Stoves and furnaces – Stovepipes – Ventilation
Reexamination Certificate
2000-07-21
2001-04-10
Yeung, James C. (Department: 3743)
Stoves and furnaces
Stovepipes
Ventilation
C126S30700R, C110S203000, C110S210000, C422S179000
Reexamination Certificate
active
06213118
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to vent tube assemblies for ovens including commercial cooking ranges.
BACKGROUND OF THE INVENTION
Currently, oven vent tube assemblies are made in two parts. A flanged tube is inserted through a hole in a wall of the oven chamber from the inside. The flange is secured to the wall with screws. The vent tube with a catalyst therein, is then placed over the flanged tube.
SUMMARY OF THE INVENTION
In accordance with the present invention, an integrated design is provided in which the flanged tube is eliminated. The vent tube is fitted over an extruded hole in the wall of the oven chamber. The catalyst is secured in the vent tube preferably by three or more abutments above and below the catalyst. The catalyst may be installed by inserting it into an open end of the vent tube to a position between the two sets of abutments.
The abutments may be in the form of flexible tabs lanced from the wall of the vent tube and bent toward the inside of the vent tube. The tabs nearest the open end of the tube may be deformed inwardly before or after insertion of the catalyst, but if deformed inwardly before insertion of the catalyst, the catalyst would have to press against and flex the tabs outwardly during insertion, risking damage to the catalyst.
Alternatively, the abutments may be in the form of dimples pressed from the wall of the vent tube toward the inside of the vent tube. The dimples would be flexible. The dimples nearest the open end of the tube maybe formed in the wall of the tube before or after insertion of the catalyst, but, as with the tabs, if formed in the wall of the tube before insertion of the catalyst, the catalyst would have to press against and flex outwardly or flatten the dimples during insertion, risking damage to the catalyst.
The present invention is a simple design which eliminates the flanged tube and is easy to manufacture and install. It is also much less expensive than the current design.
One object of this invention is to provide an oven vent tube having the foregoing features and capabilities.
Another object of the invention is to provide an oven vent tube which is rugged and durable in use, is relatively inexpensive, and can be easily manufactured and installed.
These and other objects, features and advantages of the invention will become more apparent as the following description proceeds, especially when considered with the accompanying claims and drawings.
REFERENCES:
patent: 3984207 (1976-10-01), Abthoff et al.
patent: 4158037 (1979-06-01), Ayoma
patent: 4248833 (1981-02-01), Aoyami
patent: 4373452 (1983-02-01), Van Dewoestine
patent: 4476852 (1984-10-01), Lee et al.
patent: 4550668 (1985-11-01), Piontkowski
patent: 4643862 (1987-02-01), Callahan
patent: 4667386 (1987-05-01), Enomoto et al.
Adcock Darrell
Taylor Kevin R.
Watson Tracy D.
Mills Products, Inc.
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
Yeung James C.
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