Patent ID: 7387563

Claim:
A mandrel and accessory combination, comprising: (a) a mandrel assembly including: a shaft component defining an axis and having (i) a first portion configured to be received in a chuck of a power tool, and (ii) a second portion having a first shaft tooth and a second shaft tooth each extending in a perpendicular manner with respect to said axis; and a collar component defining a passage through which said shaft component extends, said collar component having a first collar tooth and a second collar tooth, and (b) an accessory including: an outer wall structure defining a circular outer periphery; an inner wall structure defining a coupling opening, wherein said inner wall structure includes (i) a first inner wall portion defining a first arc of a first circle having a first diameter, (ii) a second inner wall portion defining a second arc of said first circle having said first diameter, (iii) a third inner wall portion defining a third arc of a second circle having a second diameter, and (iv) a fourth inner wall portion defining a fourth arc of said second circle having said second diameter, wherein said first shaft tooth includes a first outer shaft tooth wall portion defining a fifth arc of a third circle having a third diameter, wherein said second shaft tooth includes a second outer shaft tooth wall portion defining a sixth arc of said third circle having said third diameter, wherein said first collar tooth includes a first outer collar tooth wall portion defining a seventh arc of said third circle having said third diameter, wherein said second collar tooth includes a second outer collar tooth wall portion defining an eighth arc of said third circle having said third diameter, wherein said first diameter is greater than said second diameter, wherein said first diameter is greater than said third diameter, and wherein said second diameter is less than said third diameter.