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Патент USA US2109914

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March 1, 1938.
2,109,914
G. VON HAASE
STOKER MECHANISM
Filed NOV. 18, 1935
5 Sheets-Sheet l
562
10
?at I
4
‘I
5 .7 INVENTOR.
IQ“ ‘
ul pl 7;
,4:- 650065 VM/r’m:
H.“
,..,ll .1
ATTORNEY;
March 1, 1938.
G. VON HAASE
2,109,914
STOKER MECHANISM
Filed Nov. 1a,’ 1955,
5 Sheets-Sheet 2
(“q-1
BY
GEO/96E l/a/v MA .55
w, _aééaam $0M
ATTORNEY‘?
March 1, 1938.
s. VON HAASE
2,109,914
STOKER MECHANISM
Filed NOV. 18, 1935
5 Sheets-Sheet 3
INVENTOR.
GEORGE l/a/v HAAsE
m, m {M
ATTORNEYS
March 1, 1938. .
2,109,914
G. VON HAASE
STOKER MECHANISM
Filed Nov. 18, 1955
-
5 Sheets-Sheet 5
INVENTOR‘
BY
ATTORNEYS
-
2,109,914
Patented Mar. 1, 1938
UNITED STATES PATENT OFFICE
2,109,914
STOKER IVIECHANISM
George Von Haase, Lakewood, Ohio, assignor to
The American Ship Building Company, Cleve
land, Ohio, a corporation of New Jersey
Application November 18, 1935, Serial No. 50,251
16 Claims.
This invention relates to improved apparatus
for feeding and burning fuel, and more particu
larly to an improved stoker mechanism having
novel fuel feeding means and novel grate actu
5 ating means.
An object of this invention is to provide im
(Cl. 110-38)
Figs. 6 to 9 inclusive are transverse sectional
views taken through the grate actuating mecha
nism, as indicated by the corresponding section
lines of Fig. 5.
In the accompanying drawings to which more 5
detailed reference will now be made, I have shown
proved apparatus of the type referred to, wherein
improved fuel feeding and grate operating mech
the novel fuel feeding means comprises a rela
anism which is more durable and reliable than
tively inclined feed tube having a correspond
10 ingly inclined reciprocable plate forming the bot
tom thereof.
Another object of this invention is to provide
novel grate actuating mechanism wherein a re
leasable drive connection between one set of grate
15 elements and a power shaft is rendered effective
and ineffective by the action of releasable drive
means between the shaft and another set of grate
elements.
Still another object of the invention is to pro
vide improved grate actuating mechanism where
in means for operating the grate elements in
timed relation includes a member movable into
and out of power transmitting cooperation with
adjacent parts and wherein the movements of
25 such member take place while it is not under
load.
A further object of the invention is to provide
novel grate actuating mechanism embodying
means for operating grate elements in timed re
30 lation including members which are movable into
and out of power transmitting cooperation and
which are provided with a substantially dust
proof casing.
Yet another object of this invention is to pro
vide novel actuating mechanism for sets of grate
elements, comprising an oscillating shaft having
levers connected, respectively, with the sets of
grate elements, and means for intermittently es
tablishing a drive connection between said shaft
40 and said levers.
Other objects and advantages of the invention
will be apparent from the following description
when taken in conjunction with the accompany
ing sheets of drawings, wherein
Fig. 1 is a partial front elevation showing a
boiler to which my novel stoker mechanism has
been applied.
Fig. 2 is a side elevation of the mechanism and
boiler with portions of the latter broken away.
Fig. 3 is a partial elevational view from the
opposite side of the apparatus but with parts
broken away to show the fuel feeding means.
Fig. 4 is a plan view of the grate operating
mechanism.
Fig. 5 is a front elevation thereof,v and,
apparatus of this character heretofore available.
It will be understood, of course, that the novel 10
combinations and features of my invention, here
inafter to be explained in detail, may be embodied
in various other similar mechanisms and appa
ratus.
My improve-d stoker mechanism may be applied 15
to various types of boilers, but is especially useful
in connection with boilers of the Scotch or return
tubular type. In Figs. 1 and 2 of the drawings
I have shown my stoker mechanism applied to a
boiler III which is a boiler of the latter type. As
is usual in boilers of this type, a tubular corru
gated furnace || extends inwardly from the front
head or tube sheet l2 of the boiler. The outer
end of the furnace II is provided with a furnace
front l3 which forms a support for the various 25
furnace front ?ttings, such as the ?re door M
and ash pit door l5, and also provides a support
for my stoker mechanism.
As is well understood
in this art, this furnace front may also embody
an arrangement of air passages and dampers, and 30
also provides a support for the outer ends of the
grate bars or elements.
A grate l‘l extends into the furnace || sub
stantially at the transverse mid-plane thereof
and divides the interior of the furnace into a ?re 35
box l8 and an ash pit IS. The grate may com
prise sets of reciprocable elements such as the
sets 20 and 2| of grate bars, the individual bars
of the set 2|] being disposed between the indi
vidual bars of the set 2|. The grate bars com 40
prising the set 20 may be supported at their outer
end upon a transversely extending bridge or arch
22, which is rockably mounted in the furnace
front. The outer ends of the bars of the set 2|
may be supported upon a similar transverse rock
ing bridge or arch 23. The inner ends of both
sets of grate bars may be slidably supported upon
a transverse bar 24 which is provided in the fur
nace adjacent the inner end thereof. The outer
ends of the bars of the sets 20 and 2| may be
prevented from becoming disengaged from the
rocking arches 22 and 23 by providing the bars
of the sets with notches 25 in which the respec
tive arches engage. Reciprocating movement is
imparted to the sets of grate bars by rocking the 55
2
2,109,914
arches 22 and 23 and, as will be explained herein
after, this reciprocating of the grate bars takes
place in timed relation, such that fuel supplied
to the outer end of the grate will travel slowly
inwardly along the grate while combustion is tak
ing place. As is well understood in the art, the
ashes from the fuel will either drop through the
spaces between the grate bars or be discharged
over the inclined inner ends 28 thereof to drop
into the ash pit l9.
Fuel may be supplied to the grate either
through the opening closed by the ?re door 14,
or preferably by means of my novel fuel feeding
means. This fuel feeding means comprises a
15 hopper 28 which is suitably supported on the
furnace front above the ?re door l4 and com
municates with a downwardly inclined feed tube
29.
This feed tube communicates with or ex
tends through an opening 30 of the furnacevfront
movement of the sets of grate bars the set 20 is
retracted ?rst and the set 2! is retracted at a
later interval. The set 20 is, therefore, referred
to as the leading set and the set 2i as the fol-
lowing set.
5
As best shown in Figs. 5 to 8 inclusive the grate
actuating mechanism 49 includes levers 5i and
52 which may be arranged on the transverse
oscillating shaft 44 and which may, by means
hereinafter to be described, be intermittently _
connected with the shaft to be driven or swung
thereby. Each of these levers is constructed
with an enlarged upper head part 53 through
which the transverse shaft 44 extends and with
spaced depending parts providing a pair of arms
54. The pairs of arms 54 are provided with open
ings accommodating transverse pins 55. The
lever 51 is o-perably connected with the rocking
arch 22, for the operation of the leading set of
20 above the ?re door l4, so that fuel fed through
grate bars 20, by suitable means such as a con~
the tube may be deposited upon the outer end
necting rod 5? having one end pivoted to the arch
and its other end mounted on the pin
Since
the lever 5! is connected with and operates the
leading set of grate bars 28 it may be referred to
as the leading lever. The lever 52 is operably
connected with the arch 23 by means of a simi
of the grate. A correspondingly inclined recip
rocable plate 3! forms the bottom of the feed
tube which, supplemented by the action of grav
ity, causes the fuel to be advanced in the tube.
Reciprocation may be imparted to the inclined
plate 31, as by means of a rock shaft 32 and
levers 33 carried by the rock shaft and operably
engaging the outer end of the plate. The rock
is connected with the following set of grate bars
shaft 32 may be oscillated by any suitable means
such as by motion transmitted through the con
it may be referred to as the following lever.
The enlarged head portions 53 of the levers 5! and 52 are of hollow construction so that each
necting rod 34 and the lever 35.
lever provides a substantially dust-proof cham
If desired, the
inclined plate 3i may be provided with one or
more transverse shoulders 35 arranged to assist
the feeding of fuel along the tube.
From the arrangement of fuel feeding means
just described it will be seen, that when a quan
tity of fuel is placed in the hopper 28 it will be
supported in part by the plate 3| forming the
40 bottom of the feed tube.
The inclination of the
feed tube and the reciprocation of the plate 3!
will cause the fuel to travel along the feed tube
at a desired rate and substantially without clog
ging or obstruction and to be supplied to the
outer end of the grate.
To supply power for the operation of the grate
I‘! and the feed plate 31 I may employ an elec
tric motor 40 or other suitable power means.
The motor employed in this instance is drivingly
connected with a speed reducing mechanism 4!
by means of a belt 42. The reduction gear 4! is
provided with a crank 43 which is connected with
an oscillating grate-operating shaft 44 by means
of a. connecting rod 45 and a lever 46 mounted
upon the adjacent end of the oscillating shaft.
As shown in Figs. 1 and 2, the oscillating shaft
44 extends transversely of the furnace front just
outwardly of the ends of the grate bars and may
be supported upon the furnace front by suitable
60 laterally spaced bearings 4‘! and 48. Motion is
transmitted from the oscillating shaft 44 to the
sets of grate bars by mechanism 49 which will
presently be described in detail.
Before‘ describing in detail the construction
65 and operation of the grate actuating mechanism
49, I wish to explain brie?y that the timed operation of the sets of grate bars consists in. impart
ing movement to these elements such that both
sets of grate bars move inwardly substantially
70 simultaneously to move the fuel toward the inner
end of the furnace and then the sets of grate
bars are retracted independently of each other
at spaced timed intervals preparatory to both
sets of grate bars being again moved inwardly
75
lar suitable connecting rod 58 and since this level;
substantially simultaneously. LIIn the retracting
ber or casing 68 for certain cooperating power
transmitting members. For the lever 5! these
power transmitting members comprise a ratchet
62 which is non—rotatably mounted on the trans
verse shaft 44 and a pawl 63 which is pivoted on
the lever for cooperation with the ratchet. The
pivot for the pawl 63 is formed by a shaft G4
which projects outwardly of the casing or cham-~
ber 60 so that the pawl may be actuated from
the exterior of the casing. For the lever 52 the
power transmitting members operable in its cas
ing 60 comprise a ratchet 66 which is non-ro
tatably mounted upon the shaft 44 and a pawl
61 which is pivoted by being mounted upon a
shaft 68 which extends exteriorly of the casing.
In the casing of the lever 5| an abutment B9 is
provided at a point spaced from the pawl E23, so
that upon rotation of the shaft 44 in one direc
tion the ratchet 62 will engage this abutment,
and upon rotation of the shaft in the opposite
direction the ratchet will engage the pawl 63.
Similarly, an abutment 10 is provided in the
casing of the lever 52 such that upon rotation
50
of the shaft 44 in one direction the ratchet 66
will engage this abutment, and upon rotation of
the shaft in the opposite direction the ratchet
will engage the pawl 61. The levers 5i and 52 are
preferably not mounted directly upon the shaft
44, but are journaled upon laterally extending
sleeve portions of the respective ratchets E32 and
65 so that oscillation of the shaft 44 may take
place without imparting movement to the levers
until the ratchets thereof engage either the abut
ments or the pawls, whereupon driving connec
tion from the shaft to the levers is established.
The ends of the pawl shaft 64 of the lever 5|
project outwardly at opposite sides of the casing
(ill, and upon these ends are mounted the levers 70
12 and 13 for operation. of the pawl from the ex
terior of the casing. A tension spring '54 hav
ing one end anchored to the casing 68 and the
other end connected to the lever 12 urges the
latter in a direction to swing the pawl 63 into 75
2,109,914
the path of movement of the ratchet 62. The
lever 13, as shown in Fig. 5, is provided with a
laterally projecting lug 15 which extends into the
path of movement of a cam 16 provided on the
exterior of the casing of the lever 52. One end
of the pawl shaft 68 projects outwardly from
the casing of the lever 52 and upon this project
ing end is mounted a lever TI. A tension spring
> 18 (see Fig. 8) having one end anchored to the
10 casing is connected with the lever 11 and nor
mally urges the same in a direction to swing the
pawl 61 into the path of movement of the
ratchet 66.
Assuming now that the parts of the grate actu
15 ating mechanism 49 are in the relative positions
shown in Figs. 6 and 7 and that the shaft 44 is
oscillated or rotated in a counter-clockwise direc
tion, it will be seen that the ratchets 62 and 66
will engage, respectively, the pawl 63 and the
20 abutment 10. This action will result in both
levers 5| and 52 being swung in a direction to
transmit pushing force to the connecting rods 51
and 58 and will cause simultaneous inward move
ment of the sets of grate bars 20 and 2|.
25
It is
desirable that while this movement is taking place
the pawl 61 be swung out of the path of move
ment of the ratchet 66, ‘and for this purpose, I
provide means whereby the movement of the pawl
61 into and out of power transmitting position
30 is caused by the action of the other lever 5|. To
this end I provide a countershaft 80 which may
be rockably mounted in bracket plates 8| and 82
and extends in spaced substantially parallel rela
tion with the shaft 44. A lever 83 mounted on
' the countershaft is connected with the lever 5|
by a link 84, so that movement imparted to the
lever 5| by the shaft 44 will cause oscillation of
the countershaft 80. Another lever 85, mounted
on the countershaft 80 (see Fig. 8) is connected
with a member 86 so that oscillations imparted
to the countershaft will cause reciprocation of
the latter member‘. The member 86 is in the
form of a lever having a cam part 81 at its free
end for cooperation with a pin 88 projecting from
The member 86 may be supported
and guided in any suitable manner, such as by
providing the same with a fork portion 89 which
slidably straddles an auxiliary shaft 90. From
the arrangement just described it will be seen
45 the lever 11.
that while the lever 5| is being swung in a coun
ter-clockwise direction motion is transmitted
through the countershaft 80 and the member 86
to cause the cam portion 81 to engage the pin
88 of the lever 11. This causes the lever 11 to
55 swing in a direction to lift the pawl 61 out of the
path of movement of the ratchet 66.
The purpose of lifting the pawl 61 out of the
path of the ratchet ‘66 is to render the drive con
nection between the shaft 44 and the lever 52 in
effective during the next succeeding oscillation
of the shaft 44, so that the following set of grate
bars 2| will remain stationary while the leading
set of grate bars 26 is being retracted. Following
the counter-clockwise rotation of the shaft 44
65 mentioned above, this shaft is rotated in a clock
wise direction, and since the pawl 61 has been
moved out of the path of the ratchet 66 no drive
connection for the lever 52 is established at this
time. However, the clockwise rotation of the
70 shaft 44 causes the ratchet 62 to engage the abut
ment 69 of the lever 5| and thereby cause the
lever to be swung in a direction to exert a pull
ing force on the connecting rod 51 to retract the
75
leading set of grate bars 28.
It is desirable that during the retracting move
3
ment of the grate bars 26 the pawl 63 be lifted out
of the path of the ratchet 62, so that during the
next succeeding oscillation of the shaft 44 there
will be no driving connection to the lever 5|.
For thus moving the pawl 63 out of the path of
the ratchet 62 I have provided the cam 16 on
the head portion of the lever 52. It will thus be
seen that by this means I utilize the action of
the lever 52 to cause the pawl 63 for the other
lever 5| to be moved into and out of power trans IO
mitting position. While the lever 5| is being
swung by the action of the ratchet on the abut
ment 69 to thereby retract the grate bars 20, the
lever 52 remains stationary because of the pawl
61 having been lifted out of the path of the 15
ratchet 66, as explained above, and the lug 15
of the lever 13 rides up on the cam 16 and thereby
causes the shaft 64 to be rotated in a direction
to lift the pawl 63 out of the path of the ratchet
62.
20
This same movement of the lever 5|, which
causes the lug 15 to ride up on the cam 16, also
causes the countershaft 80 to be rotated in a
direction to cause the cam 8'1‘ to be retracted.
The retracting of the cam 8‘! allows the tension 25
spring '58 to- act upon the lever 11, but at this
time the ratchet 66 is beneath the pawl 61 which
prevents the lever from being swung. However,
upon the next succeeding oscillation of the shaft
44 which is a counter-clockwise rotation thereof, 30
the ratchet 66 is moved out from beneath the
pawl 61, allowing the spring 78 to cause the pawl
to be moved inwardly behind the ratchet into the
path of movement thereof. This last mentioned
counter-clockwise oscillation of the shaft 44 is an 35
idle stroke, because at this time both pawls 63
and 61 are being retained in their outer or lifted
positions and the ratchets are then spaced angu
larly from the abutments 69 and 16.
The next succeeding oscillation of the shaft 44 40
is a clockwise rotation, and since the pawl 67 has
been moved back into the path of the ratchet 66,
it is immediately engaged thereby and a drive
connection from the shaft to the lever 52 is thus
established. The lever 52 is thereupon swung in 45
a direction to exert a pulling force on the con
necting rod 58 which causes the following set of
grate bars 2| to be retracted. The clockwise
rotation of the shaft 44 which results in the grate
bars 2| being retracted, as just explained, does 50
not impart any movement to the lever 5| because
at this time the ratchet 62 is being moved back
toward the abutment 69. The next succeeding
oscillation of the shaft 44 is the counter-clock
wise rotation ?rst referred to above, which causes 55
both sets of grate bars to be moved inwardly sub
stantially simultaneously in the manner already
explained.
Because of the frictional drag and possibly
other factors, there is a tendency for the grate 60
bars 2| to be retracted at the same time that the
grate bars 20 are being retracted, and also for
the lever 5| to swing in a counter-clockwise direc
tion during the retracting of the grate bars 2|.
It is, therefore, desirable to provide hold-back
means for preventing such untimely retracting of
the grate bars 2| and swinging of the lever 5|.
For the lever 5| this hold-back means may be
in the form of a bar 92 which is straddled by
the arms 54 of this lever. Laterally extending 70
abutments or stops 93 may be provided adjacent
the outer end of this bar to be engaged by the
parts 94 of the arms 54 upon the completion of
the retracting movement of the grate bars 20.
This engagement of the arms 54 with these abut 76
4.
2,109,914
ments prevents the lever 5| from being rotated
farther in a counter-clockwise direction during
the retracting oscillation of the lever 52.
The hold-back means for the lever 52, may be
in the form of a pivoted lever or pawl 95, a por
tion of which is adapted to be straddled by the
arms 54 of the lever 52. The lever 95 is provided
adjacent the outer end thereof with laterally
extending shoulders or abutments 96 adapted to
10 be engaged by the parts 91 of the arms 54 when
the lever has been swung upwardly into the path
of movement of these arms. The lever 95 is
acted upon by a counterweight 98, or the equiva
lent, tending to swing the same upwardly to
15 bring the abutments 96 into the path of the
arms 54. During a part of the cycle of opera
tion, however,- the lever 95 is held against such
upward swinging movement by the engagement
of the arcuate portions 99 thereof with the end
faces I00 of the arms 54. When the lever 52 has
been swung in a counterclockwise direction to a
position such that the faces I00 clear the arcuate
portions 99 of the lever 95, the latter swings up
wardly under the in?uence of the counterweight
25 98 to bring the abutments 95 into the path of the
parts 91. Upon return movement of the lever 52
the parts 9'! engage the abutments 96 and the
lever 52 is thereby held against further swinging
movement while the grate bars 20 are being re
30 tractéd. The extent to which the lever 95 may
connected to the member I03 to normally hold
the same against the lug I01.
Since, during the simultaneous inward move
ment of both sets of grate bars, the forked part
I05 misses the lug I01 as just explained, the lever
95 will swing upwardly as soon as the arm por
tions 91 of the lever 52 clear the abutments 95.
During the succeeding clockwise rotation of the
shaft 44 which retracts the grate bars 20, the
lever 95 will hold the lever 52 against retracting 10
movement, and at this time the lever I04 lifts the
member I03. The lifting of the forked part I05
and the action of the spring I I I cause the arm I09
to ratchet over the lug I05 which is then in its
upper position. On the next counter-clockwise 15
oscillation of shaft 44, which is the above-men
tioned idle oscillation, the member I03 is again
moved downwardly but at this time the lug I05
engages in the forked part I05 and the lever 95 is
therefore now moved downwardly to its inopera 20
tive position preparatory to retracting of the
grate bars 2| during the succeeding clockwise os
cillation of shaft 44.
If desired, a manually operable control may be
provided for rendering the grate operating mech
anism inoperative. This control may be in the
form of a hand crank I I2 which is mounted upon,
and drivingly connected with, an extension of
the shaft 90 so that by swinging the hand crank
the shaft 90 may be oscillated. A curved lever 30
H3 is carried by the shaft 90, as shown in Fig. 8,
and is adapted to be swung thereby to engage the
be swung upwardly may be limited by lugs IOI
which are provided thereon to engage the end
lug 88 of the lever TI to lift the pawl 61 out of
faces I00 of the arms 54.
To permit swinging of the lever 52 to retract the path of the ratchet 66. The bracket plate
the grate bars H at the proper time after the 82 may, if desired, be provided with arcuately
retraction of the grate bars 20, it is necessary to spaced openings H4 in which a slidable locking
swing the lever 05 downwardly to move the abut~ pin II5 of the crank handle II6 may engage. It
ments 96 out of the path of the arms 54 and for is desirable to prevent operation of the manual
this purpose I provide a member I03 which is control at a time when movement of the pawl 61
into or out of the path of the ratchet 66 would
40 pivotally connected to, and actuated by, a lever
I04 (see Fig. 8) having driving connection with cause incorrect operation or damage to the ap
the shaft 44. The lower end of the member I03 is paratus, and for this purpose I provide suitable
inhibiting means for preventing manual opera~
provided with a fork~like part Hi5 which en
gages a laterally projecting pin I05 of the lever tion of the control at such times. This inhibiting
means may comprise a laterally projecting lug
95 to move the latter downwardly to the inopera
II‘! on the crank H2, and a stop II8 carried by
tive position mentioned above. It will be seen
from the arrangement just described that the the shaft 44 and shaped to be engaged by the lug
I I1 during such part of the operating cycle when
movement of the lever 95‘ to inoperative position
is caused by a counter-clockwise oscillation of the pawl 61 is not to be manually engaged or dis
the shaft 44. It is desirable, however, that the engaged.
50 lever 95 be moved to its inoperative position by the
I have referred above to the connecting rod 34
member I 03 only during the above-mentioned of the fuel feeding means being operated from any
idle counter-clockwise oscillation of the power suitable source of power and, if desired, this mem
shaft 44, and therefore, I construct and arrange ber may have operative connection with the oscil
lating shaft 44, so that the fuel feeding means
the parts such that the forked part !05 will en
55 gage the lug I 06 while the latter is in its elevated will be operated in timed relation to the actua
position as represented by the broken lines of tion of the sets of grate bars. For this purpose
Fig. 8, but will not engage this lug while it is in its I may provide the shaft 44 with a lever I20 with
lower position as shown in full lines in Fig. 8. which the connecting rod 34 has adjustable con
nection. This adjustable connection may com
To obtain this result I provide a laterally project
60
ing lug I01 on the member 06 and a cam part I08 prise a screw I2I mounted on the lever I20 and a
on the member I03. During the time that both nut I22 operable along the screw and to which
the rod 34 is connected. By rotation of the
sets of grate bars are being moved inwardly si
multaneously the member E03 is being moved screw I2I the position of the nut I22 relative to
downwardly by the lever I04, but at this same the axis of the shaft 44 may be varied to thereby
65 time the member 86 is being actuated from the vary the length of the stroke of the connecting
countershaft 00 to lift the pawl. 61. The lug I01 rod 34 and thereby vary the rate of fuel feed.
Without attempting to summarize all of the
engaging the member I03 causes the latter to be
advantages
and novel features of my stoker
swung toward the right, as seen in Fig. 8, so that
the forked part I05 will miss the lug I05. The mechanism, I wish to call attention to the fact
70 passage of the forked part I05 clear of the lug that in the operation of the grate operating mech
I06 in this manner may be facilitated by making anism, as explained above, the movement of the
the arm I09 of the forked part relatively short pawls 63 and 6'! into and out of power transmit
and by providing this arm with an inclined end ting cooperation with the ratchets takes place
face IIO. If desired, a tension spring III may be only while the pawls are not under load. This is
75
35
40
45
50
60
75.
2,109,914
an'important advantage, because it minimizes
5
shaft and operably connected with said grate,
wear on the cooperating parts and thereby en
means for intermittently connecting said mem
ables the apparatus to render prolonged efficient
service. Further in this connection, it should be
ber for actuation by said shaft, and easing means
carried by said member in surrounding relation
to the connecting means and adapted to exclude
foreign matter from said connecting means.
6. In a grate operating mechanism, a grate,
an operating shaft, a dust-proof hollow casing
into which said shaft extends, means operably
connected with said grate and with said casing
noted that the casings provided on the levers 5|
and 52 exclude ashes and other gritty foreign
matter from the cooperating power transmitting
parts and thus eliminate the destructive abrading
action heretofore present in devices of this char
acter.
I
While I have illustrated and described the
stoker mechanism of my invention in a somewhat
detailed manner, it will be understood, of course,
that I do not wish to be limited to these precise
15 details of construction and arrangements of parts,
but regard my invention as including such
changes and modi?cations as do not constitute a
departure from the spirit and scope of the in
vention herein disclosed.
Having thus described my invention I claim:
20
1. In combination, a plurality of sets of grate
bars, ‘a power shaft, a plurality of members jour
naled to rock about said shaft and corresponding
in number with said sets of bars, said members
each havinga chambered hub portion and a pro
jecting arm, means connecting the arms of said
members with the respective sets of bars, and
means housed in said chambered hub portions
and operable therein for intermittently estab
30 lishing a driving connection between said shaft
and said members.
2. In combination, a pair of sets of longitudi
nally extending grate bars, a transverse power
shaft mounted for rocking about its own axis,
a pair of members journaled to rock about said
shaft, said members each having a chambered
hub portion and a projecting arm, means con
necting the arms of said members with said sets
of grate bars, means for actuating said shaft,
and means for intermittently establishing a driv
ing connection between said shaft and said mem
bers including cooperating parts contained in
said chambered hub portions.
3. In combination a plurality of sets of grate
bars, a, power shaft mounted to rock about its
axis, a plurality of members mounted to oscil
late about said shaft and corresponding in num
ber with said sets of bars, said members each
having a chambered hub portion and a lever por
tion, means connecting the lever portions of said
50
members with the respective sets of bars, means
for oscillating said shaft, and means for inter
mittently establishing a driving connection be
tween said shaft and said members including a
pair of abutment elements contained in the hub
chamber of each member and ratchet elements
on the shaft and extending into the hub cham
bers for cooperation with the abutment elements
therein.
4. In apparatus of the character described the
at a point eccentric to said shaft for transmitting
motion to the grate, means for driving said shaft,
and means in said casing for‘ intermittently con
necting the same with said shaft.
7. In a grate operating mechanism, a grate 15
comprising a pair of sets of grate bars, an operat
ing shaft, a pair of hollow casings into which said
shaft extends, means mounting said casings side
by side to swing in substantially parallel planes
about said shaft, means connecting said sets of
bars with the respective casings at a point eccen
tric to the axis of said shaft, and means in each
casing adapted to releasably connect the same
for actuation by said shaft.
8. In combination, a grate comprising a pair
of sets of movable grate bars, a power shaft,
means associated with each set of bars and pro
viding a releasable drive between the same and
said shaft, and means actuated by the drive
means for one set of bars for rendering the drive
means for the other set of bars effective and in
effective as an operating connection between said
shaft and said other set of bars.
9. In combination, a grate comprising a pair
of sets of movable grate bars, an oscillating power
shaft, means providing a releasable driving con
nection between one set of bars and said shaft,
and means providing a releasable driving connec
tion between the other set of bars and said shaft,
the driving means for one set of bars being ren
dered effective and ineffective as an operating
mechanism between said shaft and said one set
of bars by action of the driving means for the
other set of bars whereby said sets of bars are
actuated in timed relation to each other.
10. In combination, a pair of sets of grate ele—
ments, an oscillating power shaft, a pair of le
vers on said shaft connected respectively with
said sets of grate elements for actuating the lat
ter, each of said levers having a chamber and
a pair of spaced abutments thereon in such cham
40
45
50
engage one abutment upon rotation of the shaft 55
in one direction and to drivingly engage the other
abutment upon rotation of the shaft in the op
posite direction.
11. In combination, a movable grate structure,
an oscillating shaft, a lever on said shaft, said 60
erably connecting said levers with said sets of
bars, and means adapted to intermittently estab
70 lish connections for causing oscillation of said
tion and for driving engagement with the other
abutment on rotation of the shaft in the opposite
direction, one of said abutments being movable
into and out of position to be engaged by the
5. In a grate operating mechanism, a grate, an
75 operating shaft, a member oscillatable on said
30
tending into the chambers and between the
abutments on each lever and adapted to drivingly
lever being provided with a chamber adjacent
the shaft, means connecting said grate structure
for actuation by said lever, a pair of abutments
carried respectively by the shaft and the levers
and operable in the chambers of the latter.
25
her, and ratchet-like means on said shaft ex
combination of a grate comprising a pair of sets
of longitudinally movable grate bars, a transverse
shaft adjacent one end of the grate and mounted
to rock about its axis, means for oscillating said
65 shaft, a pair of levers each having an opening
through which said shaft extends and a chamber
therein adjacent the shaft opening, means op
levers by said shaft including cooperating parts
20
on said lever in the chamber thereof, and ratch
et-like means on said shaft and extending into 65
said chamber for driving engagement with one
abutment on rotation of the shaft in one direc
driving means of the shaft.
12. In apparatus of the character described
the combination of a pair of sets of movable grate
elements, an oscillating shaft, a pair of levers 75
6
2,109,914
connected respectively with said sets vof grate
elements, and means associated with each lever
for providing a releasable driving connection be
tween the same and said shaft, each lever being
provided with a substantially dust-tight chamber
formed as an integral part of the lever and
in which its releasable driving means is disposed.
13. In apparatus of the character described
the combination of a pair of sets of movable
grate elements, an oscillating shaft, a pair of
levers connected respectively with said sets of
grate elements and each being provided with a
chamber, means on said shaft extending into
the chambers of said levers for transmitting mo
15 tion to the levers from the shaft, and abutments
in said chambers adapted to be engaged by the
last mentioned means including pawls movable
into and out of position to be engaged by said
means.
20
14. In apparatus of the character described
the combination of a pair of sets of movable
grate elements, an oscillating shaft, a pair of
levers on said shaft connected respectively with
said sets of grate elements and each being pro
25 vided with a chamber, means on said shaft ex
tending into the chambers of said levers for trans
mitting motion to the levers from the shaft,
abutments in said chambers adapted to be en
gaged by the last mentioned means including
30 pawls movable into and out of position to be
engaged by said means, and means arranged to
be actuated by movement of each lever for actu
ating the pawl of the other lever.
15. In apparatus of the character described
the combination of a plurality of sets of recipro
cable grate elements, said sets being arranged 5
for substantially simultaneous forward movement
and individual retracting movement, an oscil
lating power shaft, a pair of levers on said shaft
and having connection with the respective sets
of grate elements, each of said levers being pro 10
vided with a chamber, means housed in the
chambers of the levers and operable for inter
mittently establishing a drive connection be
tween the shaft and said levers for causing for
ward and retracting movement of the sets of 15
grate elements in timed relation, and means for
preventing retracting movement of one or said
levers during the retracting movement of the
other.
16. In apparatus of the character described 20
the combination of a movable grate structure, an
oscillating power shaft, means for transmitting
motion from said shaft to said grate structure
including a pawl, manual means for causing
movement of said pawl into or out of operative
position, and means carried by said shaft and
movable thereby into position for rendering said
manual means inoperative during a portion of the
operating movement of said shaft.
GEORGE VON HAASE.
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