Folding Stair with Tread Overhang
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United States of America Patent
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Issued Date -
Dec 7, 2023
app pub date -
Apr 18, 2023
filing date -
Apr 20, 2022
priority date (Note) -
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Abstract
An improved folding stair comprising a sequence of steps (101), each rotably mounted to a structure (102) via axes (103) located and oriented to facilitate rotation between deployed and stowed states, such that the steps exhibit tread overhang (109) in their deployed state. The step width (105) exceeds the step rise (107). In other embodiments the axes are to one side of the steps. In other embodiments the angle of rotation between deployed and stowed states exceeds the arccosine of step-above thickness (104) over step rise. In other embodiments the movement from deployed to stowed state moves the steps from the traversal path. In other embodiments the axes are either skew to the deployed tread, or to the traversal path, or to both. Other embodiments include a means of coordinating the steps' folding motion.
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