Revolving prevention device null of hanging jig for crane

摘要

PURPOSE: To improve working efficiency and safety by preventing a balance arm type lifting jig from turning and swinging due to the wind in advance. ;CONSTITUTION: A lifting jig 2 is provided with a fulcrum block 3 suspended from the hook 1a of a hook block 1, a lifting arm 5 and a balance arm 6 which are pivoted at the fulcrum block 3 so as to oscillate through a fulcrum pin 4 and are opened and closed in a divider shape to suspend a load to be lifted from the end of the lifting load arm W1 and a balance weight W2 from the end of a balance arm 6. At the end outside of the balance arm 6, there is an anti-rotation device 20. The anti-rotation device is provided with a pressure receiving blade 25 which is arranged so as to be folded in a fan shape, and a driving motor 26 for folding and developing the pressure receiving blade 25.;COPYRIGHT: (C)1993,JPO&Japio