Abstract: To detect a low load of an outrigger with high accuracy and improve alarming accuracy of a roll-over alarming device, the roll-over alarming device for a crane includes a load cell 1 having a coil spring 5 provided with a strain gauge 4, and an upper load cell case 6 and a lower load cell case 7 which support the coil spring 5 from its top and bottom to transfer a load of an outrigger to the coil spring 5, supports 8, 9 for supporting a load when the load having more than a predetermined value acts to restrain yielding of the coil spring 5 being provided between the upper load cell case 6 and the lower load cell case 7, and an alarming section which issues a roll-over alarm on the basis of a load detecting value of the outrigger from the load cell 1.

Abstract: To detect a low load of an outrigger with high accuracy and improve alarming accuracy of a roll-over alarming device, the roll-over alarming device for a crane includes a load cell 1 having a coil spring 5 provided with a strain gauge 4, and an upper load cell case 6 and a lower load cell case 7 which support the coil spring 5 from its top and bottom to transfer a load of an outrigger to the coil spring 5, supports 8, 9 for supporting a load when the load having more than a predetermined value acts to restrain yielding of the coil spring 5 being provided between the upper load cell case 6 and the lower load cell case 7, and an alarming section which issues a roll-over alarm on the basis of a load detecting value of the outrigger from the load cell 1.