| 摘要 |
The specification discloses a trolley wheel assembly useful in conveyor applications especially in the food processing industry. The assembly includes a plastic wheel, metallic outer and inner races positioned with respect to the wheel and antifriction means such as ball bearings between the races. The outer races include noncircular, circumferential surfaces, preferably flat or rectilinear edges on radial flanges of the annular, contoured rings forming the outer races, engaging corresponding noncircular surfaces on the wheel to prevent rotation between the wheel and outer races. The outer races are also axially retained by either a circumferential or stud portion of the plastic wheel formed over and against the outer surface of said outer races.
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