Patent ID: 7703267

Claim:
A blade assembly comprising: a blade having a mounting opening and first and second annular bearing surfaces extending around said mounting opening on first and second sides of said blade, respectively; and a coupler mounted in said opening, said coupler including a shaft, an enlarged head at one end of said shaft, and a journal with a greater transverse dimension than said shaft but smaller transverse dimension than said head, said shaft extending through said mounting opening with said journal located in said mounting opening, and said journal being captured in said mounting opening by said enlarged head, which bears on said first annular surface at said first side of said blade and by a plurality of outwardly extending projections formed at the terminal end of said journal, which project radially outward from said journal and bear on said second annular bearing surface on said second side of said blade to thereby capture the journal in said mounting opening and, further, not permit removal of said coupler from said blade without removal of said projections.