Mould carrier unit with controlled nozzle

A mould carrier unit intended to be associated with an installation for manufacturing containers of the bottle type, by a stretch blow-moulding operation of preforms arranged in appropriate moulds of the jack-knife type or the like, which unit comprises:

• on the one hand, a stretching rod borne by a slide which is mobile along an axis x-x′ of the mould, under the action of an actuator device, over a distance C which is greater than a depth H of said mould, between an inactive position where a free end of the stretching rod is held at a sufficient distance from an inlet surface of said mould to permit the passage of means for transferring the preform and the moulded container, and an active position where the free end reaches the bottom of said mould,
• on the other hand, a nozzle comprising a body attached to the support structure of said mould carrier unit, which nozzle also comprises a telescopic sealed extension, in the form of a bell, which bell is mobile under the action of said actuator device for passing from an inactive position where a free edge of the bell is held substantially at the same level as the free end of the stretching rod to a sealed active position where said free edge is sealingly applied against said inlet surface to close the circuit of the blowing fluid,
• wherein said bell comprises a manoeuvring member which cooperates with said slide to permit said bell to pass from the sealed active position to the inactive position with the same law of motion as said stretching rod;
• and
• wherein said manoeuvring member which cooperates with the slide to shift the bell from the sealed active position to the inactive position comprises a bar which is attached at one end to said bell and which comprises at the other end a stop, which stop cooperates with a support formed on said slide so as to be driven thereby during the return of said stretching rod to the inactive position, said bar being parallel to said stretching rod.