| 摘要 |
A foolproof jack includes a shell and at least one elastomer. The shell has at least one joining opening, and the joining opening corresponds to a first type plug. The elastomer sets in the joining opening, and stops a second type plug to plug in the joining opening. The second type plug is different from the first type plug. The elastomer has a body and at least one stop portion. The body is mounted in the shell. In a Y-direction, at least one arm outward extends from the body. In a Z-direction, a part of the arm is bent. In an X-direction, the stop portion extends inward from the arm.
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