Year: 1888

page_text: I, JOHN CHARLES RAYMOND OKES, of 39 Queen Victoria Street, London, in the County
of Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows
-
In duplex pumping engines of that class in which the valve of one motor cylinder
15 actuated by a lover attached to the piston rod of the other motor cylinder, and uce
versa, as usually constructed, defects of a serious nature exist, viz, that the length of
stroke of the piston is necessarily short, which prejudicially interferes with the
efficiency of the pump for long suction draught, and also that the length of stroke
varies considerably with the load, thus the stroke, already too short, is frequently
greatly reduced in length, thereby entailing great waste of steam or other motive
Haid employed
Now the object of the present invention is to obviate these defects, and also to
construct a duplex pumping engine or motor simpler in form and of cheaper con-
struction, while rendering all working parts more accessible
For this purpose it consists essentially in the employment of a separate recipro-
cating rotary valve for each motor cylinder, such valves governing suitable supply
and exhaust ports and being actuated directly by the movement of the pistons in the
motor cylinders, the piston of one cylinder controlling the supply and exhaust of
steam or other fluid to the other cylinder and vice versa
The reciprocating movement may be imparted to the valves in any convenient
manner, a suitable arrangement consisting in securing an arm to the piston rod and
causing same to project through a groove or slot formed in a sleeve or tube mounted
on and controlling the valve spindle of the other cylinder, such slot being formed
with inclines in opposite directions, so that when the arm at one part of the piston
stroke bears against and acts upon one of the inclines of the slot in the tube, it will
cause the latter to rotate carrying the valve spindle on which it is mounted and
consequently the valve with it through an arc of a circle sufficient to reverse the
valve On the return stroke of the piston the arm mounted on its rod will bear

page_text: against and act upon the other incline of the slotted tube carried by the valve
spindle, and as such incline is in the opposite direction the valve will be caused to
return to its originil position
It will thus be seen that the reversal of the valve will be effected quickly just on or
near the completion of the backward and forward strokes, and (as above stated) the
movement of one piston controls the valve of the other cylinder, so that the arm on
cach piston rod must engage the slotted tube on the valve spindle of the other
cylinder
Instead of the arm projecting through the slot, it may be provided with rollers to
engige therein
Instead of the arrangement above described the arm on the piston rod may be
connected by rod having a lost motion to a lever mounted on the valve spindle, in
which case the is of the valve will be arranged in a plane it right angles to that of
the cylinders instead of parallel therewith as in the former case Again, instead of
the irm on the piston rod being connected by a rod to the valve spindle lever, it may
be caused to act upon tappets on such rod, and thus actuate the valve quickly in
opposite directions on the completion of the forward and backward strokes of the
piston rod to which it is secured
It will be readily understood that the improved motor described might be applied
to other purposes than for pumping, such for example as for working bellows, or for
other purposes of a similar nature
T

page_text: Improvements in Duplex Pumping Engines and Motors
I, JOHN CHARLES RAYMOND OKES, of 39 Queen Victoria Street, London, in the County
of Middlesex, 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
In duplex pumping engines of that class in which the valve of one motor cylinder
Is actuated by a lever attached to the piston rod of the other motor cylinder, and ce
tersa, as usually constructed, defects of a serious nature exist, viz, that the length of
stroke of the piston is necessarily short which prejudicially interferes with the
efficiency of the pump for long suction draught, and also that the length of stroke
varies considerably with the load, thus the stroke, already too short, is frequently
greatly reduced in length, thereby entailing great waste of steam or other motive
Huid employed
Now the object of the present invention is to obviate these defects, and also to
construct a duplex pumping engine or motor simpler in form and of cheaper con-
struction, while rendering all working parts more accessible
For this purpose it consists essentially in the employment of a separate recipro-
cating rotary valve for each motor cylinder, such valves governing suitable supply
and exhaust ports and being actuated directly by the movement of the pistons in the
motor cylinders, the piston of one cylinder controlling the supply and exhaust of
steam or other fluid to the other cylinder and vice versa
In the accompanying drawings,
Fig 1 is an end view partly in section
Fig 2 a transverse section, and
Fig 3 a longitudinal section, of a duplex pumping engine embodying my
invention
A, A³, are the cylinders, and B, B¹, the reciprocating rotary valves
the
The piston rods C, C", each carry an arm D, D¹, while the valve spindles E, E¹,
each carry a slotted sleeve F, F¹ "The arms D, 'D', are forked and pass on each side
of the sleeves F, F, so as to form suitable bearings for rollers f,f¹, engaging
slot in the sleeves F, F¹ The slot in each sleeve is of cam form, so that, as the
piston rods C, C³, reciprocate, carrying with them arms D, D', the rollers mounted in
the latter will cause the sleeves F, F, to turn and thus reverse the valves B, B', the
slot being so shaped that the piston rods may travel a portion of their stroke without
causing any motion of the reciprocating rotary slide valves, and then effect the
reversal at the proper moment It will be seen that the piston-1 od C of cylinder A
carries the rod Df for actuating the valve B¹ of cylinder A', while piston rod O' of
cylinder A¹ carries the rod D for actuating the valve B of cylinder A.

page_text: Figs 4 and 5 show a modification in which instead of the arms D, D¹, being forked
and having rollers f,f¹, engaging the cum slots in the sleeves F, F¹, such arms thom-
selves engage the cam slots in such sleeves, the arms being preferably bevelled as
shown at the points where they pass through the slots
Fig 6, shows one form of cam slot in the sleeve F such slot having an incline g in
the centre of its length, while its two ends are straight
Fig 7 shows another form of cam slot provided with inclines h, h¹, in reverse
directions formed at opposite ends, and with which the arm D comes alternately into
contact as it reciprocates with the piston rod to which it is secured
In Figs 8, 9, 10 and 11 a different method of actuating the reciprocating rotary
valves B, B', is shown In this case the valves are arranged at right angles to the axis of
the cylinders instead of parallel thereto, and the outer ends of the arms D, D¹, carried
by the piston rods C, C, slide along rods G, G², having abutments or stops H, H', so
that when arms D, D¹, come in contact with either of such stops they move the
rods G, G¹, with them, in the direction of which the arms are travelling The
rods G, G¹, are respectively secured to arms I, I', mounted on the valve spindles E, E¹,
so that the movement of the rods will be transmitted to the valves, thus reversing
same at the required times
Figs 10 and 11 show the right and left hand valves for above arrangement
Figs 12, 13, 14, 15 and 16, show further modification, in which the valves B, B¹,
are also arranged at right angles to the axis of the cylinders (as in the last described
arrangement) but are contuned in a single valve chest
In this arrangement the outer end of arms D, D¹, are secured to (instead of
sliding along) the rods G, G³, and the latter carry rollers K, K¹, which is the
rods G, G¹, reciprocate with the piston rods C, C¹, act upon tippets L, LI,
mounted on the valve spindles, and so reverse the ilves B, B₁, at the proper
times
Figs 12, 15 and 16 show how the valve spindle of the valve on one side is
carried through the other valve For this purpose the end of each valve spindle
18 forked as shown at M, M², and its two arms pass through slots m, m³, formed
in one valve, and are then secured to the other vilve, such slots being of suffic ent
length to enable each spindle to turn through the necessary arc of a circle required
to revorso its valve, without actuating the other valve through which its arms M pass
By this means the motion obtained on one side 19 crossed over so as to actuate the
valve on the opposite side Instead of thus crossing the motion, as above described,
the parts leading to the opposite cylinders might be crossed if desired
Instead of the rollers K, K₁ being mounted on the rods G, G³, they might be
mounted one on each end of each of the tappets L, L', and a projection on the rods be
caused to act upon such rollers as the rods are reciprocated
It will be readily understood that the improved motor described might be applied
to other purposes than for pumping, such for example as for working bellows, or for
other purposes of a similar nature
Having now particularly described and ascertained the nature of my sud
invention, and in what manner the same is to be performed, I declare that what I
cluun is
In Duplex Pumping Engines and Motors
-
1 The employ in nt of sepirate reciprociting rotary valve for each motor
cylinder, such valves governing suitable supply and exhaust ports and being actu ited
directly by the movements of the pistons in the motor cylinders, the piston of one
cylinder controlling the supply and exhaust of steam or other fluid to the other
cylinder and uce versa, substantially as specified
2 The employment of an arm mounted on each piston rod and either directly or
by means of rollers engaging a slot of cam form or formed with inclines, provided in
sleeve secured to the spindle of the valve controlling the supply and exhaust of the
other cynder, substantially as specified

page_text: 3 The employment of an arm mounted on each piston rod, the outer end of each
arm sliding along rod provided with suitable stops or ibutments and which is con-
nected to another arm mounted on the spindle of the valve controlling the supply
and exhaust of the other cylinder, substantially as specified
4 The employment of an arm mounted on each piston rod, the outer end of each
arm being secured to a rod provided with means for acting upon tappets mounted on
the spindle of the valve controlling the supply and exhaust of the other cylinder,
substantially as specified
5 The means for crossing the motion imparted to the valve spindle on one side so
s to cause it to actuate the valve on the other side, substantially as described and
shown in Figs 12, 15 and 16 of the drawings