Patent ID: 7699128

Claim:
In combination with a shopping cart, including a plurality of rear legs, the improvement which comprises: a plurality of clips removably connected to said rear legs of said shopping cart; a base having a top, a bottom, a front, a middle, and a rear, wherein said front is attached to said plurality of clips; a plurality of wheels attached to said front and said rear of said bottom of said base; a power source attached to said rear of said bottom of said base; a control box attached to said rear of said bottom of said base; a CPU enclosed by said control box; a right angle motor attached to said middle of said bottom of said base; a small turning gear connected to said right angle motor; a large turning gear frictionally engaged with said small turning gear; a drive motor attached to said large turning gear; a driveshaft having opposing ends and a middle attached to said large turning gear by a plurality of brackets; a drive belt having opposing ends with one end connected to said drive motor and said opposing end connected to said middle of said driveshaft; a plurality of drive wheels connected to said opposing ends of said driveshaft; a plurality of front rails having opposing ends with one end attached to said front of said base; a plurality of side rails having opposing ends with one of said opposing ends telescopically protruding from said front rails; a plurality of rear rails having opposing ends with one end releasably receiving one of said opposing ends of said side rails opposite said front rails; and a rear support having opposing ends and a middle with one end attached to said top of said rear of said base and said opposing end attached to one of said opposing ends of said rear rails, opposite said side rails; and a controller suspended between said front rails.