IMPROVEMENTS IN GAS MOTOR ENGINES
Year: 1884

page_text: COMPLETE SPECIFICATION.
I JOHN DOUGILL of 83 Choir Street Broughton Lane Manchester in the
County of Lancaster Concretor 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:
The first part of my invention consists of a Governor and Governor Gear
suitable for Gas Motor Engines constructed and arranged as represented in the
drawings accompanying this Specification-Figure 3-Letter a is a Stud upon
which the Sleeve revolves-Letter bis the Sleeve-c. c. are the arms attached
thereto d is a movable socket which is moved one way by the arms and is moved
back by the spring situated within the socket as shown-Out end of the socket
is formed so that it will carry a movable Slide, Letter c, which is moved backwards
and forwards across the end of the socket by and when touched by the finger, f,
Figure 1, fixed upon valve rod, g,. The other end of Slide pushes Gas supply
Valve, letter h, Figure 1, and which may be of any known form. The Governor
is driven direct from crank shaft by a cord or strap and as the speed increases the
arms open out and move the socket along the Stud and thus cause the Slide to
disengage from the finger and consequently the Gas Valve remains closed and in
this way regulates the speed of the Engine-Gas being allowed to pass through
the Gas Valve when the finger engages with the Slide and when Slide and finger
are disengaged the Gas Valve remains closed.
The second part of my invention consists of a Slide Valve suitable for Gas
Motor Engines constructed as shown in Figures 4, 5 and 6-I construct the Slide
Valve of four parts namely:-The Slide Seat, Figure 4, the Slide, Figure 5, the
Lesser Slide, Figure 5, Letter A, and the Slide Cover, Figure 6, Letter B-The
Slide Seat is formed with four ports or passages, the first of these may have two
openings or entrances as shown in Figure 6, Letters c. c, and in larger Valves than
the one shown this first port may have three or four openings yet it must be
called and understood to be the first port-The second and third ports, Figures 4
and 6 marked DD are ports through which gas alone passes, first by way of the
left hand one then through the other into the fourth port which is the air port-
The Gas mixes with the air at this point, then passes along the body of the Slide
Valve through the first port and into the Engine Cylinder, the function of the
second Gas port is to ensure a more perfect mixing of air and Gas than would be
attained if the third port were dispensed with.

page_text: The Slide, Figures 5 and 6, Letter E, is a flat plate with the centre part cut
away and a chamber formed at one end, Letter F, fitted with a burner of the
ordinary kind wherein a small Gas flame burns for the purpose of igniting the
mixture immediately a communication is opened between the chamber F and
the first port in the Valve Seat.-Gas may be supplied to the burner by any mode
[at present] known to Gas Engineers.
The Lesser Slide, shown Figures 5 and 6, Letter A is formed with small cove, G,
which opens and closes ports D D and with the body of the Lesser Slide formed
to open and close, port H, and thus regulate the supply of Gas and air.
The Slide cover is a flat plate which covers the Slides and has a chimney
formed in the back, as shown, Figure 6, Letter I, and kept in position by any
known means.
The movement of the Slides is as follows:-assuming the piston in the engine
cylinder to be at the end of its instroke and just about to move out, the Lesser
Slide is now moved forward in the direction of the crank shaft uncovering
ports D D and H. As the piston moves out, air and Gas flow through the ports
just uncovered along the body of the Slide Valve and through the first port into
the Cylinder, the piston is now one third or thereabouts on its outstroke. The
Slide is then moved in the same direction cutting off the supply of air and Gas
at the first port bringing the ignition flame in Chamber of Slide at the same time
opposite the first port (Figure 6 represents the Slide Valve in this position)
exploding the mixture just admitted and thus propelling the piston forward. The
Slides then immediately return to their original position.
The Slides are moved by cams upon crank shaft, Figures 1 and 2, Letter J,
which cans must be formed in the usual way and in such a manner as to produce
the movement of the Slides according to the description given.
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 Governor and Governor Gear constructed and arranged substantially as
described and shewn.
2 The Slide Valve as set forth described and shewn.
Dated this 15th day of August 1884.
Signed by the said John Dougill
in the presence of
GEO. E. MELLOR,
Solicitor,
With Mr. D. E. Griffiths,
Solicitor, Oldham,
JOHN DOUGILL.