Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1998-08-13
2000-01-11
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182127, A62B 500
Patent
active
060125454
ABSTRACT:
A foldable vehicle ladder system for allowing a user to easily view and access the interior portion of a truck box and other equipment. The inventive device includes a pair of base members attached in parallel to a side of a truck box, a pair of lower arms pivotally attached to the pair of base member, a pair of upper arms pivotally attached to the upper portion of the pair of base members, a pair of support members having a plurality of rungs attached between are pivotally attached to the distal ends of the lower arms and the upper arms, and a pair of latches attached to the pair of base members for securing the ladder portion in a vertical storage position. The ladder portion of the invention extends downwardly at an angle to assist supporting the vertical weight of the user when climbing. A pair of upper wedges and a pair of lower wedges limit the downward movement of the lower arms and upper arms. The upper arms are preferably shorter in length than the lower arms to allow the upper portion of the invention to be closer to the truck box when extended downward. The lowest rung is preferably lower than the lower edge of the truck box when the present invention is fully extended to allow easy access for the user.
REFERENCES:
patent: 375701 (1887-12-01), Fallgatter
patent: 3601220 (1971-08-01), Saucier
patent: 3869022 (1975-03-01), Wallk
patent: 4021071 (1977-05-01), Norman
patent: 4492286 (1985-01-01), Lemire
patent: 5538100 (1996-07-01), Hedley
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