| 摘要 |
A plurality of parallel elongated side members are angularly spaced apart on an imaginary cylindrical surface and have first and second ends each. A first end-connecting assembly connects the first ends of the side members. A shaft-coupling sleeve is provided on the first end-connecting means and concentric with the cylindrical surface. At least one integral bearing race surrounds the side members and is axially spaced from said first end-connecting means. A second connecting assembly detachably connect the bearing race to the side members.
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