Pipe joints or couplings – Elbow – Sheet metal
Patent
1998-02-27
1999-09-28
Arola, Dave W.
Pipe joints or couplings
Elbow
Sheet metal
285184, 285222, 2853345, 2853821, 2853824, 285424, 285 47, 29509, 2989014, F16L 4300
Patent
active
059575069
ABSTRACT:
A sheet-metal elbow is coupled by direct attachment to a flat sheet-metal air inlet panel of an air distribution boot or register box by roll-formed flange portions that are mated in interlocking, overlapping engagement with each other. The air inlet panel includes an outwardly flared coupling flange bordering an air inlet opening. The neck of the sheet-metal elbow includes a folded coupling flange that is dimensioned for interfitting, overlapping engagement with the outwardly flared elbow coupling flange. The coupling flanges are clasped together by a hydraulic ram that drives an expandable mandrel into a V-shaped die cavity. The tightly clasped, overlapping flange portions permit smooth, continuous rotation of the elbow through 360.degree. with respect to the register box for alignment with a branch conduit. The interlocked flanges also provide a strong mechanical union that is virtually leak-free under normal ventilation air flow conditions.
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Arola Dave W.
Griggs Dennis T.
M & M Manufacturing Co., Inc.
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