| 摘要 |
An earthen manure storage cover includes a sheet of cover material of suitab le size for spanning the storage and which is coupled to a main roller extendin g along one edge of the sheet for rolling the sheet thereon. A base roller extends parallel to the main roller and rotatably supports the main roller thereon along a full leng th of the main roller. A plurality of roller supports are provided at spaced positions alon g the rollers, each including a cradle for rotatably supporting the base roller therein and at least one guide wheel providing lateral support to the main roller to maintain the mai n roller rotatably supported on the base roller.
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