Improvements in Pumping Devices.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pumping Devices.
I, HEDLEY OLIVER, of St. Benet's Chambers, Fenchurch Street, in the City of
London, Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to pumping devices and has for its object the provision
of means whereby the suction valve of the pump is operated positively by the
action of the rod or other device which drives the forcing piston or plunger, so that
a more efficient and positive pumping action is produced compared with devices
hitherto known.
To carry my invention into effect I form the piston rod hollow and I slidingly
mount the piston upon this said rod. At the inner end of the piston rod I fix a
valve device having a surface or surfaces for making a joint which co-act with
one or more seatings disposed or formed on the body of the piston. The delivery
passage through the piston rod is controlled by a ball or other automatic valve
while the other valve arrangement in the piston is arranged to control a passage
of communication through the piston from one side to the other, the piston rod
side of the piston being continually in communication with the supply. The pump
is single acting that is to say only delivers during the stroke in one direction while
it draws in a fresh charge during the stroke in the other direction.
The device operates as follows:-When the pump is performing a compression
stroke the piston rod is slid into the piston a small distance, closing the valve con-
trolling the communication between the back and front sides of the piston, while
the air in the cylinder under pressure opens the delivery valve. At the end of the
stroke, the piston body remains stationary while the piston rod and suction valve
attached thereto move relatively to the piston whereby communication is set up
between the front and back of the piston so that during this stroke displacement
takes place from the back to the front of the piston through the passages made
therethrough.
In this way it will be obvious that the action of the suction valve is positively
operated by the piston.

page_text: ner the same is to be performed to be particularly described and ascertained in
and by the following statement:
-
This invention relates to pumping devices and has for its object the provision
of means whereby the suction valve of the pump is operated positively by the
action of the rod or other device which drives the forcing piston or plunger so that 5
a more positive and efficient pumping action is produced and the amount of clear-
ance between plunger and cylinder end is reduced to a minimum compared with
devices hitherto known.
In order that my invention may be the better understood, I will now proceed
to describe the same in relation to the accompanying drawings hereunto annexed 1
reference being had to the letters and figures marked thereon. Like letters refer
to like parts in the various figures.
Figure 1 is a sectional elevation of a pump according to my invention showing
the position of piston and valves at the completion of a compression stroke..
Figure 2 is a similar view showing the position of those parts during the suction
stroke.
Figure 3 is a plan of the piston.
Figure 4 is a part sectional elevation of a modified construction to that shown
in Figures 1 and 2, the piston rod in this case being hollow and forming the
delivery exit from the cylinder.
To carry my invention into effect, I arrange within a cylinder or pump barrel A
a piston B having a cup leather C or other equivalent packing and I mount this
piston B slidingly upon the piston rod D. At the inner end of the rod D I fix
a valve E having a suitable surface for making a joint with a seating F attached
to or formed with the piston which is hollow and of such a form as to contain
the valve. The valve E has a shoulder to coact with the top part of the piston
so as to operate the latter during the suction stroke.
The delivery passage G is controlled by a ball or other automatic valve H which
in the drawing is shown supported by a spiral spring and the valve E controls the
passages of communication J through the piston from one side to the other, the
piston rod side of the piston being continually in communication with the supply
which enters through orifices K in the cover L. The pump is single acting that
is to say only delivers during the stroke in one direction while it draws in a fresh
charge during the stroke in the other direction.
In Figure 4 it will be seen that the piston rod D is formed hollow and the
delivery valve H is carried within the piston rod; thus the piston rod forms the
delivery exit from the cylinder.
The device operates as follows:-When the pump is commencing to perform a
compression stroke the piston rod D is slid into the piston B a small distance,
closing the valve controlling the communication between the back and front sides
of the piston, while the air in the cylinder under pressure opens the delivery
valve H at the end of the stroke the piston body remains stationary while the
piston rod D and suction valve E attached thereto move relatively to the piston
body thus setting up communication between the front and back of the piston, so
that during this stroke displacement takes place from the back to the front of the
piston through the passages J.
In this way it is obvious that the action of the suction valve is positively operated
by the piston.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
1
1st. A pump in which the piston or plunger is slidingly mounted upon the
piston rod or other operative means, the suction valve is carried by the piston rod
and adapted to coact with a seating upon the piston and a passage or passages
provided through the piston controlled by said suction valve, substantially as
described.

page_text: 2nd. The construction and arrangement of a pumping device substantially as
described and illustrated in and by the accompanying drawings.
D
1
171 .
1000
FELL & JAMES,
Agents for the Applicant,
1, Queen Victoria Street, London, E.C.
FELL & JAMES,
Agents for the Applicant,
1, Queen Victoria Street, London, E.C.