Dust disposal attachment for a rotary element of a power tool

A dust control attachment for a saw having a housing and a rotary blade secured for rotation on a shaft comprising:

• a blade guard secured on one side to said housing and forming a dust confining channel about a portion of the periphery of said rotary blade and also forming a dust confining cavity within which said blade rotates, an impeller coupled to said shaft and located outside of said dust confining cavity, an enclosing structure mounted to said housing to form an impeller cavity and to enclose said impeller within said impeller cavity and defining a dust transfer passageway from said dust confining channel to said impeller cavity and further defining a dust discharge outlet from said impeller cavity.

An attachment for a power tool having a disk-shaped rotatable element mounted relative to a housing for rotation on a rotary shaft having an axis and extending from said housing comprising:

• a guard secured too said housing and having an edge and opposite sides forming an arcuate channel about a portion of the periphery of said rotatable element and defining a dust passage opening to said channel and including a dust barrier plate on a side of said guard remote from said housing wherein said dust barrier plate defines a shaft opening aligned with said shaft axis, an impeller axially coupled to said rotary shaft remote from said housing, and a bonnet secured relative said housing to confine said impeller therewithin and defining a dust passage from said dust passage opening in said guard to the axial center of said impeller and defining a dust discharge outlet tangentially aligned with the periphery of said impeller.