An Improvement in Engines Worked by Compressed Air or other Gaseous Fluid.
Year: 1896

page_text: Date of Application, 21st Mar., 1896
Complete Specification Left, 21st Dec., 1896-Accepted, 21st May, 1897
PROVISIONAL SPECIFICATION.
An Improvement in Engines Worked by Compressed Air or other
Gaseous Fluid.
I, JEAN MOLAS, of 247 High Road, Queen Anne's Avenue, South Tottenham,
in the County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to a simple construction of engine worked by compressed
air or other gaseous fluid.
The cylinder, of which there may be several, is single acting and is fitted with a
plunger connected in the usual way to a crank. At the side of the cylinder near
its end there is an inlet valve opening outwards and having its stem with a rounded
end projecting a little into the cylinder so that as the plunger is approaching the
end of its instroke, its end, which is a little rounded, acting on the valve stem,
opens the valve for a moment admitting a charge of high pressure fluid which
propels the plunger outwards. At the end of the cylinder there is also an exhaust
valve urged by a spring to open inwards. When by expansion the pressure in the
cylinder is so far reduced that the spring can overcome it, the exhaust valve opens,
allowing the fluid to escape, and thereupon the plunger makes its instroke until it
again opens the supply valve admitting a fresh charge, the pressure of which closes
the exhaust valve and again propels the plunger. A second cylinder may be placed
in line with the first, the two together constituting a double acting cylinder,
having an elongated plunger common to both, the middle of which is connected
by slide rods to a pair of cranks.
Dated this 21st day of March 1896.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Engines Worked by Compressed Air or other
Gaseous Fluid.
I, JEAN MOLAS, of 247, High Road, Queen Anne's Avenue, South Tottenham
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 a simple construction of engine worked by compressed
air or other gaseous fluid.
The cylinder, of which there may be several, is single acting and is fitted with a
plunger connected in the usual way to a crank. At the side of the cylinder near
its end there is an inlet valve opening outwards and having its stem with a rounded
end projecting a little into the cylinder so that as the plunger is approaching the
end of its instroke, its end, which is a little rounded, acting on the valve stem,
Price 8d.1

page_text: opens the valve for a moment, admitting a charge of high pressure fluid which
propels the plunger outwards. At the end of the cylinder there is also an exhaust
valve urged by a spring to open inwards. When, by expansion, the pressure in the
cylinder is so far reduced that the spring can overcome it, the exhaust valve opens,
allowing the fluid to escape, and thereupon the plunger makes its instroke until it
again opens the supply valve admitting a fresh charge, the pressure of which closes
the exhaust valve and again propels the plunger. A second cylinder may be placed
in line with the first, the two together .constituting a double acting cylinder,
having an elongated plunger common to both, the middle of which is connected
by side rods to a pair of cranks.
.
Figure 1 of the accompanying drawings is a side view of a double acting engine
according to my invention,
Figure 2 is an enlarged view partly in elevation, partly in section of the double
acting cylinder,
Figure 3 shews in part longitudinal section a modified arrangement of the valves,
and
Figure 4 shews a modification according to which the engine can be used as an
air compressing pump.
As shewn in Figures 1 and 2 two cylinders A, in line with one another, are
fitted with a long plunger B through the middle of which passes a cross pin C
extending through slots in the sides of the junction piece D of the two cylinders A,
and connected by side rods to cranks E. The inlet valve F for compressed air has
a stem with a rounded end projecting slightly into the cylinder A in such a position
that when the plunger B reaches the end of its stroke its slightly rounded end
striking the end of the valve stem causes the valve to open for an instant, admitting
a charge of compressed air into the cylinder. This expands, propelling the
plunger, until the pressure in the cylinder is so far reduced that the exhaust
valve G urged by an adjustable spring opens, allowing the contents of the cylinder
to escape while the plunger makes its back stroke, on the completion of which the
action is repeated.
As shewn in. Figure 3 both the inlet valve F and the outlet valve Gare
arranged in the axial line of the cylinder A. In this case the stem of F is
struck by a screw f adjusted in the end of the plunger B. In both arrange-
ments of valves shewn in Figures 2 and 3, a bent spring b on the end of the
plunger B serves to ensure the closing of the exhaust valve G before the inlet
valve F is opened.
By working the crank E by any suitable power the engine can be employed as
an air compressing pump, but for this purpose, as shewn in Figure 4, the screw f
for opening the valve F is dispensed with, and the spring which acts on the valve G
is arranged so as to tend to keep the valve closed, instead of tending to open it.
The plunger as it makes its strokes draws in air by the valve G and, compressing
it, forces it by the valve F to a suitable reservoir.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what
I claim is :-
An engine worked by compressed air or other gaseous fluid, having its inlet or
admission valve opened by the piston or plunger at the extreme of its instroke and
its exhaust valve opened by a spring when the pressure of the working fluid
in the cylinder is sufficiently reduced by expansion, constructed and arranged
substantially as described.
Dated this 21st day of December 1896
ABEL & IMRAY,
Agents for the Applicant.