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专利名称：IMPROVEMENTS RELATING TO DRILLING
APPARATUS
发明人：Laurence John AYLING申请号：US15314278申请日：20150521
公开号：US20170191323A1公开日：20170706
专利附图：
摘要：A drilling apparatus () is for use on a rotary drilling rig with a top drive whichenables circulation and rotation of a drill string () to continue uninterrupted during themaking of drill string connections. It has a snubber gripping mechanism () to enable tool
joints () to be supported and gripped with a reduced pressure chamber () volume andsnubbing force, during tool joint connections. The gripping mechanism has gripping pads() arranged to move radially by relative rotation of a drive cylinder () causing a taperedsurface () of the drive cylinder () to press against or release the pad (). A guide cylinder ()supports and guides the pads () and collets () for retaining a drill string at an upsetshoulder ().
申请人：Laurence John AYLING
地址：Sneem, County Kerry IE
国籍：IE
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