| 摘要 |
A coupling for safely and detachably connecting lengths of drill pipe into a rotary well drilling string including a cylindrical sleeve mounted on and surrounding the upper extremity of each length to telescopically receive the lower extremity of the next above length. Diametrically spaced pads externally mounted on and adjacent the lower extremity of each length and spaced-apart tenons formed on each sleeve so as to pass between the pads of the next above length to prevent relative rotation between the lengths. A rotatable clamping ring surrounding said tenons and provided with internal segments adapted to be brought into engagement with inclined cam bosses on said tenons to lock the latter in place between said pads.
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