E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 6/00 (2006.01) E21B 1/00 (2006.01) E21B 3/00 (2006.01)
Patent
CA 2150997
A blasthole drill comprising a mast supported for movement between a substantially vertical position and a non- vertical position, the mast defining a drill hole axis, a drill- through pipe rack mounted on the mast, the pipe rack including an upper arm having inner and outer ends, the inner end being connected to the mast for pivotal movement relative thereto, a lower arm having inner and outer ends, the inner end of the lower arm being connected to the mast for pivotal movement relative thereto about a generally horizontal inner axis, and a rack member having upper and lower ends and a longitudinal axis generally parallel to the drill hole axis, the upper end of the rack member being connected to the outer end of the upper arm for relative pivotal movement and the lower end of the rack member being connected to the outer end of the lower arm for relative pivotal movement about a generally horizontal outer axis, the upper and lower arms, the rack member and the mast defining a parallelogram structure such that the rack member is movable horizontally relative to the mast and between an extended position wherein a drill pipe supported by the gate is on the drill hole axis and a retracted position wherein the gate is spaced from a drill pipe on the drill hole axis, a mechanism for moving the upper and lower arms and the rack member so as to move the rack member between the extended and retracted positions, the lower arm extending generally horizontally when the rack member is in the extended position and the mast is in the vertical position and extending generally vertically when the rack member is in the retracted position and the mast is in the vertical position such that, when the mast is in the vertical position and the rack member moves from the extended position to the retracted position, the outer axis moves through a vertical plane including the inner axis, and a rotary head moveable relative to the mast along the drill hole axis, the rotary head being selectively engageable with the upper end of a drill pipe supported by the pipe rack when the rack member is in the extended position.
Harnischfeger Technologies Inc.
Ridout & Maybee Llp
LandOfFree
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