| 摘要 |
A back plate for a throwing wheel has a plurality of back plate sectors (10) mounted on a core (2), the core (2) is releasably mountable on the drive shaft of an abrasion machine. The back plate sectors (10) extend generally radially from the axis of the drive shaft and each terminate in an arcuate band (12). Together, the sectors form a generally continuous circumferential band (12) which encircles the core (2). The use of a plurality of sectors (10) allows the arcuate bands (12) only to be case hardened to resist abrasion in operation. This allows the mass of the assembled throwing wheel to be reduced and also reduces the distortion caused by case hardening of the whole wheel as carried out in the prior art.
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