US Patent 11452226 Robot with through-hole to receive pin

A robot comprises: an outer body in which a pin through-hole is formed; a cover from which a pin passing through the pin through-hole protrudes and in which a protrusion is formed at one side of the pin; and a stopper disposed at an outer circumference of the pin, wherein the stopper comprises: a protrusion contact surface on which the protrusion is contacted and caught; and an outer body contact surface that is contacted and caught by a periphery of the pin through-hole in the outer body.