US PATENT SUBCLASS 414 / 22.55
.~.~.~ Boom pivoting about horizontal axis

Current as of: June, 1999
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414 /   HD   MATERIAL OR ARTICLE HANDLING

22.51  DF  WELL PIPE OR ROD RACKING MECHANISM {3}
22.52  DF  .~ With slope change {4}
22.54  DF  .~.~ Horizontal to/from vertical {3}
22.55.~.~.~ Boom pivoting about horizontal axis {1}
22.56  DF  .~.~.~.~> Pivoting derrick

DEFINITION

Classification: 414/22.55

Boom pivoting about horizontal axis:

(under subclass 22.54) Apparatus including structure engaging the cylindrical member and swinging therewith about an axis extending in the horizontal direction to move the member from the level to the vertical position or vice versa.