US PATENT SUBCLASS 198 / 326
.~ By stairway having steps forming an endless member

Current as of: June, 1999
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198 /   HD   CONVEYORS: POWER-DRIVEN

321  DF  CONVEYOR OR ACCESSORY THEREFOR SPECIALIZED TO CONVEY PEOPLE {5}
326.~ By stairway having steps forming an endless member {6}
327  DF  .~.~> Having hinged plates forming steps
328  DF  .~.~> Trained about vertical axis or axes
329  DF  .~.~> With means allowing tensioning of the endless member
330  DF  .~.~> With drive means {1}
332  DF  .~.~> With paired track step levelers
333  DF  .~.~> With specified step structure

DEFINITION

Classification: 198/326

(under subclass 321) Device wherein the section includes a continuous train of moving tread members which are either attached one to the other so as to form a closed loop or are mounted to an interminable belt-like member and which form a moving flight of stairs as they are moved along an inclined surface.