发明授权
- 专利标题: Dual lifting manhole cover
- 专利标题(中): 双重升降井盖
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申请号: US11938444申请日: 2007-11-12
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公开(公告)号: US07905679B2公开(公告)日: 2011-03-15
- 发明人: Kevin S. Vrondran , Jeremy I. Johnson , Andrew J. Malpass
- 申请人: Kevin S. Vrondran , Jeremy I. Johnson , Andrew J. Malpass
- 申请人地址: US MI East Jordan
- 专利权人: East Jordan Iron Works, Inc.
- 当前专利权人: East Jordan Iron Works, Inc.
- 当前专利权人地址: US MI East Jordan
- 代理机构: Warner Norcross & Judd LLP
- 主分类号: E02D29/14
- IPC分类号: E02D29/14
摘要:
A one-piece, unitary manhole cover has dual lifting ports that drain through the outer circumferential edge of the cover. A lifting channel runs from the interior of the upper face out to the outer circumferential edge. A lifting bar spans the lifting channel and defines an ergo lifting port and a pry bar lifting port. Both the ergo lifting port and the pry bar lifting port drain through the outer circumference of the manhole cover.
公开/授权文献
- US20090123227A1 DUAL LIFTING MANHOLE COVER 公开/授权日:2009-05-14
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