AN IMPROVED. PUMP
Year: 1878

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "AN IMPROVED.
PUMP." A communication from abroad by Justin Hypolyte Henri Nines, of:
Paris, France.
Sealed the 15th October 1878, and dated the 26th April 1878.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark
at the Office of the Commissioners of Patents on the 26th April 1878.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex
Patent Agent. "AN IMPROVED PUMP." [A communication from abroad by Justin
Hypolyte Henri Nines, of Paris, France.]
This Invention relates to an improved system of double-acting lift and force
pump, applicable as a fire or garden engine, beer pump, and otherwise. The pump
is provided with a special arrangement of clack valves on the outside of the pump
cylinder, and has a double piston on a shaft which receives oscillating motion from
a rock lever operated by hand or other power. The pump cylinder is divided
diametrically into two compartments by two diaphragms, one on either side of the
piston shaft, and in these compartments the two pistons work, thus dividing the
cylinder into four compartments. Two passages on the outside of the cylinder
serve to put the upper and lower compartments in communication. By this system
of pump a double-lifting and forcing action takes place at each stroke of the piston.
The Invention is illustrated, by way of example only, in the accompanying
Drawings, in which,-
Figure 1 shows a front elevation of the pump.
Figure 2, a side view.

page_text: Figure 6 shows a longitudinal elevation and top and under side plans of the upper
diaphragm.
And Figure 7, similar views of the lower diaphragm.
The same letters of reference are used in all these Figures.
a, pump cylinder provided with covers b, c, on opposite sides; d, shaft journalled
in the covers b, c, and to which the double piston e is attached; f, g, diaphragms
(represented on a larger scale in Figures 6 and 7) which divide the pump cylinder a,
in which they are fixed diametrically into two compartments; h, i, are partitions
dividing the water passages j, k, so as to obtain a double-lifting and forcing action;
l, m, lower clack valves; n, o, upper clack valves; p, tail pipe connecting the pump
with a tank or other source of supply; ", lever for working the pump; 8, air vessel
to equalize the flow; t, delivery pipe.
The double piston e is provided with a leather or other packing to prevent leakage
past the piston.
Instead of the clack valves shown india-rubber ball valves or metal valves may
be used.
The following is the action of the pump :-By oscillating the hand lever in the
direction of the arrow 1 the double piston e is oscillated in the direction of the
arrows 2, 3, with the following result: 1st. The water is drawn into compartiments
4 and 7; and, 2ndly, that already contained in compartments 5 and 6 is forced out.
The water raised by atmospheric pressure on the formation of a vacuum by the
piston in compartment 7 passes through tail pipe p, lifts valve l, and passes into
compartment 7 through the aperture u in cylinder a, and into compartment 4
through passage k and aperture v. The water forced by the piston out of compart-
ment 5 passes through aperture x into. passage j, which also receives the water
forced out of compartment 6 through aperture y. The water from both compart-
ments then passes through valve o and out at the delivery pipe t.
On reversing the oscillatory motion of the hand lever r and piston e the suction
will be in compartments 5, 6, and the delivery from compartments 4 7, the clack
valves 1, o, being now closed and the valves m, n, opened. w, z, are flanges at the
edges of the diaphragms f, g.

page_text: being now closed and the valves m, n, opened. w, z, are flanges at the edges of the
diaphragms f, g.
Having described the nature of the Invention, and the manner of performing the
same, I declare that what I claim as the Invention to be protected by the herein-
before in part recited Letters Patent is,-
1st. The general combination and arrangement of parts constituting the improved
double-acting lift and force pump herein shown and described.
2nd. In a pump, the employment in combination of the double oscillating piston,
the peculiarly constructed diaphragms, and the passages outside the cylinder, whereby
a double-lifting and forcing action is obtained at each stroke, as specified.
3rd. The arrangement of the valves on the outside of the pump cylinder above
and below it, as specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Twenty-fourth day of October, in the year of our
Lord One thousand eight hundred and seventy-eight.
A
CLADZ