| 摘要 |
A fitting for connection to a metal plain end pipe includes a generally cylindrical sleeve section sized to receive and cradle a pipe end portion, an annular seal in the sleeve section for forming a liquid tight connection between the pipe end portion and the fitting, and a screw cutter member extensible into the sleeve section for locking the pipe end portion to the fitting. An end surface of the cutter member has an annular ring of projecting cutting elements having intersecting faces forming metal cutting edges, each cutting element being respectively spaced from another cutting element by transverse recesses for relief of chips cut from the pipe. The cutting edges each have a rake angle configuration relative to the pipe end portion such that a limited cutting penetration is achieved under a predetermined pressure range and travel speed along a pipe end surface. The cutter member advances longitudinally and simultaneously rotates into cutting engagement with the pipe end portion faster than the ability of the cutting elements to cut, thereby simultaneously cutting and pushing the pipe end portion into snug engagement with the sleeve section.
|
