| 摘要 |
An apparatus for use in a top drive for releasably holding a tubular, the apparatus comprising at least two opposed clamping apparatuses (280), spaced-apart for selective receipt of a tubular to be clamped therebetweeen, each of the two opposed clamping apparatuses having a mount (293) and a piston (281) movable within the mount (293), the piston (281) selectively movable toward and away from a tubular to be clamped, two spaced-apart telescopic legs (283,285) which in use depend from a part of the top drive, the telescopic legs (283,285) for moving the at least two opposed clamping apparatus (280) in a substantially vertical plane. |
