Thrust bearing feature for side plate of bearing block

A bearing block having thrust bearings, said bearing block comprising a pair of spaced side plates having inwardly facing surfaces, a circular sheave rotatably mounted about an axis of rotation between the side plates, said sheave having an annular side surface facing one of the inwardly facing surfaces of said side plates, and a pair of spaced thrust bearing races in said one inwardly facing surface, said races comprising a groove in the form of an arc in opposition to the annular side surface of the sheave, bearing return means for providing a bearing return circuit between the ends of the arc, and a plurality of ball bearings in said groove and said bearing return means, the ball bearings in said groove projecting about said one inwardly facing surface and being engageable with said annular side surface, with said ball bearings circulating in said groove and said bearing return means.

A bearing block having thrust bearings, said bearing block comprising a pair of spaced side plates having inwardly facing walls, a sheave mounted for rotation about an axis of rotation between said side plates, said sheave having a pair of annular side surfaces, a circular groove in the inwardly facing wall of each side plate in opposition to said annular side surfaces and a plurality of ball bearings disposed in each groove and projecting above the inwardly facing walls of said side plates, said ball bearings being rotatable and capable of circulation around said groove.

A bearing block comprising a pair of side plates having inwardly facing planar walls, an inner bearing race secured between said side plates, a sheave rotatably mounted around said inner race, said sheave being ring-shaped and comprising a groove around the outer periphery, a pair of annular side walls, and an inner wall defining an outer bering race spaced from said inner race, a plurality of roller bearings between said inner and outer races, and a plurality of exposed ball bearings carried by said inwardly facing walls and being engageable with the annular walls of the sheave.