Grave device has excavator arm and device, which is attached at arm that presses grave device upward and pre-loading is provided over device, and grave device stands under pre-loading to carry dead weight of grave device of pre-loading

摘要

The grave device has an excavator arm (1) and a device, which is attached at the arm that presses the grave device upward and pre-loading is provided over a device. The grave device stands under a pre-loading to carry the dead weight of the grave device of the pre-loading. The device, which presses the grave device upward, is a spring or a torsion bar.