초록 ▼

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

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.

대표청구항 ▼

A stairway comprising: first and second spaced, parallel side tread supports adapted for mounting between an upper level and a lower level at a predetermined angle of inclination; a central tread support having an outer edge, said central support disposed between said side supports and parallel ther

A stairway comprising: first and second spaced, parallel side tread supports adapted for mounting between an upper level and a lower level at a predetermined angle of inclination; a central tread support having an outer edge, said central support disposed between said side supports and parallel thereto; a plurality of first spaced tread members extending laterally between the first side tread support and said central tread support, each of said first tread members having a foot support portion; a plurality of second spaced tread members extending laterally between said central tread support and the second side tread support, each of said second tread members being disposed between adjacent ones of said first tread members in an alternating relationship therewith, each of said second tread members having a foot support portion; each of said foot portions on the first and second tread members having a forward edge, a lateral inner edge, a lateral outer edge and a rear edge; first and second handrails each supported on a respective side of the tread members and disposed in a plane forward and parallel to a plane passing through the forward edges of the foot support portions, the handrails positioned at a height in relation to the foot support portions to lie under the armpits and support the forearms of a user while descending the stairway; said first tread members being of substantially identical construction, the first tread members being complimentary to the second tread members; said tread members integrally formed as a single unitary structure, each tread member including: an upwardly extending flange at the inner and outer lateral edges and the rear edge of the foot support portion, and having mounting portions for attaching the tread member to respective side and central tread support members; and a downwardly extending flange at the forward edge of the foot support portion, said downwardly extending flange having side portions for attaching the tread member to respective side and central supports; said first and second tread supports comprising first and second right angle members with an inner angle surface and an outer surface, said central tread support comprising a U-shaped member having an inner surface and an outer surface; said mounting portions of the upwardly extending flanges of the first and second tread members adapted to confront the inner angle surface of the respective first and second right angle members and the inner surface of the U-shaped member.