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Abstract
DISCLOSED IS A SELF-PROPELLED LAWNMOWER FOR CUTTING GRASS IN A COMPLETELY RANDOM AND UNATTENDED MANNER. THE UNIT IS PREFERABLY PROPELLED BY A BATTERY AND COMPRISES A FRAME SUPPORTED ON A PAIR OF FRONT CASTER WHEELS AND A PAIR OF REAR DRIVE WHEELS. THE DRIVE WHEELS ARE COUPLED TO A CONTINUOUSLY ROTATING DRIVE SHAFT BY INDIVIDUAL CLUTCH-BRAKE MECHANISMS. WHEN A BOUNDARY WIRE IS SENSED BY COILS ON THE FRAME, THE DRIVE WHEEL FURTHEST
AWAY FROM THE BORDER IS UNCLUTCHED AND BRAKED TO PIVOT OR TURN THE MOWER. NO BACKUP MOTOR OR COMPLEX STEERING CONTROL IS REQUIRED. A PAIR OF ADJUSTABLE ROTARY CUTTER BLADE ASSEMBLIES ARE CARRIED ON THE FRAME.
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