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Folding ladder - GIF
Folding ladder.
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Previously:
https://www.homemadetools.net/forum/...494#post117152
https://www.homemadetools.net/forum/...584#post151593
https://www.homemadetools.net/forum/...434#post150970
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What's to keep it from going sideways and folding up while you are on it? Looks like an accident waiting to happen.
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Your weight on the rungs keeps it open and from folding up, because that notch on the top is a stop. Regardless of your design if your ladder goes sideways (unless it's a library one) you're in trouble :-)
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Nearly every fire truck in the country has something similar to this on it, only aluminum. They are called attic ladders. There is a folding latch on the bottom that keeps them from folding up while climbing them.