Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2007-10-09
2007-10-09
Kreck, John (Department: 3673)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C299S110000
Reexamination Certificate
active
10540872
ABSTRACT:
A roller cutter includes a hub having crushing members mounted on an outer periphery thereof, and a shaft on which the hub is mounted for rotation. Opposite ends of the shaft include respective spigots. Seals are disposed adjacent respective ends of the shaft and are arranged radially between the shaft and the hub for preventing leakage of lubricant. Covers are disposed axially outwardly of respective seals for covering the respective seals. Each cover includes a generally radially inwardly directed projection received in an indentation formed in an outer surface of the shaft to lock the cover axially and rotationally with respect to the shaft.
REFERENCES:
patent: 2627431 (1953-02-01), Sechrist
patent: 3645591 (1972-02-01), Winberg
patent: 3752243 (1973-08-01), Hummer et al.
patent: 4448271 (1984-05-01), Persson
patent: 4509607 (1985-04-01), Saxman et al.
patent: 5295549 (1994-03-01), Dolezal et al.
patent: 5839523 (1998-11-01), Brolund
patent: 5961185 (1999-10-01), Friant et al.
patent: 5984024 (1999-11-01), Strand
patent: 08210071 (1996-08-01), None
Drinker Biddle & Reath LLP
Kreck John
Sandvik Intellectual Property AB
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