Round/flat carbide seat

Details Round/flat carbide seat Round/flat carbide seat

1985-05-17

1987-04-28

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175413, E21B 1052

Patent

active

046606602

ABSTRACT:
A percussion drill having a rounded and tapered contact surface conformation between the inner ends of hardened insert members closely received by cavities in a drill bit. Each insert has a radiused inner end in contacting relation with the bottom wall of its associated cavity. The radius is such that it compensates for angular deviations in the cavity bottom wall due to manufacturing tolerances from a normal relation relative to the cavity longitudinal axis. The radius of the insert inner end is calculated on the basis of a mathematical formula. The arrangement provides a structure which prevents corner load and stress, and insures contact away from the corner to thereby increase bit life.

REFERENCES:
patent: 3389761 (1968-06-01), Ott
patent: 4047583 (1977-09-01), Dyer
patent: 4150728 (1979-04-01), Garner et al.
patent: 4176725 (1979-12-01), Shields
patent: 4289211 (1981-09-01), Lumen

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