Improvements in Triple Expansion Engines.
Year: 1892

page_text: Date of Application, 13th Feb., 1892
Complete Specification Left, 11th Nov., 1892-Accepted, 17th Dec., 1852
PROVISIONAL SPECIFICATION.
Improvements in Triple Expansion Engines.
We, WILLIAM HENRY ALLEN, RICHARD WRIGHT and RICHARD WILLIAM
ALLEN, all of York Street Works, Lambeth, in the County of Surrey, Engineers,
do hereby declare the nature of this invention to be as follows:-
This invention relates to triple expansion engines such as are described in the
Specification of a Patent No. 18629 in the year 1888.
The arrangement is generally vertical. There are two pistons on the same rod,
the smaller above and the larger below; they work in corresponding cylinders and
in the interval between the two pistons there is a trunk.
The high pressure steam is admitted above the smaller piston during a portion of
the down stroke, it expands in this cylinder and at the end of the down stroke is
exhausted into a receiver.
Also during a portion of the down stroke steam is allowed to pass from the
receiver into the larger cylinder above the piston, it expands in this cylinder and
at the end of the stroke is exhausted into a second receiver.
During a portion of the up stroke steam is allowed to pass from the second
receiver into the larger cylinder below the piston, it expands and finally at the end
of the stroke is permitted to pass to the atmosphere or condenser, if a condenser be
employed.
During the down stroke the lower part of the larger cylinder remains open to
the exhaust.
Now according to our invention we effect the distribution of the steam in the
manner above stated by means of a series of piston valves all on one rod and
actuated by one eccentric. There are five of these valve pistons. The space
between the uppermost piston valve and the second piston valve is in communication
with a port by which steam from the boiler enters.
The second piston valve passes over a port leading to and from the top of the
high pressure cylinder; in its descent it uncovers the port for the entrance of
steam and in rising it first closes the port and then uncovers it for the return of
steam from the high pressure cylinder into the first receiver.
The third piston valve in its descent uncovers a port by which steam passes from
the receiver to the top of the larger cylinder; in rising it closes this port and then
uncovers it for the return of steam from the larger cylinder into the second
receiver.
The entrance to the second receiver is by ports in the sides of the valve case
beneath the third valve and also by a passage through the fourth and the fifth
piston valves; this passage is disposed concentrically around the valve rod.
The fifth valve in rising uncovers a port by which steam passes from the second
receiver to the underside of the large piston; in descending the valve first closes
this port and then uncovers it to permit the return of the steam from the cylinder
into the space between the fourth and the fifth piston valves, with which space the
exhaust port or passage to the condenser constantly communicates.
Dated this 19th dex of February 1899
W. H. ALLEN.
R. WRIGHT.
R. W. ALLEN.

page_text: COMPLETE SPECIFICATION.
Improvements in Triple Expansion Engines.
We, WILLIAM HENRY ALLEN, RICHARD WRIGHT and RICHARD WILLIAM
ALLEN, all of York Street Works, Lambeth, in the County of Surrey, Engineers,
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:-
This invention relates to triple expansion engines such as are described in the
Specification of a Patent No. 18629 in the year 1888.
The arrangement is generally vertical. There are two pistons on the same rod,
having a form admitting the use of the said piston for triple expansion as hereafter
described, the smaller above and the larger below; they work in corresponding
cylinders and in the interval between the two pistons there is a trunk.
The high pressure steam is admitted above the smaller piston during a portion of
the down stroke, it expands in this cylinder and at the end of the down stroke is
exhausted into the first receiver.
Also during a portion of the down stroke steam is allowed to pass from the first
receiver into the second cylinder above the lower piston, it expands in this cylinder
and at the end of the stroke is exhausted into a second receiver.
During a portion of the upstroke steam is allowed to pass from the second
receiver into the third cylinder below the piston, it expands and finally at the end
of the stroke is permitted to pass to the atmosphere or condenser if a condenser be
employed.
During the down stroke the lower part of the larger cylinder remains open to
the exhaust.
Now according to our invention we effect the distribution of the steam in the
manner above stated by means of a series of piston valves all on one rod and
actuated by one eccentric. There are five of these valve pistons. The space
between the uppermost piston valve and the second piston valve is in communication
with a port by which steam from the boiler enters.
The second piston valve passes over a port leading to and from the top of the
high pressure cylinder; in its descent it uncovers the port for the entrance of
steam and in rising it first closes the port and then uncovers it for the return of
steam from the high pressure cylinder into the first receiver.
The third piston valve in its descent uncovers a port by which steam passes from
the receiver to the second cylinder; in rising it closes this port and then uncovers
it for the return of steam from the second cylinder into the second receiver.
The entrance to the second receiver is by ports in the sides of the valve case
beneath the third valve and also by a passage through the fourth and the fifth
piston valves; this passage is disposed concentrically around the valve rod.
The fifth valve in rising uncovers a port by which steam passes from the second
receiver to the underside of the large piston; in descending the vaive first closes
this port and then uncovers it to permit the return of the steam from the cylinder
into the space between the fourth and the fifth piston valves, with which space the
exhaust port or passage to the condenser constantly communicates.
In order that our said invention may be fully understood and readily carried into
effect we will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of an engine in accordance with our invention.
Figure 2 is an end elevation of the same.

page_text: another cylinder, the space above the piston we term the second cylinder and that
beneath the piston the low pressure cylinder. cc pistons contained in these
cylinders, d the piston rod, e the connecting rod, the crank shaft. 9'9³9*9ª
and are a series of piston valves all on the same rod 9 which is actuated by the
eccentric h. i is the steam inlet. kis the first or high pressure receiver. I is the
second or low pressure receiver. m is the steam outlet.
In Figures 3, 4 and 5 the cylinders, valves and receivers are marked with
reference letters to accord with the foregoing description.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A triple expansion engine in which by means of a series of piston valves all on
one rod, the steam (or fluid) is first admitted to and expanded in a high pressure
cylinder, thence is passed into a first receiver; thence to the second cylinder where
a second time it is expanded; thence into a second receiver, thence to the low
pressure cylinder where a third time it is expanded and finally is allowed to escape
or to pass to the condenser.
2. Triple expansion engines substantially as herein described.
Dated thin 7th downs
L1000