Drill bit assembly

Details Drill bit assembly Drill bit assembly

2007-03-06

2007-03-06

Neuder, William P. (Department: 3672)

Boring or penetrating the earth

Processes

C175S171000, C175S415000

Reexamination Certificate

active

10912432

ABSTRACT:
A drilling apparatus comprises a casing shoe, ring bit, and center bit. The casing shoe may be connected to a casing received within the casing shoe. The ring bit is received within the casing shoe and retained at the end of the casing. The ring bit rotates relative to the casing shoe, and drills a peripheral portion of a hole. The center bit drills a central portion of the hole, and may be rotated and percussively driven to drill the hole. The center and ring bits are adapted for: engaging one another so that rotating and percussively driving the center bit also rotates and percussively drives the ring bit; engaging one another so that retracting the center bit also retracts the ring bit, casing shoe, and casing; enabling disengagement from one another and withdrawal of the center bit from the ring bit and the casing shoe.

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patent: 2006/0081403 (2006-04-01), Mattila
patent: 9-310576 (1997-12-01), None
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