B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/58 (2006.01)
Patent
CA 2616584
The invention relates to a plant (10) for blowing a pressure medium in a blank (12), which comprises a mould (12) which is used for receiving the blank (12) and comprises a top wall (24) trough which the neck (16) of the blank (12) is projected, a nozzle (22) which comprises a pressure medium lower output orifice (34) and is provided with an ring sealing joint (40) arranged under the lower circumference (44) of said output orifice (34) in such a way that the circumference (44) of the output orifice (34) surrounds the neck (16) of the blank (12). Said invention is characterised in that the sealing joint (40) is provided with a lower elastic annular lip (48) in such a way that the pressure medium rests on the top face (54) of said lip (48) for pressing the free annular lower edge (58) thereof against a supporting wall (18, 24), thereby ensuring the tightness of the nozzle (22).
L'invention concerne une installation de soufflage (10) d'un fluide sous pression dans une ébauche (12) qui comporte : - un moule (12) qui est destiné à loger l'ébauche (12), et qui comporte une paroi supérieure (24) à travers laquelle fait saillie un col (16) de l'ébauche (12) ; - une tuyère (22) qui comporte un orifice inférieur de sortie (34) du fluide sous pression, et qui comporte un joint annulaire d'étanchéité (40) qui est agencé sous le pourtour (44) inférieur de l'orifice de sortie (34) ; du type dans lequel le pourtour (44) de l'orifice de sortie (34) est destiné à entourer le col (16) de l'ébauche (12), caractérisée en ce que le joint d'étanchéité (40) comporte une lèvre annulaire inférieure (48) souple de manière que le fluide sous pression appuie sur une face supérieure (54) de la lèvre (48) pour plaquer le bord circulaire intérieur libre (58) de la lèvre annulaire (48) contre une paroi d'appui (18, 24) pour assurer l'étanchéité de la tuyère (22).
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Smart & Biggar
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