发明名称 Tubular insert for excavated hole with safety cover
摘要 A tubular insert sleeve for an excavated hole and a safety cover fitted to cover an operatively upper end of the insert sleeve are provided to maintain the integrity of an excavated hole and limit access to the hole in order to improve the safety of the public. The sleeve is made of cooperating segments which can easily be separated and which form a sleeve when assembled. The operatively upper end of the assembled sleeve forms an outwardly extending bell-shaped end of greater outer diameter to define an outwardly extending flange which is more easily grasped for removal of the sleeve from an excavated hole.
申请公布号 US2007295421(A1) 申请公布日期 2007.12.27
申请号 US20070798654 申请日期 2007.05.16
申请人 BARTELS BERNARD G;BARTELS DARREN B;BEAUDRY MARC;VAN BUUREN DARREN 发明人 BARTELS BERNARD G.;BARTELS DARREN B.;BEAUDRY MARC;VAN BUUREN DARREN
分类号 F16L55/115 主分类号 F16L55/115
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