US PATENT SUBCLASS 182 / 2.7
.~.~ Parallelogram linkage

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

2.1  DF  MEANS MAINTAINING PLATFORM LEVEL ON ANGULARLY MOVABLE SUPPORT {2}
2.3  DF  .~ Swingable support {6}
2.7.~.~ Parallelogram linkage

DEFINITION

Classification: 182/2.7

Parallelogram linkage:

(under subclass 2.3) Device wherein the swingable support comprises a parallel motion linkage which has a pair of substantially parallel lifting arms.