Boring or penetrating the earth – Processes
Patent
1994-08-31
1996-05-07
Dang, Hoang C.
Boring or penetrating the earth
Processes
175337, 175339, 175371, E21B 1022
Patent
active
055137113
ABSTRACT:
A rotary cone drill bit (10) for forming a borehole includes a support arm-cutter assembly (26). A support arm (28) is integrally formed with the drill bit's body (22) with a spindle (30) machined integral thereto. The assembly (26) includes a cutter (12) with a cavity (34) for receiving the spindle (30). An inner seal gland (44) is formed between the spindle (30) and a wall (42) of the cavity (34). An elastomeric seal (46) is disposed in the inner seal gland (44) to form a first fluid barrier between. An outer seal gland (50) is formed between the spindle (30) and the cavity wall (42) and between the inner seal gland (44) and the borehole. A ring (56) is disposed in the outer seal gland (50) to rotate with the cutter (12). The ring (56) has a peripheral hole (58) therethrough. A gas conduit (60) is disposed within the support arm (28) for directing a flow of a gas, such as air, into the outer seal gland (50). From the outer seal gland (50), the gas is directed through the hole (58) in the ring (56) and exits into the borehole to form high velocity jets of air to dean a mating surface between the arm (28) and the cutter (12) preventing borehole debris from entering the inner seal gland (44).
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