Patent ID: 8453395

Claim:
A kit for erecting a stairway comprising: a first step module and an adjacent second step module, the first step module comprising a first riser and a first tread, the first riser being mounted on a first side thereof to at least near a front edge of the first tread and comprising a vertical and elongated slot on a second side thereof, the first tread being secured atop the first riser on one side thereof, the adjacent second step module comprising a second riser and a second tread, the second riser mounted on a first side thereof to at least near a front edge of the second tread and the second tread being secured atop the second riser on one side thereof and comprising a rear edge thereof adapted to receive a fastener, the adjacent second step module being adapted to be assembled with the first step module by engaging the fastener with the vertical slot of the first step module and securing the fastener to the rear edge of the second tread of the adjacent step module to secure the two step modules together, wherein the vertical slot comprises an inside wall that is angled opening along an upward slope away from the second tread of the adjacent second step module thereby defining a removable tip engaging for the second tread.