Year: 1886

page_text: I, HENRY HARINGTON LEIGH, practising as Phillips & Leigh, of No 22, South-
ampton Buildings, Chancery Lane, W.C., in the County of Middlesex, Engineer &
Patent Agent, 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 to an improved method of providing for and regulating the
supply of combustible to gas and other engines the motive power in which is
generated by the ignition within the cylinder of a charge of mixed combustible gas
or vapour and air.
.
This invention is particularly applicable as an alternative or improved supply
valve gear for the engine described in the Specification of Letters Patent, N° 3414
of 1885, granted to my said communicator Johannes Spiel.
In order that my invention and the means by which it is intended to be carried
into practical effect may be thoroughly understood, I will describe it in detail,
referring in so doing to the accompanying drawings which are to be taken as part
of this specification and read therewith, and in which like parts are marked
throughout the figures with the same reference letter.
Figs. 1 and 2 are, respectively, front and side elevations.
Fig. 3 is a horizontal section taken on the line y-z of Fig. 2, but. drawn
double size.
Fig. 4 is an elevation of the cam mechanism, on the shaft, w, to actuate the
lever, G.
The apparatus illustrated in the four figures now being described consists,
essentially, of three parts, viz:-
1. The measuring mechanism consisting of a pump A, with its piston, K, and
valves, 8, and e.
2. The suction valve in the cavity of which the combustible is mixed with
its proper quantity of air, and communication between which and the measuring
mechanism is through a port, L.

page_text: 3. The valve actuating mechanism consisting of the slide, S; the elbow Tq,
carrying at one extremity the roller, j, and pressed against the slide S by the
spring F, and at the opposite one, the set screw or pin, m.
The action of the apparatus is as follows.
The figures illustrate the relative positions of the various parts shewn, at the
moment when the piston, K, has reached the top of its stroke, having, therefore,
just completed the inspiration into the pump A, of a charge of combustible-gas or
petroleum as the case may be-through the supply pipe, B; the suction valve, 8,
and the delivery valve, e, being kept, the former open, and the latter shut, by the
spring, f.
So soon as the end of the lever G, passing through a slot in the top of the
piston, K, is depressed by the cam on the shaft, w; the slide, S, which up to that
moment was keeping the elbow, T q, in contact with the valve spindle, is like-
wise depressed; the recess, p, being brought opposite the roller, j, which is,
consequently, forced into the recess by the spring F; and the pin m, pulled against
the valve spindle, v. The latter transfers the pressure to the valves e, and 8,
opening the former, shutting the latter, and compressing the spring, f, (which is
proportionately weaker than the larger one F), accordingly.
Such are the means by which, according to my invention, the communication
between the supply of combustible and the valve mechanism is suspended, and one
between the latter and the mixing valve V, at the same time, opened.
The slot in the top of the piston, K, through which the lever, G, reaches the top
of the slide, S, is deep enough to permit of the above described movements being
performed without the piston being moved; but, so soon as the slide, S, has been
depressed a proper distance (it is provided as shewn in Fig. 1, with a suitable
adjusting device), the continued descent of the lever, G, forces the piston, K, down;
and it consequently drives the charge of combustible through the port, 1, and the
valve, V, into the ignition chamber of the engine.
It is obvious that a charge of petroleum in course of injection into the mixing
valve or chamber of an engine from the bottom of the pump A, cannot pass, in
mass, through the port, l, but must assume the section of a thin tube because of the
fluted pin, y, lying in the port, l, between the valves, 8, and e.
The further passage of the petroleum towards the cavity of the valve, V, is
obstructed by the valve, e; the end of the valve spindle, v; and lastly by the
conical valve, x. The result is, that the petroleum enters the cavity of the valve, V,
in the condition of a fine spray, and, therefore, capable of making, automatically, a
perfect admixture with the air of combustion.
The return, i.e. rise of the lever G, takes the slide, S, up with it; the elbow Tq.
is returned to its former position, at the same time taking the pin, m, off the
valve spindle, v; whereupon the spring, f, shuts the valve, e, and opens the
valve, 8. The piston, K, then makes another stroke, drawing in a fresh supply of
combustible.
It is evident that the length of the stroke of which the piston, K, is capable of
making decides the quantity of combustible supplied. The piston is, therefore,
furnished with a regulating screw, X, capable of adjusting the depth of the
said slot.
The shape of the cam illustrated in Fig. 4 is decided by the necessity of actuating
the valves, 8 and e, with a short quick stroke, in order that the charge of com-
bustible may be injected through the port, l, equally during the duration of the
stroke of the piston.
The engine is governed by providing for the pin, m; being pushed out of line
with the valve spindle, v by the action of the governor whenever the load is
suddenly diminished, or the speed of the engine on the point of being unduly
accelerated by any cause. Whenever the governor pushes the pin, m, to one side
so as to miss the spindle, v, the next charge of combustible would be forced into the
pipe B instead of past the valve, e.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is,
1. The combination of pump A, its piston K, the slot I in the top of the latter,
and the lever G passing through the said slot for the purpose of actuating it
intermittently, substantially as described with reference to the accompanying
figures 1, 2, 3 and 4.
2. Providing for the delivery of a charge of combustible into the igniting or
mixing chamber of a petroleum or of a gas engine, by injecting it through an
impeded port and past a conical valve for the purpose of breaking the combustible
up into a fine spray, substantially as described with reference to the accompanying
figures 1, 2, 3 and 4.