Pipe joints or couplings – Materials – Sheet
Reexamination Certificate
1998-10-19
2001-03-20
Browne, Lynne H. (Department: 3629)
Pipe joints or couplings
Materials
Sheet
C285S334200, C285S915000
Reexamination Certificate
active
06203074
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to duct systems for heating, cooling and ventilating applications.
2. Description of the Related Art
Many duct systems of the prior art require complicated connectors between components, having metal bands and gaskets, and requiring significant labor for installation. What is needed is a duct system which is quickly and easily installed.
SUMMARY OF THE INVENTION
The duct system of the present invention is constructed of plastic, similar to the material used for conventional, plastic potable water piping systems in buildings. Internal connectors are configured to conformingly fit within each of the mating ends of adjacent duct elements. The internal connectors each comprise a sleeve having an outwardly extended wall disposed about a perimeter of the sleeve. The mating ends each have a stepped face configured to conformingly mate with the internal connector.
To connect the duct elements together, the mating ends are mated to each side of the internal connector and the mating ends are glued to each other. Because the mating ends and the internal connectors conformingly mate with each other, the duct elements will be aligned with each other. The internal connectors are glued to a side wall of the duct element wherever branch take-offs are made.
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Brams J. Stewart
Browne Lynne H.
Dunwoody Aaron
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