Shabbos 6:8-9

Shabbos 6:8

A person missing a leg may go out on Shabbos with his prosthetic according to Rabbi Meir bur Rabbi Yosi does not permit it. If the prosthetic is concave to hold cushioning pads, the prosthetic is susceptible to ritual uncleanliness and he may go out with it on Shabbos, as well as enter the Temple courtyard with it. If a person is missing both legs, his chair and his supports are susceptible to the ritual uncleanliness of things made to support one’s weight (midras), and he may not go out with them on Shabbos or enter the Temple courtyard with them. A clown’s implements for entertainment purposes are not susceptible to ritual uncleanliness (because they are not considered vessels) and he may not go out with them on Shabbos (because they are unnecessary).

Shabbos 6:9

A son mourning his father may go out on Shabbos with the father’s shoelace tied to his own (apparently a coping custom) and the sons of kings may go out with bells sewn into their garments. Actually, anyone can do this but it was customary of the sons of kings, so that’s how the Sages framed it.