US 6,634,145 B1Granted

Modular stone stair system

OwnerOrmsby Dolphinventor

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Abstract

A modular stone stair system using a plurality of modules in the form of stringers, risers, treads and landings in standardized thicknesses and widths. The risers, landings (if any) and treads have different widths dependent upon the width of the stairs desired, with the treads and landing (if any) being of the full width of the stair, and the risers being a modular width such that each tread or landing is underlain by a plurality of risers. Each level of the stair has a plurality of stringers, abutting the back of the tread and riser and running to the back of the stair. The stringers vary in depth depending upon how many steps are to be present, such that each level, except the bottom, overlaps the tread and riser of the next lower level by a fixed amount. The system can easily be assembled by two people, using a shovel, a level, and a ruler, giving the homeowner or contractor the option of choosing threshold heights, widths, and landings with varying depths.

Claims10

Dependent claims

A method of constructing a modular stone stair having a plurality of steps, a width, a depth and a height, using a plurality of stone stair modules, the modules comprising stringers, treads, and risers, each module having a width, a depth and a thickness, the thickness of the stringers being equal to a sum of the thicknesses of a tread and a riser, the plurality of stringers having a plurality of modular lengths, the treads having a width equal to the width of the stair, the risers having a plurality of widths such that the width of a set of an integral number of risers is approximately equal to the width of the stair, and the depth of a riser is approximately equal to or slightly less than the depth of a tread, the method comprising the steps of:

a) placing three parallel spaced apart sets of stringers lined up with the back of the stair, each set comprising at least one stringer, the stringers in the set being chosen to have a total depth equal to the depth of the stair less the depth of a riser;
b) placing a plurality of risers in front of the stringers, the plurality of risers having a combined width approximately equal to the width of the stair;
c) placing a tread onto the risers, adjacent to the stringers;
and
d) repeating steps a) through c), with the total depth of the stringers being reduced in each step by an amount equal to a desired overlap, until a desired number of stairs have been assembled.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/180,242Filed 26 Jun 2002
Granted: 21 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

E04F 11/116
Treads: of stone, concrete or like material or with an upper layer of stone or stone like material, e.g. ceramics, concrete; of glass or with an…
E04F 11/035
Characterised by the supporting structure: stairways consisting of a plurality of assembled modular parts without further support
E04F 11/09
Stairways; Layouts thereof: tread-and-riser units
E04F 2011/021
Stairways characterised by the use of specific materials for the supporting structure of the treads: mainly of stone or stone like materials, e.g.…