发明名称 Ladder attachment
摘要 A ladder attachment including an adjustable frame assembly detachably connected to the end of a section of a conventional extension ladder, the frame assembly cooperating with the side rails of the ladder to form a hook portion for extending over the ridge of a pitched roof to thereby allow the ladder to be supported in an inclined position on the roof.
申请公布号 US4311207(A) 申请公布日期 1982.01.19
申请号 US19800130157 申请日期 1980.03.13
申请人 LURRY, PERCELL C. 发明人 LURRY, PERCELL C.
分类号 E06C1/36;E06C7/48;(IPC1-7):E06C7/48 主分类号 E06C1/36
代理机构 代理人
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