Pneumatic and/or hydraulic fastening device, in particular of the multiple-connection type

A fixed block of a pneumatic and/or hydraulic fastening device, said fixed block being adapted to be fixed to a main operating machine and, to be alternatively coupled to and released from, a mobile block, said fixed block comprising first mechanical coupling means adapted to be switched between a first position and a second position, wherein the switching of said first mechanical coupling means of said fixed block from said first position to said second position and, from said second position to said first position, translates into the progressive engagement of second engaging and coupling means of said mobile block and in the mechanical coupling of said fixed block and said mobile block and respectively in the disengaging of said second engaging and coupling means of said mobile block and therefore in the mechanical release of said fixed block and said mobile block, wherein said fixed block comprises a cover that can be switched between a first position and a second position;

• characterized in that said first mechanical coupling means and said cover are shaped in such a manner that, with said cover and said first coupling means in said second position, the switching of said first mechanical coupling means from said second position to said first position translates into the automatic switching of said cover from said second position to said first position.