PURPOSE: To provide a hydraulic wrench that can carry out bolt-nut stening/loosening work suitable for a working robot for power distribution with the same wrench, with no need to be regripped cording to the direction of a working position.
CONSTITUTION: An insulating holder 4 is provided to insert-fit a hydraulic motor 1 into the intermediate part from the base end. One shaft 11 of a transmission gear 9 is connected to the output shaft 3 of the hydraulic motor 1 through an insulating coupling 7, and a cup-like driving shaft 19 is provided at the base end part of the output shaft 17 of a speed reducer 16 connected to the other shaft 12 of the transmission gear 9. The output shaft 17 of the speed reducer 16 is insert-fitted into the driving shaft 19. A one-way clutch 25 is provided between the inner surface of the driving shaft 19 and the base end part of a wrench output shaft 23 with a socket 24 additionally provided at the tip, and a torque limiter 37 is provided at the tip of the driving shaft 19 and the intermediate outer surface of the output shaft 23. A gripper holding piece 43 is provided to rotatably insert-fit the intermediate part of the insulating holder 4 from its base end. The tip part of the insulating holer 4 is formed into a polygonal shape part 41, and an angle positioning piece 46 is provided to insert-fit this polygonal shape part 41 slidably. The mutually facing tip and base end of the respective pieces are provided with engaging pawls 45 and pawls 47.
YOSHIDA KENJI
SASAKI TETSUO
YAMAKAWA MINORU
YAMAMOTO KATSUYA
KINDEN CORP
Next Patent: ROTATING DIRECTION SWITCHING LEVER FOR ROTARY PNEUMATIC TOOL