发明名称 |
Jack for carrying and installing mine panels |
摘要 |
A jack includes a base, a guide extending from the base, and an extensible member having an extensible fit with the guide and extending from the guide to have a free end. A support is located at the free end of the extensible member. An actuator is capable of extending the extensible member. The guide and extensible member have portions which are laterally offset with respect to the base and the support such that when the support is in pressure engagement with a panel, the laterally offset portions are disposed adjacent one side of the panel to leave an area between opposite sides of the panel substantially unobstructed.
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申请公布号 |
US7438506(B2) |
申请公布日期 |
2008.10.21 |
申请号 |
US20070733489 |
申请日期 |
2007.04.10 |
申请人 |
KENNEDY METAL PRODUCTS & BUILDINGS, INC. |
发明人 |
KENNEDY WILLIAM R.;KENNEDY JOHN M. |
分类号 |
E21D15/14;E21F17/103 |
主分类号 |
E21D15/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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