Electric shock-proof security device of a receptacle

An electric shockproof security device for an electric receptacle, which comprises a cover, right and left stoppers, springs and a supporting seat;

• the supporting seat being made of an electrical insulating material and being adapted to cover an insulating seat at an upper end of an electric receptacle, the supporting seat including a frame for receiving the two stoppers, springs and cover;
• the frame including holes adapted for prongs of an electric plug to pass therethrough, and posts for respectfully holding ends of the springs;
• the cover including holes adapted for prongs of an electric plug to pass therethrough, the holes of the cover being aligned with the holes of the frame, and the surface of the cover adjacent the holes of the cover being beveled for guiding prongs of an electric plug into the holes of the cover;
• the right stopper having an integral structure with an upper section and a lower section, the upper and lower sections including flat portions, ends of the flat portions of the upper and lower sections being joined together by a stepped portion, another end of the upper section including a first sloping surface adapted to interact with a prong of an electric plug, the lower section having a middle portion with a rectangular hole, another end of the lower section having a block that protrudes upwardly, and the block having a second sloping surface adapted to interact with a prong of an electric plug;
• the left stopper having an integral structure including a frame;
• the frame including side panels with front, middle and rear strips extending between the side panels;
• an outer side of the front strip including a third sloping surface adapted to interact with a prong of an electric plug, the rear strip including a lower recess and a block that protrudes upwardly, and the block of the rear strip of the left stopper having a fourth sloping surface adapted to interact with a prong of an electric plug;
• the springs being respectively formed by folding a long metal piece;
• a first end of the long metal piece having a cylinder and a second end of the long metal piece being bent to provide elastic resilience;
• the right stopper being arranged within the left stopper;
• so that the upper section of the right stopper rides on the middle strip and the lower recess of the rear strip of the left stopper, the front strip of the left stopper rides on the lower section of the right stopper, the first sloping surface of the right stopper faces the fourth sloping surface of the right stopper, the second sloping surface of the right stopper faces the third sloping surface of the right stopper;
• the cylinders of the springs are arranged about the post of the supporting seat and the second ends of the springs are arranged to bias the first sloping surface of the right stopper toward the fourth sloping surface of the right stopper and to bias the second sloping surface of the right stopper toward the third sloping surface of the right stopper, so that the holes of the frame are covered and access to electrical contacts is prohibited;
• and
• the right and left stoppers working together to prohibit access to the holes of the frame when an item is individually inserted between the first sloping surface of the right stopper and the fourth sloping surface of the right stopper, and when an item is individually inserted between the second sloping surface of the right stopper and the third sloping surface of the right stopper;
• and the right and left stoppers working together to permit access to the holes of the frame when two electrical prongs are simultaneously and respectively inserted between both the first sloping surface of the right stopper and the fourth sloping surface of the right stopper and the second sloping surface of the right stopper and the third sloping surface of the right stopper.