Patent ID: 8316595

Claim:
A collapsible staircase having at least two repeating pattern tread assemblies, comprising: a first tread assembly including at least one first tread plate and a pair of telescoping support members attached to a rear surface along a width of the first tread plate; a second tread assembly including at least one second tread plate and a pair of telescoping support members attached to a rear surface along a width of the second tread plate; a connecting tread assembly including a tread plate and a first pair of telescoping support members attached to a rear surface along a width of the connecting tread plate for slidably engaging the first tread assembly pair of telescoping support members so that a height of the connecting tread assembly is adjustable with respect to the first tread assembly; the connecting tread assembly having a second pair of telescoping support members attached to a rear surface along a width of the connecting tread plate for slidably engaging the second tread assembly pair of telescoping support members so that a height of the connecting tread assembly is adjustable with respect to the second tread assembly; and the connecting tread assembly connecting the first tread assembly to the second tread assembly in a collapsible staircase.