Terrazzo grinding machine

Claim 1

A FLOOR TREATING MACHINE, COMPRISING A FRAME WITH A CONTROL HANDLE CONNECTED THERETO, A SOURCE OF ROTARY POWER ON THE FRAME AND INCLUDING A PAIR OF SIDE-BY-SIDE ROTARY DRIVE MEMBERS JOURNALLED ON THE FRAME ON VERTICAL AXES AND ROTATED IN OPPOSITE DIRECTIONS, A PAIR OF FLEXIBLE COUPLINGS CONNECTED WITH RESPECTIVE DRIVE MEMBERS, A PAIR OF FLOOR-ENGAGING AND TREATING ROTORS ON UPRIGHT AXES IN SUBSTANTIAL ALIGNMENT WITH SAID RESPECTIVE FLEXIBLE COUPLINGS AND DRIVE MEMBERS, EACH OF SAID ROTORS HAVING ROTARY MEANS INCLUDING A RIGID MEMBER CONNECTING SAID FLEXIBLE COUPLING TO SAID ROTOR, SAID RIGID MEMBER HAVING A PERIPHERAL SURFACE CONCENTRIC OF THE ROTOR AND EXTENDING TOWARD THE CENTER OF FLEXING OF SAID COUPLING, BEARING MEANS CONFRONTING EACH OF SAID PERIPHERAL SURFACES OF SAID RIGID MEMBERS FOR APPLYING PRESSURE THEREAGAINST IN A DIRECTION NORMAL TO SAID SURFACE, SUPPORT MEANS ON THE FRAME AND CARRYING SAID BEARING MEANS FOR MOVEMENT TOWARD AND AWAY FROM THE PERIPHERAL SURFACES OF SAID RIGID MEMBERS, WHEREBY TO TILT THE ROTORS AND PRODUCE PROGRESSIVE TRAVEL OF THE MACHINE ALONG THE FLOOR.