US PATENT SUBCLASS 212 / 264
.~ Extensible by movement of boom or boom segment along longitudinal axis thereof


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

255  DF  HAVING VERTICALLY SWINGING BOOM {6}
264.~ Extensible by movement of boom or boom segment along longitudinal axis thereof


DEFINITION

Classification: 212/264

Extensible by movement of boom or boom segment along longitudinal axis thereof:

(under subclass 255) Apparatus including a vertically swinging boom* and wherein either (a) means are provided which permits translational movement of the boom along its longitudinal axis and relative to the boom-supporting structure, or (b) the boom consists of a plurality of interconnected segments slidably related to one another whereby the effective length of the boom may be change.

SEE OR SEARCH THIS CLASS, SUBCLASS:

231, for a horizontally and vertically swinging extensible

boom.

299+, for booms collapsible for transport or storage.

348+, for extensible boom structure, per se.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings), 111+, for other extensible shaft structure.