Year: 1886

page_text: гаргото щодо ди
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HENRY COOPER PRETTY, Engineer, Florence Villa, 103 St. Saviours Road,
Leicester, in the county of Leicester WILLIAM HENRY PRETTY, Engineer Florence
Villa, 103 St. Saviours Road, Leicester, in the county of Leicester, do hereby declare
the nature of this invention to be as follows:-
This invention relates to pumps which may be used for pumping all kinds of
fluids, and applies mostly to pumps used for water for supplying towns, private
houses &c, for drainage and also for sewage of towns, also for emptying ships, for
leakages &c, and generally for pumping all kinds of fluids.
It is claimed that by making pumps in this form, and shape, and on this
principle, that there will be a greater amount of work done, for the work given
out, than is at present obtained, the parts of the pump being made of the most
suitable metal or material upon which the said fluids have the least destroying
action.
The said invention consists of two hollow plungers working in two pump cases or
barrels, the hollow plungers having outside diameters of different sizes, or one is
larger than the other, the end of one hollow plunger being fastened firmly to the
end of the other hollow plunger thus forming one complete plunger.
.
The smaller hollow plunger works in one pump case or barrel, and the larger
hollow plunger works in the other pump case or barrel, the fluid being prevented
from escaping between the hollow plungers and the pump cases, by glands and
stuffing boxes filled with hemp packing, or other suitable material for the purpose.
The hollow plungers are of a length to suit the purpose for which the pump is
required, they are round and as before said they have outside diameters of different
sizes, about one half the length of the complete plunger being of the larger
diameter, and about one half being of the smaller diameter, these diameters are so
arranged as to give a constant flow of the fluid.
The complete plunger is hollow or has a passage through it, through which the
fluid passes, this passage is left as large as possible in area, especially in the smaller
plunger in order to decrease friction, the metal being left strong enough to bear the
strain of working and the pressure of the fluid. Inside the complete plunger there
is a valve which may be placed anywhere in its length. and opening towards the
smaller end of the complete plunger.

page_text: The larger pump case or barrel in which the larger end of the complete plunger
works, has a valve opening inwards or towards the complete plunger, behind this
valve are connected the suction pipes by which the pump draws the fluid, these
pipes may be fixed in a direct line with pump or at an angle to it.
The smaller pump case or barrel in which the smaller end of the complete
plunger works, has a valve opening outwards or away from the complete plunger,
forming a check valve through which the fluid is delivered into pipes which carry
it to its destination, this valve may be a suitable distance from the pump in the
delivery pipe if necessary. This pipe is also either direct or at an angle to pump.
This pump having a backward & forward motion, may be connected to suitable
driving gear by two rods, each connected to a lug or projecting piece on the outside
of the complete plunger, or, by a rod fastened to one end of the complete plunger
by a crossbar, and passing through the end of the pump case or barrel, the fluid
being prevented from escaping by a gland and stuffing box, filled with packing,
sufficient room being left between the end of the plunger and the crossbar to allow
a free passage for the fluid.
The speciality in this pump above all other pumps is in the proper arrangement,
and calculation of the different diameters of the complete plunger.
1000

page_text: We, HENRY COOPER PRETTY & WILLIAM HENRY PRETTY, Engineers, both of
Florence Villa 103 St. Saviours Road Leicester in the County of Leicester do
hereby declare the nature of our 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 pumps which may be used for pumping all kinds of
fluids and applies mostly to pumps used for water for supplying towns, private
houses &c for drainage & also for sewage of towns, also for emptying ships, for
leakage &c and generally for pumping all kinds of fluids.
It is claimed that by making pumps in this form and shape and on this principle
that there will be a greater amount of work done for the work given out than is at
present obtained, the parts of the pump being made of the most suitable metal or
material upon which the said fluids have the least destroying action.
The said invention consists of two hollow plungers working in two pump cases
or barrels. The hollow plungers having outside diameters of different sizes or one
is larger than the other, the end of one hollow plunger being fastened firmly to the
end of the other hollow plunger thus forming one complete plunger.
The smaller hollow plunger works in one pump case or barrel and the larger
hollow plunger works in the other pump case or barrel, the fluid being prevented
from escaping between the hollow plungers and the pump cases by glands and
stuffing boxes filled with hemp packing or other suitable material for the purpose.
is
The hollow plungers are of a length to suit the purpose for which the pump
required they are round & as before said, they have outside diameters of different
sizes, about one half the length of the complete plunger being of the larger diameter
and about one half being of the smaller diameter, these diameters are so arranged
as to give a constant flow of the fluid.
The complete plunger is hollow or has a passage through it through which the
fluid passes, this passage is left as large as possible in area especially in the smaller
plunger in order to decrease friction, the metal being left strong enough to bear the
strain of working and the pressure of the fluid.
Inside the complete plunger there is a valve which may be placed any where in
its length and opening towards the smaller end of the complete plunger.
The larger pump case or barrel in which the larger end of the complete plunger
works has a valve opening inwards or towards the complete plunger behind this
valve are connected the suction pipes by which the pump draws the fluid.
These pipes may be fixed in a direct line with the pump or at an angle to it.
The smaller pump case or barrel in which the smaller end of the complete
plunger works has a valve opening outwards or away from the complete plunger,

page_text: forming a check valve through which the fluid is delivered into pipes which carry
it to its destination.
This valve may be a suitable distance from the pump in the delivery pipe if
necessary.
This pipe is also either direct or at an angle to the pump.
This pump having a backward and forward motion may be connected to suitable
driving gear by two rods, each connected to a lug or projecting piece on the outside
of the complete plunger, or by a rod fastened to one end of the complete plunger
by a crossbar and passing through the end of the pump case or barrel, the fluid
being prevented from escaping by a gland and stuffing box filled with packing,
sufficient room being left between the end of the plunger and the crossbar to allow
a free passage of the fluid.
The specialty in this pump above all other pumps is in the proper arrangement
and calculation of the different diameters of the complete plunger.
This invention will be best understood by reference to the accompanying
drawings.
Figure 1 is a sectional elevation of a vertical pump.
Figure 2 is a sectional elevation of a horizontal pump.
Figure 3 is an elevation of the plunger used in Figure 2.
Figure 4 is a sectional elevation of a vertical pump.
Figure 5 shews a hollow plunger formed in one continuous piece.
Figure 6 shews a plunger with a suitable slot for attaching driving gear.
In Figure 1 A is a portion of the framework of the pump which may be secured
to a wall or other suitable fixture in order to keep the cylinder or pump case or
barrel in a rigid position.
B is the lower or larger hollow plunger working within the cylinder or chamber B¹
and B is the necessary gland and stuffing box, containing suitable packing to
prevent the fluid from escaping between the hollow plunger and the pump case or
barrel. B³ is a valve at the base of the cylinder or pump case B¹.
C is the upper or smaller hollow plunger being preferably half the size and area
of the lower or larger plunger B and working within the cylinder or chamber C¹,
C being the gland and stuffing box similar to B³.
The upper or smaller hollow plunger C and the larger or lower hollow plunger B
are secured through the flanges D by bolts and nuts or other suitable means, thus
forming a complete hollow plunger as before described.
D¹ is a delivery valve which may be fixed at any point within the complete
plunger but preferably at the joint D.
E is a rod having a fork F as shewn which is rivetted or otherwise fastened to
the top of the plunger C, the said rod communicating motion from an engine, hand
crank or other suitable power.
G is a delivery or outflow pipe having flanges at G¹ and securely fastened to
the framework Å and the flanges A¹ of the upper portion of the pump case or
barrel C¹.
G2 is a stuffing box upon the pipe G, through which the puinp rod E passes.
It will therefore be seen that when motion is given to the rod E and it is lifted
in the pump case or cylinder, the fork F with the complete hollow plunger rises to
the top of the smaller cylinder C₁ thereby causing the valve B³ to open so that the
fluid may enter or be drawn into the chamber B¹, when the combined plunger
descends, the valve B³ being closed the fluid forces its way through the larger
hollow plunger B, opens the valve D¹ and escapes through the smaller hollow
plunger C into the upper portion of the cylinder or chamber C¹ and through the
delivery or outflow pipe G to its destination.
Figure 2 embodies the same mechanism and principle as Figure 1 but is shewn
horizontally for purposes of illustration.
Figure 3 is an outside view of the complete plunger shewn in Figure 2 having
a lug or projecting piece L on either side for the purpose of attaching a lever or
other suitable gearing for driving the pump.

page_text: Figure 4 comprises the same mechanism and principle as Figure 2 the dotted
outline shewing a pipe suitably constructed for the attachment of a hosepipe which
may be used for emptying ships and other like suitable purposes.
Figure 5. We may when desirable form the complete hollow plunger of one
entire piece or casting as shewn in Figure 5 and thus dispense with the fastenings
at the joint or shoulder, necessary when two or more pieces are employed.
Figure 6 is a portion of a plunger of two different diameters, having a trans-
verse slot or opening through its diameter for the purpose of applying crank or
other suitable motion.
The pump and its component parts may be constructed of any suitable material
and of dimensions according to the purpose for which it may be required.
We may use wing, mushroom or any other suitable valve for our purpose and
do not confine ourselves to the position or the number of the valves shewn in
the accompanying drawings as these may be altered or varied according to require-
ments. The pump may be set in motion at any convenient point by steam, gas
horse or other suitable power and can be worked vertically, horizontally diagonally
or at any other suitable angle or position.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A pump having one or more complete hollow plungers each of two or more
different diameters substantially as specified.
2. A pump having two or more hollow plungers of different diameters forming
a complete plunger, allowing a free and uninterrupted passage of the fluid through
the saine, substantially as specified.
3. The complete pump substantially as specified.
Dated this 10th day of November 1880.
HENRY COOPER PRETTY.
WILLIAM HENRY PRETTY,
Witness to both signatures,
T. S. SHOULER,
Patent Office,
Market St., Leicester.