Electric heating – Microwave heating – Field modification
Reexamination Certificate
2000-08-21
2002-10-22
Leung, Philip H. (Department: 3742)
Electric heating
Microwave heating
Field modification
C219S754000, C219S756000, C219S757000, C219S762000
Reexamination Certificate
active
06469287
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a combination ventilated hood and microwave oven, and more particularly, to a combination ventilated hood and microwave oven having a plurality of trays by which a large quantity of food is cooked at the same time.
2. Description of the Background Art
A general combination microwave oven and ventilated hood has a function of suctioning steam and smoke generated during the operation of a gas oven range positioned at a lower portion of the microwave oven.
The interior of a combination ventilated hood and microwave oven in the conventional art, as illustrated in
FIG. 1
, includes a cavity
102
, which is a cooking space for cooking foodstuffs by microwaves oscillated from a magnetron
106
. Usually, since the cavity
102
of the combination ventilated hood and microwave oven is installed across the width of an upper portion of the gas oven range, the horizontal length L of the cavity
102
is large as compared to the general stand alone microwave oven. Also, an exhaust motor
104
is installed in the cavity
102
to exhaust steam and smoke.
At the bottom surface of the cavity
102
, a circular rotary tray
108
for putting foodstuffs to be cooked on the top surface thereof, is installed. In addition, a rotary tray mounting unit
107
is connected to a lower portion of the rotary tray
108
so that the rotary tray
108
is mounted for rotation.
The rotary tray mounting unit
107
is positioned at the bottom surface of the cavity
102
and includes a driving source
103
with a power transmission device for rotating the rotary tray
108
.
However, in the conventional combination ventilated hood and microwave oven, the rotary tray
108
is installed at the center portion of the bottom surface of the cavity
102
, and the rotary tray mounting unit
107
for rotating the rotary tray
108
is also installed at a lower side of the center portion of the bottom surface of the cavity
102
.
Namely, in the conventional ventilated hood and microwave oven, although the horizontal length L of the cavity
102
is large as compared to the general microwave oven, the rotary tray
108
is mounted at the central portion of the cavity
102
in the same manner as the general microwave oven.
Therefore, in the conventional microwave oven and ventilated hood, the right and left side portions of the rotary tray in the cavity are not used as a cooking space. Also, although the size of the inner space of the cavity is large as compared to the general microwave oven, the actual space for putting foodstuffs thereon for cooking purposes has the same size as the general microwave oven, resulting in an inefficient use of the cooking space.
Meanwhile, as illustrated in
FIG. 2
, another microwave structure according to the conventional art is disclosed. The structure includes a first tray
210
and a second tray
220
each having a smaller size than the above-described rotary tray. The first tray
210
is installed at one side of the rotary tray (not shown) and the second tray
220
is installed on the other side of the rotary tray. Both the first tray
210
and the second tray
220
are to be driven by a motor
330
for driving the rotary tray.
Also, the structure includes a main gear
201
connected to the motor
330
for driving the rotary tray; a first slave gear
211
for driving the first tray
210
engaged with the main gear
201
; a second slave gear
221
for driving the second tray
220
is engaged with the main gear
201
and opposite the first slave gear
211
; and the axis of the motor
310
extends from the motor through the main gear
201
. Further, although not shown, the structure has a third tray.
However, although the above-described structure can have three trays, the rotary tray alone is driven during actual operation of the microwave oven. As illustrated in
FIG. 2
, only the first tray
201
and the second tray
202
must be driven in a state where the rotary state is escaped to the outside of the main frame. Consequently, there occurs a problem that the manufacturing cost is increased, and the space of a cooking chamber is not efficiently used.
Meanwhile,
FIG. 3
illustrates still another structure according to the conventional art. The structure includes a stirrer fan
312
driven by the motor
307
is installed at one side of the rotary tray
305
, and a base plate
319
on which a container
318
for containing a temperature probe
320
can be put on is installed at an upper side of the stirrer fan
312
. Thereby, it is possible to simultaneously carry out cooking using the rotary tray
305
and cooking using the temperature probe
320
.
The driving structure of the stirrer fan
312
driven by the motor
307
will now be described. The rotating shaft
306
of the rotary tray
305
is connected to the rotating shaft
308
of the motor
307
. A pulley
314
fixed to the rotating shaft
313
of the stirrer fan
312
and a pulley
315
fixed to the rotating shaft
308
of the motor
307
are connected with a belt
316
, thereby making it possible for the stirrer fan
312
to be driven by the motor
307
.
In addition, a wave guide
317
for transmitting microwaves generated from the magnetron
309
to the stirrer fan
312
is installed at one side wall of the cavity
302
, while a shelf-shaped base plate
319
for putting the temperature probe
320
on the top surface thereof is positioned at an upper side portion of the stirrer fan
312
at one side of the rotary tray
305
. Reference numeral
321
designates a bracket for fixing the motor.
However, in addition to the wave guide
310
installed at an upper portion of the cavity
302
, the wave guide
317
has to be installed in order to transmit microwaves to the stirrer fan
312
positioned at a lower portion of the cavity
302
. Thus, the wave guide must be longer and accordingly increases the manufacturing cost.
In addition, the bottom surface of the base plate
319
is positioned higher, than the bottom surface of the rotary tray
305
. Thus, making it inconvenient to clean the microwave oven and aggravating the aesthetic appearance of the microwave oven.
In addition, since the pulleys and belt are required for driving the stirrer fan, the manufacturing cost is increased. In particular, the diameter ratio of the pulley fixed to the rotating shaft of the motor for properly rotating the stirrer fan for cooking purposes to the pulley fixed to the rotating shaft of the stirrer fan must be increased, thus making the manufacturing process complicated and increasing the manufacturing cost.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a combination ventilated hood microwave oven having a plurality of trays and able to cook a large quantity of food at one time by making the most of a cooking space of the combination ventilated hood and microwave oven.
It is another object or me present invention to provide a combination ventilated hood and microwave oven having a plurality of trays by which microwaves supplied into a cavity can be uniformly penetrated through foodstuffs to be cooked.
To achieve the above objects, there is provided a combination microwave oven and ventilated hood having a plurality of trays which includes: a stirrer fan installed at an upper portion of the cavity at which the plurality of trays are installed; a coding fan installed at an upper portion of a machine chamber formed at one side of the cavity; and a guide unit for guiding parts of an airflow generated from the cooling fan towards the stirrer fan. Additional advantages, objects and features of the invention will become more apparent, from the description which follow.
REFERENCES:
patent: 3991295 (1976-11-01), Akiyoshi
patent: 4286134 (1981-08-01), Nakata et al.
patent: 4296297 (1981-10-01), Miller
patent: 4334137 (1982-06-01), Takagi et al.
patent: 4743728 (1988-05-01), Nagafusa
patent: 6013909 (2000-01-01), Aramaki et al.
patent: 52-11442 (1977-01-01), None
patent: 53-122948 (1978-10-01), None
patent: 53-148748 (1978-12-01), None
pa
Leung Philip H.
LG Electronics Inc.
LandOfFree
Combination ventilated hood and microwave oven does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combination ventilated hood and microwave oven, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combination ventilated hood and microwave oven will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2997457