Foldable Ladder
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United States of America Patent
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Issued Date -
Jul 20, 2023
app pub date -
Aug 8, 2022
filing date -
Jan 20, 2022
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Abstract
Foldable ladder includes main ladder and auxiliary ladder, and top end of ladder frame of auxiliary ladder being connected to ladder frame of main ladder through hinge mechanism, wherein hinge mechanism includes main ladder hinge plate, auxiliary ladder hinge plate, and shaft pin lock assembly connecting main ladder hinge plate and auxiliary ladder hinge plate, wherein main ladder hinge plate includes first hinge plate, second hinge plate, and third hinge plate connected in “Z” shape sequentially, and in extending direction of pedal of main ladder: first hinge plate is fixed to outer side surface of ladder frame of main ladder, and located on outer side of third hinge plate; auxiliary ladder hinge plate is fixed to top end of ladder frame of auxiliary ladder, and shaft pin lock assembly passes through third hinge plate and auxiliary ladder hinge plate and connects auxiliary ladder hinge plate to third hinge plate.
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