Rotary percussion earth boring bit

Details Rotary percussion earth boring bit Rotary percussion earth boring bit

1976-08-30

1977-07-12

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175390, 175417, E21C 1306

Patent

active

RE0293008

ABSTRACT:
Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to extend cutting insert life and reduce cutting insert breakage. The bottom surface contains a flat transverse face with a bevelled edge. Two rows of circumferentially spaced cutting inserts protrude from the bevel. One of the rows is spaced inwardly from an outer row to define an inner row, which has inserts positioned between the circumferentially spaced inserts of the outer row. The longitudinal axes of these inserts are substantially perpendicular to the bevel and inclined outward at an acute angle to the axis of rotation of the bit. A generally longitudinally extending groove is formed between each two adjacent inserts of the outer row. This arrangement produces a symmetry that tends to minimize the number of reflective surfaces. This equalizes the stresses generated by the impact induced shock waves transmitted through the bit.

REFERENCES:
patent: 3158216 (1964-11-01), Baron et al.
patent: 3185228 (1965-05-01), Kelly, Jr.
patent: 3269470 (1966-08-01), Kelly, Jr.
patent: 3357507 (1967-12-01), Stewart
patent: 3388756 (1968-06-01), Varel et al.
patent: 3537538 (1970-11-01), Adcock
patent: 3583504 (1971-06-01), Aalund
patent: 3717209 (1973-02-01), Sheldon
patent: 3858671 (1975-01-01), Kita

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