US PATENT SUBCLASS 182 / 156
.~ Collapsible ladder

Current as of: June, 1999
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182 /   HD   FIRE ESCAPE, LADDER, OR SCAFFOLD

152  DF  UNITARY FOLDABLE, RIGID SCAFFOLD OR LADDER {2}
156.~ Collapsible ladder {3}
157  DF  .~.~> Lazy tong type {1}
159  DF  .~.~> Parallel moving side, pivoted rung or step {3}
163  DF  .~.~> Folding stile {1}

DEFINITION

Classification: 182/156

(under subclass 152) Device relatively movable stiles or rungs.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1, for a pivoted step on an angularly movable support with means to keep the step horizontal.

33+, for a unitary folding device wherein a ladder structure folds beneath a top step or seat to convert a step ladder to a stool.

95+, for a unitary foldable ladder structurally installed.

165+, for a rigid ladder having a pivoted prop.