Percussion drill bit

Details Percussion drill bit Percussion drill bit

1976-04-23

1977-10-04

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175415, 175418, 299 10, E21C 1300

Patent

active

040519120

ABSTRACT:
A percussion drill bit has an anvil portion and a removable head porton incorporating cutting inserts arranged in circumferentially-spaced groups separated by fluid flow passageways, at least some of the inserts being arranged at axial and radial positions with respect to the drill axis so that during working operation these inserts penetrate the formation being drilled by generally equal amounts and are thus subject to generally the same loading. The removable head portion is retained on the anvil portion of the bit by a splined and threaded lock nut arranged so that the threads are not subjected to cyclical fatigue loading due to operation of the percussion force generating tool.

REFERENCES:
patent: 2371490 (1945-03-01), Williams, Jr.
patent: 2998088 (1961-08-01), Pennington
patent: 3346060 (1967-10-01), Beyer
patent: 3357507 (1967-12-01), Stewart
patent: 3536150 (1970-10-01), Stebley
patent: 3640355 (1972-02-01), Lebourg
patent: 3752534 (1973-08-01), Rollins et al.

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