IMPROVEMENTS IN GAS MOTOR ENGINES
Year: 1885

page_text: I EDGAR CONISTON MILLS of Northwold Dunham Massey Cheshire Mechanical
Engineer do hereby declare the nature of my invention for IMPROVEMENTS IN GAS
MOTOR ENGINES to be as follows:-
=
My invention relates to Gas Motor Engines constructed in accordance with a
part of a former invention for which Letters Patent No 5052 of the year 1879
have been granted to me in conjunction with a certain Henry Haley and in con-
junction with my present invention I also use some portions of my invention for
which Letters Patent were granted to me numbered 5721 in the year 1883.
I place the compressing Pump and the Explosion cylinder in one line and connect
their pistons by a piston rod as described in the Spec" of the invention first
above referred to but I use no separate Reservoir to hold prepared charges for use
in the explosion cylinder as therein also described. Instead thereof I make two
explosion chambers placed between the Pump and the cylinder and I cause the
contents of the said chambers to be fired alternately making free communication
between the explosion chamber and the cylinder at the time of explosion and
during the continuance of the expansive force of the explosion.
In addition to the ordinary pump induction Valve for gas and air, I employ two
delivery valves from the pump one leading to each explosion chamber. These
valves may be controlled by mechanism actuated by a side-shaft revolving at half
the engine speed. They are preferably made in duplicate form and placed centrally
one above or opposite to the other.
To retain the compressed charge in the explosion chambers and to admit it to
the working Cylinder at the right moment I make two similarly constructed valves
opening one from each explosion chamber into a common port or passage which
forms part of the space behind the working piston. These valves are also con-
trolled and operated by a cam and are preferably arranged as described in my
Specification No 5721-1883 and shewn in Fig. 1.
"
For ignition I employ my thimble igniter as described in the same Specification
and shewn in Fig. 7. but no valve as shewn in Fig. 6 (d¹) is required as the main
admission valves open only at the required moment of explosion, when the charge
in entering is at once ignited by coming in contact with the igniter.
The igniter is preferably placed projecting into the above described common port
or passage and as near to the admission valves as practicable.
14LL
1100

page_text: I EDGAR CONISTON MILLS Mechanical Engineer and Draughtsman of Northwold
Altrincham in the county of Chester 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 Gas Motor Engines constructed in accordance with a
part of a former invention for which Letters Patent No 5052 of the year 1879
have been granted to me in conjunction with a certain Henry Haley and in con-
nection with my present invention I also use some portions of my invention for
which Letters Patent No 5721 of the year 1883 were granted to me.
In place of the separate reservoir or vessel of a capacity sufficient to contain a
considerable number of prepared charges as described in my former Specifications
I make two chambers which I call explosion chambers placing them between the
compressing pump and the explosion or working cylinder these being placed on
one centreline with their pistons connected by a piston-rod as described in the
Specification of my former Patent first above referred to and I cause the contents
of the said explosion chambers to be fired alternately making free and open
communication between each explosion chamber and the cylinder at the time of
explosion and during the continuance of the expansive force of the explosion.
And in order that this arrangement may be distinctly understood I refer to the
accompanying drawing.
Fig. I. is a sectional elevation taken through the centre-line of the Engine.
Fig. 1V. is a sectional elevation taken through the centres of the Pump delivery
and cylinder admission valves. (See line x, x Fig. V).
Fig. II is a cross-section taken through centre-line y. y. of the cylinder
admission valves-Fig. IV.
Fig. III. is a cross-section taken through centre-line 32 of the pump delivery
valves-Fig. IV.
Fig. V. is a sectional plan taken through the line w w see Fig. IV.
Fig. VI. is a sectional plan taken through the centre line of the Engine.
Similar figures of reference refer to the same parts in all views.
1 is the working cylinder. 2 is the compressing pump. 3 is the piston rod
connecting their pistons. 4a is one of the explosion chambers. 46 is the other
explosion chamber. 6 is a block carried on the back of the working piston 19 to
fill up the cylinder clearance and expel as nearly as possible all foul gases therefrom
by way of the exhaust outlet 7.
In addition to the ordinary pump induction valve shewn at 8 for gas and air
I employ two delivery valves 9a and 96 from the pump 2 the former delivering
into the explosion chamber 4a and the latter into 46. The spindles 10a and 106
of these valves may be controlled by any suitable mechanism and I shew in Fig. III
one method. The sideshaft 5 geared to run at one balf the speed of the engine
crank-shaft carries cams 11a and 11b. By means of the bellcranks 12a and 126

page_text: carrying rollers at the end of one of their arms and engaging with a trunnion on
the valve spindles at the ends of their other arms the cams keep the delivery valves
to their seats except when it is desired they should open when a depression in the
cams allows this to be effected springs being used if required to assist the pressure
of the outflowing gases to open the valves.
To retain the compressed gases in the explosion chambers and to admit them
to the working cylinder at the right moment I make two valves 13a and 136
similarly constructed and when open effecting communication from 4a and 46
respectively into a common port or passage 14 which is part of or leads into the
space behind the working piston. For constructional purposes and accessibility
the seatings of these valves may be formed upon bushes 15 the gases obtaining
access to the valve apertures through holes or slots 10 in the bushes.
The spindles 17a and 176 of these valves may also be controlled by any suitable
mechanism and I shew in Fig. II one method similar in principle to that hereinabove
described for controlling the pump delivery valves.
For igniting the charge I may use any convenient arrangement as for instance
the "thimble" surface igniter described in my Specification No 5721 1883 and
shewn in Fig. 7 but no valve such as is shewn in Fig. 6 d' in that Specification is
required. For the purposes of my present invention I place the igniter shewn
at 18. Fig. V. projecting into the space 14 and as near as practicable to the
admission valves 13a and 13b.
TR
31
Outstroke:—
Valve 96 being open 9a and 136 closed pump compresses a charge into 4b. An
explosion is taking place in 4a and extending into 1-valve 13a having rapidly
opened at commencement of stroke and remaining open the ignition and expansion
of explosion take place as before. At end of stroke 96 closes.
Instroke :-
Pump draws in gas and air. 46 and 4a and 136 remain closed. 13a closes
gradually. Foul gases are expelled from 1 by exhaust 7.
Thus an impulse of explosion is obtained at every outstroke and the objections
arising from the use of a large storage reservoir of compressed gas and air are
obviated.
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 use and construction of two alternately fired explosion chambers in gas
motor Engines in which the charge is compressed by the action of a pump separate
from the working cylinder substantially as hereinbefore described.

page_text: £5
"
2. The placing of alternately fired explosion chambers in a position between
the pump and working cylinder in gas motor engines of tandem construction
substantially as hereinbefore described.
3. The use and construction of a pair of pump delivery valves one to serve each
of two alternately fired explosion chambers substantially as herein before described.
4. The arrangement of a pair of pump delivery valves concentrically opposite
one another substantially as and for the purposes herein before described.
5. The use and construction of a pair of admission valves to the working
Cylinder opening communication thereto from each of two alternately fired
explosion chambers and remaining open during the out or working stroke sub-
stantially as herein before described.
6. The arrangement of a pair of admission valves concentrically opposite one
another substantially as and for the purposes hereinbefore described.