发明名称 Ladder top walk through extensions
摘要 Walk through ladder extensions are provided to attach to the upper ends of ladder side rails, and define a wide unobstructed space between them. The extensions can be gripped by a user to steady the user as the user moves onto a roof of a building against which the ladder is placed.
申请公布号 US2005236227(A1) 申请公布日期 2005.10.27
申请号 US20050042741 申请日期 2005.01.25
申请人 CLARK BRUCE D;FEIK FREDERICK G 发明人 CLARK BRUCE D.;FEIK FREDERICK G.
分类号 E06C7/18;E06C7/42;(IPC1-7):E06C7/42 主分类号 E06C7/18
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