US PATENT SUBCLASS 182 / 67.2
.~.~.~.~.~ By use of screw

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}
66.1  DF  .~.~.~ Extension ladder (i.e., ladder having sliding section) {2}
67.1  DF  .~.~.~.~ Manually operated {2}
67.2.~.~.~.~.~ By use of screw

DEFINITION

Classification: 182/67.2

By use of screw:

(under subclass 67.1) Device wherein the ladder is extended by manually rotating a threaded shaft within a threaded sleeve.