| 摘要 |
A coupling used to connect together two laying or safety devices used in oil-wells, consisting of a hollow cylindrical shell, with two spiral apertures, of the same pitch, cut in opposite sides of it, and containing two split cylindrical components, which cannot move lengthwise in relation to the shell, and which include a narrower section beyond each end of the shell, followed by a wider section with truncated shoulders and plane sides; two wedges fit inside these components, and can push them apart, lengthwise mobility of these wedges being provided by pins which fit into the spiral apertures.
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