Actuating device for an electrical power wrench

摘要

An actuating device for an electrical power wrench includes a base member connected to a motor and an output shaft is rotatably connected to the base member. A pin biased by a spring movably extends through the base member. Two blocks extend from a side of the base member and located in opposite to the output shaft. A movable frame with a weight movably retained between the two blocks and two springs connected between the two ends of the movable frame and the two blocks. An L-shaped actuating member is rotatably connected between the two blocks and connected to two lugs of the movable frame so that when the base member is rotated by the motor, the movable frame radially moves due to the eccentric force so as to pivot the actuating member. The pivotal movement of the actuating member pushes the pin to extend from the other side of the base member to impact a plate extending radially outward from the output shaft. The output shaft outputs sudden and large torque.