Actuating device for an electrical power wrench

An actuating device for an electrical power wrench, comprising:

• a base member having a tubular member extending from centrally a first side of said base member and said tubular member adapted to be connected to a motor, a passage defined through said base member and two blocks extending from said first side of said base member, a side recess defined in said base member and communicating with said passage, a ball received in said side recess and biased by a spring;
• a movable frame movably connected to said first side of said base member, a weight connected to a first end of said movable frame and two lugs extending from said movable frame, two springs respectively connected between said blocks and said movable frame, a guide plate connected to said first side of said base member and guiding said two lugs;
• an actuating member having a first part engaged with said two lugs of said movable frame, and a second part of said actuating member extending from said first part at an angle relative to said first part, said actuating member pivotally connected between said two blocks;
• a pin movably inserted in said passage and biased by a spring mounted to said pin, a groove defined in an outside of said pin, said ball in said side recess being engaged with said groove of said pin;
• an output shaft rotatably and centrally connected to said second side of said base member, a plate extending radially outward from said output shaft, said movable frame moving radially relative to said tubular member due to a rotation of said base member, and said actuating member pivoted and said pin pushed by said second part to extend from said second side of said base member to impact said plate.