Patent ID: 8914944

Claim:
A handcart caster, comprising: a bracket and a rolling wheel component disposed on a lower end of the bracket; a radial directional convex part disposed on an upper part of the bracket; a rolling bearing disposed in a cavity of the radial directional convex part, the rolling bearing including an outer ring of a bearing, an inner ring of the bearing, a plurality of steel balls disposed between the outer ring of the bearing and the inner ring of the bearing, and two-layer grooves disposed on surfaces of the outer ring of the bearing and the inner ring of the bearing facing each other wherein the steel balls are disposed in the two-layer grooves and a cage is disposed outside of the steel balls; and a plurality of convex ridges for fixing the outer ring of the bearing disposed on an inner wall of the radial directional convex part, wherein the inner ring of the bearing has a convex rim extending outward in a radial direction, and a connecting screw-thread or slot is disposed externally of the convex rim.