Hinge for the rotatable movement of a door or similar closing element

1. A hydraulic hinge for the rotatable movement of a closing element between a closing position and an opening position, the closing element being anchorable to a stationary support structure, hydraulic hinge comprising:

a fixed element ( 20 ) adapted to be anchored to the stationary support structure; and

a movable element ( 10 ) adapted to be anchored to the closing element, said fixed element and said movable element being mutually coupled so that the movable element rotates with respect to the fixed element around a first longitudinal axis (X);

wherein one of said fixed element ( 20 ) or said movable element ( 10 ) includes at least one working chamber ( 11 ) defining a second longitudinal axis (Y), said at least one working chamber ( 11 ) including at least one portion ( 14 , 15 ) comprising:

a plunger element ( 30 ) slidable along said second axis (Y), said plunger element ( 30 ) being operatively coupled with another one of said fixed element ( 20 ) and said movable element ( 10 ) so that a rotation of the movable element ( 10 ) corresponds to a sliding of the plunger element ( 30 ); and

a working fluid for hydraulically damping a movement of said movable element ( 10 );

wherein said plunger element ( 30 ) comprises a stem ( 131 ) defining said second axis (Y) and a head ( 135 ) sealingly inserted into said at least one working chamber ( 11 ) to partition said at least one portion ( 14 , 15 ) of the at least one working chamber ( 11 ) in at least one first and one second variable volume compartment ( 18 , 19 ) fluidically communicating with each other;

wherein said head ( 135 ) comprises:

a first and a second disc-shaped element ( 140 , 136 ) both inserted into said stem ( 131 ); and

a hydraulic duct ( 60 ) to allow a through-flow of said working fluid from said first variable volume compartment ( 18 ) to said second variable volume compartment ( 19 ) and vice versa;

wherein at least one of said first and said second disc-shaped element ( 140 , 136 ) is slidable with respect to another one thereof between a proximal position, in which a mutual distance therebetween is minimum and a distal position, in which the distance therebetween is maximum, so as to adjust a rotation speed of the closing element (D) between a closing position and an opening position;

wherein one of said first and second disc-shaped element ( 140 , 136 ) has a first operative surface ( 141 ), which includes an opening ( 143 ) fluidically connected with said first and said second variable volume compartment ( 18 , 19 ); and

wherein another one of said first and said second disc-shaped element ( 140 , 136 ) has a second operative surface ( 138 ), said first and second operative surfaces ( 141 , 138 ) being mutually faced and shaped so that when said first and said second disc-shaped element ( 140 , 136 ) are in said proximal position, an interspace between said first and said second operative surface ( 141 , 138 ) defines a calibrated passage ( 150 ) for the working fluid, said hydraulic duct ( 60 ) including said calibrated passage ( 150 ) and said opening ( 143 ).

2. The hydraulic hinge according to claim 1 , wherein said first operative surface ( 141 ) of said one of said first and said second disc-shaped element ( 140 , 136 ) comprises a first working zone ( 146 ) and a second abutment zone ( 145 ), and wherein, when said first and second disc-shaped element ( 140 , 136 ) are in said proximal position, said second abutment zone ( 145 ) and said second operative surface ( 138 ) are mutually in contact and said first working zone ( 146 ) and said second operative surface ( 138 ) are mutually spaced apart so as to define said calibrated passage ( 150 ).

3. The hydraulic hinge according to claim 2 , wherein when said first and second disc-shaped element ( 140 , 136 ) are in said proximal position, the distance (d 2 ) between said second operative surface ( 138 ) of said other one of said first and said second disc-shaped element ( 140 , 136 ) and said first working zone ( 146 ) defines a minimum section of said calibrated passage ( 150 ).

4. The hydraulic hinge according to claim 2 , wherein said first operative surface ( 141 ) of said first disc-shaped element ( 140 ) has an annular relief ( 144 ) defining said second abutment zone ( 145 ), said opening ( 143 ) being placed in fluid communication with said first working zone ( 146 ).

5. The hydraulic hinge according to claim 1 , wherein said stem ( 131 ) has a step ( 132 ) having an abutment surface ( 133 ) for said second disc-shaped element ( 136 ), said second disc-shaped element ( 136 ) being slidably interposed between said step ( 132 ) and said first disc-shaped element ( 140 ) and being at contact with the step or with the first disc-shaped element when said first and said second disc-shaped element ( 140 , 136 ) are respectively in said distal or said proximal position.

6. The hydraulic hinge according to claim 1 , further comprising elastic or viscoelastic counteracting means ( 160 ) interposed between said first and second disc-shaped element ( 140 , 136 ) to act on the latter when they are passing from the distal position to the proximal position.

7. The hydraulic hinge according to claim 6 , wherein said elastic or viscoelastic counteracting means ( 160 ) comprise an elastomeric ring interposed between said first and said second operative surfaces ( 141 , 138 ) of said first and said second disc-shaped element ( 140 , 136 ).

8. The hydraulic hinge according to claim 7 , wherein at least one of said first and said second operative surface ( 141 , 138 ) of said first and said second disc-shaped elements ( 140 , 136 ) comprises an annular seat ( 147 ) for said elastomeric ring.

9. The hydraulic hinge according to claim 1 , wherein said one of said first and second disc-shaped element ( 140 , 136 ) comprises at least one hydraulic sealing elastomeric element ( 38 ) cooperating with an inner surface of said at least one working chamber ( 11 ) to force a through-flow of the working fluid through said calibrated passage ( 150 ) and said opening ( 143 ).

10. The hydraulic hinge according to claim 1 , wherein upon both an opening and a closing of the closing element, the working fluid flows between said first ( 18 ) and second ( 19 ) variable volume compartment through said calibrated passage ( 150 ) and said opening ( 143 ).

11. The hydraulic hinge according to claim 1 , wherein at least one of said first and said second disc-shaped element ( 140 , 136 ) is made of an elastically yielding material.