Method of securing a rotary cutter to a body of a down hole...

Details Method of securing a rotary cutter to a body of a down hole... Method of securing a rotary cutter to a body of a down hole...

2007-12-18

2007-12-18

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S347000

Reexamination Certificate

active

11230362

ABSTRACT:
A rotary cutter assembly constructed in accordance with this method of securing a rotary cutter to a body has a cutter pocket with a first shoulder and a truncated second shoulder. A receptacle extends into the first shoulder. A first retainer retains a first axle end of the rotary cutter and engages the first shoulder to prevent axial movement in a first direction. A projection on the first retainer engages the receptacle to prevent removal of the first retainer radially from the cutter pocket. A second retainer retains a second axle end of the rotary cutter. The second retainer has a step down portion engaging the truncated second shoulder of the cutter pocket to prevent axial movement in a second direction. A locking ring overlies the truncated second shoulder and the step down portion of the second retainer to prevent removal of the second retainer radially from the cutter pocket.

REFERENCES:
patent: 2189034 (1940-02-01), Harrington
patent: 4548284 (1985-10-01), Shinn et al.
patent: 6213229 (2001-04-01), Majkovic
patent: 2461082 (2005-09-01), None
Sii Smith Services, ‘Reamer—Drilling on Gauge (DOG®) Sub’, available at http://www.siismithservices.com/b—products/product—page.asp?ID=30, at least as early as 2001.

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