Powered milling clamp for drill pipe
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United States of America Patent
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Jun 12, 2018
Issued Date -
Sep 10, 2015
app pub date -
Mar 10, 2015
filing date -
Mar 10, 2014
priority date (Note) -
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Abstract
A powered clamp for transmitting torque to a drill pipe comprises an outer housing disposed around an axial central passage and connected to a plurality of carrier guides defining a plurality of radial slots. An inner housing defines a coaxial central passage, is rotatably connected to the outer housing, and defines a plurality of actuator slots having a spiral configuration relative to the centerline axis. A carrier is slidably disposed in each slot between the carrier guides and has a carrier pin extending into a respective one of the actuator slots. At least one powered linear actuator is connected between the outer and inner housing to selectively rotate the housings relative to one another. This rotation causes the carriers to move radially inward and outward as the carrier pins travel along the actuator slots, selectively gripping and releasing the drill pipe.
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