| 摘要 |
A pipe gripping device is taught which is useful for moving pipe into and/or out of a well. The pipe gripping device includes a first set of slips for holding a pipe in a pipe light condition and a second set of slips for holding a pipe in a pipe heavy condi tion. The second set of slips are actuatable independently from the first set of slips . The pipe gripping device can include a slip moving system which prevents the slip car rier blocks from being driven outwardly against the housing, to thereby prevent the carr ier blocks from locking, by being driven against the housing.
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