发明名称 Apparatus for forming sprinkler head protector
摘要 Apparatus for forming a concrete shield around a sprinkler head is a frusto-conical shaped form having a removable concentric flexible sleeve therein. A rotatable trowel is positioned inside the form to smooth the upper concrete surface. An inverted cup adapted to fit over the head of the sprinkler during the concrete forming process prevents wet concrete from contacting the top of the sprinkler head.
申请公布号 US4170443(A) 申请公布日期 1979.10.09
申请号 US19780935456 申请日期 1978.08.21
申请人 BECKER, CONRAD R 发明人 BECKER, CONRAD R
分类号 B28B1/29;B28B19/00;E04G21/10;E04G21/30;(IPC1-7):B28B7/00;B29C5/00 主分类号 B28B1/29
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