| 摘要 |
A flight for collecting sludge by sweeping comprises a roller shoe, comprising (a) a frame having a substantially U-shaped cross section and having a pair of side plates, (b) a shaft having a diameter-enlarged portion at one end and a threaded portion at the other end, and fixed to the side plates, and (c) a roller rotatably supported by the shaft between the side plates, wherein the frame is constituted by an injection-molded synthetic resin, and the roller is made of a synthetic resin.
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