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Method for manufacturing a conveying element of an axial type flow meter used for drink vendors

  • US 7,117,595 B2
  • Filed: 12/16/2004
  • Issued: 10/10/2006
  • Est. Priority Date: 06/17/2002
  • Status: Expired due to Fees
First Claim
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1. A method for manufacturing a conveying element for an axial type flow meter comprising an impeller (46) having at least a blade (46A) extending from a hub (46B) to which a rotation pin (46C) is associated, and a conveying element (41) having a central core (42), a peripheral part (43) and one or more blades (45A, 45B) with a helical surface developing with at least a complete coil around said core (42), where the conveying element (41) has a profile and is made as one piece by molding a thermoplastic material, comprising the following steps:

  • providing a molding element (60, 70) defining an impression (61, 71) for the formation of at least a part of the profile of the conveying element (41), said impression (61, 71) forming a cavity;

    providing a male (75

    76) comprising one or more spiral plates (75, 76);

    positioning of said male (75

    76) in said cavity through a corresponding injection opening (72);

    injection of a fluid thermoplastic material into said cavity through said corresponding injection opening to form the conveying element therein;

    removal, after setting of the thermoplastic material, of the male (75

    76) from said cavity, by substantially unscrewing the male from the conveying element thus formed and moving the male backwards away from said cavity;

    extraction of the conveying element (41) thus formed from the molding element (60, 70).

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