US Patent 7053516 Back cover having carbon brush holder for motor

A back cover for a motor includes a shell body, two carbon brush holders and two covering caps. The shell body has two receiving holes cut through inside and outside walls thereof. The carbon brush holders are respectively mounted in the shell body for holding a respective carbon brush bar in the receiving holes. The two carbon brush holders each have a mounting plate located in one of the receiving holes, and a spring supported on the mounting plate for forcing the carbon brush bar toward an inside of the shell body. The covering caps are respectively mounted on the outside wall of the shell body to cover the receiving holes respectively.