A small cart - body small, light weight, can work in the narrow channel and loaded into the elevator; the control part installed on the upper part of the handle, easy operation, flexible, reliable and safe control mechanism; with overload automatic unloading device, so as to effectively protect the main frame and other parts; using high strength polyurethane wheel, has the characteristics of smooth and flexible, lightweight, no magnetic field and spark; mold production, moderate price, stable quality.