Patent attributes
In a counterweight attaching and detaching apparatus for a crane, the length of a suspension member is adjusted by an extendable member and links because the distance provided between the peak of a gantry and an upper surface of each of weights when the gantry is suspending the weight at a respective mounting position varies depending on the mounting position. In order to complement the adjustment of the length, different amounts of protrusion of rings from the upper surfaces of the weights are set so that the protrusion amount in the forefront weight is the largest and the protrusion amount in the rearmost weight is the smallest. This reduces the number of types of necessary links used in the suspension member to attach and detach the weights, and the number of operations of connecting and removing the links, and improves operation efficiency.
