| 摘要 |
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.
|
