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Coupling ring and method of making same

  • US 5,213,374 A
  • Filed: 10/11/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 10/11/1991
  • Status: Expired due to Term
First Claim
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1. A coupling ring for receiving and joining circular air ducts comprising:

  • a single piece of sheet metal shaped to provide oppositely extending cylindrical flanges and a channel-shaped annular rib encircling the flanges at their proximal ends and connecting them together;

    axially outwardly opening grooves at opposite sides of the rib at the connection between the rib and flanges for receiving the ends of ducts into which the flanges are telescoped for connecting the ducts; and

    each flange being circumferentially crimped between said grooves and the distal end.

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