Gage row structure of an earth boring drill bit

Details Gage row structure of an earth boring drill bit Gage row structure of an earth boring drill bit

1980-06-23

1982-08-10

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175410, E21B 1052

Patent

active

043433723

ABSTRACT:
An earth boring drill bit has staggered rows of wear resistant inserts that are positioned to provide more inserts in the rows without sacrificing insert supporting metal. The staggered rows include a first or heel row of inserts that is positioned next to the gage surface of the cutter. The second or adjacent row is located farther from the gage surface and staggered with the first row so that the first and second row inserts alternate in contacting the bottom of the borehole. Each insert has a centerline that intersects the cutter axis. The first row inserts intersect the cutter axis at a greater angle than the second row inserts. This positioning results in a more uniform section of metal between the holes of the first and second row inserts, enabling a closer spacing.

REFERENCES:
patent: 2990025 (1961-06-01), Talbert et al.
patent: 3126067 (1964-03-01), Schumacher
patent: 4056153 (1977-11-01), Miglierini

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