Patent ID: 7946084

Claim:
A stairway, comprising: a spiral stringer, comprising a plurality of stringer portions attached end to end, each stringer portion having a top surface and a side surface; and at least two stair assemblies disposed on the spiral stringer, each stair assembly comprising: a bracket, comprising a first and a second planar face that intersect angularly at a back end of the bracket with a supportive web disposed therebetween and a flange disposed perpendicularly from a side of the first face, the bracket provided with at least one aperture through the first face to mount the flange and first planar face in abutting relationship along respective side and top surfaces of the spiral stringer; a tread, having an outer end thereof affixed to the bracket; and a stanchion member, an inner end of the tread attached thereto, the stanchion member connecting the tread to the tread of a vertically adjacent stair assembly, such that a longitudinal axis of each stanchion member is offset from the axis of the stanchion member of each adjacent stair assembly.