Abstract: A swivel yoke assembly is used for supermarket mobile material handling equipment. The yoke assembly includes a yoke, a bearing and a cage. The yoke can be made from low grade steel. The swivel bearing can withstand heavy cart loads and has an outer race and a split inner race. The races cover a large part of the balls, so as to provide support. Also, the balls are tightly packed into the bearing leaving little total space between the balls, again to provide support for the load. The outer race is clamped to the yoke by the cage. The cage is secured to the yoke by staking, wherein tabs are inserted into slots in the yoke and the tabs are formed with double shoulders. A cover is provided to protect the bearing from the environment.

Abstract: A wheel assembly for a material handling cart includes a wheel hub having first and second openings in first and second hub faces, each concentric with and extending along a central axis of the wheel hub. First and second ball bearings are located in the openings. Inner rings of the bearings are wider than the outer rings, and the inner rings contact one another. The outer rings are separated by, and are in contact with, a hub member. First and second bearing sleeves in the first and second openings contact and retain the bearings, and form first and second journal bearings. The sleeves contact journal surfaces on a portion of each inner ring that extends parallel to the central axis from an outer face of each outer ring away from a medial plane of the wheel assembly.

Abstract: A wheel assembly for a material handling cart includes a spanner bushing having a cylindrical outer surface, a central axis, and an opening through the spanner bushing along the central axis. A bearing has an inner race and an outer race, wherein the inner race surrounds and contacts the cylindrical outer surface of the spanner bushing. A bushing is located adjacent to the bearing, wherein the bushing surrounds and contacts the cylindrical outer surface of the spanner bushing, and the bushing has a non-cylindrical outer surface contour. A hub is centered about the central axis and contacts the outer race of the bearing and the outer surface of the bushing, wherein the bushing rotates with the hub on the cylindrical outer surface of the spanner bushing. Lubricant cavities in the bushing lubricate the bearing and the spanner bushing. Bushing ridges and lips fix the bushing in relation to the hub.