US PATENT SUBCLASS 212 / 255
HAVING VERTICALLY SWINGING BOOM

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

255HAVING VERTICALLY SWINGING BOOM {6}
256  DF  .~> And compensating means to maintain horizontal movement of load
257  DF  .~> And trolley
258  DF  .~> Protruding laterally from vehicle
259  DF  .~> Having specific engager for load
260  DF  .~> Having means to swing boom vertically {2}
264  DF  .~> Extensible by movement of boom or boom segment along longitudinal axis thereof

DEFINITION

Classification: 212/255

HAVING VERTICALLY SWINGING BOOM:

(under the class definition) Apparatus comprising an elongated member pivoted for movement about a horizontal axis to a mast, crane body, trolley*, or other supporting structure and projecting therefrom to support or guide a flexible member from which the load is suspended.

SEE OR SEARCH THIS CLASS, SUBCLASS:

232+, for a vertically swinging boom which is additionally mounted for horizontal movement.

299, for apparatus provided with specific means which allows the boom to collapse to a position for transport or storage.

317, for a bridge-mounted trolley having a vertically swinging boom thereon.

SEE OR SEARCH CLASS

114, Ships,

373+, for similar devices for raising and lowering boats. 414, Material or Article Handling,

680+, for residual vertically swinging load supports.