Apparatus for making and breaking joints in drill pipe strings
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United States of America Patent
Stats
-
Feb 7, 1995
Grant Date -
N/A
app pub date -
May 26, 1993
filing date -
May 26, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus for making and breaking joints in drill pipe strings has three jaws each of which is adjustable to an infinite number of settings. The jaw-adjustment means are symmetrical about a central plane, and incorporate a spherical section. Different portions of the spherical section operate relative to closing and self-energizing of each jaw, the particular operative portion depending upon the exact set or adjusted position of the jaw. Each jaw is constructed for stable clamping of a drill type portion, with only one side of each jaw having a die element that is rotatably mounted. The jaw-adjustment mechanism effects both opening and closing of the jaw, there being no necessity to manually pull on a jaw portion at any time.
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Family
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Cited Art Landscape
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