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US 4,951,434 AGranted
Pre-formed stair construction
OwnerGeorge A. Schmidtinventor
Life of this patent
Estimating the term…
Abstract
A prefabricated stairway formed of a plurality of preformed steps composed of wear-resistant plastic or composite material which can be injection molded in units of one or more steps to permit inexpensive mass production and which are simple and inexpensive to install and can be formed of colored material to provide a highly aesthetic appearance.
Claims15
A prefabricated stairway having a plurality of preformed steps, each of said steps comprising:
- a riser portion extending inclined upwardly and forwardly and having a lower portion which curves forwardly and has a flange projecting downwardly and rearwardly from the edge of said lower portion,
- a tread portion extending horizontally rearward from the upper edge of said riser portion, and
- a generally U-shaped channel extending along the rear edge of said tread portion and extending downwardly and rearwardly from said tread portion for mating with adjacent steps to form said stairway.
A prefabricated stairway having a plurality of preformed steps, each of said steps comprising:
- a riser portion extending upward,
- a tread portion extending horizontally rearward from the upper edge of said riser portion,
- a generally U-shaped channel extending along one edge of said step for mating with adjacent steps to form said stairway, and
- an end panel joining said riser portion with said tread portion.
1 more element
Dependencies are inferred from the claim text.