US Patent 7363710 Rotary cutting tool assembly

A tool assembly comprising a primary tool including a housing internally mounting a rotary cutter blade with a portion of the blade exposed for a cutting action, and a cover for selectively protectively enclosing the cutter blade of the primary tool, the cover also including a housing mounting a second rotary blade partially exposed for cutting action upon utilizing the cover housing as a handle, the primary tool housing protectively enclosing the cover blade simultaneously with the cover protectively enclosing the primary tool blade upon engagement of the cover with the primary tool.