Year: 1887

page_text: Date of Application, 18th June, 1887
Complete Left, 19th Mar., 1888
Complete Accepted, 20th Apr., 1888
I, CHARLES GRANTLEY BEECHEY of 17 York Street, Liverpool, Engineer, do hereby
declare the nature of this invention to be as follows:-
My invention consists of improvements in gas motor engines and relates more
particularly to engines of the character or class described in the Specification of
former Letters Patent granted to me dated 11th March 1885 No. 3199. The main
object of the present improvements is to so arrange the engine that the piston of the
compression cylinder shall complete its instroke before the piston of the working or
power cylinder has completed its instroke whereby plenty of time is afforded to
discharge the gases before closing the communication between the two cylinders and
sufficient lap is obtained between the port and the firing hole in the slide valve to
prevent any liability of the fire passing from the firing hole into the port of
the valve.
I place the compression cylinder at an angle with (and preferably underneath) the
working or power cylinder so that the piston of the compression cylinder will complete
its instroke before the piston of the working cylinder. I employ a slide valve having
a port which effects communication alternately between the air and gas supply pipe
and the compression cylinder, and between the compression cylinder and the working
or power cylinder; and in this slide valve is a firing hole.
In the outward stroke of the compression piston a charge of air and gas is drawn
into the compression cylinder through the slide valve port. In the return stroke of
this piston this charge is discharged through the slide valve port into the charge
chainber of the working or power cylinder; during this time the exhaust port which
is situated in the side of the cylinder at about the centre or middle thereof, is open
until the power piston passes over it; after which the compression of the charge
takes place in the charge chamber. The charge is then fired.
As the piston of the compression cylinder completes its instroke before the piston
of the power cylinder and therefore discharges the combustible charge into the power

page_text: cylinder before the power piston completes its instroke, and as it is not required to
fire the charge before the power piston has completed its instroke, there is time for
the slide valve to close the communication between the two cylinders before the firing
hole comes into communication between the power cylinder and the igniting or
incandescent tube; a lap of ths of an inch more or less can be obtained and thus
any liability of the fire passing into the port of the valve is prevented.
The exhaust valve is opened at the proper time by the same excentric that works
the slide valve, but the exhaust port is closed by the power piston. The exhaust valve
must be closed before the piston passes the exhaust port on its outward stroke.
Dated this 18th day of June 1887.
J. C. MEWBURN,
169, Fleet Street, London,
Agent.

page_text: I CHARLES GRANTLEY BEEOHEY, of 17 York Street, Liverpool, 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:-
My invention consists of improvements in gas motor engines and relates more
particularly to engines of the character or class of those described in the Specification
of former Letters Patent granted to me dated 11th March 1885 No. 3199. One of
the present improvements consists in a mode of so arranging the compression and
working cylinders of the engine that the piston of the compression cylinder shall
complete its instroke before the piston of the working or power cylinder has completed
its instroke whereby plenty of time is afforded to discharge the gases before closing
the communication between the two cylinders and sufficient lap is obtained between
the port and the firing hole in the slide valve to prevent any liability of the fire passing
from the firing hole into the port of the valve. This I effect by placing the compression
cylinder at an angle with the working or power cylinder so that the piston of the
compression cylinder will complete its instroke before the piston of the working
cylinder.
Another of the improvements consists in the employment in gas engines which have
a power cylinder and a compression cylinder of a single slide valve so constructed and
operated as to serve the triple purpose of a valve for the admission of the air and gas
to the compression cylinder, of a valve for the passage of the air and gas from the
compression cylinder to the power cylinder, and as a communication for firing the
charge. This slide valve has a port which effects communication alternately between
the air and gas supply pipe and the compression cylinder, and between the
compression cylinder and the working or power cylinder; and in the slide valve is a
firing hole.
Figures 1 and 2 of the annexed drawings are respectively a side elevation and a
plan both partly in section of so much of a gas motor engine as is necessary to
illustrate my present invention. a is the working or power cylinder and bits piston.
c is a rod jointed at d to the piston b and connecting it to a crank pin e on the disc or
wheel mounted on the driving shaft g. h is the compression cylinder and its piston,
k is a rod jointed at / to the piston i, and connecting it to a piece m which couples
the rod k to the rod c. The two cylinders a and h are placed at an angle to each
other as has been already described, n is the slide valve formed with a port p which
effects communication alternately between the air and gas supply pipe 9 and the
port leading to the compression cylinder and between this port r and the port s of
the power cylinder. is a firing hole in the slide valve, u is an igniting or
incandescent tube, v is the exhaust port which is situated in the side of the cylinder
at or about the centre or middle thereof, w is the exhaust valve which is operated

page_text: through the intermediation of the lever x by the same excentric that works the
slide valve n.
The operation of the engine is as follows:
--
In the outward stroke of the two pistons the compression piston i draws a charge
of air and gas into the compression cylinder h through the slide valve port p, the
slide valve being then in the position seen in the drawings. In the return stroke this
charge is discharged through the slide valve port p into the charge chamber of the
working or power cylinder a the port p being then in communication with the
ports and s; during this time the exhaust port is open until the power piston b
passes over it; after which the compression of the charge takes place in the charge
chamber. The charge is then fired.
As owing to the angle at which the compression cylinder is placed with respect to
the power cylinder the piston of the compression cylinder having a slight lead
completes its instroke before the piston 6 of the power cylinder and therefore
discharges the combustible charge into the power cylinder before the piston completes
its instroke, and as it is not required to fire the charge before the power piston has
completed its instroke there is time for the slide valve to close the communication
between the two cylinders through the ports s, p and r before the firing hole t comes
into communication between the ports of the power cylinder and the igniting or
incandescent tube u; a lap of three-eighths of an inch more or less can be obtained
and thus any liability of the fire passing into the port p of the valve is prevented.
The exhaust valve w is opened at the proper time by the same excentric that works
the slide valve, but the exhaust port is closed by the power piston b. The exhaust
valve must be closed before the piston passes the exhaust port on its outward
stroke v.
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, in respect of gas motor engines, is,―
1. In gas motor engines of the character or class of those described in the
Specification of Letters Patent No. 3199 of 1885, the placing of the compression
cylinder at an angle with the power cylinder so that the piston of the compression
cylinder will complete its instroke before the piston of the power cylinder has
completed its instroke whereby sufficient time is afforded to discharge the air and gas
from the compression cylinder to the power cylinder before closing the communication
between these two cylinders and sufficient lap obtained between the port and the
firing hole in the slide valve to prevent any liability of the fire passing from the firing
hole into the port of the valve, as set forth.
2. In gas motor engines which have a power cylinder and a compression cylinder,
a single slide valve so constructed and operated as to serve the triple purpose of a
valve for the admission of the air and gas to the compression cylinder, of a valve for
the passage of the air and gas from the compression cylinder to the power cylinder
and as a communication for firing the charge, as set forth.
3. The improved gas motor engine constructed and operating as herein before
described and represented in the annexed drawings.
Dated this 17th day of March 1888
J. C. MEWBURN,
169, Fleet Street, London,
Agent.