Coupling ring and method of making same
First Claim
Patent Images
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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Abstract
A coupling ring for circular ducts is formed of a single piece of sheet metal and has oppositely extending flanges connected together by an annular channel-shaped rib which cooperatively with the flanges defines oppositely opening grooves containing sealant. The relative dimensions of the grooves is such that a hydraulic lock is avoided at the time the coupling ring is telescoped onto the ducts. Proper sealing can be visually determined by inspection.
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Citations
13 Claims
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1. A coupling ring for receiving and joining circular air ducts comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making a coupling ring for receiving and joining circular air ducts comprising the steps of:
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providing an elongated strip of sheet metal having parallel lateral edges; forming said strip in a rolling mill to provide an elongated channel-shaped rib extending medially of the strip along the length thereof and disposed above and overhanging one face thereof and shaped to provide oppositely opening grooves beneath the rib; bending a length of the strip into annular configuration with the rib on the outside of the bend while simultaneously crimping the strip between the rib and the lateral edges of the strip; and joining the ends of said length of strip to make a continuous ring. - View Dependent Claims (12, 13)
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Specification