US PATENT SUBCLASS 212 / 231-- .~.~ And vertically swinging

US PATENT SUBCLASS 212 / 231
.~.~ And vertically swinging

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

223	DF	HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
230	DF	.~ Extensible by movement of boom or boom segment along longitudinal axis thereof {1}
231		.~.~ And vertically swinging

DEFINITION

Classification: 212/231

And vertically swinging:

(under subclass 230) Apparatus wherein the boom* is also capable of pivotal movement about a horizontal axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

168, for a boom extension which is employed to project a grab beyond the edge of the boom but is retracted before the load is lifted.

264, for an extensible boom claimed as being swingable only in a vertical plane.

296, for an extensible boom supporting tower which is pivoted vertically to a horizontal position for transportation but remains vertical during use.

300, for a vertically swinging boom having sections which are pivoted together for collapsing the boom to a transport or nonuse position.