Improvements in Underfeed Stokers and Furnaces Heated thereby.
Year: 1898

page_text: Date of Application, 9th Aug., 1898-Accepted, 21st Jan., 1899
COMPLETE SPECIFICATION (AMENDED).
Improvements in Underfeed Stokers and Furnaces Heated thereby.
We, THE AMERICAN STOKER COMPANY, a Corporation organized under the Laws of
the State of Ohio, and having its principal place of business at No. 141, Broadway, in
the City, County, and State of New York, in the United States of America, Manu-
facturers of Mechanical Stokers, and WILFRED ROTHERY WOOD, of No. 518, Monroe
Street, in the Borough of Brooklyn, County of Kings, City and State of New York,
also in the United States of America, Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :--
Our invention relates to improvements in underfeed stokers and-furnaces-heated
thereby the object being to increase the durability and simplicity of construction
and the efficiency of action.
In the accompanying drawings,
Figure 1 is a longitudinal section of a furnace equipped with my improved stoker.
Figure 2 is a plan view of the stoker, some of the tuyere blocks being removed and
a portion over the motor being broken away.
Figure 3 is a side elevation of the forward part of the same partly broken away.
Figure 4 is an enlarged detail in transverse section showing the manner of securing
the tuyere blocks to the retort or magazine.
Figure 5 is a broken side elevation looking toward the left of Figure 4.
Figure 6 is a sectional detail representing a modification of the construction shown
in Figure 4.
Figure 7 is a transverse section on the dotted line x, x, Figure 8.
Figure 8 is a broken section on the dotted line y, y, Figure 7.
Figure 9 is a transverse section on the dotted line 2, 2, Figure 10.
Figure 10 is a side elevation partly in section of Figure 9.
Figure 11 is a plan view partly broken on the dotted line 3, 3, of Figure 8.
Figure 12 is an enlarged front elevation of the motor mechanism and adjacent
parts.
Figure 13 is a sectional side elevation of the same.
Figure 14 is a plan view of a part of the same.
Figure 15 is a sectional view of the ball-bearing mechanism.
Figure 16 is an elevation of the ball-bearing mechanism.
Figure 17 is an enlarged elevation of the actuating dog.
Figure 18 is a rear view.
Figure 10 a front view.

page_text: Figure 21, a cross section through a forge heated by an underfeed stoker and
involving our invention.
Figures 22, 23, 24 and 25 are detail views.
Figure 26 is a longitudinal section and
Figure 28, a cross section through the upper part of a modified form of forge and
Figure 27 is a longitudinal section.
Figure 29, a cross section through the upper part of still another modification.
The following is a description of the structure shown in the drawings:
Referring to Figures 1 and 2, A is the combustion chamber of a boiler or other
furnace of which B is the front wall. Set in this furnace with its top about level
with the grate surface or floor of the fire chamber is an oblong trough-shaped maga-
zine or retort C with sloping sides and an upwardly sloping rear end; and extending
forward from the retort through the front wall of the furnace is a tubular conduit D,
whose bottom is flush with the bottom of the retort as seen in Figure 1 and whose
forward end communicates with the lower end of a fuel hopper E. Journalled axially
through the conduit D is a screw-conveyor F, which enters the retort C and terminates
at a point about two thirds of the length of said retort, as seen in Figure 1. This
screw-conveyor is composed of a polygonal shaft on which are strung the sections of
interlocking flights a, whose hub portions b, have bores through them to snugly fit
the shaft and conforming to its shape in transverse section. The flights and hub
portions within the conduit are of uniform diameter and the edges of the former
closely fit the inner walls of the conduit. From the mouth of the conduit where it
enters the retort C the hub portions are gradually tapered and enlarged from the
front to the rear, as seen in Figures 1 and 2 so as to gradually reduce the carrying
capacity of the flights as they extend toward the rear of the retort. Also, if desired,
the flights themselves may be gradually diminished in diameter as they extend
toward the rear of the retort, to aid in reducing their carrying capacity.
We will now describe the manuer of supporting and journalling the screw-conveyor,
reference being had particularly to Figures 2, 9, 13, 15 and 16. Suitably secured
upon the front of the conduit D, is a plate or bearing piece c (Figure 13) in which
is a vertical socket to receive a pair of washers or bearing rings d, (Figures 15 and 16)
having their adjacent faces annularly grooved to receive and retain bearing balls e
preferably of chilled steel; and fitted upon the shaft f of the screw conveyor, so as to
turn therewith, is a shouldered sleeve g, the enlarged part of which is journalled in
and has its bearing in the rear wall of the plate c, and the smaller part of which
extends through the bores of the ring d and is journalled in the front wall of the
plate c. It will thus be seen that the shoulder of the collar g bears against the inner
ring and the entire end thrust of the screw-conveyor is borne by the balls, the con-
struction forming a very perfect ball-bearing to receive the end thrust in the wall of
the conduit. D, Figures 1 and 9. At the rear end of the conduit is a semicircular
recess in which is removably secured by means of bolts h a bearing plate i, whose
inner side conforms to the curvature of the conduit and against which the flights of
the conveyor bear at that particular point, thus serving to hold the conveyor down to
its work and to a large extent relieving the bearings in the plate c.
To actuate the screw-conveyor to feed the coal from the hopper E through the
conduit D into the retort or magazine C, we employ the following mechanism,
particular reference being had to Figures 12, 13, 14 and 17: Fast on the shaft fin
front of the bearing plate e is a ratchet wheel 1, with its hub extended on both sides,
on which hub is journalled a two-part sleeve k, each of which parts has secured. to it
an upwardly extending arm and a downwardly extending arm m. Between the
arms m is pivoted a double dog n (see Figure 17) with two engaging noses o p and
with two pivotal bearings q, r preferably connected by a slot 8, so that the dog may
he instantly shifted from the pin carried by the arms f to cause either the bearing q
or the bearings to engage the ratchet j. For instance, the dog carrier composed of 5
the parts km has a constantly vibrating or reciprocating motion imparted to it by
any suitable means-in this instance by a well known form of steam motor G, whose

page_text: piston is connected by pivoted links t to the upwardly extending arms; and when
the nose o engages the ratchet with the bearing 9 on the pin of the arms m, as in
Figure 12, the ratchet together with the screw-conveyor will be turned in such
direction as to feed the coal into the retort, but when the dog is shifted to cause the
nose p to engage the ratchet with the bearing on the pin, the vibration of the dog
carrier will cause an opposite direction of rotation of the ratchet and screw conveyor
which would feed the coal from the retort back into the hopper. This backward
rotation of the screw-conveyor is sometimes important both to relieve temporary
clogging and when it is desired to empty the retort entirely. To ensure the proper
working of the ratchet wheel and screw-conveyor so that they may turn continuously
and intermittently in one direction we employ a stop dog u, Figure 12, preferably in.
two parts of unequal lengths and pivoted by a removable pin in a lug v vertically
adjustable on the inner wall of the case surrounding the ratchet. As seen in
Figure 12 there are two of these lugs on each side of the ratchet and when the
nose o is in engagement with the ratchet, the two-part dog u is on the left; but when
the dog n is shifted to bring its nose p into engagement, the two-part dog is like-
wise shifted to engage the lug v on the right. By these means very nice and perfect
adjustments can be made to insure the constant intermittent rotation of the screw-
conveyor, as will be readily understood.
We will now describe the air blast mechanism for supplying the requisite amount
of oxygen to the fuel at or about its zone of combustion, particular reference being
had to the figures on Sheets 1, 2 and 3. Surrounding the magazine C, and some
little distance from it, is a jacket or casing H, to form a wind box entering which and
under the conduit D is an air trunk I, connected to any suitable blast apparatus, the
force of the blast being regulated by a gate or valve J (Figures 1 and 3) pivoted as
at a¹ and controlled by a lever a² with an operating handle a³ having a rack engaging
a fixed latch piece in this instance on the side of the casing surrounding the
ratchet wheel j. The trunk I and box H form part of the conduit from the blower to
the tuyere openings. The top of the magazine C and the top of the bracket jacket H
are connected by a horizontal flange 61 which, as seen in Figure 4, may be an
extension of the magazine C; or, as seen in Figure 6, may be an extension of the
jacket H, suitable bolts 62 being provided to unite them at their point of juncture.
The horizontal flange b' is perforated with openings 63 (see particularly Figures 2
and 5) and there is seated on the flange tuyere blocks c¹ which extend upwardly from
the flange so that their inner faces form a substantial continuation of the sides of the
retort, though preferably at a slightly different angle, as shown in Figure 4. These
tuyere blocks are hollow, their lower openings registering with the openings 63 in
the flanges b¹, and are provided on their inner faces with suitable outlet openings.c²
and on their outer faces along the sides of the magazine and just above the grate
level or floor of the fire chamber with other outlet openings c³ (see Figure 4). These
blocks are arranged entirely around the top of the magazine with their ends abutting
to form a continuous wall or wall extension around the top of the magazine. Each
of the tuyere blocks is provided with a downwardly projecting flange ct adapted to fit
into one of the openings 6, the sides of the flange and the opening being preferably
correspondingly tapered so as to form a close joint to hold the tuyere blocks snugly
in position. To secure the tuyere blocks upon the flange and also to permit of
their ready removal for repair, replacement or otherwise, we provide in both ends of
each tuyere block near its bottom a recessed opening c having a countersunk
portion to receive one end of a T headed bolt c', which projects downwardly at an
angle through the flange b¹ and through suitable lugs d'and is held by a nut on its
threaded end. The countersunk portion of the recessed openings c is provided
with a depressed seat c³ adapted to receive the projecting ends of the head of the
bolt c when the same is turned in line with the sides of the magazine.
The con-
struction is such that by loosening the nuts on the bolts and turning them on their
axes until the T-heads stand at right angles to the sides of the magazine, the tuyere
block may be raised and removed from the flange or may be replaced thereon as

page_text: desired; and by having the bolts extend at an angle through the sides of the air
jacket beneath the grate surface they may be readily gotten at.
In order to distribute or deflect the air to one side or the other of the magazine we
place in the trunk I, a deflector K, which stands vertical in the trunk and is pivoted
therein so as to be moved at different angles; and as a convenient means of operating
said deflector its pivot projecting through the trunk is provided with an arm k¹
connected by a pivoted link k² to an operating lever pivoted to the side of the
trunk, as shown in Figure 3.
Secured within the wind box, preferably to the under side of the magazine, is
another stationary deflector L. (Figure 1) to aid in the proper distribution of the air
to the tuyeres.
The fuel conduit D is provided on its upper side adjacent to the magazine with ai
pocket el having curved or inclined sides (see Figures 1, 2, 7 8, 9, 10, 11) and to this
pocket air is supplied by means of a suitable pipe e², which leads around the conduit
and communicates with the air trunk ; a suitable deflector e³ being placed at one
side of the opening to deflect the air into the pipe so that a quantity of air is.
discharged into the conduit in the direction of the feed of the fuel to prevent smoke
or gases finding their way back through the conduit and fuel hopper.
As the retort or magazine C may be subjected to strains liable to crack or break it,
either from expansion, contraction or otherwise, we provide it with one or more
transverse sets of adjacent lugs m¹ and between which the inetal of the bottom and
sides of the magazine is made thinner than the rest of the body of the magazine. In
this instance I have shown two sets of such lugs which have bolts passed through
them, though not tightened up, forming bridges across the lines of diminished
resistance, and should any breaking strain occur to the retort it would break or crack
between said lugs and the bolts could then be tightened up to hold the parts securely
together, without necessitating the removal of the retort and its replacement by a
new one, as will be readily understood.
As seen in Figure 13, all that part of the motor mechanism in front of the hopper E,
is enclosed by a suitable casing N preferably constructed with removable sections to
give access to the same. Fitted upon the front end of the shaft is a cap m², visible
through a circular opening in the front of the case N, and carrying, some distance
from its centre, a piece n² projecting through the opening in the case, which piece is
preferably a grease cup communicating with the bearings within the case and thus
serving the double purpose of a lubricator and an indicator to enable the attendant
at all times to see at a glance that the screw-conveyor is properly rotated and also in
which direction it is rotated.
It will be seen that from the above description that we provide a stoker in which
the parts are simple and compact, with a self contained motor driving mechanism.
The constructions are such that all parts liable to require repairs are easily and readily
accessible. By having the air chamber completely surrounding the magazine and
communicating directly with an air trunk which partially surrounds the conveyor,
the incoming air prevents the overheating of the conduit or magazine and at the
same time the cooling of the magazine and conduit tends to slightly heat the air
which is introduced through the tuyeres, thus producing a desirable effect, both from
the standpoint of economy of combustion as well as economy of construction.
In the forges illustrated in Figures 18 to 29, we prefer-to use an underfeed stoker
having the various features of improvement above described., but any underfeed-stoker
may be employed-in which the coal or other fuel is fed continuously into the
magazine-from-below, which-magazine-is provided with passages at its upper-edge.
for the-delivery-of-air or air and steam-at-or-near-the-point-of-combustion.
14 are the outside walls of the furnace preferably made of an external metal
sheathing and a lining of fire bricks in the ordinary way. 15 is a door. 16 is an
air-duct conveying air to the chamber 17. A branch 18 extends to the joint around
the door and also to an air passage 19 above. 20 is the fire chamber of the furnace.
21 is a magazine and 22 are tuyere blocks having perforations 23 at or near the upper.
edge of the reservoir, through which air passes from the air chamber 17. 24 is a

page_text: screw conveyor by means of which coal is fed forward from the hopper 25 into the
magazine 21 and up through the same, overflowing onto the grate bars or floor 26 of
the furnace. 27 is a passage communicating between the air reservoir 17 and the
forward end of the magazine, to prevent a back draft of smoke or gases into the
hopper 25. 28 is a heating chamber above the fire chamber 20 and communicating
therewith through the passage 29. The heating chamber 28 has an exit 29ª and.
an opening 30 through which bars of metal, or other materials to be heated, are
introduced.
The screw conveyor 24 has on its forward end a ratchet wheel 31 shown in detail
in Figures 22 and 23. 32 is a suitable case for the ratchet wheel. 33 is a detent.
34 is a weighted dog carried on a pivoted arm 35, by means of which the ratchet
wheel is actuated. 36 is a rod connected by a ball joint 37 with the pivoted arm 35.
For the purpose of translating a constant motion of the rod 36 into a variable feed, we
have shown a device consisting of a spirally grooved prolongation 38 rigidly attached
to the rod 36 and a pin 39 rigidly attached to the ball joint 37, the latter being
inserted within the former. 40 is a sleeve having a flange at its lower end engaging:
with a shoulder on the lower end of the pin 39. 41 is a screw pin penetrating
the wall of the sleeve 40 and engaging with the spiral groove 42 within which
it finds seats 43. In the position in Figure 22, when the screw pin is in its top
seat there will be no lost motion and the movement of the ball 37 will correspond.
with the movement of the rod 36. When, however, it is in other and lower seats
there will be a lost motion between the rod 36 and the extension of the ball joint. so>
that the ball will participate in only a portion of the motion of the rod.
In this way
a uniform motion of the rod 36 is translated into a variable motion of the pivoted
arm 35 and hence a variable feed. Figure 25 is a development of the groove 42
above described.
44 is a binder or clamp supporting and holding together the bricks constituting a
part of the roof of the heating chamber. 103, Figure 21, 103ª, Figure 26 and 103,
Figure 29, are air passages discharging into the passages connecting the fire chambers
and heating chambers in the several figures. 104 is a gate controlling the passage of
air into the air passages 103 and 105 is a gate controlling the passage of air into the
air reservoir 17. 106 are handles for operating the last named gate.
In the modification shown in Figures 26 and 28, the passage 29" is at the front of
the furnace and there is an opening 30" extending from end to end but no opening at
the top.
In the modification shown in Figures 27 and 29, the passage 29 is at the centre.
100, 100 are deflectors which deflect the flame from the passages 30b into passages 101.
and protect the workman from heat radiation.
The operation of the device briefly described is as follows: Coal is fed by the screw
conveyor 24 from the hopper 25 into the magazine 21. Air under suitable pressure
enters through the duct 16 discharging the orifices 23. The volatile constituents of
green coal, as it is forced upward, are distilled and the gases combining with the air.
introduced through the orifices 23, are ignited; while, upon the floor of the furnace
and at the top of the bed, there is a glowing mass of incandescent coke. The products
of combustion passing upward through the passage 29 are mixed with an additional
supply of air issuing from the orifices 103 and they enter the heating chamber 29
which is above the fire chamber 20. In this upper chamber the heat is utilized, the
bars to be heated being introduced into the ends or sides of the chamber by means of
the passages 30. The air passages around the furnace door admit a constant flow of
air as shown in the drawings, the effect of which is to prevent gases being discharged
through the joint and to diminish the heat at this point.
The furnace is particularly adapted for the burning of the cheaper grades of soft
coal, although other fuel may be used, with complete combustion and without smoke.
By the use of the underfeed stoking device, uniform and unvarying temperature may
be maintained as well as the advantages of direct radiation from the constantly
exposed incandescent-bed of fuel. It also affords means for regulating the quality,
and intensity of the flame or heat produced in the heating chamber and for the most

page_text: advantageous treatment of different qualities of metal and for different uses. The
quality as well as the intensity of the heat produced is regulated by varying the
depth of the bed of fuel and by regulating the amount of air admitted through
the tuyere blocks and through the passage or passages which discharge into the passage
connecting the fire chamber with the heating chamber. It is well understood that
different qualities of coal or coal from different localities vary as to the quality, length
of flame and intensity of temperature developed under the same conditions. The use
of the underfeed stoking device with means for the introduction of air enables one to
obtain from different coals substantially the quality of flame intensity of temperature
desired for various requirements. The apparatus is, therefore, in this sense a flexible
one and of wide utility. Due to this flexibility the most economical consumption of
coals of various kinds can be attained without change in the construction of the
apparatus.
By the use of two chambers, one above the other, in the lower one of which the
incandescent body of coal is placed and in the upper one of which the heat is utilized
an opportunity is afforded for thoroughly mixing the gases and for the introduction
of air between the two which quickens and completes the combustion in the upper
chamber. It also furnishes a floor for the bars or billets being heated which is itself
heated by conduction as well as radiation; or, in other words, is heated on both
sides.
Furthermore, not only may the maximum heat be obtained and the greatest economy
of fuel consumption obtained but only waste and completely consumed gases are
discharged; hence, the exit may be in the workroom without connection with any
flue or chimney. Furthermore, when the connecting passage 29 is not in direct line
or direct communication with the exit, the sparks thrown off from the incandescent
coal are arrested in their passage toward the exit and the furnace is not only smoke-
less but it is also comparatively sparkless.
In-the--foregoing-specification--we have incidentally referred to some of the
modifientions-which-might-be-adopted-in the-practice-of our-invention, but we have
not-endeavoured to specify all the-modifications which might-be--employed; the
object-of-this-specification being to-instruct-persons-skilled-in-the art to practice the
invention-in-the form at present-preferred-by-us-and-to-enable them to understand
its-nature; and we-desire it to be distinctly understood-that-mention-by us of-a-few
modifications is-in-ne-way intended to exclude-others-not-referred-to but which are
within-the-spirit-and scope of-our-invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. In an underfeed stoker, the combination of a retort or magazine, fed by a
horizontal screw a series of tuyere openings on both sides, said openings being
directed across the magazine, a second series of tuyere openings above the floor of
the fire chamber directed away from the magazine, and a jacket surrounding the
lower part of the said magazine to conduct the air to and means for foreing--air
through said tuyere openings, substantially as described.
2. In-un-underfeed-stoker,-the-combination of a retort or-magazine, a series of
openings in the upper part of said-magazine-discharging toward the interior thereof
and-additional-openings-above-the-floor-of-the fire chamber directed-away from suid
magazine,--and--means--for-forcing air through said openings, substantially as
described.
2. 3. In an underfeed stoker, such as described in the first claim, the use of a the
combination of-a-retort or magazine, provided-with-a-series of tuyere openings at
or-near its top, a wind conduit communicating with the tuyere openings and a
deflector in said wind conduit, substantially as described.
4. In-an-underfeed stoker, the combination-of-a-retort-or-magazine,-provided-with
a-series-of-tnyere-openings-at-or-near-its-top-a-wind-conduit--communicating--with

page_text: the tnyere openings-and-an-adjustable-deflector in said wind conduit, substantially
as-described.
3. In-an-underfeed-stoker,-the-combination of a-retort or magazine, provided with
a-series-of-turere-openings nt-or-near-its-top-a-jacket-entirely surrounding said
a wind
magazine-to-form-a-wind-box-and-communicating-with-the-tayere-openings,
trunk-communicating-with-said-wind-box-and-a-deflector, substantially-as-described,
6. In-an underfeed stoker, the combination of a retort or magazine,--a-jacket
surrounding the-same-to-form-a-wind-box provided with openings and--a-series-of
turere blocks-seated-thereon and provided-with-openings communienting with the
openings in the wind box, substantially-as-described.
3. In an underfeed stoker, a fuel magazine having one or more sets of lugs
arranged transversely around the same with the metal of the body of the magazine
between the lugs made thinner to afford a line of fracture, and clamping bolts uniting.
said lugs, substantially as described.
3. In-an--underfeed--stoker, the--combination of-a-magazine having a conduit
leading into the same, tuyere blocks-arranged-at-the top of said-magazine-and
communicating with-said-conduit-and-an-air-trunk-partly-surrounding said-conduit
and communicating with said magazine, substantially-as-described.
9. In-na-underfeed stoker, the-combination-of-a-magazine, a jacket to-form-an-air
ehamber-around said-magazine, tuyere blocks-communicating-with-said-air-chamber
and belts adapted to engage in recessed-openings in the abutting-ends--of-said
tnyere-blocks, substantia!!-as described.
4. 10. In an underfeed stoker, the construction eombination of a the magazine,
with a laterally projecting flange therefrom, over the au air chamber surrounding said
magazine, tuyere blocks mounted thereon and bolts extending through said flange
and having heads adapted to engage oppositely arranged recessed openings in
adjacent ends of said tuyere blocks, substantially as described.
11. In-an-underfeed-stoker,-the-combination of an air chamber, a fuel-magazine;
an-air-trunk,-and-a-fuel conduit, quid air chamber-surrounding said-magazine-and
said-air-trunk-partly-surrounding-said-conduit,-of-a pocket in said conduit and--an
air-pipe-leading-from-said-air-trunk-to-said pocket, substantially-as-described.
5. In an underfeed stoker, the combination of a fuel magazine having an air
chamber completely surrounding the same, a laterally projecting flange connecting
the tops of both and adapted to form a top for said air chamber, with openings in
said flange having tapered sides, and tuyere blocks having correspondingly tapered
flanges to fit in said openings, said tuyere blocks being formed with openings on the
faces thereof, and adapted to fit together to form a continuous extension for the top
of said magazine, substantially as described.
13. In-an-underfeed-stoker, the ball bearing mechanism for the screw-conveyer
consisting of the-recessed-plate-c, annularly grooved rings d-in snid recess, balls-o
in-sid-grooves-between-the-rings, and-the-shouldered-sleeve-g-fast on the conveyer
chaft-and having a bearing-in suid-plate-c, cubstantially-as described:
14. In the-motor mechanism of an underfeed-stoker; the combination of a serew
conveyor,-a-ratchet for operating the came, a-vibrating dog carrier with means-for
vibrating the same;-and-a-double-nosed dog having two pivotal bearings connected
by-a-slot-pivoted to said-carrier and adapted to be shifted-so that either nose may
engage the ratchet to control the-direction-of-revolution-of the--serew conveyor,
substantially-as-described.
15. In the-moter-mechanism-of-an-underfeed-stoker, the combination-of-a-serew
conveyer,-n-ratchet-for-operating the same,-a-vibrating dog carrier with-means-for
vibrating the same,-a-double-nosed-dog-having two-pivotal bearings connected by-n
slot pivoted-to-said-carrier-and-adapted-to-be-shifted-so that either nose may engage
the-ratchet-to-control the direction-of-revolution-of-the-serew conveyor, and a stop
dog-for-suid ratchet adapted to be shifted to either-side thereof, cubstantially as
described.
16. In the motor-mechanism-of-an-underfeed stoker, the combination of a serew
conveyor,-a-ratchet for operating-the-same, a-vibrating dog carrier with-means-for

page_text: vibrating the same, a-double-nosed dog pivoted to said carrier and adapted to be
shifted--so-that--either-nose may-engage-the-ratchet-to-control-the-direction-of
revolution-of-the-serew conveyor, and-a-two-part-stop-dog, of unequal-lengths--for
said ratchet-adapted to be-shifted to either side thereof, substantially as described.
17. In-the-motor-mechanism-of-an-underfeed-stoker-the-combination of a-screw
conveyor, mechanism for-actuating the same, a ensing for said mechanism-provided
with an opening in front and an eccentrically set indicator revolving with the
conveyor shaft-adjacent to the opening in the easing, whereby the attendant can
observe the rotation of the screw conveyor,-substantially-as-described.
18 In-the-motor-mechanism-of-an-underfeed stoker, the-combination-of the-serew
conveyor-ratchet-j-and-its-vibrating-dog-carrier-k-of the double-nosed-dog-n-having
two-pivotal-bearings-7-7-connected by-a-slot-s, substantially-as-described.
10. In-an-underfeed stoker, the-combination of a fuel magazine, a fuel conduit
leading therefrom, a fuel-hopper-for-said-conduit, and a screw conveyor in said
eonduit-end-magazine-and-journalled through the front wall-of-said-conduit and
having a removable-bearing-plate within the conduit-at-its-rear-end, substantially-as
described.
20. In-an-underfeed-stoker,-a-fuel-magazine-having one-or more-portions-of-less
thickness than the-body-thereof combined with a bridge-or-bridges-spanning the
same, whereby the parts are held together in case of fracture, substantially-as
described.
21. In-n-forge, the-combination with a bed of fuel-fed-from-underneath with a
plurality-of-chambers-superimposed-through-which-the products of combustion-pass
on-their-way-to-the-exit, substantially as-described.
22. In-a-forge, the combination with a bed of fuel-fed-from-underneath--with a
plurality of chambers-superimposed,-a-passage-connecting said-chambers, means for
introducing and mingling with the products of combustion oxygen as they pass
through-caid-passage on-their-way-to-the-exit, substantially-as-described.
23. In-n-forge, the--combination with a bed of fuel fed from underneath, of
a plurality of chambers-superimposed, a passage-connecting said chambers-a-hood
or wall-over-said-passage-and-means-for-introducing and mingling with the products
of combustion oxygen-as-they-pass-through-said-passage on their way to the-exit,
substantially as described.
24. In-a-furnace, the combination with the door-of-one-or-more-air-passages
discharging-air through-the-joint-about the door and means-for-supplying thereto
air-at-a-pressure-higher than the pressure in the furnace, substantially as-described.
6. 25. In a variable feed mechanism, for underfed stokers the combination of two
rods movable with respect to one another, a connecting part engaging with both
of them and means for varying the position of one of them with respect to said
connecting part by which the amount of lost motion between the two parts is varied,
substantially as described.
Dated the 0th
Ann man 1000
WHITE & WOODINGTON,
Rooms 221-225, Birkbeck Bank Chambers,
Southampton Buildings, London, Agents.