Patent ID: 7937816

Claim:
An assembly device between at least two panels ( 4 , 5 ), at least one of the panels ( 4 , 5 ) comprising at least one internal layer ( 1 ) inserted between two external metal sheets ( 2 , 3 ), the other panel ( 4 , 5 ) comprising at least one metal sheet ( 2 , 3 ), characterised in that at least one of the panels ( 4 , 5 ) comprises a cut section ( 6 ) to insert attachment means jointly in contact on a sheet ( 2 , 3 ) of one of the panels ( 4 , 5 ) and on a sheet ( 2 , 3 ) of the other panel ( 4 , 5 ), wherein the attachment means comprises a punching device ( 7 ) which forms the cut section ( 6 ) and assembles the panels ( 4 , 5 ), with the punching device ( 7 ) comprising at respective ends a head ( 8 , 15 ) resting on the external sheet ( 2 ) of one of the panels ( 4 , 5 ) and at least one flap ( 9 ′, 14 ′) against the external sheet ( 2 ) of the other panel ( 4 , 5 ) after passing through the panels ( 4 , 5 ) and the punching device ( 7 ) comprising a slug ( 10 , 14 ) with a perforating end, the flap ( 9 ′, 14 ′) being formed by compression of the end.