US PATENT SUBCLASS 182 / 67.5
.~.~.~ Having screw rod for erecting ladder about horizontal pivot

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

63.1  DF  HAVING TRANSPOSITIONING BASE AND ERECTING MEANS {4}
64.1  DF  .~ Ladder pivotably mounted on transpositioning base (e.g., on vehicle) {2}
65.1  DF  .~.~ About vertical axis {3}
67.5.~.~.~ Having screw rod for erecting ladder about horizontal pivot

DEFINITION

Classification: 182/67.5

Having screw rod for erecting ladder about horizontal pivot:

(under subclass 65.1) Device comprising a ladder elevating mechanism actuated by a rotary motion of a threaded rod within a threaded sleeve.