| 摘要 |
An extraction tool, for aiding in the removal of a tubular piece that has been fitted or otherwise bonded in a fitting or second tubular piece, comprising a pair of cone-shaped expander heads threadably mounted on one end on a longitudinally extending rod in axial alignment therewith, at least two expanding jaw segments shaped to surround and bear down upon the expander heads, a finger nut attached to the other end of the rod for rotating same, and a handle. The outer faces of the jaw segments form parts of a generally cylindrical surface having teeth adapted to provide a gripping relation with an interior of a tubular piece when forced thereagainst. The threaded engagement between the rod and expander heads is such that rotating the rod will effect relative movement of the expander heads in an axial and opposite direction. Such movement of the expander heads produces uniform radial expansion of the jaw segments from the rod and into gripping relation with the interior of the tubular piece in which the extraction tool has been inserted. Once solidly gripped, heat may be applied to the fitting exterior, if necessary, and the tubular piece pulled free. Alternate embodiments include a reamer fitted to the rod and various types of gripping teeth on the outer surfaces of the jaw segments for improved gripping relation between the extraction tool and interior surfaces of tubular pieces.
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