Patent attributes
A stripper rubber comprising a resilient stripper rubber body, an insert support, and a plurality of stripper rubber inserts. The resilient stripper rubber body has a drillstring bore extending therethrough. The insert support is at least partially within the body. The insert support includes a central opening generally aligned with the drillstring bore thereby allowing a drillstring to pass jointly through the central opening and the drillstring bore. The plurality of stripper rubber inserts are each at least partially disposed within the body. The inserts are arranged in a side-by-side manner around the drillstring bore with a first end portion thereof pivotably engaged with the insert support. Each one of the inserts is offset from the drillstring bore for precluding the inserts from being exposed from within the body at the drillstring bore.
