Improvements in Grate Bars for Garbage Cremating Furnaces.
Year: 1895

page_text: Dite of Application, 25th Apr., 1895-Accepted; 8th June, 1895
COMT LEIN SPECIFICATION
[Communicated from abroad by AMERICAN GARBAGE CREMATOR Co., of
45, Oliver Street, Boston, Massachusetts, United States of America.]
Improvements in Grate Bars for Garbage Cremating Furnaces.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 in grate-bars for garbage cremation
furnaces.
In furnaces for the cremation of garbage where material is supported on grate-
bars during the progress of its consumption, the great heat in the furnace weakens
the grate-bars, and by reason of the weight of material carried by said bars, they
are liable to bend and sag. The bars also burn out rapidly, requiring their
removal at short intervals. In such furnaces and especially those in which the
flame passes under the grates for the combustion of the garbage or both over and
under such grate, the shape of the grate-bar is of great importance. In furnaces
having the ordinary form of grate-bars, the material to be burned is liable to arch
over from one bar to another in such way that the main body of the material is
supported above and upon the arches above the top of the bars so that the flame
underneath the bars cannot reach the material and the bars become highly heated
on the underside.
The object of my invention is to overcome the difficulties and disadvantages
above noted, and to this end my invention consists of a grate-bar triangular in
cross-section, the apex of which is a sharp point.
The invention is clearly illustrated in the accompanying drawings, in which-
Fig. 1 is a transverse section of a furnace, showing my new grate-bar in elevation
in its position for use;
Fig. 2 is a top plan view of a row of the bars in position, and
Fig. 3 is a longitudinal section of a furnace, part being broken away.
A is a furnace having return flues beneath the grate and B is a grate-bar. The
grate-bars are by preference about ten inches high, about three and a-half inches
broad at the base, of suitable length, say, about eight feet, and arranged about
one and three-fourths of an inch apart at their base. I make them triangular in
cross-section, with a sharp edge, and prefer to cast them of iron with an excess of
silicon in it, to stand great heat. When made in this form with the sharp edge
upward, the formation and maintenance of arches from bar to bar is prevented.
The sharp edges of the bars tend to cut and separate the material above them, and
as the heat from the bars and the furnace dries the body between said bars, it
contracts and constantly settles through between the base of the bars and comes in
range of the flame and is consumed. In this way the combustion of the underside
of the material progresses while the grate-bars are kept relatively cool by the
material constantly moving down their inclined sides. At intervals along the
length of the bars I provide lugs b b for keeping the bars separated and preventing
crowding of the same.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I'declare that what I claim is:
=
A grate-bar for return flue cremation furnaces, triangular in cross-section and of
equal cross-section throughout its whole length, its upper sides or faces forming an
acute angle with one another and meeting in a sharp cutting edge, substantially
as and for the purpose described.
Dated un18 20th.uay of expr
HASELTINE, LAKE & Co.,
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45, Southampton Buildings, London, W.C., Agents for the Applicant.