U.S. patent number 3,645,249 [Application Number 05/034,801] was granted by the patent office on 1972-02-29 for gas cooktop with integral burners.
This patent grant is currently assigned to General Electric Company. Invention is credited to Raymond L. Dills, Wayne L. Henderson.
United States Patent |
3,645,249 |
Henderson , et al. |
February 29, 1972 |
GAS COOKTOP WITH INTEGRAL BURNERS
Abstract
A gas cooktop that is provided with a plurality of integral
burners such that the cooktop may be hinged adjacent its rear edge
to an underlying support housing so that the cooktop may be raised
in the front for cleaning and servicing therebeneath. Each integral
burner has a burner opening in the cooktop and an annular pan
sealed about its inner and outer peripheries to the underside of
the cooktop to form a burner manifold. Downwardly inclined radial
gas ports are formed in the manifold to create a flame pattern
within the burner opening. A separate source of secondary air is
furnished beneath each burner and the air comes from all sides to
flow through the burner opening by using a partitioned cover plate
beneath the cooktop. A utensil-supporting grid is centered over
each burner and it has a central annular flame spreader and an
outer flame diverter to keep the cooktop from being overheated in
the area surrounding each burner.
Inventors: |
Henderson; Wayne L.
(Louisville, KY), Dills; Raymond L. (Louisville, KY) |
Assignee: |
General Electric Company
(N/A)
|
Family
ID: |
21878698 |
Appl.
No.: |
05/034,801 |
Filed: |
May 5, 1970 |
Current U.S.
Class: |
126/39H;
126/214R |
Current CPC
Class: |
F24C
15/10 (20130101) |
Current International
Class: |
F24C
15/10 (20060101); F24c 003/00 () |
Field of
Search: |
;126/39,39H,39N,39K,214,215 ;239/554,555,558 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
172,743 |
|
Dec 1921 |
|
GB |
|
114,204 |
|
Nov 1941 |
|
AU |
|
Primary Examiner: Myhre; Charles J.
Claims
What we claim as new and desire to secure by Letters Patent of the
United States is:
1. A gas cooktop supporting a plurality of integral surface
burners, said cooktop comprising a top cooking surface with a
burner opening for each of the surface burners, where the
peripheral edge of each burner opening is countersunk, a dished
annular plate positioned under each burner opening and having an
opening coinciding with the adjacent burner opening, said plate
being sealed adjacent its inner and outer periphery to the
underside of the cooktop to form a burner manifold, a combined gas
and primary air feed line connected to the burner manifold, the
peripheral edge of the opening in the annular plate being formed
with a plurality of spaced radial grooves which parallel the
countersunk peripheral edge of the burner opening to form
downwardly inclined radial gas ports that communicate with the
burner manifold and create a starlike flame pattern in the burner
opening.
2. A gas cooktop as recited in claim 1 with a utensil-supporting
grid centered over each burner, the center portion of the grid
including an annular flame spreader member located above the burner
opening for enlarging the overall size of the flame pattern beneath
a utensil while rendering the flame more uniformly distributed.
3. A gas cooktop as recited in claim 1 with a partitioned cover
plate positioned beneath the cooktop, said partitions forming a
shallow pan configuration under each burner, the sides of each pan
having air openings for delivering secondary air to the related
burner in a generally uniform pattern, such that the secondary air
supply to each burner is independent of the air supply of any other
burner, and hinge means along the rear edge of the cooktop
connecting the cooktop to the said cover plate whereby the cooktop
may be raised at the front for servicing and cleaning therebeneath,
an inlet gas manifold supported by the cooktop, a main gas line
connected to the inlet gas manifold, the said gas and air feed line
of each burner manifold being connected into the inlet gas
manifold, each gas and air feed line including a manual gas control
valve.
4. A gas cooktop as recited in claim 3 with a utensil-supporting
grid centered over each burner opening, the grid including an
annular flame spreader positioned over but above the burner opening
to enlarge the flame pattern beneath a utensil while rendering the
flame pattern more uniformly distributed, said grid also including
an outer flame diverter to direct the outer periphery of the flame
upwardly so as to keep the cooktop from being overheated in the
area surrounding each burner.
Description
BACKGROUND OF THE INVENTION
The average homemaker is interested in kitchen appliances which are
reasonable in cost, efficient and reliable in operation and easy to
keep clean. During everyday cooking operations, there is always a
certain amount of spillage, spattering and boilovers, and
accumulations of such food soil are found beneath the cooktop of a
range or built-in appliance. Accordingly, it is of advantage to the
user to be able to lift the cooktop and clean therebeneath. The
appliance serviceman also appreciates the convenience of a movable
cooktop.
The principle object of the present invention is to provide a gas
cooktop with an integral surface burner of improved design and a
gas feed line carried thereby such that the cooktop may be raised
as a unit for cleaning and servicing therebeneath.
A further object of the present invention is to provide a gas
cooktop with a plurality of surface burners and a partitioned cover
plate therebeneath to provide a separate and generally uniform
secondary air supply system for each burner where each air supply
is independent of the air supplies for the other burners.
A still further object of the present invention is to provide a gas
cooktop with integral surface burner means and a utensil-supporting
grid with a flame spreader for enlarging the overall size of the
flame pattern while rendering the flame pattern more uniformly
distributed beneath a utensil, as well as an outer flame diverter
to keep the cooktop from being overheated in the area surrounding
each burner.
SUMMARY OF THE INVENTION
The present invention, in accordance with one form thereof, relates
to a gas cooktop having at least one integral surface burner. The
cooktop has a burner opening formed therein for admitting secondary
air. A pan having an opening coinciding with the burner opening is
attached to the underside of the cooktop about both its inner and
outer peripheral edges to form a burner manifold. A plurality of
radial gas ports are formed in the manifold opening into the burner
opening to create a concentrated flame pattern within the opening.
An air distribution system underlies the cooktop and furnishes
secondary air to each burner independent of the air supply of any
other burner. A utensil-supporting grid overlies each burner and it
includes a central flame spreader and an outer flame diverter.
BRIEF DESCRIPTION OF THE DRAWINGS
Our invention will be better understood from the following
description taken in conjunction with the accompanying drawings and
its scope will be pointed out in the appended claims.
FIG. 1 is a perspective view of a gas range embodying the cooktop
design of the present invention, where the cooktop is shown in a
temporary raised position to expose the integral surface burners
formed therebeneath, as well as showing a partitioned cover plate
to form an individual air distribution system for each burner as
well as means for containing food spillage and preventing the
spillage from running down into the oven insulation.
FIG. 2 is a cross-sectional elevational view through one of the
integral surface burners of FIG. 1, but on an enlarged scale, to
show the particular nature of the burner design, as well as the
incorporation of a utensil-supporting grid centered over the burner
and made in conjunction with a flame spreader to enlarge the area
of the flame pattern beneath a utensil, as well as a flame diverter
to keep the cooktop from being overheated.
FIG. 3 is a top plan view of the integral surface burner of FIG. 2
showing the utensil-supporting grid centered over the burner and
having a flame spreader formed in the center of the grid as well as
an outer flame diverter to overlie the burner opening.
FIG. 4 is a fragmentary view on an enlarged scale of one corner of
the partitioned cover plate beneath the hinged cooktop to show the
square shallow pan configuration with air inlet openings formed in
the four sides to deliver secondary air from all sides of the
burner.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Turning now to a consideration of the drawings, and in particular
to FIG. 1, there is shown for illustrative purposes a free-standing
gas range 10 formed with an outer body or cabinet structure 11 that
incorporates a generally rectangular gas cooktop 13 (shown in FIG.
1 in a temporary raised position) that is formed over a lower oven
14 having a front-opening access door 15. A range backsplash 17 is
formed along the back edge of the cooktop 13 and it rises above the
cooktop to contain and display the various control components for
both the burners of the cooktop 13 and the oven 14 therebeneath. A
utensil drawer 20 is shown beneath the oven. An alternative to this
utensil drawer 20 would be to provide a separate gas broiler oven
in this space as is quite common in the gas range art.
The oven 14 is isolated from the cooktop 13 by a partitioned cover
plate 22 of shallow drawn configuration so that any spillage of
liquids or food onto the cooktop 13 will not drain down and
contaminate the thermal insulation of the oven 14. This cover plate
22 has four generally square depressions 6, 7, 8 and 9, one
depression beneath each burner of the cooktop 13. Hinge means 24
are formed adjacent the rear edge of the cooktop for hinging the
cooktop to the back portion of the range body 11 such that the
cooktop may be raised at the front for servicing and cleaning
therebeneath.
Looking at the underside of the cooktop 13 it is clear that there
are four integral surface burners 25-28 carried therebeneath. For a
better understanding of the construction of the surface burners,
attention is directed to the cross-sectional elevational view of
FIG. 2 which is of the burner 25. The cooktop 13 is provided with a
circular burner opening 30. The immediate area of the cooktop
encircling the burner opening 30 is depressed or drawn downward so
that the burner opening is actually disposed beneath the plane of
the cooktop 13. There is a first beveled collar 32 surrounding the
burner opening 30, and a slight circular depression 34 surrounds
the beveled collar 32. Notice that there is a slight rise in
elevation of the cooktop in the area separating the depression 34
from the beveled collar 32, such as the ring at 35. This is done so
that the depression 34 serves to collect most of the minor spillage
or boilovers that might occur. The elevation of the ring 35 is
slightly beneath the plane of the cooktop 13 such that when the
depression 34 becomes filled with liquids or spillage, the overflow
will be directed toward the central burner opening 30 rather than
spreading out over the surface of the cooktop 13.
An annular pan 37 is adapted to be attached by welding or
mechanical fastening means to the underside of the cooktop 13 for
forming a burner manifold 39. This annular pan 37 has a circular
opening 41 that substantially coincides with the burner opening 30
in the cooktop 13. This pan opening 41 is surrounded by a beveled
surface 42 that is formed at substantially the same angle as the
beveled collar 32 of the cooktop 13. This beveled surface 32 of the
pan 37 is formed with a plurality of spaced, radial corrugations 44
which surround the burner opening 30. These depressions are adapted
to be closed on the top side by the beveled collar 32 of the
cooktop thereby forming a series of radial gas ports 44 which are
open at the peripheral edge of the burner opening 30 and
communicate back into the interior of the burner manifold 39.
The pan 37 has a rather large annular depression 46 generally
underlying the relatively shallow depression 34 in the cooktop. The
outer peripheral edge of the pan 37 formed with an outwardly
directed horizontal flange 48 so that the pan may be seam welded or
mechanically fastened or sealed to the underside of the cooktop 13.
The inner peripheral edge of the pan is also sealed to the edge of
the burner opening 30, of course leaving open the gas ports 44.
These gas ports serve to establish a starlike flame pattern within
the burner opening 30 which tends to flame upwardly in the
center.
A ringlike flame spreader 52 is centered over the burner opening
30, but it is vertically spaced above the opening for enlarging the
flame pattern beneath a utensil. This flame spreader 52 is shown
supported as a ring member or a hollow inverted truncated cone that
is an integral part of a utensil-supporting grid 54, which is
generally of cross-shape, as is best seen in the plan view of FIG.
3. Of course, it will be recognized that this flame spreader 52 may
be fashioned as a separate element from the grid member 54. An
outer flame diverter 55 of inclined ring shape is fashioned
adjacent the edge of the cooktop 13 surrounding the burner to keep
this area of the cooktop from being overheated by turning up the
flame pattern if the flame reaches the diverter. Also air would be
drawn in from the outside to flow under the diverter and provide
more of a cooling action.
Looking at FIG. 1, and particularly at the underside of the cooktop
13, a main gas line 58 extends from behind the oven 14 toward the
front of the cooktop, along the central portion thereof, and it is
joined to an inlet gas manifold 60 that is assembled on the
underside of the cooktop. Extending out of this inlet gas manifold
60 is a separate gas feed line for each surface burner; such as
feed line 65 for burner 25, feed line 66 for burner 26, feed line
67 for burner 27 and feed line 68 for burner 28. Notice that each
feed line is provided with a venturi tube and air mixture nozzle 70
where the feed line connects into the burner manifold 39,
preferably at a tangential angle with the manifold so as to create
a swirling action of the air and gas mixture entering the manifold
39 to provide generally uniform gas pressures at the gas ports 44
directed toward the center of the burner opening 30. Interposed in
each gas feed line 65-68 is a manual gas valve 72 for controlling
the passage of gas through the feed line. This valve is provided
with a handle (not shown) that is located on the top side of the
cooktop and is generally indexed or positioned adjacent or closer
to the individual burner which it controls. The main gas line 58 is
provided with a flexible elbow, bend or loop (not shown) at the
rear edge of the cooktop such that when the cooktop 13 is raised or
lowered on its hinges 24, it does not cause a rupture in the main
gas line. A central trough 73 is formed in the cover plate 22 to
accommodate the main gas line 58 and the manifold 60 and the gas
valves 72.
The combined venturi tube and air mixture nozzle 70 for each burner
provides primary air to the gas supply for supporting combustion.
In addition, secondary air is necessary to support combustion
within the burner opening 30. For this purpose vertical air ducts
(not shown) are formed up the two sides and rear of the oven 14 and
they are generally open adjacent the bottom portion of the range
body 11 to create a chimney effect and draw air from the floor of
the kitchen up the air ducts to be discharged beneath the cover
plate 22. An electric fan (not shown) could be furnished to provide
a forced air system. Each surface depression 6, 7, 8 and 9 is
provided with an air opening 75 in each side of the depression to
provide equal and independent distribution of air to each burner.
The air also serves to cool the cover plate 22 and prevents the
food soil from being burned in place into a varnishlike substance.
This prevents the operation or nonoperation of the other burners
from influencing the rate of flow of the secondary air for a
particular burner.
Modifications of this invention will occur to those skilled in this
art, therefore, it is to be understood that this invention is not
limited to the particular embodiments disclosed, but that it is
intended to cover all modifications which are within the true
spirit and scope of this invention as claimed.
* * * * *