Snow chains with a limited bulk

1. A snow chain ( 2 ) comprising:

an inner ring ( 3 ), designed to be closed on the side of the wheel destined to face towards the inside of the vehicle,

an outer ring, designed to be closed on the side of the wheel destined to face toward the outside of the vehicle, and

a series of portions of anti-skid chain ( 10 ), disposed on the tread of the tyre ( 1 ) of the wheel, which join the outer ring and the inner ring ( 3 ),

said portions of chain ( 10 ), are chains with twisted links, connected to each other by means of joining elements ( 4 ) shaped as triangular links,

said portions of chain ( 10 ) being connected to said inner ring ( 3 ) by means of a U-bolt connecting system ( 5 ) comprising:

a U-bolt element ( 50 ) hinged to an end link ( 11 ) of a respective portion of chain ( 10 ), said U-bolt element comprising a plate bent in U-shape around a core ( 31 ) of said inner ring ( 3 ), so as to form a substantially semi-cylindrical portion ( 51 ) which surrounds the core ( 31 ) of the inner ring, so as to be able to rotate around said core ( 31 ), and in that said U-bolt element ( 5 ) is hinged to the end link ( 11 ) by means

of a pivot or pin ( 55 ) mounted in said U-bolt element ( 50 ) in a transverse direction with respect to the axis of said semi-cylindrical portion ( 51 ), and

of a joining element ( 60 ) mounted rotatably around said transverse pin ( 55 ) of the U-bolt element and interlinked with the twisted end link ( 11 ) of said portion of chain with twisted links ( 10 );

wherein said joining element ( 60 ) comprises a flattened part provided with a hole ( 63 ) designed to be engaged by said pin ( 55 ) of the U-bolt element ( 50 ) and a U-shaped curved portion ( 61 ) on said flattened part to interlink said twisted end link ( 11 ) of said portion of chain with twisted links ( 10 ) with said joining element ( 60 ), and

wherein said joining element ( 60 ) is obtained from a plate bent in U-shape around the twisted end link ( 11 ) of said portion of chain with twisted links ( 10 ), and said flattened part comprises flattened edges ( 62 ) that are overlapping such that said hole ( 63 ) extends through each said flattened edge.

2. A snow chain ( 2 ) according to any one of claim 1 , wherein said U-bolt element ( 50 ) comprises a semi-cylindrical portion ( 51 ) destined to be disposed rotatably around the core ( 31 ) of the inner ring ( 3 ) and two flat portions ( 52 ) parallel and spaced apart from each other so as to leave an empty space between them to receive said joining element ( 60 ).

3. A snow chain ( 2 ) according to claim 1 , wherein said portions of chain with twisted links ( 10 ) are disposed in a diamond configuration on the tread of the tyre (I) and are connected by portions of connecting chains with twisted links ( 10 ′) disposed along the middle portion of the tyre, the two portions of chain ( 10 ) forming two sides of the diamond and the respective portion of connecting chain ( 10 ′) being connected to each other by means of said joining element ( 4 ) shaped as a triangular link.

4. A snow chain ( 2 ) according to claim 1 , wherein said joining element ( 4 ) shaped as a triangular link is twisted around the axes of the respective sides to receive three respective twisted end links ( 11 ) of portions of chain ( 10 , 10 ′).

5. A snow chain ( 2 ) according to claim 1 , wherein said inner ring ( 3 ) is closed by means of a closing device ( 8 ) comprising a first engagement element ( 80 ), constrained to one end of the inner ring and to a portion of chain ( 10 ), which engages with a second complementary engagement element ( 90 ) constrained to the other end of the inner ring and to another portion of chain, each of said engagement elements ( 80 , 90 ) being obtained by means of a pair of plates coupled together.