IMPROVEMENTS IN to be as follows:- GAS MOTOR ENGINES .
Year: 1884

page_text: I GEORGE TURNER, of the St Albans Iron Works, in the City of St Allans,
Engineer, do hereby declare the nature of my invention for "IMPROVEMENTS IN
to be as follows:-
GAS MOTOR ENGINES
.
"
―
"
This invention relates to improvements in gas motor engines.
The main object of my invention is to secure the certain and rapid ignition of
a mixture of combustible gas or vapour, and air in a cylinder in which the charge
is not compressed, whereby the operation of the engine is caused to be practically
noiseless and a high speed can be obtained.
To effect this object I provide two flat slide-valves, having suitable ports for the
admission of gas and air, and for ignition, the said slide-valves working either upon
the end or side of the cylinder. The said valves are actuated directly by two
excentrics, cranks or cams placed on the main shaft of the engine in such positions
relatively to each other as to allow of the proper admission and ignition of the
charge of gas and air, the excentrics, cranks, or cams being connected to the valves
by rods in the ordinary manner. While one slide valve is performing its downward
stroke the other is performing its upward stroke, and thus the opening and closing
of the ignition port is effected in half the time that is required when an ordinary
single slide valve driven by one excentric, crank, or cam is employed. By these
means a rapid and certain ignition of the gaseous charge in the cylinder, and great
increase of speed in the number of strokes of the piston and revolutions of the main
crank shaft are obtained without the aid of springs, levers, or dashpots, thus
reducing the noise in the working of the engine to a minimum.
By my invention I obtain, at every revolution of the main shaft, an early
explosion and expansion of the gaseous charge in the cylinder, so that by the time
the piston reaches the end of its stroke the explosive and expansive force of the
gaseous charge is expended and the exhaust or burnt gases are expelled from the
cylinder by the downward stroke of the piston, through the exhaust-valve, without
noise.
I prefer using for the discharge of the exhaust or burnt gases, a flat mushroom
valve working in a suitable valve-box driven by a cam or excentric on the main
shaft.
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: improvements In Gas motor Co.
I, GEORGE TURNER, of St. Albans, in the County of Hertford, Engineer, do
hereby declare the nature of my invention for "IMPROVEMENTS IN GAS MOTOR
ENGINES," 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 engines of the type known as non-compression gas-
engines," wherein the piston receives an impulse during each outward stroke.
The main object of my said invention is to provide for ensuring an early
explosion and expansion of the gaseous charge admitted into the cylinder during
each outward stroke of the piston, so that, by the time the piston reaches the end
of its outward stroke, the expansive force of such charge will be expended, and the
products of combustion will be expelled from the cylinder through the exhaust
valve by the piston in its return stroke, without noise or with very slight noise.
I thus provide for rendering the engine practically noiseless in its operation, and
for driving the same at a high speed.
I effect this object by employing two slide-valves, placed side by side or face to
face, and operated in such a manner that, while one slide-valve is performing its
inward stroke, the other slide-valve is performing its outward stroke, and vice
versa; the opening and closing of the admission and ignition ports are thus effected
in less time than when an ordinary single slide-valve driven by one excentric,
crank, or cam is employed.
My said invention, moreover, comprises various improvements hereinafter set
forth.
In the accompanying drawings, I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a plan, partly in horizontal section, of a gas-engine constructed
according to the said invention.
Figure 2 is a side elevation of the said engine.
Figure 3 is an end elevation thereof.
Figure 4 is an elevation of one side, and
Figure 5 an elevation of the other side of the outer slide-valve.
Figure 6 is an elevation of one side of the inner slide-valve.
Figure 7 is a side elevation showing the back plate hereinafter described.
Figure 8 is a sidė elevation showing excentrics for actuating the slide-valves,
and
Figure 9 is a sectional elevation shewing the mechanism for actuating the
exhaust-valve.
Figure 10 is a side elevation showing the said excentrics in the positions which
they occupy at the time of ignition.
Figure 11 is a side elevation, and
Figure 12 an end elevation, showing the devices hereinafter described for
adjusting the back plate.
Like letters indicate the same parts throughout the drawings.

page_text: A indicates the base-plate or frame of the engine. B is the cylinder, upon one
side of which is formed a valve-seat B. C is the piston; D is the crank-shaft;
which is connected with the piston by the rod E. F is a port through which the
combustible mixture enters the cylinder as hereinafter set forth.
G is the inner slide-valve, and H is the outer slide-valve. I is the back-plate,
which is attached to the cylinder A, and which retains the valves G, H in place.
The slide-valve G is provided with a single port g, and the slide-valve H is provided
with two ports h, h₁ communicating with the port g and corresponding in shape
with two ports i, in the back plate I. The slide-valve H is also provided with
an ignition port h2 corresponding in shape with the port in the back, plate I.
The port is in communication with the gas supply pipe 3; the port i is in com-
munication with the atmosphere through a valve i*. A pipe is fitted within.the
port to supply gas for the igniting flame.
K, L are two excentrics fixed upon the crank-shaft D, and connected with the
slide-valves G, H by the rods K¹, L¹.
M is the exhaust valve, which is preferably a mushroom valve; it is enclosed in
a chamber N from which extends the exhaust pipe O. The said valve is provided
with a rod or spindle M¹, which is fitted to slide in guide-brackets P, P¹ secured to
the frame A, and which has a fixed collar M². A spring M³ is placed upon the
rod M¹, and bears at one end against the bracket P', and at the other end, against
the collar M². This spring tends to keep the valve M closed.
Qis a cam fixed on the shaft D and arranged to act upon an antifriction roller M⭑
at the end of the rod M', in such a manner that, when the piston has terminated
its outward stroke, the exhaust valve M will be opened by the cam Q and the said
valve will be kept open during the whole, or a greater portion, of the inward stroke
of the piston.
The operation of the improved engine is as follows, viz:-When the piston
moves outward, the valve G is moved outward or forward by its excentric K, and
the valve H is moved inward or backward by its excentric L, so that the ports i,.i¹
are put in communication with the port F through the ports h, 'h'. Air and gas
are then drawn through the ports i, in the back-plate I and through the ports h, h¹
and g in the valves G, H, into the cylinder during about one third of the outward
stroke of the piston. The valve H then cuts off communication between the
ports i, and the cylinder, and the port h2 is uncovered by the slide-valve G, so
that the combustible charge which has been drawn into the cylinder is ignited.
The explosion and expansion of the gaseous charge drives the piston outward, and,
by the time the said piston has terminated its outward stroke, the expansive force
of the charge is expended. The cain Q then opens the exhaust valve M and the
products of combustion are expelled through the pipe O by the piston in its return
stroke.
The above described operation of the valves G, H and M is repeated in every
revolution of the crank-shaft D; therefore an impulse is imparted to the piston
during each outward stroke thereof.
To ensure the closing of the port F, by the valve G, during the inward stroke of
the piston, while the ports h, in the valve H. are in communication with the
atmosphere and with the gas supply pipe, I place the excentric K which drives
the valve G, in advance of the excentric L which drives the valve H, as shewn in
Figure 10. I thus provide for preventing any escape of the products of combustion
into the atmosphere through the port i, or their entrance into the gas supply. pipe ³
through the port ¿'.
I.
To enable the pressure of the back plate I upon the valves G, H to be increased
or diminished at will, I provide the said back plate with four or more adjusting
screws a and lock-nuts b. The said back plate is secured to the cylinder B by
means of two studs c and nuts d, as shown in Figures 11 and 12. By slackening
the nuts b, d and turning the screws a in one or the other direction, the friction
between the surfaces of the said slide-valves and of the back-plate and valve-seat
can be very carefully regulated.

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
First. In a gas-engine, the employment of two slide-valves placed side by side or
face to face and arranged to operate in combination with ports or passages in the
cylinder and in a back plate attached thereto, substantially as, and for the purpose,
set forth.
Second. The provision of means, substantially as above described, for adjusting
the back-plate relatively to the said slide-valves, as, and for the purpose, specified.
Third. The improved gas-engine consisting of the parts constructed and combined
substantially as described with reference to the accompanying drawings and
operating as above specified.