Ladder improvements

Details Ladder improvements Ladder improvements

1991-09-26

1992-12-29

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Door and ladder

182 98, E06E 900

Patent

active

051744112

ABSTRACT:
A loft ladder which can be pivotally and slidably mounted to loft opening has counterbalancing means including a resiliently biased pivotal arm, connected to the loft ladder by a link member pivotally connected between the pivotal arm and the loft ladder to allow the ladder to turn about is pivotal connection to the loft opening over at least a limited extend. The arm has a two-stage resilient biasing spring offering a greater resilient force over part of the range of movement of the arm. A hand rail of the ladder is supported on a section of the ladder by spacers allowing the hand rail to be carried at a lateral distance from the ladder stile greater than the lateral space occupied by the counterbalance mechanism. A releasable catch for retaining two ladder parts in a selected position comprises two moveable catch members mounted on respective stiles, and interconnected together.

REFERENCES:
patent: 1621539 (1927-03-01), Hemingway
patent: 1811709 (1931-06-01), Bessler
patent: 2580978 (1952-01-01), Triller
patent: 2931456 (1960-04-01), Harmon

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