Universal hinged treads for folding attic stairs

Details Universal hinged treads for folding attic stairs Universal hinged treads for folding attic stairs

2005-10-28

2009-08-25

Spahn, Gay Ann (Department: 3635)

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

C052S183000

Reexamination Certificate

active

07578371

ABSTRACT:
A universal hinged tread system includes a folding stair set with one or more primary treads. At least one auxiliary tread is hingedly attached atop at least one primary tread. The folding stair set includes at least two hingedly attached sections. The hingedly attached sections fold flat against each other when in a stowed position, and every other folding stair section is inverted when in the stowed position. Each auxiliary tread is angularly displaced from its primary tread as its folding stair section is inverted. The auxiliary treads do not obstruct any primary treads on other sections when in a stowed position. The auxiliary treads include a beveled lower front edge to aid the auxiliary treads in deflecting.

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