| 摘要 |
A pipe stopper is receivable in the bell of a bell and spigot pipe for plugging the bell passage. It is a molded plug of stiff set plastic having a cylindrical peripheral face which is spaced from its inner end and a peripheral seating face extending therefrom entirely to the inner end of the plug. An abrupt generally radially extending shoulder extends between the adjacent ends of the faces. The plug is free from any shoulders or surfaces facing toward, and aligned with, faces or shoulders facing toward the inner end. An elastomeric gasket having an inner face resiliently engaging the seating face in embracing relation is provided. It has a radial cross section such that it cannot roll about its circumferential axis and thus off of the end of seating face. The gasket fits in sealing relation to the seating face and the surrounding inner wall of the pipe bell in which the plug is installed. The main advantage is that the plug is of a shape that can be molded readily in a very simple mold, and yet, in combination with a proper gasket, seals effectively.
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