发明名称 |
Manhole |
摘要 |
A manhole embodiment that includes a metal top ring, metal removable cover, and a flexible sheet steel skirt welded to the top ring. The skirt has a stiffening and footing flange rolled laterally inwardly or outwardly from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the very bottom of the manhole.
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申请公布号 |
US5899629(A) |
申请公布日期 |
1999.05.04 |
申请号 |
US19980123014 |
申请日期 |
1998.07.27 |
申请人 |
UNIVERSAL VALVE CO., INC. |
发明人 |
MILO, JOSEPH V.;PETTESCH, MARTIN C. |
分类号 |
E02D29/14;(IPC1-7):E02D29/14 |
主分类号 |
E02D29/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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