Metal working – Means to assemble or disassemble – By deforming
Patent
1981-04-24
1986-12-02
Schmidt, Frederick R.
Metal working
Means to assemble or disassemble
By deforming
166 85, 294 861, E21B 1712
Patent
active
046253815
ABSTRACT:
An apparatus which provides for a sub-body having a mandrel with a longitudinal bore therethrough having a rigidly attached upper collar section for engagement onto a section of pipe or the like, and having a threadably removable lower collar section for threadably engaging the end of a second lower section of drill pipe. Insertable onto the mandrel or body section of the sub-unit is a retriever section, which is substantially circular in nature and slidably movable between the end collars of the sub-unit. The retriever section is adapted with protruding members, radially around its exterior most vertical wall for engaging with an extended J-slot of a wear bushing following the lowering of the retrieving unit into the bushing. Also provided is a pair grooved sections running substantially the length of the mandrel section of the sub-unit on both sides of the mandrel, wherein a intruding member on the retriever unit may move along the vertical body, but is disallowed for rotational movement thereupon. An alternate embodiment would include exterior threads for threadably engaging the wear bushing to be retrieved.
REFERENCES:
patent: 1128634 (1915-02-01), Talbot
patent: 1873294 (1932-08-01), Cosgrove
patent: 2339258 (1944-01-01), Engh
patent: 2506795 (1950-05-01), Koeln
patent: 2662276 (1950-03-01), Sheaffer
patent: 3489214 (1970-01-01), Phipps et al.
Gravouia, Jr. Francis
Hebert Henry
Schad Steven P.
Schmidt Frederick R.
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