Patent ID: 8622175

Claim:
A collapsible ladder comprising: an uppermost ladder section; a lowermost ladder section; and several collapsible ladder sections, one or more of the several collapsible ladder sections comprising two hollow ladder bars arranged parallel to each other and interconnected at an upper end by a rung, and each collapsible ladder section being telescopically inserted into a lower ladder section; wherein each ladder bar of a collapsible ladder section has a locking hole adjacent a lower end part of the ladder bar and an extension below the locking hole; wherein retaining mechanisms are provided in the rungs for locking the collapsible ladder sections relative to one another when the collapsible ladder sections are extended, one of more of the retaining mechanisms comprising a locking pin which can be brought into an extended position in order to engage a corresponding locking hole provided in the ladder bar of the ladder section positioned there above; and wherein for one or more of the collapsible ladder sections, a non-locking ladder bar slot or groove is formed in the extension of each of the ladder bars and reaching from a distance below the locking hole of the ladder bar to a bottom of the ladder bar.