发明名称 |
Improved rock drill bit with neck protection. |
摘要 |
A rotary drill bit for boring a bore hole in an earthen formation includes a bit body having a pin end, a cutting end and a longitudinal axis and including at least two legs extending from the cutting end. Each of the legs includes a leading side surface, a trailing side surface, and a shoulder, and each of the legs further includes a bearing and a cutter cone rotatably supported on the bearing. The bit body further including a fluid flow system that includes a flowway in the pin end. The flowway is in fluid communication with at least one exit port in the cutting end. The bit body further includes a neck between the shoulders and the pin end and a hard, wear-resistant material on at least a portion of the neck. |
申请公布号 |
ZA200003648(B) |
申请公布日期 |
2001.03.06 |
申请号 |
ZA20000003648 |
申请日期 |
2000.07.19 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
LANCE T. RICHMAN;PETER T. CARIVEAU |
分类号 |
B23B;E21B10/08;E21B10/18;E21B10/26;E21B10/46;E21B17/10;E21C |
主分类号 |
B23B |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|