correct. The original edition:

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Can someone identify this coupling?

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    $\begingroup$ Okay, you have a mechanical fingerplate clutch with a fussy throwout bearing. Why the fussy bearing? It would let you have zero hold-in force against the bearing. I tried for an hour to find one like it and couldn't. $\endgroup$
    – Phil Sweet
    Jun 18, 2019 at 22:34
  • $\begingroup$ @PhilSweet I really appreciate your effort, i guess this is just a concept, and there is yet no commercial prototype exist. $\endgroup$
    – user14407
    Jun 19, 2019 at 8:47
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    $\begingroup$ Either that or they quit making them 50 years ago. I can see one of these being connected to a great big hand lever on an old sawmill drive. $\endgroup$
    – Phil Sweet
    Jun 19, 2019 at 9:29

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Look for overrunning clutch or power transmission elements.

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You may find a lot of info in Ringspann site: Ringspann power transmission section

Or here: Ringspann catalogue

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  • $\begingroup$ I checked the websites thank you, but this seems whole other mechanism, i looked at the catalogue, the coupling (mine) follows the same mechanism as a regular car clutch, the only difference is the locking system number 10 in my sketch, however in your links, this kind of locking system doesn't exist or at least i don't see it. $\endgroup$
    – user14407
    May 19, 2019 at 18:05

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