Earth boring bit
OwnerRobert W. Engstrominventor
Life of this patent
Estimating the term…
Abstract
The earth boring bit 10 is designed to bore an angular non-vertical hole into underlying strata. The bit 10 includes a plurality of steeply inclined cutting faces or edges 22 that define a relatively narrow included angle A therebetween. The bit's design ensures that the apex of the bit 10 will contact the surface S and/or other hard strata before the radially outwardly disposed gauge portion of the bit 10. This design reduces or obviates drill chattering or “walking” when the bit 10 is used to drill a hole at an angle that is not vertical relative to the surface or strata S. The bit 10 also includes an interchangeable flow control restrictor that optimizes the velocity of fluid pumped through the bit 10 and thus efficiently flushes debris from the hole as the hole is being drilled.
Claims19
An earth boring bit, comprising:
- a body having a drill stem attachment end and a working end opposite the attachment end, the body defining a fluid passage formed axially and substantially concentrically therethrough;
- a plurality of radially disposed cutting faces extending from the body;
- a working edge disposed along each of the cutting faces, the working edges collectively defining an included angle of up to ninety degrees;
- a plurality of cutting tooth sockets disposed along each of the working edges of the cutting faces, each of the cutting tooth sockets defining a cutting tooth angle relative to the cutting face to which the socket is attached;
- a cutting tooth removably installed within each of the cutting tooth sockets;
- and
- a selectively replaceable fluid control restrictor removably installed within the fluid passage.
An earth boring bit, comprising:
- a body having a drill stem attachment end and a working end opposite the attachment end;
- a plurality of radially disposed cutting faces extending from the body;
- a working edge disposed along each of the cutting faces, the working edges collectively defining an included angle of up to ninety degrees;
- a plurality of cutting tooth sockets disposed along each of the working edges of the cutting faces, each of the cutting tooth sockets defining a cutting tooth angle relative to the cutting face to which the socket is attached;
- and
- a cutting tooth removably installed within each of the cutting tooth sockets.
An earth boring bit, comprising:
- a body having a drill stem attachment end and a working end opposite the attachment end, the body defining a fluid passage formed axially and substantially concentrically therethrough;
- a selectively replaceable fluid control restrictor removably installed within the fluid passage;
- and
- a fluid control restrictor retainer, the restrictor retainer being an internal snap ring removably disposed within the flow control passage adjacent the flow control restrictor.
Dependencies are inferred from the claim text.