Year: 1888

page_text: A communication 'from abroad by STEPHEN 'OLIN JOHNSON, Manufacturer, of
Detroit, in the State of Michigan, in the United States of America.
I, CHARLES AUBREY DAY, Fellow of the Institute of Patent Agents, of .321, High
Holborn, in the County of Middlesex, do hereby declare the nature of the. said
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 pertains to certain new and useful improvements in steam injectors;
and it consists in the detailed construction, combination, and arrangement of the parts.
substantially as hereinafter fully set forth, and particularly pointed out in the
claims.
In the accompanying drawings, Figure 1. is a vertical sectional view of my inven-
tion; Figures 2, and, 3, are detail views and Fig. 4 is an external elevation.
In carrying out my invention, I employ a casting or tubular casing, A, having
three laterally projecting arms, a, a¹, a², the arm, a, being formed in one side thereof
and having, in practice, suitable connection, by a separable screw-threaded pipe
section, with a water pipe leading from the source or supply of water, vide Fig. 4.
The branch or arm, a¹, extending from the lower portion of the casting or tubular
casing, near one end thereof, has a separable screw-threaded pipe section, for the
connection thereto of a pipe leading to the boiler to be supplied with water, vide Fig. 4,
and in one side of the tubular casting or casing is formed the branch or arm, a²,
wherein is secured the overflow valve.
Within the steam supply end of the casing, A, is secured the steam jet pipe, B; the
same having a slightly contracted.inner end, the passage thereof flaring from a point
near.its.centre to said erd, as shown in Figure 1.
The casting or tubular casing, A, comprises a water supply chamber, C; and an

page_text: overflow water chamber, (1, the same being separated by an apertured wall, C²,
wherein is rigidly secured the lifting tube, D, which has formed within its inner end
a circular chamber or ring, d, which bears against one side of said apertured wall, the
purpose of which will soon appear.
E, is the combining tube, which has a central tapering aperture, e, and at its lower
end, where said combining tube is formed integral with the delivery tube F, are a
series of small apertures e², the office of which will soon appear. Immediately
adjoining these apertures is formed a screw threaded thickened portion, e¹, of the
delivery-tube, and adjacent to this screw-threaded portion is a large ring or
washer e, formed integral, and its lower portion is narrowed, forming a projecting
ring-like end, as shown. Over this combining tube is placed a cylindric casing or
jacket, G, slightly larger than the combining-tube, and on its lower inner surface is
formed a female screw-thread for securing the same on the correspondingly-threaded
portion, e, of the delivery tube, and this cylindric casing or thimble encloses the
combining tube a portion of its length, as shown.
In practice the upper end of the combining-tube projects within the chamber or
ring, d, to within a short distance of the central aperture of the lifting-tube, D.
H, is a small lifting-valve, flat on its upper and lower surfaces, as shown, and this
valve is slipped on the narrow combining-tube, E, its under side resting on the upper
horizontal edge of the cylindric casing or jacket, G, closing the opening between the
same and the combining tube, and when thus resting on the casing or thimble a small
space is left between the upper horizontal face of the valve and the lower edge of the
ring or chamber of the lifting tube.
The overflow water chamber, Ot, has a circular flange, f, formed at a point
immediately adjacent to the inner end of the arm or branch, a, and against this flange
bears the upper surface of the ring or washer, el, of the delivery tube, the same being
retained thereat by means of a plug 13, screwed in. the lower portion of the injector,
so as to cause its upper edge to bear against the ring or washer. This inner portion
of the ring or washer is provided with suitable apertures, i, to permit the escape of
water from the interior of the plug to the branch or arm leading to the boiler, as will
appear farther on.
Within the lateral curved arm, a², is secured the overflow valve, I,
the same consisting of a disk f' fitting the overflow hole or opening f", formed in the
wall of the casting or casing at that point, and this disk has a hollow sleeve or
cylindric extension, g, projecting from its rear side, upon which is passed one end of
au arm, I, the other end of said arm being pivoted by a small cross bar or rod, g¹,
secured at its ends in apertured lugs formed on the upper portion of either side wall of
the curved lateral arm, a². After passing the end of arm, I', on the sleeve or
extension, g, a small washer, g³, is also passed or inserted thereon, and the same are
secured in position by means of a small screw, gt, screwed into the outer open end of
said sleeve or extension, the latter having for this purpose a female screw-thread
formed on its inner surface. The outer side of the wall or casing around the overflow
hole or opening, f¹¹, is so formed as to cause the valve, when in its normal position, to
occupy a slanting or inclined position, thus always insuring the seating of the disk
over the overflow hole or opening. The extension, g, is screw-threaded, so as to
regulate its adjustment on the end of the pivoted arm, I. The curved lateral arm is
provided on its outer curved portion with an ordinary screw cap, I², permitting easy
access to the overflow valve when desired.
The operation is as follows:-Steam being admitted into the jet pipe passes through the
tapered passage thereof into the lifting tube, causing the lifting of the water into the water
supply chamber through the lifting tube and out into the overflow chamber, while that
which enters the combining tube passes out through the series of apertures in the lower
end thereof into the cylindric casing or jacket, G, and, passing up around the outside of
the combining tube, will force the lifting valve from its seat on the upper end of the
casing or jacket, and the rapid flow of water forces said valve up sufficient for the
vacuum within the ring, d, to bring it to its seat against the lower edge of the chamber
or ring, d, thus closing or cutting off the inflow of hot water over the mouth of the
combining tube, enabling the injector to be started with a low pressure of steam, and

page_text: as soon as the injector starts the hot water ceases to flow through the apertures in the
combining tube. Should the sliding valve happen to remain in its elevated position
against the chamber or ring, d, upon restarting the injector the steam jet will force the
same down on the upper edge of the casing or jacket until removed by the current of
hot water created by the passage of the same up through said casing or jacket, as
above detailed. It will be understood, of course, that the water which passes into the
overflow chamber effects the raising of the overflow valve from its seat, permitting the
escape thereof. When the injector is working, the steam and water will pass through
the passage of the delivery tube, and striking against the inner end of the plug, I³,
will pass out through the apertures formed in its inner portion on to the
boiler.
From what has been said it will be seen that my injector is operated by a current of
hot water passing through the combining tube into the cylindrical chamber, whereby
the inflow over the mouth of the combining tube is closed, permitting the starting of
the injector at a low pressure of steam, which is a desideratum in this class of inventions;
and it will also be seen that the spill or overflow of the combining tube empties
through the relief holes directly into the closing casing or jacket or secondary relief
surrounding the same, which is one of the principal features of my injector. By this
means the passage of the overflowing water is at two points when the water is first
turned on, and after entering the combining tube the water passes through the relief
ports or apertures into an enclosing casing or jacket, which passing of the water,
through the agency of the valve, closes the inflow of hot water over the mouth of the
combining tube and permits the ready starting of the injector, as above set forth.
By this means uniformity in the working of the injector is secured, and no danger
arises from having open to too great an extent the valve in the water supply pipe.
Having now 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. The herein described method of starting an injector at a low pressure of steam,
consisting in closing the upper overflow by means of a sliding valve operated by a
current of water passing from the combining tube, substantially as set forth.
2. In an injector, the combining tube having apertures or relief holes at its lower
end for emptying the spill or overflow directly into a cylindric casing or jacket or
secondary relief enclosing said end of the combining tube, as and for the purpose
set forth.
3. In an injector, the narrow combining tube, the cylindric casing or jacket enclosing
the same, and the sliding valve fitted on said combining tube, substantially as shown
and for the purpose set forth.
4. The combination with the casting or tubular casing, and its compartments, of the
lifting tube having a circular chamber or ring, the stationary combining and delivery
tubes, the cylindric casing or jacket enclosing said combining tube, and the sliding
valve for opening and closing the opposite ends of said casing or jacket and a circular
chamber or ring, substantially as shown and described.
5. The combination with the tubular casing or casting, the steam jet, and the lifting
tube having the circular chamber or ring, of the combining tube having apertures at
its lower end, the enclosing casing or jacket forming a space around said combining
tube, and the sliding valve having a flat upper face, substantially as shown and for the
purpose stated.
6. The overflow valve consisting of the disk having a sleeve or extension and the
pivoted arm secured thereon, substantially as shown and described.
7. The combination with the easing having a curved lateral arm, of the pivoted arm
and the disc having an internally threaded extension fitted in the free end of said arm,
substantially as shown and described.
8. The combination with the casing having its outer wall inclined around the over-
flow opening and the lateral arm, of the overflow valve pivoted in said arm and

page_text: occupying the described relative position to said opening, substantially as shown and
described.
9. The herein described injector, comprising the casing, the water supply and over-
flow chambers, the lifting, combining and delivery tubes, the circular chamber or ring,
the lifting valve, the cylindric casing or jacket, the curved lateral arm, and the over-
flow valve consisting of the pivoted arm, and the disc baving an extension secured by
said arm;
substantially as shown and described.
Dated this 18th day of June 1888
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.