Improvements in Furnace Grates.
Year: 1895

page_text: Date of Application, 8th June, 1895
Complete Specification Left, 9th Dec., 1895-Accepted, 18th Jan.. 1896
Improvements in Furnace Grates.
I, CHARLES THOMAS COE, of 611 East 83rd Street, in the City, County and
State of New York, United States of America, Engineer, do hereby declare the
nature of this invention to be as follows:-
:―
My invention relates to furnace grates, and has for its object to provide a grate
adapted to burn equally well and uniformly all grades and sizes of coal, without
loss of fuel through the air passages when burning smaller sizes, such as buckwheat,
culm and screenings, said grate also being constructed with a view to durability
and freedom from warping, as well as the easy interchange of parts when
burned out.
The said grate consists of a rectangular frame of cast iron having substantially
parallel sides and ends, and adapted, as usual, to be supported at opposite ends by
bearers located in the furnace, and in this frame is located a number of removable
grate bar sections, each provided with four or more lugs for supporting the same in
the frame, which latter is for this purpose provided with suitable sockets receiving
the lugs. Play is permitted between the frame and lugs to allow for expansion.
Each section is composed of a central rib and parallel arms projecting at right
angles from said rib, and between said arms are the main transverse air passages.
transversely tapered as usual. Auxiliary lateral air channels are formed in the
arms and preferably enlarged or spread downwardly to obtain a natural flow.
These channels materially increase the area for the admission of air to the grate
and reduce the surface of the grate, while at the same time the increased area for
admission of air does not involve any appreciable increase in loss of fuel by
dropping through the grate. As further important advantages of this construction
may be set forth that there are no narrow projecting parts which interfere with the
raking of the fires, and the arms of the grate are not liable to become distorted..
A set of channels is placed quite close to the transverse ribs as well as to the lugs.
and in general wherever the nature of the sections, requires additional area for the
admission of air. The ends and sides of the sections are set apart from each other
and from the frame to form air passages.
In view of the sectional character of the grate bar, burnt out sections can be
removed and replaced with little trouble and at much less expense than by
replacing an entire har.
By the use of the lateral channels judiciously located, the fuel is uniformly
burned.
For dumping grates the grate bar and sections may be made integral or the
sections are so secured that they cannot become displaced when the grate is
dumped.
Dated this 8th day of June 1895.
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.

page_text: Improvements in Furnace Grates.
I, CHARLES THOMAS COE, Engineer, residing at 611 East 83rd Street, in the
City County and State of New York, in the United States of America, 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 relates to furnace grates, and has for its object to provide a grate
adapted to burn equally well and uniformly all grades and sizes of coal, without
loss of fuel through the air passages when burning smaller sizes, such as buckwheat,
culm and screenings; said grate also being constructed with a view to durability
and freedom from warping, as well as the easy interchange of parts when
burned out.
With this object in view my invention consists essentially in a grate bar composed
of a frame and a series of removable sections each constructed with a series of
arms, intermediate air passages extending in the direction of the length of the
grate bar or section, and short air channels extending transversely into the arms
and opening laterally into the air passages. My invention further provides for a
peculiar dumping frame adapted to hold the grate sections; the same being cast in
one piece and very strong and durable.
I will now describe my said invention in connection with the annexed sheet of
drawings, in which:
Fig. represents partly an elevation and partly a section of a grate-bar
embodying my invention, the section being taken on the line 1. 1 of Fig. 2.
Fig. 2, is a top view thereof.
Fig. 3 is a vertical section on the line 3. 3, Fig. 2.
Fig. 4 is a perspective view of a grate-bar section.
Fig. 5 shows a plan view of a modified form for the grate section.
Fig. 6 is a plan view of a dumping frame adapted for the grate section shown.
Fig. 7 is a side view of the same.
Similar letters of reference designate corresponding parts throughout the several
views of the drawings.
Referring to the drawings, the letter A designates a rectangular frame of cast
iron having substantially parallel sides and ends, and adapted, as usual, to be
supported at opposite ends by bearers located in the furnace.
In this frame is located a number of removable grate-bar sections B, each
provided with four, or more, lugs a for supporting the same in the frame A, which
latter is for this purpose provided with suitable sockets receiving the lugs a.
Play is permitted between the frame and lugs to allow for expansion.
Each section comprises a central rib c as shown in Figures 1 to 4, or two parallel
ribs, as shown in Fig. 5, and parallel arms d projecting at right angles from said
rib. Between said arms are the main longitudinal air passages e transversely
tapered as usual. fare auxiliary lateral air channels formed in the arms and
preferably enlarged or spread downwardly to obtain a natural flow. These channels
materially increase the area for the admission of air to the grate and reduce the
surface of the grate, while at the same time the increased area for admission of air
does not involve any appreciable increase in loss of fuel by dropping through the
grate. Further important advantages of this construction are that there are no
narrow projecting parts which interfere with the raking of the fires, and the arms
of the grates are not liable to become distorted. A set of channels is placed
quite close to the transverse ribs c as well as to the lugs a and, in general, wherever
the nature of the sections requires additional area for the admission of air. The

page_text: ends and sides of the sections B are set apart from each other and from the
frame A to form air passages e¹.
In view of the sectional character of the grate-bar, burnt out sections can be
removed and replaced with little trouble, and at much less expense than by replacing-
an entire bar.
By the use of the lateral channels, judiciously located, the fuel is uniformly
burned.
In Fig. 5 I have shown the grate section provided with two parallel ribs c. c.
located a short distance from the ends. This form can be cast considerably lighter
than the other, and is especially adapted for dumping grates.
In Figures 6 and 7, I have shown a dumping frame adapted to receive and hold
the sections. The same is provided with spaced sockets b, as before, in its
longitudinal members for the reception of the lugs on the sections and with recessed
ends to obtain air spaces between adjoining ends of the frames. At its centre,.
the frame is provided with a transverse resting socket s adapted to be received by
the rocker bar. Near opposite ends of the frame, transverse braces t. t are formed
for strengthening the same. The resting sockets extends entirely across the frame.
and strengthens and braces the same at the middle. By this construction I am
enabled to cast an integral frame of sufficient strength, thus dispensing with the
necessity of sectional frames.
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:-
1. The combination with a supporting frame provided with sockets, of grate
sections consisting of transverse ribs, spaced arms extending transversely therefrom,
and lugs a extending laterally from the outside arms and adapted to be received
by the sockets in the frame for the support of said sections substantially as
described.
.
2. A grate section embodying in its construction a transverse rib, or ribs,
arms formed integral with said rib, or ribs, intermediate air passages extending in
the direction of the length of the grate section, and short air channels extending
transversely into the arms and opening laterally into the said air passages; said air
channels facing, in each instance, the unbroken surface of the opposite arm,
substantially as described.
3. A dumping frame consisting of a rectangular structure provided with spaced
sockets in its longitudinal members, a central resting socket, and transverse braces.
near its ends, substantially as described.
4. A dumping frame consisting of a rectangular structure provided with spaced
sockets in its longitudinal members, a central resting socket, transverse braces near
ts ends, and recessed ends, substantially as described.
Dated December 9th 100%
HARRIS & MILLS,
23 Southampton Buildings, W.C., Agents.
HARRIS & MILLS,
23 Southampton Buildings, W.C., Agents.