Improvements in Furnace Grate-bars.
Year: 1892

page_text: Date of Application, 11th Apr.. 1892-Accepted, 14th May 1992
J
COMPLETE SPECIFICATION.
Improvements in Furnace Grate-bars.
I, WILLIAM HENRY HEESON, residing at 70 River Street in the City of
Toronto, County of York, Province of Ontario, Canada, Engineer, do hereby
declare the nature of my 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 certain new and useful improvements in " rocking-grate-
bars for furnaces," and the object of the invention is to so construct the grate bar
that the largest possible volume of air will be admitted therethrough to the fire, to
facilitate the decomposition of the fuel and to render the combustion as nearly
perfect as possible within the fire box; and the grate-bar consists essentially of
two central longitudinal webs connected together at their ends and intermediately
between the ends, a passage between these central longitudinal webs for the
admission of a draught of air from the under side of the grate bars to the fire; a
series of laterally extending ribs joined or connected to each of the central longi-
tudinal webs at their inner ends and to longitudinal ribs at their outer ends, each
of these laterally extending ribs having one or more steps formed on its upper
face; the side face of the longitudinal rib provided with a series of vertical
corrugations the concave portions of which preferably taper from the bottom to
the top of the longitudinal rib and the convex portions consequently tapering from
the top to the bottom; each of the laterally extending ribs is provided on its under
side with a supporting rib the edge of which is concaved to admit of the free
passage of the air through the spaces between the laterally extending ribs, the
whole device being constructed and arranged as hereinafter more fully set forth
in the Specification and more particularly pointed out in the claims.
In the drawings :-
:―
Figure 1 is a perspective view of a section of a furnace showing three of my
grate bars mounted therein and connected together by a link, the middle bar being
provided with a spindle having a square shoulder to receive the end of the crank
shaker, the two central longitudinal webs connected together at their ends and
intermediately between the ends, the air passage formed between the central
longitudinal webs and the intermediate and the end connecting pieces, the laterally
extending ribs connected at their inner ends to the central longitudinal webs
and at their outer ends to the longitudinal rib, the longitudinal rib corrugated
on its side face and each of the ribs provided with two steps on their upper or
top faces.
Figure 2 is an enlarged perspective view of one of the grate-bars shown in
Figure 1 of the drawings locking at the said grate-bar from the end opposite to
that shown in Figure 1.
Figure 3 is a cross sectional view on the lines a―a Figure 2.
Like numerals of reference refer to like parts throughout the Specification and
drawings.
In the drawings, 1, refers to the walls of the furnace in which are formed suitable
bearings for the spindles 2 of the grate-bars. Each of the grate-bars consists of
two central longitudinal webs 3 extending from the front to the rear of the furnace
and coupled together at each end by means of end pieces 4 and at their middle by
means of an intermediate piece 5.
Between the central longitudinal webs 3 are two passages 6 for the admission of
a draught of air from the under side of the grate-bar centrally through the web to
the fire. It might here be stated that the walls of these passages 6 taper from

page_text: the bottom to the top, that is, the bottom of these passages are larger than the top
for the purpose of giving force to the air admitted therethrough.
A series of laterally extending ribs 7 are connected at their inner end to each of
the central longitudinal webs 3 and are connected at their outer ends to the longi-
tudinal ribs 8. Each of the lateral ribs 7 as shown in the drawings has formed on
its top or upper face two steps 9. Each of the longitudinal ribs 8 has formed on
its side face a series of corrugations, the concaved portions 10 of which taper from
the bottom to the top of the said rib and the convex portions 11 tapering as a
consequence from the top to the bottom.
Extending downwardly from one end of each of the grate bars and parallel to
each other are two lugs 12 separated by a space 13. The lugs 12 of each of the
grate bars are arranged at the same end of the furnace and passing through the
spaces 13, between these lugs 12 is a link 14 pivotally secured to each of the lugs 12
by means of bolts passing through the openings 15 in the lugs 12 and corresponding
openings in the link 14.
The spindle 2 of the middle grate bar is provided with a square shoulder 2" to
which is fitted the cranked shaker. The movement of the middle grate bar causes
a similar and simultaneous movement on the part of each of the remaining grate
bars and the clinkers and ashes are moved toward the opening formed between the
grate bars during the operation of shaking. During the operation of shaking the
steps 9 prevent the return of the clinkers and ashes to their original position in
the event of their meeting an obstruction in their passage into the ash pit through
the opening formed between the grate bars. In the event of the clinkers binding
between the upper face of the lateral ribs 7 and the side face of the longitudinal
ribs & they are firmly held by the steps 9 and ground into small pieces between
the upper face of the lateral ribs 8 and the corrugations on the side face of the
longitudinal ribs 8.
Owing to the peculiar formation of the concaved portions 10 of the corrugations
on the side faces of the longitudinal ribs 8 cinders and clinkers entering the upper
end of the said portions 10 are permitted to drop through into the ash pit 16 without
It will also be
danger of their binding during their passage therethrough.
noticed that to strengthen each of the lateral ribs 7 a supporting rib 17 is formed
on the under side of the said lateral ribs and is connected to the central depending
portion 3 of the longitudmal web 3. It will also be noticed that the edges of the
ribs 17 are cut away in a curved manner to permit of the air passing freely along
the under sides of the ribs 7 and into the fire box through the spaces between the
said lateral ribs 7.
It might also here be stated that owing to the peculiar formation of the side
faces of the longitudinal ribs 8 the air is permitted to pass into the fire box through
the concaved portions 10.
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 improved grate bar herein described and illustrated in the accompanying
drawings.
2) The improved furnace grate bar herein described and illustrated in the accom.
panying drawings and comprised of two central longitudinal webs connected together
at each end and intermediately between the ends, a passage between the central
-longitudinal webs for the admission of a draught of air from the under side of the
grate bars to the fire, a series of laterally extending ribs joined or connected at
their inner ends to each of the central longitudinal webs and their outer ends to
longitudinal ribs each of the laterally extending ribs having one or more steps
formed on its upper face.
3) The improved grate bar described and illustrated in the accompanying
drawings comprised of two central longitudinal webs connected together at their

page_text: ends and intermediately between their ends, a passage between the central longi-
tudinal webs for the admission of a draught of air from the under side of the grate
bars to the fire, a series of laterally extending ribs joined or connected at their
inner ends to each of the central longitudinal webs and at their outer ends to a
longitudinal rib, each of these laterally extending ribs having one or more steps
formed on its upper face, the side face of the longitudinal rib provided with a series
of vertical corrugations the concaved portions of which preferably taper from the
bottom to the top of the longitudinal rib and the convexed portions consequently
tapering from the top to the bottom.
4) The improved grate bar herein described and illustrated in the accompanying
drawings comprised of two central longitudinal webs connected together at their
ends and intermediately between the ends, a passage between the central longi-
tudinal webs for the admission of a draught of air from the under side of the grate
bar to the fire, a series of laterally extending ribs joined or connected at their inner
ends to each of the central longitudinal webs and at their outer ends to a longitudinal
rib, each of these laterally extending ribs having one or more steps formed on its
upper or top face the side face of the longitudinal rib provided with a series of
vertical corrugations the concaved portions of which preferably taper from the
bottom to the top of the longitudinal rib and the convex portions consequently
tapering from the top to the bottom, each of the laterally extending ribs provided
on its under side with a supporting rib the edge of which is concaved.
Dated this 25th day of March 1909
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.