Improvements in Feed-water Injectors for Steam Boilers.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Feed-water Injectors for Steam Boilers.
A communication by PARKER PILLSBURY HOGUE, of Cincinnati, in the County of
Hamilton and State of Ohio, United States of America, Gentleman, and
HENRY GAYLORD WILSHIRE, of Tooting, near London, England, but at the
time of this communication temporarily sojourning in Cincinnati aforesaid,
Gentleman.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.1.M.E. of The Agency for.
Foreign Patent Solicitors, 6 Lord Street Liverpool and 6 Bank Street Manchester
both in the County of Lancaster and 323 High Holborn in the County of Middlesex,
Civil 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 :-
This invention relates to improvements in feed water injectors for steam
boilers, and it has for its general object to provide an injector embodying a
removable end piece or bushing carrying a removable delivery tube and detachably
connected to a removable combining tube, whereby the combining tube and the
delivery tube may be removed together from the shell or casing of the injector, by
simply removing the end piece or bushing, and may then be readily and separately
disconnected from the said end piece or bushing for repairs or to give place
to new parts.
With the foregoing ends in view, the invention will be fully understood from the
following description and claims, when taken in connection with the accompanying
drawings, in which; Figure 1 is a longitudinal section of an injector embodying
this invention, and Figure 2 is a detail perspective view, illustrating the end piece
or bushing, the delivery tube and the combining tube, as they appear when
removed together from the shell or casing of the injector.
The injector A, illustrated in the drawings, is provided, at the feed end of the
shell or casing, with interior and exterior threads ab and is also provided with
apertured partition walls c c in which is mounted a removable combining tube B.
This combining tube B is provided, adjacent to its inner end, with a shoulder d
designed to limit its inward movement, and it is also provided with a forward-
extending cylindrical portion C which has ports, as e, communicating with one of
the chambers of the shell or casing, and interior threads f which latter are designed
for the engagement of the end-piece or bushing D whereby it will be seen that the
end piece or bushing may be directly connected to the combining tube, that is to
The said bushing
say, without the connection of any other part between them.
or end piece D is provided with a squared portion 9 designed to afford an
engagement for a wrench and with a flange h designed to abut against the
feed end X of the injector casing, and it has a reduced and threaded portion i
designed to engage the threads a of said casing and the further reduced and
threaded portion which is designed to engage the threads in the portion of the
combining tube, so as to effect a detachable connection between the end piece or
bushing and the tube.
The end piece or bushing D is further provided with a threaded bore, as k, for
the reception of the exteriorly threaded delivery tube E which rests adjacent to
the discharge end of the combining tube and has an angular shoulder or head l.
designed to bear against the inner end of the end piece or bushing and also designed

page_text: to afford a hold for a wrench. This delivery tube E on account of the velocity of
the water, passing through it, is more likely to wear than any other part of the
injector, and my correspondents therefore contemplate making it of hard metal, in
order to prolong its usefulness. This may be done without materially increasing
the cost of the injector, as this improved delivery tube, on account of its small size,
embodies but a small amount of metal, and, when desired, an engineer can
conveniently carry one or more of the delivery tubes in his pocket, so that he can
readily replace the tube in the injector when necessity demands it.
Findicates a line check or pipe which is arranged intermediate the feed end of
the injector casing and the boiler. This line check or pipe is provided at one end
with interior threads designed to engage the exterior threads 6 of the injector
casing, and it is also provided with a shoulder p which bears against the flange h
of the end piece or bushing D, so as to make a tight joint and prevent the said
end piece or bushing from working loose.
It will be understood from the foregoing that the combining tube is similarly
mounted in and not connected to, the partition walls of the injector, and, will
therefore be seen that when the line check or pipe is disconnected, the combining
tube may be removed with the end piece or bushing by simply applying a wrench
to the portion g of the latter and turning the same outward. When the directly
connected piece or bushing and the combining tube are removed from the shell or
casing, the combining tube alone may be disconnected from the end piece or
bushing and a new combining tube placed in position without disturbing any of the
other parts.
When the combining tube has been disconnected from the end piece, the delivery
tube, which embodies but a minimum amount of metal and is not connected to the
combining tube, may be readily disconnected from the end piece or bushing and a
new delivery tube may be placed in position, if necessary. The removal of the
connected parts from the shell or casing and their after disconnection, as well as the
connection of a new part, when necessary, may be effected without the aid of any
implement other than a common wrench. It will, therefore, be appreciated that
an engineer can repair the injector when it fails to work, without the loss of time,
which is a desideratum. By reason of this improvement, the injector can be quickly
and easily repaired by an engineer at but a slight cost, and the usefulness of the
injector as a whole prolonged for an indefinite period of time, which is a desideratum
in this class of devices.
While it is preferred to arrange the delivery tube E with its head bearing
against the inner end of the end piece or bushing, as before described, my
correspondents do not desire to be understood as confining themselves to such
disposition of the tube, as, in some cases, it may be arranged with its head l
bearing against the outer end of the end piece or bushing, so as to admit of its
being removed without disconnecting the end piece or bushing from the combining
tube. They have in some respects specifically described the construction and
relative arrangement of the parts comprised in the improvements, in order to
impart a full and exact understanding of the same, but they do not desire to be
understood as confining themselves to such specific construction and arrangement,
as such changes or modifications may be made in practice as fairly fall within the
scope of the invention. They also do not desire to be understood as confining
themselves to the use of the improvements in the type of injector shown in the
drawing, as they may be employed in any injector to which they are applicable.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as coinmunicated to me by
my foreign correspondents, I declare that what I claim is :-
1. A feed water injector for steam boilers, comprising a removable end piece or
bushing having a threaded bore and an exteriorly threaded and removable delivery
tube arranged in said bore and connected to the end piece or bushing alone and not
connected to, or engaging, any other part, substantially as specified.

page_text: 2. A feed water injector for steam boilers, comprising a shell or casing having
interior and exterior threads at its fed end, a removable end piece or bushing
carrying a removable delivery tube and having exterior threads to engage the
interior threads of the casing and also having a flange h adapted to abut against
the end of the said casing, and a line check or pipe having interior threads to
engage the exterior threads of the casing and also having a shoulder p adapted to
bear against the flange of the end piece or bushing, substantially as and for the
purpose set forth.
3. A feed water injector for steam boilers, comprising a casing, a removable
combining tube, and a removable end piece detachably connected directly to the
combining tube, whereby the end piece and combining tube may be together
removed from the casing and then disconnected, substantially as specified.
4. A feed water injector for steam boilers, comprising a casing, a removable
combining tube arranged in said casing, a removable end piece or bushing
detachably connected directly to the combining tube, and a delivery tube carried by
and detachably connected to the end piece or bushing whereby the combining tube.
the end piece or bushing and the delivery tube may be together removed from the
casing, and the combining tube and delivery tube then disconnected from the end
piece or bushing substantially as specified.
5. A feed water injector for steam boilers, comprising a casing, a removable
combining tube arranged in said casing and having an extended and interiorly
threaded cylindrical portion C, a removable end piece or bushing detachably
connected to the casing and having exterior threads to engage the threads of the
portion C and also having an interior threaded bore and an exteriorly threaded
delivery tube arranged in the bore of the end piece or bushing, substantially as
specified.
6. The herein described feed water injector for steam boilers, comprising a shell
or casing having interior threads at its feed end, a removable combining tube
arranged in the shell or casing and having an extended and interiorly threaded
cylindrical portion C, an end piece or bushing D having exterior threads to engage
the threads of the casing and tube portion C, and also having an angular portion g,
the flange h, and the interior threaded bore, and an exteriorly threaded delivery
tube adapted to take into said bore and having an angular head or shoulder,
substantially as and for the purpose set forth.
7. A feed water injector for steam boilers, comprising a casing, a removable
combining tube arranged in said casing and having an extended and interiorly
threaded cylindrical portion C and a removable end piece or bushing detachably
connected to the casing and having exterior threads to engage the threads
of the casing, and also exterior threads to engage the portion C, substantially as
specified.
Dated this 15th day of October 1894..
WM. P. THOMPSON & Co.,
Agents.