Year: 1894

page_text: being date of first Foreign Application (in
United States of Americ),
19th M 1., 1034
Date of Application (in United Kingdom), 16th Oct., 1894
Complete Specification Left, 16th July; 1895-Accepted, 12th Oct., 1895
Date of Application (in United Kingdom), 16th Oct., 1894
Complete Specification Left, 16th July; 1895-Accepted, 12th Oct., 1895
I, EDWIN CARTWRIGHT of 555 Potter Avenue, Milwaukee in the County of
Milwaukee in the State of Wisconsin United States of America, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention has relation to blast feeding apparatuses for furnaces.
The object of the invention is to provide a simple and inexpensive apparatus
for feeding a blast of steam, or steam and air, to a stove for the purpose of
thoroughly heating the blast preparatory to its passage from the stove to the
furnace.
The invention consists of the devices and parts, or their equivalents, as hereinafter
more fully described and claimed.
In the accompanying drawing, the figure represents, in vertical section, the stove,
said stove being broken away lengthwise, and also in vertical section the device
connected therewith for feeding the steam and commingled air into the stove.
Referring to the drawing, the numeral 1 indicates the stove which is connected
to the tuyere of the furnace by a pipe 2. This stove is of the ordinary construction,
and consists of an inner space 3 which communicates with the pipe 2, an annular
space 4 surrounding the inner space, and a second space 5 surrounding space 4, and
extending over and covering the top of space 3, said space 5 having communication
with space 4 through the lower opening 6.
Surmounting the top of the stove is a cupola 7 which is provided with an internal
centrally apertured plate 8, from which depends an annular valve seat 9. Passing
an arm 11 is
through an elongated slot 10 in the cupola, and pivoted medially on
a lever 12, said lever provided upon its outer end with a weight 13, and having its
inner end connected to a valve 14 through a link 15. The cupola, as shown in
the drawing, is in open communication with the outer space 5 of the stove.
Referring now particularly to the feeding mechanism, the numeral 16 iudicates
a casing, from which projects medially a pipe 17. To the upper end of the
casing 16 is secured a coupling 18 forming a chamber 19, from which chamber
projects a pipe 20, said pipe adapted to be coupled or secured to a pipe (not shown)
leading from a suitable source of steam supply. The top plate 21 has extending
upward therefrom standards 22, 22, which standards are connected by a cross
bar 23, said cross bar provided with a central screw threaded aperture, through
which a threaded valve stem 24 passes, said valve stem operated by a. hand
wheel 25 secured to its upper end. To the lower end of the valve stem is secured
a dome-shaped apertured valve 26, the lower end of which is adapted to rest upon
a valve seat 27 at the upper end of the casing 16. Within the upper portion of
0
11

page_text: the casing 16 is secured a plate 28, which passes through the top opening of said
casing, and is formed at its upper end into a dish shaped or concaved portion 29.
The valve 26 is provided with an interior shoulder 30, which, when the valve is
properly seated as shown in the drawing, rests upon the edge of the concave
portion 29. It is obvious that when steam enters the chamber 19 it will pass
through the apertures of the dome-shaped valve 26, and the pressure of the same
will be exerted against the concaved portion 29.
The numeral 31 indicates a lower cylinder, which cylinder is connected to the
lower end of the casing 16 by neaus of rods 32. The cylinder is in com-
munication with the blast furnace by means of a pipe 33. Within the cylinder
works a piston-head 34, the piston-stem 35 thereof passing through stuffing-
boxes 36 and 37 respectively, in the adjacent ends of the cylinder and casing.
Turning within the casing is a short shaft 38, said shaft provided with a crank 39
which is connected to the piston-stem 35 by means of a link 40. The shaft 38
extends laterally beyond the outside of the casing and connects with an arm 41,
said arm carrying on its outer end a weight 42. Within the casing 16, near the
upper end thereof, is a throttle valve 43, said valve mounted upon a shaft 44 which
extends laterally beyond the casing and is provided with an end crank 45, said
crank connected with the arm 41 by means of a link 46.
Coupled to the pipe 17 of the casing 16, or, if preferred, formed in one piece
therewith is a nozzle 47, the end of said nozzle surrounded by a chamber 48,
the end of said chamber, in turn, bolted to a coupling 49 projecting from the
cupola 7. The casing of the chamber 48 is provided medially with an upward
projecting extension 50, to which is bolted another casing, forming a supplemental
chamber 51, which is provided with an upper opening 52. An arm 53 projects
upward from the casing of the chamber 51, to which arm is pivoted a lever 54,
one end of said lever provided with a weight 55, and the opposite end passing
through an elongated slot in another arm 56, the extent of movement of this end
being limited by means of a block blocks, similar to 57, placed within the slot.
Adapted to work against the seat of the opening 52 of valve 51, is a valve 58,
the stem 59 of said valve passing through a guide 60, and connected medially to
the lever 54.
To thoroughly understand the application of my invention, it is necessary to
call attention to the fact that in connection with a blast furnace as ordinarily
constructed, a large bell is employed which encloses the furnace at the top, and
is used for the purpose of forcing the gas down a large tube into a channel or
chamber beneath the surface of the ground, which channel or chamber feeds a
lower opening similar to 61, shown in connection with the stove illustrated in the
accompanying drawing, said feed being accomplished by means of a stand-pipe,
which is connected up to the opening 61 whenever it is desired to feed the gas
to the stove 1, for the purpose of heating said stove. When it is desired to cut
off the feed of gas a slide valve is closed at the base of the stand-pipe. This
channel feeds the gas to the stove, and when said stove has become sufficiently
heated thereby, the gas is turned off, and the blast introduced.
In the operation of my invention, shown in the accompanying drawing steam is
allowed to pass into the chamber 19. The valve 26 is raised by means of the
hand-wheel 25, and the steam, of course, is free to pass to the nozzle 47 and to be
ejected forcibly therefrom for passage into the cupola 7 of the stove. As the
steam is thus ejected from the nozzle a vacuum is formed in the chamber 48, and
the moment this vacuum is formed the pressure of the external air ou the valve 58
will force said valve down away from its seat, against the action of the weight 55,
and allow the entrance of the air. The air thus entering the chamber 51 will be
drawn into chamber 58 by the suction of the steam, whereby the commingled steam
and air will enter the cupola. In thus entering the cupola, the blast acts to close
the valve 14, and thereby prevents the escape outward of said steam and air.
This valve 14 is normally open as shown in the drawing, for the purpose of
furnishing a draught for the escape of the heating gases while heating up the

page_text: While
stove. The associated steam and air pass through the opening of the cupola, and
enter the space 5. It circulates around said space, and then passes through the
opening 6 into the space 4, and from said latter space into the space 3.
thus circulating around in the passages of the stove, the associated steam and air
are thoroughly heated, and enter the furnace through the pipe 2 in this heated
condition. It is obvious that the passage of this hot steam and air into the
furnace has the effect of creating a most intense combustion. The commingling of
the air with the steam is not essential to successful results, but its use in connection
with the steam is preferable, inasmuch as a more rapid combustion is caused
thereby. When the pressure in the blast furnace becomes too great, it is of course
necessary that the amount of steam ejected from the nozzle should be diminished.
Therefore, I so arrange the piston head 34 in the cylinder 31 that when the
pressure in the furnace reaches a certain point, for instance, a pressure of eight
pounds, the piston head 34 will be elevated. As the piston head is elevated, the
piston-stem 35 thereof, through the intermediate connections, acts on the throttle
valve, so as to bring said valve toward a horizontal position, and thereby diminish
the supply of steam passing to the nozzle. When the pressure in the furnace is
reduced, the weight 42, of course, returns the piston head 34 to its normal position.
Dated this 15th day of October 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
Improvements in Blast Feeding Apparatus for Furnaces.
I, EDWIN CARTWRIGHT of 555 Potter Avenue, Milwaukee in the County of
Milwaukee, in the State of Wisconsin, 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 :-
My invention has relation to blast feeding apparatuses for furnaces.
The object of the invention is to provide a simple and inexpensive apparatus for
feeding a blast of steam, or steam and air, to a stove for the purpose of thoroughly
heating the blast preparatory to its passage from the stove to the furnace.
The invention consists of the devices and parts, or their equivalents, as hereinafter
more fully described and claimed.
In the drawing accompanying the Provisional Specification, the figure represents,
in vertical section, the stove, said stove being broken away lengthwise, and also in
vertical section the device connected therewith for feeding the steam and
commingled air into the stove.
Referring to the drawing, the numeral 1 indicates the stove which is connected
to the tuyère of the furnace by a pipe 2. This stove is of the ordinary construction,
and consists of an inner space 3 which communicates with the pipe 2, an annular
space 4 surrounding the inner space, and a second space 5 surrounding space 4, and
extending over and covering the top of space 3, said space 5 having cominunication
with space 4 through the lower opening 6.
ة
Surmounting the top of the stove is a cupola 7 which provided with an
internal centrally apertured plate 8, from which depends an annular valve seat 9.
Passing through an elongated slot 10 in the cupola, and pivoted medially on an
arm 11 is a lever 12, said lever provided upon its outer end with a weight 13, and
having its inner end connected to a valve 14 through a link 15. The cupola,
as shown in the drawing, is in open communication with the outer space 5 of
the stove.
Referring now particularly to the feeding mechanism, the numeral 16 indicates a

page_text: casing, from which projects medially a pipe 17. To the upper end of the casing 16
is secured a coupling 18 forming a chamber 19 from which chamber projects a
pipe 20, said pipe adapted to be coupled or secured to a pipe (not shown) leading
from a suitable source of steam supply. The top plate 21 has extending upward
therefrom standards 22, 22, which standards are connected by a cross bar 23, said
cross bar provided with a central screw threaded aperture, through which a threaded
valve stem 24 passes, said valve stem operated by a hand wheel 25 secured to its
upper end. To the lower end of the valve stem is secured a dome-shaped apertured
valve 26, the lower end of which is adapted to rest upon a valve seat 27 at the
upper end of the casing 16. Within the upper portion of the casing 16 is secured
a plate 28, which passes through the top opening of said casing, and is formed at
its upper end into a dish shaped or concaved portion 29. The valve 26 is provided
with an interior shoulder 30, which, when the valve is properly seated as shown in
the drawing, rests upon the edge of the concave portion 29. It is obvious that
when steam enters the chamber 19 it will pass through the apertures of the dome-
shaped valve 26, and the pressure of the same will be exerted against the
concaved portion 29. By raising the valve 26 from its seating 27 by means of
the hand wheel 25 steam is allowed ready access under the concave plate 29 into
the nozzle.
The object of the concave plate is to facilitate the raising of the valve by
the hand wheel. When the steam enters the chamber 19, it is necessary
that there should be some pressure beneath the valve 26, in order to permit of the
ready raising of the valve. If there were only steam pressure on the outside or
top of the valve, it is obvious that it would be very difficult to open the latter.
The perforations in the valve and the concave plate are therefore provided, so that
when the steam enters the chamber 19, and before the valve is raised, said steam
passes through the openings in the valve, and enters the space between the concave
plate and the under side of the valve. This of course produces pressure upon both
sides of the valve, and so equalizes the pressure thereon that said valve may be
readily raised.
The numeral 31 indicates a lower cylinder, which cylinder is connected to the
lower end of the casing 16 by means of rods 32. The cylinder is in communication
with the blast furnace by means of a pipe 33. Within the cylinder works a piston-
head 34, the piston-stem 35 thereof passing through stuffing-boxes 36 and 37
respectively, in the adjacent ends of the cylinder and casing. Turning within the
casing is a short shaft 38, said shaft provided with a crank 39 which is connected
to the piston-stem 35 by means of a link 40. The shaft 38 extends laterally beyond
the outside of the casing and connects with an armı 41, said arm carrying on its
outer end a weight 42. Within the casing 16, near the upper end thereof, is a
throttle valve 43, said valve mounted upon a shaft 44 which extends laterally
beyond the casing and is provided with an end crank 45, said crank connected with
the arm 41 by means of a link 46.
Coupled to the pipe 17 of the casing 16, or, if preferred, formed in one piece
therewith is a nozzle 47, the end of said nozzle surrounded by a chamber 48, the
end of said chamber, in turn, bolted to a coupling 49 projecting from the cupola 7.
The casing of the chamber 48 is provided medially with an upward projecting
extension 50, to which is bolted another casing, forming a supplemental chamber 51,
which is provided with an upper opening 52. An arm 53 projects upward from
the casing of the chamber 51, to which arm is pivoted a lever 54, one end of said
lever provided with a weight 55, and the opposite end passing through an elongated
slot in another arm 56, the extent of movement of this end being limited by means
of a block or blocks, similar to 57, placed within the slot. Adapted to work against
the seat of the opening 52 of valve 51, is a valve 58, the stem 59 of said valve
passing through a guide 60, and connected medially to the lever 54.
To thoroughly understand the application of my invention, it is necessary to
call attention to the fact that in connection with a blast furnace as ordinarily
constructed, a large bell is employed which encloses the furnace at the top, and is

page_text: used for the purpose of forcing the gas down a large tube into a channel or chamber
beneath the surface of the ground, which channel or chamber feeds a lower opening.
similar to 61, shown in connection with the stove 1 illustrated in the accompanying
drawing, said feed being accomplished by means of a stand-pipe, which is
connected up to the opening 61 whenever it is desired to feed the gas to the
stove 1, for the purpose of heating said stove. When it is desired to cut off the
feed of gas a slide valve is closed at the base of the stand-pipe. This channel
feeds the gas to the stove, and when said store has become sufficiently heated.
thereby, the gas is turned off, and the blast introduced.
In the operation of my invention, shown in the accompanying drawing, steam is
allowed to pass into the chamber 19. The valve 26 is raised by means of the hand-
wheel 25, and the steam, of course, is free to pass to the nozzle 47 and to be
ejected forcibly therefrom for passage into the cupola 7 of the stove. As the
steam is thus ejected from the nozzle a vacuum is formed in the chamber 48, and
the moment this vacuum is formed the pressure of the external air on the valve 58
will force said valve down away from its seat, against the action of the weight 55,
and allow the entrance of the air. The air thus entering the chamber 51 will
be drawn into the chamber 58 by the suction of the steam, whereby the
commingled steam and air will enter the cupola. In thus entering the cupola, the
blast acts to close the valve 14, and thereby prevents the escape outward of said.
steam and air. This valve 14 is normally open as shown in the drawing, for the
purpose of furnishing a draught for the escape of the heating gases while heating
up the stove. The associated steam and air pass through the opening of the
cupola, and enter the space 5. It circulates around said space, and then passes
through the opening 6 into the space 4, and from said latter space into the space 3.
While thus circulating around in the passages of the stove, the associated steam
and air are thoroughly heated, and enter the furnace through the pipe 2 in this
heated condition. It is obvious that the passage of this hot steam and air into
the furnace has the effect of creating a most intense combustion. The commingling
of the air with the steam is not essential to successful results, but its use in
connection with the steam is preferable, inasmuch as a more rapid combustion is
caused thereby. When the pressure in the blast furnace becomes too great, it is
of course necessary that the amount of steam ejected from the nozzle should be
diminished. Therefore, I so arrange the piston-head 34 in the cylinder 31 that
when the pressure in the furnace reaches a certain point, for instance, a pressure
of eight pounds, the piston-head 34 will be elerated. As the piston-hend is
clevated, the piston-stem 35 thereof, through the intermediate connections, acts
on the throttle valve, so as to bring said valve toward a horizontal position, and
thereby diminish the supply of steam passing to the nozzle. When the pressure
in the furnace is reduced, the weight 42, of course, returns the piston-head 34 to
its normal position.
Having new particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a blast feeding apparatus for furnaces, the combination, of a stove having
communication with a furnace, an ejector for ejecting steam into the stove,
whereby said steam is heated prior to its passage into the furnace, and means
controlled by the pressure within the furnace for regulating the amount of steam
supplied, substantially as set forth.
2. The combination, of a hot blast stove having communication with a furnace,
whereby gas is admitted to said stove for heating the same preparatory to forcing
a blast therethrough, a blast chamber having communication with the stove, said
communicating chamber provided with an air opening, a valve for said opening,
a steam ejecting nozzle entering the blast chamber, and adapted to force steam
5 into the stove after the stove has become sufficiently heated, and after the supply of
gas thereto has been cut off, and means for controlling the valve, whereby when a

page_text: blast of steam is discharged through the nozzle said valve will be opened for the
admission of air, substantially as set forth.
3. The combination of a hot blast stove having communication with a furnace,
whereby gas is admitted to said stove for heating the same preparatory to forcing
a blast therethrough, a blast chamber having communication with the stove, said
communicating chamber provided with an air opening, a medially pivoted lever
provided at one end with a weight, a valve for controlling the air opening, the
stem of said valve connected to the lever, and a steam ejecting nozzle entering
the blast chamber and extending across the valve opening thereof, and adapted,
after the stove has become sufficiently heated, and the supply of gas thereto cut
off, to discharge the steam, for passage into the stove, in advance of the air opening,
whereby a vacuum is formed back of the discharge, causing the air valve to be
opened by the pressure of the exterior air, substantially as set forth.
4. The combination of a stove, a blast casing having communication with the
stove and adapted to feed the blast thereto, a throttle valve within the casing, a
cylinder connected to the blast furnace by means of a pipe, and a piston-bead
working in the cylinder, the piston-stem thereof having connection with the throttle
valve, whereby when the piston-head is raised by the pressure in the furnace, the
throttle valve is turned, and the supply of steam regulated, substantially as set
forth.
5. The combination of a stove, a blast casing having communication with the
stove and adapted to feed the blast thereto, a cylinder connected to the blast
furnace by means of a pipe, a transverse crank shaft within the casing, a link
connecting the crank thereof to the stem of the piston-head, a weighted arm
connected to the outer end of the crank shaft, a transverse shaft carrying a
throttle valve, said shaft provided on its exterior end with a crank, and a link
connecting said crank with the weighted arm, substantially as set forth.
Dated this 15th day of July 1895.
WM. P. THOMPSON & Co.,
Liverpool, Manchester, Birmingham, and London, Patent Agents.