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Fusion joining device for plastic tubes

  • US 7,015,421 B2
  • Filed: 12/19/2003
  • Issued: 03/21/2006
  • Est. Priority Date: 12/20/2002
  • Status: Active Grant
First Claim
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1. A fusion joining device for plastic tubes that heats a joint portion of plastic tubes for fusion joining the joint portion, comprising:

  • a fusion joining head for sandwiching said joint portion from both sides to heat the joint portion, whereinsaid fusion joining head comprises a pair of members for heat conduction, a pair of clampers, and a pair of heaters;

    said pair of members for heat conduction is disposed so as to be opposed to each other through said joint portion;

    said pair of clampers is supported to be pivoted between a closed position where said pair of clampers sandwiches said joint portion from both sides through said pair of members for heat conduction, and an open position where a spacing between said pair of members for heat conduction is widened; and

    said pair of heaters is made of a resistance heat generation material in a sheet shape, and is arranged along said pair of members for heat conduction, respectively, for heating said joint portion through the pair of members for heat conduction,a supporting head for removably supporting the fusion joining head, anda heating circuit for supplying power to the fusion joining head through the supporting head;

    whereinsaid supporting head supports the pair of clampers pivotably between the closed position and the open position;

    said heating circuit comprises a pair of head electrodes;

    one of said pair of head electrodes is provided on the fusion joining head;

    the other of said pair of head electrodes is provided on the supporting head;

    said pair of head electrodes is connected to each other when the fusion joining head is loaded onto the supporting head; and

    at least one of said pair of head electrodes is energized in a direction in which the one of the pair of head electrodes is connected to the other of the pair of head electrodes.

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