Blow mould

A blow mold, defining a longitudinal axis, for plastic containers comprising

• at least two half-molds;
• at least two half-mold holders, each half-mold holder supporting one of said two half-molds, each half-mold holder and each half-mold defining respective complementary coupling surfaces between half-mold holder and half-mold;
• at least two quick coupling devices, each quick coupling device being adapted to lock a respective half-mold to a corresponding half-mold holder;
• wherein each quick coupling device is fixed to a respective half-mold holder and comprises
• a bar, parallel to the longitudinal axis, inserted in one of two longitudinal edges of the half-mold holder and adapted to move only by rotation about an axis thereof;
• a bracket fixed to the bar and coupled to an actuator, said bracket actuatable by the actuator so as to actuate a rotation of said bar about the axis thereof;
• at least one locking fin fixed along said bar and adapted to move, by actuation of the rotation of the bar, from an unlocking position to a locking position in which said at least one locking fin interacts with the respective half-mold, whereby the respective half-mold and the corresponding half-mold holder are locked to each other in a position in which the respective complementary coupling surfaces are coupled to each other,
• wherein there are provided elastic tensioning means for pretensioning said at least one locking fin.