Mechanical shock-absorbing device

A mechanical shock-absorbing device comprising a metal cylindrical ring, an axis for said ring, an internal diameter for said ring, an external diameter for said ring, a height for said ring along said axis, said internal and external diameters defining the thickness of said cylindrical ring which is the difference between said diameters, said internal and external diameters being constant along said height of said cylindrical ring, said thickness being on the order of one-sixth of said external diameter and a plurality of circular orifices in and over the surface of said cylindrical ring, said circular orifices being so disposed in circles on said ring that there is the same cross-section of metal along each generator line of said cylindrical ring.