US PATENT SUBCLASS 198 / 327
.~.~ Having hinged plates forming steps

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}
327.~.~ Having hinged plates forming steps

DEFINITION

Classification: 198/327

(under subclass 326) Device wherein the endless member includes a plurality of pivotally connected tread and riser members which alternate one with the other and wherein the moving flight of stairs is formed by flexing the endless member to displace the risers to a vertical attitude and the treads to a substantially horizontal attitude.