Rotary drill bit

Details Rotary drill bit Rotary drill bit

2006-04-18

2006-04-18

Gay, Jennifer H. (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S334000, C175S395000, C175S403000, C299S041100, C408S202000, C408S24100G, C404S075000, C404S090000

Reexamination Certificate

active

07028790

ABSTRACT:
A drill bit includes a body defining an axis and first and second cylindrical portions, a coupling adapted for connection with a rotary driver, and a depth stop adjustably secured to a first portion by a plurality of adjusting fasteners in a manner to limit penetration of the bit into a target surface. A method of drilling a hole into the surface includes locating a drilling machine fitted with a drill bit over a target location, compensating for wear on the bit by setting a depth stop to limit travel of the bit at the predetermined depth, drilling at the target location until the depth stop contacts a surface, where the primary cutting surface forms a portion of the hole defined by a first diameter and the secondary cutting surface forms a portion of the hole defined by a second diameter in a single step, and removing the drill bit from the hole.

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