IMPROVEMENTS IN DOUBLE ACTING PUMPS
Year: 1885

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We ALFRED LE GRAND and ROBERT SUTCLIFF both of 100 Bunhill Row in the
County of Middlesex, Hydraulic Engineers do hereby declare the nature of our
invention for IMPROVEMENTS IN DOUBLE ACTING PUMPS to be as follows:-
or
Our invention relates to the construction of pumping apparatus especially
applicable for deep wells of small bore such as those known as "Artesian"
Abyssinian" Tube Wells and consists essentially in combining two separate
pumps arranged one above the other in such a manner that the water is discharged
into the rising main pipe alternately from the top and bottom cylinders with the
upward and downward strokes of the pump.
For this purpose we employ two cylinders the bottom one being preferably the
smaller in diameter and having at its lower extremity a foot or suction valve, the
upper extremity being jointed to a stuffing box through which the bucket rod
passes; This stuffing box which separates the top and bottom cylinders is formed
with an annular water passage closed on its upper side by means of an annular
valve of India Rubber or other suitable material, thus forming the foot valve for
the top cylinder, and communicating with the outer well or tube through suitable
openings or apertures in the upper part of the bottom .cylinder-The top cylinder
is jointed at its lower extremity to the aforesaid stuffing box, the upper extremity
being secured to the bottom end of the vertical rising main pipe the prolongation
of which extends to the surface of the ground and is connected in the usual
manner to the service main.
Working up and down the inside of the bottom cylinder is a bucket formed of a
hollow vessel, provided with a lifting valve opening inwards and upwards to admit
the water to the interior, the upper part being connected to a hollow vertical
bucket rod which is carried upwards through the stuffing box situated between
the top and bottom cylinders and passed through, and secured to, the annular
bucket of the top cylinder. The upper part of the bucket rod is produced beyond
the bucket of the top cylinder and provided with apertures through which the
water from the bottom cylinder is discharged into the top cylinder and rising
main pipe, the upper extremity being securely attached to a pump rod extending
through the vertical rising main to the surface, and actuated by any suitable means
in the usual manner.
The bucket working in the top cylinder is formed with an annular water passage
closed at its upper side by means of an annular, valve of India Rubber or other
suitable material.

page_text: We ALFRED LE GRAND and ROBERT SUTCLIFF, both of 100 Bunhill Row, in the
County of Middlesex, Hydraulic Engineers do hereby declare the nature of our
invention for IMPROVEMENTS IN DOUBLE ACTING PUMPS and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
Our invention for improvements in double acting pumps relates to the con-
struction of pumping apparatus especially applicable for deep wells of small bore
such as those known as Artesian or Abyssinian tube wells and has for its object to
produce an uniform flow of water or other liquid and thus reduce the strains on
the pump rods.
In carrying our invention into practical effect, two cylinders are arranged one
above the other and their buckets are operated by a single set of rods. The liquid
from the pump is discharged into the main pipe alternately from the top and
bottom cylinder with the upward and downward strokes respectively of the
buckets.
Fig. 1 is an elevation of a pump constructed according to our invention; and
Fig. 2 is a sectional elevation of the same..
The two cylinders a bare joined together by an intermediate stuffing box c
The lower cylinder a is preferably
through which the hollow bucket rod d passes.
smaller in diameter than the cylinder b to compensate for the displacement of the
rod d in the upper cylinder b.
The lower cylinder a is provided with a suction valve e at its lower end and with
a series of small holes f at its top end.
The stuffing box c is formed with an annular water passage closed on its upper
side by an annular valve g of india-rubber or other suitable material This valve g
opens upwards and thus forms a suction valve for the upper cylinder b, the water
or other liquid being drawn in through the holes f.
The upper cylinder is screwed or otherwise jointed at its upper end to the
vertical main pipe p for conveying the liquid away from the pump.
The bucketh working in the lower cylinder a is formed of a hollow vessel
baving an opening at its bottom closed by a lifting valve i opening inwards and
upwards to admit the liquid from the lower cylinder to the interior of the hollow
pipe d which connects the bucket h to the bucket of the top cylinder and to the
pump rod n extending preferably through the main pipe p and actuated by any
Above the bucket, the pipe d is perforated
suitable means in the usual manner.
with small holes o to allow the liquid to pass to the main pipe p. The bucket
working in the top cylinder b is also hollow and is formed with an annular orifice
closed at its upper side by an annular valve m of india rubber or other suitable
material opening upwards to admit of the liquid below the bucket in the upper
cylinder passing to the upper side of the said bucket.
The operation of the pump is as follows:-
Supposing the two cylinders a b to be already charged with the liquid to b
numned and the two buckets h to be at the top of their strokes and just abou

page_text: to descend, the liquid from the lower sides of the two buckets passes through the
valve i, the hollow rod d and holes o and the valve m, respectively, to the main
pipe p, the equivalent amount of liquid below the bucket in the upper cylinder b
merely passing to the upper side of the bucket. On the upstroke of the two
buckets, the upper bucket 1 forces the liquid above it to the main pipe p and at
the same time the two buckets draw a further supply of liquid into the two
cylinders through the valve e and through the holes f and the annular valve g
respectively.
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. In double acting pumps, constructing two separate pumps arranged one above
the other in such manner that their buckets are operated from the same pump rod
and act alternately to discharge the liquid substantially as described.
2. The construction of pump substantially as described with reference to the
drawings.