发明名称 |
Method of folding an articulating mast |
摘要 |
An articulating derrick having a back face, a pair of opposed sides with each side having at least one leg, and an open face. The back face of the derrick includes a plurality of pairs of back face cross supports. Each cross support has a first and a second opposed end. Each first end is pivotally attached to one of the legs. A bushing pivotally connects the second ends of each pair of cross supports in order to permit movement of the back face between a folded, storage position and an open position.
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申请公布号 |
US6594960(B2) |
申请公布日期 |
2003.07.22 |
申请号 |
US20010954906 |
申请日期 |
2001.09.18 |
申请人 |
WOOLSLAYER COMPANIES, INC. |
发明人 |
BRITTAIN JOHN;VOGT DEWAYNE |
分类号 |
E21B15/00;(IPC1-7):B66C23/60 |
主分类号 |
E21B15/00 |
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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