Extension ladder apparatus

Details Extension ladder apparatus Extension ladder apparatus

E - Fixed Constructions

06

C

E06C 1/12 (2006.01) E06C 1/30 (2006.01)

Patent

CA 2504437

An extension ladder apparatus comprises a plurality of ladder sections, transverse step portions, and locking mechanism, wherein each ladder section is composed of hollow rungs, end caps, and connection kits; the caliber of each hollow rung becomes smaller when the hollow rung is in a relatively high location, which allows the hollow rung to extend and extract to fit each other; a horizontally positioned locking mechanism is connected with the connection kit of said ladder section; wherein said end caps, hollow rungs, and connection kits are stuck in place and then fastened, while connection kits are wrapped by transverse step portions to prevent rust damage, which improves appliance safety and prolongs ladder life.

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