Extension ladder with improved mechanism

Details Extension ladder with improved mechanism Extension ladder with improved mechanism

2006-05-17

2008-01-08

Chin-Shue, Alvin (Department: 3634)

Fire escape, ladder, or scaffold

Ladder

Slidable nested single rung units

C182S207000

Reexamination Certificate

active

07316293

ABSTRACT:
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 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 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.

REFERENCES:
patent: 4989692 (1991-02-01), Min
patent: 5495915 (1996-03-01), Weston et al.
patent: 5743355 (1998-04-01), McDonnell et al.
patent: 6708800 (2004-03-01), Kieffer et al.
patent: 2004/0195043 (2004-10-01), Johansson

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