IMPROVEMENTS IN AND CONNECTED WITH GAS ENGINES
Year: 1884

page_text: I FRANCIS GWYN GRIFFITH of Llansannor House, near Cowbridge, Glamorgan
Engineer do hereby declare the nature of my said invention for "IMPROVEMENTS
IN AND CONNECTED WITH GAS ENGINES" to be as follows:-
According to my invention the main shaft carries a bevil gear which engages
into another gear of equal number of teeth keyed to a shaft which runs at
right angles to the main shaft and reaches to the back end of the cylinder this
shaft carries another bevil gear which actuates a governor of ordinary pattern.
The gas is admitted and the exhaust opened by two cylinder shaped slide valves
which are moved in their turn by two levers connected to them by two short links
these levers are actuated by section plates fixed to two discs carried by a tube
bored to the diameter of the gear shaft on which said tube is fitted to slide, and
one end of the tube is provided with a groove in which the claw of the governor
works. The levers are supported on the upper side of the cylinder cover and the
ends of the levers rest on the section plates when the governor is down.
When the speed of the engine raises the governor the tube slides back and the
ends of the levers then rest on the sliding tube and are not moved until the
governor again lowers.
The two plunger slide valves are moved up and down in a casing slide one being
the gas and air admission valve which is reduced in the middle to form the port
A spring valve is fixed in the gas supply pipe and is opened by the admission slide
valve upon its downward stroke to admit gas into the air chamber from which the
combined air and gas are drawn into the cylinder by the forward stroke of the
piston this continuing until one of levers falls off the section of the disc the slido
valve being then drawn up by the lever and closes the port, this action also liberates
the spring valve in the gas supply and cuts off the gas.
The section plate on the disc of exhaust valve mechanism by raising the lever
pushes down the slide valve and closes the exhaust port.
When the governor is down if the speed of the engine has raised the governor
the sliding tube will be drawn back carrying with it the discs and sections and
allowing the levers to run idle upon the tube, the exhaust port will be then fully
opened and the admission port shut.

page_text: The mixture of air and gas is ignited at the end of the port at the point where
it enters the cylinder. The gas escapes up the chimney tube from the igniting jet
and is ignited by a reigniting jet.
A spindle is made to slide easily in a tube, at one end of the spindle is a disc
valve, at the other adjustable lock nuts. The spindle crosses the chimney tube to
the valve which closes the ignition port. The before mentioned tube slides in an
outer tube or boss projecting from the chimney tube. The inner tube is provided
with jaws between which one arm of an L lever is inserted, the L lever is pivotted
to a support and is operated by a cross lever actuated by a stud on the gear
shaft, by which means the inner tube is pushed in thereby allowing the valve to
open.
The unburnt gas in the chimney tube is drawn in by the suction of the piston
and followed by the flame passes the valve and explodes the charge in the cylinder
the valve being forced back by the explosion.
H. GARDNER,
166, Fleet Street, London,
Agent for the Applicant.

page_text: I FRANCIS GWYN GRIFFITH of Llansannor House, near Cowbridge, Glamorgan,
Engineer, do hereby declare the nature of my said invention for "IMPROVEMENTS
IN AND CONNECTED WITH GAS ENGINES" 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 and connected with gas engines,
whereby the exhaust port is kept full open during the forward and backward
stroke of the piston when the engine attains a too bigh speed, and to the mode of
firing the charge effected in an improved manner.
The annexed drawings clearly illustrate my invention in which drawings
Figure 1 is a side elevation of a gas engine and Figure 2 an end elevation of the
same.
The engine is constructed with a bed A having thereon
connecting rods, slide, cylinder, and piston, flywheel, &c.
the end nearest the crank shaft.
crank, and crank shaft,
The cylinder is open at
A bevil gear wheel B is fixed on the crank shaft C which engages in another
bevil wheel having the same number of teeth and fixed to a shaft D. The said
shaft D carries another bevil wheel E which gears with the bevil wheel F actuating
the governor G.
The mixture of gas and air is admitted to the cylinder and the exhaust port
opened by two cylindrical valves H I shown on an enlarged scale at Figure 3
which are moved in their turn by two levers J, K, Figure 1 connected to them.
The two levers are supported on the upper side of the cylinder K' their ends
resting on two section plates L, M, fixed to two discs NP (see Figure 4) which are
attached to a tube Q the said tube being fitted to slide easily upon the shaft D
and having a groove R at one end in which the claw S of the governor G is
placed.
When the governor is down the ends of the levers J, K, rest on the two section
plates L, M, which are fixed to the discs. The discs revolve with the shaft D and
move the levers J, K, which in their turn move the valves H, I, which open and
close the supply and exhaust ports. The gas and air admission valve is reduced in
the middle to form the port and operates a spring valve fixed in the gas supply
pipe shown at Figure 3.
When the speed of the engine causes the governor G to rise the claw S pulls
back the sliding tube Q carrying with it the discs N, P, out of reach of the
levers J, K, which then not being moved by the section plates L, M, fall upon the
tube Qleaving the exhaust port full open and the supply port shut. So long as
the engine is running at such a speed as to raise the governor sufficiently high for
the section plates L, M, to pass clear of the levers J, K, the exhaust port will
remain full open during the forward and backward stroke of the piston. When
the governor falls the levers are again operated by the section plates.
The mixture of air and gas is ignited at the end of the port at the point where it
enters the cylinder. Figure 5 represents the arrangement for igniting the charge.
A tube T open at the top is fixed to the cylinder cover U and has a projection or
boss V at one side,

page_text: A spindle W is made to slide easily in a tube or plug X,
is a disc valve Y, at the other adjustable locknuts Z.
tube T to the disc valve Y which closes the ignition port.
slides in the projection or boss V.
at one end of the spindle
The spindle crosses the
The said tube or plug X
The gas jet a is placed at the lower end of the tube T, the gas. from which
escapes to the top and is ignited by small jet b placed outside the tube C.
The tube or plug X is provided with rims or jaws between which one arm c of a
lever is inserted, said lever being pivotted to a support and operated by a cross
lever d actuated by a stud on the gear shaft D by which means the tube or plug X
ia pushed in, thereby allowing the disc valve Y to open.
The piston in its forward stroke sucks in the unburnt gas followed by the flame
passes the valve and ignites the charge, the disc valve Y being pushed back by the
explosion.
.
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 construction of gas engines as herein described so that the governor shall
keep the exhaust port full open in the forward and backward stroke when the
engine attains a too high speed.
2. The mode of firing the charge as herein described and shown the operation of
the valve not being entirely dependent upon the quick movement of the lever
which moves the plug but carried in by its own weight and free to shut when the
pressure rises in the cylinder; the gas contained in the lower part of the tube,
passing before the flame slightly improving the charge at that point.
3. The several improvements in and connected with gas engines substantially as
herein before described and shown on the annexed drawings.
ليم
1
T
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