Molding unit comprising improved compensating means and extrusion-blow molding machine equipped therewith

A molding unit for an extrusion-blow molding machine for articles made of thermoplastic material, of the type in which the molding unit (10) comprises a mold in two parts, each mold-half (12, 14) being borne by a support (16, 18), of the type in which the two supports (16, 18) can be moved relative to each other between an open position in which the two mold-halves (12, 14) are transversely separated from each other to allow the insertion of a parison in a cavity (20) delimited between the two mold-halves (12, 14), and a closed position in which the front faces of the two mold-halves (12, 14) are pressed against each other, and in which the supports (16, 18) are connected to each other by locking means, and of the type in which the molding unit (10) comprises, between at least one of the mold-halves (12) and the associated support (16), fluid pressure compensating means that push the mold-half (12) transversely from a retracted position to an advanced position, toward the other mold-half (14),

• characterized in that the mold-half (12) has controlled pull-back means (48) for pulling back the mold-half (12) to its retracted position.