发明名称 |
Mine prop jack and method of prestressing a mine prop |
摘要 |
<p>A telescoping mine prop is prestressed by engaging the prop with a jack and thereby telescopically expanding the prop against opposing surfaces of the mine with the jack. Thereafter the prop is locked in position and the jack is disengaged from the prop for use with the expansion of another prop, thereby leaving the mine prop in a prestressed condition.</p> |
申请公布号 |
AU2011200454(A1) |
申请公布日期 |
2012.06.28 |
申请号 |
AU20110200454 |
申请日期 |
2011.02.03 |
申请人 |
CANYON FUEL COMPANY, LLC |
发明人 |
POULSON, KENNETH;GLEAVE, MAURY |
分类号 |
E21D15/14;E21D15/59 |
主分类号 |
E21D15/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|