Stripper rubber on a steel core with an integral sealing gasket

Details Stripper rubber on a steel core with an integral sealing gasket Stripper rubber on a steel core with an integral sealing gasket

2008-07-01

2008-07-01

Tsay, Frank S (Department: 3676)

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

Rotary drive for a relatively advancing tool

C166S058000, C166S081100

Reexamination Certificate

active

07392860

ABSTRACT:
An elongated stripper rubber having a converging internal passage extending to a neck portion elastically expanded to snugly receive a drill string. The elongated stripper rubber is adhered to a steel core having a truncated conical load bearing surface containing an annular gasket cavity containing a truncated conical gasket. The volume of elastic material protruding from the truncated conical load bearing surface can be compressed into the gasket cavity between the steel core and a truncated conical annulus in an outer housing.

REFERENCES:
patent: 3868832 (1975-03-01), Biffle
patent: 5062479 (1991-11-01), Bailey et al.
patent: 6016880 (2000-01-01), Hall et al.
patent: 6244359 (2001-06-01), Bridges et al.
patent: 6702012 (2004-03-01), Bailey et al.
patent: 7080685 (2006-07-01), Bailey et al.

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