A conventional hand-held weed trimmer of the type including a motor with a flexible cutting line fixed to the output of the motor is provided with a carriage for converting the trimmer into a wheel-mounted lawn mower. The lawn mower consists of a wheel-mounted, planar deck having an open interior portion...http://www.google.com/patents/US4756147?utm_source=gb-gplus-sharePatent US4756147 - Weed-trimmer-to-lawn-mower conversion carriage
