| 摘要 |
A latex rubber cover molded to the base of the plugs on a construction type extension cord. When not in use, it is rolled back like rolling up the sleeve of a long sleeved shirt. When two cords with the latex cover are plugged into each other to make a longer cord, the latex cover on one plug is rolled onto itself and then onto the joined plug. When the cover is fully rolled out covering both plugs tightly, the latex cover on the joined plug is rolled out onto itself and the joined plug and on top of the first latex cover thus giving it a double seal on the joined plugs creating a waterproof joining of two extension cords. This also prevents the two plugs from pulling apart when being extended while being used.
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