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Патент USA US2412193

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Dec‘ 10’ 1946'
I
A. o. ANDERSON
-
-
‘-
2,412,193
FUEL FEEDING APPARATUS
Filed Aug. 2a, 1945
‘
4 Sheets-Sheet 1
IN VEN TOR.
A T TORNEYJ
Dec. 10, 1946.
2,412,193
A. O. ANDERSON
FUEL FEEDING APPARATUS
Filed Aug. 23, 1945
4 Sheets-Sheet 2
INVENTOR.
?c'f/zur Q?ndew‘ou
%. 21 aémzfxdaa’w
BY
AT TOPNE YU'
Dec. 10, 1946.
A. o. ANDERSON
2,412,193
FUEL FEEDING APPARATUS
Filed Aug. 23, 1945
4 Sheets-Sheet 3
IN VEN TOR.
ATTOPNE YS
Dec. 10, 1946.
-
A, Q ANDERSON
‘
2,412,193
FUEL FEEDING APPARATUS
Filed Aug. 23, 1945
4 Sheets-Sheet 4
ATTORNEYJ
2,412,193
Patented Dec. 10, 1946
UNITED STATES PATENT OFFICE
2,412,193
FUEL FEEDING APPARATUS
Arthur 0. Anderson, Davenport, Iowa
Application August 23, 1945, Serial’No. 612,289
7 Claims.
(01. 198-213)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
2
1
The invention described herein may be manu
factured and used by or for the Government for
itating repair and/or adjustment necessary to as
sure smooth and e?icient operation of the fuel
governmental purposes, without the payment to
feeding mechanism.
me of any royalty thereon.
Another object of my invention is to furnish
a sectioned combination coupling and fuel cham
her for the conveyor tube of an automatic stoker
The present invention relates generally to the
art'of fuel feeding. More particularly, it pro
videsfor an improved ‘attachment for a solid
which may be opened substantially through 360°
fuel feeding apparatus of ,a standard heating
furnace which comprises means for speedy and
easy access to the interior of the feed mechanism
by manual release of a simple locking means.
A further object of the present invention is
the provision of a modi?ed fuel conveyor tube for
an automatic stoker adapted to receive a readily
housing.
'
>
'
’
Speci?cally, the improved attachment includes
a hinged interiorly tapered combination coupling
and coal chamber adapted to house the feed
removable ?anged coupling and fuel chamber.
, An additional and important object of my in
vention is the construction of a coupling forthe
mechanism of a conventional automatic stoker.
conveyor tube of an automatic stoker adapted for
The chamber is provided with releasable locking
means-and may be opened for exposing said feed
mechanism through 360° by manual manipula
compression of the fuel into the grooves of the
fuel feeding means substantially entirely within
the coupling.
.
A still further object .of my invention is the
In the past in connection with the operation 20 provision of a combination coupling and fuel
chamber adapted for installation into existing
of solid fuel stokers, especially with the under’~
stoker assemblies with relatively few alterations
feed type, it occasionally has been found that a
to the existing plant.
relatively-large piece of steel or other hard ma
tion of the locking means.
,
' Preferred embodiments of my invention where
terial has become mixed with coal in the bin or
hopper in which it was contained in such a man~ 25 by I attain the above and other and further ob
her that the foreign matter has been fed along
with the coal into the feeding tube where it some
times came in contact with the fuel feeding
mechanism and became wedged between the fuel
feeding mechanism and the tube housing it, in
such a manner. as to stop rotation of said fuel
feeding mechanism.
When this occurs a shear
pin normally employed in the fuel feed drive
shaft is broken, thereby severing the connection
between, the prime mover and the drive shaft.
In such a contingency, it is usually necessary to
shovel all of the coal away from the fuel outlet
in the bin, when such a receptacle is used for the
fuel, and to employ a lever arm or other tool for
manually reversing rotation of the torque screw
or other feeding means to disengage the steel or
other foreign object. In cases where a hopper
is used it is usually necessary to completely un
load the hopper in order to gain access to the in
jects are illustrated in the accompanying draw
ings in which like numerals refer to like parts
throughout the several views and wherein:
Fig. 1 is a schematic layout showing one form
or arrangement of a solid fuel bin or hopper, a
fuel feeding tube, a furnace and the attachment
constituting the improvement of the present in
vention;
Fig. 2 is a perspective view illustrating the
35 means of application of the fuel chamber vcou
pling to the conveyor tube of a stoker and shows
one form of lockingmeans used to retain the
coupling member in locked relationship relative
to said conveyor tube;
, v
Fig. 3 is a side elevation, partly in section,
showing the interiorly tapered coupling member
and the manner in which it is attached to the
conveyor tube of a stoker;
Fig. 4 is an end view .of the hinged coupling
terior of the housing of the fuel feeding mech 45 device in opened position;
Fig. 5 is an end view of the coupling device
anism. After removal of a foreign body a new
of Fig. 4 showing the device in closed and locked
shear ,pin may be inserted in the driving shaft,
position; .
the hopper reloaded and the stoker again placed.
in operation.
'
Fig. 6 is a view of the conveyor and’fuel feed
Obviously the above described process is an in 50 tubes of a stoker with the hinged coupling mem
eillcient and time-consuming repair job. Ac
cordingly, one-of theobjects of the present in
vention istheiconstruction of a device providing
ber completely removed;
-
Fig. 7 is a view similar to Fig. 6 but showing
the hinged coupling secured tothe fuel feed and
conveyor tubes; and
ing- mechanism of ‘an automatic stoker for facil 55. Fig. 8 illustrates an alternative construction
convenient and speedy access to the fuel'feede
2,412,193
3
a bin or hopper for solid fuel.
4
tially U-shaped dog 24 formed integral with
for locking the hinged sections of the coupling
chamber.
Referring to Fig. 1, the numeral l designates
the body portion of the other section i2 of the
chamber 1. The dogs 22 and 24 may be rein
forced in their connections to the collars i5 and
A relatively
(6 respectively as by means of inclined ?anges
or ribs 25 and 26 as shown in Fig. 2. The two
short cylindrical fuel feeding tube 2 is connected
to the bin and has secured thereto the improved
attachment designated generally by the refer
ence numeral 3 constituting the present inven
sections. ii‘ and i2 of the coupling chamber 1
are adapted- to be releasably locked by manipu
lation of a handle 21 positioned adjacent one
tion as hereinafter described. The numeral 4
indicates a conventional furnace. The fuel bin 10 end of the locking member 23 and extending
therethrough, the locking member being adapted
I is provided with a generally circular fuel outlet
for projection against the washer 3i by the co
to which is connected the fuel feeding tube 2 as
operation of. its interiorly threaded portion with
by means of an annular ?ange member 5 adapt
the threaded part of the bolt 20.
ed to be secured to the fuel bin l by means of
The coupling chamber 1 may be further se
any suitable fastening means'such as bolts passed 15
cured against rotation relative to the ribs I8 and
through apertures 8 formed in the annular ?ange
i9 by means of a pair of dowel pins 28 adapted
member. The attachment 3 comprises a combi
to- pin the collars l5 and I6 respectively to the
nation coupling and fuel chamber 1 which is‘
annular flanges I8 and ill by means of a slot in
adapted to form a connection between the free
end of the fuel tube 2 and a fuel conveyor tube 20 each of the latter, as shown at 29 in Fig. 2. The
pin 28- is. preferably made of soft. steel and. may
8 and also to house fuel feeding mechanism
be inserted at any convenient point toss curev the
such as a torque screw or worm 8 (Fig. 2).. The
desired result. This pin is. preferably substan
conveyor tube 8 is of smaller diameter than the
tially equal in strength to the shear pin usually
tube 2, for a reason which will hereinafter be
employed
in stokers to break‘ the connection. be
come apparent.
25
tween the prime mover and the fuel feed drive
The member '1, preferably made of cast iron,
shaft in emergencies whichv may arise ‘through
is generally similar to the hollow frustum of a
conefand is interiorly tapered as at ill. (Fig. 3).
The inside diameter of the fuel chamber 1 at
the end of the taper l0- adiacent the entrance
to the conveyor tube 8 preferably is slightly less
than the inside diameter of the latter. With
this construction any impediment to continued
operation of the feeding means whichv may be
contained in. the fuel being fed by the worm 9 35
will be trapped in the chamber 1 without being
malfunctioning of the fuel feeding mechanism.
through failure of the screw or‘ worm carrying
shaft to rotate due to an‘ obstruction in the fuel
to be fed or otherwise, as is well understood in
the art. It will be-evident'that by reason of‘ the
tapering of the chamber solid‘ fuel- fed into the
interior thereof will lie-‘compressed into the spiral
grooves of the feed screw 9‘ substantially entirely
within the chamber. Consequently if there is
any foreign object mixed- with ‘the fuel‘ it. will; be
passed on to the tube 8 where it would be dif
flcult to retrieve it. The inside surface of the
chamber 1 may be either smooth or ribbed. The
chamberimay consist of- two or more substantial 40
engaged, if at all, between the feed screw and
its surrounding enclosure at some point within
the feeding chamber. Thus should lube-neces
ly identical sections (twoin the present instance)
indicated by numerals Ill and fiend hingedl-y
continuous operation of? the fuel feeding screw
sary to remove any obstruction affecting smooth
‘ it can be easily and quickly accomplished-by
connected as at l3 by means of a-pintie- M.
releasing the locking'bolt 2a, disengagingyit from
Eachof'these sections is provided‘ with twosemi
the dogs. 22 and 24- and removing the‘ hinged
chamber ‘I entirely as shown in Fig. 6’.
circular collar elements I! and “positioned at -
opposite ends'of the chamber. These‘ collar ele
Fig. 8 shows2 a. modified form of attachment
ments are g-rooved on. their inner peripheries in
the manner indicated‘at i'i'in Fig. 3', which con
designated by the numeral 1a and having all’the
characteristics- of the attachment ‘I except-that
twolocking bolts and four dogs are-employed;
Corresponding similar parts are- designated by
corresponding reference characters to- which the
struction adapts them for cooperation with
chamfered annular ?anges. or ribs i-?- and i8
formed respectively at one end ‘of- the fuel feed
tube 2 and the conveyor tube 8 for securing
the coupling in position and for preventing axial
displacement thereof. As shown most clearly- in
Figs. 2, 3-,..and '6 the flange 18 is formed on-the' ,
end-of! an adapter member 80- ‘having its other
end formed-as asleeve-fitting around the outside
of'the open end of tubes and‘ secured thereto by
exponent “ai'hasf-been added;
_
As previously mentioned-one of the important
features of my invention resides in the ease and
simplicity with which it~ may be- incorporated
into known‘ types of fuel feeding assemblies’ with
but slight modifications to the existing plant;
For example, a typical ‘installation prior to-mod
any suitable means such as welding.
Various devices for ‘maintaining the hinged 60 ification to incorporate ‘my improved coupling
will bear-ranged in- such manner thatthe- tube- 8
sections it and i 2 ‘of theschamber 1" in locked
relation. relative to eachother may be employed.
is constructed as a continuous single member
having enlargedv flange means secured to its end
Figs. 1-5 and 7 show one form of the locking
adapted for fastening directly tothe-hopper I-'. It
‘device and Fig. 8 shows an alternativev form
is- accordingly only- necessary in-such cases tore
which I have chosen to illustrate and describe
move the‘ enlarged ?ange and? substitute my
herein.
double ?anged cylindrical member 2 therefor;
"The device shown in Figs. 1-5 and 7 comprises
sever a short section from‘ the tube Elfand se
a bolt 20 'pivotally connected at one end» as'by
means-of 1a pin’ '21- to a substantially U<shaped
deg'zz which 'may be formed integralfwith the
body portion of the section H of the coupling
chamber 'l'-.- The bolt 20 is threaded at one end
and is adapted to- receive a complementary in
teriorly threaded tubular locking member 23‘-and
a-washer M and vto ?t intova second substan
70
cure the adapter ?ange 30 in place on the-sev
cred; end of. tube 8. _"I~‘he assemblyv will then ‘be
in- the condition illustrated in Fig. ‘6 in readi
uses to- receive my improved‘ coupling device '3
which may then be fitted‘ over the flanges‘ l8
and‘ i8‘ and securely ‘but i-eleasesblyv melted in
75 place by-the-bolt- 20f andlshear pins-28. his-‘there
2,412,193
5
are many known types of stoker assemblies the
details may vary‘ slightly according to the dif
ferent modi?cations encountered but in each
case the alterations necessary will be of a rela
tively minor character and extent.
Although I have illustrated and described
herein only preferred embodiments of my cou
pling chamber, it is obvious that others of many
types and variably positioned, could be used de
pending upon the length of the fuel feed tube
and -of the conveyor tube. Also my invention is
adapted among other things for use in overfeed.
underfeed and central feed stokers and it is not
therefore my intention to be limited to the un
derfeed type illustrated. .
Many alterations and modi?cations of the
present invention will no doubt occur to those
skilled in the art and I do not therefore desire
6
of said‘ fuel-feeding‘ mechanism between the
ribbed ends of said tubes and to compress fuel
between the walls of said chamber and said fuel
feeding mechanism substantially entirely-within
said chamber, means for hingedly connecting said
sections whereby they may be opened and closed
through 360° about the aforesaid portion of said
fuel-feeding mechanism, releasable latch means
for releasably looking said sections in closed posi
tion, a pair of complementary collar elements at
each end of said fuel chamber sections, means
forming a groove on the interior of each said
collar elements, each pair of said collar elements
being adapted respectively to encircle the ribbed
ends of said tubes with said grooves embracing
said ribs for substantially preventing axial dis
placement of said fuel chamber sections relative
to said tubes, and means for confining said fuel
chamber against rotation relative to said tubes.
to be restricted by the precise disclosure made
3. In a stoker for feeding solid fuel from a fuel
herein. Accordingly it is my intention to be lim 20 source to a furnace, a fuel inlet tube, means for
ited only by the prior art and the appended
connecting one end of said fuel inlet tube to said
claims.
fuel source, an annular rib on the other end of
I claim:
said fuel inlet tube, a fuel conveyor tube, one end
1. In a stoker for feeding solid fuel from a
of which is adapted to be connected to a fur
25
fuel source to a furnace, a fuel inlet tube, means
nace, an annular rib on the other end of said
for connecting one end of- said fuel inlet tube to
conveyor tube, said ribbed ends of said inlet and
said fuel source, an annular rib on the other end
conveyor tubes being coaxially spaced apart, fuel
of said fuel inlet tube, a fuel conveyor tube, one
feeding mechanism housed by said tubes but ex
end of which is adapted to be connected to a
pose-d at the spaced apart ribbed ends of said
furnace, an annular rib on the other end of 30 tubes, an interiorly tapered fuel chamber inter-'
said conveyor tube, said ribbed ends of said in
posed between the ribbed ends of said tubes, said
let and conveyor tubes being coaxially spaced
apart, fuel-feeding mechanism housed by said
tubes but exposed at the spaced apart ribbed
ends of said tubes, an interiorly tapered fuel
chamber interposed between the ribbed ends of
said tubes and having ?rst and second separable
sections, said fuel chamber being adapted to
house that portion of said fuel-feeding mecha
fuel chamber being adapted to house that por
tion of said fuel-feeding mechanism between the
ribbed ends of said tubes and to compress fuel
between the walls of said chamber and said fuel
feeding mechanism substantially entirely within
said chamber, means providing for interior access
to said chamber to expose a portion of said fuel
feeding mechanism between the ribbed ends of
nism between the ribbed ends of said tubes and 40 said tubes, a pair of collar elements respectively
to compress fuel between the walls of said cham
at opposite ends of said fuel chamber, means
ber and said fuel-feeding mechanism substan
forming a groove on the interior of each of said
tially entirely within said chamber, means for
collar elements, said collar elements being adapt
hingedly connecting said sections whereby they
ed respectively to encircle the ribbedends' of said
may be opened and closed through 360° about -pa Ll tubes with said grooves embracing said ribs for
the aforesaid portion of said fuel-feeding mech
substantially preventing axial displacement of
anism, keeper means on each of said sections,
said fuel'chamber sections relative to said tubes,
releasable latch means cooperable with said
and means for con?ning said fuel chamber
keeper means for releasably locking said sections
against rotation relative to said tubes.
in closed position, a pair of complementary coi
4. An attachment for a stoker adapted to be
lar elements at each end of said fuel chamber
releasably secured to a fuel conveyor tube of said
sections, means forming a groove on the interior
stoker, said attachment constituting a housing
of each of said collar elements, each pair of said
for a portion of the fuel feeding mechanism of
collar elements being adapted respectively to en
the stoker and comprising a fuel chamber having
circle the ribbed ends of said tubes with said ' ?rst and second separable sections, means for
grooves embracing said ribs for substantially
substantially preventing axial displacement of
preventing axial displacement of said fuel cham
said sections relative to said fuel conveyor tube,
ber sections relative to said tubes, and means for
means for hingedly connecting said sections
con?ning said fuel chamber against rotation
whereby they may be opened and closed relative
60
relative to said tubes.
to each other for exposing a portion of said fuel
2. In a stoker for feeding solid fuel from a fuel
feeding mechanism through 360°, keeper means
source to a furnace, a fuel inlet tube, means for
on each of said sections and latch means co
connecting one end of said fuel inlet tube to said
operable
with said keeper means for releasably
fuel source, an annular rib on the other end of
.
locking
said
sections relative to each other.
said fuel inlet tube, a fuel conveyor tube, one
5. An appliance for an automatic stoker adapt
end of which is adapted to be connected to a
ed to feed fuel to a furnace from a fuel source
furnace, an annular rib on the other end of said
by means of fuel feeding mechsnism housed in
conveyor tube, said ribbed ends of said inlet and
a conveyor tube, said appliance constituting a
conveyor tubes being coaxially spaced apart,
for a portion of the fuel feeding mecha
fuel-feeding mechanism housed by said tubes but 70 housing
nism and comprising an interiorly tapered fuel
exposed at the spaced apart ribbed ends of said
tubes, an interiorly tapered fuel chamber inter
posed between the ribbed ends of said tubes and
having first and second separable sections, said
fuel chamber being adapted to house that portion 76
chamber, means for connecting one end of said
chamber to said conveyor tube and coaxially
therewith, means for connecting the other end of
said chamber to a fuel inlet tube, said chamber
2,412,198
7
being adapted to compress fuel between the‘ walls
thereof and the fuel conveyor means substantially
entirely within said chamber, and means for dis
8
fuel fed therethrough between the walls thereof
and the fuel feeding means substantially entire
1r. within said chamber.
'7. A device for a stoker adapted to be releas
connecting said fuel chamber from the conveyor
secured at one end to a fuel conveyor tube
tube and the fuel inlet tube for exposing 'the 5 ably
in said stoker, and at its other end to a fuel
aforesaid chamber housed portion of the fuel
inlet tube from a fuel source, said device consti
feeding mechanism through 360'.
tuting a housing for a portion of the fuel feed
6. In combination, in a stoker for feeding solid
fuel from a fuel source to a furnace and having
fuel feeding mechanism, an interiorly tapered
fuel chamber having means for access to the in
terior thereof and adapted to house a portion of
said fuel feeding mechanism, means for connect
ing said fuel chamber to said fuel source, means
for connecting said fuel chamber to said furnace,
said tapered chamber being adapted to compress
mechanism of said stoker and comprising a ta
pered fuel chamber having at least two sections
adapted to be opened and closed relative‘ to’ each
other, and means including the aforesaid sections
for disconnecting said fuel chamber from said
conveyor tube and said fuel inlet tube for ex-'
posing said fuel feeding mechanism through 360°.
ARTHUR O. ANDERSON.
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