Improvements in Steam Pumps.
Year: 1887

page_text: Date of Application, 4th Apr., 1887
Complete Left, 4th Jan., 1888
Complete Accepted, 13th Apr., 1888
PROVISIONAL SPECIFICATION.
Improvements in Steam Pumps.
We, WILLIAM CLARKE, Engineer, JOHN BROKENSHIRE FURNEAUX, Engineer, both
of 121, Fenchurch Street, in the City of London, and CHARLES DOWSEN of 5 Deckham
Terrace Gateshead on Tyne Engineer do hereby declare the nature of this invention
to be as follows:
This invention has for its object improvements in steam pumps. In constructing
according thereto a duplex steam pump we arrange two steam cylinders adjacent
and parallel to each other. In these cylinders there are pistons connected by rods
to the plungers of two pump cylinders correspondingly placed in line. The steam
piston of each cylinder is made to form three annular spaces in its length, the
centre space being the steam admission opening and the two outer spaces constituting
exhaust openings. The arrangement is such that steam enters either cylinder first by
the centre annular space of its piston and then passes through a port in the barrel of
this cylinder to either the top or bottom of the other cylinder, the exhaust from this
last named cylinder passing out through another port in the first named cylinder by
the annular exhaust opening in its piston. Thus each piston is made to constitute a
slide valve for distributing steam to the cylinder containing the other piston so that
the use of other valves for this purpose may be dispensed with.
For obtaining a positive steam cushion for each steam piston at each end of its
stroke, we arrange the port at each end of each cylinder a short distance within the
distance covered by the stroke of the piston, but so that the piston covers this port
when at the end of its stroke. With this arrangement the portion of exhaust steam
caught in the end of the cylinder when the piston passes the port forms a cushion.
To admit steam to the outer side of the piston to commence the return stroke and to
supplement the elastic rebound of the cushion either of several means may be adopted.
Thus a small hole can be made through the outer face of the piston and led outwards
into an annular space formed round the part of the piston covering the port at this

page_text: As
end of the cylinder barrel, thus connecting the steam port to the outer side of the
piston. Or instead of the annular space round the piston and the small connecting
hole led therefrom, one or more steam grooves may be formed in the face of the cylinder
barrel from the port to the cushion space, or a small supplementary steam port may
be provided into the cushion space communicating with the main steam passage.
will be obvious, our improvements above stated in effecting distribution of steam and
in obtaining a steam cushion can be applied in compound, triple, or quadruple
compound steam cylinders for actuating steam pumps, and may also be used for
triplex and quadruplex pumps.
ניב
1
1007
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Șteam Pumps.
We, WILLIAM CLARKE, Engineer, JOHN BROKENSHIRE FURNEAUX, Engineer, both
of 121 Fenchurch Street, in the City of London, and CHARLES DOWSEN of 5 Deckham
Terrace Gateshead on Tyne 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 has for its object improvements in steam pumps. In constructing
according thereto a duplex steam pump we arrange two steam cylinders adjacent and
parallel to each other. In these cylinders there are pistons connected by rods to the
plungers of two pump cylinders correspondingly placed in line.
The steam piston of each cylinder is made to form three annular spaces in its
length, the centre space being the steam admission opening and the two outer spaces
constituting exhaust openings. The arrangement is such that steam enters either
cylinder first by the centre annular space of its piston and then passes through.a port
in the barrel of this cylinder to either the top or bottom of the other cylinder, the
exhaust from this last named cylinder passing out through another port in the first
named cylinder by the annular exhaust opening in its piston. Thus cach piston is
mado to constitute a slide valvo for distributing steam to the cylinder containing the
other piston so that the use of other valves for this purpose may be dispensed with.
Fig. 1 is a vertical cross section of a pair of steam cylinders, C being the steam
inlet and A the exhaust outlet, cach being common to both cylinders for its own
purpose.
Fig. 2 is an outside view of the same pair of cylinders.
Fig. 3 is a cross section through line V W in Fig. 1.
Fig. 4 is a cross section through line X Y in Fig. 1.
E and E are steam pistons arranged as shewn to give in each three annular
spaces F F F³ in piston E¹, and F F3 F in piston E²; each annular space being
divided from the next by a flexible spring ring or equivalent device to prevent steam
leakage.
The steam inlet opening C into the cylinder G has a corresponding opening D into
the adjacent cylinder H and the outlet or exhaust opening A in cylinder G is
connected to the two exhaust ports J and K of cylinder G and their corresponding
exhaust ports Land M in cylinder H. The ports N and O near the ends of cylinder &
and the ports P and R near the ends of the cylinder H are each carried to the positions
shewn near the centre of the cylinders' length, but each pair of ports terminate in the
other cylinder; thus N and O terminato (at N' O¹) in the cylinder H and the
ports P and R terminate (at P' R') in the cylinder G.
The action of this arrangement is as follows:-Assume the piston E² to be rising
towards the top in the direction of the arrow, and that when in its mid stroke aš
shewn, the other piston E¹ is just commencing its stroke in the same direction.
Steam is being admitted to the underside of piston E³ through the port R whence it

page_text: comes (through the passage of this port which communicates with the annular space F")
from the inlet opening C.
At the same time exhaust steam is escaping from the upper end of the cylinder H
by means of port P and its passage to the annular space F¹ and out through the
exhaust outlet A.
By the time piston E2 has reached the end of its stroke the plunger E' is arranged
to be at mid stroke and the steam and exhaust openings are then in their reverse
positions and ready for admitting and exhausting steam for the return stroke of
piston through the passage it had been using for the opposite purposes during the
up stroke. Similarly piston E2 opens and shuts and reverses the steam and
exhaust ports for obtaining the desired movement of piston E. The openings T
T2 T3 T T T and T' are for convenience of shaping the various steam, exhaust and
connecting ports opposite to them and are closed when this has been done.
For obtaining a positive steam cushion at the end of each stroke the ports N, O, P, R,
are placed a short distance within the distance covered by the whole stroke of the
pistons but so that the piston covers this port when at the end of its stroke.
With this arrangement the portion of exhaust steam caught in the end of the
cylinder when the piston passes the port forms a cushion. To admit steam to the
outer side of the piston to commence the return stroke and to supplement the elastic
rebound of the cushion either of several means may be adopted. Thus a small hole
can be made through the outer face of the piston and let outwards into an annular
space formed round the part of the piston covering the port at this end of the cylinder
barrel, thus connecting the steam port to the outer side of the piston. Or, instead of
the annular space round the piston and the small connecting hole led therefrom, one
or more steam grooves may be formed in the face of the cylinder barrel from the port
to the cushion space, or a small supplementary steam port may be provided into the
cushion space communicating with the main steam passage.
It will be obvious that by the use of the necessary intermediate receivers the
invention can be applied to compound and quadruple compound steam cylinders.
Having now particularly described and ascertained the nature of the said inven-
tion, and the manner of carrying it into practical effect we declare that what wo
claim is :
1. In a steam pump an even number of steam cylinders with a common steam inlet
and a common exhaust to all, cach cylinder containing a plunger or piston with three
annular passages or spaces around it, one serving as steam passage, and the other two
as exhaust passages to another cylinder, substantially as described.
2. The arrangement of steam cylinders, pistons and passages substantially as
described with reference to the drawings.