US PATENT SUBCLASS 414 / 22.67
.~.~.~ Pivotal 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}
22.63  DF  .~ Vertical rack {3}
22.65  DF  .~.~ Pivotal carriage {2}
22.67.~.~.~ Pivotal derrick

DEFINITION

Classification: 414/22.67

Pivotal derrick:

(under subclass 22.65) Apparatus wherein the means to move the cylindrical member comprises the main support assembly.

(1) Note. The apparatus of this subclass may comprise a derrick that pivots at the ground to move the pipe or rod, or one that pivots near its peak to effect such movement.