| 摘要 |
PROBLEM TO BE SOLVED: To easily increase and decrease the number of receptacles, protect connection points made by increase of the number against dust and moisture, and yet limit the increase of the number of the receptacles. SOLUTION: A cord unit 1, a main body unit 3 having a plurality of receptacles, and an extension unit 2 having a plurality of receptacles are provided. The main body unit 3 is provided with a main body power source input part 3A connected to the cord unit 1 and having a structure of sealing a connection part with the cord unit, and a main body power source output part 3B having a structure of inhibiting mutual connection with the main body power source input part 3A and connected with the extension unit 2, and at the same time, the extension unit 2 is provided with an extension power source input part 2A connected with the main body power source output part 3B of the main body unit 3. Further, the main body power source input part 3B and the extension power source input part 2A have a structure of sealing these connection points. COPYRIGHT: (C)2006,JPO&NCIPI
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