US PATENT SUBCLASS 212 / 199
HAVING BOOM SHIFTABLE VERTICALLY ALONG A LINEAR PATH

Current as of: June, 1999
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212 /   HD   TRAVERSING HOISTS

199HAVING BOOM SHIFTABLE VERTICALLY ALONG A LINEAR PATH {5}
200  DF  .~> Movable along nonvertical rectilinear path
201  DF  .~> Length of hoisting cable between boom and load decreases automatically as boom is raised
202  DF  .~> Vertically spaced fastening means along boom support
203  DF  .~> Fluid actuated
204  DF  .~> By mounting on vertically extensible support

DEFINITION

Classification: 212/199

HAVING BOOM SHIFTABLE VERTICALLY ALONG A LINEAR PATH:

(under the class definition) Apparatus Including a boom* and structure supporting the boom which permits up or down translational movement of the entire boom along a rectilinear path.

(1) Note. A boom movable along its longitudinal axis to change its effective length (i.e., moment arm) is not considered to be a vertically shifting boom on that basis alone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

176+, for booms which are moved vertically on a support comprised of longitudinal sections connected end-to-end.

179, for hoists which are moved vertically by selective assembly of the hoist at different heights on a separate structure (e.g., building, pole, etc.).

230+, for a horizontally swinging boom which is movable along its longitudinal axis relative to a support to increase its effective length.

295+, for a vertically extending boom support which is collapsed into a transport or nonuse position. 314, for a vertically shiftable traveling bridge*.

SEE OR SEARCH CLASS

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

385+, for other vertically adjustable derricks which have no means for traversing the load.