Adjustable modular staircase

Abstract

The adjustable modular staircase includes two stringers for rigid attachment to a building structure in parallel, opposed relationship to each other, a plurality of axially parallel pins protrude out of each of the stringers and are spaced equidistant apart there along, the pins in one stringer are axially aligned with the pins in the other stringer when installed in the building structure, and a plurality of step modules, each including a tread and at least one end wall. The end wall has a top edge for supporting one end of the tread, a bottom edge inclined with respect to the top edge, and a notch in the bottom edge for releasably pivotally engaging one of the pins, whereby the step module can pivot around the pin to allow for horizontal leveling of each of the treads so as to form a rough staircase used for the early stages of the building process. Each step module preferably includes a riser having an end supported by a front edge of the end wall. Finally, at the end of the building process, a plurality of finishing plates are fixedly attached onto the treads, risers, end walls and to the building structure to provide a proper surface finish of the staircase.

Dependencies are inferred from the claim text.