Improvements in Pumps, particularly Applicable to Hydraulic Testing Pumps.
Year: 1885

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pumps, particularly Applicable to Hydraulic
Testing Pumps.
I THOMAS IRVING CAMMELL of 6 Nelson Square, Blackfriars in the County
of Surrey, Engineer do hereby declare the nature of said invention for "IMPROVE-
MENTS IN PUMPS PARTICULARLY APPLICABLE TO HYDRAULIC TESTING PUMPS
be as follows:-
"
to
This invention is applicable where a variable supply of fluid or of fluid pressure
is required.
According to this invention I so construct pumps and their connections that time
and trouble is saved in their use while the construction is also simplified and
cheapened. Instead of two separate pumps with their cylinders or barrels valves
and working parts I employ an inner plunger provided with pin or other connection
for connecting to the lever or part for actuating it, and an outer annular plunger
in which the aforesaid inner plunger works and which itself works in a pump
cylinder. By means of suitable projections or recesses or other parts formed or
provided on the body of the pump cylinder and on the inner plunger, and by
means of a corresponding shifting part, catch or lever I connect the outer plunger
with the pump cylinder or with the inner plunger. The pump cylinder is provided
with a set of suitable suction and delivery valves and fixed in a frame or on a tank
in any suitable manner. The mode of using these pumps is as follows: As applied
for instance to ordinary hydraulic testing I in the first instance pump up for
quantity and therefore connect the two plungers, so that the outer one is at work.
When later on a greater pressure is required the two plungers are disconnected,
while by the same action the outer plunger is connected to and held by the pump
cylinder, and I then work with the inner plunger only.
Dated to
"
BREWER & JENSEN,
For the Applicant

page_text: Testing Pumps.
I, THOMAS IRVING CAMMELL of Lyndale House, Cassland Crescent, South
Hackney in the County of Middlesex and formerly of 6 Nelson Square Blackfriars
in the County of Surrey 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 is applicable where a variable supply of fluid or of fluid pressure
is required.
According to this invention I so construct pumps and ther connections that time
and trouble is saved in their use while the construction is also simplified and
cheapened. Instead of two separate pumps with their cylinders or barrels, valves
and working parts I employ an inner plunger provided with pin or other connection
for connecting to the lever or part for actuating it, and an outer annular plunger
in which the aforesaid inner plunger works and which itself works in a pump
cylinder. By means of suitable projections or recesses or other parts formed or
provided on the body of the pump cylinder and on the inner plunger, and by means
of a corresponding shifting part catch or lever I connect the outer plunger with the
pump cylinder or with the inner plunger. The pump cylinder is provided with a
set of suitable suction and delivery valves and fixed in a frame or on a tank in any
suitable manner.
And in order that my invention may be more fully understood and readily
carried into effect I will describe the same with reference to the accompanying
drawings.
Figure 1 is a vertical sectional end elevation and Figure 2 a side elevation of a
pump constructed according to my invention. A is the inner plunger which is
provided with pin B for connecting to the lever for actuating either the inner
plunger A alone or both the inner plunger A and the outer or annular plunger C
in which the inner plunger A works and which itself works in a pump cylinder D.
This latter is provided with a lug or projection D¹ and on a lug C¹ on the outer
plunger is mounted a lever E having its fulcrum thereon and formed with a lug E'
that can catch under the lug D¹ on the pump cylinder D thus connecting the said
outer plunger C with the pump cylinder D. The lever E has also another lug E³
which can catch over the lateral projection A¹ on the joint part of the inner
plunger A. By shifting the lever E into the position shown in dotted lines
Figure 2, the inner plunger A and the outer plunger C become connected, and the
working lever on the pin B will work them together that is to say for low pressure
or for quantity. Or by shifting the lever E by its handle E³ into the position
shown in full lines Figure 2 the outer plunger C becomes fixedly connected with
the pump cylinder D and the working lever on the pin B will then work the inner
plunger A alone that is to say for high pressure or sinall quantity.
In Figures 3 to 8 I have shown another arrangement of double plunger press
pump with only one working lever. Figure 3 being a vertical section through the
upper part of an inner and outer plunger and Figures 4 and 5 plan sections
showing the parts in two different positions.
Figure 6 is a vertical section through a double plunger arrangement specially
suitable for testing by means of air pressure.

page_text: Figure 7 is a front elevation of a hydraulic press fitted with my press pump and
Figure 8 is a plan section of same on line X Y.
In this construction of pump the working lever F has its fulcrum on a ring G
which is free to turn on the body or cylinder D of the pump so that it can be
placed in one of the positions shown in Figures 4 and 5. The inner plunger A has
near its upper end a lug A¹ on two opposite sides, and the outer plunger C
corresponding housings under which the lugs A¹ can be shifted, the motion being
limited by four projections or stops C C C and C+. The outer plunger has also a
lug C on two opposite sides. The body or cylinder D of the pump has on two
opposite sides corresponding housings or stops D¹ D₁ for the lugs C³ C³ on the
outer plunger C. When the working lever fulcruin ring G is in the position shown
in Figure 4 the lugs A¹ are catching in under the housings provided in the top of
the outer annular plunger C and up against the stops C and C. The two plungers
being thus connected the pumping up at low pressure or for quantity can be
proceeded with.
When the working lever fulcrum ring G is pulled round into the position shown
in Figure 5 the lugs A¹ A¹ on the inner plunger A are opposite the slots leading
down to the housings for them on the outer plunger Oso that consequently the
inner plunger A is detached from the outer plunger C and can be worked alone, or
for pressure while the outer plunger C is connected to the pump cylinder D by
reason of the lugs C catching under the housings D¹ thereon. Figure 8 shows the
lever or pump handle F in its two positions.
The lower or piston end a of the inner plung r may as shown in Figure 6 be
made to swivel on the upper part al so that itll not partake of the turning
motion when the handle is shifted from one position to the other. For this
purpose the upper part al is entered sideways into a slot or recess formed in the
lower or piston end a being formed with an enlargement or head as shown.
Similarly the upper part c of the outer annular plunger is entered sideways into a
slot formed in the lower or piston end c¹. The arrangement shown in this Figure
is as stated specially suitable for working with air pressure or vacuum for instance
for testing fluid pressure or vacuum railway brake pipes and connections which
testing may be conveniently done by this construction of pump without having to
connect with the pump on the engine.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that I am
aware that it has heretofore been proposed to construct press pumps with an inner
plunger fitting in an outer annular plunger each having its separate working handle
and capable of being connected by means of a pin, but it will be seen that in my
arrangement there is only one working lever, but what I claim is
First. The means substantially as described and shown for either connecting an
inner press pump plunger with an outer annular plunger when it is desired to
pump up for quantity, or for connecting the outer plunger with the pump cylinder
when it is desired to pump up for pressure and while only one working lever is
employed.
Second. The construction of inner and outer or annular piston adapted to air
pressure or vacuum the lower or piston end of same being capable of freely
swivelling in their upper ends for the purpose of diminishing friction substantially
as described.