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AssigneeKennametal South Africa (Proprietary) Limited
InventorsStephanus Frederick Kloppers, Jean Frederick Kloppers
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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.
A combination of a drill rod and a drill bit comprising:
A combination of a drill rod and a drill bit comprising:
A method of releasing a drill bit received over an end of a drill rod in which the drill rod has a generally frusto-conical male end formation and the drill bit has a complementary generally frusto-conical socket formation;
Dependencies are inferred from the claim text.