DISPOSITIF D'ADMISSION D'AIR SECONDAIRE VARIABLE

VARIABLE SECONDARY AIR INTAKE DEVICE

Abrégé français

Un dispositif dadmission dair secondaire variable comporte un élément déflecteur conçu pour être fixé à lintérieur dune zone supérieure dune chambre à feu du foyer. Lélément déflecteur comprend une partie supérieure ayant un trou délément de canal à travers celui-ci, des parois latérales, une partie inférieure ayant une pluralité de petits trous à travers celui-ci, et une ouverture de sortie de gaz ayant des parois latérales et sétendant à travers la partie supérieure et la partie inférieure. Un élément de chambre creux conçu pour être placé sur une surface supérieure de lélément déflecteur comprend une partie supérieure ayant un trou délément de canal à travers celle-ci, et des parois latérales sétendant vers le bas à partir de la partie supérieure et formant une chambre ayant une périphérie qui comprend une pluralité de trous de sortie de gaz à travers celle-ci.

Abrégé anglais

An variable secondary air intake device has a baffle member adapted to be attached within an upper area of a fire chamber of the firebox. The baffle member includes a top having a channel member hole therethrough, side walls, a bottom having a plurality of small holes therethrough, and a gas exit opening having side walls and extending through the top and bottom. A hollow chamber member adapted to be placed upon a top surface of the baffle member, the hollow chamber member includes a top having a channel member hole therethrough, and side walls extending downward from the top and forming a chamber having a periphery that includes a plurality of gas exit holes therethrough.

Revendications

10
CLAIMS
1.) A variable secondary air intake device for use with a firebox, said
variable
secondary air intake device comprising of a baffle member adapted to be
attached
within an upper area of a fire chamber of said firebox, said baffle member
including a
top having a channel member hole therethrough, side walls, a bottom having a
plurality of small holes therethrough, and a gas exit opening having side
walls and
extending through said top and bottom; a hollow chamber member adapted to be
placed upon a top surface of said baffle member, said hollow chamber member
including a top having a channel member hole therethrough, and side walls
extending downward from said top and forming a chamber having a periphery that

includes a plurality of gas exit holes therethrough; an elongated hollow
channel
member adapted to be placed within and through said holes of said baffle
member
top, said hollow chamber member top, and a hole within a top member of said
firebox, to thereby allow secondary air to pass therethrough and into said
baffle
member, and an adjustable gate adapted to be attached upon a top end portion
of
said channel member, said adjustable gate including a base portion having an
opening therethrough adapted to allow said secondary air to pass therethrough
and
into said channel member, a movable cover member pivotally attached to said
base
portion and adapted to adjustably cover said opening, and a bimetal element
attached to said base portion and adapted to push against and move said cover
member in either of two pivoting directions depending on the temperature of
said
bimetal element, wherein said adjustable secondary air intake device is
adapted such
that when a fire rises above a predetermined temperature within said firebox
chamber, said bimetal element begins to bend and push and pivot said cover
member and thereby gradually open said opening and allow an increasing amount
of
secondary air to pass therethrough and into said baffle member to thereby pass

through said plurality of small holes in said bottom thereof and into said
fire chamber
of said firebox as a secondary air supply to thereby increase the burning rate
of the
material being burned therein, and wherein flammable gases from said material
being burned are adapted to rise and pass through said gas exit opening of
said
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baffle member and into the hollow chamber of said hollow chamber member where
they are slowed down and spread to thereby allow for their complete combustion

before escaping through its gas exit holes and then out through an exhaust
hole
within a top member of said firebox and discharged through an exhaust pipe
therefrom.
2.) The variable device of claim 1, wherein said bimetal element comprises two

differing elongated flat metallic members connected to one another along
adjacent
surfaces.
3.) The variable device of claim 2, wherein said cover member of said
adjustable
gate is formed as an elongated rectangular channel having two sides extending
perpendicular to a base portion, wherein said bimetal element resides within
said
channel, is parallel to said two sides, and is adapted to push against either
side of
said channel depending on the temperature of said fire chamber, such that when
the
temperature of said fire chamber is increasing, said cover member is gradually

pushed and pivoted to an open position to allow more secondary air
therethrough,
and when the temperature of said fire chamber is decreasing, said cover member
is
gradually pushed and pivoted to a closed position to decrease and eventually
cut off
the amount of secondary air passing therethrough.
4.) The variable device of claim 1, wherein said hollow chamber forms an
interior
shape having a rectangular volume.
5.)
The variable device of claim 1, wherein said baffle member is formed in the
shape of a rectangular volume, said gas exit opening is formed in the shape of
a
rectangular volume, and said small holes being arranged into a series of
concentric
circles.
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6.) The variable device of claim 1, wherein said channel member hole of said
baffle
member, said channel member hole of said hollow chamber member, and said
channel member are formed having a similar rectangular cross section, and are
aligned such that said channel member can pass snugly therethrough.
7.) A combination of a firebox and a variable secondary air intake device,
said firebox including a fire chamber forming an interior rectangular volume;
and a
top member including a channel member hole therethrough, and an exhaust vent
hole therethrough; and
said adjustable secondary air intake device comprising of a baffle member
adapted
to be attached within an upper area of said fire chamber of said firebox, said
baffle
member including a top having a channel member hole therethrough, side walls,
a
bottom having a plurality of small holes therethrough, and a gas exit opening
having
side walls and extending through said top and bottom; a hollow chamber member
adapted to be placed upon a top surface of said baffle member, said hollow
chamber
member including a top having a channel member hole therethrough, and side
walls
extending downward from said top and forming a chamber having a periphery that

includes a plurality of gas exit holes therethrough; an elongated hollow
channel
member adapted to be placed within and through said holes of said baffle
member
top, said hollow chamber member top, and a hole within a top member of said
firebox, to thereby allow secondary air to pass therethrough and into said
baffle
member, and an adjustable gate adapted to be attached upon a top surface of
said
top member of said firebox and to a top end portion of said channel member,
said
adjustable gate including a base portion having an opening therethrough
adapted to
allow said secondary air to pass therethrough and into said channel member, a
movable cover member pivotally attached to said base portion and adapted to
adjustably cover said opening, and a bimetal element attached to said base
portion
and adapted to push against and move said cover member in either of two
pivoting
directions depending on the temperature of said bimetal element, wherein said
adjustable secondary air intake device is adapted such that when a fire rises
above a
predetermined temperature within said firebox chamber, said bimetal element
begins
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to bend and push and pivot said cover member and thereby gradually open said
opening and allow an increasing amount of secondary air to pass therethrough
and
into said baffle member to thereby pass through said plurality of small holes
in said
bottom thereof and into said fire chamber of said firebox as a secondary air
supply to
thereby increase the burning rate of the material being burned therein, and
wherein
flammable gases from said material being burned are adapted to rise and pass
through said gas exit opening of said baffle member and into the hollow
chamber of
said hollow chamber member where they are slowed down and spread to thereby
allow for their complete combustion before escaping through its gas exit holes
and
then out through said exhaust hole of said top member of said firebox and
discharged through an exhaust pipe therefrom.
8.) The adjustable device of claim 7, wherein said bimetal element comprises
two
differing elongated flat metallic members connected to one another along
adjacent
surfaces.
9.) The adjustable device of claim 8, wherein said cover member of said
adjustable
gate is formed as an elongated rectangular channel having two sides extending
perpendicular to a base portion, wherein said bimetal element resides within
said
channel, is parallel to said two sides, and is adapted to push against either
side of
said channel depending on the temperature of said fire chamber, such that when
the
temperature of said fire chamber is increasing, said cover member is gradually

pushed and pivoted to an open position to allow more secondary air
therethrough,
and when the temperature of said fire chamber is decreasing, said cover member
is
gradually pushed and pivoted to a closed position to decrease and eventually
cut off
the amount of secondary air passing therethrough.
10.) The adjustable device of claim 7, wherein said hollow chamber forms an
interior
shape having a rectangular volume.
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11.) The adjustable device of claim 7, wherein said baffle member is formed in
the
shape of a rectangular volume, said gas exit opening is formed in the shape of
a
rectangular volume, and said small holes being arranged into a series of
concentric
circles.
12.) The adjustable device of claim 7, wherein said channel member hole of
said top
member of said firebox, said channel member hole of said baffle member, said
channel member hole of said hollow chamber member, and said channel member
are formed having a similar rectangular cross section, and are aligned such
that said
channel member can pass snugly therethrough.
Date Recue/Date Received 2020-05-13

Description

I
Variable secondary air intake device
FIELD OF THE INVENTION
[001] The present invention relates generally to solid fuel burning appliances
but more particularly to an variable secondary air intake device.
BACKGROUND OF THE INVENTION
[002] Solid fuel burning appliances have two sources of air. A primary source
and a secondary source. The primary source controls the burn rate and
is arranged in such a way that the air is in contact with the wood and
helps the wood to burn as a solid. It is adjustable by the user.
[003] The secondary source is not in direct contact with the wood. It is
directed into the firebox, usually from the top part, just below the baffle.
It helps to burn the combustible gases before escaping to the chimney.
If those gases are not burned properly, they are a source of pollution but
also are wasted as a potential source of additional heat energy.
[004] Currently, in wood burning appliances, the secondary air is constant and

cannot be adjusted. The amount of secondary air required for proper
combustion varies with the amount of gas released in relation to the
temperature of the firebox, and as such, ideally, a variable amount of
secondary source air is best.
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SUMMARY OF THE INVENTION
[005] In view of the foregoing disadvantages inherent in the known devices
now present in the prior art, the present invention, which will be
described subsequently in greater detail, is to provide objects and
advantages which are:
[006] To provide for a secondary source of air that is variable, which
increases
the efficiency of the appliance and maximizes its burn time.
[007] In order to do so, the invention comprises a baffle member adapted to
be attached within an upper area of a fire chamber of the firebox. The
baffle member includes a top having a channel member hole
therethrough, side walls, a bottom having a plurality of small holes
therethrough, and a gas exit opening having side walls and extending
through the top and bottom.
15[008] A hollow chamber member adapted to be placed upon a top surface of
the baffle member, the hollow chamber member includes a top having a
channel member hole therethrough, and side walls extending downward
from the top and forming a chamber having a periphery that includes a
plurality of gas exit holes therethrough.
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[009] An elongated hollow channel member adapted to be placed within and
through the holes of the baffle member top, the hollow chamber member
top, and a hole within a top member of the firebox, to thereby allow
secondary air to pass therethrough and into the baffle member, and an
adjustable gate adapted to be attached upon a top end portion of the
channel member, the adjustable gate including a base portion having an
opening therethrough adapted to allow the secondary air to pass
therethrough and into the channel member.
[0010] The bimetal element begins to bend and push and pivot the cover
member and thereby gradually open the opening and allow an
increasing amount of secondary air to pass therethrough and into the
baffle member to thereby pass through the plurality of small holes in the
bottom thereof and into the fire chamber of the firebox as a secondary
air supply to thereby increase the burning rate of the material being
burned therein, and wherein flammable gases from the material being
burned are adapted to rise and pass through the gas exit opening of the
baffle member and into the hollow chamber of the hollow chamber
member where they are slowed down and spread to thereby allow for
their complete combustion before escaping through its gas exit holes
and then out through an exhaust hole within a top member of the firebox
and discharged through an exhaust pipe therefrom.
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[0011] The bimetal element comprises two differing elongated flat metallic
members connected to one another along adjacent surfaces.
[0012] The cover member of the adjustable gate is formed as an elongated
rectangular channel having two sides extending perpendicular to a base
portion, wherein the bimetal element resides within the channel, is
parallel to the two sides, and is adapted to push against either side of
the channel depending on the temperature of the fire chamber, such
that when the temperature of the fire chamber is increasing, the cover
member is gradually pushed and pivoted to an open position to allow
more secondary air therethrough, and when the temperature of the fire
chamber is decreasing, the cover member is gradually pushed and
pivoted to a closed position to decrease and eventually cut off the
amount of secondary air passing therethrough.
[0013] In a preferred embodiment, the hollow chamber forms an interior shape
IS having a rectangular volume.
[0014] The baffle member is formed in the shape of a rectangular volume, the
gas exit opening is formed in the shape of a rectangular volume, and the
small holes being arranged into a series of concentric circles.
[0015] The channel member hole of the baffle member, the channel member
hole of the hollow chamber member, and the channel member are
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formed having a similar rectangular cross section, and are aligned such
that the channel member can pass snugly therethrough.
[0016] The variable secondary air intake device works in combination with a
firebox.
5[0017] There has thus been outlined, rather broadly, the more important
features of the invention in order that the detailed description thereof
that follows may be better understood, and in order that the present
contribution to the art may be better appreciated. There are additional
features of the invention that will be described hereinafter and which will
form the subject matter of the claims appended hereto.
[0018] In this respect, before explaining at least one embodiment of the
invention in detail, it is to be understood that the invention is not limited
in its application to the details of construction and to the arrangements
of the components set forth in the following description or illustrated in
the drawings. The invention is capable of other embodiments and of
being practiced and carried out in various ways. Also, it is to be
understood that the phraseology and terminology employed herein are
for the purpose of description and should not be regarded as limiting.
[0019] As such, those skilled in the art will appreciate that the conception,
upon
which this disclosure is based, may readily be utilized as a basis for the
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designing of other structures, methods and systems for carrying out the
several purposes of the present invention. It is important, therefore, that
the claims be regarded as including such equivalent constructions
insofar as they do not depart from the spirit and scope of the present
invention.
[0020] These together with other objects of the invention, along with the
various
features of novelty which characterize the invention, are pointed out with
particularity in the claims annexed to and forming a part of this
disclosure. For a better understanding of the invention, its operating
advantages and the specific objects attained by its uses, reference
should be made to the accompanying drawings and descriptive matter
which contains illustrated preferred embodiments of the invention.
15BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Fig. 1 Isometric view of the invention in context.
[0022] Fig. 2 Isometric view of the gate and opening.
[0023] Fig. 3 Exploded view of the invention.
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[0024] Fig. 4a-d Isometric, front, side cutaway, and top view, respectively,
of
the baffle.
[0025] Figs]. 5[a-b] Side and front cutaway view respectively, of the hollow
chamber.
5DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0026] A variable secondary air intake device (10) is comprised of an
adjustable
gate (12) covering an opening (20), a channel member (22), and a baffle
member (26).
[0027] The gate (12) varies the amount of secondary air entering a fire
chamber (14) by way of the channel member (22). The gate (12) is
comprised of a cover member (13), and a base portion (15). The gate
(12) is controlled by a bimetal element (16) which pushes the gate (12)
open as the increasing amount of heat bends the bimetal into pushing
the gate (12) open or closing it as the amount of heat decreases.
15[0028] The top part of a firebox (18) has the secondary air entering from
the
opening (20), through the channel member (22), and into the baffle
member (26) where the secondary air is preheated before entering the
fire chamber (14) through a plurality of small holes (28).
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[0029] When the fire is started, only primary air enters the fire chamber
(14). At
this stage there is no need for secondary air since the mass of wood is
cold and there aren't any flammable gases released. As the burning
progresses, the temperature rises and flammable gases are released,
the bimetal element (16) starts opening the adjustable gate (12)
gradually, allowing secondary air to enter the fire chamber (14), as
described hereinabove, and complete the combustion.
[0030] The products of combustion (gases) enter a hollow chamber member
(24), located just above the baffle member (26), through a gas exit
opening (30). In this hollow chamber (24), the gases are slowed down
and spread to allow for a complete combustion before the gases escape
through gas exit holes (32) located on the periphery of the hollow
chamber member (24). The exit holes (32) connect with a chimney (not
shown) as is known in the art.
15[0031] As to a further discussion of the manner of usage and operation of
the
present invention, the same should be apparent from the above
description. Accordingly, no further discussion relating to the manner of
usage and operation will be provided.
[0032] With respect to the above description then, it is to be realized that
the
optimum dimensional relationships for the parts of the invention, to
include variations in size, materials, shape, form, function and manner of
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operation, assembly and use, are deemed readily apparent and obvious
to one skilled in the art, and all equivalent relationships to those
illustrated in the drawings and described in the specification are
intended to be encompassed by the present invention.
5[0033] Therefore, the foregoing is considered as illustrative only of the
principles of the invention. Further, since numerous modifications and
changes will readily occur to those skilled in the art, it is not desired to
limit the invention to the exact construction and operation shown and
described, and accordingly, all suitable modifications and equivalents
may be resorted to, falling within the scope of the invention.
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