发明名称 Percussion rock drill bit
摘要 A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at least one fluid passage which emerges in or in the vicinity of a front face of the head. The fluid passage connects to a first groove which connects to a second groove, wherein at least three second grooves are provided and form between them axially forward lands. Each land carries a gauge insert. The gauge inserts are asymmetrically positioned on the drill bit, and the second groove extends radially inwards to or beyond an imaginary circle touching the radially innermost points of the inserts.
申请公布号 US5794728(A) 申请公布日期 1998.08.18
申请号 US19960772286 申请日期 1996.12.20
申请人 SANDVIK AB 发明人 PALMBERG, GOERAN
分类号 E21B10/36;E21B10/56;(IPC1-7):E21B10/36 主分类号 E21B10/36
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