Improvements in Furnace Bars and their Frames and in the Mode of Fixing the same, also in the Firebridges used in connection therewith.
Year: 1890

page_text: Date of Application, 20th Oct., 1890
Complete Specification Left, 20th July, 1891-Accepted, 22nd Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Furnace Bars and their Frames and in the Mode
of Fixing the same, also in the Firebridges used in connection
therewith.
I, HOWARD MATRAVERS ASHLEY, of Ferrybridge in the County of York,
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
FURNACE BARS & THEIR FRAMES & IN THE MODE OF FIXING THE SAME, ALSO
IN THE FIREBRIDGES USED IN CONNECTION THERE WITH to be as follows:-
In carrying out my invention for improvements in furnace bars & their frames,
& in the mode of fixing the same, also in the firebridges used in connection therewith
I construct a set of bars very similar to those commonly used, but through the
blocks which usually rest on the flange of the dead-plate I make a groove on the
under side of it. I then construct the edge of the dead-plate at the back of
the furnace of an angular section, & with a long slot in the vertical side of it so
that air partly heated in passing underneath the bars, may pass thro' the flutes in
the ends or blocks of the bars, & thro' the slot in the vertical part of the angle, &
so underneath the dead-plate. And at a certain distance back from the angle, I
form another slot but through the face of the dead-plate, so that the heated air can
pass up through it into a space left between two walls which together form the
fire-brick bridge, & which are contracted in such a manner towards the top or
outlet, that the air becomes highly heated by being compelled to impinge upon the
face of the red-hot bridge, and so ignites the gases that have escaped combustion
until they pass over the bridge & meet the air.
Preferably, I make the bars with a groove all along the centre of the face, so as
to hold a considerable amount of ashes; and so prevent the fuel from over-heating
& adhering to them.
Dated this Eighteenth day of October 1890
H. M. ASHLEY.
COMPLETE SPECIFICATION.
Improvements in Furnace Bars and their Frames and in the Mode
of Fixing the same, also in the Firebridges used in connection
therewith.
I, HOWARD MATRAVERS ASHLEY, of Ferrybridge in the County of York,
Engineer, 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 :-
My invention is applicable to all descriptions of furnaces & boiler fires. And
tho' in the drawings that accompany this Specification, i show the furnace bars
with a shallow flute running from end to end of the top or face of the bar, I do not
claim this flute as novel, nor is it essential to the successful working of my
invention, the main objects of which are--To obtain a furnace bar that shall be
thoroughly durable, by being kept comparatively cool as the result of the heat
which is absorbed from the fuel being carried off from the lower faces of the bar,
by means of the current of air, which is able to flow from the front of the bars in
an unbroken course to the back of the fire & after thus becoming greatly heated to
be brought into contact with the smoke, as it leaves the surface of the fire, which
it ignites, & so consumes it. And I accomplish these results in the following
manner.

page_text: The letters on the accompanying sheet of drawings will be found to correspond
in all the four figures.
Fig. 1. is a transverse section of a Cornish boiler flue with the back dead-plate,
or frame of my system of carrier, drawn thro' the face of the plate marked F in
Fig. 2. & right upwards, so as to shew the face of the brick wall E. Fig. 1. & 2.
Fig. 2. is a longitudinal section thro' the whole tube to the back of the firing
arrangement & bridge drawn a little to the right of middle D. Fig. 1.
Fig. 3. is a transverse section of the tube or flue of the boiler as Fig. 1. but
drawn across just at the front of the flange shewn at C. Fig. 2.
Fig. 4. is an end view of the furnace bar without any of its connections.
I will now describe & compare the various figures & details.
H. H. Figs. 1. 2. & 3. section of the flue plates of the boiler. A. A. Fig. 2,
& A. Fig. 4 are furnace bars. B. Fig. 2. front dead plate. C. Fig. 3. & C
Fig. 2. the central carrier for the furnace bars. A. A. & D. D. Figs. 1. & 2. back
perforated plate for carrying the bars. "E. Figs. 1. & 2. front wall of the bridge.
E' Fig. 2. back wall of the bridge, which leans over at the top towards E to
contract the flue G. F. Figs. 1. & 2. door or plate covering manhole into ashes
cavity G' beneath the flue or hot air current G. a Figs. 2. & 4. oblique groove or
perforation in the otherwise solid blocks, at the ends of the bars & which come
opposite to the perforations d, d Figs. 1. & 2. & similar perforations c, c, c,
Figs. 2. & 3.
By following the foregoing description of the various parts, the working & effect
of this system of firing will be obvious.
When the fuel is thrown into the fire in the ordinary manner, the cold air
passing in underneath the deadplate B, is drawn along between the bars, part of it
of course being drawn thro' the bars & thro' the fuel for combustion in the usual
way, but the greater part of it, being pressed up between the ribs of the bars by
the weight of the cold air beneath it is drawn along between them until it reaches
the carrier bar C, & passing up thro' the oblique flutes a, & thro' the perforations
in the carrier e; it is able to flow again between the webs of the next row of bars,
becoming more heated still; until reaching the back frame D Figs. 1. & 2. it
passes thro' the perforations d. d. Figs. 1. & 2. & up thro' the cavity G formed by
the brick walls, E. & E¹ & by the contraction of the space towards the outlet it
impinges with such force upon the red-hot surface of the front wall E as to become
heated enough to fire the products of combustion passing over the top of the com-
pound bridge E. & E. It will be clear from this description, that all the air
drawn in below the deadplate B, that has escaped being drawn thro' the bars &
fire, will have been able to flow in an unbroken course, from dead-plate B to the
outlet above & between E, & E'.
Having now particularly described & ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
(1.) In improvements in furnace bars & their frames & in the mode of fixing the
same, a bar such as described with a groove or slot thro' one or both ends of it as
& for the purpose described & shewn.
(2.) A perforated carrier bar, & a perforated plate for the back of the fire, for
the purpose & as described & shewn.
(3.) The combination of a furnace bar having a perforated or fluted block at one
or both ends, with such a carrying bar & such a perforated plate at the back of the
fire, as described & shewn.
(4.) The general construction & combination of a deadplate B furnace bars A. A.
carrier bar C & perforated plate D, with firebrick bridge & cavity E. & E¹
G. & G¹ as described & shewn.
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TL 1001