Blasthole drill with improved automatic breakout wrench

Details Blasthole drill with improved automatic breakout wrench Blasthole drill with improved automatic breakout wrench

E - Fixed Constructions

21

B

E21B 19/16 (2006.01)

Patent

CA 2154213

An automatic breakout wrench with: the clamping jaw located on the inside of the pipe so that the clamping grip is not reduced by the force of the breakout cylinder; the orientation of the breakout cylinder resulting in the breakout cylinder creating a moment that forces the wrench toward the pipe rather than away from the pipe; pivotal movement of the wrench member guided by three pins; the wrench member pivoting twenty-four degrees; the clamping jaw pivotally mounted on one of the pins guiding movement of the wrench member; and shims secured in a manner so as to be easily inserted and removed.

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