Ladder
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United States of America Patent
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-
Dec 20, 1983
Grant Date -
N/A
app pub date -
Jan 27, 1981
filing date -
Feb 2, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a stepladder, with two legs which are connected with each other swingably around an axis in the region of an upper end of the legs, at least one of the legs has transverse support members which are supported by a first pair of stiles, and arranged spaced apart from each other in the longitudinal direction of the first pair of stiles to form the treads, said transverse support members being developed as board-shaped threads which, when the legs are spread apart a predetermined maximum distance, the standing surface of the transverse support members is horizontal and lies in horizontal planes, the treads being connected swingably about axes parallel to each other, to the first pair of stiles and to respective link members which are parallel to the first pair of stiles whereby a mutual supporting relationship between the first pair of stiles and the link members upon a predetermined maximum spread of the legs so as to increase the resistance to bending of the first pair of stiles and limit the swingability of the treads around their axis in a first direction of swing, the treads projecting beyond one side edge of the first pair of stiles facing away from the other leg such that stepping upon the treads causes a moment of rotation in a second direction which brings the link members toward the first pair of stiles.
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