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1.
公开(公告)号:US06494275B2
公开(公告)日:2002-12-17
申请号:US09796440
申请日:2001-03-02
申请人: Bengt Åsberg , Kenneth Larsson , Bertil Ederyd
发明人: Bengt Åsberg , Kenneth Larsson , Bertil Ederyd
IPC分类号: E21B1000
CPC分类号: E21B17/1092 , E21B10/003 , E21B10/36 , E21B10/38 , E21B17/0426
摘要: A rock drill bit for percussive drilling, especially top hammer drilling, includes a bit head provided with front rock crushing buttons and a skirt. The bit head is provided with a number of grooves formed in the outside of the skirt and extending in the axial direction of the drill bit. Protruding lands are defined between the grooves, which likewise extend in the axial direction. Axially rearward ends of at least some of the lands are formed with retrac teeth. Each retrac tooth has a cutting edge extending along an outer circumference of the skirt.
摘要翻译: 一种用于冲击钻的岩石钻头,特别是顶锤式钻孔,包括一个带有前部岩石破碎按钮和裙部的钻头头。 该钻头头设置有形成在裙部外侧并在钻头的轴向方向上延伸的若干槽。 凹槽之间被限定在凹槽之间,凹槽同样在轴向方向上延伸。 至少一些焊盘的轴向后端形成有回拉齿。 每个后掠齿具有沿裙部的外周延伸的切割边缘。
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公开(公告)号:USD525995S1
公开(公告)日:2006-08-01
申请号:US29212831
申请日:2004-09-09
申请人: Fredrik Bjork , Bertil Ederyd , Kenneth Larsson
设计人: Fredrik Bjork , Bertil Ederyd , Kenneth Larsson
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