| 摘要 |
An extension ladder with improved mechanism 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 t he rung becomes smaller when it is in a higher location. The upper ladder section and lower ladder section can be interconnected and fit with each other, and 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 a through hole of said ladder section to secure the extension between each ladder section, and the outside of said locking mechanism is covered by the transverse step portion. By the improved locking mechanism, the extension ladder can be assembled easily and firmly for providing superior safety to people, even when an external force is applied.
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