| 摘要 |
A jack for a telephone set comprises a dust-proof closure unit having a first cover plate provided with a guide groove extended in a sliding direction and a second cover plate provided with a guiding projection engageable in the guide groove of the first plate, the first and second cover plates being arranged slidable relative to each other along a plug receiving aperture in a casing of the jack to close or open the aperture, whereby the first and second cover plates of the closure unit can be retracted as overlapped with each other to their aperture opening position so as to reduce their retractive dimension substantially to be half in the sliding direction, and the dust-proof closure unit can be provided for the plug receiving aperture without any increase in size of the casing.
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