| 摘要 |
A low-friction thin-hub plastic multi-part sheave for handling wire, has two joined disc-like members with conical rim portions which together form a V-groove for the wire. The members have apertured central hub portions provided with facing shoulders that engage cooperable, oppositely-facing shoulders on the outer race member of an anti-friction bearing assemblage, to hold the latter captive between the disc-like members. The central hub portions and anti-friction bearing assemblage have respective, oppositely-facing, parallel exposed side surfaces which are flush and disposed in spaced-apart parallel planes, making for a thin hub assemblage. The cooperable, oppositely-facing shoulders are preferably conical, and the disc-like members have large, shallow circular recesses in their exposed sides whereby cutting-off a rim portion of one member will enable it to nest in the recess of an adjoining, similar but uncut disc-like member so that a plurality of sheaves with cut rim portions can be mounted in tandem on a common shaft and require but little space.
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