Patent ID: 7264517

Claim:
Unipolar safety electric connector, comprising a male connector ( 200 ) shell ( 220 ) and a female connector ( 100 ) shell ( 120 ), corresponding male ( 230 ) and female ( 130 ) inner electric contacts being provided within said male ( 200 ) and female ( 100 ) connectors, the female connector ( 100 ) shell ( 130 ) providing on its outer portion a “L” shaped guide groove ( 170 ), having one arm along the longitudinal coupling direction of the shells and the other arm ( 171 ) along the transverse direction, a key ( 270 ) being insertable within said “L” shaped groove ( 170 ), said key ( 270 ) being provided on the edge of the male connector ( 200 ) shell ( 220 ), said key ( 270 ), once introduced longitudinally at the bottom of said “L” shaped guide groove ( 170 ), engaging, by rotation of one shell with respect to the other one, with the transverse arm ( 171 ) of said “L” shaped guide groove ( 170 ), so as to prevent every decoupling by direct moving away according to a longitudinal direction of the male connector ( 200 ) shell ( 220 ) from female connector ( 100 ) shell ( 120 ), said female connector ( 100 ) shell ( 120 ) wherein inner female contact ( 130 ) comprises a reference mechanical element projecting from the inner surface, inner male contact ( 230 ) being a male element ( 230 ) without rotational symmetry, suitable to be introduced within the inner female contact guided by said mechanical element ( 140 ) and suitable to be subjected to a partial rotation, always guided by the same mechanical element ( 140 ), phase or polarity of the male electric contact ( 200 ) being determined by a first relevant angular position between said key ( 270 ) and the angular position of the inner male contact ( 230 ) portion ( 231 , 233 ) that must slide aside said mechanical element ( 140 ), phase or polarity of the corresponding female electric contact being determined by a second angular position of said guide groove ( 170 ) with respect to said mechanical element ( 140 ), said second angular position having the same absolute value and corresponding to said first angular position, said first and second angular position varying on the basis of the specific phase or polarity so that each male contact can be only introduced within a female contact having the same phase or polarity.