| 摘要 |
A releasable joint for use in a well tubing having a male and a female member and a seal therebetween in which one of the members has a connecting thread and the other member has a plurality of shear elements installed on a helix of the same lead as the connecting thread whereby the members may be rotatably engaged and disengaged as well as disengaged by shearing the elements by straight pull. In one embodiment the shear elements are threaded into holes extending through the female member whereby the shear value may be visually observed or changed without disassembling the joint. In another embodiment the shear elements may be positioned on the male member. The connecting thread may be formed of a plurality of segments which are spring loaded radially toward the other member and the thread may be of a buttress type.
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