Rotary gang mower

Claim 1

IN A GANG MOWER OF THE CHARACTER SET FORTH, A PLURALITY OF HORIZONTALLY EXTENDING MOWER UNITS DISPOSED END TO END ALONG A SUBSTANTIALLY STRAIGHT LINE, EACH OF SAID UNITS HAVING AN ELONGATED FRAME COMPRISING A PAIR OF UPRIGHT END PLATES DISPOSED IN PARALLEL SPACED RELATION AND HORIZONTALLY EXTENDING CONNECTING MEMBERS RIGIDLY UNITING THE END PLATES AT THE TOP AND REAR PORTIONS OF THE LATTER, GROUND ENGAGING WHEELS JOURNALLED ON SAID END PLATES OF EACH PAIR TO SUPPORT THE REAR PORTIONS OF SAID FRAMES, GROUND ENGAGING RUNNERS MOUNTED ON SAID END PLATES OF EACH PAIR TO SUPPORT THE FRONT PORTIONS OF SAID FRAMES, A ROTARY SHAFT EXTENDING LONGITUDINALLY THROUGH EACH FRAME AND JOURNALLED IN THE INTERMEDIATE PORTIONS OF THE RESPECTIVE END PLATES, A PLURALITY OF LONGITUDINALLY SPACED ANNULAR SERIES OF CIRCUMFERENTIALLY SPACED CUTTER BLADES CARRIED BY EACH OF SAID SHAFTS AND ROTATABLE THEREWITH IN SUBSTANTIALLY VERTICAL PLANES, MEANS PIVOTALLY CONNECTING SAID FRAMES FOR VERTICAL MOVEMENT OF ONE FRAME RELATIVE TO THE OTHER, SAID MEANS COMPRISING PAIRS OF LATERALLY SPACED UPRIGHT CONNECTING PLATES PROJECTING FROM THE OPPOSED END PLATES OF ADJOINING FRAMES, THE CONNECTING PLATES OF EACH PAIR BEING DISPOSED ON OPPOSITE SIDES OF VERTICAL PLANES PASSING THROUGH THE AXES OF SAID SHAFTS. FOR CONNECTING PLATES ON OPPOSED END PLATES OF ADJOINING FRAMES BEING DISPOSED IN OVERLAPPING RELATION AND AXIALLY ALINED PIVOTS CONNECTING THE OVERLAPPED PORTIONS OF THE RESPECTIVE CONNECTING PLATES, AND MEANS FOR DRIVING SAID SHAFTS.