发明名称 Ladder stiles and ladders produced therefrom
摘要 The invention is directed to strong, lightweight, electrically non-conducting ladder stiles and ladders formed therefrom. Each ladder stile comprises a tension and compression portion structurally interconnected by a spacing portion. The spacing portion has a cross section which varies over the length of the stile between sections where the entire spacing portion is the full width of the stile and sections where at least part of the spacing portion is less than the full width of the stile. The ladders of the invention are formed of two ladder stiles interconnected by rungs.
申请公布号 US5515942(A) 申请公布日期 1996.05.14
申请号 US19940245061 申请日期 1994.05.17
申请人 PALMERSTON EXTENSION LADDER COMPANY LIMITED 发明人 WOODFIELD, BRUCE H.
分类号 E06C1/06;E06C7/08;E06C7/10;(IPC1-7):E06C1/00;E06C7/00 主分类号 E06C1/06
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