Year: 1886

page_text: Date of Application, 23rd Nov., 1886.
Complete Left, 22nd Aug., 1887.
Complete Accepted, 27th Sept., 1887
I, GEORGES ALEXIS GODILLOT, of 50 rue d'Anjou, Paris, in the Republic of
France, Engineer, do hereby declare the nature of this invention to be as follows :-
This invention relates to the construction and arrangement of revolving fire grates
for furnaces in such a manner as to facilitate stoking and to prevent the burning of
the metal or formation of clinkers. A fire grate according to this invention consists
of a number of elements, a central one which is circular and others of annular form
concentrically surrounding it, each consisting of radial alternate ribs and spaces.
These elements may be arranged all in one plane, or in steps one above or below the
next, so as to give the fire place a concave or a convex conical or conoidal contour.
All the elements may be caused to revolve together, or only the alternate elements,
this latter arrangement being preferred for giving movement to the fuel on the several
grate elements and detaching clinkers therefrom. When the elements are arranged
in conical or conoidal form, highest at the centre the fuel may be fed continuously
from a hopper or shoot above the axis on to the uppermost element, from which it can
drop on to and over the successive elements below. The vertical axis of the grate
may be mounted at or near the front of the fire place, so that a portion of the grate
revolves outside the fire place, presenting itself externally to receive fuel and to be
cleared of ash or clinkers. When this arrangement is adopted, the fuel may be
continuously fed from a hopper or shoot on that part of the grate which in the course
of its revolution is entering the fire place, the charge of fuel being regulated by the
height of the aperture in the front of the fire place. When it is desired to have all
the elements equal and similar and yet to form a stepped grate, each is made annular,
and mounted on a separate vertical axis, the axis of the lowest element farthest in
advance and the axis of the others farther and farther back as they ascend. In order
more effectually to distribute the fuel over the successive elements and clear them of
clinkers, those of them that revolve may be mounted eccentrically, or, instead of
having a circular outline they may have an elliptical or undulating outline, so that
parts of their circumferences as they revolve have a to and fro movement as well as a
movement of rotation, over and under the stationary elements.
Dated this 23rd day of November 1886.
ABEL & IMRAY,
28, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: I, GEORGES ALEXIS GODILLOT of 50 rue d'Anjou, Paris, in the Republic of France,
Engineer, 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 the construction and arrangement of revolving fire grates
for furnaces in such a manner as to facilitate stoking and to prevent the burning of the
metal or formation of clinkers. A fire grate according to this invention consists of a
number of elements, a central one which is circular and others of annular form
concentrically surrounding it each consisting of radial alternate ribs and spaces.
These elements may be arranged all in one plane or in steps one above or below the
next, so as to give the fire place a concave or a convex conical or conoidal contour. All
the elements may be caused to revolve together, or only the alternate elements, this
. latter arrangement being preferred for giving movement to the fuel on the several
grate elements and detaching clinkers therefrom. When the elements are arranged in
conical or conoidal form, highest at the centre, the fuel may be fed continuously from
a hopper or shoot above the axis on to the uppermost element, from which it can drop
on to and over the successive elements below.
The vertical axis of the grate may be mounted at or near the front of the fire place,
so that a portion of the grate revolves outside the fire-place, presenting itself externally
to receive fuel and to be cleared of ash or clinkers. When this arrangement is adopted,
the fuel may be continuously fed from a hopper or shoot on that part of the grate
which in the course of its revolution is entering the fire place, the charge of fuel being
regulated by the height of the aperture in the front of the fire place. When it is
desired to have all the elements equal and similar and yet to form a stepped grate, each
is made annular and mounted on a separate vertical axis, the axis of the lowest element
farthest in advance and the axis of the others farther and farther back as they ascend.
In order more effectually to distribute the fuel over the successive elements and clear
them of clinkers, these of them that revolve may be mounted eccentrically, or instead
of having a circular outline, they may have an elliptical or undulating outline, so that
parts of their circumferences as they revolve have a to and fro movement as well as a
movement of rotation, over and under the stationary elements.
Figs. 1 to 8 of the accompanying drawings shew various forms in outline which
furnace grates constructed according to my invention may be made to assume.
The bars are made of a section and at a distance apart suitable for the particular
description of fuel to be burnt on the same.
Fig. 9 shews a section of a flush grate the circular elements A of which are each
formed with fine bars a a.
Fig. 10 and 11 shew a section and plan of a grate with angular raised surfaces the
circular elements forming the same having radial openings. Each element is mounted
in a similar manner to a turntable so as to allow of its ready rotation, this movement

page_text: may either be continuous or step by step in one and the same direction, or it may be a
reciprocating motion, and the several elements may either revolve in the same direction
at different speeds, or they may revolve in contrary directions.
When the grate is formed with an incline it may be of advantage to make one
element revolve slightly excentrically to the contiguous ones, by this means a displace-
ment of the elements relatively to each other will be effected whereby the fuel will be
pushed downwards somewhat, thus facilitating its downward feed. The elements may
also have a slight vertical motion imparted to them, whereby the breaking up of
clinkers &c. will be facilitated. The necessary motion may be imparted to the elements
either mechanically or by hand.
The axis of rotation may be situated at the centre of the furnace as shewn at
Figs. 12 and 13, and the entire furnace chamber be made circular or the chamber may
be made partly or wholly rectangular as at m m Fig. 14, the fire grate being made
with fixed corner pieces at those joints.
Fig. 15 shews a furnace with a dished fire grate composed of rotating elements.
Fig. 16 shews a raised or convex arrangement of the grate. When the convexity is
considerable so as to be of a conical or "pavillion" form the fuel is introduced above
the centre whence it spreads itself equally over the whole surface; this arrangement
also admits of the ready use of a mechanical feed apparatus.
The "pavillion" grate may be placed above a horizontal one as shewn at B Fig. 17
or above a solid bed as shewn at Ċ Fig. 18. In these two figures D D are openings
for clearing out the furnace.
The entire grate may be of a single revolving piece, in which case the advantage of
breaking up the clinkers by the motion is not obtained but this arrangement affords
facilities for cleansing, as the fireman can with ease clear that part of the grate from
clinkers which presents itself for the time being in front of the furnace door, and can
then supply that section with fresh fuel, after which the grate is turned partly round
so as to bring another section in front.
In the case of a rotating pavillion grate of a single piece, facility for inspection is
afforded by having a sight hole in front of which each part of the grate appears in
succession.
Figs. 19, 20, 21 and 22 shew arrangements suitable for fuel that should be burnt in
a thick layer, in these arrangements E E are openings through which the grate can be
cleansed, closed by doors F.
Instead of arranging the axis on which the fire-grate rotates in the centre of the
furnace it may be arranged excentrically thereto; thus it may be situated quite to one
side, against the wall of the furnace, so that a part of the grate in rotating projects
entirely outside the furnace, and can thus be examined and cleansed with ease and
allowed to cool down. Figs. 23 and 24 shew in section and plan an arrangement of
this kind, with a horizontal circular grate. In this case, assuming every alternate annular
element of the grate to rotate in one and the same direction while the others revolve
in the contrary direction, the fuel will be fed in through the door G at the centre, and
owing to the relative motion of the elements the fuel will be soon automatically spread
over the whole surface of the grate. The doors H H give access for cleansing. If
the elements of the grate were all made to revolve in the same direction at different
speeds or if the entire grate be made of one piece, the feeding in of the fuel would
have to be effected through a door H on one side, as at Fig. 25 while the
clinkers &c. are removed at a door H' on the opposite side. Instead of feeding the
fuel in periodically through the door H it is preferable to make the opening at H
the entire width of the one side of the fire grate, and of a height equal to the thickness
of the layer of fuel required, in which case the fireman would merely heap the fuel
continuously on the grate in front of the opening H, and the grate in carrying the
fuel through the opening would cause it to be equally spread over the grate. With
this arrangement the stoking might be effected automatically by feeding the fuel
through a hopper on to the part of the grate outside the opening, the hopper being
kept full by any suitable known means.
For effecting a perfect mixture and combustion of the gases generated, the opening

page_text: leading to the chimney should be situated on the side of the furnace opposite to the
opening H; so that the gases generated at that point have to travel over the whole of
the incandescent fuel on the other part of the grate, and become mixed with the gases
there generated, before issuing through the outlet.
With the above described arrangement of the grate, this may be made annular
instead of a complete circular disc as shewn at Figs. 26 and 27. Fig. 28 shews an
elevation Fig. 29 a section on line M N Fig. 30 a sectional plan on line P Q and
Fig. 31 a section on line R S of a pavillion shaped revolving grate placed over a solid
fixed bed, the axis of rotation being against the one side of the furnace.
Below the bed is an ash pit for receiving the ashes &c. The wall of the furnace
through which the grate works has a cast iron framing following the configuration of
the grate so as to form a joint therewith and made in parts so that it can be readily
removed and replaced when burnt. The rotation of the grate may be made to effect
automatically the removal of the ashes &c.
Figs. 32 and 33 shew an elevation and plan of a pavillion grate revolving over a
horizontal bed in which the lowest bar K is provided with an arm d which passes down
on to the bed and in revolving scrapes away the cinders on the edge of the bed causing
them to fall into the ashpit. When the ashpit is external as shewn at Figs. 34 and 35
the arm or scraper is so formed as to push the cinders outwards.
In the above described arrangements the diameters of the circular elements are made
gradually diminishing; Fig. 36 shews an arrangement in which the circular elements
are all made of the same diameter, thus forming in section a kind of ladder of circular
elements each of which revolves on a different axis. The lowest element I may be
situated over a horizontal bed J or the lowest element may be made of larger diameter,
as at Figs. 37 and 38.
These fire grates may be fed automatically, either delivering the fuel by a screw as
at Fig. 36 delivering on to the inner part of the grate, or it may be delivered through
a shoot O on to the outer part of circular plate covering the top element of the grate,
and which carries it into the furnace.
The quantity of fuel admitted may be regulated by a slide P.
Instead of imparting rotation to all the elements, they may be connected together
in pairs, as shewn at Fig. 39, the element g h being in that case concentric with the
element which supports it.
The above described revolving grates instead of revolving upon a vertical axis may
have their axis slightly inclined.
If, as before described, the alternate elements are mounted on excentric axes, there
will be produced a horizontal advance of the one element upon the other during one
half of a revolution, and a recession during the other half. Such a relative horizontal
motion of the elements may also be obtained in other ways thus instead of making the
elements circular they may be of elliptic configuration as shewn at Fig. 40 in which
case one complete revolution will afford two advances and two recessions; or again, the
elements may be made with an undulating configuration as at Fig. 41 in which case
there will be as many advances and recessions as there are undulations.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed I declare that what I claim is :-
Constructing revolving fire grates substantially as herein described whereby stoking
is facilitated and the formation of clinkers and the burning of the metal is prevented.
100M
ABEL & IMRAY,
Agents for the Applicant.