发明名称 FALL PROTECTION INSERT FOR MANHOLE
摘要 A fall protection insert for a manhole, includes a body adapted for insertio n down a manhole. The body has a peripheral edge. Between three and five engagement members, are mounted along the peripheral edge of the body. Each of the engagement member s are movable between a retracted insertion position and an extended engagement position. In the extended engagement position each of the engagement members extend outwardly past the peripheral edge of the body, thereby engaging the peripheral walls of a manhole. A lever is provided for selectively moving each of the engagement members from the retracted insertion position to the extended engagement position.
申请公布号 CA2480252(A1) 申请公布日期 2006.03.22
申请号 CA20042480252 申请日期 2004.09.22
申请人 MARTINUK, DWAINE E.;ELIAS, EARL S. 发明人 MARTINUK, DWAINE E.;ELIAS, EARL S.
分类号 E02D29/12 主分类号 E02D29/12
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