PURPOSE: To generate appropriate frictional force and tractive force between a grip and a rope by using reaction obtained from the third track for the positional movement of a middle pin on a link mechanism constructed by two or more arms with pins on both ends to put the moving side grip in press contact with the fixed side grip via a rope at the middle.

CONSTITUTION: A spring push plate 10 is connected to another pin on the second arm 14 so that the second arm 14 as well as the spring push plate 10 can move straight to the direction of a fixed grip around the pin. With the movement of a vehicle or equipment, the third track 6a inserted under a roller 15 lifts up the roller 15 and thereby a moving side grip moves to the direction of the fixed side grip 8, contacts a rope 4 and then obtains sufficient gripping force and tractive force by a rope gripping dish spring 12 compressed by reaction from the third track.