Safety female plug connector

Claim 1

A female safety socket, comprising an insulating casing with at least two insertion openings each extending into the casing from a mouth for the pins of a male plug, each of the insertion openings being provided inside the casing with a contact piece electrically connected to a connection terminal outside the casing adapted for connection to an electrical wire thereto; CHARACTERIZED in that: (a) each insertion opening is tapered from the insertion mouth inwards and is bounded along one side by a fixed piece substantially parallel to the direction of insertion and bounded along another side opposite said one side by a swinging piece hinged adjacent the mouth, one of said two pieces bounding the sides of said insertion opening being made of electrically conductive material and the other being made of insulating material; (b) resilient contact tongues, flexible transversely to the direction of insertion, disposed adjacent to respective ones of the electrically conductive pieces within the insulating casing but outside of the insertion openings, said contact tongues each being mounted at one end rigidly to the insulating casing and being electrically connected with said respective connection terminal; and, (c) connecting member connecting said swinging pieces for respective ones of the insertion openings to said contact tongue for the other insertion opening whereby as a male plug pin is inserted into one of the insertion openings said connecting member attached to said swinging piece disposed therein moves said contact tongue for the other insertion opening into electrical contact with said electrically conductive material bounding the other insertion opening thereby making electrical contact with a male plug pin disposed therein.