Patent ID: 7516519

Claim:
A gate or door closing hinge ( 1 ) comprising: a first hinge part ( 2 ); a second hinge part ( 3 ); a hinge shaft ( 10 ) rotatably mounted about a first rotation axis ( 15 ) in the first hinge part ( 2 ) and connecting the first hinge part ( 2 ) to the second hinge part ( 3 ); a torsion spring ( 18 ) having a longitudinal axis coinciding substantially with said first rotation axis ( 15 ) and having a first end ( 19 ) fixed with respect to the first hinge part ( 2 ) and a second end ( 20 ) fixed with respect to the hinge shaft ( 10 ) to exert a moment onto the first hinge part ( 2 ); and means ( 21 , 24 ) for adjusting the moment exerted by the torsion spring ( 18 ) on the first hinge part ( 2 ), which adjusting means ( 21 , 24 ) comprise: a coupling element ( 21 ) which is interposed between the first end ( 19 ) of the torsion spring ( 18 ) and the first hinge part ( 2 ) and which is rotatably mounted in the first hinge part ( 2 ) about a second rotation axis ( 23 ) which coincides substantially with the first rotation axis ( 15 ); and a screw element ( 24 ) which is rotatably mounted in the first hinge part ( 2 ) about a third rotation axis ( 25 ) and which has a screw threaded portion ( 26 ) arranged to co-operate with the coupling element ( 21 ) to rotate the coupling element ( 21 ) with respect to the first hinge part ( 2 ) upon rotation of the screw element ( 24 ) about the third rotation axis ( 25 ) so as to adjust the moment exerted by the torsion spring ( 18 ) on the first hinge part ( 2 ), the coupling element ( 21 ) having a helical guide extending around the second rotation axis ( 23 ) and the screw element ( 24 ) co-operating with the coupling element ( 21 ) through the intermediary of a guided element ( 29 ) arranged to move along said helical guide ( 30 ) upon rotation of the screw element ( 24 ) to rotate the helical guide ( 30 ) and hence the coupling element ( 21 ) with respect to the first hinge part ( 2 ).