Improvements in Pumps.
Year: 1893

page_text: Date of Application, 15th July, 1893
Complete Specification Left, 16th Apr., 1894-Accepted, 2nd June, 1894
We HARRY HOLT and ALFRED COLLINS of 9, Chapel Street, Berkhampstead,
in the County of Herts, Plumbers do hereby declare the nature of this invention
to be as follows:-
Our invention relates to improvements in the construction of pumps and has for
its object, besides other minor advantages, to prevent what is technically known as
the "hang."
In carrying our invention into practice, we provide an ordinary pump barrel
having an outlet at the side furnished with a forcing valve and an inlet at the
bottom provided with a suction valve.
The barrel is covered at the top with a centrally perforated lid through which
passes a rod extending into the barrel and carrying outside the cover a spiral
coiled thereon. This rod passes at the top and outside the cover through a semi-
circular piece furnished with a leather seating at the bottom, and inside the barrel
through a piston or bucket consisting of a piece of leather or other suitable
material surmounted by a layer of tow, through a block of metal or of wood and
then through another semi-circular piece arranged in an opposite direction to that
of the former, faced with a leather seat at the top and connected to another
piston or bucket the stroke of which is double that of the first mentioned piston
or bucket.
Dated this 15th day of July 1893.
HUGHES, ELI & HUGHES,
76, Chancery Lane, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Pumps.
We, HARRY HOLT and ALFRED COLLINS of 9, Chapel Street, Berkhampstead,
in the County of Herts, Plumbers 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:—
Our invention relates to improvements in the construction of pumps, and has for
object, besides other minor advantages, to prevent what is technically known as
the "hang."
In carrying our invention into practice we have an ordinary pump barrel
provided with an outlet at the middle of barrel, the inlet being from the bottom
of the barrel. Both inlet and outlet may be provided with suitable controlling
valves. The pump rod carries two plungers or pistons, the lower one being
provided with a clack or other suitable valve, and having a stroke which is double
that of the upper one.
To the top of the pump barrel we affix a cover having a
central aperture for the passage of the pump rod and which is provided or not with
a spiral or other spring which acts as a cushion for the upper plunger during the
latter part of the stroke and which further tends to keep the plunger firmly seated
upon the lower actuating collar formed on pump rod. At the commencement
of the stroke the lower piston or bucket travels upwards for a certain distance
by itself (the upper plunger remaining stationary) until in the upward travel
Price 8d.1

page_text: of the pump rod a collar provided thereon comes in contact with the upper
plunger when for the remainder of the stroke the upper valve is carried with it.
After it has arrived at the end of the upward stroke the lower bucket descends
for about one half the stroke by itself when a stop or collar upon the pump rod
carries the uppermost plunger or piston downwards and by this action as hereinafter
more particularly defined what is known as "hang" is entirely prevented and a
continuous flow of the liquid pumped is obtained.
And in order that this our invention may be fully understood and readily carried
into effect we will now describe same with reference to the accompanying sheet of
drawings in which Fig. 1. is a sectional elevation of a pump constructed in
accordance with this invention, and Figs. 2 and 3 similar views but shewing the
plungers at different parts of the stroke.
a is the pump barrel of ordinary construction provided with inlet and outlet
respectively marked a¹ and a upon the drawing. A suitable valve, say the
clack valve b as shewn in Fig. 1 is provided at the inlet a', and a similar valve c
may be provided at the outlet a d is the pump rod to which the piston or
bucket e is attached. In addition to this latter we provide fitting loosely around
the pump rodd a second plunger or piston ƒ which is so arranged as to have only
half the stroke of the piston e. g is a spring arranged under the cover h of the
pump barrel and is for the purpose of forming a cushion for the plunger f. to
take against and moreover to ensure its having a perfect seating upon the collar/'
as shewn in Fig. 2. when at rest at the end of its upward stroke. It will be
seen that the piston or bucket e at the commencement of the stroke travels alone
until the shoulder fon pump rod d reaches the bottom of the plunger f. As the
stroke is continued the plunger f. is raised and travels with the piston or bucket e for
the remaining half of the upward stroke till occupying the relative positions shewn
in Fig. 2.
In the downward stroke the piston e performs half its stroke before the
plunger is actuated which is by means of the stop piece i on pump rod d coming
in contact with the portion f2 of the plunger and carrying same downwards with
it. Fig. 3. shews the bucket e having made half its stroke before the collar i on
pump rod d acts upon the upper side of the plunger f. The downward stroke is
then continued and when completed the relative positions of the two pistons is as
shewn in Fig. 1. and so on at each stroke.
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.
:
1. The improvements in the construction of pumps, substantially as and for the
purposes, hereinbefore described and illustrated.
2. In pumps the combination with the pump bucket e of the second plunger f,
constructed and operating substantially as and for the purposes herein before
described and shewn.
..
3. The combination, and arrangement in an ordinary pump barrel a, of pump
rod d, plungers or pistons e f, spring 9, and valves b. c., all constructed and acting
substantially as hereinbefore set forth, and shewn in the accompanying drawing.
Dated this 16th day of April 1904.
HARRY HOLT.
ALFRED COLLINS:
Hughes, Eli & Hughes,
76, Chancery Lane, London, W.C., Agents for the Applicants."