U.S. patent application number 11/576767 was filed with the patent office on 2008-04-17 for gas burner.
Invention is credited to Bernard Dane, Patrick Hunault, Christophe Trochou.
Application Number | 20080090192 11/576767 |
Document ID | / |
Family ID | 34959383 |
Filed Date | 2008-04-17 |
United States Patent
Application |
20080090192 |
Kind Code |
A1 |
Dane; Bernard ; et
al. |
April 17, 2008 |
Gas Burner
Abstract
A gas burner comprising a burner pot (2) supporting a burner
body (6) comprising a series of peripherally distributed flame
orifices (8), a gas injector (13) and a gas supply tube (11)
provided with a collar (12), which are joined to the burner pot;
the burner pot is provided with a bottom (9) which has a smooth
walled central orifice (10); the extremity (17) of the supply tube
is fitted, without any significant amount of clearance via the
underneath part of the bottom (9) of the burner pot, inside the
orifice (10) with the collar (12), resting against the lower
surface of the bottom (9); the injector (13) is screwed, from above
the bottom (9), into the extremity of the supply tube (11); and the
injector (13) is configured in such a way as to push back the wall
of the extremity of the supply tube (11) into a tight resting
position against the wall of the orifice (10).
Inventors: |
Dane; Bernard; (Veigne,
FR) ; Trochou; Christophe; (Veigne, FR) ;
Hunault; Patrick; (Veigne, FR) |
Correspondence
Address: |
PATENT GROUP;C/O DLA PIPER US LLP
203 N. LASALLE ST., SUITE 1900
CHICAGO
IL
60601
US
|
Family ID: |
34959383 |
Appl. No.: |
11/576767 |
Filed: |
October 7, 2004 |
PCT Filed: |
October 7, 2004 |
PCT NO: |
PCT/FR04/02533 |
371 Date: |
April 5, 2007 |
Current U.S.
Class: |
431/354 |
Current CPC
Class: |
F23D 14/06 20130101 |
Class at
Publication: |
431/354 |
International
Class: |
F23D 14/62 20060101
F23D014/62 |
Claims
1. A gas burner comprising a burner pot supporting a burner body
having at least one set of peripherally distributed flame orifices,
a gas injector and a gas supply tube, furnished with a collar,
being connected to said burner pot, wherein the following features
are combined: the burner pot has a bottom furnished with a
smooth-walled central orifice, the end of the supply tube is
sleeve-fitted with no notable clearance, from underneath the bottom
of the burner pot, into the orifice with the collar pressing
against the bottom face of the bottom of the burner pot, the
injector is screwed, from the top of the bottom of the burner pot,
into the end of the supply tube, and the injector is arranged to
push away the end wall of the supply tube pressing in a sealed
manner against the wall of the orifice.
2. The gas burner as claimed in claim 1, wherein said collar is
integral with the supply tube and formed by a folding of the wall
of said tube.
3. The gas burner as claimed in claim 1, wherein said injector is
externally frustoconical at least in part.
4. The gas burner as claimed in claim 3, wherein the frustoconical
portion of the injector is situated above its threaded portion.
5. The gas burner as claimed in claim 1, wherein a terminal portion
of the end of the supply tube that extends beyond the collar has a
length substantially equal to the thickness of the bottom of the
burner pot.
6. The gas burner as claimed in claim 1, wherein said supply tube
is bent beneath the collar.
7. The gas burner as claimed in claim 6, wherein said supply tube
is bent substantially at 90.degree..
8. The gas burner as claimed in claim 1, wherein the end of the
supply tube is tapped internally while the injector is furnished
with a standard thread.
9. The gas burner as claimed in claim 1, wherein the inner face of
the wall of the end of the supply tube is smooth while the injector
is furnished with a self-tapping thread.
Description
[0001] The present invention generally relates to the field of gas
burners for a domestic cooking device, and it relates more
specifically to improvments made to gas burners comprising a burner
pot supporting a burner body having at least one set of
peripherally distributed flame orifices, a gas injector and a gas
supply tube, furnished with a collar, being connected to said
burner pot.
[0002] The gas burners of the related type are routinely fitted to
domestic cooking devices (stoves, hotplates). However, the burners
currently manufactured have various drawbacks or disadvantages that
are both structural and cost-related.
[0003] Normally, the injector and the supply tube are each fixedly
attached to the burner pot by screwing.
[0004] Accordingly, the bottom of the pot is provided with a tapped
central orifice capable of receiving the gas injector which,
itself, is threaded externally at least over a portion of its
height. However, the machining of a tapped orifice in the material
forming the burner pot, usually cast aluminum, causes a removal of
the superficial annealing at least in certain locations (slivers)
on the edge of the orifice, these slivers revealing the underlying
porous material. The result of this is a considerable proportion
(20 to 30%) of burner pots that have to be scrapped.
[0005] For the attachment of the supply tube, a similar difficulty
may arise if the burner pot is provided with another orifice
suitable for receiving a connection end-piece mounted by
screwing.
[0006] In addition, irrespective of how the end of the tube is
mounted on the burner pot, the latter must be equipped
appropriately. In particular, in the case of burners under which
the available height in the cooking device is very slight, it is
known practice to design the burner pot with an integral end-piece,
incorporating the connection orifice, which extends substantially
perpendicular to the axis of the burner. However, such an integral
end-piece represents a substantial protrusion and requires material
which increases the manufacturing cost of the burner pot. In
addition, the presence of this end-piece complicates the production
of the burner pot manufacturing mold and increases the cost of
manufacturing this mold.
[0007] As for what is now the assembly of the various component
parts of the burner, these assemblies carried out by screwing
demand time and personnel and finally are costly.
[0008] The manufacturers of cooking devices are constantly and
urgently seeking ever lower production costs, which results in the
component elements, and particularly the burners, being, for their
part, manufactured in the most economical conditions possible.
[0009] The main object of the invention is to satisfy, at least in
part, the requirements of the art and to propose an enhanced
structure of a gas burner of the aforementioned type that leads to
simplified manufacture and easy assemblies, and that consequently
provides significant cost savings with respect to the manufacture
and installation of these burners.
[0010] To these ends, the invention proposes a gas burner as
mentioned in the preamble that is characterized, being arranged
according to the invention, by the combination of the following
features: [0011] the burner pot has a bottom furnished with a
smooth-walled central orifice, [0012] the end of the supply tube is
sleeve-fitted with no notable clearance, from underneath the bottom
of the burner pot, into the orifice with the collar pressing
against the bottom face of the bottom of the burner pot, [0013] the
injector is screwed, from the top of the bottom of the burner pot,
into the end of the supply tube, and [0014] the injector is
arranged to push away the end wall of the supply tube pressing in a
sealed manner against the wall of the orifice.
[0015] A gas burner arranged according to the dispositions of the
invention joins many advantages.
[0016] The fact that the orifice provided in the bottom of the
burner pot is provided with a smooth-faced wall considerably
simplifies manufacture. Specifically, the orifice may be obtained
by a simple stamping of the burner pot bottom, by applying a known
technique that is effective with the material forming the burner
pot. It is therefore possible to form an orifice with a clean wall
and an undamaged edge, without slivers, and having the required
diameter with sufficient precision.
[0017] In addition, because of the quality obtained during the
formation of the single orifice, there are virtually no defective
parts: the rate of production of correct parts is considerably
increased and the economic gain is very great.
[0018] The mounting of the injector in the end of the supply tube
means that these two components are simultaneously fixedly attached
to the burner pot through the same orifice. It is therefor
appropriate to provide only one orifice, which dispenses with the
operation for forming the second orifice required in the
conventional structure of the burner.
[0019] What is more, the assembly process is remarkably simplified:
sleeve-fitting the end of the supply tube into the orifice,
followed by screwing the injector into the end of said tube is
sufficient not only to attach these two components to the burner
pot, but also to seal this assembly automatically during screwing.
These two operations of sleeve-fitting and screwing require no
particular technical skill and may be carried out by personnel of
low qualification.
[0020] In a preferred embodiment, the collar is integral with the
supply tube and formed by a folding of the wall of said tube. The
manufacture of a tube having an end thus formed is more economical
than the conventionally adopted solutions, with provision and fixed
attachment of an external collar. In addition, to form a burner of
low height, use is made of a supply tube that is bent, particularly
substantially at 90.degree., and the supply tube bending operation
may be carried out jointly with the operation to form the
collar.
[0021] Still in the context of a preferred embodiment, provision
can be made for the injector to be externally frustoconical at
least in part. Advantageously then, it is the portion of the
injector that is situated above its threaded portion, between the
latter and the head of the injector, that is frustoconical.
[0022] In practice, it is possible to arrange matters so that the
terminal portion of the end of the supply tube that extends beyond
the collar has a length substantially equal to the thickness of the
bottom of the burner pot.
[0023] Finally, with regard to the end of the supply tube, it may
be tapped internally while the injector is furnished with a
standard thread, or else, more economically and therefore
preferred, the inner face of the wall of the end of the tube
remains smooth while the injector is furnished with a self tapping
thread.
[0024] The invention will be better understood on reading the
following detailed description of a preferred embodiment given only
as a purely illustrative example. In this description, reference is
made to the appended drawing in which the single figure is a side
view in diametric section of a gas burner arranged according to the
invention.
[0025] The gas burner illustrated in the figure, indicated in its
entirety by reference number 1, conventionally comprises a burner
pot 2 arranged to be attached to a support belonging to a cooking
device, usually a top plate of this device (in the example
illustrated, the burner pot 2 is attached to a plate-shaped portion
3 of said top plate 4, overhanging the rest of the plate). On this
burner pot there rests, by feet 5 (only one foot is visible in the
figure), a burner body 6 furnished, on its top edge, with
peripherally distributed notches. On the burner body there rests a
cap 7 that closes off the aforementioned notches from the top to
form flame orifices 8.
[0026] In the example illustrated, the burner pot 2 is arranged
with a bottom 9 of substantially generally flat shape, but this
configuration is not linked to the dispositions characteristic of
the invention that will be explained hereinafter.
[0027] The bottom 9 of the burner pot 2 is furnished with a
smooth-walled central hole or orifice 10 that may be formed by
stamping of the bottom.
[0028] A gas supply tube 11 has its end sleeve-fitted without
notable clearance, that is to say with a clearance that is strictly
necessary for the insertion, from underneath the bottom 9 of the
burner pot 2, into the orifice 10. The tube 11 is furnished with a
collar 12 that limits the insertion of the end of the supply tube
11 into the orifice 10, said collar 12 pressing against the bottom
face of the bottom 9.
[0029] An injector 13, partly threaded externally at 15, is
screwed, from the top of the bottom 9 of the burner pot 2, into the
end of the supply tube 11.
[0030] There are many ways of fitting the end of the supply tube 11
with a collar. However, the simplest and most economical solution
in practice consists in the collar 12 being produced integrally
with the supply tube 11 and formed of a folding of the wall of said
tube 11 according to a known technique.
[0031] The injector 13, for its part, is arranged to push away the
wall of the end of the supply tube 11 against the smooth wall of
the orifice 10 in order to establish with the latter a gas-tight
contact. For this purpose, various dispositions known to those
skilled in the art can be applied. Preferably however, a simple
technical solution consists in the injector being externally
frustoconical at least in part; particularly, as illustrated in the
figure, the frustoconical portion 14 of the injector 13 is situated
above its threaded portion 15, between the latter and the head 16
of the injector. When the injector is screwed into the end of the
supply tube 11, the frustoconical portion 14 comes into contact
with the edge of the tube 11 and spreads the latter radially while
forcing it against the smooth wall of the orifice 10 of the bottom
9 of the burner pot. In this way a sealed mounting is achieved
without additional parts and with no other manipulation than the
screwing of the injector.
[0032] It must be emphasized that the end of the supply tube 11 may
be threaded internally to receive the injector, or else preferably,
because of the simplicity and of the minimal cost of this technical
solution, the injector may be furnished with a self-tapping thread
capable of being screwed into the end of the internally smooth
supply tube.
[0033] This disposition of the invention will be easier to apply
if, as illustrated in the figure, the terminal portion 17 of the
end of the supply tube that extends beyond the collar 12 has a
length substantially equal to the thickness of the central portion
of the bottom 9 of the burner pot. It will be noted that this
central portion of the bottom 9 of the burner pot may be made
thicker than the rest of the bottom, for example by providing an
extra thickness in the form of a plate 18 as shown in the figure,
in order to reinforce the bottom 9 and/or to procure a bearing
height of the tube on the wall of the orifice 10 that is sufficient
to achieve the necessary seal in a secure manner and/or to wedge
the injector in a correct vertical position relative to the burner
body 6.
[0034] To form a low height burner as may be required for certain
cooking device such as hotplates, the tube 11 may be bent,
particularly substantially by 90.degree., under the collar. In an
economic manner, the formation of the integral collar 12 and the
bending of the tube may be carried out during a single
operation.
[0035] Thanks to the dispositions according to the invention, a gas
burner of the usual type is made with a minimum number of
components (only three components for the bottom portion of the
burner) and these components are assembled with fewer, simple
manipulations. Such a gas burner is therefore able to be
manufactured in particularly favorable economic conditions.
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