System for connecting a portion of chain to the inner ring of an anti-skid device with limited bulk

1. A system ( 5 , 60 ) for connecting portions of chain ( 10 ) to the inner ring ( 3 ) of an anti-skid device wherein:

said portions of chain ( 10 ) comprise chains with twisted links ( 11 ), each twisted link having two opposite portions disposed on two planes at 90° to each other,

said connecting system ( 5 , 60 ) comprising:

a U-bolt element ( 50 ) constrained to said inner ring ( 3 ), and

an end link ( 60 ) defining an end of the portion of chain ( 10 ),

characterized in that said end link ( 60 ) comprises a flat and straight portion ( 62 ) connected to said U-bolt element ( 50 ) and a twisted portion ( 61 ) connected to a twisted link ( 11 ) of the portion of chain ( 10 ), said twisted portion ( 61 ) being inclined by about 45° with respect to the plane on which said flat and straight portion ( 62 ) of the end link lies; and in that in that said twisted-link portion of chain comprises a plurality of said twisted links ( 11 ), each consisting of a substantially elliptical annular element which is twisted by bending the end parts thereof by 45° in one direction and in the opposite direction around the major axis thereof, so as to give rise to two portions disposed on two planes at 90° to one another.

2. A connecting system ( 5 , 60 ) according to claim 1 , characterized in that said U-bolt element ( 50 ) is articulated to the end link ( 60 ) of at least one respective portion of chain ( 10 ) with twisted links, said U-bolt element ( 50 ) consisting of a plate bent into a U-shape around a core ( 31 ) of said inner ring ( 3 ), so as to be able to rotate around said core ( 31 ).

3. A connecting system ( 5 , 60 ) according to claim 2 , characterized in that said U-bolt element ( 50 ) is articulated to the end link ( 60 ) 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 rotation thereof and in which the flat and straight portion ( 62 ) of said end link ( 60 ) of the portion of chain is mounted rotatably around said transverse pin ( 55 ) of the U-bolt element.

4. A connecting system ( 5 , 60 ) according to claim 2 , characterized in that said U-bolt element ( 50 ) comprises a semi-cylindrical portion ( 51 ) constructed to be disposed rotatably around the core ( 31 ) of the inner ring and two flat portions ( 52 ) parallel and spaced apart from each other so as to leave a gap to receive said flat and straight portion ( 62 ) of the end link ( 60 ) of the portion of chain ( 10 ).