Tooth loading for earth boring bits

Details Tooth loading for earth boring bits Tooth loading for earth boring bits

1975-04-28

1976-07-20

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

403361, E21C 1300

Patent

active

039701581

ABSTRACT:
Deformable pads are inserted under the hard metal inserts used to form the earth removing teeth of an earth boring bit. The inserts are typically formed of sintered tungsten carbide, with a cylindrical body beveled at the lower end to facilitate insertion into an interferringly sized drilled hole. The volume of the deformable pad or plate is greater than the remaining voids between the hole, the plate and the assembled insert upon initial assembly. Repetitive loading of the insert during drilling deforms the plate to fill said space to evenly distribute stress between the insert and the wall of its retaining hole. A radius between the corner of the wall and bottom of the hole minimizes stress at this corner.

REFERENCES:
patent: 1428415 (1922-09-01), Brossoit
patent: 2101376 (1937-12-01), Voigtlander
patent: 2673716 (1954-03-01), Avery
patent: 3190380 (1965-06-01), Anderson
patent: 3239233 (1966-03-01), Stillwagon
patent: 3382940 (1968-05-01), Stebley
patent: 3618683 (1970-11-01), Hughes
patent: 3693736 (1972-09-01), Gardner
patent: 3791463 (1974-02-01), Pearson
patent: 3858671 (1975-01-01), Kita et al.

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