Improvements in Pumps.
Year: 1887

page_text: Date of Application, 9th Dec., 1887
Complete Specification Left, 10th Sept., 1888
Complete Specification Accepted, 19th Oct., 1388
PROVISIONAL SPECIFICATION.
Improvements in Pumps.
We, EDWARD BAUDOUIN ELLICE-CLARK, of Connaught Mansions, Victoria Street,
in the City of Westminster, Civil Engineer, and LEONARD CHAPMAN, of Connaught
Mansions aforesaid, Civil Engineer, do hereby declare the nature of this Invention to
be as follows:-
This Invention has for its object to so construct pumps, especially such as are used
for pumping air or gases, that their action is much facilitated as no inlet valves have
to be lifted against their own weight or stiffness as has hitherto been the case.
According to this Invention the piston of the pump works in an inner cylinder or
liner which is of less diameter and less length than the main cylinder of the pump.
The inlet pipe to the pump opens into the space between the liner and the cylinder.
The outlet valve or valves is or are in the cylinder covers or ends, and are so situated
as to be within the space included in the diameter of the liner. When the piston
commences its stroke the liner moves with it until its forward end bears on the
forward end of the cylinder whereby an annular or circumferential opening is left
between the rear end of the liner and the rear end of the cylinder and thus the
pump draws in at the rear side of the piston through the space between the liner
and the cylinder and into the interior of the liner at the rear of the piston by the
continued movement of the piston in the liner, the contents of the liner at the forward
When
side of the piston being at the same time expelled through the outlet valves.
the piston makes its back stroke the liner moves back with it a distance sufficient to
leave a similar annular or circumferential inlet opening between its forward end and
the forward end of the cylinder and to cause the rear end of the liner to bear on the
rear end of the cylinder and the same operations are repeated at the ends of the
cylinder the reverse of those herein before mentioned and so on during the working
of the pump.

page_text: Although we have mentioned the air as being admitted between the interior of
the main cylinder and the exterior of the liner, it will be evident that the air inlet
may be otherwise arranged so as to be closed and opened by the liner after the
manner herein before described.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents for the said Edward Baudouin Ellice-Clark
and Leonard Chapman.
We EDWARD BAUDOUIN ELLICE-CLARK, of Connaught Mansions, Victoria Street
in the City of Westminster, Civil Engineer and LEONARD CHAPMAN of Connaught
Mansions aforesaid, Civil Engineer 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 has for its object to so construct pumps especially such as are used
for pumping air or gases that their action is much facilitated as no inlet valves have
to be lifted against their own weight or stiffness as has hitherto been the case.
We will describe the Invention with reference to the accompanying drawings
whereon Figure 1 is a side view, Figure 2 an end view, Figure 3 a longitudinal
section and Figure 4 a transverse section of a pump made according to this
Invention.
A is the pump cylinder and B is the piston which piston works in an inner cylinder
or liner which is of less diameter and less length than the main cylinder A. The
inlet pipe D to the pump opens into the space between the liner C and the cylinder A.
The outlet valve or valves is or are in the cylinder covers or ends and are so situated
as to be within the space included in the internal diameter of the liner C. In the
drawing we have shown the outlet valves at e e. When the piston B commences its
stroke the liner C moves with it until its lower end bears on the lower end cover of
the cylinder whereby an annular or circumferential opening is established between
the top end of liner and the top end cover of the cylinder as shown at the upper
end of Figure 3 and thus the pump draws in at the upper side of the piston
through the space between the liner C and the cylinder cover and into the interior of
the liner C and by the continued movement of the piston in the liner C the contents

page_text: of the liner at the other side of the piston are at the same time expelled through the
outlet valves. When the piston makes its return stroke the liner moves back with
it a distance sufficient to leave a similar inlet opening between its lower end and the
lower end cover of the cylinder and to cause the upper end of the liner C to bear on
the
upper end cover of the cylinder and the same operations are repeated at the end
of the cylinder the reverse of that hereinbefore mentioned and so on alternately during
the working of the pump.
fare seatings of soft metal or the like for the ends of the liner C to seat
themselves upon.
It will be evident that the inlet need not be in the precise position shown provided
that the inlet passages are closed and opened by the liner after the manner herein before
described. We have described a double acting pump but of course the arrangement
can be applied to a single acting pump.
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 —
First. In pumps the combination with the piston and cylinder of a
operating as an inlet valve substantially as hereinbefore described.
"liner" (C)
Second. A pump arranged as herein before described and illustrated in the
accompanying drawings.
Dated this 10th J
a
1.
1000