Improvements in Furnaces for Steam Generators.
Year: 1898

page_text: Date of Application, 29th Sept., 1898-Accepted, 29th July, 1899
COMPLETE SPECIFICATION.
Improvements in Furnaces for Steam Generators.
I, BENJAMIN WHITEHEAD TUCKER, of $10, Broad Street, Newark, Essex County,
New Jersey, 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 and accompanying
drawings:-
:-
The invention relates to improvements in furnaces for steam generators, and
consists in the novel features of construction and combinations of parts herein-
after described and particularly pointed out in the claims.
In the accompanying drawings, I illustrate a furnace embodying the various
features and combinations of my invention and said furnace comprises a revoluble
grate frame with means for imparting motion to the same, ball bearing on which
said grate frame is mounted, and has its axial revoluble motion; a series of
radiating sectors mounted in an inclined position upon the upper annular edges
of said grate frames and forming the grate bars, said sectors being composed in
part of movable portions whereby the coal thereon may be agitated during the
revoluble motion of the grate; means for actuating the movable portions of the
aforesaid sectors; means for moving inward the ridge of coals which have a ten-
dency to accumulate upon the upper outer portion of said sectors, and means for
automatically stoking the furnace.
The features of the furnace are new as to their construction and operation,
and the various combinations of said features hereinafter claimed are new; and
it is desired to be understood that the claims of this application are not limited
to details in form, except in such instances as said claims are by their terms
purposely so limited.
-
The invention will be fully understood from the detailed description herein-
after presented, reference being had to the accompanying drawings, in which:-
Fig. 1 is. a central vertical longitudinal section partly broken away, through
a furnace constructed in accordance with and embodying the invention, the
revoluble grate frame being shown in side elevation.
Fig. 2 is a face view of a cam forming one of the details of the operative
mechanism and hereinafter referred to;
Fig. 3 is an enlarged central vertical section, partly broken away, of the front
portion of the furnace embodying the invention.
Fig. 4 is a horizontal section, partly broken away, of the furnace, on the
dotted line 44 of Fig. 1, the various sectors constituting the grate bars proper
being indicated by the dotted radial lines.
Fig. 5 is a front elevation, partly broken away, of a furnace embodying the
invention.
Fig. 6 is an enlarged top view of one of the sectors constituting the grate
bars proper of the furnace.
Fig. is an enlarged detached top view of one side bar of one of the said
sectors.
Fig. 8 is a side elevation of same.
Fig. 9 is an enlarged detached vertical section through an adjustable eccentric
•

page_text: mechanism on the driving shaft for operating and regulating the throw of the
stoking, shovel.
>
.
Fig. 10 is a side elevation of same, the shaft being in section on the dotted
line 10-10. of Fig. 9.
Fig. 11 is an enlarged detached side elevation of one of the movable or rock-
ing portions of the said sectors said rocking portions substantially, corresponding
with one another but as indicated in Fig. 6 being in rows and varying somewhat
in size.
Figs. 12, 13, 14, 15, and 16 are detached sectional views on the dotted
line 10-10 of Fig. 9 of the several movable or rocking portions of each of the
said sectors; and
Fig.17 is a detached plan of the connecting bar to which the group of segments
of each of the sectors are secured.
In the drawings A designates the masonry, for the furnace; B the combustion
chamber, and C the asli pit, the latter being furnished with a spiral conveyor D
for the automatic removal of the ashes. Within the combustion chamber B is
mounted a revoluble frame E having open sides and provided at its upper edge
with the annular frame F upon which is formed the series of teeth G for engage-
ment with the pinion wheel H by which said frame has imparted to it an axial
revoluble motion, as hereinafter described. The frame E has at its lower annular
edges the ring I formed with the inverted annular grooves or sockets J, J to
receive the balls K, which are freely arranged within said annular inverted
grooves or sockets J and bear upon the downwardly diverting upper. faces of the
ring L, the latter forming a tramway for and supporting the frame E. The
frame having the ring I of the nature shown and described and combined
with the ring L having the downwardly diverging upper surfaces and forming
a tramway and support for the frame E constitutes one of the combinations
sought to be protected herein.
-
The downwardly diverging upper surfaces of the ring or tramway L and the
form of the ring E constitute desirable surfaces for the balls K and are of a con-
struction which prevents the clogging up of the ball bearings by ashes or dust.
The annular frame-F is composed of sections which are secured together by
the bolts M, and the open sides of the frame E are formed of sections a secured
at their lower ends to the ring I by means of the bolts N and at their upper
ends to the frame F to support the latter and also the series of sectors, each
lettered O, which constitute the grate bars proper and are arranged on radial
lines and converge downward and inward as clearly indicated in Figs. 1 and 4.
The sectors travel with the frames E, F, and receive the fuel from the hopper I',
said fuel being automatically delivered to the sectors by means of a blade or
shovel Q, which is adapted to have a reciprocating motion imparted to. by the
means hereinafter described. The sectors all correspond with one another and
each is of the construction more clearly illustrated in Figs. 6, 7, 8, and 11 to 16
inclusive, in which it will be seen that each sector comprises the rigid bars R R,
and the series or groups of rocking segments S, the latter being keyed upon
or secured to short shafts which are mounted in the side bars RR, said shafts
being capable of axial motion within said segments S whose substantially cen-
tral apertures receive said shafts and are polygonal in outline, as illustrated in
Figs. 10 to 16 inclusive.
The groups of segments S located between the side bars R of each sector ()
vary in dimensions in accordance with their position, and hence, in Figs. 11
to 16 inclusive, I illustrate one segment S of each of the several groups of seg-
ments. The side bars substantially correspond with one another and each is
formed with the series of toothed segmental sections T, the bearing lug V and
the apertures W, the latter being substantially centrally arranged within Baid
sections T and adapted to receive the short shafts upon which the segments S
are secured.
The teeth of the segments T of the side bars R and also the teeth of the seg-

page_text: ments S not only cross the upper transverse surfaces of said sections T and seg-
ments S but extend downward for a definite distance along the sides of said
sections T and segments S, whereby vertical spaces between said teeth are formed
for the upward passage of the air necessary to the upper combustion of the fuel
upon the sectors O.
It is desired that the spaces between the bars R R of the sectors O shall be as
nearly as proper completely filled with the supporting surfaces for the fuel,
and hence, as shown in Figs. 6 and 7, the teeth of the sections T of said side
bars extend inward varying distances to approach as nearly as may be proper
the sides of the rocking segments S. The series of sectors O form, as denoted
in Fig. 4, a complete annular grate bar surface to receive the fuel and support
the same during combustion. The sectors 0 are in their relation to one another
indicated more clearly by the dotted radial lines in Fig. 4, which lines are used
to prevent confusing the fig. and for the reason that said sectors all correspond
with one another, and are shown in full in Figs. 6, 7, 8 and 11 to 16 inclusive.
The side bars R R of each sector 0 are secured together and are substantially
rigid with, though detachable from the revoluble frame E supporting them.
The upper outer ends of the side bars R R of each sector 0 are connected
together as clearly shown in Fig. 6, by means of the plate X, and said side bars
at the lugs V engage the upper edges of the annular frame F constituting the
upper portion of the revoluble frame E.
The groups of segments S located between the side bars R R are not, however,
rigid on, although they travel with the frame E. The segments S (with the
exception of the two side segments of the upper group of segments) are formed
with the lugs b, shown more clearly in Figs. 11, 12, 14, 15, and 16, which lugs
are apertures and are by means of pins secured to the bars d, shown in Figs. 1, 3
and 17, which extend lengthwise of and below the said sectors and connect
the said segments $ from one end to the other of the sectors 0, and in the opera--
tion of the furnace the said bars d are given a reciprocating motion so as to
rock the segments S for the purpose of agitating the fuel resting upon the said
segments. The connecting bar d is shown on a large scale in Fig. 17. The
lug of the middle one (shown in Fig. 11) of the uppermost row of segments S
is inserted into the bearing slot h¹ of the bar d and is there secured on its pin
which passes through said lug and the sides of the said bar, while the two side
segments S of the said uppermost row of segments have no lugs b (see Fig. 13)
but are rigid on the shaft holding said row of segments between the bars R R.
All of the segments S below the upper row or group of segments have lugs b,
and the lugs of the two pairs of segments S forming the second and third
groups or rows from the top are placed at opposite sides of the hubs (Fig. 17)
and the lugs 6 of the two lower segments S are placed in the slots of the said.
connecting bar d. The bars d are each provided with the lug e, the latter being
adjacent to the upper ends of said bars d and in position to be acted upon first
by the upper end of the arm f to move said bars d in one direction and then by
the plate or flange g to move said bars in the opposite direction whereby the
arm upon moving the bars d upward is enabled to rock all of the segments S
inward and downward toward the centre of the furnace, and thereafter the said
plate or flange g by moving said bars & downward is enabled to rock all of said
segments upward and outward and thereby restore them to their normal position.
The middle portions of the upper surfaces of the segments are preferably flat,
corresponding with the segmental sections T of the side bars R, and hence upon
the rocking of the said segments S, said segments are enabled to thoroughly
break up the bed of fuel resting upon them and prevent clinkering and other
objectionable conditions. The arm and flange 9 for acting upon the bars d
connected with the segments S, and the mechanism for adjusting said arm f will
be fully described hereinafter. The segments S are carried wholly by the said
bars R of the sectors 0. The greater length of the sectors O is preferably within
the outline of the frame F and the inner portions of the side bars R of said

page_text: sectors, 'as more clearly indicated in Figs. 1 and 3, rest upon a suitable ring h
which affords support for the inner ends of all the sectors O. The sectors O
constitute the grate bars proper and they constitute a novel feature of the inven-
tion sought to be protected hereby. Centrally within the frame E and below
the lower ends of the sectors 0 is the stationary, vertical cylindrical grate or
cage which is preferably composed of sections, for convenience, and is rigidly
seated within the central portion of the furnace and above the ash pit, and has
its upper edges below the ring which supports the lower ends of the sectors ().
The vertical cylindrical cage or grate i may be of any convenient form and con-
struction and may be secured in place in any suitable manner.
The edges of the ring ½ have an overhanging flange, the said ring his sup-
ported upon the cast brackets j which are secured by bolts or screws k to the
several sections a composing the frame E, and said brackets ; extend radially
inward along their upper portions through recesses formed in the outer flange
or depending edges of said ring hand are provided with the lugs m which press
against the outer edges of the said ring hand serve to retain the same in place.
The brackets all correspond with one another and radiate inward from the
sections a of the frame E.
The mechanism for stoking the furnace, operating the segments S of the see-
tor's O, breaking down the bridge of fuel which has a tendency to accummulate
upon the sectors Q, revolving the grate frame E and operating the conveyor D
are more clearly illustrated in Figs. 1, 3, 4, and 5, and said parts receive their
motion from a power shaft n shown in Fig. 5, and which may be actuated by
any suitable means. The shaft n may be continuous along the front of several
furnaces and thus be made to supply the power necessary for the care of a bat-
tery of furnaces, or said shaft may be confined to one furnace. The front of
the furnace is also provided with the auxiliary shaft o, which receives its rocking
motion from the main driving shaft and is connected by lever arms p P,
and links with the reciprocating blade or shovel Q by which the furnace is
automatically stoked with fuel descending through the hopper P. The inner
end of the shovel Q rests upon the ring or plate a located above the sectors (),
and the said shovel Q is, from the shaft o, given a reciprocating motion for the
purpose of moving the fuel inward into a position in which it may fall upon the
sectors as said sectors are revolved toward the front of the furnace by the
means hereinafter described. The shaft o has no other operative function in
the present instance than that of actuating the shovel Q, and said shaft o receives
its power from the shaft n through the medium of an eccentric y secured upon
the shaft and engaging the fork or frame straddling the said eccentric y
and secured by a sleeve A¹ upon the shaft o.
The movement of the fork or frame is created wholly by the eccentric y and said
fork or frame z is given a rocking motion and imparts such motion to the shaft o
which in turn, through the lever arms p, and links w, effects the sliding move-
ment of the shovel Q. The fork or frame z may be varied in position with rela-
tion to the eccentric y by the adjustment of the said eccentric on its hub a',
and hence the degree of motion the eccentric y shall impart to the fork or strap z
and through said fork to the shaft o may be regulated at will, in order that the
feeding of the fuel by means of the plate or shovel Q may be regulated to meet
all conditions. The adjustment of the relation between the fork or frame z and
the eccentric y may be such that the shaft will impart no motion whatever to
the shaft o and may also, be such that any degree of motion, from the minimum
to the maximum, may be imparted from the shaft n to the shaft o and thus the
motion of the shovel; Q may be absolutely controlled.
The means by which the, eccentric y may be adjusted to alter the throw of the
fork or frame z and consequently the action of the shovel Q is more clearly illus-
trated in Figs. 9 and 10 in which it. will be observed that the eccentric y is in
the nature of a band or strap.arranged upon the eccentric hub a being thereon
retained by means of a plate and the flange which is integral with said

page_text: hub a¹. The hub a¹ is keyed upon the driving shaft n and the fork or frame 2"
straddles the eccentric y. The flange c' of the said hub a' is provided with the series'
of apertures d'adapted to receive the end of the pin el carried by said eccentric,
and having an outward tension imparted to it by the spring fr
The pin el is provided with a suitable head g¹ by which it may be conveniently
operated. The purpose of the pin el and the aperture d' is to permit of the
adjustment of the eccentric y upon the fork or frame z around the hub a' in
order that the action of the eccentric y upon the fork or frame z may be regu-
lated at will, whereby the throw of the said fork or frame z is brought under
the absolute control of the attendant, and the action of the shovel Q may be
regulated in accordance with the condition of the fire in the furnace, the character
of the fuel employed and any other circumstances that may arise. By moving
the eccentric y on the hub a to one extreme of its movement the shovel Q may
be brought to a standstill and thus the shaft n'may continue to revolve and
operate the grate frame E while the shovel Q remains at rest. The point of
the pin el is adapted to enter any of the apertures d' of the flange c¹ and serves
to lock the eccentric y in any of its adjusted positions. The spring f¹ retains
the point of the pin within the proper aperture d' by means of the head g¹.
Upon the shaft o is loosely mounted by means of the sleeve C¹ the 'lever D¹;
whose lower end is engaged by the cam E and whose upper end is by means 'of
the links F connected with the plate or blade G¹ as clearly illustrated in Figs. 1
is mounted upon and revolved with the driving shaft n, and said cam E¹ oper-
and 5. The cam El is shown in detail in Fig. 2, and, as illustrated in Fig. 5,
is mounted upon and revolved with the driving shaft n, and said cam El oper-
ates through the lever D to reciprocate the plate or blade Gthe latter owing
to the form of the cam E¹ having a quick thrust inward and outward while the
projecting portion H¹ (Fig. 2) of said cam is engaging the roller carried on the
lower end of the lever D. The purpose of the blade G¹ is to break down the
bridge of fuel which has a tendency to accummulate upon the outer portions of
the sectors 0, and this result is accomplished merely by driving said plate or
blade G inward against the said bridge of fuel and causing the latter to descend'
downward upon the sectors 0. The shovel Q is of substantial width, as indicated
in Fig. 5, and at one corner is cut away sufficiently to admit of the motion of
the plate or blade G' along the upper surface of the ring a, as indicated in Fig. 1.
The shaft operate simply as a fulcrum for the lever D¹, which receives all of
its motion from the cam on the shaft n.
The shaft through the intermediate gearing I I" communicates its motion
to the shaft Jupon whose inner end, as shown in Figs. 1 and 3, is secured the
pinion wheel H, which meshes with the teeth G of the revoluble frame E, and
hence said shaft n through the medium of the shaft J operates the revoluble*
frame E the latter having a constant revoluble axial motion during all of the
time that the shaft J' is in motion. A suitable clutch K is provided by which
the power of the shaft n may be cut off from the gear I and shaft J whenever
desired, and hence when deemed proper the shaft J¹ may be allowed to remain
stationary and the revoluble frame E and the parts carried thereby caused to
cease their motion.
The shaft J is utilized through the medium of the sprocket wheels L' and
sprocket chain M, to actuate the conveyor D for removing the ashes and other
foreign matter from the ash pit C. Thus the power shaft actuates the shaft o,
to effect the reciprocation of the shovel Q for stoking the furnace, and the shaft n,
through the cam El operates the plate G¹ for the purpose of breaking down the
bridge of fuel likely to form upon the upper outward portions of the sectors O.
The said shaft n, also through the medium of the gearing II", is adapted to
effect the revolving motion of the grate frame E and the parts carried thereby
as well as the revolving motion of the conveyor D.
The means for setting the arms f for the purpose of regulating the extent
of throw the bars & shall impart to the segments S of the sectors O, is illustrated
:

page_text: in Figs. 3, 4, and 5, in which it will be seen that the arm f is mounted in the
bearings N and has its downwardly extending portion connected to the inner
end of the rod 0¹, which has upon its outer threaded end the internally threaded
adjusting sleeve Q', which is held within the bearing P and by which the rod Q¹
may be drawn outward from the surface or moved inward toward the furnace
for the purpose of adjusting the position of the arm f with relation to the lug e
on the bars d of the sectors 0. The arm f when adjusted remains rigid and has
no movement imparted to it. The lugs e on the bars d of the sectors 0 are
brought against the upper inclined end of the arm f by the revoluble action of
the frame E, and the said lugs upon meeting the upper end of the arm f are
by the said arm forced outwards towards the front of the furnace, as by the action
of a cam, and said bars d remain in this outward position until the lugs e thereof
during the continued revolution of the frame E have their outer edges brought
into contact with the plate or flange g, shown in Figs. 1 and 4 which plate or
flange is in an inclined position and operates as a cam to drive the lugs e and
bars d inward as said lugs are moved against the same by the revoluble action
of frame E.
Thus during the revoluble motion of the frame E the inner edges of the
lugs e of the sector bars d first ride against the upper inclined end of the arm f
and with the said bars d are forced outwards, thereby rocking the segments S
downward and inward, and immediately thereafter the continued revolving of
the frame E carries the outer edges of the lugs e on the sector bars d against
the inner edges of the flange or plate g, which effects the movement of the
sector bars d downward and inward and thereby causes the segments S to rock
upwards and outward to their former normal position in line with the side bars R R
of the sectors 0. The rocking motion of the segments S is thus automatically
effected by the arm f and flange or plate g and is in no way dependent upon the
driving shaft n.
The operation of the various parts and combinations of the furnace have been
sufficiently described herein before in connection with the explanation of the
construction of the said parts.
This application is not limited to the special revoluble frame E described and
shown, since said frame constitutes simply a convenient means for supporting
the sectors and facilitating their axial revolution in a body; nor is the inven-
tion confined to the ring h or brackets shown; nor is the invention shown to
any special cage or grate i over the ash pit; nor is the invention in all its parts
confined to the rocking segments S. The cage or grate i is allowed to remain
substantially full during the use of the furnace so as to prevent the coals on
the sectors from passing too freely to the ash pit. In the use of the furnace
the body of burning fuel extends over the sectors and cage i.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is
1) In a furnace, the central grate-frame, combined with the series of radiating
inclined sectors extending downward and inward to said grate frame and con-
stituting the grate bars proper, said sectors being in the form of bars having
along their upper surface the transverse teeth which extend down along a por-
tion of the sides of said bars, substantially as described and shown.
2) In a furnace, the central grate frame, combined with a series of radiating
inclined sectors extending downward and inward to said grate frame and con-
stituting the grate bars proper, said sectors being in the form of bars subdivided
into segmental sections and having along their upper surface the transverse
teeth which extend down along a portion of the sides of said bars; substantially
as described and shown.
3) In a furnace, the central grate frame, combined with the series of radiating

page_text: inclined sectors. extending downward and inward to said grate frames and con,
stituting the grate bars proper, the sectors comprising the toothed bars and seg-
ments, the latter being movable against the fuel; substantially as described
and illustrated.
4) In a furnace, the central grate frame, and the series of radiating inclined
sectors extending downward and inward to the said. grate and constituting the
grate bars proper, said sectors being in the form of bars having along their
upper surface the transverse teeth which extend down along a portion of the
sides of said bars combined with power mechanism for imparting to said sectors
as a body an axial revoluble motion; substantially as described and shown.
5) In a furnace, the central grate frame, and the series of radiating inclined
sectors extending downward and inward to said grate frame and constituting
the grate bars proper, said sectors each comprising the sides and movable seg-
ments, combined with means connecting together the segments of each sector,
and means for automatically rocking said segments, substantially as described
and shown.
6) In a furnace, the central grate frame, and the series of radiating inclined
sectors extending downward and inward to said grate frame and constituting
the grate bars proper, said sectors each comprising the sides and movable seg-
ments, combined with power mechanism for imparting to said sectors as a body
an axial revoluble motion, and means for automatically rocking said movable
segments as said segments pass a given point, substantially as described and
illustrated.
7) In a furnace, the central grate frame, and the series of radiating inclined
sectors extending downward and inward to said grate frame and constituting
the grate bars proper, said sectors each comprising the sides and movable seg-
ments, combined with power mechanism for imparting to said sectors an axial
revoluble motion, means for automatically rocking said movable segments as
said sectors pass a given point, and means for adjusting the throw of said seg-
ments, substantially as described and shown.
8) In a furnace, the series of radial inclined sectors constituting the grate
bars and comprising the groups of rocking segments, combined with means for
imparting to said segments a rocking motion, and power mechanism for impart-
ing to said sectors as a whole an axial revoluble motion, substantially as described
and shown.
9) In a furnace, the series of radial inclined sectors constituting the grate
bars and comprising the groups of rocking segments, combined with means for
imparting to said segments a rocking motion, power mechanism for imparting
to said sectors as a whole axial revoluble motion, and means for automatically
stoking the furnace from a given point, substantially as described and illustrated.
10) In a furnace, the series of radial inclined sectors constituting the grate
bars and comprising the groups of rocking segments, combined with means for
imparting to said segments a rocking motion, power mechanism for imparting
to said sectors as a whole an axial revoluble motion, means for automatically
stoking the furnace from a given point, and means for automatically breaking
down the bridge of fuel tending to form at the upper outer portion of said
sectors, substantially as described and illustrated.
11) In a furnace, the series of radial inclined sectors constituting the grate
bars and comprising the groups of rocking segments, combined with means for
imparting to said segments a rocking motion, power mechanism for imparting
to said sectors as a whole an axial revoluble motion, the hopper for fuel, and
power mechanism for operating said shovel to automatically stoke the furnace,
substantially as described and illustrated.
12) In a furnace, the series of radial inclined sectors, constituting the grate
bars and comprising the groups of rocking segments, combined with means for
imparting to said segments a rocking motion power mechanism for imparting
to said sectors as a whole an axial revoluble motion, the hopper for fuel, the

page_text: stoking shovel at the discharge at the end of said hopper, power mechanism for.
operating said shovel, to automatically stoke the furnace and means for varying
the throw of said shovel, substantially as described and. shown.
13) In a furnace, the central grate frame having the grooves along its lower
edge, power mechanism for imparting to said frame an axial revoluble motion,
and the sectional grate bars supported on said frame, combined with the tramway
below the edges of said, frame and having the downwardly diverging surfaces
below said grooves, and the balls confined within said grooves and bearing on
said surfaces, substantially as described and shown.
14) In a furnace, the central grate frame, grate bars radiating upwards and
outward from said frame, and the power shaft, combined with means intermediate
said frame and shaft for revolving the former from the latter, the hopper for
fuel, the shovel at the discharge end of the said hopper, means intermediate said
shovel and said shaft for operating the former from the latter, and means for
adjusting the throw of the said shovel, substantially as described and illustrated.
15) In a furnace, the central grate frame, grate bars radiating upward and
outward from said frame, and the power shaft, combined with means inter-
mediate said frame and shaft for revolving the former from the latter, the
hopper for fuel, the shovel at discharge end of the said hopper, the auxiliary or
rock shaft, means connecting said shovel and shaft for reciprocating the former
from the latter the forked frame connected with auxiliary shaft and engaging
said forked frame for actuating said auxiliary shaft and said shovel substantially
as described and shown.
16) In a furnace, the central grate.frame, grate bars radiating upward and
outward from said frame, and the power shaft, combined with means inter-
mediate said frames and shaft for revolving the former from the latter, the
hopper for fuel, the shovel at the discharge end of said hopper, the auxiliary
or rock shaft, means connecting said shovel and shaft for reciprocating the
former from the latter, the forked frame connected with said auxiliary shaft,
the hub on said driving shaft, and the eccentric strap encompassing and adjust-
able on said hub and engaging said forked frame for actuating said auxiliary
shaft and said shovel, substantially as described and shown.
17) In a furnace, the central grate frame, grate bars radiating upward and
outward from said frame, and the power shaft combined with means inter-
mediate said frame and shaft for revolving the former from the latter, the
hopper for fuel, the shovel at the discharge end of said hopper, the auxiliary or
rock shaft, means connecting said shovel and shaft for reciprocating the former
from the latter, the forked frame connected with said auxiliary shaft, the hub
on said driving shaft, the eccentric strap on said hub and engaging said forked
frame for actuating said auxiliary shaft and said shovel, the apertured plate at
the side of the said hub, and the pin carried by said eccentric strap for engaging
the apertures of said plate and securing said strap in its adjustments substan-
tially as described and shown.
18) In a furnace, a central grate frame grate bars radiating upward and out-
ward from said frame, and the power shaft, combined with means intermediate
said frame and shaft for revolving former with the latter, the hopper for fuel,
the shovel at the discharge end of the said hopper, means intermediate said shovel
and said shaft for operating the former from the latter, the independent blade
or plate for breaking down the bridge of fuel tending to form on the upper outer
portions of said grate bars, and means intermediate said independent blade or
plate and said shaft for operating the former from the latter, substantially as
described and illustrated.
19) In a furnace, the central grate frame, grate bars radiating upward and
outward from said frame, and the power shaft, combined with means inter-
mediate said frame and shaft for revolving the former from the latter the hopper
for fuel, the shovel at the discharge end of said hopper, means intermediate
said shovel and said shaft for operating the former from the latter, means for

page_text: stopping said shovel without stopping said shaft or said grate frame, and means
for stopping said grate frame without stopping said shaft or said shovel, sub-
stantially as described and shown.
20. In a furnace, the central frame, the series of radiating grate bar sectors
converging downward and inward to said frame and each comprising the sides
and rocking segments, and a connecting bar to move the same and said segments
in one direction, and a further projecting surface in the path of said connecting
bar to move the same and said segments in the opposite direction, substantially
as described and shown.
21) In a furnace, the central frame, the series of radiating grate bar sectors
converging downward and inward to said frame and cach comprising the sides
and rocking segments, and a connecting bar secured to said segments to rock
the same in unison combined with the arm in the path of said connecting bar
to move the same and said segments in one direction, means for adjusting the
position of said arm to regulate the movement of said bar and segments, and
the inclined plate also in the path of said bar to move the same and said segments
in the opposite direction, substantially as described and shown.
22) In a self-stoking furnace, the revoluble frame E comprising the base ring,
the side sections a, and the upper annular sectional frame I having the teeth G,
combined with gearing for revolving said frame, the series of radial downwardly
converging sector grate bars mounted upon said frame, and the cage or grate
located within said frames and below the inner edges of said sector grate bars,
substantially as described and illustrated.
23) In a self-stoking furnace, the revoluble frame E comprising the base ring,
the side sections and the upper annular sectional frame having the teeth G,
combined with the radial brackets secured to said sections a, the ring sup-
ported upon the converging ends of said brackets, gearing for revolving said
frame E, brackets j and ring h, the series of radial downwardly converging
sector grate bars mounted upon said frame, and the cage or grate located within
said frame and below the inner ends of said sector grate, bars, substantially as
described and shown.
25) The general arrangement construction and combination of parts com-
prising the improvements in furnaces for steam generators substantially as
described and illustrated.
Dated this on day or september 1995.
For the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents, 5, John Dalton Street, Manchester.