Improvements in the Gas Control of an Explosive Gas Motor.
Year: 1896

page_text: Date of Application, 9th Mar., 1896
Complete Specification Left, 9th Dec., 1896-Accepted, 9th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Gas Control of an Explosive Gas Motor.
I, WILLIAM DONALDSON of 38 Parliament Street, Westminster, in the County of
Middlesex, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the better control of the pressure of the gas as and when
admitted to mix with atmospheric air to produce explosion, and consists in improve-
ments for that purpose, whereby the inlet orifice velocity of the gas, drawn in
from the source of supply, together at the same time with the air from the
atmosphere, shall always bear a constant ratio, as far as possible, to that of the air.
This result I seek to effect by minimising the variations of pressure in the gas
main, and further by so controlling the actual orifice of gas admission to the space
between the gas valve and the orifice of admission to the mixing chamber of gas and
air, that the velocity of ingress of the gas bears a constant ratio to the velocity of
ingress of the air.
To carry my invention into effect I employ a receiver between the gas main and
the gas admission valve so as to maintain the pressure on the inlet side of the valve
as constant as possible, even where there is irregularity in the amount of opening
or in the actual closure and opening of the said valve. The said receiver may have
a finely adjustable cock or valve upon the pipe of gas supply from the main, and
a sensitive pressure indicator so that irregularities in the actual pressure in the gas
main may be prevented from seriously affecting the desired uniform pressure in the
receiver. Or, I may introduce an automatically acting reducing valve or governor
between the gas main and the said receiver in order to maintain a constant pressure
in the latter.
Further the inlet valve from the receiver to the mixing chamber is mechanically
operated by a cam on a rotating shaft of the motor, and the periphery of the
cam is so arranged that with a constant pressure in the receiver the inlet valve is
held more or less open according to the suction effort of the indrawing piston of
the gas motor, that the velocity of the gas through the said inlet orifice into the
mixing chamber may bear a constant ratio to the velocity of the air through its inlet
orifice.
D: 71. .
Improvements in the Gas Control of an Explosive Gas Motor.
I WILLIAM DONALDSON of 38 Parliament Street Westminster, in the County of
Middlesex, Civil 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 relates to the better control of the pressure of the gas, as and

page_text: when admitted to mix with atmospheric air, to produce explosion, and consists in
improvements for that purpose, whereby the inlet orifice velocity of the gas dra.vn
in from the source of supply at the same time with the air from the atmosphere,
shall always bear a constant ratio as far as possible to that of the air.
This result I seek to effect by minimising the variations of pressure in the gas
main, and further by so controlling the actual orifice of gas admission to the
space between the gas valve and the orifice of admission, that the velocity of ingress
of the gas bears a constant ratio to the velocity of ingress of the air.
To carry my invention into effect, I empley a receiver between the gas main
and the gas admission valve, so as to maintain the pressure on the inlet side of
the valve as constant as possible, even where there is variation in the amount of
opening, or in the actual closure and opening of the said valve. The said receiver
may have a finely adjustable cock or valve upon the pipe of gas supply from the
main, and a sensitive pressure indicator, so that irregularities in the actual pressure
in the gas main may be prevented from seriously affecting the desired uniform
pressure in the receiver. Or I may introduce an automatically acting re.lucing-
valve or governor, between the gas main and the said receiver, in order to maintain
a constant pressure in the latter.
Further, the inlet valve from the receiver to the mixing chamber, is mechanically
operated by a cam on a rotating shaft of the motor, and the periphery of the cam is
so arranged, that with a constant pressure in the receiver, the inlet valve is held
more or less open, according to the suction effort of the indrawing piston of the gas
motor, that the velocity of the gus through the said inlet orifice into the mixing
chamber may bear a constant ratio to the velocity of the air through its inlet orifice.
And. in order that my invention may be better understood I now proceed to
describe the same in reference to the drawings hereto annexed and to the letters
and figures marked thereon.
Fig. 1 shows in section the combination of my various devices for controlling
the gas supply to an explosive motor, and the mixing of the same with atmosphere,
the devices being developed upon one sectional plan for convenience in showing the
same.
A is the first receiver, taking a supply from a gas main a through a reducing valve b
or through a finely adjustable pressure cock c and having a sensitive pressure
indicator d. The gas from a variable pressure supply from main, is thus reduced in
the receiver A to a uniform pressure; as near that of the atmosphere as possible.
B is a regulating-valve-casing, the valve C being operated to open or partially or
entirely close the exit of the gas from the valve chamber B by a suitable rod Din
guides conveniently dropping by its own weight, and lifted by a cam E, upon a shaft
or counter-shaft of the explosive motor.
This cam E is so arranged as to its periphery that the valve is held more or
less open according to the suction effort of the indrawing piston of the gas motor.
The indraught from the gas motor is from the port F and through the inlet-
chamber F, provided with double inlet valves e e on the same spindle (as an exceptional
check against the explosion running back through the supply chamber and mixer)
and provided also with a safety valve G of large area between the two said inlet
valves e e. Thence the indraught passes through a connecting pipe H of large
diameter, forming a receiver for the mixed gas and air, to a mixer K, which may be
of the construction patented to me under No. 6972 of April 4th 1895 or of any other
known form, in which the gas drawn through an inlet from my regulating valve B,
and the air drawn through any convenient air inlet g is thoroughly mixed by
diaphragms and passages as it passes through the said mixer.
The result of my regulating control of the gas supply in a constant ratio to the
velocity of the air through its inlet, orifice in the mixer, with the after thorough mixture
of the air and gas, held sufficiently long in contact with one another in the mixer and
connection, is to give me a more perfect, uniform and reliable explosive with a
minimum expenditure of gas, than heretofore.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1st. In a gas explosive motor, a control or regulating valve upon the gas inlet,
operated by a cam movement from a shaft of said motor, to always adjust the
opening of the gas inlet orifice under suction draught, so that the velocity of the
gas through the said inlet may bear a constant ratio to the velocity of the air
through its inlet orifice substantially as described.
2nd. In a gas explosive motor, the combination upon the gas inlet pipe of a.
receiver and a finely adjustable cock or automatic reducing valve with a mechanically-
operated orifice-regulating valve, as and for the purposes substantially as described.
3rd. In a gas explosive motor, the combination upon the gas and air inlets; of
a receiver; a finely adjustable cock or automatic reducing valve; a mechanically--
operated regulating-valve upon the gas inlet; a mixing chamber receiving said gas
and an air supply; a receiver of the mixed gas and air; and a double mechanically-
operated inlet-valve of explosive mixture to gas motor; with safety valve of large
diameter, situated between said inlet valves, substantially as and for the purposes.
described.
Dated this 9th day of December 1806
FELL & JAMES,
1 Queen Victoria Street, London, E.C., Agents for the Applicant...