| 摘要 |
A pin has a hollow body, an extension formed with the hollow body and provided with a passage defined to communicate with an interior of the hollow body and a sphere movably received in the hollow body. The hollow body is divided into a chamber to movably receive therein the sphere and a path by a step. The chamber has a diameter larger than that of the path so that the sphere selectively stops communication between the chamber and the path. The chamber has two elongated bosses oppositely formed on a bottom face defining the chamber and being apart from each other by the passage. An activating rod is integrally formed on the sphere and extends out of the path to so as to move the sphere inside the chamber.
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