Lawn mower cutting assembly

Claim 1

A grass cutting assembly for a rotary mower having a wheeled housing and a vertical drive shaft extending into the housing, the cutting assembly comprising: (a) a rotor having a circular outer periphery and being adapted to be mounted in a horizontal position on the drive shaft, the rotor having a peripheral portion with an inner face and at least one blade receiving opening extending radially therethrough from the inner face to the outer periphery of the rotor, a narrow portion of the blade receiving opening adjacent the inner face having a rectangular shaped cross-section which is substantially greater in height than width, (b) at least one elongated blade formed of resilient flexible material having a flat mid portion extending between an enlarged inner end portion and a flat outer cutting portion, each blade being replaceably mounted on the rotor by axial insertion outward through a respective one of the blade receiving openings in the peripheral portion, the outer cutting portion being twisted at substantially 90° to the mid portion whereby the blade rotates substantially 90° as it is inserted to a cutting position wherein the enlarged inner end portion abuts against the inner face of the peripheral portion of the rotor and the mid portion extends with a substantially vertical orientation through the respective blade receiving opening to maintain the outer cutting portion which projects outwardly beyond the outer periphery of the rotor in a substantially horizontal orientation.