E - Fixed Constructions – 06 – C
Patent
E - Fixed Constructions
06
C
E06C 7/02 (2006.01) E06C 1/12 (2006.01) E06C 1/38 (2006.01) E06C 7/06 (2006.01)
Patent
CA 2157842
Disclosed is an extension ladder mainly including a pair of telescopic legs consisting of a plurality pairs of straight round tube members, a plurality of rungs in the same numbers as that of the tube member pairs and each having two lateral ends for the two legs to pass therethrough, a plurality sets of locking mechanisms and lock ensuring mechanisms, and a general switch assembly disposed beneath the lowest rung. The tube member each has a sleeve member and a plug assembly disposed around a top end and in a bottom end, respectively. Each plug assembly includes a set of cover members and a set of inserts having an upper and a lower movable hook members connected thereto. The upper hook member in a lower tube member separately links with the lower hook member in a higher tube member, limiting the tube members of the telescopic legs to be sequentially extended stair by stair. The upper hook member each has an air cock provided at a bottom end thereof to close or open an air port formed on a base of the inserts. The air cocks and the air ports, together with two one-way valves separately disposed at a lower portion of the lowest tube member pairs, enable the ladder to be quickly extended from a collapsed state and be collapsed from an extended state at moderate speed. The locking mechanisms and lock ensuring mechanisms are disposed beneath each rung to effectively prevent the ladder from unexpectedly collapsed due to any accidental touch of the locking mechanisms. The general switch assembly serves to actuate and control the sequential and moderate collapse of the rungs.
Fetherstonhaugh & Co.
Wang Tai-Lin
LandOfFree
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