Year: 1887

page_text: RES
Date of Application, 19th Nov., 1887
Complete Specification Left, 2nd Aug., 1888
Complete Specification Accepted, 28th Sept., 1888
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We THOMAS JEFFERISS of No. 368 Soho Road Handsworth in the County of Stafford
Mechanical Engineer and TANGYES LIMITED of Cornwall Works Soho in the County
of Stafford Engineers do hereby declare the nature of this Invention to be as
follows:-
The said invention has reference to steam pumps of the kind commonly known as
duplex steam pumps that is steam pumps in which the slide valve of one of the steam
cylinders is worked by the piston rod of the other steam cylinder.
In working the slide valves of duplex steam pumps according to the said invention
we construct and arrange the parts of mechanism for that purpose in the following
manner.
On the piston rod of each steam cylinder we fix by cotters or otherwise a tubular
block carrying at right angles a fixed pin or axis. On the said pin or axis a tubular
socket swivels and the cylindrical end of an arm at one end of a cross axis slides in
this socket. The other end of the said axis carries a short arm the two arms and axis
virtually constituting a lever the two arms of which are in different but parallel planes.
The upper short arm of this lever operates the slide valve. As the steam piston of one
steam cylinder travels backwards and forwards it gives a rocking or oscillatory motion
to the long arm of the lever through the swivelling socket and operates the slide valve
of the other steam cylinder in the following manner. The upper and shorter arm of
the said lever is rounded and engages in a slotted opening in the expanded end of the
slide valve spindle. The length of the slotted opening described is greater than the
diameter of the rounded end of the short arm of the lever which engages in it and
consequently there is considerable play in the said parts the lever only operating the
spindle of the slide valve when the steam piston approaches the end of its stroke. The
two arms of the lever described are on opposite sides of the axis carrying them. But

page_text: for convenience of construction we make the arms of one of the levers on the same side
of the axis carrying them that is the short arm of the lever returns instead of continuing
in a line parallel to the long arm. In other words the long arms of the two levers
being vertical the short arms are vertical but one short arm extends vertically upwards
above the axis carrying it while the other short arm extends vertically downwards
below the axis carrying it. Although the two levers are of different lengths the ratio
between their long and short arms is the same. This arrangement of the levers
is convenient with respect to the arrangement of some of the other parts of the
mechanism.
Dated this Nineteenth day of November 1887.
W. T. WHITEMAN,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Working the Slide Valves of Duplex Steam
Pumps.
We THOMAS JEFFERISS of No. 368 Soho Road Handsworth in the County of
Stafford Mechanical Engineer and TANGYES LIMITED of Cornwall Works Soho in the
County of Stafford Engineers do hereby declare the nature of the said Invention and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
-
The said invention has reference to steam pumps of the kind commonly known as
duplex steam pumps; that is, steam pumps in which the slide valve of each of the
steam cylinders is worked by the piston rod of the other steam cylinder.
In working the slide valves of duplex steam pumps according to the said invention
we construct and arrange the parts of mechanism for that purpose in the following
manner.
On the piston rod of each steam cylinder we fix by cotiers or otherwise a tubular
block in a hole in which a fixed pin or axis carried by and at right angles to a tubular
socket swivels and the cylindrical end of an arm at one end of a cross axis slides in the.
swivelling socket. The other end of the said axis carries a short arm the two arms and
axis virtually constituting a lever, the two arms of which are in different but parallel
planes. The upper short arin of this lever operates the slide valve.
The
As the steam piston of one steam cylinder travels backwards and forwards it gives a
rocking or oscillatory motion to the long arm of the lever through the swivelling socket
and operates the slide valve of the other steam cylinder in the following manner.
upper and shorter arm of the said lever is rounded and engages in a slotted opening
in the expanded end of the slide valve spindle. The length of the slotted opening
described is greater than the diameter of the rounded end of the short arm of the lever
which engages in it and consequently there is considerable play in the said parts, the
lever only operating the spindle of the slide valve during a portion of its stroke. The
two arms of the lever described are on opposite sides of the axis carrying them. But
for convenience of construction we make the arms of one of the levers on the same
side of the axis carrying them, that is, the short arm of the lever returns instead of
continuing in a line parallel to the long arm. In other words the long arms of the two
levers are vertical and the short arms are also vertical but one short arm extends
vertically upwards above the axis carrying it while the other short arm extends
vertically downwards below the axis carrying it. Although the two levers are of
different lengths the ratio between their long and short arms is the same. This
arrangement of the levers is convenient with respect to the arrangement of some of the
other parts of the mechanism.
We will now proceed to describe with reference to the accompanying Drawing the
manner in which the said invention is to be performed.

page_text: Figure 1 represents in side elevation; Figure 2 in end elevation (partly in vertical
section) and Figure 3 in plan, a portion of a horizontal duplex steam pump containing
mechanism constructed according to this invention for working the slide valves of
the steam cylinders of the said pump. The mechanism represented for working the
slide valves is situated between the two steam cylinders and the two pump cylinders
of the duplex pump the said mechanism being supported on the connecting piece or
casting a between the said steam and pump cylinders.
The same letters of reference indicate the same parts in the several Figures of the
drawing.
b is the piston rod of one of the steam cylinders of the pump and c is the piston
rod of the other steam cylinder; 62 is the slide valve spindle of the steam cylinder
in which the piston rod b works and c² is the slide valve spindle of the steam cylinder
in which the other rod c works. On the piston rod b a tubular block 63 is fixed and
on the other piston rod c a similar tubular block c³ is fixed; b and c are tubular
sockets having upon them pins or axes b, c at right angles which pins or axes
swivel in holes in the said blocks b, c on the piston rods b, c (see Figure 2). The
rocking levers which are worked from the fixed blocks on the piston rods and the
swivelling sockets b, c and by means of which levers the slide valve spindles b³, C2
are operated at the proper times are constructed as follows.
The lever worked from the swivelling socket 6 for operating the slide valve
spindle consists of the long nearly vertical arm 66 and the short vertical arm b
situated on opposite ends of the horizontal axis 68 working in the long tubular
bearing d carried by the middle casting a of the pump. The bottom of the long
arm of the lever 6, 7, 8 slides in the swivelling socket the bottom of the
said socket constituting an oil cup in which the end of the arm dips and is
lubricated. It will be seen by an examination of Figure 2 that the long
arm 66 of the rocking lever extends upwards to the axis 68 while the short arm 67
on the opposite end of the said axis extends downwards below the axis. By means of
the short arm of the rocking lever the spindle of the slide valve of the steam
cylinder in which the piston rod slides is operated. The other rocking lever worked
from the swivelling socket c on the piston rod c consists of the long arm co sliding in
the swivelling socket ct and the short arm c7 on the opposite ends of the axis c³ working
in the bearing e carried by the middle casting a but the short arm c² by which the
slide valve spindle is operated extends upwards from its axis instead of downwards
as described and represented with respect to the short arm 67 of the lever 66, 67, 68.
The outer ends of the slide valve spindles 62, c² work in the guide bosses f, f on the
ends of the supporting bracket g bolted to the middle casting a. By an examination
of Figures 1 and 3 it will be seen that the ends of the slide valve spindles 62, c² are
expanded and slotted and in the slotted openings the upper and short arms b, c of the
rocking levers work. The length of the slotted opening (see the slotted opening
marked e in Figure 1) is greater than the rounded end of the short arm 67 or c² of
the lever which engages in it and consequently there is considerable play in the said
slot, the lever only operating the spindle of the slide valve during a portion of its
stroke in either direction.
In Figure 1 the slide valve to be worked by the slide valve spindle c³ is marked h.
It will be understood that the piston rods b, c of the steam pistons are moving in
opposite directions during the action of the pump, that is, while the piston of one rod
is making its advance stroke the piston of the other rod is making its reverse or back
stroke.
As the steam piston rods b, c make their respective strokes, a rocking motion is given
in one or other direction to the levers 68, 67, 68 and c, c³, es by the action of the
blocks and c³ on the said rods b, c upon the swivelling sockets and when the
piston, say, of the rod has moved through a portion of its stroke, the short arm 67
of the lever 67 (which has been moving in the slotted expanded end of the slide
valve spindle without acting upon it) strikes against one or other end of the slot
in the expanded part of the spindle and operates the slide valve in the proper direction
and reverses the motion of the steam piston of the rod c. The short arm c' of the

page_text: lever c, c7 acts upon the slide valve spindle and its slide valve and reverses the
motion of the steam piston of the rod in a similar manner. In this way, the slide
valve of each of the steam cylinders of the pump is worked by the piston rod of the
other steam cylinder.
Having now particularly described and ascertained the nature of the said Inven-
tion and the manner in which the same is to be performed we declare that we
claim as the said invention of "Improvements in working the slide valves of duplex
steam pumps":-
Mechanism for working the slide valves of each of the steam cylinders from the
piston rod of the other steam cylinder of the duplex pump consisting essentially of the
two rocking levers 66, 67, 68 and c c7c8, the long arms of the said levers sliding in
swivelling sockets which are operated upon by tubular blocks fixed on the steam piston
rods of the pump and the short arms of the said levers operating the slide valve
spindles of the steam cylinders of the pump, the several parts being constructed
arranged and working substantially as hereinbefore described and illustrated in the
accompanying Drawing.