IMPROVEMENTS IN MOTORS WORKED BY COMBUSTIBLE GAS OR VAPOR
Year: 1885

page_text: I, GILBERT HENRY GARRETT, of 47 West Cumberland Street, Glasgow, in the
County of Lanark, North Britain, Engineer, do hereby declare the nature of my
said invention for "IMPROVEMENTS IN MOTORS WORKED BY COMBUSTIBLE GAS OR
VAPOR," to be as follows, that is to say :-
My said Invention has for its object to economise the combustible gas or vapor
used in motors working therewith, and it is applicable to various kinds of motors
in which the gas or vapor and air are compressed or mixed or passed into or
through a separate cylinder or vessel prior to entering the motor cylinder,
Reference may be made to Clerk's Patent Specification N° 1089 of 1881, as
describing a motor of the kind referred to, and one for which my improvements
are well suited.
One improvement consists in introducing an additional valve, by preference of
the gridiron kind, for the purpose of shutting off the entrance of air and gas
through the check valve through which it is ordinarily drawn in by the action
of the separate pump or displacer cylinder. This additional valve is arranged to
be controlled by the governor, and is closed whenever the governor stops the
supply of gas or vapor, with, the effect of retaining the gaseous mixtures in the
passages and clearances in an unaltered state or nearly so, instead of becoming
diluted by the air which would otherwise be drawn in through the check valve.
A second improvement consists in applying an additional valve in the passage
leading from the separate pump or displacer cylinder to the motor cylinder, this
valve also being arranged to be controlled by the governor so as to be closed and
thereby retain the gaseous mixture in the passage and pump or displacer cylinder,
whenever the governor acts so as to make the motor miss a stroke.
By a third improvement the additional valve described as in the passage leading
from the pump or displacer cylinder to the motor cylinder is arranged (by a con-
nection with the ignition slide or any other suitable moving part of the engine) so.
as to close at every stroke just when the exhaust port or ports become closed, and
thereby prevent the passage of more of the gaseous mixture from the pump or
displacer cylinder and passage to the motor cylinder.

page_text: The two additional valves may be worked by one rod, and may be always
moved into their closing positions by a connection with the ignition slide or other
suitably moving part of the engine; whilst the action of the governor may consist
in the interposition of a hook or detent which prevents the return movement such
return movement being ordinarily caused by a spring or weight.
Dated this fiteanth day of Annil 1005
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Motors Worked by Combustible Gas or Vapor.
:
I, GILBERT HENRY GARRETT, of 47 West Cumberland Street, Glasgow, in the
County of Lanark, North Britain, 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, that is to say :-
My said Invention has for its object to economise the combustible gas or vapor
used in motors working therewith, and it is applicable to various kinds of motors
in which the gas or vapor .and air are. compressed or mixed or passed into or
through a separate cylinder or vessel prior to entering the motor cylinder.
Reference may be made to Clerks Patent Specification No 1089 of 1881, as
describing a motor of the kind referred to, and one for which my improvements
are well suited.
My Invention consists in introducing an additional valve, by preference of the
gridiron kind, for the purpose of shutting off the entrance of air and gas through
the check valve through which it is ordinarily drawn in by the action of the separate
pump or displacer cylinder. This additional valve is arranged to be controlled by
the governor, and is closed whenever the governor stops the supply of gas or vapor,
with the effect of retaining the gaseous mixtures in the passages and clearances in
an unaltered state or nearly so, instead of becoming diluted by the air which would
otherwise be drawn in through the check valve.
A second additional valve may also be applied in the passage leading from the
separate pump or displacer cylinder to the motor cylinder and this valve may also
be arranged to be controlled by the governor so as to be closed and thereby retain
the gaseous mixture in the passage and pump or displacer cylinder, whenever the
governor acts so as to make the motor miss a stroke.
The additional valve for preventing the admission of air and gas is arranged
(by a connection with the ignition slide or any other suitable moving part of the

page_text: engine) so as to close at every stroke just when the exhaust port or ports become
closed.
The two additional valves may be worked by one rod, and may be always moved
into their closing positions by a connection with the ignition slide or other suitably
moving part of the engine; whilst the action of the governor may consist in the
interposition of a hook or detent which prevents the return movement such return
movement being ordinarily caused by a spring or weight.
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings to
be hercinafter referred to and showing the application of my improvements to a
gas motor of the kind described in Dugald Clerk's Specification hereinbefore
referred to.
Figures, 1, and 2, on the accompanying sheet of drawings show in end and side
elevation parts of the gas motor at the end furthest from the crank shaft, with
parts to which my Invention relates in vertical section. Figure, 3, is a vertical
section showing a modification of the valve details.
In the modification shown in figures, 1, and 2, only one of the additional valves
hereinbefore referred to is applied namely the one for checking the entrance of
fresh air and gas it having been found in practice that the other one may be dis-
pensed with without much disadvantage.
:
The additional valve which is a flat horizontally sliding gridiron valve, 10, is
placed a little above the check valve, 11, past which the fresh air and gas enter
the engine, the air entering by the passage, 12, and the gas being supplied by a
pipe, 13, communicating with an annular space, 14, from which holes in the conical
seat of the check valve, 11, admit it when the valve is raised. The additional
valve, 10, works against the under side of a gridiron face and is moved by a rod, 15,
passing out through a stuffing box, another rod, 16, passing out through an opposite
stuffing box serving to assist in guiding it, and having applied to it a helical
spring, 17, for moving it into its open position. The valve rod, 15, is connected
to the lower end of a lever, 18, centered on a bracket, 19, and having adjustably
fixed to its upper end a catch piece, 20, projecting horizontally from it. The upper
arm of the lever, 18, passes through a slot in the ignition slide, 21, and whenever
this slide moves towards the other side of the engine, that is towards the right
hand in figure, 1, it draws over the lever, 18, and thereby makes it move the
additional slide, 10, into its closed position. The slot in the ignition slide, 21, is
elongated so that the slide does not act on the lever, 18, in its return movement,
the spring, 17, moving the additional valve, 10, back unless prevented by the
action of the governor, 22. This governor, 22, acts on a swinging lever, 23, which
is connected to a crank, 24, on a small rocking shaft having on its other end a
lever, 25, which has adjustably fixed to its outer end a catch piece, 26, arranged
for engaging with the catch piece, 20, of the valve lever, 18. As long as the
engine does not exceed the proper speed the catch piece, 20, of the valve lever, 18,
moves to and fro over the governor catch piece, 26, without engaging therewith,
but when the speed becomes too great the lever, 25, is slightly lifted by the
governor action and in consequence when the valve lever, 18, is moved towards
the right hand (figure, 1,) it is prevented from returning by the governor catch
piece, 26.
In the modification of the valve details shown in figure, 3, a gridiron valve, 27,
(hereinbefore referred to as a second additional valve) it applied to close the
passage, 28, by which the gas and air pass from the pump or displacer cylinder
to the motor cylinder. This valve, 27, is connected to the first additional valve, 10,
by studs, 29, passing through slots in the fixed plate up against the face of which
the valve, 10, works; and the two valves are consequently worked by the one
rod, 15. The space between the two additional valves, 10, 27, communicates by
the pipe, 30, with the pump or displacer cylinder.

page_text: 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 introduction in motors worked by combustible gas or vapor of a valve
controlled by a speed governor to prevent the entrance of air and gas past the
check valve when the speed is too great substantially as herein before described.
2. The introduction in motors worked by combustible gas or vapor of a valve
controlled by a speed governor to shut off the communication between the pump or
displacer cylinder and the motor cylinder when the speed is too great substantially
as herein before described.
3. The connecting of a lever working either or both of the valves claimed in
the two preceding claims with the ignition slide or other suitably moving part of
the engine substantially as and for the purposes hereinbefore described.
Dated this twelfth day of January 1886
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