| 摘要 |
A wheel hub with a freewheel which has a hub shaft passing through a hub proper adapted to rotate smoothly on steel balls and a gear ring equipped with a sprocket wheel fitted in said hub proper by a ratchet mechanism. The steel balls are held adjustably by both a shoulder of the hub proper and a screw cap, and a lock nut is screwed on the hub proper at the outside of the screw cap so as to prevent loosening of the screw cap.
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