发明名称 |
Safety lock for elevators |
摘要 |
An elevator having a safety lock is provided to prevent the inadvertent release of a tubular. In one embodiment, the elevator includes a body for supporting the tubular and a locking apparatus activatable by an upset portion of the tubular, the safety locking apparatus adapted to prevent the tubular handling apparatus from releasing the tubular when activated. In another embodiment, the elevator is provided with a secondary override locking device for the safety lock so that jarring operations may be performed using the elevator.
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申请公布号 |
US2006011352(A1) |
申请公布日期 |
2006.01.19 |
申请号 |
US20050184934 |
申请日期 |
2005.07.19 |
申请人 |
NELSON ROBERT;JANSEN MARTIN |
发明人 |
NELSON ROBERT;JANSEN MARTIN |
分类号 |
E21B19/18;E21B19/06;E21B41/00 |
主分类号 |
E21B19/18 |
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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