- 专利标题: MANHOLE FRAME WITH ONE OR MORE HANDHOLDS
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申请号: US15813475申请日: 2017-11-15
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公开(公告)号: US20180073212A1公开(公告)日: 2018-03-15
- 发明人: Ronald ARMSTRONG
- 申请人: Ronald ARMSTRONG
- 主分类号: E02D29/12
- IPC分类号: E02D29/12 ; E02D29/14
摘要:
A design for manhole frames is provided which provide one or more handholds near the entrance to the manhole so that the ladder rungs can be made lower and the access space at the entrance to the manhole thereby increased. The handhold can be cast into the cover-supporting lip, a detachable vertical handle or can be a movable handle which is below the level of the manhole when not in use or extended above ground level when in use.
公开/授权文献
- US10030351B2 Manhole frame with one or more handholds 公开/授权日:2018-07-24
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