Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Patent
1976-05-04
1978-08-15
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Noncutting portion forwardly of cutting portion
175410, E21B 922
Patent
active
041065786
ABSTRACT:
A rotary air percussion drill bit which has a cylindrical body portion with first and second ends. A flat bottom face comprises one end with a shaft attached to the remaining end. A plurality of hard inserts is mounted in the body portion and projects downwardly from both the body portion and from the flat bottom face. The rotary air percussion drill bit has a first chip clearance means formed into the body portion longitudinally along its side wall with a second chip clearance formed around the side wall intermediate the first and second ends. The improvement in the rotary air percussion drill bit provides for a vertical slot which cuts through the drill base down the drill body and forms an arcuate terminus tapered to the cylindrical wall to the drill bit. A gauge tooth is mounted in the arcuate terminus at approximately 20.degree. to 35.degree. with a line normal to the axis of the drill bit. An additional improvement comprises an obtuse angle chip clearance storage region which is disposed between the first and second set of gauge teeth and is formed by a deep cut into the side of the drill bit and around the periphery of the drill bit. The side walls of the cut form an obtuse angle having a short side facing downwardly toward the flat face of the drill bit and a long side tapering up toward the first set of gauge teeth. A second set of gauge teeth is mounted around the short side of the chip clearance storage region. Opposite the short side is a second beveled edge which provides additional chip clearance. Both beveled edges protect the body of the drill against wear, thereby providing longer support to the carbide or hard inserts and extending thereby the life of the drill bit.
REFERENCES:
patent: 2958513 (1960-11-01), Bennett
patent: 3071201 (1963-01-01), Phipps
patent: 3346060 (1967-10-01), Beyer
patent: 3915246 (1975-10-01), Sheshtawy
Favreau Richard E.
Purser Ernest R.
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