Improvements of and in connection with Hollow Water-cooled Firebars.
Year: 1898

page_text: Date of Application. 29th June, 1898-Accepted, 10th Sept., 1898
COMPLETE SPECIFICATION.
Improvements of and in connection with Hollow Water-cooled
Firebars.
I, ERNST JOSEPH KOESTER, of Purgstall-on-Erlaf, in the Empire of Austria, Gentle-
man, 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 :-
This invention relates to improvements of and in connection with hollow water-
cooled firebars, and has for its object the obviation of a disadvantage hitherto attach-
ing to such bars, namely the joints connecting the hollow bars with the feed supply
and outlet for the water are, in existing systems, gradually rendered leaky as a result
of the expansion of the bars under the influence of heat.
In addition to this, several other important advantages are possessed by the inven-
tion, and distinguish it from all known forms of this kind of firebars.
In the accompanying drawings, which enable the particulars of the invention to be
more easily made clear:
Fig. 1 shows a perpendicular longitudinal section through the hearth-plate and
front end of one of the firebars, together with the feed arrangement and the seating
of the bar.
Fig. 2 is a cross-section of the curved pipe.
Fig. 3 a cross-section of the receiver (x-x).
Fig. 4 a top view of front end of the firebar.
Fig. 2, 3 and 4 are drawn on twice as large a scale as Fig. 1.
The cooling water is delivered from the feed tank G, via the tap H and pipe 1
or I¹ into the curved pipe K, whence it falls freely, without the intervention of any
tight joint or connection, into the receiver L, this latter forming one piece with the
firebar, and then enters the hollow of the bar, through which the water flows and
escapes over the ridge N at the further end, into the outflow tank 0, from which it
is discharged in any suitable manner. The tap H serves to cut off the feed water
supply when the firebar has become leaky or for any reason is required to be taken
out.
The object of the pipe I or 1¹ is to connect the nozzle g, which is of circular
section with the curved pipe K, the section of which is shewn in Fig. 2. This oval
section is designed in the first place to enable the pipe to be inserted in the recess p
(Fig. 3) found in the receiver L, and also to allow room enough for the arrangement
side by side of the several curved pipes, supplying the entire set of firebars in the
grate, without reducing their sectional area. The tapped nozzles g being of circular
section and therefore of greater diameter, with their connecting pipes I and I¹ must
be set at different angles, as is shewn in Fig. 1, in order to find space. The curved
pipes I and I may also be replaced by suitable tubing.
At the front end of the receiver L an overflow aperture P is provided, leading to a
waste pipe Q; and the lower lip of this aperture P is at a somewhat higher level,
than the upper edge of the hollow M of the firebar, so that the bar is filled with
water before the latter begins to overflow. On the other hand the upper lip of the
aperture P is below the level of the top of the receiver and consequently the water
cannot come over the top of the latter. The overflow water from the waste pipes is
collected in a tank R and discharged thence by any suitable conduit.

page_text: For the support of the curved pipes K a thickened Bange is provided on the
receiver L. At the further end, the hollow of the receiver L is continued in that of
the bar and the latter debouches into the common outflow tank O.
Underneath the front end of the firebar a flange S¹ is provided, and the bars are
supported by a girder T¹ hollowed out on the upper surface t2 for the reception of the
guide flange St. When in the operation of stoking the fire, a bar is pushed towards
the back of the grate, the vertical face 8¹ of the flange S¹ comes in contact with the
vertical extremity of the hollow t¹ and arrests the rearward mouvement of the bar. A
similar flange S2 is provided at the rear end of the bar, and the vertical face 82 of this
flange, by coming in contact with the vertical wall of the hollow t2, prevents the bar
from slipping forwards. Since the hollow in the front girder extends farther forwards
than the flange S¹, and that in the rear girder farther backwards than the flange S2
a free space is thus left at both extremities for the expansion of the bar under the
influence of heat.
When a firebar, for any reason, is to be taken out of the grate, the tap H is turned
off, the curved pipe K taken out of the recess in the receiver L, and turned towards
the front, and the bar simply drawn out after being lifted from its seating at either
end. To replace the bar, it merely pushed in, until both flanges have dropped into
the corresponding hollows on the girders.
In place of the two flanges a single one can be substituted; or else the firebars
can be held in position on the girders in any other suitable manner.
The outflow tank is provided with a cover V on which rests the masonry of the
firebridge, and which is fitted in front with a separate tank W, kept cool by water and
serving as a cover for the opening, receiving the rear end of the firebars. The
cooling water is introduced into W at the side and escapes through a discharge
pipe w into the outflow tank 0. An aperture 202 is provided for the escape of the
steam formed in W, into the cover V, which latter also receives the steam escaping
from the firebars and discharges it through a lateral aperture. The tank O is also fitted
with a conduit for the removal of the water it has collected.
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. Water-cooled firebars inade in one piece and provided with a single longitudinal
hollow space, the said firebars being connected with the feed supply and the outlet
in such a manner, that no tight joints are employed, and consequently the bars
may freely expand under the influence of heat, substantially as set forth and shewn
in the drawings.
2. In connection with water-cooled hollow firebars, the application of tapped
feed pipes or tubes, which debouch freely, without the intervention of any tight
joint, from above into the several bars, substantially as set forth and shewn in the
drawings.
3. In connection with water-cooled hollow firebars the application of a common
outflow tank, into which all firebars discharge freely, tight joints being completely
dispensed with, substantially as set forth and shewn in the drawings.
4. In connection with water-cooled hollow firebars, the use of girders supporting
the bars, arranged in such a manner, that they allow the bars to freely expand at
both extremities, when under the influence of heat, substantially as set forth and
shewn in the drawings.
5. In connection with water-cooled hollow firebars, a cover for the outflow tank, to
support the nasonry of the firebridge the said cover being fitted in front with a
separate tank which is kept cool by water and serves as a cover for the opening, into
which the rear end of the firebars fits, substantially as set forth and shewn in the
drawings.
6. In connection with the firebars set forth in the First Claim, the employment
of flanges provided at or near the extremities of the bars, and fitting into hollows
in the supporting girders in such a manner, as to allow the expansion of the bar

page_text: under the influence of heat, substantially as set forth and shewn in the
drawings.
7. In connection with the firebars set forth in the first claim, the employment of
feed water pipes of oval section, for ready insertion into the hollow bar and for
preserving the sectional area of the pipes, whilst allowing room for their arrangement
side by side, substantially as set forth and shewn in the drawings.
8. In connection with the firebars set forth in the First Claim, the arrangement of
the tapped nozzles, so as to project at different angles from the feed water tank,
substantially as set forth and shewn in the drawings.
DL: 00th den
Ian 1000