Patent ID: 8425220

Claim:
A blow-moulding unit for making plastic containers ( 2 ) from respective parisons ( 3 ), and comprising: a mould ( 16 ) having at least one cavity ( 19 ) for blow-moulding a respective container ( 2 ) and being interchangeable with another mould ( 16 ) having a different number of moulding cavities 19 ); a mounting frame ( 34 ); at least two stretching rods ( 33 ) coupled to the mounting frame ( 34 ) to move along a longitudinal line ( 24 ) along which the rods themselves extend so as to engage and longitudinally deform respective parisons ( 3 ) housed in the at least one moulding cavity ( 19 ); a mounting slider ( 35 ) designed to be coupled to the stretching rods ( 33 ) and which is movable longitudinally relative to the mounting frame ( 34 ) and connected to an actuator ( 37 ) that longitudinally moves the stretching rods ( 33 ) coupled to it; fastening means for fixing a sub-assembly of the at least two rods ( 33 ) to the frame ( 34 ) in a raised position where it does not interfere with the parisons ( 3 ); selective coupling means for connecting to the slider ( 35 ) the remaining rods located in a lowered operating position, leaving the slider ( 35 ) free to slide longitudinally relative to the rods of said sub-assembly.