Improvements in Injectors.
Year: 1892

page_text: Date of Application, 20th Dec., 1892
Complete Specification Left, 12th Sept., 1893-4ccepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE SHERWOOD MANUFACTURING COMPANY,
of Buffalo, in the County of Erie and State of New York, United States of
America.]
Improvements in Injectors.
I HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex do hereby declare the nature
of this invention to be as follows:-
--
This invention relates to the overflow devices of injectors and has for its objects
to facilitate the opening of the overflow valves and to render the parts more readily
accessible.
The injector constructed according to my invention comprises a shell or casing ;
a primary steam chamber; a steam inlet; a secondary steam chamber a primary
The steni
water chamber a water inlet; a primary steam valve and its valve seat.
of the primary steam valve is secured at its front end to a yoke which slides upon a
stud and is actuated by a hand lever connected with the shell by a link.
The injector also comprises a primary steam nozzle, a primary combining tube,
and a delivery tube whereby the water is delivered from the primary water chamber
into the secondary water chamber.
The secondary steam nozzle is provided with a valve seat and the secondary
steam valve is formed on the valve stem in rear of the primary steam valve.
The secondary combining tube is arranged in rear of the secondary steam nozzle,
and the secondary delivery tube is formed upon the rear end of the secondary
combining tube and provided at its rear end with a tubular extension which open-
into the water outlet.
The overflow chamber is arranged in the rear portion of the injector behind the
secondary water chamber and is provided with an exit through which the water
escapes from said chamber in starting the injector. A primary overflow opening
is formed in the rear wall of the overflow chamber and a primary overflow passage
connects the secondary water chamber with the opening. A cylindrical valve seat
is formed in the primary overflow opening and a primary overflow valve of
cylindrical form is arranged within the passage opposite the valve seat and con-
trolling the admission of water into the overflow chamber through the primary
overflow opening.
The primary overflow valve is attached to a stem which passes through a stuffing
box in the rear portion of the shell. The stem is provided outside of the shell with
a cross head which latter is connected to the yoke and hand lever by links, so that
the primary overflow valve is moved towards its seat at the same time that both
steam valves are moved away from their seats, or vice versa.
A secondary overflow passage surrounds the secondary delivery tube and
extension, and openings are formed in said extension whereby the latter is connected
with the secondary overflow passage. A tubular neck extends down from the
secondary overflow passage through the primary overflow passage and to the
overflow chamber below it.
A conical valve seat is formed in the upper end of the neck a secondary overflow
valve is arranged within the secondary overflow passage above the valve seat and
provided on its underside with a tubular stem arranged in the neck whereby this
valve is guided. The upper end of the tubular stem is provided with openings
which permit the water to flow from the secondary overflow passage through the
tubular stem into the overflow chamber when the valve has been raised. This

page_text: valve is held down against its seat by gravity and by the pressure of the fluid in
the secondary overflow passage bearing upon the top of the valve. This valve-is
inserted and removed through an opening in the upper side of the shell which is
closed by a screw plug, the extensions and secondary combining and delivery tubes
being first removed to afford access to the valve. When the valve rests upon its
seat its tubular stem extends downwardly into the overflow chamber.
The front end of the stem carrying the primary overflow-valve is bifurcated and
arranged in the overflow chamber. A lifting pawl is pivoted in the bifurcated end
of the valve stem, and adapted to raise the secondary overflow valve and hold the
same in an open position. This lifting pawl is provided in its free end, and on its
upper side with a notch forming a shoulder which is adapted to bear against the
lower front portion of the edge of the tubular stem of the secondary overflow-valve
and beyond said shoulder with a finger.
When both overflow valves are closed the lifting pawl extends rearwardly from
its pivot between the jaws of the valve stem and cats with its shoulder against the
front side of the tubular stem of the secondary overflow valve and with its finger
along the underside of said stem.
Upon shifting the hand lever rearwardly the primary overflow valve recedes
from its seat, and the shoulder of the lifting pawl bears upwardly against the lower
edge of the tubular stem of the secondary overflow valve, which causes the lifting
pawl to swing upwardly with its free end and raise the secondary overflow valve
from its seat.
During the rearward movement of the primary overflow valve the pivotal point
of the lifting pawl is carried rearwardly, which causes the finger of the pawl to
enter the stem of the secondary overflow valve. At this rearward movement of the
pawl continues the shoulder of the pawl leaves the front portion of the valve stem
and the curved back of the pan engages under the rear portion of the valve stem
and lifts the valve still further and finally holds the valve in its highest position.
Upon shifting the hand level in the opposite direction, the lifting pawl swings
downwardly and permits the secondary overflow valve to seat itself by gravity.
The downward movement of the lifting pawl is limited by a stop shoulder formed
between the jaws of the bifurcated valve stem.
The movements of the primary and secondary overflow valves are so timed with
reference to the steam valves, that in shifting the hand lever to start the injector,
the primary over flow valve is closed a short time in advance of the opening of the
secondary steam valve, and the secondary overflow valve is closed a short time after
the secondary steam valve is opened.
When the injector is not in operation both the steam valves are closed and both
the overflow valves are open.
The pressure against the secondary overflow-valve, when the injector is in
operation, is so great that it requires considerable power to open the same when it
is desired to shut off the injector.
The arrangement of the primary overflow valve in the rear wall of the overflow
chamber, and the arrangement of the secondary valve in the top of that chamber
and its connection with the secondary overflow chamber by the upright tubular neck
renders the arrangement of these parts very compact and convenient and renders
the parts easily accessible.

page_text: COMPLETE SPECIFICATION.
Improvements in Injectors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings in the County of Middlesex, 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 :-
This invention relates to the overflow devices of injectors and has for its object
to facilitate the opening of the overflow valves and to render the parts more readily
accessible.
In the accompanying drawing:
Figure 1 is a longitudinal sectional elevation of the improved injector taken on
line 1-1 Figure 3, showing the position of the parts after the injector is started.
Figure 2 is a top plan view of the injector.
Figure 3 is a horizontal section on line 3-3, Figure 1.
Figure 4 is a vertical transverse section on line 4-4 Figure 1.
Figure 5 is a fragmentary sectional elevation, on an enlarged scale, of the steam
valves and connecting parts.
Figure 6 is a fragmentary plan view of the primary overflow valve and the lifting
pawl for operating the secondary overflow valve.
Figure 7 is a fragmentary longitudinal section, on an enlarged scale, of the rear
portion of the injector, showing the overflow valves open, and
Figure 8 is a similar view, showing the primary overflow valve closed and the
Becondary overflow valve open.
Like letters of reference refer to like parts in the several figures.
In the injector constructed according to this invention A represents the shell or
casing of the injector; B the primary stean chamber; b the steam inlet; C the
secondary steam chamber; D the primary water chamber and d the water
inlet. F is the primary steam valve, and fits valve seat; f¹ is the stem of this
valve. The stem is secured at its front end to a yoke G which slides upon a
stud g and is actuated by a hand lever H, connected with the shell by a link h.
I is a primary steam nozzle, J the primary combining tube, and J¹ the delivery
tube whereby the water is delivered from the primary water chamber into the
secondary water chamber k.
L represents the secondary steam nozzle provided with a valve seat l, and m is
the secondary steam valve formed on the valve stem f' in rear of the primary steam
valve F. is the secondary combining tube arranged in rear of the secondary
steam nozzle, and n' is the secondary delivery tube formed upon the rear end of the
secondary combining tube and is provided at its rear end with a tubular extension n*
which opens into the water outlet o.
P indicates an overflow chamber arranged in the rear portion of the injector
behind the secondary water chamber, and p is the exit through which the water
escapes from said chamber in starting the injector. q is a primary overflow opening
formed in the rear wall of the overflow chamber, and g' is a primary overflow
passage connecting the secondary water chamber with the opening q. q³ is a
cylindrical valve seat formed in the primary overflow opening 9, and r is the primary
overflow valve of cylindrical form, arranged within the passage 9, opposite the
valve seat 92, and controlling the admission of water into the overflow chamber
through the primary overflow opening.
The primary overflow valve is attached to a stems which passes through a
stuffing box sin the rear portion of the shell. The stem s is provided outside of
the shell with a cross heads, which latter is connected to the yoke and hand lever
by links, so that the primary overflow valve is moved toward its seat at the
same time that both steam valves are moved away from their seats, or vice versa.

page_text: T represents a secondary overflow passage surrounding the secondary delivery
tube and extension n³, and t are openings formed in said extension, whereby the
latter is connected with the secondary overflow passage.
u represents a tubular
neck extending down from the secondary overflow passage through the primary
overflow passage and to the overflow chamber below it.
represents a comical valve seat formed in the upper end of the neck u, and u² is
the secondary overflow valve arranged within the secondary overflow passage above
the valve seat and provided on its underside with a tubular stem arranged
in the neck, which serves as a guide for the said stem of this valve. The upper
end of the tubular stem is moreover provided with openings which permit the
water to flow from the secondary overflow passage through the tubular stem into
the overflow chamber, when the valve has been raised. This valve is held down
against its seat by gravity and by the pressure of the fluid in the secondary over-
flow passage bearing upon the top of the valve. The said valve is inserted and
removed through an opening in the upper side of the shell which is closed by a
screw plug, the extension n' and secondary combining and delivery tubes being
first removed to afford access to the valve. When the said valve rests upon its seat,
its tubular stem extends downwardly into the overflow chamber.
The front end of the stem carrying the primary overflow-valve is bifurcated and
arranged in the overflow chamber, as shown in Figures 1, 6, 7 and 8. V represents
a lifting pawl which is pivoted in the bifurcated end of the valve stem, and adapted
to raise the secondary overflow valve and hold the same in an open position. This
lifting pawl is provided at its free end, and on its upper side, with a notch forming
a shoulder which is adapted to bear against the lower front portion of the edge of
the tubular stem of the secondary overflow valve, and beyond said shoulder with a
finger v¹.
When both overflow valves are closed, the lifting pawl extends rearwardly from
its pivot between the jaws of the valve stem and rests with its shoulder against the
front side of the tubular stem of the secondary overflow valve and with its finger
along the underside of said stem, as represented in Figure 1.
Upon shifting the hand lever rearwardly, in the direction of the arrow in
Figure 1, the primary overflow valve recedes from its seat, and the shoulder of the
lifting pawl bears upwardly against the lower edge of the tubular stem of the
secondary overflow valve, causing the lifting pawl to swing upwardly with its free
end and raise the secondary overflow valve from its seat, as represented in
Figure 8.
During the rearward movement of the primary overflow valve, the pivotal point
of the lifting pawl is carried rearwardly, causing the finger of the pawl to enter the
stem of the secondary overflow valve. As this rearward movement of the pawl
continues, the shoulder of the pawl leaves the front portion of the valve stem and
the curved back of the pawl engages under the rear portion of the valve stem and
lifts the valve still further and finally holds the said valve in its highest position, as
represented in Figure 7.
Upon shifting the hand lever in the opposite direction, the lifting pawl swings
downwardly and permits the secondary overflow valve to seat itself by gravity.
The downward movement of the lifting pawl is limited by a stop shoulder w,
formed between the jaws of the bifurcated valve stem see Figures 7 and 8.
The movements of the primary and secondary overflow valves are so timed with
reference to the steam valves, that in shifting the hand lever to start the injector,
the primary overflow valve is closed a short time in advance of the opening of the
secondary steam valve, and the secondary overflow valve is closed a short time after
the secondary steam valve is opened.
When the injector is not in operation, both steam valves are closed and both
over How valves are open.
The pressure against the secondary overflow valve, when the injector is in
operation, is so great that it requires considerable power to open the same when it
is desired to shut off the injector.

page_text: The arrangement of the primary overflow valve in the rear wall of the overflow
chamber, and the arrangement of the secondary valve in the top of that chamber
and its connection with the secondary overflow chamber by the upright tubular
neck, renders these parts very compact and convenient and easily accessible.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me by my
foreign correspondents, I declare that what I claim is :-
1. In an injector, the combination with the overflow chamber and an overflow
valve applied to said chamber, of a valve stem and a lifting pawl pivoted to said
stem and engaging against the overflow valve, substantially as set forth.
2. In an injector, the combination with the overflow chamber and an overflow
valve applied thereto, of a valve stem and a lifting pawl pivoted to said stem and
provided with a shoulder adapted to bear against the valve, substantially as set
forth.
3. In an injector, the combination with the overflow chamber and an overflow
valve applied thereto and provided with a tubular stem, of a sliding valve stem
arranged underneath the tubular stem of said valve, and a lifting pawl pivoted to
said sliding valve stem and provided with a shoulder adapted to bear against the
underside of the tubular stem and beyond the shoulder with a finger adapted to
enter said tubular stem, substantially as set forth.
4. In an injector, the combination with the overflow chamber, and the primary
and secondary overflow passages, of a tubular connection extending from the
secondary overflow passage through the primary overflow passage into the overflow
chamber, a secondary overflow valve seated in said tubular connection, a primary
overflow valve seated in the rear wall of the overflow chamber, and mechanism
connecting the primary with the secondary valve, for operating the secondary valve
by the movement of the primary valve, substantially as set forth.
Dated this 12th day of September 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.