Patent ID: 7736142

Claim:
Blow moulding machine ( 10 ) for the manufacture of containers based on preforms made of thermoplastic by blow moulding or stretch-blow moulding, comprising at least one turntable ( 12 ) that is mounted so as to rotate about a substantially vertical axis (A 1 ) and that supports at least one console ( 16 ), of the type in which the console ( 16 ) supports two half-moulds ( 20 , 22 ) that are designed to form the body of the container and a mould base ( 32 ) that is designed to form the bottom of the container, of the type in which the two half-moulds ( 20 , 22 ) are mounted so as to be movable relative to one another between a closed position suitable for moulding and an open position suitable for stripping and loading a preform, of the type in which the mould base ( 32 ) is driven so as to slide relative to the console ( 16 ), in a sliding direction (A 3 ) substantially parallel to the axis of rotation (A 1 ), by a cam system ( 46 ) between a top position suitable for moulding and a bottom position suitable for stripping, and of the type in which the mould base ( 32 ) is designed to be nested in the half-moulds ( 20 , 22 ) when it occupies its top position and when the half-moulds ( 20 , 22 ) occupy their closed position, characterized in that the console ( 16 ) comprises at least one return member ( 48 , 50 ) that forces the mould base ( 32 ) towards its top position, and in that the cam system ( 46 ) comprises a cam follower element ( 52 ) that is slidingly connected to the mould base ( 32 ) and that interacts with a control surface ( 54 ) fixed relative to the turntable ( 12 ) and oriented downwards, so that the cam system ( 46 ) moves the mould base ( 32 ) towards its bottom position, against the force exerted by the return member ( 48 , 50 ).