GENERATING STEAM IN STEAM BOILERS, AND PROTECTING THE GRATE BARS IN THE FURNACES UNDER THE BAID BOILERS
Year: 1869

page_text: LETTERS PATENT to Noah Shaw, of Eau Claire, Eau Claire County,
State of Wisconsin, United States of America, for the Invention
of "GENERATING STEAM IN STEAM BOILERS, AND PROTECTING THE GRATE
BARS IN THE FURNACES UNDER THE BAID BOILERS."
Sealed the 22nd December 1869, and dated the 8th November 1869.
COMPLETE SPECIFICATION filed by the said Noah Shaw at the Office
of the Commissioners of Patents, with his Petition and Declaration,
on the 8th November 1869, pursuant to the 9th Section of the
Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, NоAH
SHAW, of Eau Claire, Eau Claire County, State of Wisconsin, United
States of America, send greeting.
WHEREAS I am in possession of an Invention for "GENERATING STEAM
IN STEAM BOILERS AND PROTECTING THE GRATE BARS IN THE FURNACES UNDER THE
SAID BOILERS," and have petitioned Her Majesty to grant unto me, my
executors, administrators, and assigns, Her Royal Letters Patent for the

page_text: same, and have made solemn Declaration that I am the first and true
Inventor thereof.
NOW KNOW YE, that I, the said Noah Shaw, do hereby declare
that the following Complete Specification, under my hand and seal,
fully describes and ascertains the nature of the said Invention, .and
in what manner the same is to be performed, in and by the following
statement:-
The nature of my Invention consists, first, -in conducting a current of
water from a steam boiler under and at the sides of the fire under said
boiler, generating steam during such passage, and conducting the steam
and water back into the boiler.
Second. In the means employed for conducting a current of water
from a steam boiler under and at the sides of the fire under said boiler,
and conducting the water and steam generated during such passage
back into the boiler.
Third. In conducting a current of water from a steam boiler into and
through the space between the bridge wall and said boiler, generating
steam during such passage, and conducting the steam and water back
into the boiler.
Fourth. In the means employed for conducting a current of water
into and through the space between the bridge wall and said boiler, and
conducting the water and steam generated during such passage back
into the boiler.
And, fifth. In the construction and use of auxiliary grate bars, by
means of all of which I am enabled to produce or generate more steam
with less fuel, and at the same time protect the grate bars from burning
out too rapidly.
In order to enable others skilled in the art to which my Invention
appertains to make and use the same, I will now proceed to describe its
construction and operation, referring to the accompanying Drawings
which form a part of this Specification, and in which Figure 1 is a
transverse vertical section, and Figure 2, a perspective view of a steam
boiler and furnace with my improvement attached.
Figure 3 is a perspective view of the auxiliary grate bar, and Figure 4
is a vertical cross section showing the manner in which the auxiliary
grate bar is used.

page_text: A represents a steam boiler made in any of the known and usual ways,
and of any size or dimensions desired; B is the furnace or fire-placo
under said boiler. On each side of the boiler A are attached three pipes,
one C near the front end, the second D at or near the centre, and the
third E near the rear end of the boiler. These pipes are all connected
with the boiler on a line at the centre of the boiler, as seen in Figure 2.
The front pipe C runs horizontally outward so as to come on the outside
of the furnace or fire-box, then downward perpendicularly, so that its
lower end will come below the level of the fire-box; it is then turned
inwards and runs under the fire-box to about the centre of the same,
here it is turned upwards for a very short distance, and then placed in
a tortuous position running back and forth at the bottom of the fire-box
forming one-half of the grate, then up along the same side of the fire-box,
continuing its tortuous or winding course the whole height of the same,
until it at last connects with the centre pipe D. The half of the grate
thus formed by the tortuous pipe O is not horizontal but slightly inclined
from the centre upwards toward the side, although it is in a plane
parallel with the boiler longitudinally, as seen in Figure 1. There being
one pipe O, as above mentioned, on each side of the boiler, and both
running in the same manner and shape, it will be seen that the entire
bottom and sides of the fire-box are thus provided with hollow grate bars
connected with the boiler. The water in the boiler passes through the
pipe C, and is during its passage under and at the sides of the fire
partially converted into steam, which by the inclined position of the pipe
in the fire-box is caused to ascend through said pipe and pass into the
boiler through the pipe D. Thus a continuous current of water may be
kept passing from the boiler, this water being converted into steam, and
the steam and water returned to the boiler. At a suitable point in
the pipe C is a check valve a, which allows the water to flow freely in
the direction above described, but prevents it from going in the opposite
direction, if such should be at any time its tendency.
I do not of course confine myself to the specific turns or bends of thic
pipe C as above set forth, but desire to include any and every mode by.
which a current of water is conducted from the boiler through suitable
means or devices under and at the sides of the fire, there converted into
steam, and with the water returned to the boiler. The pipe E also leads"
outward and downward from the boiler on one side, it passes in rear of
the fire-box, where it takes a tortuous and winding course back and forth.

page_text: between the bridge wall and the boiler, inclining upwards toward the
other side, thence it extends up and enters the boiler on the opposite
side from where it left the boiler. Water passes in like manner through
this pipe from the boiler, is converted into steam, and in this condition
with the water returned to the boiler. This pipe is also provided with a
check valve b, to allow or cause the current to flow only in one direction.
Between each coil of the pipe C that forms the grate in the fire-box is
placed an auxiliary grate bar d, the sides of which are curved inwards, as
shown in Figures 3 and 4, and provided with curved ribs e, e, so as to fit
on the pipe C. The ribs e, e, are placed at any suitable distances apart,
forming air or draft holes for the fire.
The advantages of my Invention are obvious. The grate bars formed
by the tortuous or winding course of the pipe C are preserved from
burning out too rapidly, as they are kept comparatively cool even with
the hottest fire. As there is a vastly increased heating surface without
increase in the size of the fire-box, more steam can be made with less
fuel than in ordinary boilers, and hence the expense is materially
lessened.
Having thus fully described my Invention, what I claim as new and
desire to secure by Letters Patent is,―
1st. Passing a continuous current of water through suitable devices
from a steam boiler under and at the sides of the fire, converting it into
steam, and returning the steam and water into the boiler, for tho
purposes herein set forth.
2nd. Passing a continuous current of water through suitable devices
from a steam boiler between the bridge wall and said boiler, converting
it into steam, and returning the steam and water into the boiler, for the
purposes herein set forth.
3rd. Providing the fire-box of a steam boiler with hollow grate bars
on the bottom and sides, and the space between the bridge wall and the
boiler with a tortuous pipe, all connected with the boiler, substantially
as and for the purposes herein set forth.
4th. The auxiliary grate bar d provided with ribs e, e, substantially as
and for the purposes herein set forth.
5th. Providing the fire-box B with one tortuous pipe or several pipes
connected together so as to form the bottom inclined upwards from the

page_text: centre towards the sides, and extending up the sides, substantially as
herein set forth.
6th. The combination of the boiler A with pipes C and D, connecting
said boiler with the inclined pipe or pipes running along the bottom and
sides of the fire-box B, substantially as and for the purposes herein
set forth.
7th. I claim one or more tortuous pipes connected together in an
inclined position in the space between the bridge wall and the boiler,.
substantially as and for the purposes herein set forth.
8th. The combination of the boiler A and the pipes E, E, connecting
said boiler with the inclined pipe or pipes running back and forth in the
space between the bridge wall and the boiler, substantially as and for
the purposes herein set forth.
In testimony that I claim the foregoing, I have hereunto set my
hand and seal, this Sixteenth day of September, in the year of
our Lord One thousand eight hundred and sixty-nine, at Wash-
ington, in the District of Columbia, United States of America.
Witnesses,
WILLIAM HENRY MASON.
JAMES MADISON MASON.
NOAH SHAW. (L.S.)