Patent ID: 7591046

Claim:
A sprung hinge for supporting closure elements, comprising: a first articulated quadrilateral and a second articulated quadrilateral, provided with and sharing a first lever and a second lever; a coupling plate for coupling the first lever to a fixed element; a fixing plate for fixing the second lever to a closure element; elastic means, to act between mutually opposite points of a first one of said first and second articulated quadrilaterals, the hinge having a closure configuration, in which a breadth of an angle formed between a plane of arrangement of said coupling plate and a plane of arrangement of said fixing plate is substantially equal to π/2 rad, and an open configuration, in which the breadth of said angle is substantially greater than π rad; and auxiliary elastic means, which are arranged in series to said elastic means, respectively, and act between mutually opposite points of a second one of said first and second articulated quadrilaterals, wherein each one of said first and second articulated quadrilaterals comprises said fixing plate, said first and second levers and one of a first and second arms, respectively, which are mutually articulated, said auxiliary elastic means acting between said fixing plate and said one of said first and second arms of one of said first and second articulated quadrilaterals and wherein said one of said first and second arms is constituted by two side walls which are mutually parallel, by a cross-member that joins said side walls which have opposite ends articulated so as to be rotatable about a first pivot coupled with said corresponding fixing plate, an edge of said cross-member forming a resting and articulation point for a first end of said auxiliary elastic means, a second end of said auxiliary elastic means being articulated to a second pivot, which is coupled with said fixing plate and is arranged parallel to said first pivot.