Year: 1888

page_text: WO, JOHN FREDERIC WRIGHT and GEORGE ERNEST WRIGHT, of the firm of
John Wright & Co., of Essex Works, Thimble Mill Lane, Aston, Warwick-
shire, Gas Engineers, do hereby declare the nature of this invention to be as
follows:
-
This invention has reference more particularly to those atmospheric gas burners
for heating or cooking purposes which are required to give a large body of flame,
tho objects being to so construct the said burners that they will give a level flame
and one which will not "flash back" when turned down low.
The said burners as usually constructed each consist of a mixing chamber (which
takes various forms according to circumstances and is commonly tubular) into which
the mixed gas and air enters horizontally by an injector tube and at the upper side
of which are the openings or burners proper through which the mixture escapes
and where it is burnt. As the gaseous mixture does not impinge directly on the
openings or burners proper and its velocity is greatest where it enters the mixing
chamber it follows that less gas escapes through the nearest openings or burners
proper than through those which are farther away, hence the flame is higher at
one part than at others. Moreover by the injector tube communicating directly
with the mixing chamber and consequently being, comparatively speaking, near to
the inlet openings or burners proper, it follows that when the flame is turned down
so low as to reduce the velocity of the gaseous mixture below a certain point, the
gaseous mixture in the mixing chamber explodes or "flashes back."
According to our invention instead of the injector tube communicating directly
with the so called "mixing chamber," that is the chamber which is immediately
below the outlet openings or burners proper, we provide an additional chamber or
chambers between the "mixing chamber and the injector tube which chamber or
chambers may have numerous inlets or outlets or inlets and outlets or perforated
gratings so as to split up the gaseous mixture and obtain an uniform pressure at
all parts of the "mixing chamber so as to ensure a level flame and by the
mixture having to travel through more numerous and tortuous passages prevent the
flame "flashing back."
39

page_text: or
Our invention may be carried out in various ways one of which as applied to a
burner for a gas fire is as follows:-In this class of burner the "mixing chamber"
is usually a straight tube, the gaseous mixture entering at the ends by one
more injector tubes which bend round from the gas inlet at one side and the
gascous mixture passes out through the row of burners proper at the top side of
the "mixing chamber." We close the ends of the "mixing chamber" and provide
an additional chamber at the side thereof which communicates with the " mixing
chamber by means of side openings. The gaseous mixture thus has to pass from
the gas inlet round to the additional chamber and from that through the openings
to the "mixing chamber". and the desired results as above stated are obtained.
ני
In another example of our invention, as applied more particularly to burners for
boiling or cooking, where a solid flat flame is required we provide an additional
chamber below the "mixing chamber" and which communicates with the " mixing
chamber" by a perforated grating, and the gaseous mixture enters the additional
chamber by several inlets from a tubular passage communicating with the injector
tube and surrounding the said additional chamber.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Burners for Heating and Cooking Purposes.
We, JOHN FREDERIC WRIGHT and GEORGE ERNEST WRIGHT, of the firm of
John Wright & Co. of Essex Works, Thimble Mill Lane, Aston, Warwickshire,
Gas Engineers, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention has reference more particularly to those atmospheric gas burners
for heating or cooking purposes which are required to give a large body of flame,
the objects being to so construct the said burners that they will give a level flame
and one which will not "flash back" when turned down low.
The said burners as usually constructed each consist of a mixing chamber (which
takes various forms according to circumstances and is commonly tubular) into which
the mixed gas and air enters horizontally by an injector tube and at the upper sido
of which are the openings or burners proper through which the mixture escapes and
where it is burnt. As the gaseous mixture does not impinge directly on the
openings or burners proper and its velocity is greatest where it enters the mixing
chamber it follows that less gas escapes. through the nearest openings or burners
proper than through those which are farther away, hence the flame is higher at one
part than at others. Moreover by the injector tube communicating directly with the
mixing chamber and consequently being,. comparatively speaking, near to the inlet
openings or burners proper, it follows that when the flame is turned down as low
as to reduce the velocity of the gaseous mixture below a certain point the gaseous
mixture in the mixing chamber explodes or "flashes back."
According to our invention instead of the injector tube communicating directly
with the so called "mixing chamber" that is the chamber which is immediately
below the outlet openings or burners proper, we provide an additional chamber or
chambers between the "mixing chamber" and the injector tube which chamber or
chambers may have numerous inlets or outlets or inlets and outlets or perforated gratings
so as to split up the gaseous mixture and obtain an uniform pressure: at, all parts of
the "mixing chamber" so as to ensure a level flame and by the mixture having to
travel through more numerous and tortuous passages prevent the flame "flashing
back."
Our invention may be carried out in various ways one of which as applied to a
burner for a gas fire is as follows: In this class of burner the "mixing chamber"

page_text: is usually a straight tube, the gaseous mixture entering at the ends by one or more
injector tubes which bend round from the gas inlet at one side and the gaseous
mixture passes out through the row of burners proper at the top side of the
"mixing chamber." We close the ends of the "mixing chamber" and provide an
additional chamber at the side thereof which communicates with the ** mixing
chamber" by means of side openings. The gaseous mixture thus has to pass from
the gas inlet round to the additional chamber and from that through the openings to
the mixing chamber" and the desired results as above stated are obtained.
In another example of our invention, as applied more particularly to burners for
boiling or cooking, where a solid flat flame is required we provide an additional
chamber below the "mixing chamber" and which communicates with the "mixing
chamber" by a perforated grating and the gaseous mixture enters the additional
chamber by several inlets from a tubular passage communicating with the injector
tube and surrounding the said additional chamber.
On the accompanying drawings Fig. 1 represents in plan partly in section a burner
for a gas fire constructed according to our invention; Fig. 2 is an elevation of the
same partly in section; Fig. 3 is a cross section of the same on line X X of Fig. 1;
and Fig. 4 is a cross section of the same on line Y Y of Fig. 1; Fig. 5 represents
in plan and Fig. 6 in sectional elevation a gas burner more particularly for boiling
or cooking purposes constructed according to our invention and Figs. 7, 8 and 9
illustrate parts of the same separately.
The same letters of reference indicate corresponding parts in all the figures.
Referring firstly more particularly to Figs. 1, 2, 3 and 4, a is the injector tube,
bis the gas inlet pipe and c, c, are the openings through which the air enters to
mix with the gas. d is the so called "mixing chamber" immediately below the
burners proper e, and f is the additional chamber which we provide between the
injector tube b and the mixing chamber
d; the injector tube communicates
with the ends of the additional chamber and this chamber communicates with the
mixing chamber d by the openings g as shown by the arrows. The gaseous mixture
thus has to pass from the gas inlet & round to the additional chamber and from
that through the openings to the "mixing chamber" d thus by splitting up the
gaseous mixture and obtaining an uniform pressure at all parts of the "mixing
chamber" we ensure a level flame and by the mixture having to travel through the
passages and g the flame is prevented from flashing back.
9.
In the example of our invention illustrated by Figs. 5, 6, 7, 8 and 9 an additional
chamber is provided below the "mixing chamber d, the communication between
the chambers and d being through the perforated grating h. The gaseous mixture
flows from the injector tube a through the passage f¹ and enters the additional
chamber by the openings and then passes up through the grating to the
burners proper e; the passages and grating splitting up and thoroughly mixing the
gaseous mixture and giving the desired results as stated above.
The accompanying drawings shew what is considered to be the best way for
carrying the said invention into effect but it is to be understood that the invention
is not limited to the precise details shown.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
1st. In atmospheric gas burners for heating cooking or boiling purposes, the
employment of an additional chamber or chambers between the "mixing chamber"
and the injector tube the said chambers being connected together by passages
through gratings or otherwise so as to split up the gaseous mixture, for the purposes
and substantially as herein before set forth.
2nd. In an atmospheric gas burner and in combination with the injector tube a
« mixing chamber
d and burners proper e, the additional chamber f communicating
with the injector tube a and mixing chamber d, for the purposes and substantially

page_text: as hereinbefore described and illustrated by Figs. 1, 2, 3 and 4 of the accompanying
drawings.
"
3rd. In an atmospheric gas burner and in combination with the injector tube a
mixing chamber" and burners proper e, the additional chamber and passages f
communicating together and with the injector tube a and mixing chamber
d
and with or without the perforated grating or gratings h, for the purposes and
substantially as hereinbefore described and illustrated by Figs. 5, 6, 7, 8 and 9 of the
accompanying drawings.