Improvements in or connected with Gas Engines.
Year: 1890

page_text: Date of Application, 29th Oct., 1890
Complete Specification Left, 29th July, 1891-Accepted, 29th Aug:, 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Gas Engines.
I, DAVID MOTTERSHEAD, of Hyde Road, Ardwick, Manchester, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to simplify the working parts and lessen their
number by combining together into one valve all that are required to control the
admission of gas and air; the ignition; and the exhaust.
At the back or at the side of the cylinder I construct a valve chest or chamber
of cylindrical form with two ports leading into the cylinder. Into this valve chest
is fitted a cylindrical valve of plug form and hollow for a portion of its length.
Into this plug is cut preferably four ways or ports two leading into the admission
port of the cylinder and two into the exhaust port.
The two into the admission port are preferably cut into the side of the plug
and communicate with two other ports in the valve chest one of which admits
gas and air and the other connects with the ignition tube. And the two ways
or ports which communicate with the exhaust port of the cylinder are preferably
cut through to the hollow part of the plug which communicates through its end with
an exhaust pipe.
The cylindrical valve chest is preferably made so that any wear occurring in
it or in the plug valve can be taken up or compensated for by means of set
screws or the like.
It is also preferably provided with a water jacket to keep it cool which may
be connected with the water jacket of the cylinder or with the circulating tank:
The valve will be rotated by means of a cog wheel, disc, pulley belt or the like
from the side shaft or other moving part of the engine.
Dated this 27th day of October 1890.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Gas Enginės.
I, DAVID MOTTERSHEAD, of Broom Street, Saint Silas Street, Ashton Old
Road, Ardwick, Manchester, in the County of Lancaster, Engineer, 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:—
This invention is designed with the object of simplifying and reducing the
number of the working parts of a gas engine by combining together into one valve
the several valves that are required to control the admission of gas and air the
ignition and the exhaust.
It consists essentially in a cylindrical valve and valve chest the valve formed
hollow for a portion of its length with three distinct ports or passages through
it and a valve chest with corresponding ports opening into one port in the
cylinder the valve chest being formed with a cut or slit in one side whereby it
can be tightened or closed together to compensate for any wear and tear either
internally or of the valve plug.
It will be fully described with reference to the accompanying drawings in which

page_text: суппает.
Fig. 1, side elevation of engine.
Fig. 2, sectional plan of cylinder and valve and valve chest.
Fig. 3, transverse sectional elevation of cylinder and valve and valve chest on
line - Fig. 2.
Fig. 4, ditto on line y-y Fig. 2.
Fig. 5, ditto on line - Fig. 2.
Fig. 6, longitudinal sectional elevation of valve and valve chest.
Fig. 7, front elevation of face of valve chest for bolting to cylinder.
Fig. 8, front elevation of face on cylinder to which the valve chest is bolted.
Fig. 9, sections of valve showing the relative position of the ports to each other.
The cylinder A with piston B connecting rod.C crank D and fly-wheel E are all
constructed of ordinary form.
To the cylinder I attach a valve chest F with three ports therein abc leading
to a chamber at the back which communicates with the cylinder through the
port d.
A separate port corresponding to each of the ports a b and c may lead into
the cylinder but I prefer to form the chamber into which the three ports open and
only one into the cylinder.
The valve chest F is bored out and into it is fitted a cylindrical valve G of plug
form which is hollow for a portion of its length. It is preferably made of the form
shown hollow at both ends with a division g dividing the two parts though it will
be sufficient if hollow at the exhaust end as the air and gas port can be cut through
it. Into the cylindrical plug valve & are cut four ways or ports a¹ and all through
which the gas and air enter from the gas pipe H and air admission pipe I b¹ which
communicates with the ignition tube J and e' into the hollow centre of the plug
through which the exhaust escapes.
The cylindrical valve chest is made with a cut or slit K which can be closed to
take up any wear or tear occurring in the chamber or in the valve. In order to
secure accuracy of fit the slit is before the hole is bored expanded by means of the
set screws so that as wear occurs and the screws are slackened a perfect fit
between the hole and the cylinder is secured.
The valve chest is also provided with a water space or jacket through which.
water circulates to keep it cool. These spaces L connect with the water spaces M
around the cylinder so that a constant circulation is maintained.
The valve is rotated by the side shaft N which is actuated by the bevel wheel n
on the crank shaft through the wheel n'.
In operation the cylindrical valve makes one revolution for every two strokes of
the piston. Gas and air are admitted through the ports a¹ all in the valve and the
porta in the valve chest to the chamber which is open to the port d of the
cylinder. The gas and air are drawn in for about 60 per cent. of the stroke of
the piston and then cut off and compressed in the cylinder. The ignition port
has by the time the return stroke of the piston has commenced come into the
position shown in Fig. 3 connecting the cylinder port through the port b¹ with
the ignition tube and the explosion then takes place. By the time the piston
has travelled to the end of its stroke the exhaust port c¹ has been brought into
connection with the cylinder port d through the port e and the exhaust escapes
through the hollow end of the cylindrical valve and is conducted away by the
pipe gl.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed 1 declare that what
1 claim is :-
1. A gas engine having a single hollow cylindrical valve provided with admission
ignition and exhaust ports in conjunction with admission ignition and exhaust ports
in an internally cylindrical casing constructed and arranged substantially as
described and shown.

page_text: 2. In a gas engine the combination with a cylinder provided with one port at
the side or end, of a cylindrical valve casing with three ports leading into a
chamber and a cylindrical plug valve hollow at one end with three corresponding
ports which communicate with the air and gas supply the ignition tube and the
exhaust substantially as described.
3. A cylindrical valve and valve chest for gas engines constructed and arranged
substantially as described and shown.
Daten bis 20th day of my 100
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.