IMPROVEMENTS IN MACHINERY POR RAISING AND FORCING FLUIDS
Year: 1870

page_text: LETTERS PATENT to Richard Potter Pearn, and Frank Kelsey Pearn,
both of Manchester, in the County of Lancaster, for the Invention
of "IMPROVEMENTS IN MACHINERY POR RAISING AND FORCING FLUIDS."
Sealed the 2nd May 1871, and dated the 12th November 1870.
PROVISIONAL SPECIFICATION left by the said Richard Potter Pearn
and Frank Kelsey Pearn at the Office of the Commissioners of
Patents, with their Petition, on the 12th November 1870..
We, RICHARD POTTER PEARN and FRANK KELSEY PEARN, both of
Manchester, in the County of Lancaster, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN MACHINERY FOR RAISING AND
FORCING FLUIDS," to be as follows:-
Our Invention consists of a double-acting ram pump the plunger of
which works in a packing placed at about the centre of the length of
the cylinder or pump barrel, the cylinder or pump barrel is made in
two parts containing the inlet and outlet passages to the valves, the two
parts of the cylinder or pump barrel are connected together by a fluid-

page_text: tight packing. As the plunger is moved to and fro it draws in and
discharges the fluid from each side through two sets of valves.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Richard Potter Pearn and Frank Kelsey Pearn in
the Great Seal Patent Office on the 11th May 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, RICHARD
POTTER PEARN and FRANK KELSEY PEARN, both of Manchester, in the
County of Lancaster, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of November, in the
year of our Lord One thousand eight hundred and seventy, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said Richard Potter Pearn and Frank Kelsey Pearn,
Her special licence that we, the said Richard Potter Pearn and Frank
Kelsey Pearn, our executors, administrators, and assigns, or such others
as we, the said Richard Potter Pearn and Frank Kelsey Pearn, 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
MACHINERY FOR RAISING AND FORCING FLUIDS," upon the condition (amongst
others) that we, the said Richard Potter Pearn and Frank Kelsey Pearn,
our executors or administrators, by an instrument in writing under our,
or their, or one of our or their hands and seals, 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 Richard Potter Pearn and Frank
Kelsey Pearn, do hereby declare the nature of our said 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) :-
:-
Our Invention consists of a double-acting ram pump the plunger of
which works in a packing placed at about the centre of the length of the

page_text: cylinder or pump barrel, the cylinder or pump barrel is made in two
parts containing the inlet and outlet passages to the valves, the two parts
of the cylinder or pump barrel are connected together by a fluid-tight
packing. As the plunger is moved to and fro it draws in and discharges
the fluid from each side through two sets of valves.
And in order that our Invention may be fully understood and readily
carried into operation, we will proceed to describe the accompanying
Sheet of Drawings, reference being had to the figures and letters
marked thereon.
Fig. 1 is an elevation in section of our improved machinery for raising
or forcing fluids; Fig. 2 is an elevation of the same, and Fig. 3 is a
plan in section shewing the supply and discharge pipes.
•
a is a steam cylinder, the piston rod of which is connected to the
plunger 6; we wish, however, to remark that the plunger may be moved
up and down or to and fro by any arrangement of motive power. The
plunger 6 works in the fluid-tight packing c which is placed in the
upper end of the cylinder or pump barrel d, provided with a lid or
upper portion e, the two parts fitting into each other as shewn in Fig. 1,
and being bolted together, as shewn in Fig. 3. The pump barrel d is
cast with the foundation plate f and the columns g, g, the lower ends of
which are provided with seatings for the admission valves h, h, and
discharge valves i, i, while the upper parts of the columns form air
vessels to keep up a constant flow in the discharge pipe j. The
passage & connects the pump barrel d with the right-hand column g, and
the elbow pipe and passage m connect the upper portion e of the pump
barrel to the left-hand column 9. The pipe 7 passes through a stuffing
box in the upper partition of the passage m. The supply pipe n is in
communication with the fluid to be pumped.
The mode of operation is as follows, and the parts in Fig. 1 are shewn
in the positions they occupy when the plunger 6 is ascending; the fluid
to be pumped is now entering at the right hand end of the supply
pipe n, as shewn by the full arrow, and after passing the valve / it flows
along the passage k to fill the pump barrel d as the plunger ascends, at
the same time the fluid that was above the plunger is being forced
down the elbow pipe into the passage m, and through the valve i into
the discharge pipe j. As soon as the plunger begins to descend the
pressure of the fluid closes the valves and i that had been open and
opens the corresponding valves that had been closed, thereby allowing

page_text: the fluid to enter the supply pipe n at the left-hand side, as shewn by
the dotted arrow, and to escape through the right-hand valve i into the
discharge pipe j. Owing to the peculiar construction of our improved
double-acting pump the gland or stuffing. box c can be repacked with-
out removing any parts of the machine, it is only necessary to unscrew
the bolts by which the upper and lower portions of the pump barrel
are united, the upper portione can then be lifted up to give access to
the packing.
Having thus stated the nature of our Invention, and described the
manner of performing the same, we declare that we claim the improved
mode of constructing and uniting the parts forming the pump barrel, in
which the plunger works, and the elbow pipe forming the communication
between the valves and the pump barrel.
In witness whereof, we, the said Richard Potter Pearn and Frank
Kelsey Pearn, have hereto set our hands and seals, this Ninth
- day of May One thousand eight hundred and seventy-one.
DI
בד.
DOTTED DEADAL
RICHARD POTTER PEAT
-מש.
FRANK KELSEY PEARN.
DAT
(U.S.)
(L.B.)