Patent ID: 7165792

Claim:
A device improving the stiffness of structure of a vehicle, in particular a vehicle with a retractable roof, characterised in that it comprises, between a rear edge ( 1 a ) of a vehicle door ( 1 ) and an adjacent edge ( 12 B) of bodywork ( 12 ) of said vehicle, at least one first element ( 2 ) comprising an electromagnet ( 2 a ) fixed to one ( 1 a ) of said edges and, opposite said electromagnet, at least one second element ( 7 ) comprising a magnetic material ( 7 a ) fixed to the other edge, one of said first ( 2 ) and second ( 7 ) elements being able to move towards the other element when the electromagnet ( 2 a ) is supplied with an electric current, facing ends ( 2 b , 7 b ) of said element ( 2 , 7 ) being shaped so as to be able to fit axially one in the other, further characterised in the end of the first element or elements ( 2 , 4 ) has a protuberance in the form of a truncated cone ( 2 b , 4 b ) and the end of the second element or elements ( 7 , 9 ) has a cavity with a complementary shape ( 7 b , 9 b , and further characterised in that said first and second elements ( 2 , 4 , 7 , 9 ) cooperate with reciprocally movable mechanical means for locking, thereby making it possible to lock them axially on each other when the ends of said elements are fitted one in the other, being further characterised in that the said means comprise a finger ( 17 ) secured to one ( 9 ) of the elements able to engage in an opening ( 18 ) formed in the other element ( 4 ), when the ends of the said elements are fitted one in the other.