Title: Sealing ring for drilling tool cutters

Abstract: An earth boring tool having journals with rotary cone cutters thereon wherein an internal lubricant exerts pressure on one side of the sealing means and pressurized drilling mud exerts external pressure against outwardly accessible portions of the sealing means, the sealing means having sealing contact with the journal leg or support axially of the journal and also with the rotary cone cutter radially of the journal and the cutter, and the sealing means being constructed and arranged to maintain sealing engagement with one of the journal leg and cutter as the cutter tilts relative to the axis of the journal in the normal operation of the earth boring tool.

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Inventors: Oldham, Joel S. (San Juan Capistrano, CA, US)
Landerville, Timothy L. (Lomita, CA, US)

Application Number: 901148
Filing Date: 1978-04-28
Publication_date: 1980-04-22
Assignee: Smith International, Inc. (Newport Beach, CA)
Primary Class(es): 175/371 277/336, 277/379, 277/380, 277/399, 277/910, 384/94
Other Classes:
US Patent Ref:

2744774	May, 1956	Wist	277/96.
2916332	Dec, 1959	Paulecka	277/96.
3529840	Sep, 1970	Durham et al.	277/92.
3761145	Sep, 1973	Schumacher	277/92.
3827701	Aug, 1974	Sakamaki	277/81.
3913988	Oct, 1975	Scales	308/8.
4068708	Jan, 1978	Sakaki	277/92.

Other Refs:
Primary Examiner: Smith, Robert I.
Assistant Examiner:
Attorney: