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公开(公告)号：US10526844B2
公开(公告)日：2020-01-07
申请号：US15444339
申请日：2017-02-28
Applicant: MHWIRTH AS
Inventor： Stian Lantz
Abstract: A top drive for a drilling rig includes a top drive housing, a threaded element used in a drilling operation, the threaded element having a grooved surface, and a back-up wrench with a toothed surface which engages with the grooved surface of the threaded element. The back-up wrench is suspended from the top drive housing. The back-up wrench is movable in relation to the top drive housing so as to selectively engage the threaded element.
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