US PATENT SUBCLASS 212 / 223
HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE

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

223HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
224  DF  .~> Boom mounted for guided horizontal translation (e.g., trolley mounted)
225  DF  .~> Having trolley thereon {3}
230  DF  .~> Extensible by movement of boom or boom segment along longitudinal axis thereof {1}
232  DF  .~> And vertically swinging {6}
245  DF  .~> And means to swing boom horizontally {3}
250  DF  .~> Having fluid ram directly actuating load cable or sheave therefor
251  DF  .~> Having specific engager for load
252  DF  .~> Having passage for hoist cable through boom supporting member
253  DF  .~> Having specific bearing structure

DEFINITION

Classification: 212/223

HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE:

(under the class definition) Apparatus comprising a boom* or a bridge* which is mounted to a support for movement about a vertical axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

280, for means to stop the horizontal rotation of a boom as a result of its movement beyond a predetermined point or its

proximity to a powerline.

286, for apparatus including means to cyclically reverse the direction of boom rotation.

317, for a traveling bridge having a horizontally swinging boom.

347, for traversing hoist boom structure, per se.

SEE OR SEARCH CLASS 52, Static Structures (e.g., Buildings),

114, for miscellaneous elongated members which are moved about an axis normal to a supporting base by mechanical motive means. A horizontally rotatable boom is classified in Class 212 when disclosed as traversing hoist structure.

414, Material or Article Handling,

591, for a horizontally swinging boom from which is suspended a grab mounted for guided vertical movement; and subclass 744.1 for a horizontally swinging load support having no means to raise the load.