Locking joint for collapsible ladders and other structures
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United States of America Patent
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Dec 29, 2015
Issued Date -
N/A
app pub date -
Aug 13, 2012
filing date -
Aug 12, 2011
priority date (Note) -
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Abstract
A rigid structure such as a ladder is disclosed having rotating hinges that allow the ladder to fold up and/or be disassembled and assembled. The hinge or hinges can be provided between ladder sections with one ladder section having a male hinge element, and another having a female hinge element. A cam element provided with the female hinge element can be moved between an unlocked position in which the ladder sections can rotate with respect to each other, and a locked position in which the structure is rigid.
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