Year: 1888

page_text: Date of Application, 30th July, 1888
Specification Accepted, 7th Sept., 1888
I, BENJAMIN JOSEPH BARNARD MILLS of 23 Southampton Buildings in the
County of Middlesex, Patent Agent, do hereby declare the nature of this invention,
a communication to me from abroad by Charles Stanford Upton of the City, County
and State of New York, in the United States of America, Manufacturer and Inventor,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The invention has for its object a gas burner in which a full supply of air is con-
veyed evenly both inside and outside of a circular gas flame.
To this end the improved gas burner is constructed with an annular gas chamber.
which is connected with the gas pipe and through which gas passes to the jets.
Outside of this annular chamber, and between it and the chimney, air is supplied to
the outside of the flame, its flow being moderated and directed by suitable screens
hereinafter described. The air passing up within the annular chamber is gathered into
a perforated thimble which fits the inner cylindrical wall of such chamber closely.
The construction of this air feeding thimble is peculiar, as will be hereinafter pointed
A screen is also provided covering all of the space under the burner so as to
moderate the flow of all the air passing to the burner.
out.
In the accompanying drawings:
Figure 1 is a perspective view of the improved gas burner.
Figure 2 is a vertical sectional view of the same.
Figure 3 is an underside view, the lowermost air screen being removed and part of
the gas supply pipe being broken away.
Figure 4 is a vertical section of the improved gas burner slightly modified.
Figure 5 is a sectional view on the line 5-5, figure 4.
Figure 6 is a sectional view of another gas burner slightly modified.
Figures 7 and 8 are sectional detail views of modifications.
In these drawings 1 may represent nozzle, which may be screwed on to any
ordinary gas burner, the ordinary top having been first removed. The nozzle 1 has
three or any number of hollow arms 3 which support the upper part of the gas burner
and supply gas to the annular chamber 4 thereof. The chamber 4 has jet apertures 5
at top and is formed between the cylindrical walls 6. 7.
8 is an air chamber formed between the cylindrical wall 6 and the perforated

page_text: shells 9. 10. The chimney of the burner resting upon the ledge 11 and pressing
against the ring 9 does not allow the air to be supplied to the flame from the side
and it is compelled to pass through the perforations of the shells 10 and 9. Perfora-
tions in the former are made larger than in the latter so as to supply air evenly while
interrupting its flow sufficiently to prevent the jets of air from striking the flame with
such force as to cause it to flicker. This construction prevents the formation of
eddying currents within the burner.
The thimble 12, which is preferably slightly converging, as shown in Figures 1
and 2, fits the inner wall 7 of the chamber 4 so as to take up all of the air passing
between the arms 3. The thimble may be further steadied by being fixed to a ring 13
adapted to slide within the cylindrical wall 7. A second thimble 14 within the
first is made with large perforations so as to break the force of the air currents before
they strike the outer thimble 12. The latter is provided with smaller perforations,
which supply the air evenly to all parts of the flamme and insure a complete and steady
combustion.
To further steady the flow of air both from the inside and the outside of the annular
chamber 4 I provide shell 15 spreading from the nozzle 1 to the chimney ledge and
provided with large and numerous perforations.
In figure 4 I have shown a modified form of the outer thimble 12 as well as the
inner thimble 14. In this instance the outer thimble stands slightly away from the
inner wall and is supported on the standard 16, which is also connected with the inner
thimble 14. The inner thimble may be formed in the shape of scollops, on its lower
odge as shown in figure 4 and in plan view in figure 5. Those form legs, which bear
against the inner wall 7 of the gas chamber 4 and serve to steady the parts and keep
them in their proper alignment.
In figure 6 this is further modified by dispensing with the standard 16 and supporting.
the thimble upon the bead 17 of the inner wall 7.
In figure 7 I have shown perforated thimbles, the outer one having a bead 17 for
supporting both upon the upper edge of the inner wall 7. In figure 8 the gas
chamber 4 is made in two parts and I provide a screen at 18. The object of this
screen is to regulate the currents of gas as they flow through the tubes in the arms 3
so as to cause an even distribution of the gas after it leaves the said screen and before
it reaches the final points of exit 5. By this means any uneveness of the gas flame is
prevented.
The upper part of the annular gas chamber can be removed by unscrewing at
the joint 19, which will afford means for the cleaning of the inner screen 18 when
desired.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
· claim is :-
1. In a gas burner, the combination of an annular gas chamber or tube, a central
air-tube provided with means for screening and sifting the air and directing it hori-
zontally against the flame, and an outside draft tube or chamber also provided with
screens, as and for the purpose set forth.
2. In a gas burner, the combination of an annular gas chamber, a surrounding air
chamber provided with an outer and an inner screen and an inclosed or central air
chamber, also provided with an outlet and an inner screen, substantially as shown and
described.
3. In a gas burner, the combination of an annular gas chamber, a central air tube
terminating in a thimble having perforated sides, the said sides being set inwardly
from the line of the flame, and an annular air chamber surrounding the gas
chamber.
.
. 4. The combination with an annular gas chamber 4, annular perforated shells 9. 10,
surrounding the same and adapted to supply air to the outside of the flame and
perforated thimbles 12, 14, within such annular chamber 4 and adapted to supply air
to the inside. of. the flame, substantially as set forth,

page_text: 5. In combination with the walls 6. 7, forming the annular gas chamber 4, the
double perforated thimble 12. 14 fitting the inner cylindrical wall 7 and the perforated
shells 9. 10, surrounding the outer wall 6, the whole arranged and adapted to supply
air evenly to all parts of the flame substantially as set forth.
6. In combination with the cylindrical walls 6. 7 forming the annular gas chamber 4,
the perforated thimble 12 fitting the inner wall 7, and the ring 13 to which said
thimble 12 is fixed and by which it is steadied, substantially as set forth.
7. In combination with a gas burner having the chamber 4, the perforated
shells 9, 10, a double perforated thimble 12, 14, the screen 15 spanning the space
under the chimney, substantially as set forth.
8. In a gas burner the combination of the separable annular gas tube or chamber
with the screen 18 and jet apertures 5 with the inner and outer air tubes or chambers
provided with means for sifting and directing the air currents.
9. The combination of the central air tube in a gas burner, a double perforated
thimble and a bead or stop for supporting said thimble from said tube, substantially
as set forth.