Rotary cutter drill bit with permanent snap ring cutter retentio

Details Rotary cutter drill bit with permanent snap ring cutter retentio Rotary cutter drill bit with permanent snap ring cutter retentio

1984-01-06

1985-04-16

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 96, E21B 1008

Patent

active

045110085

ABSTRACT:
Structure for permanently retaining a rolling cutter on a journal pin of a rotary cutter earth boring bit is shown. The structure is defined by opposed, axially aligned, circumferential grooves formed in the mating bearing surfaces of the pin and the assembled cutter. The cutter groove is a single width throughout whereas the pin groove defines a double width for an arcuate extent thereof on its unloaded side. A split snap ring is compressed within the pin groove, with the ends of the ring axially overlapping in the double width portion so that the ring does not extend above the surface of the pin. Upon alignment of the grooves, during assembly of the cutter on the pin, the ring snaps into the cutter groove with the ends in abutting relationship and extends radially into the pin groove to retain the cutter on the pin. The single width groove in the cutter prevents the ring ends from ever again assuming an axially overlapped cutter-release condition thereby providing permanent retention of the cutter on the pin.

REFERENCES:
patent: 1847981 (1932-03-01), Reed
patent: 4157122 (1979-06-01), Morris
patent: 4444518 (1984-04-01), Schramm et al.

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