Patent ID: 7887346

Claim:
A safety shutter device for an electrical receptacle comprising: a left sliding block; a right sliding block overlapping the left sliding block; a small sliding block; a sliding plate arranged to support the small sliding block such that the small sliding block slides longitudinally on the sliding plate; a supporting bracket arranged to slidingly support the right sliding block, the left sliding block, and the sliding plate; at least two flexible components, a first flexible component between the small sliding block and the sliding plate; at least one locking block; and at least one tapered nub, wherein: the sliding plate and the small sliding block are placed between the right sliding block and the supporting bracket, when an electrical plug is not inserted in to an electrical socket of an electrical receptacle, the at least one locking block is mated with the at least one tapered nub to form a self-locking mechanism such that the left sliding block, the right sliding block, the small sliding block, the sliding plate, and the supporting bracket are static relative to one another and cover an electrical hot line output conductive plug bush and a neutral line output conductive plug bush under the supporting bracket, and when the electrical plug is inserted into the electrical socket, the at least one locking block separates from the at least one tapered nub to unlock the safety shutter device such that the left sliding block, the right sliding block, the small sliding block, and the sliding plate slide to expose the electrical hot line output conductive plug bush and the neutral line output conductive plug bush under the supporting bracket.