| 摘要 |
PURPOSE:To prevent the occurrence of a flaw on a screw part and ensure a smooth screw connecting operation respectively by applying light-weight construction to an oscillation part via the use of a single driving part for opening/closing and turning a hand through the changeover of a clutch device, and making the construction of the driving part and the hand monolithic. CONSTITUTION:When the cylinder 34 of a clutch device 33 has been put in a retracted position, the free rotation of a hand retaining part 30 about a driving shaft 23 is locked and the actuation of a driving part 22 causes a hand opening/ closing nut 39 to give a linear motion with a screw shaft 38, thereby opening and closing the finger 43 of a hand 32 and holding a protector 2. And when the nut 39 has been shifted to a screw connecting operation position, a cylinder 34 is extended and the hand retaining part 30 is engaged with the driving shaft 23, thereby actuating the driving part 22 and turning the hand 32 for screw connection. In this case, an oscillating arm 17 is turned into an oscillating condition with the extension of a cylinder device 14, when the screw part of the protector 2 has come to the screw part 1A of a steel pipe 1, and the screw connection is done smoothly. |
