Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2005-02-22
2005-02-22
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S378000, C175S351000
Reexamination Certificate
active
06857488
ABSTRACT:
A tunnel boring including a rotatable head is disclosed. The head has a cutting face transverse to a head axis of rotation. A plurality of cutters are mounted in the face each on an associated one of a plurality of hubs. The hubs mounted for rotation about a respective hub axes. Each such respective hub axis is in an imaginary plane intersecting another imaginary plane including the head axis. Each of the cutters has a cutting edge symmetrical about another imaginary plane which is skewed with respect to the respective hub axis of the associated hub.
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Pastor Robert X.
Tsay Frank
Watts Hoffmann Co. LPA
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