Device for producing hollow bodies of thermoplastic material

In a device for producing hollow bodies of thermoplastic material, of the type including a multi-part hollow mold mounted in a closure assembly, having a frame and movable in a housing between a blow station and a plasticating unit, on relatively movable mold platens carried by two supporting bars extending below the hollow mold in the closure assembly, the improvement comprising a locking mechanism provided on the upper parts of the mold platens, said locking mechanism comprising, in combination, a locking bush firmly secured to one mold platen;

• and a locking rod rotatably mounted in the other mold platen but fixed against axial displacement relative thereto;
• said locking rod having a lock head, designed as a symmetric hammer head, adapted to lockingly engage said locking bush;
• said locking bush having an opening conformable to said hammer head and formed with diametrically opposite catch webs;
• said hammer head having faces adapted to engage behind said catch webs upon rotation of said locking rod, said faces extending circumferentially of said locking rod and obliquely relative to the axis thereof;
• said locking mechanism being located at the corner of a right triangle situated in the junction plane of said hollow mold and whose other corners are the axes of said two supporting bars, the right angle of said triangle being at the axis of that supporting bar which is the trailing supporting bar considered in the direction of movement of said closure assembly from said blow station toward said plasticating unit.