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Патент USA US2111438

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March 15, 1938.
2,111,438
l. C. SMITH
GRATE
Filed April 20, 1937
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2 Sheets-Sheet 1
March‘ 15? 1938.
_
,_ c, SM‘TH
2,111,438
GRATE
Filéd April 20, 1937
2 Sheets-Sheet 2
Patented Mar. 15, 1938
2,111,438
UNITED SATES PATENT OFFICEf'”
_ Ira C‘. Smith, Scranton, Pa.
Application April 20, 1937, Serial No. 138,045
6 Claims. (Cl. 126-176)
This invention relates to furnace grates gener
ally; and particularly to oscillatory grates adapt
ed'for use with automatic stoker mechanism.
The main object of the invention is to provide
5 a mounting for a grate of the type disclosed in
my United States application Serial No. 95,463,
?led August 11, 1936, and allowed January 4,
‘1937; and in which the grate is normally inclined
ably in a U-shaped bracket 19, suitably secured
to the side wall 20 of the furnace 9.
.
The other end of the shaft 18 projects through
the side bar 15 of the grate and through an aper
ture 2! formed in the side wall 22 of the furnace, J45
the aperture 2! forming a journal bearing for
the shaft 18. A series of shafts 23 are journaled
parallel to each other and to the shaft l8 in
"to the horizontal in such manner as to provide slots’ 24 formed in the side bars l4 and I5. One
‘ 1:0. for the automatic feed and even distribution of end of each shaft 23 is reduced to form a shoul- e10
coalfrom a magazine arranged at the upper end 'der 25, seating against the inside of the side bar
M. The reduced end 26 ?ts within the slot 24,
thereof.
,
A further object of the invention is to provide and is locked rotatably in the said slot 24 by
means of a locking bar 21, provided with a series
a grate of the character described with mecha
‘ l5 nism for oscillating the grate as a Whole about of slots 28, ?tting over the reduced ends 26 of 51.15
its lower end,‘ while at the same time rotating the shafts 23. The rear end of the locking bar
the bars of the grate to cut from the ?re bed 21 is apertured to ?t the shaft I8, about which
the ashes and debris which ordinarily interfere it may be rotated into and out of locking posi
tion with respect to the reduced ends 26 ‘of the
with the emcient operation of the furnace.
'
shafts 23. When the locking bar 21 is in locking;J20
Other objects of the invention will become ap
parent as the detailed description thereof pro- 7 position, it may be secured in such position by'
means of the screws 29.
ceeds.
In the drawings:
Figure 1 is a fragmentary vertical section
through a furnace provided with a grate of the
‘character described and arrangedrin’the furnace
to receive coal from a magazine feed chamber; ‘
FigureZ is a section taken on the line 2-2 of
Figure 1;
i
>
.
Figure 3 is a vertical section taken on the line
3—-3 of Figure 2;
Figures 4, 5, 6, and 7 are longitudinal sections
7 of the grate illustrating the positions of the grate
with respect to the magazine during a complete
oscillatory movement about its lower axis;
Figure 8 is a section taken on the line 8-8 of
Figure 4; and
Figure 9 ‘is a section on the line 9-9 of Fig
ure 1.
113m
Referring to the drawings, in which similar
‘parts are designated by like numerals:
The'refe'rence numeral 9 designates‘a furnace
provided with a fuel magazine It, and a combus
tion furnace chamber H. The magazine H] is
‘45 provided with the bottom wall 12, inclined down
wardly toward the combustion chamber 5 i to feed
‘ fuel by gravity onto the grate designated gener
allyv by the reference numeral 13.
The grate 13 comprises a frame having side
i 50 bars 14 and I5 connected at one end by a cross
bar IS, and near their other ends by a cross bar
l'l. The side bars 14 and E5 project beyond the
1 cross bar 11; and their projecting ends have a
shaft 18, journaled therein. One end of the shaft
5
Ur 48 projects through the side bar 14 to seat rotat
'
1
A locking bar 39 similar in every respect to
the locking bar 2'5 is rotatably mounted "on ‘the
other end of ‘the shaft l8 and is adapted to be .25
similarly secured in looking rotation to the side‘
“ bar [5 by means of the screws 3|. The shafts'23
project through arcuate slots 32 formed in the
side wall 22 to provide for a somewhat limited
oscillation of the grate l3 as a whole about the5‘30
axis of shaft IS.
The free end of the grate is ’ '
supported, by means of a pair of cams 33 ?xed
to the outer shaft 23 and resting upon brackets
34, suitably secured to the side walls 20 and‘ 22
of the furnace.
35
The parallel shafts 23 are each provided with" ’
a series of spaced apart ?re-supporting members
35, the members on one shaft being staggered
with respect to those on the adjacent shaft or
shafts. The shaft 58 has secured thereto a pairing)
of sprockets 35 and 31, and a crank handle 38.’
The sprockets 36 and 31 are operatively con
nected by means of sprocket chains 38' and 39
to sprockets ?xed to the ends of the parallel
shafts 23; so as to rotate all of said shafts simul» 45
taneously and in the same direction.
;
'
It will be obvious from inspection of the draw
ings and when the shaft 18 is rotated-by means
of the crank 38 all the shafts 23 and theme
supporting members arranged thereon will be 50
simultaneously rotating to effect a cutting opera-1 ‘
tion on the ashes or lower layer of the super
posed fire bed. During the rotation of the shaft
23 the cams 33 will also be rotated, and by con
tact with their supporting bracketv34 will causegi55 -
2
2,111,438
the free end of the grate l3 to swing toward and
from the downwardly inclined bottom wall l2 of
the magazine In.
ranged in staggered relation with respect to the
The cross bar It is provided with a series of
simultaneously rotating said shafts and for oscil
lating said grate to cause the free end thereof to
reciprocate with respect to said magazine.
2. A furnace comprising a casing partitioned
lugs 40 adapted to receive tongues 4| which pro
ject downwardly from a cut-off bar 42 detach
ably mounted on the upper edge of the bar l6
and shaped to swing across and close to the end
of the bottom plate l2 of the magazine It]. The
10 oscillatory movements of the grate l3 about its
pivot shaft I8, is illustrated in Figures 4, 5, 6,
?re supporting members on adjacent shafts, and
cooperating means on said casing and grate for
to form a furnace chamber and a magazine for
fuel, a grate comprising a substantially rectangu
lar frame pivoted at one end of said chamber, a 10
plurality of shafts journaled parallel to each
and 7 of the drawings. Figure 4 shows the nor
other in said frame, fire supporting members
mal raised position of the grate I 3. When the
shafts 23 are rotated anti-clockwise, as shown in
spaced apart along each of said shafts and ar~
ranged in staggered relation with respect to the
15 the drawings, the grate drops from the normal
position shown in Figure 4 to the lowered posi
tion shown in Figure 5. This preliminary move
ment serves to break the crust formed by the
?re bed. Continued anti-clockwise rotation of
20 the shafts 23 moves the grate from the position
shown in Figure 5 to that shown in Figure 6 in
which the scoop-like ?ngers of the ?re support
‘ing members 35 are in vertical position.
It will be noted that the upper end of the cut
off bar 42 projects above the downwardly inclined
bottom wall E2 of the magazine, when the grate
is positioned as shown in Figure 6. The cams 33
are substantially circular between the radii 43
and 44 so that further anti-clockwise rotation of
~30 the cams through an angle of about 90°, will pro
duce very little movement of the grate section 35
with respect to the bottom plate E2 of the maga
zine. Further anti-clockwise movement from the
position shown in Figure 6, through that shown
'in Figure 7, to its normal position shown in Fig
ure 4, merely effects a slight rocking movement
which facilitates the scooping action of the mem
bers 35 on the ashes constituting the lower part
)of the ?re bed.
It will be evident from inspection of Figures
'40
4 to '7, inclusive, that rotation of the pivot shaft
l8 not only causes rotation of all the shafts 23,
with their ?re supporting members 35, but also
causes a decided drop‘ from the position shown in
Figure 4 to that shown in Figure 5, to cause a
break in the superposed ?re bed. This break, ac
companied by continued rotation of the ?re sup
porting members 35 insures an effective removal
of the ashes from the ?re bed, and a dropping
thereof into the ash pit.
The staggered relation of the ?re-supporting
members 35 on each shaft with respect, to the
positioning of these members on adjacent shafts
enhances the draft through the ?re-bed, and in
55 creases the e?iciency of ash removal from the
?re bed. The bar 42 at the upper end of the grate
is also provided with apertures 45 which serve as
draft apertures for the ?re bed and also as pas
sageways for ashes which may be shaken from
the ?re bed by the oscillation of the grate as a
50
whole.
,
Numerous variations may doubtless be devised
by persons skilled in the art without departing
from the principles of my invention. 1, there
65 fore, desire no limitations to be imposed on my
invention, except such as are indicated in the
appended claims.
What I claim is:
1. A furnace comprising a casing partitioned
?re supporting members on adjacent shafts, sup 15
ports on the opposite side walls of said chamber
for the free end of said grate, cams secured to
the shaft nearest said free end and resting upon
said supports, and means on said casing and
shafts for simultaneously rotating said shafts 20
and for oscillating the free end of said grate with
respect to said magazine.
3. A furnace comprising a casing partitioned to
form a furnace chamber and a magazine for fuel,
a grate having a substantially rectangular frame 25
pivoted at one end to the opposite side Walls of
said chamber, a plurality of shafts journaled
parallel to each other in said frame, ?re sup
porting members spaced apart along each of said
shafts, means for supporting the free end of said 30
grate to maintain the grate normally inclined to
the horizontal, said magazine having a bottom
wall inclined to the horizontal and projecting
into said furnace chamber, and cooperating
means on said casing and said shafts for simul ,35
taneously rotating said shafts and for causing the
free end of said grate to swing past the pro
jecting end wall of said magazine.
4. A furnace comprising a casing partitioned
to form‘ a furnace chamber and a magazine for 40
fuel, a grate having a substantially rectangular
frame pivoted at one end to the opposite side
walls of said chamber, a plurality of shafts jour
naled parallel to each other in said frame, ?re
supporting members spaced apart along each of
said shafts, means for supporting the free end
of said grate to maintain the grate normally in
clined to the horizontal and projecting into said
furnace chamber, said magazine having a bottom
wall inclined to the horizontal and projecting
into said furnace chamber adjacent the free end
of said frame, a cutting section detachably con
nected to the free end of said frame and adapted
to swing with said frame with respect to the pro
jecting end of said bottom wall, and means con
nected to said casing and shafts for simultane
ously rotating all of said shafts and for oscillat
ing the free end of said frame to swing said cut
ting section toward and from the projecting end
of said bottom wall.
5. A furnace comprising a casing partitioned
45
50
55
60
to form a furnace chamber and a magazine for
fuel, a grate having a substantially rectangular
frame pivoted at one of its ends in said chamber,
said magazine having a bottom wall inclined to 65
the horizontal and projecting downwardly into
said furnace chamber, a plurality of shafts jour
naled parallel to each other in said frame and
having ?re supporting members spaced apart
to form a furnace chamber and a magazine for
thereon, and cooperating means on said casing
fuel, a grate comprising a substantially rectangu
and shafts for simultaneously rotating said shafts
lar frame pivoted at one end of said chamber, a
and for oscillating the grates so that its free end
plurality of shafts journaled parallel to each
other in said frame, ?re supporting members
75 spaced apart along each of said shafts and ar
said bottom wall.
6. A furnace comprising a casing partitioned to
swings past the downwardly projecting end of
2,111,438
3
form a furnace chamber and a magazine for fuel,
a grate having a substantially rectangular frame
pivoted at one of its ends in said chamber, said
magazine having a bottom wall inclined to the
posite side walls of said chamber, cams ?xed to
one of the shafts remote from the pivoted end,
of said frame and resting upon said brackets, a
horizontal and projecting downwardly into said
furnace chamber, a plurality of shafts jour
naled parallel to each other in said frame and
having ?re supporting members spaced apart
end of said frame and adapted to swing past the
inwardly projecting end of said bottom wall, and
gearing for simultaneously rotating said shafts
thereon, supporting brackets extending from 0p
cutting section projecting upwardly from the free
and cams.
'
IRA 0'. SMITH.
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