| 摘要 |
PURPOSE: A grapple is provided to prevent arbitrary rotation of a body with binding force by multiple balls which are installed in a first plate of a bulk and elastically attached to a second plate of the body. CONSTITUTION: A grapple includes a bulk cap and a body. The bulk cap is coupled to a boom. The body is rotatably coupled to the bulk cap and an arm is rotatably coupled to one side of the body. A ball(34) is installed in a coupling part between the bulk cap and the body. The ball is elastically supported by the bulk cap or the body. |
