AIRCRAFT OF A LAST AND IMPACT A LAST CROWD

摘要

An apparatus for hoisting a load, comprising a hoisting hook or eye to be coupled to a hoisting member, at least two oppositely positioned gripping arms with gripping jaws movable relative to each other, a connection of the hoisting eye via pulling members to the gripping arms for urging the gripping arms towards each other during the hoisting operation, whereby at least one pulling member is coupled to the one end of a first hydraulic piston-cylinder assembly provided with a resilient member for urging the first assembly in the starting position, and furthermore comprising a second hydraulic piston-cylinder assembly mechanically connected to one of the gripping arms and via a hydraulic line to the first hydraulic cylinder, resulting during the hoisting operation in the flow of the oil pressurized in the first cylinder towards the second cylinder and urging the gripping jaws towards each other, at least one non-return valve in the hydraulic line of the first cylinder to the second cylinder and an operable valve means for connection of the second cylinder to an oil collection space.