Drill rod and drill bit with rocking connection

Details Drill rod and drill bit with rocking connection Drill rod and drill bit with rocking connection

1995-11-01

1997-11-11

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175414, E21B 1014

Patent

active

056853815

ABSTRACT:
A drill bit is fictionally received over a drill rod via complementary generally frusto-conical male formation and socket. The socket has an inwardly protruding face at an angle with the longitudinal axis of the drill rod. The male formation on the drill rod has a depression in the form of an area where the convexity of the frusto-conical portion has been flattened at an angle so as to form a rocking formation at a selective location relative to the opposite ends of the male formation and the socket. A clearance space diverges away from the rocking formation toward a selective ends of the male formation and the socket. The frusto-conical male formation and the socket are a-circular and form positive driving engagement between the drill rod and the drill bit. An impact at the point of maximum clearance causes rocking about the rocking formation to break static friction and to facilitate release of the drill bit from the drill rod.

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