US Patent 10022874 Robotic hand

A robotic hand includes a servo housing, a plastic circuit board (PCB), a motor, a planetary gear transmission assembly and a movable plate that are mounted within the servo housing, and a plurality of claws rotatably connected to the servo housing. The motor is electrically connected to the PCB. The planetary gear transmission assembly is connected to an output shaft of the motor. The movable plate is connected to an output shaft of the planetary gear transmission assembly and movable when driven by the planetary gear transmission assembly. One end of each of the claws is pivotally connected to the movable plate and the claws are rotatable toward or away from one another when driven by the movable plate.