Year: 1887

page_text: Date of Application, 25th June, 1887.
Specification Accepted, 26th July, 1887.
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.L.M.E. of the Agency for Foreign
Patent Solicitors, & Lord Street, Liverpool, and 6 Bank Street, Manchester, both in
the County of Lancaster, and 323 High Holborn, in the County of Middlesex, 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 relates to certain improvements in pumps, by means of which their
action will be more certain, and by which disturbances in the mechanism may be
prevented and the interior parts be moreover easily accessible.
For the better explanation of the aforesaid improvements which relate principally
to the air chamber and the valves, the accompanying drawings are annexed, which
show two pumps of different constructions. The one pump is represented in figure 1
in vertical section, in figure 2 in end elevation, (half being in section) and in figure 3
in plan. The other pump is represented in figures 4 to 7, figures 4 and 5 being two
vertical sections, taken perpendicular to each other; figure 6 exterior elevation of
figure 5, and figure 7 plan. Figure 8 shows the cylinder case, the cover being
removed. Referring first to the pump shown in figures 1 to 3, A is the cylinder at
the ends of which the valves B and B are placed. The air-chamber C with the
rising pipe D fixed therein is secured to the cylinder by means of the set screws a a¹.
Into the base E, also secured to the cylinder by means of the set screws bb¹ there
extends beneath the valves B' a compartment F, into which the suction pipe G enters
for a short distance. Under the valves B₁ are short lengths of pipe H descending
into the compartment F. As the plunger 1 advances and returns in the cylinder,
the water is sucked through the pipe G into the compartment F, and from
this compartment through the pipes H and the valves B₁ into the cylinder A.
The water is then forced up through the valves B into the air-chamber C,
whence it is forced up into the rising pipe D. In consequence of the rarefaction
of the air produced in the compartment F, which thus acts as a suction air
chamber, the water is sucked in a continuous [stream from the pipe G. By reason
of the suction pipe G extending some distance above the bottom of the suction
air-chamber F, the water level in the said chamber will, when the pumping is discon-
tinued subside to the line c-d. In the air chamber the water will subside to
the line e-f
This arrangement has the advantage that, when the pumping

page_text: recommences, the plunger will immediately aspire the water in the chamber F, which
water serves to tighten the packing of the plunger and the surfaces of contact of the
valve seats, and at the same time it prevents the air from being aspired through the
pipe D, in the event of the valves B not being perfectly tight. The suction valves B'
have their guides below the valve seats, in order that the inlet area may not be
reduced, the guidance of the valve being besides more certain. The delivery valves B
are, like the previous ones, guided inside in order to occupy the least possible space.
The plunger is worked by means of the shaped lever K, pivoted at the base of the
pump, and by means of a bent link K' which is pivotally connected with the plunger
rod L.
Referring now to the pump shown in figures 4 to 8, all the valves are placed above
the cylinder, the suction air-chamber consists of a pipe N, the lower end of which is
screwed fast in the body of the pump, and over this pipe is passed the delivery
air-chamber 0, which is moreover united with the pipe N by means of a box-
coupling P. By this arrangement the suction air-chamber is placed in the delivery
air-chamber, and the lower part of the latter, which constitutes the lid of the delivery
valve case, is pressed, by means of the box-coupling P against the upper surface of
the pump body, by which means, if packing be laid between the two surfaces, a tight
joint may be produced. The lift of the suction valves Q is determined by the screws R,
introduced through the cylinder covers, whilst the delivery valves S come in contact
with the shoulders & projecting downwards from the air-chamber. The water passes
through the suction pipe T into the compartment beneath the suction valves.
When
the plunger is pushed inwards the water rises through one of the suction valves and
passes through a port U at the end of the cylinder into the latter, and is then forced
through the port U and the delivery valves to the delivery air-chamber and off
through the pipe V. By removing the air-chamber O, free access to all the valves
may be obtained.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1. In a pump a suction air-chamber located beneath the cylinder, and into which
air-chamber the suction pipe protrudes for a short distance in an upward direction,
while pipes from the suction valves protrude to a little below the same level, in a
downward direction, whereby there is always sufficient water left in the air-chamber
to enable the plunger to draw water at its first movement.
2. In combination with the suction valves of a pump, the pipes H leading down-
wards into the suction air-chamber, substantially and as for the purpose described.
3. In a pump a recess constantly filled with water into which dips the delivery
pipe, whereby if the delivery valves be somewhat leaky, during the suction of the
pump, the said water is drawn to them and prevents the leakage of air, substantially
as and for the purpose described.
4. In a pump the combination with a suction air-chamber, consisting of a pipe
communicating with the suction valves, of a delivery air-chamber surrounding the
aforesaid chamber and secured to the body of the pump by a coupling on said
chamber, the screw regulating stops R for the suction valves, and the regulating
stems s of the delivery valves projecting downwards from the delivery air chamber,
all arranged substantially as and for the purpose described.
Dated this 24th day of June 1887