Wells – With junk retrieving means
Reexamination Certificate
2006-10-10
2006-10-10
Bates, Zakiya W. (Department: 3676)
Wells
With junk retrieving means
C175S246000, C175S309000
Reexamination Certificate
active
07117939
ABSTRACT:
A bit retention apparatus for the use of retrieving the hammer bit in cases of shankage. The apparatus incorporates a dual sleeve design that fits over the chuck and the extended head section of the hammer bit. The first, “inner” sleeve has two or more ring pieces that fit onto the chuck and have the retention ring fitted into the lower section of the sleeve. The second, “outer” sleeve fits onto the chuck over the inner sleeve to provide protect to the inner sleeve while pulling the shanked bit out of the well bore. Attachment to the bit is accomplished by collars, knobs, or threads on the interior of the sleeves that correspond with holding bands, retention rings, or threads on the bit and chuck.
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patent: WO 98/05476 (1998-02-01), None
Hawley Gregory Dee
Meyers John Adam
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