Patent ID: 6863555

Claim:
A power-cord connection set comprising: a plug having a plug case and a pair of plug terminals mounted in the plug case; a hollow plug adapter that is detachably mounted on the plug case and that comprises both a space for inserting the plug case and an annular joining protrusion that has a tapered cross-section that is positioned around the plug terminals when the plug case is inserted to a prescribed position; an outlet that has an outlet case and a pair of terminal receptors mounted in the outlet case; an annular joining depression that has a tapered cross-section and that is positioned around insertion holes of the terminal receptors in the outlet case and formed so as to correspond to the annular joining protrusion; wherein the annular joining protrusion further has an annular-plug insulating connector protruding from a side of said protrusion which faces the outlet; wherein the outlet case comprises both the annular joining depression, and an annular-outlet insulating connector that is built into a base end of the annular joining depression, the base end having receiving holes corresponding to the plug terminals; wherein the annular joining depression and the annular-outlet insulating connector both have a tapered cross-section such that the annular joining depression and the annular-outlet insulating connector in combined form can fit the annular joining protrusion and the annular-plug insulating connector in combined form.