Janney semi-automatic railway coupler - GIF and patent
Railway coupler; I believe this is a semi-automatic Janney coupler.
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Janney had patents for multiple couplings; here's one from 1881: https://www.google.com/patents/US251594.
https://s3-us-west-1.amazonaws.com/h...ing_patent.jpg
Explanation:
https://s3-us-west-1.amazonaws.com/h...xplanation.jpg
Previously:
https://www.homemadetools.net/forum/...hine-gif-51502
https://www.homemadetools.net/forum/...chniques-51740
https://www.homemadetools.net/forum/...rail-gif-62459
More: https://en.wikipedia.org/wiki/Janney_coupler