Patent ID: 6298926
Filing Date: 2001-10-09
Classification: E21B

Abstract:
A blasthole drill comprising:a frame supported for movement over a ground surface, said frame including a drill deck having an opening;a mast supported by said frame;a drill pipe which is supported relative to said mast and which extends through said opening, said drill pipe having a longitudinal axis and further having an engagement surface; wherein said drill pipe engagement surface has two portions, one on each side of said drill pipe, wherein said drill pipe engagement surface portions are substantially flat, and substantially parallel to each other and to said longitudinal axis,a rotary head movable along said mast for rotating and longitudinally moving said drill pipe; anda deck wrench mounted on said drill deck, said deck wrench having an engagement surface which is selectively engageable with said drill pipe engagement surface to substantially prevent rotation of said drill pipe in either direction about said longitudinal axis, wherein said deck wrench engagement surface has two opposite facing portions.