US PATENT SUBCLASS 414 / 22.56
.~.~.~.~ Pivoting derrick

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  DF  .~.~.~ Boom pivoting about horizontal axis {1}
22.56.~.~.~.~ Pivoting derrick

DEFINITION

Classification: 414/22.56

Pivoting derrick:

(under subclass 22.55) Apparatus including a support structure which is intended to support the cylindrical member in a well, wherein the entire support structure is moved about an axis extending in the horizontal direction to move the member from the level to the vertical position or vice versa.