| 摘要 |
A roller for conveyors has an elongated cylindrical sleeve. Antifriction roller bearings are mounted on a shaft passing through and coaxial with the sleeve at each end thereof. Holding means are provided which cooperate with the shaft and the inner race of the bearings for retaining the bearings from axially moving along the shaft. An intermediate annular tapered plastic ring engages the holding means with its radially inward surface and is provided on its radially outward surface with coaxial gear teeth. An outer annular tapered plastic ring has on its radially inward surface axial gear teeth engaged with those of the intermediate ring and is configurated to engage the sleeve and axially lock the intermediate ring when the rings are wedged between the sleeve and the holding means. On one end of the sleeve, the intermediate ring extends axially beyond the sleeve and is provided with sprocket wheels.
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