The subject innovation is the aperture by said helical groove during advancing and retreating operation by equipped with a closing means of the stop driving system to the terminal hole outlet (socket) and, forming the tip of the spiral groove of the plug-in end to the insertion and exit of the plug-in terminal as the configuration that the movable wings are rotated forward and reverse receptacle (socket) terminal hole is about to be opened or closed by one be able to promote the user of the safety outlet hole opening safety-environment,
The subject innovation is in an unexpected danger of electric shock, that is to open and close the terminal holes (2) of the socket (1) and the outlet hole opening and closing safety device for preventing in advance, the outlet is connected to terminal 4 of the plug 3 is inserted ( a number of movable blades (5a) are connected to terminals of the plug 3 is inserted into mounting the nesting assembly with diaphragm-type opening and closing means (5) forms a circle, and in the terminal holes (2) in the terminal hole (2) of: 1) (4) the lower part to form a helical groove (4a) of the connection terminals (4) end portion advanced deny each movable to form a cone-shaped through cutting edge portion when inserting the connection terminals (4) the wings (5a) that reverse rotation of the and while inserted riding the helical groove (4a) beoleojyeo its center to be opened and the terminal holes (2), the connection terminal (4) as take-riding withdrawn when the helical grooves (4a) each of the movable blade (5a) that is configured to move the center of the forward rotation handed down by tightening the terminal holes (2) is closed, It characterized.