| 摘要 |
PURPOSE:To reduce the quantity of operation of force to a large extent by equalizing the frictions between grasping members, a leading end cylindrical part and a pin to reduce the friction as a whole, in a grasping forceps composed of the grasping members consisting of an odd number of elastic members, by providing a detachment preventing pin so as to widen the tube cavity through which a large number of the grasping members pass. CONSTITUTION:The grasping member detachment preventing pin 7 of grasping members is mounted to the interior of a leading cylindrical part 3 so as to be close to one side in the direction crossing a pipe axis at a right angle. A tube cavity is divided into two sections by the pin 7 thus mounted but one grasping member 4 is passed through the right narrow tube cavity part and two grasping members 4 are passed through the left wide tube cavity part. The position of the pin 7 is shifted from the center of the tube cavity of the leading end cylindrical part 3 to the side permitting the passage of one grasping member 4 and the tube cavity part permitting the passage of two grasping members 4 is made larger than the tube cavity part permitting the passage of one grasping member to almost equalize the friction resistance between the leading end cylindrical part 3 of three respective grasping members 4 and the pin 7 and that between the grasping members. Therefore, the quantity of the operation forces of the grasping members 4 as a whole can be reduced to a large extent. |
