Improvements in Compound Fire-grates.
Year: 1891

page_text: Date of Application, 10th Aug., 1891
Complete Specification Left, 10th May, 1892-Accepted, 6th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Compound Fire-grates.
We, GIOVANNI PETERS and STEFANO DE LUCCHI, trading under the name of
Peters and Company, of Rue St. Luca 3b, Genoa, Italy, Engineers, do hereby
declare the nature of this invention to be as follows: :-
The objects of this invention are to uniformly distribute the atmospheric air in
the furnaces of steam generators, to ensure a complete combustion of the fuel
which is placed on the fire-grate, and consequently to obtain an important economy
in the consumption of the fuel. The fire-grate constituting this invention has the
above advantages on account of its general arrangement and its particular form of
construction.
The following is a description of the construction :-A plate of iron or other
metal or substance O (Figs. 1 and 2) bent into the form of a V on its longitudinal
axis is introduced into the ash-pit (Figs. 1 and 2); on this plate are arranged the
fire-bars R, transversely to the axis of the furnace. The fire-bars are composed of
two pieces T, S, (Fig. 4); the piece S is cut at the top part into several sections G,
of which the area is equal to the free space between one bar and another; the same
piece S carries at its outside extremities two pieces K which serve to determine the
above named free space which exists between one bar and another, as well as a
piece, M at its centre, which resting upon the following bar prevents the piece S
from getting out of shape by the action of the heat. The same piece $ on its
inner side carries three pieces J, I, J, which serve to keep detached from one
another the two pieces which compose the fire-bar for a distance J', the extent of
which varies according to the conicity desired to be given to the fire-bars, which
depends on the quality of the fuel employed. The holes or toothed sections G
may be made on one of the pieces which compose the fire-bar S, T, or on each of
the pieces, according to requirement. The piece T carries at its top part a piece Z
which determines the thickness of the fire-bar. Beneath this piece Z and on its
inner side there are two or several fillets N which serve as supports to the piece. S.
The pieces T, S, united together compose the fire-bar proper having in its interior
a chamber V open on both sides and at the bottom and closed at the top part on
which the fuel is arranged. Besides, the piece S of the fire-bar is longer and lower
than the part T thus forming to the fire-bar the small side wings and the under
part L (Fig. 3). In the case where the fire-grate is to be applied to generators
with defective draught, or if it is desired that the fire-bars should be more open,
the piece T of the fire-bar may be supplied in its top piece Z with conical cuts H
(Figs. 3 and 5) formed transversely to the fire-bar and alternately in adjoining bars
as shown in Fig. 5. These cuts instead of being conical may be of any other form,
oblique, round, oval, etc.; or also in the case where the conical cuts H are made,
the toothed cuts or holes G may be done away with. The fire-bars may be
arranged in the fire-box, or directed towards the fire-bridge, or in a contrary
direction, or in any other direction whatever, longitudinal, oblique or in any line on
the plan of the fire-grate.
The above described fire-bars may be employed without the plate O.
The forin and the dimensions of the fire-bars may be modified according to the
different types of generators, the conditions of installation and according to the
quality of the fuel employed.
The fire-bars may be made of cast iron (either ordinary or special). wrought
iron, steel or of any other suitable metal.
The following is a description of the working of the fire-grate :-
The atmospheric air arriving by the passages P, P1, P, formed by the plate O

page_text: on which rest the fire-bars R is introduced into the chamber V of the said fire-bars,
and by means of the holes G is put into communication with the fuel on the fire-
grate.
The area of the sections P, P', P" being equal to the area of the empty spaces,
the atmospheric air is distributed uniformly on the surface of the fire-grate.
Dated this 10th day of August 1891.
ALLISON BROS.,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Compound Fire-grates.
We, GIOVANNI PETERS and STEFANO DE LUCCHI, trading under the name of
Peters and Company, of Rue St. Luca 3, Genoa, Italy, Engineers, 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 :-
The objects of this invention are to uniformly distribute the atmospheric air in
the furnaces of steam generators, to ensure a complete combustion of the fuel which
is placed on the fire-grate, and consequently to obtain an important economy in the
consumption of the fuel.
The fire-grate constituting this invention on account of its general arrangement
and the particular construction, especially of the fire-bars, produces the advantages
above mentioned, by reason of the uniform distribution of atmospheric air over the
whole surface of the grate.
In the accompanying drawings
Fig. 1 is a transverse section of a fire-box provided with the improved grate.
Fig. 2. is a longitudinal section of same.
Fig. 3 an elevation of the fire-bar.
Fig. 4 a transverse section of same.
Fig. 4 another section on line a, b, Fig. 3, and
Fig. 5 a plan view of the top of the bar.
The following is a description of the arrangement of the grate :
A plate of iron or other metal or material O (Figs. 1 and 2) bent into the form
of a V on its longitudinal axis is introduced into the ash-pit (Figs. 1 and 2): on
this plate are arranged the fire-bars R, transversely to the axis of the furnace.
The fire-bars are composed of two pieces T, S (Fig. 4): the piece T is toothed at
the top part in several sections G, of which the area is equal to the free space
between one bar and another; the piece S carries at its outside extremities two
pieces K which serve to determine the above named free space which exists
between one bar and another, as well as pieces M, which bearing against the
following bar prevent the piece S from getting out of shape by the action of the
heat. The same piece S on its inner side carries three pieces J, I, J, which serve
to keep detached from one another the two pieces which compose the fire-bar for a
distance J', the extent of which varies according to the oblique spreading desired
to be given to the inner surfaces of the fire-bars, which in its turn depends upon
the quality of the fuel employed. The holes or toothed sections G may be made on
one of the pieces which compose the fire-bar S, T, (see Figs. 1 and 2), or on each
of the pieces, according to requirement. The piece T carries at its top part
pieces which determine the thickness of the fire-bar. Beneath these pieces Z
and on the inner side of piece T there are two or several fillets N which also serve
to prevent the piece S from getting out of shape. The pieces T S, united together,
or the part T alone, constitute the fire-bar proper, open on both sides and at the
bottom and closed at the top part on which the fuel is arranged. Further, the
piece S of the fire-bar is lower than the part T, and carries small wings Lat
the side and beneath (Fig. 3). In the case where the fire-grate is to be applied to

page_text: generators with defective draught, or if it is desired that the fire-bars should be
more open, the piece T of the fire-bar may be provided in its top teeth Z with cuts
through H of conical, triangular, oblique, round, oval or other form, (not shown in
the drawings), formed transversely to the fire-bar and alternately in adjoining bars.
When the cuts are provided, if desired the toothed cuts or holes G may be done
away with. The fire-bars may be arranged in the fire-box with the holes G
directed towards the fire-bridge, or in a contrary direction, or in any other direction
whatever, longitudinal, oblique, or in any line on the plan of the fire-grate.
Further, the part S may be dispensed with, the part T only being retained.
The above described fire-bars may be employed without the plate O.
The form and the dimensions of the fire-bars may be modified according to the
different types of generators, the conditions of installation, and according to the
quality of the fuel employed.
The fire-bars may be made of cast iron (either ordinary or special), wrought
iron, steel, or of any other suitable metal.
The following is a description of the working of the fire-grate :-
:-
The atmospheric air arriving by the passages P, P1, P", formed by the plate O
on which rest the fire-bars R, is introduced into the chambers V of the said fire-
bars, and by means of the holes G is put into communication with the fuel on the
fire-grate.
When plate O is employed the total area of the sections P, P₁, P", being equal
to the area of all the empty spaces which are left between the bars of the grate,
the atmospheric air is distributed uniformly over the surface of such grate.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
The improved arrangement of grate with compound fire-bars constructed as
described, for the purpose of distributing atmospheric air uniformly to the fire-box
of steam generators.
Dated this 10th day of Nov 180D
ALLISON BROS.,
Agents for the Applicants.