Stair having alternate half treads

Details Stair having alternate half treads Stair having alternate half treads

1982-07-26

1985-04-09

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Wall- or floor-attached

Ladder

182106, 182194, 182228, E06C 902, B63B 2920

Patent

active

045096171

ABSTRACT:
A stair having a central stringer and two parallel side stringers. A plurality of vertically-spaced half treads is disposed on each side of the central stringer and extends between the central stringer and an adjacent side stringer. The half treads on one side of the central stringer alternate with those on the other side of the central stringer. The central stringer may or may not be a structural member depending upon the stair configuration but in all cases serves at least as a protective shielding of the inside corners of the treads, thereby minimizing user injury from the corners in case of a fall or other user mishap. A pair of handrails are disposed in a plane forward and parallel to a plane passing through the front edges of the treads and positioned with respect to the treads to provide support for a user.

REFERENCES:
patent: 665900 (1901-01-01), Hamilton
patent: 1415699 (1922-05-01), Porter
patent: 2518107 (1950-08-01), Wilson
patent: 2776793 (1957-01-01), Nystrom
patent: 3762500 (1973-10-01), Sarno
patent: 4199040 (1980-04-01), Lapeyre

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