发明申请
- 专利标题: Extension ladder with improved structure
- 专利标题(中): 延伸梯结构改善
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申请号: US11154600申请日: 2005-06-17
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公开(公告)号: US20060283665A1公开(公告)日: 2006-12-21
- 发明人: Kuo-Ching Yao
- 申请人: Kuo-Ching Yao
- 主分类号: E06C1/00
- IPC分类号: E06C1/00
摘要:
An extension ladder with improved structure includes a plurality of ladder sections, connection kits, locking mechanism, and transverse step portions; wherein each ladder section is a hollow rung, and the caliber of the rung becomes smaller when it is in a higher location. The upper ladder section and lower ladder section can be interconnected and fit each other; said connection kits are horizontally provided in the upper end of said ladder section. The internal part of said connection kit is provided with a locking mechanism to snap-fit into the through hole of said ladder section to secure the extension between each ladder section. The outside of said locking mechanism is covered by the transverse step portion, by which the ladder can be assembled conveniently and securely, appliance safety can be improved, and ladder life can be prolonged.