| 摘要 |
This invention relates to a method for forming the fitting. The figure shows the same fragmentary portion of the fitting(12) and pipe section(28) with a spigot(33) of a second pipe section assembled into the fitting. The generally cylindrical fitting includes two steps at which its diameter decrease progressively toward the inner end of the fitting(18). The steps and decreased-diameter areas are formed by a disclosed spin-forming method which imparts superior strength and stability. The result is a less expensive, easier to assemble and more accurate, dependable pipe joint which tolerates relatively wide deviation in pipe dimensions.
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