Sound attenuating rock drill shank

Rock drill comprising an axially elongated drill shank, a boring head at one end of said drill shank, a helix extending around and in the axial direction of said shank for carrying borings away from said boring head, said helix spaced radially outwardly from said shank, an axially extending tubular shell coextensive for the axial length thereof with said drill shank and located between said shank and said helix, means formed of a highly polymerized material for spacing said tubular shell radially outwardly from said drill shank, said helix is supported on said tubular shell, wherein the improvement comprises means located between said helix and said drill shank for providing a sound-attenuating effect and said sound-attenuating means comprises first a support element, located between and in contact with said helix and said tubular shell and serving both as a support for said helix and as a barrier preventing the transmission of vibrations between said helix and said tubular shell.