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Nov, 5, 1946.
Filed 001:. 19, 1944
5 ‘Sheets;Sheé't 1
Nov. 5, 1946;
Filed Oct. 19, 1944
5 Sheets-Sheet 2
Carla i'oizi?Steilw,
‘ Nov. 5; 1946.
Filed’ Oct. 19, 1944
5 Sheets-Sheet 5
Nov. 5, 1945.
> c. K. STEINS
Filed Oct. 19, 1944
5 Sheets-Sheet; 4
vll | | |
r I I
N09. 5, 1946.
c, K. STEINS _
2,410,529 ‘
Filed Oct. 19, 1944
s Sheeté-Sheet s
Patented Nov. 5, 1946‘
Carleton K. Steins,-Merion, Pa., assignor to The
Pennsylvania Railroad Company, Philadelphia,
Pa" a corporation of Pennsylvania
Application October 19, 1944, Serial No. 559,396
2 Claims. (Cl. 110-45)
This invention relates to stokers, that is to say, I
posed somewhat below the top edge of the hop
per wall, and which is peripherally reinforced by
into furnaces; and it is concerned more para ring l5 of stout wire. Surrounding the dis
ticularly with stokers intended for domestic’ use.
The chief aim of my invention is to provide 5 charge opening of the hopper I0 is a reinforcing
outlet annulus it which is internally recessed as
a stoker of the sort referred to which is simple ,
in Fig. 6 to fit over an; annular seat i'l'
and compact; which is immune against easy de
around the top inlet opening of a casting l8 to
rangement and‘therefore reliable in operation;
which it is secured by screws 16a (Figs. 1 and 4),
which is efficient as regards fuel consumption;
casting having a diametrically enlarged bell
which is readily adaptable for position to suit 10
l9 at one end and a rearwardly-extending' lat
different types of furnaces; and which, more—
erally-o?set neck portion 20. Extending into the '
over, lends itself to economic production in quan
of the casting ill at the bell end is a cylindric
tity as considered both from the standpoint of
conduit 2| which is secured by set screws. 22
the material required, and from the standpoint
(Figs. 4 and 5) and through which the fuel is
of the labor costs involved in its construction 15 conducted from the hopper ill, in a manner
and in the assembling of its component parts.
presently explained, to a burner 23 within the
Other objects and attendant advantages will‘
?re box of the hot water furnace which is com
appear from the following description of the at
prehensively designated by the numeral 25 in
tached drawings, wherein
Figs. 1 and 3. Surrounding the conduit 2| with
to devices for automatically feeding solid fuel
Fig. 1 is a view, in side elevation, of a stoker 20 provision of an annular interval 26, is a tube 21
conveniently embodying my invention showing
of large diameter whereof the outer end ?ts into
and is secured in the mouth of the bell end l_9'
of the casting l8 by set screws 28, said tube com
municating with the passage in the offset portion
.20 of said. casting through which air is intro
the same in association with a hot water house
heating furnace which latter is fragmentarily
illustrated in cross section.
Fig. 2 shows the elevation of the outer end
i of the stoker as it appears when viewed from the
duced under pressure, also as later on explained,
support combustion of the fuel in the furnace.
hopper partly broken out and in section.
From Figs. 1 and 3 it will be noted that the conduit
Fig. 3 is a plan view of the organization shown
in Fig. 1 with a cover of the supply hopper re 30 v2| and the surrounding tube 21 extend into the
fire box of the furnace 25 through an opening ‘in
moved and portions of said hopper broken away
the side wall of the latter, said opening being
to expose important details which would other
sealed air-tight around said tube by fire-proof
wise be hidden.
packing 29 held in place by a backing member 30.
Fig. 4 is a fragmentary view in longitudinal
23 previously re'erred to is in the form
section taken as indicated by the angled arrows 35 .of aburner
casting having upturned inner and outer
IV—IV in Fig. 3.
elbow shells 3| and 32 which are respectively con
Fig. 5 is a plan view of the portion of the stoker
to the conduit 2| and the tube 21 by
shown in Fig. 4, with certain parts drawn in
screws Ma and 32a (Fig. 5). As shown the inner
horizontal section.
shell 3| .of the burner 23 is supplemented by an
Fig. 6 is a fragmentary view in section taken 40 upwardly ?ared tuyére 33 of which the periphery
as indicated, by the angled arrows VI'—-VI in
rests in a recessed annular seat in the top of the
Fig. 3.
outer shell while its lower end is engaged in an
Fig. 7 is a fragmentary view in horizontal sec
annular groove at the top of said shell, said
tion taken as indicated by the angled arrows
tuyére being perforated and formed by a series
VII—VII in Fig. 2.
of removable interlocking segments which are
Fig. 8 is a fragmentary view in vertical section
held down in place by a beveled cap ring 34- at
taken as indicated by the angled arrows
the top of the burner and secured by screws 3411
VIII-—VIII in Figs. 1 and 3: and’ '
(Figs. 3 and 9); Disposed within the conduit 2|
Fig. 9 is a detail section taken as indicated by
is a screw conveyer 35 by which the fuel is con
the angled arrows IX-IX in Figs. 1 and 3.
50 ducted from the storage hopper ID to the burner
With more Speci?c reference to these illustra
23, the shaft 36 of the screw conveyer passing
' tions, Hl designates a supply hopper for storage
through a bearing 31 set into the outer end of the
of ?nely comminuted solid fuel such, for example
bore of the casting l3. With its outlet neck con
coal of buckwheat or rice sizes, said hopper being
nected to the o?set passage 20 of the casting l8
cylindric and having a frusto-conical bottom .
by screws 20a (Figs. 3 and 5) is a centrifugal
which‘ terminates in a central gravity discharge
blower 40 which is cast en bloc ‘with a shelf ll
opening. In addition to a tight ?tting cover II
is supported an electric driving motor
the hopper is provided with a coarse mesh screen
right of Fig. 1, with a portion of its fuel supply
42. As shown in Fig. 7, the shaft ‘3 of the blower .
element I! which is removably supported by a
plurality of circumferentially spaced lugs 13 dis
rotor 44 is directly connected to the shaft 45 of
the motor 42 through a coupling 48, while the
shaft 36 of the screw conveyor 35 is driven
its compactness and simplicity my improved
through speed reduction gearing within a casing
41 integrally formed with the housing of the
blower 40 and the shelf 4!. As shown, this gear
stoker can be produced and assembled at small
cost and easily, and that it can be set up at the
time of its installation for use with the furnace,
without necessitating the use of special tools or
the employment of skilled help. Since both the
- ing comprises a worm 48 on the blower shaft, and
an inter-meshing worm wheel 49 which is se- '
cured to the upper end of a'vertical shaft 50 and
which in turn carries a worm 5! that meshes
screw conveyor and the blower 40 are driven from
- a single motor through gearing enclosed in a
housing, and by reason of the fact provisions are
shaft 35. As shown in Fig. 8, the vertical shaft 10 made for self-lubrication of the moving parts
within such housing, the stoker will require no
50 is rotatively supported by bearings 53 and 54
‘attention whatever except for the renewal of
whereof the former is integrally cast with the
blower housing and of which the latter is. pro-»- ' the lubricant at long protracted intervals and
for cleaning of the burner in case it should be
vided by a closure cap 55 secured in an opening
in the bottom of the housing 41. The screw con 15 come clogged. Construction of the motor-sup
porting shelf integrally with the blower casing
veyer shaft 36 extends into the interior of the
is advantageous in that the blower, the motor
housing 4'! through_an integral bearing 56 at
and the driving gearing can be assembledv and
one side of the latter and receives further rota—'
produced as a unit at the factory. The ,stoker
tive support in a separate bearing 51 provided
by a cap 58 (Fig. 7) which closes an access open 20 of my invention is further unique in that it’does
not require a pit, at the furnace for its'accom
ing 59 in the opposite side of said housing. For
modation and in that it is bodily adjustable verti~
convenience of access to its interior, the gear
cally and therefore. easily adaptable to furnaces
housing 41 is provided with a removable cover
of different types.
55. It is kept ?lled with oil to the level indicated
Having thus described my invention, I claim:
at L in Fig. 8 so that the worm 5| and the wheel 25
1. A furnace stoker comprising a supply hop-.
52 as well as the bearings 53, 54 and 56, 51 for
per for solid fuel, said hopper having a bottom
the shafts 50 and 36 are continuously lubricated.
‘with a worm wheel 52 on the screw conveyor
with a forwardly-extending neck portion and a
laterally-offset rearwardly-extending communi
oil from the supply in the housing, 41 to a pendent
distributing ?n 61 on the cover 65 for conduction 30 cating neck portion; an air-conducting tube con
nected to the forwardly-extending neck portion
to the bearings 68 and 69 for said shaft. In order
of the hopper bottom and leading to a burner
that the influx of air into the blower 40 may be
‘within the furnace; a smaller fuel-conducting
regulated, there is provided a guard disk 10 which
tube within the air-conducting tube connecting
is adjustably supported by a screw bolt ‘H en
gaged in the central boss 12 of‘ a spider 13 within 35 into the hopper bottom and also leading to said
burner; a feed, screw within the fuel-conducting
the air inlet opening 14 in the outer side of the
tube having its shaft protruding through the hop
vblower casing.
per bottom at the rear; 9. motor driven blower
The storage hopper I0 is supported from the
with its casing connected to the rearwardly-ex
floor by posts 15 which are adjustable in boss
plates 16 bolted to the hopper bottom and secur 40 tending neck portion of the hopper bottom; a
motor for driving the blower; and speed reducing
able in adjusted position by set screws shown. at
; gearing interposed between the blower shaft and
‘H in Figs. 1 and 2.~ The blower motor unit is
A disk 66 on the blower fan shaft 43 carries up '7
similarly supported by posts 18 which are adjust
able in lugs 19 and 80 formed on the blower cas
ing and on the shelf 4| and which are securable
in adjusted positions by set screws indicated at
BI and 82. Additional support is afforded the ‘
stoker by posts 83' adjustably engaged in the op
the‘ fuel feed screw.
2. A furnace stoker comprising a supply hop
per for solid fuel, said hopper having a bottom
with aforwardly-extending neck portion, and a
laterally-offset rearwardly-extending neck por
tion in communication with the forwardly-ex
tending neck portion; an air conducting tube con
posite ends of a transverse cradle bar ,84 welded
nected to the forwardly-extending neck portion
or otherwise secured to the bottom of the tube 21;
of the hopper bottom and adapted to lead to a
In the operation of the stoker, the fuel gravi- ‘
burner within the furnace; a smaller fuel con
tating in the hopper l0 through the bottom outlet
ducting tube within the air conducting tube con
of the latter into the bowl portion of the casting
I8 is advanced in the conduit 2i to the burner
‘ 23.
At the same time the constant stream of air
necting into the hopper bottom and also leading
to said burner; a feedscrew within the fuel con
ducting tube having its shaft protruding through
from the blower 40 is forced, by way of the offset
20 in the casting [8, into the annular clearance
26 within the tube 21' and around the conduit 2|
into the space between the inner and outer shells
3| and 32 of the burner for diffusion and dis
charge into the fuel within the burner through
the perforations in the tuyere 33. The gearing
nected to the rearwardly-extending neck portion
within the housing 41 is so proportioned that the '
screw conveyor 35 and the blower 40 are driven
connected to the protruding end of the fan shaft,
at relative speeds such that the burner 23 is
kept filled with fuel and an adequate supply of
air is furnished to insure complete combustion. .
the hopper bottom at the rear; and a combined
air supply and power unit including a blower
fan having a casing with the outlet thereof con
of the hopper bottom, and a closed housing lat- ‘
erally offset from the casing through which the
fan shaft extends horizontally, a motor directly
a power shaft connected to the protruding end
of the fuel feed screw aforesaid and extending
into the housing, and speed reduction gearing
within said housing interposed between said
power shaft and said fan shaft whereby the feed
As the fuel is consumed, the ashes arespilled
over the edges of the cap ring 34 on the burner
23 into the ash pit at the bottom of the furnace, 70 screw is driven at reduced speed from said‘ fan
this movement of the ashes being facilitated by
reason of the beveling of said cap ring 34.
From the foregoing it- will be seen that due to
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