Patent ID: 7363998

Claim:
An improvement on a chassis structure of a walk-substituting cart, comprising a front chassis having a transverse rod at a rear end thereof, and an upright tube secured next to a middle of the transverse rod; a rear chassis having a transverse support rod at a front end thereof, a fitting space next to a front side of the transverse support rod thereof, and a supporting rod projecting upwards from a middle of the transverse support rod; an engaging plate secured on a rear side of the upright tube; the engaging plate having an upper side sloping down towards a rear; the engaging plate having an engaging hole thereon; a front coupling part secured on a rear side of the upright tube; a rear coupling part secured on a front side of the supporting rod on the rear chassis; a plurality of front insulating plates positioned right behind and connected to the front coupling part; each of the front insulating plates having a front powerful magnet secured on a middle of a rear side thereof; each of the front insulating plates having a plurality of front contacting terminals secured on the rear side thereof; wires being connected to the front contacting terminals and a power supply unit; a plurality of rear insulating plates positioned right in front of and connected to the rear coupling part; each of the rear insulating plates having a rear powerful magnet secured on a middle of a front side thereof; each of the rear insulating plates having a plurality of rear contacting terminals secured on the front side thereof; wires being connected to the rear contacting terminals and an actuating motor; a connecting member secured on an upper end of the supporting rod on the rear chassis; the connecting member sloping up towards a front; and a fixing mechanism joined to the connecting member; when the front chassis is pivoted on the rear chassis with the transverse rod of the front chassis being held in the fitting space of the rear chassis, the fixing mechanism being going to pass through the engaging hole so as to engage the engaging plate, thus fastening the front and the rear chassis together; after the front and the rear chassis are coupled, the front insulating plates being going to exactly face corresponding rear insulating plates with the front powerful magnets attracting corresponding rear powerful magnets, and with the front contacting terminals closely touching corresponding rear contacting terminals to electrically connect the power supply unit to the actuating motor.