US PATENT SUBCLASS 198 / 332
.~.~ With paired track step levelers

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  DF  .~ By stairway having steps forming an endless member {6}
332.~.~ With paired track step levelers

DEFINITION

Classification: 198/332

(under subclass 326) Device wherein the section is provided with two guide rail means which simultaneously coact with followers carried by each step to maintain the tread portion of the step in a horizontal attitude as it moves through that portion of its path which constitutes the flight of stairs.