US 10,260,239 B2 · Wedge tread stair box system

Abstract

A stair box system made of a stair box core, stringers, risers and treads. The inner surfaces of the stringers have a discontinuous series of mortises positioned to engage only with the treads. Each tread is beveled from the front to back surfaces and each of the riser is beveled from the top to the bottom surface. Each tread features one or more notches cut into its back surface and each riser includes a complementary hook cut into its bottom surface. The hooks on the risers engage the notches on the treads forming an open-faced channel. Removable covers fit over the treads of the stair box core. These covers protect the stair box core and/or they feature decorative building materials like hardwood or tile. The system allows the user to upgrade their stairs by replacing the covers with covers featuring a different finished surface.

Claims14

Dependent claims

A stair box system comprising:

two stringers each with a surface featuring a plurality mortises;
a first plurality of risers each having a top surface, a bottom surface, a front surface, a back surface and two side surfaces;
wherein each riser is beveled from the top surface to the bottom surface such that the top surface is wider than the bottom surface;
a first plurality of treads having a front surface, a back surface, a top surface, a bottom surface and two side surfaces;
wherein each tread is beveled from the front surface to the back surface such that the front surface is wider than the back surface;
and
wherein each side surface of each tread is configured to engage with the plurality of mortises featured on the stringers.

4 more elements

A stair box assembly comprising:

two stringers each with an inner surface featuring a plurality mortises;
a spacer board attached to an outer surface of each of the stringers;
a first plurality of risers each having a top surface, a bottom surface and two side surfaces, said risers being tapered from the top surface to the bottom surface such that the top surface is wider than the bottom surface;
a first plurality of treads having a front surface, a back surface, a top surface, a bottom surface and two side surfaces, said treads being tapered from the front surface to the back surface such that the front surface is wider than the back surface;
wherein each tread of the first plurality of treads features at least one notch cut into the back surface of each tread and each riser of the first plurality of risers features at least one hook cut into the bottom surface of the riser and each hook is configured to engage with the at least one notch on each tread;
and
wherein when the risers and treads are engaged, the hooks form a channel on an underside of the stair box, said channel being configured to accept a length of material;
and
wherein the plurality of mortises are configured to engage with the side surfaces of the treads;
a first plurality of removable covers, wherein each cover is configured to fit over and cover a single tread of the first plurality of treads.

7 more elements

Dependencies are inferred from the claim text.

Wedge tread stair box system

Life of this patent

Wedge tread stair box system

Life of this patent

Abstract

Claims14