| 摘要 |
A coupling device for metal pipes includes a cup-joint, a packing bushing, a padding bushing and a bridging connector. The cup-joint holds and confines in its confining face the packing bushing and the padding bushing to yield a central holding hole for accommodating metal pipe. When the set of cup-joint, packing bushing and padding bushing is screwed to the threaded head of the bridging connector, the guiding face of the cup-joint squeezes the converging ending of the padding bushing to yield an excellent sealing effect to the metal pipe, while in turn the padding bushing pushes and squeezes the fortifiers against the confining face and the metal pipe to yield a clasping and sealing effect against leakage inside the couple device.
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