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US 4,445,580 AGranted
Deep hole rock drill bit
AssigneeSyndrill Carbide Diamond Company
InventorLloyd W. Sahley
Life of this patent
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AssigneeSyndrill Carbide Diamond Company
InventorLloyd W. Sahley
Estimating the term…
Rock drill bit having shaving cutters on the leading end of a removable bit head for shaving the hole bottom and shaving reamer cutters extending lengthwise of the bit. The cutters and receiving slots therefor have dovetail configurations for trapping the cutters in the slots. Wedges for locating the cutters are disposed in the bottoms of the slots. Lateral passages communicate with a central mud passage to deliver mud fluid to ports between the cutters. The central mud passage has a venturi configuration and lengthwise extending passages in the bit extend downwardly from upstream of the venturi to intersect or communicate with the lateral passages. A core shaver is mounted by a collet chuck in the central passage close to its outlet to the leading end of the bit to shave a core formed on the hole bottom between the inner ends of the shaving cutters on the end face.
A rock drill bit rotatable about an axis for drilling a hole, said bit having a central passage therethrough and a leading end, a plurality of dovetail configured slots opening into said leading end, and said slots being arranged angularly about said central passage and extending laterally from said central passage to the outer periphery of the bit, a plurality of first cutters with a dovetail configuration disposed in said slots with each projecting outwardly of said bit in a generally axial direction to a shaving edge extending radially of said axis for shaving rock from the hole bottom on rotation of said drill bit, the cutters and their shaving edges extending from said passage laterally to the outer periphery of said bit and outwardly thereof, each of said slots having wedging means received in the bottom of the slot for wedging the cutter therein to trap the dovetail configuration of the cutter between the bottom of the slot and the dovetail configuration of the slot to securely lock the cutter in the slot during operation of the bit.
A rock drill bit having a body rotatable about an axis for drilling a hole, said body having a leading end with an end face, a plurality of elongated first cutter bars having substantially planar bottom sides mounted on the leading end of the body to extend outwardly of the leading end face for operating on the bottom of the hole, a plurality of slots opening into the leading end face and having side walls which converge toward the leading end face of the bit for receiving and supporting said cutter bars, said cutter bars and slots being arranged angularly about said axis and said slots extending laterally thereof to open into the outer periphery of the body to provide for insertion of said cutter bars into the slots, said cutter bars being configured to provide side walls converging in a manner corresponding to the convergence of the side walls of the slots with the cutter bars projecting outwardly of the leading end face of said bit and having leading severing faces terminating in edges along lines extending crosswise of said axis for drilling against the hole bottom, said slots having wedge members disposed therein and movable into and out of said slots through the openings of the slots into the outer periphery of the body, said wedge members having surfaces cooperating with the bottoms of the slots and the bottoms of the cutter bars in the slots to wedge the cutter bars outwardly of the slots to trap the cutter bars between the bottoms of the slots and the converging side walls of the slots to hold the cutter bars in the slots during operation of the bit.
A rock drill bit rotatable about an axis for drilling a hole comprising means on the leading end of the bit for drillng against the hole bottom and forming a core as the drilling proceeds, a core shaver having radially extending shaving edges for engaging said core mounted on the axis of said bit at the leading end thereof for shaving the top of the core on rotation of the bit, a central passage opening into the leading end face of the bit for delivering drilling mud to the bottom of the hole, said core shaver being mounted in said central passage and projecting into an enlarged portion of said central passage for receiving the core, a collet chuck for receiving and holding said core shaver in said central passageway, the diameter of said central passage downstream of said chuck being smaller than the diameter of the downstream end of said collet chuck.
A rock drill bit rotatable about an axis for drilling a hole, said drill bit having a central passage for delivering drilling mud to the leading end of the bit, said central passage having a venturi configuration with a venturi throat area, a plurality of mud ports opening into the outer periphery of the bit, said ports being spaced angularly about the bit and lengthwise of the bit, lateral passageways extending downwardly from said mud port to open into said central passage with said lateral passageways comprising a group of lateral passageways intersecting said central passage adjacent the throat of said venturi.
A rock drill bit rotatable about an axis for drilling through geological formations comprising a body having a cylindrical configuration for substantially the full length of the bit, a first end portion to be connected to a drill string and a second end portion which leads the bit on drilling, said second end portion having a leading end face, said body having a plurality of reamer cutter bar slots in its outer periphery arranged angularly about the bit axis and extending generally parallel thereto and reamer cutter bars wedged in said slots for working on the wall of the drill hole for substantially the full length of the cylindrical configuration of said body, said body having a central passage for delivering drilling mud to the leading end face of the bit, and drilling mud ports between adjacent ones of said reamer cutter bars communicating with said central passage, bottom cutter elements for operating on the bottom of the hole being mounted on the leading end of said body, said bottom cutter elements having cutting edges arranged along lines extending crosswise of said axis and being arranged angularly about said axis.
A cutter bar for a rock drill bit and adapted to work on the bottom of a drill hole, said cutter bar having a bottom side, opposed sides converging toward each other from said bottom side, a relief side opposed to said bottom side and extending between said converging sides, one of said converging sides forming a leading severing face for the cutter bar and said relief side extending at a relief angle from the severing face, said cutter bar having a first severing edge along a straight line at the intersection of said leading severing side and said relief side and said cutter bar terminating in opposed end sides with one of said end sides and said leading severing side having a severing second edge along the line of the intersection of the sides for shaving a hole formation extending axially of the hole.
Dependencies are inferred from the claim text.