SILENCING MEANS FOR ROTARY CUTTING TOOLS AND PARTICULARLY CIRCULAR SAWS

摘要

ABSTRACT OF THE DISCLOSURENoise output of a rotary cutting tool such as acircular saw blade is substantially reduced by means of a guardwhich wholly encloses the blade when the blade is not cuttingand which comprises fixed and movable imperforate guard members,the movable guard member being movable to expose only the cuttingsegment of the blade. Inner surfaces of the flat side walls ofthe guard have sound absorbing means such as a Helmholtz resonatorarray or a layer of acoustical foam. Modifications of the guardto optimize its silencing effectiveness are disclosed.