Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2004-08-16
2008-12-09
Bomar, Shane (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S359000, C277S589000, C277S407000, C277S377000
Reexamination Certificate
active
07461708
ABSTRACT:
A drill bit and seal assembly therefor include a seal gland, an elastomeric sealing seal disposed in the seal gland and having a dynamic sealing surface and a static sealing surface, and at least one auxiliary elastomeric annular seal member disposed between the static sealing surface of the sealing seal and the seal gland. The auxiliary annular seal member serves to prevent relative movement of the sealing seal relative to the surfaces of the seal gland and to permit sealing seals of various cross-sections and shapes to adapt to and function with a conventionally sized and shaped gland. The auxiliary annular seal member is sized and configured and its material properties selected so as to impart the appropriate squeeze to the sealing seal to provide the desired contact pressure and footprint. Choice of the appropriate auxiliary seal member may permit the same sized seal to be employed in seal glands of differing sizes.
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British Search Report for Appln. No. GB0516356.3 dated May 18, 2006; (pp. 3).
Chellappa Sudarsanam
Yong Zhou
Bomar Shane
Conley & Rose, P.C.
Smith International Inc.
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