| 发明名称 | Rock bolt | ||
| 摘要 | A hollow rock bolt comprising a shaft having a spiral form protruding from the exterior surface of the shaft, wherein the spiral form has a flank angle of between 30° and 60°. | ||
| 申请公布号 | US8851802(B2) | 申请公布日期 | 2014.10.07 |
| 申请号 | US200812675562 | 申请日期 | 2008.04.30 |
| 申请人 | Sandvik Intellectual Property AB | 发明人 | Weaver Steven;Horsch John |
| 分类号 | E21D20/00;E21D21/00 | 主分类号 | E21D20/00 |
| 代理机构 | Morgan, Lewis & Bockius LLP | 代理人 | Morgan, Lewis & Bockius LLP |
| 主权项 | 1. A hollow rock bolt comprising a shaft having a spiral form protruding from the exterior surface of the shaft, wherein the spiral form has a flank angle of between 30° and 60°, wherein the rock bolt further has a mounting end, an opposite drilling end and a hollow channel therebetween, wherein the drilling end is provided with a first attachment thread for attaching an anchoring device to the shaft and the mounting end is provided with a second attachment thread, wherein the first attachment thread has a handedness that is opposite from a handedness of the spiral form, and wherein the second attachment thread has the same handedness as the spiral form. | ||
| 地址 | Sandviken CH | ||