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Method and apparatus for heat bonding

  • US 3,996,091 A
  • Filed: 09/11/1974
  • Issued: 12/07/1976
  • Est. Priority Date: 09/11/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus for making a substantially rigid heat bonded article from a plurality of cooperating members comprising:

  • a rigid backing member including a workpiece cavity therein having a rigid article receiving surface;

    a rigid top member adapted for pivotal movement with respect to the backing member;

    a flexible heating blanket comprising a flexible, resilient rubber-like material having embedded therein an electric resistance heater, the blanket being preshaped to reflect contour of the article to be made, being positioned in spaced apart relationship with the article receiving surface, and being adapted to contact and to provide heat to at least one of the cooperating members of the article; and

    fluid pressure means comprising a resilient sponge member having a plurality of discrete cells closed one from another to retain in each compartment a compressible fluid, the fluid pressure means being carried by the top member and including a pressure transmitting surface for location in juxtaposition with the workpiece cavity when the top member is pivoted toward the backing member to press toward one another the heating blanket and the article receiving surface.

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