| 摘要 |
<p>A coupling or connector comprises a mating male member and a female member each being provided with circumferentially and laterally spaced, interrupted threads, cams or lugs having no lead angle. The male member is fully seated in the female member with the threads, cams or lugs so positioned that upon rotation of one member relative to the other for a few degrees in one direction, the threads, cams or lugs interlock or mesh with one another. When positioned for rotation, stop lugs, threads or cams are substantially circumferentially aligned, so as to not only limit the relative rotation between the members but also the direction in which the members can be rotated relative to one another. To disconnect the members, the rotation is reversed. The connector is especially adaptable for use with a cementing head through which cement is supplied to a casing of an oil well. The intermeshing of the threads provides tension and compression bearing surfaces. A locking means is associated with the head for locking the head against rotation when attached to the casing. Cooperating stop lugs on each of the members are threadedly engaged with the threads on the other of said members when the members are releasably coupled together to thereby augment the interengaged surface area of the members and thus the strength of the joint.</p> |
