IMPROVEMENTS IN FIRE GRATES FOR MARINE AND OTHER STEAM BOILERS to be as follows:-
Year: 1884

page_text: I GEORGE MEAD of St Helier, No 183 Richmond Road, Cardiff, in the county
of Glamorgan, Superintendent Engineer do hereby declare the nature of the
said invention for "IMPROVEMENTS IN FIRE GRATES FOR MARINE AND OTHER
STEAM BOILERS to be as follows:-
"
This invention relates to improvements in the construction and method of fixing
fire grates for burning small coal in marine boilers.
In carrying out my invention I make the fire bars of round wrought iron fixed in
two tiers or rows the bars of the first or upper tier extend the whole length of the
furnace and rest upon transverse bearing bars and are equidistant so as to allow
about an inch of air space between each bar, the bars of the second or lower tier
are made in two lengths fitting between the front, middle and back bearing bars
and resting upon a second set of bearing bars; the fire bars of the lower tier are
like those of the upper tier equidistant so as to allow about an inch of air space
between each bar; the said second or lower tier of bars being fixed directly under
the air space of the upper tier of bars and at a sufficient distance below the upper
tier to allow of an air space of about three eighths of an inch between the said
upper and lower bars.
The three transverse bearing bars are made of cast iron and have grooves formed
in their top edge of a size suitable for carrying the said round fire bars; the front
and back bearing bars are made double for carrying the top and bottom tiers of
fire bars the outer part carrying the top tier of bars and the inner part of less depth
carrying the bottom tier of bars there being an air space between the said outer
and inner parts, but these parts are connected or cast together; the centre bearing
bar is similar in construction to the front and back bearing bars and has a centre
portion for carrying the upper tier of bars and a part of less depth fixed or cast to
each side of the said centre piece for carrying the lower tier of fire bars; an air
space is left between the said centre part and the two outer parts; by these
improvements the air space will be increased by about one fourth and as a pricker
can be used at an angle of forty five degrees the whole of the coal and clinker
resting upon the fire bars can be disturbed.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicant.

page_text: "
I GEORGE MEAD of St Helier N° 183 Richmond Road Cardiff in the County of
Glamorgan, Superintendent Engineer do hereby declare the nature of my invention
for "IMPROVEMENTS IN FIRE GRATES FOR MARINE AND OTHER STEAM BOILERS
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 improvements in the construction and method of fixing
fire Grates in Marine and other Steam Boilers for the purpose of allowing small
Coal to be burnt in the said grates.
In carrying out my invention I make the fire bars of round, square or
hexagonal wrought Iron fixed in two tiers or rows; the bars of the first or upper
tier extend the whole length of the furnace passing underneath the front dead
plate, and projecting a short distance outwards; they rest upon transverse Bearing
Bars, and are equidistant so as to allow of about one inch and a half of air space
between each bar; the bars of the second or lower tier are made in two lengths
fitting between the front, middle, and back Bearing bars, and resting upon a second
set of Bearing bars; the fire bars of the lower tier are like those of the upper tier
equidistant and are fixed directly under the air spaces of the upper tier of bars, and
at a sufficient distance below the upper tier to allow of an air space of about half
an inch between the said upper and lower tiers of Bars.
The three transverse bearing bars are made of cast or wrought Iron, and have
grooves formed in their top edge of a size suitable for guiding and carrying the
said round, square, or hexagonal fire bars; the front and back bearing bars are made
double for carrying the upper and lower tiers of fire bars, the outer part carrying
the upper tier of bars, and the inner part of less depth carrying the bottom tier of
Bars, there being an air space between the said outer and inner parts, but these
outer and inner parts are connected or cast together; the centre Bearing Bar is
similar in construction to the front and back bearing Bars, and has a middle
portion for carrying the upper tier of fire bars, and a part of less depth fixed or
cast to each side of the said middle piece for carrying the lower tier of fire bars;
an air space is left between the said middle part and the parts on either side of the
middle part.
In order to enable my invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which Figure 1 represents a
longitudinal sectional elevation of a fire grate for marine and other steam boilers
constructed according to my invention; figure 2 is a plan and figure 3 a transverse
section of the same. Similar letters in all the figures represent similar parts.
A is the first or upper tier of fire bars, and B the second or lower tier of fire
bars; C. C. C are the transverse bearing bars for carrying the upper tier of
fire bars and D. D. D. D. the transverse bearing bars for carrying the lower tier of
fire bars, the said bearing bars D being of less depth than and connected or cast to
the bearing bars C; E, front dead plate; F, shew the ends of the upper fire bars
projecting beyond the front of the dead plate E. In the drawing the fire bars are

page_text: shewn round in cross section but it will be obvious that other forms of bars may be
employed. By these improvements the air space will be much greater than in fire
grates of ordinary construction in which about two thirds or three fourths of the
area of the furnace are taken up by the fire bars whereas in this arrangement only
about one half the area is so taken up thereby increasing the air space by about
twenty five to thirty per cent; the combustion is greatly assisted as the air is
quite cold when it comes in contact with the fuel, and by keeping the bars cool
they are rendered much more durable; further by allowing of burning small coal
instead of large coal a saving of about forty to fifty per cent is effected. A pricker
can be used at an angle of forty five degrees and the whole of the coal and clinker
resting upon the fire bars can be thereby disturbed.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The construction of the transverse bearing bars having grooves in their top
edges for regulating and keeping the wrought iron fire bars in their proper positions
substantially as hereinbefore described and represented in the accompanying
drawing.
2. The herein described method of arranging the fire bars in two tiers the bars
forming the lower tier being placed exactly under the air spaces of the bars forming
the upper tier thereby preventing the small coal from falling through without
checking the draught as herein before described and represented in the accompanying
drawing.
3. The improved fire grate for marine and other steam boilers hereinabefore
described and represented in the accompanying drawing.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicant.