IMPROVEMENTS IN: DOUBLE CYLINDER EXPANSIVE STEAM ENGINES
Year: 1862

page_text: LETTERS PATENT to Joseph Francis Delany and John Charles Raymond
Okes, both of the Victoria Foundry, Greenwich, in the County of Kent,
Engineers, for the Invention of "IMPROVEMENTS IN: DOUBLE CYLINDER
EXPANSIVE STEAM ENGINES."
نان
PROVISIONAL SPECIFICATION left by the said Joseph Francis Delany
and. John Charles Raymond Okes at the Office of the Commissioners
of Patents, with their Petition, on the 28th November 1862.
We, JOSEPH FRANCIS DELANY and JOHN CHARLES RAYMOND OKES, both
of the Victoria Foundry, Greenwich, in the County of Kent, Engineers, do
hereby declare the nature of the Invention for "IMPROVEMENTS IN: DOUBLE
CYLINDER EXPANSIVE STEAM ENGINES," to be as follows:-
This Invention has for its object improvements in doublé cylinder expansive
steam engines. For these purposes the slide valve of-the high-pressure
cylinder of a double cylinder expansive steam engine is made with "lap": at
each end, whilst the slide valve of the low-pressure cylinder is made with no
lap, or with, as little lap as may be. These slide valves are to be worked.or
moved in any suitable manner, but so that the slide valve with the lap may
precede the movement of the slide valve of the low-pressure cylinder.lii!
In some cases, such as where the two cylinders are end to end or otherwise
arranged, the slide valve of the high-pressure cylinder and the slide valve of
the low-pressure cylinder may be moved by the same excentric; and valvė
rod, in which case such valve rod is to be connected to the two valves in such
manner as to admit of its moving the slide valve of the high-pressure cylinder
a distance before it moves the slide valve of the low-pressure cylinder...:

page_text: In cases where two slide valves are used to each of the two cylinders of a
double cylinder expanding steam engine, those of the high-pressure cylinder
are to have lap, whilst those of the low-pressure cylinder are to have no lap,
or as little lay as may be, and they are to be moved or worked in succession,
as above explained.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Joseph Francis Delany and John Charles Raymond Okes in
the Great Seal Patent Office on the 27th May 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOSEPH
FRANCIS DELANY and JOHN CHARLES RAYMOND Okes, both of the Victoria
Foundry, Greenwich, in the County of Kent, Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, Her Letters
Patent, bearing date the Twenty-eighth day of November, in the year of our
Lord One thousand eight hundred and sixty-two, in the twenty-sixth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
us, the said Joseph Francis Delany and John Charles Raymond Okes, Her
special licence, that we, the said Joseph Francis Delany and John Charles
Raymond Okes, our executors, administrators, and assigns, or such others as
we, the said Joseph Francis Delany and John Charles Raymond Okes, our
executors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN DOUBLE
CYLINDER EXPANSIVE STEAM ENGINES," upon the condition (amongst others) that
we, the said Joseph Francis Delany and John Charles Raymond Okes, our
executors or administrators, by an, instrument in writing under our or their
hands and seals, or under the hand and seal of one of us or them, should
particularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be
filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Joseph Francis Delany and John
Charles Raymond Okes, do hereby declare the nature of the said Invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement thereof, that is to say :--

page_text: This Invention has for its object improvements in double cylinder expansive
steam engines. For these purposes the slide valve of the high-pressure
cylinder of a double cylinder expansive steam engine is made with "lap" at
each end, whilst the slide valve of the low-pressure cylinder is made with no
lap, or with as little lap as may be. These slide valves are to be worked or
moved in any suitable manner, but so that the slide valve with the lap may
precede the movement of the slide valve of the low-pressure cylinder.
In some cases, such as where the two cylinders are end to end or otherwise
arranged, the slide valve of the high-pressure cylinder and the slide valve of
the low-pressure cylinder may be moved by the same excentric and valve rod,
in which case such valve rod is to be connected to the two valves in such
manner as to admit of its moving the slide valve of the high-pressure cylinder
a distance before it moves the slive valve of the low-pressure cylinder.
In cases where two slide valves are used to each of the two cylinders of a
double cylinder expanding steam engine, those of the high-pressure cylinder
are to have lap, whilst those of the low-pressure cylinder are to have no lap,
or as little lap as may be, and they are to be moved or worked in succession,
'as above explained.
Having thus stated the nature of our said Invention, we will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figures 1 and 2 shew two longitudinal sections of a double cylinder expan-
sive steam engine, with the valves and valve rod arranged to be worked
according to our Invention. In these Figures the valves are shewn in two
different positions. Figures 3 and 4 shew a section and plan of the valves,
and part of the valve rod separately on a larger scale.
a, a, is the slide rod, which is to be worked by a single excentric or other
suitable instrument. The valve rod a, a, when actuated by its excentric, will
give motion to the two valves in such manner that the slide valve 6 of the
high-pressure cylinder, which has lap, will precede the motion of the valve c
of the low-pressure cylinder, which has no lap. This is accomplished in the
arrangement shewn in the Drawing by the valve rod acting on the valves b, c,
by means of two bridles or frames a³, a³, the bridle or frame a¹ acting on the
valve 6 in such manner as to move it when the excentric moves the valve
rod a, a, whilst the bridle or frame a² of the valve rod is of such dimensions
as to allow the valve rod a, a, with its bridle or frame a³, to be moved a
distance before it acts on and moves the valve c. It should, however, be
stated, that the mode of connecting the valve rod a, a, with the two valves

page_text: may be varied so long as the valve b, which has lap, may be moved a dis-
tance by the valve rod before the valve rod acts on and moves the valve c,
which is made without lap.
Figure 5 shews a side elevation of a double acting expansive steam engine
where the two cylinders are placed side by side, and Figure 6 shews the
arrangement of the valves and valve rods separately on a larger scale. In
this arrangement, as in the previous one, there is only one excentric used
to actuate the valves b and c in such manner that the motion of the valve 6 of
the high-pressure cylinder, which has lap, may precede the action of the
valve c of the low-pressure cylinder, which has no lap. In this arrangement
the bridles or frames a¹, a², fit the parts of the valves they respectively
embrace, so that when the parts of the valve rods a³, a', are acted on in suc-
cession by the rod a, a. The valve b, which has lap, will precede in its
action the valve c of the low-pressure cylinder. This is accomplished by the
cross-head as of the rod a, a, being fixed to the part a³, whilst it is capable of
sliding a short distance on the part a; but it will be evident that the bridles
or frames a¹; a³, of the slide rod might be arranged as before described, and
the cross-head-a affixed to both the parts a³ and a', or the valves may, be
otherwise arranged to be acted on in succession by the rod a, a, which is put
in motion as in the former case by a single excentric or other suitable
instrument.
Having thus described the nature of our Invention, and the manner of
performing the same, we would state that we make no claim to any of the
mechanical parts separately; but what we claim is, the combined arrangement
herein described with reference to Figures 1, 2, 3, and 4 of the Drawings;
and, secondly, we claim the combined arrangement, herein described, with
reference to Figures 5 and 6 of the Drawings.
In witness whereof, we, the said Joseph Francis Delany and John
Charles Raymond Okes, have hereunto set our hands and seals, this
Twenty-second day of May, in the year of our Lord One thousand
eight hundred and sixty-three.
JOS. F. DELANY.
(L.S.)
JOHN C. R. OKES. (L.S.)
JOS. F. DELANY.
(L.S.)
JOHN C. R. OKES. (L.S.)