Boring or penetrating the earth – Tool removable or insertable through or around driving or...
Reexamination Certificate
2007-02-27
2007-02-27
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Tool removable or insertable through or around driving or...
C175S171000, C175S385000, C175S386000
Reexamination Certificate
active
10459465
ABSTRACT:
The present invention provides a global drilling system comprising a crown bit, a driver drill bit and a square drill bit. The crown bit has a tubular body with an inner surface and an outer surface, wherein the inner surface circumscribes a hollow passageway, and a pair of projections extending into said hollow passageway. The pair of projections are positioned substantially opposite one another on said inner surface. The driver drill bit has a drilling head with a pair of cut-away portions positioned substantially opposite one another and a pair of locking surfaces adapted for engaging the projections on the crown bit. The square drill bit has a drilling head with two tapered cut-away portions positioned substantially opposite one another. Each cut-away portion corresponds to one of the pair of projections such that the drilling head is able to pass through the hollow passageway of the crown bit.
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Concentrix Overburden Drilling System.
Outils de forage Sandvik Coromant TUBEX.
Centrex.
Stratex Drill Systems.
Symmetrix For drilling of tube umbrella.
Charland Luc
Charland Roger
Bagnell David
Collins Giovanna M
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