Patent ID: 8109756

Claim:
Blow-moulding installation ( 10 ) for the fabrication of a container from a blank ( 12 ), the installation comprising: a mould ( 20 ) which bounds an internal moulding cavity ( 18 ) in which the blank ( 12 ) can be arranged in such a way that an upper neck ( 14 ) of the blank ( 12 ) emerges from the cavity ( 18 ) of the mould ( 20 ), a blowing nozzle ( 28 ) which is movably mounted between a rest position in which the nozzle ( 28 ) is arranged above the neck ( 14 ) of the blank ( 12 ), and a blowing position in which the nozzle ( 28 ) capping the mould ( 20 ) is suitable for conveying a pressurized fluid into the blank ( 12 ), and a locking device ( 46 ) which comprises at least one means ( 46 a ) for locking the nozzle ( 28 ) and the mould ( 20 ) in the said blowing position, the locking means ( 46 a ) comprising at least one female element ( 48 a ) carried by the mould ( 20 ) and at least one male locking element ( 58 a ) which, joined to the nozzle ( 28 ), is movably mounted between: a locking position in which the male element ( 58 a ) cooperates with the female element ( 48 a ) to lock the nozzle ( 28 ) to the mould ( 20 ) in its blowing position, and an unlocking position in which the male element ( 58 a ) is released from the female element ( 48 a ) to allow the nozzle ( 28 ) to return to its rest position, characterized in that the locking means ( 46 a ) comprises a first means ( 98 a ) for returning the male element ( 58 a ) to its locking position, and in that the male element ( 58 a ) comprises an actuating surface ( 64 a ) which, during the movement of the nozzle ( 28 ) towards its blowing position, cooperates with a matching control surface ( 54 a ) joined to the mould ( 20 ) in order to mechanically force the male element ( 58 a ) towards its locking position against the first return means ( 98 a ), the said male element ( 58 a ) being returned automatically to its locking position when the nozzle ( 28 ) occupies its blowing position.