U.S. patent number 3,785,364 [Application Number 05/259,778] was granted by the patent office on 1974-01-15 for smooth top range.
This patent grant is currently assigned to Columbia Gas System Service Corporation. Invention is credited to George W. Myler, Edward A. Reid, Jr., Robert G. Venendaal.
United States Patent |
3,785,364 |
Reid, Jr. , et al. |
January 15, 1974 |
SMOOTH TOP RANGE
Abstract
In a smooth top gas range including a shell construction
defining an open top, a plate of heat resistant glass material
closes the top of the shell to enclose a plurality of gas burner
units therein. An air-impervious plate separates the shell into
upper and lower air flow chambers and means is provided in the
upper chamber to confine the products of combustion formed by each
of the burners and isolate them from the upper chamber. The
confining means serves to direct the products of combustion into
the lower chamber of the shell construction which communicates with
the atmosphere through an opening in the shell, so that the lower
chamber defines a common exhaust for the products of combustion
formed in each of the burner units. A blower is provided for
drawing air into the upper chamber of the shell construction in
order to cool the smooth top heat resistant plate during operation
of the range and discharges this air into the lower chamber in
order to dilute the products of combustion therein prior to their
being discharged from the shell.
Inventors: |
Reid, Jr.; Edward A. (Columbus,
OH), Venendaal; Robert G. (Columbus, OH), Myler; George
W. (Columbus, OH) |
Assignee: |
Columbia Gas System Service
Corporation (Wilmington, DE)
|
Family
ID: |
22986341 |
Appl.
No.: |
05/259,778 |
Filed: |
June 5, 1972 |
Current U.S.
Class: |
126/39J |
Current CPC
Class: |
F24C
3/047 (20130101); F24C 15/101 (20130101) |
Current International
Class: |
F24C
3/00 (20060101); F24C 3/04 (20060101); F24c
003/04 () |
Field of
Search: |
;126/39,214R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Favors; Edward G.
Attorney, Agent or Firm: Stults; Harold L.
Claims
What is claimed is:
1. In a gas range, the combination of, a shell construction
defining a cavity having an open top, a relatively flat
air-impervious plate mounted in said shell and separating the shell
into separate upper and lower air flow chambers, said plate having
an opening therein providing communication between said chambers, a
gas burner unit mounted in said lower chamber and extending
upwardly through said opening into said upper chamber in spaced
relation to the periphery of said opening to define an air flow
passage between said upper and lower chambers, means in said upper
chamber surrounding said burner for isolating said burner from the
remainder of said upper chamber and confining products of
combustion produced by said burner units to prevent them from
flowing into said upper chamber, means forming a plate of heat
resistant material mounted in said shell to close the top of said
cavity, said heat resistant plate having a bottom surface
cooperating with said confining means to confine the combustion
products therein from flowing upwardly, said shell having a first
opening therein providing communication between said upper chamber
and the atmosphere and a second opening therein providing
communication between said lower chamber and the atmosphere, an air
and combustible gas assembly including means for supplying air and
combustible gas to said burner, and blower means for drawing air
through said first opening and supplying said air to said assembly,
whereby products of combustion produced by said burner and confined
by said confining means flows through said air flow passage and are
discharged from said lower chamber through said second opening.
2. In a gas range as defined in claim 1 wherein said plate has a
plurality of openings therein, a separate gas burner unit mounted
in said lower chamber and respectively extending upwardly therefrom
through said openings, and confining means surrounding each of said
openings and cooperating with the bottom surface of said plate to
confine combustion products from said burners from flowing
upwardly, whereby the products of combustion from all of said
burners flows from said confining means into said lower chamber for
common discharge through said opening.
3. In a gas range as defined in claim 1 wherein said blower
includes a pair of discharge openings, one of said openings
communicating with said lower chamber to supply a portion of said
air thereto for diluting said combustion products prior to
discharge from said shell, the remainder of said air flowing
through the other of said blower openings, and means for directing
the air discharged from said other opening to said assembly.
4. In a gas range as defined in claim 3 including means for
supporting said burners above the base of said lower chamber and
separating said chamber into two communicating sections, said one
discharge opening in said blower supplying air to each of said
sections to cool the base of said shell.
5. A gas range comprising, a shell construction defining a cavity
having an open top, a relatively flat air-impervious plate mounted
in said shell and separating the shell into separate upper and
lower air flow chambers, said plate having a plurality of openings,
a plurality of gas burner units mounted in said lower chamber and
respectively extending upwardly therefrom through said openings
into said upper chamber in spaced relation to the periphery of
their associated openings to define an air flow passage between
each of said burner units and their associated opening for
communication between said upper and lower chambers, means in said
upper chamber associated with each of said openings for enclosing
said burners and isolating them from the remainder of said upper
chamber, means forming a flat plate of heat resistant material
mounted in said shell to close the top of said cavity and said
upper chamber, said plate having a bottom surface cooperating with
said confining means to prevent combustion products produced by
said burner units from flowing upwardly, said shell having a first
opening therein providing communication between said upper chamber
and the atmosphere and a second opening therein providing
communication between said lower chamber and the atmosphere, an air
and combustible gas assembly having means for selectively supplying
air and a combustible gas to the individual burner units including
separate air valves associated with each of said burner units, said
air valves being normally open to permit air flow to said burners
when the burners are not operating and blower means for drawing air
through said first opening into said upper chamber and for
supplying said air to said assemblies, whereby products of
combustion produced in the burner units are confined by said
confining means and flow through said air passages for discharge
through said second openings while air is simultaneously supplied
to any non-operative burner unit for flow through its associated
air flow passage to cool said heat resistant plate and aid in
diluting said combustion products in said lower chamber prior to
discharge through said second opening.
6. The gas range as defined in claim 5 wherein said heat resistant
plate is formed of a heat resistant ceramic material which
transmits heat by conduction.
7. The gas range as defined in claim 6 wherein said gas burners
include burner elements for producing infrared radiation.
8. The gas range as defined in claim 5 wherein said blower includes
a pair of discharge openings, one of said openings communicating
with said lower chamber to supply a portion of said air thereto for
diluting said combustion products, the remainder of said air
flowing through the other of said blower openings and means for
directing the air discharged from said other opening to said
assembly.
9. The gas range as defined in claim 8 including means for
supporting said burners above the base of said lower chamber and
separating said chamber into two communicating sections, said one
discharge opening in said blower supplying air to each of said
sections to cool the base of said shell.
10. The gas range as defined in claim 8 wherein said confining
means comprises means forming a peripheral wall about each of said
openings, said wall extending from said air-impervious plate to
said bottom surface of said heat resistant plate and means forming
an airtight seal between said wall and said heat resistant
plate.
11. The gas range as defined in claim 10 wherein said shell
construction includes front and rear walls and said second opening
is located therein adjacent said rear wall.
12. The gas range as defined in claim 10 wherein said front wall
includes a forwardly extending portion adjacent said upper chamber
having a downwardly facing ledge portion, said first opening being
located in said ledge.
13. The gas range as defined in claim 12 wherein said blower is
located adjacent said front wall.
14. The gas range as defined in claim 13 including means forming a
separate chamber in said shell for containing said air and
combustible gas assembly, said assembly including individual supply
ducts extending from said separate chamber to respective burner
units to deliver said air and combustible gas mixture thereto, a
gas discharge nozzle located in spaced relation to and
substantially coaxially of the end of each of said ducts in said
separate chamber whereby gas discharged from said nozzles entrains
air flowing through said valves to project the gas and entrained
air through said supply ducts.
15. The gas range as defined in claim 14 wherein said air valves
each comprising a housing in said chamber enclosing the end of its
associated supply duct and having an air inlet opening therein and
means for selectively and variably blocking said opening to vary
the amount of air supplied to said housing, said last mentioned
means leaving said opening substantially unobstructed when its
associated burner is shut off and said nozzles extending into said
housing to entrap air passing through said valves.
16. The gas range as defined in claim 15 wherein said means for
directing the air discharged from said other blower opening
comprises an air supply duct between said blower and said separate
chamber.
17. In a smooth top gas range including a shell construction
defining an open top, a plate of heat resistant material closing
said top, and a plurality of gas burner units mounted in said shell
for transmitting heat through said plate, the improvement which
comprises means separating said shell into upper and lower
chambers, means for confining products of combustion formed by said
burner units between said burners and said plate, said confining
means isolating said combustion products from said upper chamber
and directing them into said lower chamber, said shell construction
having an opening therein providing communication between the
atmosphere and said lower chamber, whereby said lower chamber
defines a common exhaust chamber in said shell construction for the
products of combustion formed in said burner units, and means for
drawing air into said upper chamber to cool said plate and
discharging said air into said lower chamber to dilute said
products of combustion prior to discharge through said opening.
18. In a smooth top gas range including a shell construction
defining an open top, a top plate of heat resistant material
closing said open top, and a plurality of gas burner units mounted
in said shell for transmitting heat through said top plate, the
improvement which comprises means for confining products of
combustion formed by each of said burner units to spaces directly
above the respective burner units, means for forming a common
discharge chamber in the lower portion of said shell in
communication with said spaces above the burners through which said
products of combustion are directed from said burner units and
having a discharge opening from said discharge chamber to the
atmosphere, and air circulating means for circulating air along the
bottom of said plate around said burner units and thence into said
discharge chamber to dilute said products of combustion and for
directing air through each of said burner units immediately after
the discontinuance of use of the burner unit to thereby cool the
burner unit and the adjacent portion of said top plate.
Description
The present invention relates to gas ranges or stoves and more
particularly to smooth top gas ranges.
A number of smooth top gas ranges have been previously proposed in
which individual gas burner units for the range are contained
within a shell construction having a smooth top defined by a heat
resistant glass plate that is adapted to transmit heat for cooking
by conduction or infrared radiation. While such ranges have been
found to be satisfactory, a number of difficulties still arise with
them, particularly with respect to their manufacture and use.
For example, a particular problem which must be dealt with in
smooth top gas ranges is the fact that the products of combustion
of the burners are not exhausted directly to the atmosphere as with
conventional gas ranges but must be conducted beneath the heat
resistant smooth top of the range to a point of discharge
therefrom. Since it is desirable to keep the top of the range cool
at all times, except of course directly above the gas burner units
when in use, prior ranges were provided with numerous and often
complicated ducting systems for removing the products of combustion
from the range. In fact, it is typical for each separate burner to
have its own individual discharge duct, which often must be bent in
a circuitous path to reach the exhaust flue of the surrounding
shell. The provision of separate ducts for each of the gas burners
represents a substantial and undesirable cost in additional
material and labor in the manufacture of the gas range,
particularly because of the fact that each of the ducts will
normally have a different length depending upon its location in the
gas range.
With previously proposed smooth top gas ranges, the products of
combustion are normally exhausted directly from the exhaust duct or
flue into the atmosphere with little or no dilution of the
combustion products prior to discharge from the range. As a result,
relatively high temperature gases are exhausted directly into the
kitchen area surrounding the range so that the conditions in the
surrounding area are sometimes rendered uncomfortable. As a result,
exhaust fans are often required to overcome this problem, thereby
requiring an additional expenditure.
Moreover, previously proposed smooth top ranges have not been
totally successful in maintaining the portions of the top
surrounding the burners completely cool during operation of the
range since the exhaust duct for the products of combustion often
are located near the underside of the top so that heat is
transmitted to the top by convection and conduction. It also is
desirable to rapidly cool down the burner area of the smooth top
range after the cooling operation is completed with that selected
burner, however, with prior smooth top ranges the burners merely
cool to the ambient temperature without any assistance. Therefore,
the cooling time for the burners is relatively long and the top of
the range remains hot for an extended period of time. This is an
undesirable feature in smooth top ranges and one which is sought to
be overcome by the present invention.
Accordingly, it is an object of the present invention to maintain
the top of a smooth top range, surrounding the operating burners
therein, relatively cool during and after the cooling
operation.
Yet another object of the present invention is to rapidly cool down
the gas burners in a smooth top range after the burners have been
shut off.
Yet another object of the present invention is to dilute the
products of combustion from the gas burners in a smooth top range
with a substantial amount of cool air prior to discharge of the
products from the range into the surrounding atmosphere.
A further object of the invention is to provide a common exhaust
for the products of combustion from each of the burners in a smooth
top range, thereby to eliminate the use of separate exhaust ducts
from each of the individual burners.
In accordance with an aspect of the present invention a smooth top
gas range is provided which is formed from a shell construction
that defines a cavity having an open top. A relatively flat
air-impervious plate is mounted in the shell construction to
separate the shell into separate upper and lower air flow chambers
and has a plurality of openings therein, corresponding in number to
the number of gas burners utilized in the range. Each of the gas
burners is mounted in the lower chamber of the shell construction
and they respectively extend upwardly therefrom through the
individual openings in the separation plate into the upper chamber,
in spaced relation with the periphery of their associated openings,
thereby to define air flow passages between the burner units and
their associated openings to provide communication between the
upper and lower chambers in the shell construction.
A relatively flat plate of heat resistant material is mounted in
the shell construction to close the top of the cavity and this
plate cooperates with a wall arrangement surrounding each of the
burners to confine the products of combustion formed in the burners
directly above the burners and to isolate them from the remainder
of the upper chamber. As a result the products of combustion are
prevented from flowing upwardly and are caused to flow through the
air flow passages between the burner units and their associated
openings into the lower chambers of the shell construction.
The range has a first opening in its shell which provides
communication between the lower chamber and the atmosphere. An air
and combustible gas assembly, including means for selectively
supplying air and a combustible gas mixture to the individual
burners is mounted in the shell construction, with a separate air
valve being associated with each of the burner units. These air
valves are normally open to permit air flow to the burners when the
burners are not operating. Blower means mounted in the shell
construction draws air through the first opening therein into the
upper chamber in order to provide a cooling air flow along the
bottom surface of the heat resistant plate which will maintain
those portions of the plate surrounding the individual burners in a
relatively cool condition even when the burners are operating. The
blower supplies this air through a first opening therein to the air
and combustible gas assemblies so that air is simultaneously
supplied to all of the burner units even when the units are not
operating. In this manner, a burner which has been shut off will
still be supplied with air from the blower in order to cool down
the portion of the heat resistant plate directly above the burner
in a relatively rapid manner. In addition the blower, through a
second opening therein, discharges a portion of the air drawn into
the shell construction through the upper chamber into the lower
chamber in order to dilute the products of combustion discharged
into the lower chamber from the burners before these products are
exhausted from the shell construction through the second opening
therein.
The above, and other objects, features and advantages of this
invention will be apparent in the following detailed description of
an illustrative embodiment thereof which is to be read in
connection with the accompanying drawings, wherein:
FIG. 1 is a perspective view, with parts broken away, of a smooth
top gas range constructed in accordance with one embodiment of the
present invention;
FIG. 2 is a plan view with the top removed, of the gas range
illustrated in FIG. 1;
FIG. 3 is a sectional view taken along line 3--3 of FIG. 2; and
FIG. 4 is a sectional view taken along line 4--4 of FIG. 1.
Referring to the drawing in detail, and initially to FIG. 1
thereof, a flat or smooth top range 10 embodying the present
invention is formed in a generally rectangular configuration from a
shell construction 12 and contains a plurality of gas burner units
14 therein, enclosed by a smooth top 16.
Shell 12 may be constructed of sheet metal in any convenient manner
and defines a cavity 18 having an open top 20 which is closed by
smooth top 16. The latter, in the illustrative embodiment is formed
from four individual plate members 22 of heat resistant glass or
ceramic material which are supported in the top of the shell 12 on
a plurality of rigid frame members 24 secured to the shell. The
individual plates 22 are supported on frame members 24 by a
plurality of screws 25 which cooperate between frame members 24 and
angular metal seal strips 26, extending along the edges of the
plates, to clamp the plates between screws 25, inwardly extending
lip 27 of the shell and upper cross frame members 28. In addition
the plates may be sealed in air tight relation to each other and to
shell 12 by gaskets (not shown).
It is noted that while the illustrative embodiment an individual
plate 22 has been provided in association with each of the burners
14, it is contemplated that a signal ceramic or glass heat
resistant plate can be utilized in the conventional manner to
simultaneously cover each of the burners. Thus, the term "heat
resistant plate" as utilized herein is intended to encompass a
smooth top formed from a plurality of plates, as in the
illustrative embodiment, or a single plate provided in the
conventional manner.
Shell 12 includes a front wall 29 and a rear wall 30 formed
therein. Front wall 29 is formed with a forwardly extending ledge
portion 32 having a bottom surface 34 provided with a plurality of
openings 36 through which air is drawn, as more fully described
hereinafter, to maintain top 16 in a relatively cool condition
during operation of the range. On the other hand, rear wall 30 is
provided with an opening 38 formed at its upper edge through which
the products of combustion in the gas burners are discharged into a
back plate or exhaust flue 40, rigidly secured to wall 30.
Substantially all of cavity 18 is separated into upper and lower
chambers 42, 44 respectively by an air-impervious plate 46 rigidly
secured to shell 12 by welding or the like. Plate 46 has a
plurality of openings 48 formed therein and respectively associated
with each of the burners 14. The latter are supported above the
base 50 of shell 12 by a plate 51, for reasons more fully described
hereinafter, and extend upwardly through the openings 48 in plate
46 into upper chamber 42.
Each of the burner units 14 includes a plenum chamber 52 at its
bottom to which a mixture of gas and air is delivered through a
supply duct 54, for combustion in burner element 56 contained in
the burner. These burners may be of conventional blue flame type,
to transmit heat by conduction through the glass plates 22 or
alternatively, they may be infrared type burners, such as are
disclosed in U.S. Pat. No. 3,470,862, so that products placed on
the range are heated by infrared radiation passing through plate
22. In either case, the products of combustion formed in burners 14
are confined above the burners within a predetermined area by
cylindrical wall members 58 secured to plate 46 about the periphery
of openings 48.
Cylindrical walls 58 are maintained in substantially airtight
relationship to the bottom surface 60 of plate 22 by gaskets 62 in
any convenient manner, as would be apparent to those skilled in the
art. Thus, the products of combustion formed in burners 14 are
confined within the cylindrical walls 58, directly above the
burners 14 and are isolated from the remainder of the upper chamber
42. The products of combustion are discharged from their
confinement by walls 58, through the air flow passages 64 defined
between the burners and the edges of openings 48, into the lower
chamber 44. Accordingly, it is seen that the only portions of plate
22 which are heated by the products of combustion, or by infrared
radiation, are those portions thereof directly above the burners 14
and within the confines of the isolating walls 58 associated with
each of the burners.
The air and combustible gas mixture delivered to burners 14 through
ducts 54 is supplied from an assembly 66 mounted within shell 12
and isolated from upper and lower chambers 42 and 44 by an
air-impervious wall 68. Ducts 54 each extend through an associated
aperture 70 in wall 68 into a valve assembly 72. This assembly
includes a gas discharge nozzle 74 which receives gas from a supply
pipe or manifold 76 in a conventional manner. Nozzles 74 are spaced
from and coaxially aligned with the ends 78 of their associated
ducts 54, so that gas discharged from the nozzles cooperates with
the open ends 78 of the ducts to act as a venturi assembly by which
the gas entrains the desired amount of air to support proper
combustion in burners 14.
The air supplied to duct 54 is controlled by a separate air valve
arrangement 80 in valve assembly 72. This valve arrangement
includes a separate airtight housing associated with each of the
ducts 54 and respectively secured in airtight relation to wall 68.
Housing 82 includes a generally rectangular opening 84 therein
which permits passage of air from the chamber 86 (in which the
assembly 66 is mounted) into the housing for entrainment by the jet
of gas discharged into nozzle 74. The volume of air permitted to
pass through openings 84 is controlled by a separate vane or valve
88 associated with each of the openings and having an irregular
configuration, seen most clearly in FIG. 2.
In the illustrative embodiment of the invention the position of
vanes 88, and the volume of gas discharged from nozzle 74, are
simultaneously controlled by a rotatably mounted control knob 90 on
the top surface 92 of the gas range. Vane 88 is rigidly mounted on
a rotatable shaft 94 connected to knob 90, and shaft 94 is, in
turn, integrally connected to a valve arrangement 96 which controls
the gas supply from manifold 76 to nozzle 74.
In the closed position of knob 90, illustrated at the lowermost
vane 88a in FIG. 2, opening 84 is partly exposed. When the range is
turned on, knob 90 is turned to its fully opened position,
illustrated at the uppermost vane 88d in FIG. 2, and adjustment of
the air and gas supplied to the burners is then accomplished by
rotating the knob back to its fully closed position, as illustrated
by the two intermediate vanes 88c and 88d. Thus when any of the
burners 14 is shut, air can be supplied to its duct 54 for passage
through its burner, without gas, for reasons more fully decribed
hereinafter.
In order to supply air to assemblies 66, an electrically operated
blower 100 is mounted within shell 12 adjacent front wall 28.
Blower 100 extends through plate 46 in airtight relation therewith
and, in operation, draws ambient air through openings 36 in ledge
34. This air is relatively cool and serves to maintain those
portions of plate 22 surrounding confining walls 58 in a relatively
cool condition so that during operation of the range only the
portions of the plate directly above burners 14 and within the
confines of wall 58 are heated.
Blower 100 is surrounded by an air-impervious housing 102 in lower
chamber 44 and this housing has a pair of openings 104 and 106
therein for discharging the air drawn into chamber 42. A portion of
this air is discharged through opening 104 and is supplied through
a duct 107 (FIGS. 2 and 3) to chamber 86, in order to provide air
for air and combustible gas assemblies 66. The remainder of the air
from blower 100 is discharged through opening 106 in housing 102
directly into chamber 44 in order to dilute the products of
combustion which are discharged from the burners 14 into this lower
chamber. In this manner, the products of combustion are cooled and
diluted prior to their discharge through openings 38 in shell
12.
In addition, a portion of the air discharged through opening 106 is
supplied below plate 51 since that plate extends across opening
106, as seen in FIG. 4. Plate 51 is supported above shell base 50
by frame members 105 so as to define a secondary chamber 109 below
burners 14. The plate extends to within approximately one inch of
the front, rear and side walls of shell 12 so as to define air
passageways 111 providing communication between secondary chamber
109 and the remainder of chamber 44. In this manner, relatively
cool air is supplied below the burners 14 to keep shell base 50
cool. This air then flows through passageways 111 and is discharged
with the products of combustion through shell opening 28.
Blower 100 is controlled by the actuation of any of the knobs 90
and turns on as soon as any one of the knobs is turned to start one
of the burners. In one contemplated embodiment of the invention,
the range can be provided with a control system which will
automatically turn the blower 100 on prior to the discharge of gas
from nozzle 74. Once the blower has reached its operating speed, as
determined by an air flow switch, a solenoid valve 110 in manifold
76 is operated to permit gas to flow from the main line into the
manifold for discharge through the nozzle 74 which has been opened
by the operated knob 90.
Burner units 14 are preferably provided with electric igniters,
e.g. a glow coil, which will automatically turn on with the
operation of knob 90 and in order to reduce the amount of controls
required, it is contemplated that each of the igniters will be
turned on by operation of any one of the knobs 90. Since gas will
flow only to the burner associated with the operation of the knob,
the ignition of the igniters presents no problem and the igniters
will automatically turn off after a predetermined time delay, in
the conventional manner. Thereafter, the gas supplied from manifold
76, upon actuation of the valve 100, causes entrainment of air
flowing through the opening 84 associated with the operated valve
90 to entrain the air and supply it through duct 54 to the plenum
chamber 42 of the burner 14 for ignition.
It is thus seen, that upon actuation of blower 100, and ignition of
any one of the burners 14, air is simultaneously supplied through
the openings 84 in the valve housings 82 of each of the burners 14,
even if they were not turned on. This air, because it is under
pressure by the operation of blower 100, flows through openings 84
and through their associated ducts 54, into each of the burners 14,
and serves to maintain the upper surface of the heat resistant
plate above the burners relatively cool. This air passes through
passages 64 into lower chamber 44, to further dilute the products
of combustion. Moreover, when more than one burner has been in use
and one of them is shut off, the air is continuously supplied to
that burner after it is shut off, so as to rapidly cool down the
plate 22 immediately above it. Accordingly, the heat in the plate
is removed by this relatively cool air and discharged through lower
chamber 44 to exhaust opening 38. This is a particularly important
feature of the invention since with smooth top ranges, after the
burners in the smooth top range are shut off, it is often difficult
to determine whether or not the surface is warm. Thus, the rapid
cooling substantially reduces the danger of having the person
utilizing the stove burned by contact with the warm smooth top.
In addition, it is comtemplated that an electronic timer or
thermostatic control for blower 100 can be provided so that after
all of the burners 14 are shut off the blower 100 will remain in
operation for a predetermined time period in order to rapidly cool
down the entire surface of the plate 22. This is permitted by the
valve arrangement illustrated in FIG. 2 in which the openings 84
remain open when the range is shut off. As a result, the air from
blower 100 can be continuously supplied through the burners, and
discharged through lower chamber 44 to the atmosphere, even with
the burners are off.
Accordingly, it is seen that a relatively simple and inexpensively
constructed smooth top range is provided which has numerous
constructional advantages that serve to maintain the top of the
range as cool as possible during and after operation of the device.
This is accomplished by the provision of a common exhaust in the
lower portion of the range for the products of combustion of each
of the burners while continuously supplying coll air to the upper
portion of the range to cool the smooth top surrounding the
burners. In addition, because of the novel air supply system
utilized in this arrangement, air is continuously supplied to each
of the burners when they are not in operation in order to keep the
plate above the burners cool and to cool the plate after the
burners have been shut off.
Although an illustrative embodiment of the present invention has
been described herein with reference to the accompanying drawings,
it is to be understood that the invention is not limited to that
precise embodiment and that various changes and modifications may
be effected therein by one skilled in the art without departing
from the scope or spirit of this invention.
* * * * *