Drill bit for a rock drilling tool with increased toughness and method for increasing the toughness of such drill bits

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United States of America Patent

PATENT NO 9242336
APP PUB NO 20130183887A1
SERIAL NO

13788666

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Abstract

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Drill bit (10) for a rock drilling tool (12), and a method of increasing the toughness of the drill bit, which drill bit (10) has a drilling surface (10b) that contacts rock during drilling. A longitudinal cross section (10t) of the drill bit (10) through the drilling surface (10b) exhibits certain relationships of Ltot(depth)/Ltot(5.0) and H(depth)/H(5.0) at the specified depths, along the drill bit's longitudinal axial center line (C) if the drill bit has a length (L) of 10 mm or greater, and Ltot(depth)/Ltot(3.5) and H(depth)/H(3.5) at the specified depths, if the drill bit has a length (L) of 10 mm or less.

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Patent Owner(s)

Patent OwnerAddress
EPIROC DRILLING TOOLS AKTIEBOLAGBOX 521 FAGERSTA 737 25

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carlsson, Jimmy Fagersta, SE 5 10
Rehnstrom, Mattias Fagersta, SE 1 0
Stenberg, Goran Fagersta, SE 3 2

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