Patent ID: 9061867
Filing Date: 2015-06-23
Classification: B66C

Abstract:
1. A method of controlling unwanted movements of a load suspended by at least two branch hoisting lines ( 30 , 32 ) connected to a hook ( 36 ) provided at an end of a main hoisting line ( 14 ) of a crane, the method comprising the steps of providing a device having a main arm ( 22 ) rotatably mounted to a horizontal derrick ( 12 ) of the crane and displaceable from a folded parked position in which the main arm ( 22 ) extends substantially horizontally and is integrated in the derrick ( 12 ), to an unfolded approximately vertical active position, the main arm ( 22 ) having branch arms ( 28 , 29 ) rotatably mounted at the end of the main arm and unfoldable from a folded position in which they extend substantially parallel to the main arm ( 22 ), to an active position in which the branch arms ( 28 , 29 ) bear against branch hoisting lines ( 30 , 32 ); unfolding the main arm ( 22 ) downwardly into an approximately vertical position, with the branch arms being unfolded to form, together with the main arm a T-shape profile; and further rotating the main arm ( 22 ) until the branch arms ( 28 , 29 ) bear against the branch hoisting lines ( 30 , 32 ) with a force to stop the unwanted movements of the load.