Year: 1887

page_text: EUGENE PRUNIER, Civil Engineer; of No. 3 Deronda Road Herne Hill, London.
S.E. do bereby 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:
The object of my Invention is the production of a pump in which both the exhaust
and delivery are constant.
In my improved pump the jerks, vibrations and ramming to which the ordinary
pumps in which the exhaust and delivery are intermittent are subject, together with
their attendant wear and tear are done away with the result being increased
efficiency, economical working and reduction in the costs of maintenance and
repairs.
This pump, which can be driven by hand or by power, either directly or
otherwise, is principally composed of three cylinders or cylinder casings 6. 7. 8 with
their respective pistons or plungers 4 and of a certain number of check valves 12.
In the accompanying drawing,
Fig. 1 is a vertical longitudinal section through cylinder 7 of an horizontal
pump worked direct from a three cylinder steam engine.
1 is the steam pipe of the steam engines driving the pump.
2 are the steam valve chests.
3 are the steam cylinders.
Fig. 2 is a plan of the said pump.
Fig. 3 is a vertical cross section of the said pump.
Fig. 4 is an enlarged and detailed view of the check valves.
The piston rods of the steam engine are each prolonged through the end covers
of their respective cylinders and terminated with a plunger 4.
The three cranks are set on the crankshaft 5 at an angular distance of
1.20 degrees from each other dividing therefore the circle described by the
crankpins into three equal parts so that in the course of one complete revolution
of one crank pin the motive power is transmitted, through the traction of its

page_text: corresponding piston rod, to one plunger only the two other plungers remaining
idle that is to say doing no duty but merely travelling so as to take the room of
the water displaced by the action of the working plunger.
The action of each plunger alternately succeeds that of the preceding one so
that the water which is exhausted from suction pipe 13 is regularly and steadily
delivered and forced into delivery pipe 14 in a continuous or constant stream.
In the Figs. 1. and 2. the pump is figured in the position in which the plunger
of pump 7 begins to act.
When the said plunger reaches the end of its stroke, the action is taken up by
the plunger of cylinder 8 and, on the latter reaching in its turn the end of its
stroko, by the plunger of cylinder 6, and so on in succession.
The pump casings 6. 7. 8. are coupled together in pairs (6-7, 7-8) the
suction and delivery sides being, in each casing, connected together by means of a
series of apertures 10 made into a diaphragm 11 and provided with check valves 12
which may be of any system.
The air reservoir 15 is only required in the case of the delivery pipe being tapped
in the course of its length.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is
1°. The combination of three or more pumps coupled together in pairs and
provided with their respective plungers driven from cranks set on a common crank-
shaft at equal angular distances from each other and in which, as the result of such a
combination, the water is forced and delivered in a continuous and ininterrupted
stream substantially as hereinbefore described and illustrated.
20. The application, in the construction of pumps of my system, of diaphragms with
apertures provided with check valves and establishing a communication between the
suction and delivery sides of the pumps casings through which the water exhausted
from the original suction pipes successively circulates in order to reach the final
delivery or force pipe substantially as hereinbefore described and illustrated.
London Thirtieth December 1887.