Partially enhanced percussive drill bit

Details Partially enhanced percussive drill bit Partially enhanced percussive drill bit

1999-02-18

2000-08-22

Bagnell, David

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

1754202, 175418, 299100, E21B 1036, E21C 2510

Patent

active

061056936

ABSTRACT:
The present invention relates to a partially enhanced drill bit (10') for percussive drilling. The bit comprises a bit body, at least one annular row of non-enhanced buttons (11') mounted in the bit body; and at least one annular row of enhanced buttons (12') mounted in the bit body radially outside of the non-enhanced buttons. At least one annular row of non-enhanced buttons (11') and said at least one annular row of enhanced buttons (12') are provided to partly overlap each other. There is an axial shoulder (19') radially outside of the non-enhanced buttons (11'). There are chamfers (20') at least partly surrounding the enhanced buttons (12'). These chamfers (20') interrupt the shoulder (19') in the circumferential direction.

REFERENCES:
patent: 3071201 (1963-01-01), Phipps
patent: 3388756 (1968-06-01), Varel et al.
patent: 3955635 (1976-05-01), Skidmore
patent: 5358063 (1994-10-01), Hedlund et al.
patent: 5794728 (1998-08-01), Palmberg
patent: 5890551 (1999-04-01), Liljebrand et al.

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