US Patent 11185992 Drive mechanism and service robot having the same

A service robot includes a robot body, a main post vertically mounted on the robot body, and at least one service unit provided on the main post to be movable vertically and to be rotatable, and including a service tool. The service unit includes a main plate that is disposed in an inner space of the main post, and a mounting member that is provided to be rotatable along an outer circumferential surface of the main post, and coupled to the main plate. The service tool is mounted on the mounting member, a vertical driving device is disposed in the inner space of the main post to move the main plate vertically, and a rotation driving device is installed on the main plate to rotate the mounting member.