Patent ID: 7600788

Claim:
A fast-fit coupling ( 1 ) for a fluid circulation system comprising at least two conveying members ( 2 ) of a fluid; said coupling ( 1 ) comprising: a receiving body ( 6 ) for each of said conveying members ( 2 ); fastening means ( 13 ) carried by said body ( 6 ), shiftable by said conveying member ( 2 ) according to an insertion direction (I) of said conveying member ( 2 ) inside said body ( 6 ), and integral with said conveying member ( 2 ) when said conveying member ( 2 ) is moved in a disconnection direction (D) from said body ( 6 ) opposite to said insertion direction (I); locking means ( 14 ) adapted to cooperate with said fastening means ( 13 ) to lock said conveying member ( 2 ) in a predetermined position inside said body ( 6 ) and to prevent the disconnection from the body ( 6 ) itself; sealing means ( 10 ) adapted to fluid-tightly abut against an external surface of the respective conveying member ( 2 ) so as to prevent fluid leakage and interposed between said fastening means ( 13 ) and said locking means ( 14 ); and releasable constraint means ( 20 ) attached to said locking means and activatable for restraining said locking means ( 14 ) to said body ( 6 ) and preventing said conveying member ( 2 ) to be disconnected, and deactivatable for disconnecting said locking means ( 14 ) from said body ( 6 ) and allowing said conveying member ( 2 ) to be disconnected; said locking means ( 14 ) and said body ( 6 ) being disengageable/engageable by means of a relative rotation; characterised in that said relative rotation is less than ninety degrees so as to reduce the space needed to reciprocally engage/disengage said locking means ( 14 ) and said body ( 6 ).