Double-walled structure and connection arrangement

  • US 6,543,575 B1
  • Filed: 06/14/2000
  • Issued: 04/08/2003
  • Est. Priority Date: 06/14/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. A double-walled structure, having at least one connection end portion, comprising:

  • an inner tube having a free end at said connection end portion of the structure;

    an outer casing spaced from and enclosing said inner tube and having a free end at said connection end portion of the structure;

    a filler material provided between said inner tube and said outer casing; and

    a resilient sealing ring means provided between said inner tube and said outer casing, wherein said sealing ring means fills out the space between said end portion of the inner tube and a portion of the outer casing opposite thereto, wherein only the outer casing free end defines said connection end portion of the structure for slip fit connection to another double-walled structure, and wherein the sealing ring means has a portion protruding beyond said free end of the inner tube.

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