Prefabricated stackable stair unit

Claim 1

In combination with a stair well including a front well having an opening onto a building floor, and a back wall opposite said front wall, an improved prefabricated stackable stair unit comprising: a stair flight having support means at one extremity for support thereof adjacent said opening in said front wall, said stair flight including a plurality of stairs and a pair of stringers attached to and supporting the ends of said stairs; a half landing having a width approximating that of said stair flight and including a platform and a pair of side members attached to and supporting said platform, the inward one of said side members including coupling means for attachment to complemental coupling means of a complemental half landing arranged in side-abutting relation to said first-mentioned half landing, said first-mentioned half landing further including support means at its outer end portion for the support thereof upon said back wall, the outward one of said side members and the outward one of said stringers having their adjacent terminal extremities connected together in continuous structural relation with the upper edge of said outward one of said side members being located above said platform, said inward one of said side members and the inward one of said stringers having adjacent terminal extremities, the upper edge of said inward one of said side members being located below said platform and in discontinuous relation relative to the upper edge of said inward one of said stringers; and a structural member of substantial strength extending between and rigidly connecting said terminal extremities for transferring loads between said inward ones of said side member and said stringer, said stair unit being supported solely by said front and back walls.