Improvements in Burners for Gas Fires in Ordinary Coal Grates.
Year: 1893

page_text: Date of Application, 25th Jun., 1893—Accepted, 25th Feb., 1893
COMPLETE SPECIFICATION.
Improvements in Burners for Gas Fires in Ordinary Coal Grates.
We, THOMAS FLETCHER and Alfred Clare both of Thynne Street, War-
rington, in the County of Lancaster, Manufacturers of Gas Apparatus, 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:―
In gas burners for use with lump asbestos or asbestos balls and the like in
ordinary coal grates, as at present generally constructed, the gas frequently lights
back to the jet, and it is the object of this invention to prevent this defect.
In the burners to which our improvements are applicable, there are two co-axial
jets pointing in opposite directions in a duplex co-axial injection tube parallel or
approximately parallel with the combustion tube. The duplex injection tube is
joined at each end to the combustion tube by a simple bend. Our improvements
consist in the introduction of an additional curve or bend at the point where the
injection tubes join the combustion tube.
We will more particularly describe our invention with reference to the accom-
panying drawings in which
Figure 1 is a front elevation; Figure 2 a cross section along the line -y Figure 1;
Figure 3 a cross section along the line y Figure 1; Figure 4 a plan; and
Figure 5 an end view of a burner in which the additional bend or curve is in an
upward direction.
Figure 6 is a plan; Figure 7 an end view; and Figure 8 a front view of a burner
in which the additional curve or bend is in a downward direction.
The gas supply nozzle and the jets are not represented in the drawings as they
are of the usual well known construction, the jets being arranged on each side of
the centre of the injection tube and pointing respectively in opposite directions
towards the bends which connect the injection tube with the combustion tube.
A is the injection tube; B B the additional curves or bends; and C, the com-
bustion or burner tube which may be parallel with the injection tube, or curved as
represented by the drawings.
The degree of inclination of the additional bends B B with reference to the
general plane of the burner may be from 30 to 60 degrees and the amount of
deviation in the path of the mixed air and gas produced by the bends should be
from one to one and a half diameters of the tube, the latter amount of deviation
appearing to produce the better result. We do not limit ourselves however to the
angles or the amounts of deviation produced by the bends hereinbefore described
since these may be varied within comparatively wide limits without materially
impairing the beneficial results secured by our improvements.
The effect of the additional bends is, in the case of a check to the current from
draughts or from other causes, to prevent the flame lighting back to the jets, and
this appears to be produced by the accumulation in the bends of an irregular
mixture of air and gas through which an explosion does not readily pass.
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 :-
:-
Burners for gas fires in ordinary grates, having additional bends or curvatures
between the injection and combustion tubes, constructed substantially as and

page_text: for the purpose hereinbefore described and as illustrated by the accompanying
drawings.
n
1000
WILLIAM E. HEYS,
Agent for the Applicants.