Rotary lawn mower blade mounting structure

Claim 1

A ROTARY LAWN MOWER CUTTER BLADE ASSEMBLY COMPRISING A CARRIER DISC WHICH REVOLVES IN A SUBSTANTIALLY HORIZONTAL PLANE DURING OPERATION OF THE LAWN MOWER, DIAMETRICALLY OPPOSED CUTTER BLADES MOUNTED ON SAID DISC TO TRAVEL THEREWITH AND MAINTAINED RADIALLY EXTENDED FROM SAID DISC DURING ROTATION BY CENTRIFUGAL FORCE, SAID BLADES HAVING KEYHOLE OPENINGS NEAR THEIR INNER ENDS INCLUDING REDUCED WIDTH SLOTS WHICH EXTEND RADIALLY OUTWARDLY DURING ROTATION, STUDS ON SAID DISC ENGAGEABLE THROUGH SAID OPENINGS TO FORM PIVOTAL CONNECTIONS WITH SAID BLADES, AND RETAINING PINS ON SAID STUDS SPACED FROM SAID DISCS AND RECEIVING THE BLADES BETWEEN SAID DISC AND PINS AND EXTENDING SUBSTANTIALLY AT RIGHT ANGLES TO THE STUDS AND PROJECTING RADIALLY INWARDLY THEREOF AND DIAMETRICALLY OPPOSITE TO THE REDUCED WIDTH SLOTS WHILE SAID BLADES ARE HELD RADIALLY EXTENDED BY CENTRIFUGAL FORCE, SAID PINS THEN POSITIVELY RETAINING THE BLADES ON SAID STUDS, THE BLADES BEING READILY DETACHABLE FROM THE STUDS BY TURNING THE BLADES AROUND THE STUDS UNTIL SAID SLOTS OF THE KEYHOLE OPENINGS BECOME ALIGNED WITH SAID PINS.