IMPROVEMENTS IN GRATE BARS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said John Dean at the Office of
the Commissioners of Patents on the 8th October 1880.
JOHN DEAN, of Waterloo Mills, Bradford, in the County of York, Engineer.
"IMPROVEMENTS IN GRATE BARS."
The object of my Invention is to construct furnace grate bars in such a manner
that the attendant can remove the clinkers and spent ashes from off the whole
length of the bars without having occasion to open the furnace door.
I accomplish my object in the following manner :---
I construct the front and back dead plates with a number of journals corresponding
to the number of sections of bars with which the fire grate is composed. Each section
of bars extend the length between the dead plates, and are of such a width that
when all the sections are level fill the width of the furnace. The end of each section
is arranged with a projection that rests in the aforesaid journal, the front projection
extending the width of the front dead plate, and arranged at the end for the
reception of a lever.
When it is desired to clear the clinkers and spent ashes from off any one section,
a lever is applied to the front projection or journal shaft of the same, and the bar
turned completely over, dropping all the clinkers and ashes into the ashpit.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Dean in the Great Seal Patent Office on the 8th April
1881.
JOHN DEAN, of Waterloo Mills, Bradford, in the County of York, Engineer.
"IMPROVEMENTS IN GRATE BARS."
The object of my Invention is to construct furnace grate bars in such a manner
that the attendant can remove the clinkers and spent ashes from off the whole
length of the bars without having occasion to open the furnace door, and consists
in arranging the fire grate in sections, each section being carried by journals formed
in the front and back dead plates, and the sections built up with loose bars in order
that the same may be free to expand or contract; these are secured in such a
manner that the whole section can be completely turned over, dropping the clinkers
and ashes into the ashes pit.
In the accompanying Drawings Figure 1 represents an end elevation of a circular
fire box fitted with my improved bars, one set of which is shewn tilted; Figure
is a plan of the same; Figure 3 is a longitudinal section through the furnace tube;
and Figure 4 a longitudinal section through line a, b, of my improved bars. Similar
letters represent similar parts in all the Figures.
The front and back dead plates are indicated by the letters A and B respectively,
in which are formed journals C and D for supporting the grate-bars; these bars
extend the full length between the dead plates, and at the ends of the said bars I
form boxes E and F for the purpose of securing the loose side bars G. Projecting
from these boxes E and F are bosses forming the projecting axle of the said bar,
which rests in the journals C and D before mentioned. These projecting axles are
covered by plates P and R for the purpose of keeping the same free of ashes.
The spaces at the sides of the centre bars H that connect the front and back
boxes together may be filled in with bars cast singly or with two or three cast
together. In the Drawings I have shewn two cast together, which are secured in
position in the following manner, and are easily removed in case one is broken or
burnt:-
On each end of the centre grate bars H are cast the boxes E and F, as before
mentioned; the boxes E at the back end are cast with the covers on, those at the
front end are cast with an open top; and when the side bars G are placed in
position the back ends go into the recesses formed by boxes E, and the front ends
in boxes F, which are covered by plate K, secured thereon by bolts passing through
the same and the bottom flange of boxes, leaving the bars free to expand or contract
at will.
When it is desired to clean the clinkers and spent ashes from off either section of
the bars, the catch L passing through front dead plate flange into opening in end
of box E is withdrawn, and a lever inserted in square opening M formed in end of
front axis of furnace bars; on turning this lever either way the bars are turned
completely over, all the clinkers and ashes falling into the ash pit, the live fire
remaining on the other set of bars, and on opening the furnace door the fire can be
spread over the cleaned bars, leaving the clinkers, which can be removed therefrom
in the manner as before described; thus it will be seen the clinkers are removed
from the bars without having occasion to open the doors or to draw the clinkers, as
is now the common practice, the furnace door being only required to be opened
when the fire is spread and fuel supplied.
What I claim as my Invention is,―
The arrangement and combination of sectional fire bars mounted in journals,

page_text: substantially in the manner and for the purpose herein set forth and as illustrated
by the accompanying Drawings.
In witness whereof, I, the said John Dean, have hereunto set my hand and
seal, this Sixth day of April, in the year of our Lord One thousand eight
hundred and eighty one.
Witness,
JOHN WAUGH,
Engineering and Patent Offices,
Bradford.
JOHN DEAN. (LS)

page_text: សម
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