Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
1998-08-11
2001-07-10
Pelham, Joseph (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S400000
Reexamination Certificate
active
06259063
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an oven with a cooking chamber and a cooling-air fan which is disposed outside the cooking chamber, has an intake opening and is connected to an exhaust duct that opens out into the free air.
Such an oven is known from German Utility Model G 88 06 276.7, in which a cooling-air fan of standard construction can be attached to a connection opening of the exhaust duct.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide an oven with a cooling-air fan, and a fan-holding part for an oven, which overcome the disadvantages of the heretofore-known devices of this general type and which reduce the cost of the cooling-air fan.
With the foregoing and other objects in view there is provided, in accordance with the invention, an oven, comprising a cooking chamber; a cooling-air fan disposed outside the cooking chamber; a motor for the cooling-air fan; an intake opening leading to the cooling-air fan; an exhaust duct leading from the cooling-air fan into open air; and a holding section associated with the exhaust duct and having a bearing plate for the motor.
As a result, it is possible to dispense with the use of a second bearing plate directly at the motor, which is otherwise required. Since the exhaust duct is at least partially made from plastic, the bearing plate can be realized in a particularly inexpensive manner using plastic.
In accordance with another feature of the invention, the holding section is constructed as a separate fan-holding part which can be attached to the exhaust duct. As a result, the assembly outlay can be reduced significantly in particular for axial-fan motors. It is now possible to completely preassemble the cooling-air fan with a fan wheel and to supply it as a complete, tested structural unit for installation in the oven. It is not necessary for the exhaust shaft to be made from a plastic which may be of a higher grade, in order to be able to perform the bearing function. It is rather only necessary for the fan-holding part to be made of such a plastic. Advantageously, the holding section including the fully assembled cooling-air fan may be attached to the exhaust duct by using latch-in connections without further effort.
In accordance with a further feature of the invention, the fan-holding part has a protective sleeve in which the fan wheel is rotatably accommodated. As a result, the fan wheel is protected during transport in a simple manner. In addition, the protective sleeve may also contribute to sealing a transition section between the fan-holding part and the exhaust duct. Additionally, an attachment device for attaching the exhaust duct to the oven may be provided on the fan-holding part.
In accordance with an added feature of the invention, in order to keep the structure of the exhaust duct/cooling-air fan unit as simple as possible while at the same time maintaining a variety of possible uses, the fan-holding part has, in addition to the intake opening, an auxiliary intake opening, through which air or the like can additionally be fed to a reduced-pressure region of the cooling-air fan. This can be utilized, for example, together with the cooling-air fan, to extract vapors from the cooking chamber when required and convey them through the exhaust duct into the free air.
In accordance with an additional feature of the invention, the fan-holding part is formed of a suitable plastic material, e.g. of thermoplastic polyester which is dimensionally stable up to approximately 200° C. In contrast, the exhaust duct may be produced, for example, from the less expensive ABS plastic.
With the objects of the invention in view, there is also provided a fan-holding part for use in such an oven.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in an oven with a cooling-air fan and a fan-holding part for an oven, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
Klement et al, DE 2846277 Patent Abstract, Apr. 30, 1980.
Lintner Kurt
Roch Klemens
BSH Bosch und Siemens Haus-geraete GmbH
Greenberg Laurence A.
Lerner Herbert L.
Pelham Joseph
Stemer Werner H.
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