A New or Improved Compound Fire Bar capable of Rotation for Horizontal and Inclined Furnace Grates.
Year: 1892

page_text: Date of Application, 16th Dec., 1892-Accepted, 21st Jan., 1893
VOMI DUIN DI PUITIVATION,
A New or Improved Compound Fire Bar capable of Rotation for
Horizontal and Inclined Furnace Grates.
I, NEWNHAM BROWNE, of 73 Cheapside, in the City of London, Chartered
Patent Agent, do hereby declare the nature of this invention and in what manner
the same is to be performed which has been communicated to me by Alfred
Hermann Vater, Agent for Mines and Smelting Works, at Dresden, in the Empire
of Germany, to be particularly described and ascertained in and by the following
statement:
This fire-bar offers the advantages, not only that it presents the largest possible
free grate surface, i.e. such a one as presents the largest number of apertures for
admitting air to the fire in the most even distribution, but also that, when one
surface shows wear, the bar can be turned and can thus be used more than once.
Such a furnace-bar or fire-bar, consists, as shown in the drawings of a number of
separate plates a of even thickness and either in the shape of an equilateral
triangle (Fig. 1) or in that of a square (Fig. 3).
Centrally these bars a have a hole b triangular equilateral in the first case,
square in the second; in each case so made that each corner of the hole is towards
the middle of one side of the outer surface.
The plates or bars may be made of cast iron or wrought iron, or where large,
surfaces are permissible or even desirable of fire clay or of other fire resisting
material.
If the plates or bars consist of any material that can be cast, then one face of
each is made with a raised rim 6' surrounding the hole b. When the material is
wrought, rings, triangular, or square, as required, and of the same internal
dimensions as the holes, are substituted for the raised rims.
From these bars or plates a. having rims or rings b'a fire bar is built up by
threading said plates a upon an iron bar c of corresponding triangular or square
cross section, as shown in Fig. 5, in such manner that between every pair of plates
a rim or ring b is found, the thickness of the rim or ring determining the distance
between the plates. The length of the bearing or supporting bar and the number
of plates a and rings 6 thereon is, of course, determined by the extent of grate
surface to be produced. By suitable choice of the thickness of the rims or rings
the width of the spaces between the plates a in the fire bar may be determined
according to the fuel chosen.
By a pin at each end of the bearing bar c or by other convenient means the
plates a are pressed together. The ende of the bar e project at both sides beyond
the row of plates a so as to allow the firebar to be laid on its supports.
Fig. 6 of the drawings shows how a horizontal grate is constructed from such
fire-bars, and
Fig. 7 the construction of an inclined grate.
It is clear from the foregoing description that, when a firebar has become
defective by one of its sides being burnt out, it only requires to be turned, and then
will present a fresh surface so making the grate surface uniform again.
Experience teaches that the middle portions of a firebar are most subject to wear
becoming unfit for use while the rear part and front do not require renewal so soon.
If this takes place with the firebar in question it is only required to exchange the
plates a for new ones and the fire-bar is fit for use again.
Warping of the plates is not anticipated as the expansion of the edges is but
slight and the two faces (or three) exposed to the air will, rising between the
plates a will, by cooling counteract the heating of the top surface.
As in rising to the combustion chamber (the furnace properly so called) the air
Го

page_text: has to pass the relatively large heated surfaces of the plates, its temperature is so
much raised, as to be calculated to promote perfect combustion of the fuel.
No obstacle is presented to the falling through of the ashes as the bearing bar c.
with the rims or rings b' surrounding the same, presents oblique surfaces, by reason
of the peculiar arrangement adopted as set forth.
When very large plates a are used, it may be advantageous to employ more than
one bearing bar c.
Having now particularly described and 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 :-
A firebar for horizontal and inclined grates surfaces characterised by triangular
or square plates a having triangular or square holes 6 at the centre, the holes being
furnished with rims on one side of the plate (instead of which rims, rings may be
used, separately made) these being with the plates threaded upon a rod c corre-
sponding in cross section to that of the holes, and are so held together by suitable
means that between every pair of plates there will be a rim or ring (thus forming
spaces between the plates) the whole for the purpose of allowing the bar to present
a fresh surface when turned, in lieu of a damaged one, and to admit ready exchange
of the more rapidly worn parts of the fire-bar.
Dated the 16th day of December 1892.
בדורז.
בד זרזז-ר
NEWNHAM BROWNE.