Improvements in Injectors.
Year: 1890

page_text: Complete Specification Left, 25th Oct., 1890-Accepted, 20th Dec.,
COMPLETE SPECIFICATION.
Improvements in Injectors.
10317
I, WILLIAM MCSHANE, residing at St. John, in the County of St. John, Province
of New Brunswick, and Dominion of Canada Inventor 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 relates generally to injectors and particularly to that class thereof
known as double tube injectors, one tube of which is designed to draw water from
the source of supply and deliver it to the second tube which forces it into the boiler.
The object of my invention is to provide an injector of the class described, which
shall be simpler and more compact in its construction, and more efficient and convenient
in its operation.
With this object in view my invention consists in providing a double tube injector
having overflow and discharge passages, with an additional passage communicating
with the forcer tube and overflow passages, and the tubular two-way cock establishing
said communication. My invention consists further in certain details of construction,
and combination of parts such as shown in the drawings and set forth in the
description.
In the accompanying drawings,
Fig. is a vertical longitudinal section of my improved injector ;
Fig. 2 is a transverse vertical section, taken on the plane of the line 2-2 of Fig. 1 and
Fig. 3 is a detail view of the washer, lug and connecting rod.
In the embodiment of my invention, I employ a casing A, containing lifting and
forcing appliances, said casing being connected with the steam and water supplies by
means of the pipes S and W respectively. The overflow passage D, and the discharge
passage E are preferably formed integral with the casing of the injector. The lifting
apparatus consists as usual of the steam chamber S, lifter steam nozzle a, and
the lifter combining tube , and the forcing apparatus consists of the forcer steam
nozzle c, forcer combining tube d, and the steam chamber communicates also with
this apparatus. The lifting and forcing devices are connected by means of the
horizontal chamber J and the vertical chamber C¹¹. All of the said parts for lifting
and forcing the water may be of any approved pattern but it is preferred to employ
constructions at least somewhat similar to those shown in my U. S. Patent No. 362300,
dated May 3, 1887.
Directly beneath the forcer combining tube is formed the passage () which curves
off in its downward course and joins the discharge passage E.
At the juncture of the chambers J and C is formed an additional passage B, said
passage extending downward and communicating with the passages (, D, and E by
means of the two-way tubular cock or plug F arranged in the casing at the juncture
of the passages B and C and the overflow passage D.
The passage is preferably larger at its upper extremity. The operating lever F¹ is
secured upon one end of the plug F, said lever being provided with a lug F which
engages a stop F formed upon the casing to limit the movement of the lever. A
washer H is arranged upon the opposite end of the plug said washer having the

page_text: eccentric lug H₁ slotted as shown at H in Figure 3. The connecting rod G is
secured at its lower end to the eccentric lag by means of the screw or bolt H working
in the slot of the said lug. The upper end of the connecting rod is rigidly connected with
the valve spindle K which operates the valve L to close and open the same in concert
with the opening and closing of the plug F.
The construction of my improved injector having been fully described, I will now
describe its operation:--We will suppose the steam and water passages to be open.
In this class of injectors it is necessary to have a communication between the lifter
side of the injector and the external atmosphere. This communication is had directly
with the air by means of the passage B and the two-way cock F. the plug being so
turned that communication is established between the passages B, C, and D. The
valve L is now closed. The water is drawn through the pipe W and forced into the
chamber J where it immediately flows into the passage B through the two-way cock F
and out through the overflow passage D. The lever F¹ is now shifted until the lug F
comes in contact with the stop F1 which limits its movements and renders its action
positive and certain. The cock in being so turned operates the connecting rod G and
opens the valve L when the forcer side of the injector is set into operation.
I am aware that passages have been made communicating with the forcer side of
the injector and the overflow, and that valves have been employed to regulate said
passage, but in all of these devices, so far as I am aware, there is a very complicated
arrangement of valves, rendering the device expensive, difficult in its operation and
greatly impairing its efficiency, whereas in my improved injector, the two-way cock
is much simpler, cheaper and more efficient than a complicated set of levers. The
lever being provided with the stop, limits the motion of the same and the slotted
lug on the washer to which the connecting rod is attached insures a positive vertical
movement of said rod.
Having now particularly described and ascertained the said invention and in
what manner the same is to be performed I declare that what I claim is:
1. In a double tube injector, the combination with the casing provided with over-
flow and discharge passages and an additional passage communicating with the forcer
side and overflow passage, of a two-way cock establishing the communication between
said passage and the overflow and discharge passages, substantially as shown and
described.
2. An improved injector consisting of a double tube casing A having the overflow D,
discharge E and passage B communicating with the forcer side and the overflow, the
two-way cock F communicating with the passage B, overflow D and discharge E,
lever F for operating said cock, washer H, connecting rod G and valve spindle K
operating valve L, all arranged so that when cock F is open, the valve L is closed and
vice versa substantially as and for the purpose described.
3. An improved injector consisting of the double tube casing A, having the
overflow D, discharge E and passage B leading from the forcer side of the injector
to the overflow, the two-way cock or plug F establishing communication between
the passage B, overflow D and discharge E, the lever F¹ for operating said plug or
cock, said lever having the lug F adapted to abut against the lug F, the washer H
upon one end of the plug, said washer having the eccentric lug H₁ slotted at H
the connecting rod G and means for connecting the said rod and eccentric lug, the
steam valve L and spindle K, all arranged so that when the valve L is opened, the
cock F is closed and vice versa, substantially as and for the purpose set forth.
Dated this 25th day of Oatahau 100:1
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.