A Device to Prevent the Explosion or the Igniting of the Gas inside Gas Burners, such as are known by the name of "Bunsen " Burners.
Year: 1895

page_text: Date of Application, 20th Aug., 1895
Complete Specification Left, 27th Feb., 1896-Accepted, 11th Apr., 1896
PROVISIONAL SPECIFICATION.
A Device to Prevent the Explosion or the Igniting of the Gas
inside Gas Burners, such as are known by the name of "Bunsen "
Burners.
CHARLES FREDERICK NEWTON HALL Engineer, 57 Queen Street, Smethwick
in the County of Stafford, and THOMAS WILLIAM JAMES Commission Agent
78 Trafalgar Road Moseley Worcestershire do hereby declare the nature of this
invention to be as follows:-
This invention relates to gas burners known as "Bunsen".burners & is a device
to prevent the "backing" or lighting back of the gas inside the burner.
It may be used in conjunction with any Bunsen burner, but it is particularly
It is well
applicable to the Bunsen burnere used in gas stoves & such like.
known that upon lighting a Bunsen burner, should there be any residual mixture of
gas & air in the tube this mixture will explode inside the tube & at the same time
will ignite the gas at the small inner tube of the Bunsen burner with the result that
the principle of the Bunsen burner is destroyed. To prevent this lighting back of
the gas we provide in our invention a cover or lid which automatically closes the
aperture ordinarily provided in a Bunsen burner for the inlet of the air, by the
action of turning off the gas at the tap or valve & which will also open or uncover
the aforesaid aperture immediately the gas is turned on again. It will therefore be
seen that as soon as the gas is turned off, the air inlet is closed, thereby preventing
any mixture of gas & air to take place inside the tube while the burner is not in use.
Upon lighting the burner again there being no mixture of gas & air left in the tube
it is impossible for the gas to light back or to explode & ignite in the air chamber.
The movement of the cover to open or close the air inlet, simultaneously with the
movement of the tap or valve in the turning on or off of the gas is effected by means
of a lever or levers, or other suitable means.
Dated this 19th day of August 1895.
CHARLES FREDERICK NEWTON HALL.
THOMAS WILLIAM JAMES.
COMPLETE SPECIFICATION.
A Device to Prevent the Explosion or the Igniting of the Gas
inside Gas Burners, such as are known by the name of "Bunsen"
Burners.
We CHARLES FREDERICK NEWTON HALL, of No. 57 Queen Street, Smethwick
in the County of Stafford, Engineer, and THOMAS WILLIAM JAMES, of
No. 78 Trafalgar Road, Moseley, in the County of Worcester, Commission Agent,
do hereby declare the nature of our 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 relates to gas burners known as Buusen burners and consists
in adapting to such burners the device hereinafter described to prevent the backing

page_text: or lighting back of the gas inside the burner. Our invention may be used in
conjunction with any kind of Bunsen burner, but is particularly applicable to the
Bunsen burners used in gas stoves and such like. It is well known, that upon
lighting a Bunsen burner, should there be any residual mixture of gas and air in
the supply tube, the gaseous mixture will explode inside the tube and at the same
time will ignite the gas at the smaller inner tube of the Bunsen burner.
To prevent the lighting back of the gas we provide a closing cover or valve or
lid which automatically closes the aperture ordinarily provided in a Bunsen burner
for the inlet of the air by the action of turning off the gas at the tap or valve, and
which cover or valve will also open or uncover the aforesaid air aperture
immediately the gas is turned on again. It will therefore be understood that as
soon as the gas is turned off, the air inlet is closed thereby preventing any mixture
of gas and air inside the tube while the burner is not in use. Upon again lighting
the burner, there being no mixture of gas and air left in the tube, the gas does not
light back or explode and ignite in the air chamber. The movement of the closing
cover or lid to open or close the air inlet, simultaneously with the movement of the
tap or valve in the turning on or "off" of the gas is effected by means of a lever
66
"
or levers or other suitable means.
We will now proceed to describe with reference to the accompanying drawings
the manner in which our invention is to be performed.
Figures 1 and 2 represent in longitudinal section, a Bunsen burner gas stove for
heating a saucepan, kettle or other vessel, with which gas stove. our improved
device or arrangement of parts, for simultaneously shutting off the air and gas from
and admitting them to the Bunsen burner is combined for the purpose hereinbefore
described. In Figure 1 the gas and air passages of the burner are represented
closed and in Figure 2 they are represented automatically opened by the placing
on the stand of the gas stove a saucepan (or other vessel) to be treated;
Figure 3 represents a plan of underside of a portion of the burner of the stove and
Figure 4 represents the gas passages detached from the burner.
The same letters of reference indicate the same parts in the several figures of the
drawings.
a is the tubular circular burner provided with the usual gas jets 6; c is the stand
of the burner for supporting a saucepan, kettle or other vessel to be heated; d is
the chamber or supply tube by which a mixture of gas and air is supplied to the
hollow burner a; d is an opening and seat on the underside of the chamber
or supply tube d by which opening, air may be admitted to the said chamber or
tube. The said opening d is uncovered and closed by means of the closing cover
or valve e carried by the lever f,f turning on the ceutre f³. The underside of the
cover or valve e has a seating of leather or india-rubber for ensuring a close fit of
the said cover or valve on the opening ; 9 is the barrel or body containing the
gas passages. In this barrel the drop valve h works the stem of which protrudes
from the bottom of the barrel g and bears upon the short arm f' of the lever f, f*
of the cover or valve e so that as the long army of the said lever is raised to close
the air aperture in the chamber d, its short arm is lowered and permits of the
«<lescent of the drop valve h upon its seat to shut off the supply of gas from the gas
supply pipe g, to the chamber d. The passages in the body in which the
drop valve works are best seen in Figure 4. The drop valve is pressed to its
seat by the coiled spring i above it and the short arm of the air controlling cover
or valve e is pressed down, when at liberty to move, by the coiled spring k. Thus,
by the operation of the lever f, f' and its cover or valve e the air aperture ² and
the gas passage can be simultaneously opened or simultaneously closed.
The lever of the air and gas valves e, h is operated automatically in the following
manner. Under the said lever f, is the short arm 7 of the lever 1, turning on
the centre, the said lever extending to the axis of the stove. The end of the
short arm of the bottom lever bears against the end of the short arm of the
upper lever while the end of the long arm 2 of the said bottom lever is jointed
to the vertical rod or pin m in the axis of the stove.

page_text: When the store is not in use the parts occupy the respective positions represented
in Figure 1; that is, the cover or valve e closes the air aperture or opening d² and
the gas valve his pressed to its seat and the air and gas are thereby shut off from
the Bunsen burner. By the descent of the valve and the pressure of the
spring k the short arm of the bottom lever l, is lowered and the long arm and
its jointed rod m lifted.
When it is wished to use the gas stove for heating a saucepan or other vessel, the
vessel is placed on the stand e as represented in Figure 2. The rod m is thereby
made to descend, the bottom lever 1, is turned on its centre and its short arm Z
lifted. The short arm 2 of the other lever is at the same time lifted so as to raise
the gas valve from its seat and open the gas way or passage and the long arm f
of the lever ff made to descend so as to cause the valve e to uncover the
opening and permit of the entrance of air into the tubular chamber d and thereby
supply the mixture of gas and air to the burner as is well understood. Thus, the
placing of the vessel on the stand c simultaneously opens the gas way and air:
passage of the burner as represented in Figure 2. By lifting the vessel from the
stand c the two valves are simultaneously closed and the air and gas cut off from the
burner as represented in Figure 1.
.
As the air inlet is simultaneously closed with the gas inlet there is an absence of
explosive gaseous mixture within the tubular chamber d while the burner is out of
use, hence no explosion or igniting of gas inside the burner takes place on the
re-lighting of the burner.
p is a small bye pass tube for supplying with gas a permanently lighted jet p
near the principal gas jets b, b so that on automatically opening the gas and air
passages in the manner before described the gas is lighted.
The device or combination of parts described and represented as applied to
a stove may also be applied to cooking ovens heated by Bunsen burners. In this
case the weight placed on the bottom of the oven and depressing the rod m, opens
the gas drop valve and air valve or cover in the manner before described.
Instead of automatically opening and closing the gas and air passages of the
Bunsen burner by the placing of a vessel or article upon or its removal from the
gas stove or oven bottom the said opening and closing of the air and gas passages
may be effected by hand. In this case the air valve or cover is opened or closed by
the opening or closing of the gas tap or valve.
This modification may be applied to borizontal as well as to vertical Bunsen
burners. We have represented it applied to a vertical, Bunsen burner in Figures 5
and 6 which represent elevations taken at right angles to one another; 7 is the gas
passage opening axially into the vertical tubular chamber to which air is
supplied by the opening or passage 2; s is the gas tap or valve the plug of
which crosses the gas passage q; tis the valve or cover for closing and uncovering
the air inlet or passage in the chamber through which chamber the
gaseous mixture passes on its way to the jets. The said valve or cover t is carried
by the lever t, turning on the centre t the lower arm of the said lever being
cranked and bent horizontally. On the plug and external to the body of the
valve, is a cam u for opening or closing the air valve or cover t simultaneously with
the opening or closing of the gas passage q. When the plug is so turned as to
open its way or passage to the gas pipe q, the cam u on the end of the plug is taken
out of action and the air valve t is opened by the pressure of a coiled spring v or
other spring, between its upper arm and the chamber r or by a plate spring bearing
on the lower arm as indicated by the dotted line at w Figure 6, the several parts of
the burner now occupying the respective positions represented in Figures 5 and 6.
Thus, the opening of the tap or valve to admit gas into the chamber r simultaneously
opens the air inlet in the said chamber by the lifting of the cover or valve t.
On closing the tap to cut off the supply of gas to the burner, the cam u at the same
time acts upon the lower horizontal arm of the valve t and closes the said valve
upon the air inlet passage as indicated in dotted lines in Figure 6. As the valve t

page_text: is closed its spring is compressed ready to open the said valve on the opening of the
gas valve or tap and the taking out of action of the cam u.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that we claim
as our invention :-
The new or improved device for preventing the explosion or the igniting of the
gas inside gas burners of the kind called Bunsen burners hereinbefore described and
illustrated in the accompanying drawings, the said device consisting essentially of
a cover or valve applied to the tubular chamber of the Bunsen burner for permitting
of the opening or closing of the air inlet or aperture in the said chamber,
simultaneously with the opening or closing of the gas valve or tap of the burner,
whether the air cover or valve be worked by a lever automatically operated in the
manner described or by the turning of the gas tap or valve substantially as described
and illustrated.
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CHARLES FREDERICK NEWTON HALL.
THOMAS WILLIAM JAMES: