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A TAPPING TEE FOR MOUNTING ON A PIPELINE
A TAPPING TEE FOR MOUNTING ON A PIPELINE
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机译：安装在管道上的攻牙三通
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摘要
A tapping tee comprising a body portion defining a drive socket and one or more outlet sockets in communication with the drive socket, and a saddle portion adapted to mate with and be mounted on the exterior of a main pipeline formed of a plastic material or the like. A stem member is mounted within the drive socket for rotatable and axial movement therein, such as by threaded connection. At its inner end, the stem member comprises a cylindrical cutter having a thin annular wall with a downwardly and inwardly, uniformly tapering exterior surface. When the stem member is rotated within the drive socket, such as by a suitable tool engaged with its outer end, the cutter is rotated and advanced inwardly into engagement with the plastic main pipeline. The cutter severs a circular coupon from the main pipeline and this coupon is retained within the cutter, owing to the slight deformation inwardly of the lower portion of the thin annular wall of the cutter as it is advanced through the pipeline. The tapered outer surface of the cutter creates a complementary annular tapered surface defining the opening in the pipeline. The cutter can thereafter be mated with this annular tapered surface of the pipeline to seal the opening cut therein, with the resultant advantage that the cutter can serve as a valve member for sealing the cut opening in the pipeline after the coupon is removed therefrom. A stop member is provided on the stem member above the cutter for the purpose of limiting the upward movement of the stem member and also preventing the cutter from extending too far into the main pipeline.
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