发明名称 Stripper rubber with integral retracting retention member connection apparatus
摘要 A stripper rubber insert comprises a central bore and a plurality of retention member bores substantially perpendicular to the central bore. The retention member bores are angularly spaced apart around a perimeter of the stripper rubber insert. Each one of the retention member bores extends through an exterior insert edge face and an interior insert edge face. Each one of the retention member bores includes a respective retention member securing structure therein.
申请公布号 US7669649(B2) 申请公布日期 2010.03.02
申请号 US20070975201 申请日期 2007.10.18
申请人 WILLIAMS JOHN R 发明人 WILLIAMS JOHN R.
分类号 E21B19/00 主分类号 E21B19/00
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