US PATENT SUBCLASS 187 / 254
.~.~ And rotatably driven drum pulling thereon

Current as of: June, 1999
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187 /   HD   ELEVATOR, INDUSTRIAL LIFT TRUCK, OR STATIONARY LIFT FOR VEHICLE

250  DF  HAVING SPECIFIC LOAD SUPPORT DRIVE-MEANS OR ITS CONTROL {6}
251  DF  .~ Includes linking support cable (e.g., rope, chain) in drive-means {2}
254.~.~ And rotatably driven drum pulling thereon {6}
255  DF  .~.~.~> With projections or apertures for engaging complementary formations on cable (e.g., sprocket)
256  DF  .~.~.~> Plural driven drums {4}
261  DF  .~.~.~> Cable accumulating-type drum {1}
263  DF  .~.~.~> With structure adapting drum for manual drive
264  DF  .~.~.~> With separate biasing means maintaining cable tension {1}
266  DF  .~.~.~> Having cable guiding pulley wheel spaced therefrom

DEFINITION

Classification: 187/254

And rotatably driven drum pulling thereon:

(under subclass 251) Drive-means* also including a drum turned about its central axis by the source of power and having a perimeter which contacts the cable* and either winds a segment of cable* around its perimeter, or otherwise engages and pulls on a segment of the cable*, to apply a pulling force on the load-underlying support surface of the elevator.

(1) Note. The term "drum" is used in this and the indented subclasses to designate a rotatable structure (e.g., capstan, driven pulley, driven sprocket wheel, winding drum, windless, etc.) which is caused to turn about its axis of rotation by the source of power (e.g., motor).

SEE OR SEARCH CLASS

254, Implements or Apparatus for Applying Pushing or Pulling Force,

266+, for a rotatably driven drum pulling on a load hoisting cable.