A closing hinge for a closing element, the hinge comprising:
- a hinge body including a working chamber, the working chamber including a bottom wall;
- a pivot, the pivot and the hinge body being rotatably coupled to each other for reciprocally rotating about a first longitudinal axis X of the pivot between a closed position of the closing element and a first and a second open positions of the closing element, opposite to each other with respect to the closed position, the working chamber having a second longitudinal axis Y perpendicular to the first longitudinal axis X;
- wherein the pivot includes a cam;
- wherein the working chamber includes a cam follower and a shaft extending along the second longitudinal axis Y, the shaft having a first end and a second end opposite to each other, the first end of the shaft facing the cam, the shaft including an apertured seat at the first end, the shaft comprising a wheel disposed within the hinge body and being rotatably mounted in the apertured seat to rotate about a third axis parallel to the first longitudinal axis X and spaced apart therefrom, the third axis intersecting the second longitudinal axis Y, the wheel including a round peripheral edge;
- wherein the working chamber further includes a plunger disposed therein, the plunger and the second end of the shaft being connected to each other;
- wherein the working chamber further includes a spring configured to urge the plunger to thrust the round peripheral edge of the wheel to engage with the cam;
- wherein the cam is adapted to move the wheel along the second longitudinal axis Y from a position distal from the bottom wall of the working chamber, corresponding to the closed position of the closing element, to a position proximal thereto, corresponding to one of the first or second open positions of the closing element;
- wherein the spring is adapted to slidably return the wheel along the second longitudinal axis Y from the proximal position to the distal position;
- wherein the cam includes a first cylindrical pin and a second cylindrical pin respectively defining a fourth axis and a fifth axis spaced apart from the first longitudinal axis X and parallel thereto, the fourth axis and the fifth axis being a fixed distance from the first longitudinal axis, the first cylindrical pin including a first curved side wall, the second cylindrical pin including a second curved side wall;
- wherein the first and second cylindrical pins are disposed at opposite sides with respect to the first longitudinal axis X, and the first and second curved side walls of the pins engage with the round peripheral edge of the wheel at a single point upon the reciprocal rotation of the pivot and the hinge body between the closed position of the closing element and the first open position thereof or between the closed position of the closing element and the second open position thereof, the first and second curved side walls defining a plane that is perpendicular to the second longitudinal axis Y when the closing element is in the closed position,
- wherein the round peripheral edge of the wheel and the first and second cylindrical pins interface so that the round peripheral edge of the wheel, in the first or the second open positions of the closing element, only contacts either the first curved side wall or the second curved side wall at a single respective first or second point and so that at the closed position of the closing element the round peripheral edge of the wheel contacts both the first curved side wall and the second curved side wall only at respective third and fourth points, the single first and second points being at opposite sides of first longitudinal axis X.