Luffing crane featuring tipping over balance

摘要

A luffing crane which includes a luffing jib pivotable about a pivot axis in a front side of the crane and a tip-over balance that includes at least a movable counterweight. The movable counterweight is configured to move toward the front side of the crane when the jib pivots upwards toward a stalling posture, and further configured to move away from the front side of the crane when the jib pivots downwards to assume a forwardly headed horizontal position, so as to prevent the crane from tipping over when operating. The movable counterweight may move beyond the jib pivot axis such that when the luffing jib is nearing or at complete stall, the movable counterweight is positioned to the front of the jib pivot axis. The tip-over balance may further include a static counterweight located to the rear of the jib pivot axis, to provide further stabilization.