| 摘要 |
Two pipes having at their ends to be coupled internal threads of the opposite hand are coupled by a coupling ring which has corresponding external threads. Rotating of the coupling ring is effected by means of an intermediate member encompassing the ring axially displaceable thereon. A locking device in the form of movable guide rings is interposed between the coupling ring and the intermediate member. These guide rings have protrusions which are engageable with corresponding recesses at the ends of the pipes. In the event the threads on the coupling ring are initially engaged with the threads on one pipe end only, rotation of the intermediate member causes axial displacement thereof with respect to its position relative to the threads on the coupling ring thereby causing engagement of the threads on the coupling ring with the threads of the second pipe also. Upon completion of the threading operation the guide rings are in pressure engagement with the intermediate member so that the latter is locked in its position relative to the pipes thereby absorbing torsional forces as may occur between the coupling ring and the intermediate member.
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