A shaft passer refers to a wheel that can rotate even if a shaft is held between spokes; the image in the wiki page shows one. The device used in mines is some

A shaft passer refers to a wheel that can rotate even if a shaft is held between spokes; the image in the wiki page shows one. The device used in mines is somewhat similar in that it seems to allow solid objects to pass through each other, but it is not a shaft passer as it is not a wheel with "penetrable" spokes.