Patent ID: 8069574

Claim:
A rotary cutter for a mower, comprising a cutting head including a main body, the main body having a case, a cover and a sidewall, at least one cord of a predetermined length extending in a radial direction of the cutting head from the cutting head driven for rotation through a drive shaft, at least one fastening means for fixing one end of the cord to the main body, wherein the fastening means includes a pair of ratchets, each ratchet pivoted for turning on the main body and constantly applied with a rotational force in a predetermined direction by a spring, and the cord is clamped and fastened by the ratchets, an inner end portion of the cord inserted from the sidewall of the main body being fastened by the fastening means, and the cord being removed and replaced with a new cord when the cord is worn out, wherein each of said ratchets comprises at least two or more sheets of laminated ratchets, each sheet of said laminated ratchets is coaxially stacked and pivoted so as to turn separately so that said each sheet independently clamps and fastens the cord.