(under the class definition) Devices comprising a means located below ground level in a well conduit adapted to cause relative rotary motion between one section of conduit and another section of conduit also located in the well, said means including a means movable outwardly to engage the
surrounding well conduit section to prevent rotation of one portion of the rotating means in the well.
(1) Note. Generally one of the sections of conduit is a pipe which is stuck in the well bore and held against rotation and the below ground means is anchored to a separate outer well conduit and engages only the uppermost section of the stuck section in the manner of a fishing tool.
SEE OR SEARCH THIS CLASS, SUBCLASS:
98, for a grapple with a well anchored lifting means.
206+, and the search there noted, for expansible well anchors or casings.
SEE OR SEARCH CLASS 81, Tools,
436+, for tools which have a force-exerting portion inserted into a cavity in the work, especially subclasses 442+ for expanding type portions.
294, Handling: Hand and Hoist-Line Implements,
86.24+, for internally expanding well grapples, and subclasses 93+ for internally expanding grapples of general utility.
