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Sept. 24, 1946.
J. K. SIMPSON
2,408,003
LIQUID PRESSURE REMOTE CONTROL SYSTEM
'Filed Jan. 3, 1944
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Sept. 24, `1946.
~
J. K. _SIMPSON
LIQUID PRESSURE REMOTE CONTROL SYSTEM
Filed Jan. 5, 1944 ì
4 Sheets-Sheet 2
Sept. 24, 1946.
J. K. SIMPSON
'
2,403,003
LIQUID PRESSURE REMOTE CONTROL SYSTEM
`
Filed Jan. 3, 1944
4 Sheets-Sheet 5
'
Patented Sept. 24, 1946
2,408,003
YUNITED STATES PATENT OFFICE
2,408,003
LIQUID# PRESSURE REMOTE CONTROL t
SYSTEM
John Keith Simpson, Leamington Spa, England,
assignor to Automotive Products Company Lim
ited, Leamington Spa, England
Application January 3, 1944, Serial No. 516,863
In Great Britain November 12, 1942
16 Claims.
(Cl. 60-54.5)
l
2
This invention relates to liquid pressure re
mote control systems, and more specifically to
that type of remote control system in which a
transmitter piston is movable in a cylinder to
Y
end of the transmitter cylinder to a drain or
reservoir, whereby the liquid from said source
eject liquid from the cylinder through a pipeline
tends to move the motor piston in the same direc
tion as it has been moved by liquid from the
transmitter cylinder during the stroke of the
into a motor cylinder and so to produce corre
latter just completed.
sponding movement of a piston in the motor
cylinder.
Y
In a liquid pressure remote control system ac
cording to the lastpreceding paragraph, the ef
The primary object of the invention is to pro
fective area of each end of the transmitter piston
vide an improved means for periodically correct
10 may be equal to the effective area of that end
ting the phase relation of the transmitter and
motor pistons, in order to compensate for eX
pansion and contraction of the liquid due to tem
of the motor piston upon which liquid ejected
from the transmitter cylinder by that end of the
transmitter piston acts, the total stroke of the
transmitter piston being greater than the stroke
perature variations, and for leakage from the sys
tem. Another object is to provide transmitter 15 of the motor piston, and that part of the stroke
and motor units each constitutingelements of
two separate remote control systems, operable
of vthe transmitter piston during which neither
end of the transmitter cylinder is connected to
together or separately to produce different move
the source of liquid under pressure being equal ‘
ments of a controlled element'.
to the stroke of the motor piston.
In a liquid pressure remote control system of
According to one aspect of the invention, in a 20
liquid pressure remote control system of the type
the type referred to having the motor piston
movable in one direction by liquid pressure and
referred to, the movement ci the transmitter pis
ton to at least one end of the transmitter cylinder
in the other direction by a spring, valve means
may be'provided to connect the liquid-containing
opens a .valve connecting that end of the trans
mitter cylinder to a source _of liquid under pres 25 part of the system to a source of liquid under
pressure When the transmitter piston is at the
sure, whereby the stroke of the motor piston,
end of the stroke during which it transfers liquid
if, due to leakage o1' other causes it has not been
to the motor cylinder, and to connect the said
completed by the movement of the transmitter
piston, is completed by liquid from the said
part of the systemto a reservoir or drain when
source.
‘
the transmitter piston is at the other end of
According to another aspect of the invention,
a liquid pressure remote control system of the
type referred to, comprises a transmitter cylinder,
a motor cylinder, pistons in the said cylinders,
means for producing movement of the transmit
ter piston in the transmitter cylinder, and a Valve
device operated by the movement-producing
means when the transmitter piston reaches at
least one end of its stroke, to connect the motor
cylinder to a source of liquid under pressure in
such a way that the pressure from the said source
tends to move the motor piston in the same direc
its stroke.
'
According to a further aspect of the invention,
in a liquid pressure remote control system of the
type referred to, a piston reciprocable in a trans
mitter cylinder is hollow and itself forms a cylin
der for a second piston reciprocable therein, the
transmitter unit being connected by conduits to
motorV cylinders the pistons in which are operated
by the inner and outer pistons of the transmitter
unit respectively, and means being provided to
move the transmitter pistons together or sepa
rately, to produce movement of one or other of
the motor pistons relative to the cylinder inY
which it is mounted.
45
In a liquid pressure remote control system as
latter just completed.
set out in the last preceding paragraph, the motor
A double acting liquid pressure remote control
cylinders may comprise a single unit similar to
system of the type referred to may comprise a
the transmitter, one piston being hollow to form "
transmitter cylinder, a motor cylinder, pistons
the cylinder for the second piston.
in the cylinders, and two pipe-lines each con
A liquid pressure remote control system as set `
necting one end of the transmitter cylinder to 50
out in the two last preceding paragraphs may
one end of the motor cylinder, the movement of .
be combined with a pair of devices each mounted
the transmitter piston to either end of the trans
for reciprocatory or oscillatory movement in one
mitter cylinder actuating a valve to connect that
plane upon an intermediate support itself mount
end of the transmitter cylinder to a source of
ed for reciprocatory or oscillatory movement in
liquid under pressure and to connect the other
tion as it has been moved by the liquid from the
transmitter cylinder during «the stroke of the
2,408,0os'
3
4
a plane perpendicularV to the iirst, the hollow
piston rods of Vthe liquid pressure control system
being connected to the intermediate supports, and
the inner piston` rods of the liquid pressure con
trol system being connected to the devices them
by and moving with the transmitter piston rod
selves through bell-crank levers pivotally mount
ed at their elbows on the intermediate supports.
The invention is hereinafter described with rcf- ,
I3. Within the bore 28 the rod 48 is surrounded
by a spring 52 extending between two washers
53, 53, the rod having abutments 5e, 55 to be en
gaged by‘the washers and to limit the extension
y ofthe spring.
A reduced portion of the bore 28
terminates in a shoulder 5t spaced from the end
5l of the sleeve 2t by a distance equal to the
spacing of the abutments 54, 55, and the washers
erence to the accompanying drawings, in which:
Figure 1 shows in diagrammatic form
two-> 10 itâ-»project radially beyond the abutments 515, 55
to engage the shoulder 55 and the end 5l >of the
pipe-line liquid pressure remote control system
sleeve respectively. The valve piston 23 isy thus
according to the invention;
`
,
v ,
ì
,
biased to a central position by the spring, but
Figure 2 shows, also in diagrammatic
a
can be moved in either direction from that posi
single-pipe-line liquid pressure remote control
tion. The arrangement is such that with the
system according to the invention;
Figure 3 shows the transmitter' and receiver ‘valve piston 29 in the position to which it is
moved bythe spring, the ports Si and 33 are
units of a modified form of liquid pressure remote
covered by the lands 4I and G2 on the valve pis
control system according to the invention;
ton, movement of the piston in either direction
Figure 4 is an isometricview showing the trans
bringing one or `other of the ports 3l and 33 into
mitter unit of the system shown in Figure 3 cou
communication with the recess ¿i3 in the piston,
pled to one of two devices which are to be op
so that that portV is connected to the port 32 and
erated in synchronism; and
to the accumulator 33, and simultaneously bring
Figure 5 is a diagram relating to one method
ing the other port Sí or 33 into communication
of employing the system shown in Figure 3.
Referring to Figure 1, the transmitter and mo 25 witheitherv the recess $4 or the bore of the sleeve
3Q beyond the end 41 of the valve piston, so that
tor units are shown at A and B_respectively. The
that port is connected 'to the port 34 and so to the
transmitter comprises a body ifi having a cylin
reservoir 4i).
' `
der bore I l therein to receive a piston l2, the pis
The arrangement is' such that as 'the' trans
ton rod I3 of which projects from the body is
and carries a member I4 for connection to an
' mitter piston i2 approaches either end of'its
operating lever or equivalent (not shown).
stroke, the arm 5I engages the 'stop 'it ror Eil and
VThe motor unit comprises a cylinder i5 in
which there is slidable a piston Ai5 having a rod
Il of the same diameter as the transmitter piston
rod, to which is attached a member i8 for oon
nection to the device to be operated.
The cylinder boreV I I in the transmitter unit,
and the bore of the motor cylinder i5 are of the
same diameter, 'and each is divided by its piston
into two chambers, one ‘of the full’bore of the
cylinder’and the other of'an effective area equal
to the cylinder bore less the' area of the piston
rod., The two chambers in the transmitter cylin-l
derjare‘ indicated Aby the references i8 and i9 re~
spectivel‘y, i8 being the annular chamber, and the
two chambers inthe motor cylinder are indicated
by the references 25 and 2i respectively, 2e being
the annular chamber. Ports 22 and 23 leading to
moves the lvalve piston from its> central posi» '
the Vchambers i8 and 2e respectively are con
nected by a pipe 24, and ports 25 and 23 leading
to the chambers i9 and 2l respectively’are con-Í
nected by a pipe 2l.
' The transmitter body lil also contains a bore
28 to accommodate a piston valve 29. The bore
28 is parallel to thecylinder bore il, and has
fixed therein at one end a sleeveväz'i in which are
four longitudinally spaced >ports 3i, .'32, 33 and
34. The port 3i is connected by a passage 35 in
the body I9 to the annular chamber i8 in the
cylinder I I, and the port 33 is similarly connected
tion to make the appropriate connections be»
, tween the transmitter cylinder Ii and the ac»
cumulator S8 and reservoir 4i), as described below.
The total stroke of the transmitter piston’ l2 is
greater .than the total stroke of the receiver pis~
ton-iii', the stroke of the latter piston being equal
to the part of the stroke of the transmitter piston
between'the
commence topoints
be opened
at which
bymovement`
the ports of3i the
andpis
tonvalve
1 The accumulator
25. - ' 33 is suppiied
M with
"
liquid un
der pressure by a continuously driven pump 5i!
which draws liquid fromY the reservoir’llû, a cut
out valve 59 being provided to connect thepump
to the accumulator when the vpressure in the iat
ter falls below a' predetermined' minimum, and to
disconnect the pumpffrom the accumulator and
allow it to circulate liquid idly back to the reser
voir when the pressure in the accumulator rises
to a predetermined maximum.
_
»l
Y J
VThe system above described is shown in Figure
1 withboth pistons at one end of their strokes,
so that the-chambers I8 and 2| in the transmitter
and receiver units respectively have vtheir maai
mum volume, and the chambers lâ and 2B their
minimunivoiume. >The-arm 5i is in engagement
with the stop 5t, and the piston »valve is so po
sitioned that the port 33 is connected to the port
32, and to the accumulator, whilst the port tl is
by a passage 36 to the chamber I9. The inter
mediate port 32 is connected by a pipe Si to a
connected to the port 3ft', and to the reservoir.~ v
liquid pressure »accumulator 38, and the fourth.
This is the condition which exists when the trans
port 34 is connected by a pipe 39 to a liquid reser
mitter 4piston I2 has completed its stroke towards
voir liti. The ports 3| and 33 are equidistant from 65 the right as shown on the drawings, and it will be
the port 32. The piston valve 29 has two lands
evident that should there have been any leakage
el and ‘l2 oi equal length separated by an annu
or contraction of the liquid in that part of the
lar» recess t3, the- land M being bounded on its
system comprising the chambers I9 and 2IV and
opposite side by a second annular recess M con
the pipe 2l which would result in the piston I6
nected by passages 45 and'liö to the end face 4l 70 lagging behind the piston i2, the stroke of the of the valve piston. From the end of the valve
piston it would `be completed by »pressure from
piston nearer'the'recess V¿i4 there extends a rod
¿i8 which projects from Athe body I0 andV carries
two stops 49 and 59, between which `the rod
the 'ì accumulator after the piston valve 2t has
moved to connect the ports 32 and 33, whilst any
excess liquid in the part of the system comprising
passes freely through a hole in an arm 5I carried 75 the chambers I8 and 2B and the pipe 24 would
2,408,001?
È
.
6
be‘éj‘e‘cted through the passage 35, and ports 3|
the stroke of the motor piston 62 is shorter than
and 34, to the reservoir. Movement of the trans
mitter piston to the opposite end of its stroke
moves the valve piston 29 to connect the port
3| to the port 32, and the port 33 to the port 35,
thus permitting liquid from the accumulator to
the total stroke of the transmitter piston 9|, the
enter the part of the system comprising chambers
i8 and 23 and pipe 2li, and connecting the part
of the system comprising chambers i3 and 2|
and pipe 21 to the reservoir, and so ensuring that
the stroke of the motor piston in that direction
is completed. So long as the transmitter piston
moves in that part of its travel between the points
where the valve 29 begins to open the ports 3l
and 33, the system is completely closed.
The system shown in Figure 2 is‘of the single
pipe-line type, the pistons 5| and B2 of the trans
area of the pistons being equal, and the stroke
of the motor piston is equal to the stroke of the‘
transmitter piston between the points at which
the valve commences to open the port 13.
Figure 3 shows what may be termed a dual
remote control system, in which the transmitter
unit and motor unit each include the elements of
two separate systems. The transmitter unit is
indicated :by the reference E and the motor unit
by the reference F. The transmitter unit com
prises a body 3| in which is mounted a sleeve 92
forming the cylinder ~for a hollow piston 93 which
15 itself forms the cylinder for a second piston 94
hereinafter referred to as the inner piston. ‘ From
one end of the hollow piston 93 there extends a
tubular piston rod 95, through which passes the
rod 96 of the inner piston 94, the rod 96 being of
single pipe 35, and being held up against the 20 sumcient length to project beyond the outer end
of the hollow rod 35 whatever may be the position
liquid column in that pipe and the cylindersby
springs 65 and 31. The piston rods are provided
of the inner piston 34 in the hollow piston 93.
with coupling members E3 and 39 respectively
The motor unit comprises a cylinder 91 in
for connection to an operating lever or equiva
which is slidably mounted a hollow piston 38
lent, and to the device to be operated. The body
itself forming a `cylinder for an inner piston 99.
As in the transmitter unit, the hollow piston 9B
bore
13 of1ithe
fortransmitter
a piston valve
unit
12 Ccontrolling
is formedthe
with
con
mitter unit C and motor unit D respectively op
erating in cylinders E?, and 3i! connected by a
nection between a single port 13 connected by a
passage 'a'liwith the transmitter cylinder and
either of two ports 15 and 16, the port 15 being
connected by a pipe 11 to a liquid pressure ac
has a tubular piston rod |99 through which ex
tends the piston rod `||'i| of the inner piston 99.
Two piston valves |02 and |33 are arranged in
rbores |34 and |05 in the body 9|, each valve being
identical with the valve 29 shown in Figure l, and
cumulator 18 and the port 15 being connected
having a similar centering spring |55. ‘ The pis
by a pipe 19 to a liquid reservoir 83, A land 3|
on the valve piston 12 separates an annular re
cess 82 in the valve piston from the end of the
ton valve £32 controls the connections between
piston, the ports i5 and 13 being respectively in
permanent communication with the recess 82 and
the valve bore 1| beyond the end of the piston.
ports |31, |53, |39 and H0, the ports |01 :and |39
being lconnected by passages ||| and H2 to lon
gitudinal grooves ||3 and H4 in the outer sur
face of the sleeve 32, the grooves being connected
by ports H5 and ||6 at the centre of the length
of the sleeve to further longitudinal grooves ||1
and | |3 in the outer surface of the hollow piston,
from which grooves ports IIB and |20 lead re
spectively into opposite ends of the hollow piston.
The piston valve |53 controls the `connections be
The port 13 lies midway between the ports 13
and 13, being covered by the land 3| when the
valve piston is in a central position. The valve
piston is biassed to a central position by a spring
S3 similar to the spring 52 of Figure l, and is
similarly displaced when the transmitter piston
tween ports |2|, |22, |23 and |24, the ports |2|
reaches either end of its stroke, by the engage 45 and |23 being connected by passages |25 and |26
ment of an arm 34 carried by the rod of the
to opposite ends of the main transmitter cylinder
transmitter piston with one of two stops |35 and
formed by the sleeve 92. A pipe |21 connected
to the ports |58 and |22 leads to a liquid pres
86 on the valve rod 81.
The pressure in the accumulator is maintained
sure accumulator (not shown), and a pipe |28
by a pump S8 and cut-out valve 39 as described 50 yconnected to the ports III] and |24 leads to a
in connection with Figure l.
liquid reservoir, also not shown, the liquid pres
In the system just described, when the trans
sure and accumulator being coupled up with a
mitter piston 3l is moved to the end of its stroke
pump and cut-out valve as shown in Figure 1.
during which it forces liquid into the motor` cyl
The connections between the transmitter and
inder, the valve piston ‘l2 is moved toa position 55 motor units are as follows, the left and right hand
in which it connects the ports 13 and 15, so that
ends of the various parts being as shown on the
liquid from the accumulator 13 can enter the
drawings. The left hand end of the transmitter
system, and complete the stroke of the _motor
cylinder (the sleeve 92) is connected to the left
piston 32 if, due to leakage or contraction of the
hand end of the motor cylinder 91 by the passage
liquid, this stroke has not been completed. The
|25, an annular groove |29 around the sleeve |30
parts are then in the position shown in Figure 2. 60 of the piston valve |03, and a pipe |3|. The right
During the movement of the transmitter piston
hand end of the transmitter cylinder is connected
away from the position shown, the spring 31
to the right hand end of the motor cylinder 91
causes the motor piston to follow up the move
by the passage |26, a branch passage |32 and a
ment of the transmitter piston. If there were 65 pipe |33. The left hand end of the hollow trans
an excess of liquid in the system, the motor pis
mitter piston 93 is connected to the left hand end
ton 32 would not be able to complete this stroke,
but the ñnal movement of the transmitter piston
6| in this direction moves the valve piston 12 to
connect the port 'i3 to the port 1G, thus connect
ing the system to the reservoir 83, so that the
spring E1 can force liquid out of the system to
the reservoir, and complete the stroke of the
of the hollow motor piston 38 >by way oi the port
piston 32.
that piston. The right hand end of the hollow
transmitter lpiston is connected to the right hand
- As in the ’case of the systemshown in Figure 1,
H9, groove H1, port H5, groove |I3, passage |||,
an annular groove |34 around the sleeve |35 of
the piston valve |32, a pipe |33, a port |311 in the
wall of the motor :cylinder 91, a longitudinal
groove |38 in the outer surface of the hollow
motor ‘piston 33, and a port |39 in the wall of
î'
Sl
end. of: theY hollow motor piston by the port |279,
jectingrfrom the pillar |58. The inner piston rod
groove H8, port Ilo, groove H4, passage H2, a
branchpassage |493, a pipe I 4|, a port |42 in the
wall of the motor cylinder 91, a longitudinal
groove |43 in the outer surface of the hollow
motor piston SS, and a port |44 in the wall of that
piston. The valve |03> is operated by» an arm |65
carried by the tubular piston rod e5 and aper
tured to slide between stops |58; andI |5| on the
rod |52 which carries the valve |03 so that the
valve piston les is-- moved to connect one or other
end of the transmitter cylinder (the sleeve 92)
to the liquid pressure accumulator and the other
end thereof to the reservoir, whenever the hol
low piston'cf‘i reaches either end of its stroke.
The valve ||l2 is operated by. a bent arm M9 car
ried by the piston rod 95 and apertured to slide '
between stops Itâ and |41 on the Valve rod |48
which carries the valve |02, the stops being so
spaced that the valve is operated only when both
the hollow piston 93 and the inner piston 94 are
at the sameiend of their strokes. Rotation of
the hollow pistons 93 and 98 is prevented, in order
to keep the grooves in the said pistons in register
with the ports in the transmitter and receiver i
95 is similarly connected by a vertical pivot to
links |63 connecting it to a member |64 con
nected by a horizontal pivot to one arm of a bell
crank lever |65y mounted on the bracket |51.
Theother arm of> the bell crank lever |65 is
coupled by a universally jointed link |65 to an
arm |51 secured to the searchlight |55.
Move
ment of the searchlight about its vertical axis
produces movement of both' the hollow piston rod
Q5 and the» inner piston rod 95, so that no rela
tive movement of the two pistons takes place.
Liquid is thus displaced by the hollow piston 93
QFigure 3) into the motor unit, but no liquid
is displaced by the piston 94, and the Ysecond
searchlight, which is connected t0 the motor
unit by linkage similar to that just described, _
moves also about its vertical pivot. On the other
hand, if the searchlight |55 is moved about the
horizontal pivot |56 the inner piston rod 96 is
displaced, with relation to the hollow piston rod
e5, and the inner piston 543 (Figure 3) of the
transmitter unit displaces liquid to the interior
of the hollow piston 98 of the motor unit, moving
the piston e9 therein and producing correspond
ing movement of the second searchlight about
cylinders, rotation of the hollow transmitter pis
ton being prevented by the Valve operating arm
its horizontal axis.
Y
.
|45, and rotation of the hollow receiver piston 88
The liquid pressure remote control system de
being prevented by an arm |53 having an aper
scribed with reference to Figure 3, coupled to
ture through which passes a »rod` |54 fixed to the 30 searchlights in the manner described with ref
cylinder 91.
erence to Figure 4, may with advantage be used
Each individual system of the dual system
shown in Figure 3 operates in exactly the same
manner as the system shown in Figure 1, except
that the system comprising the inner pistons 95|,
S9 and the cylinders formed within the hollow
pistons 93 and 98 (which may be termed the inner
system) is connected to the accumulator and
reservoir only when the hollow transmitter piston
Q3 as well as the inner piston 94 is at the end of
its stroke, both pistons being at the same end of
their strokes. It will be evident that this modi
fication must be made to avoid connection of the
inner system with the accumulator and reservoir
when the piston 94 is not at the end of its stroke.
In the drawings, the hollow piston 93 is shown
at the right-hand end of its stroke, the valve H33
having consequently been moved to connect the
ports E22, §23 together, and to connect the ports
I2! and |24 together, so that pressure from the
accumulator acts upon the hollow motor piston
Q3 to ensure that the stroke of that piston is com
pleted. rThe inner transmitter piston 95 and the
inner motor piston 9,9 are between the ends of
their strokes, and the valve |ll2 is, therefore, in its
central position and the ports |01 and le!) are
to ensure the operation in unison of two _search
lights which are _required to scan a substantially
rectangular area continuously. 1 The searchlight
l to which the transmitter unit of the control sys
tem is coupled is driven in such a way th'at~ its
beam 'B displaced along a path of the form indi
cated by the line Ile in Figure 5, the beam trav
elling to and fro on paths Ill displaced laterally
one from another, and returning from the end of .
an extreme lateral path to the corresponding end f
of the other extreme lateral path. Each lateral
path lli corresponds to a complete stroke of
the hollow pistons S3 and Q8, and each short
connecting path' llt corresponds t0 a partial
stroke of the inner pistons Sli and 951, whilst
the long connecting path |73 between the ex
treme lateral paths |'I| corresponds to a com
plete stroke of the inner pistons 94 and 9,9. Dur
ing a complete cycle of movement of the search
lights, the system comprising the'main cylinders
and the hollow pistons 93 and 93 is connected lfat
each end to the accumulator as many times as
there are lateral paths íïl, and the inner system
comprising the hollow pistons and inner pistons
is connected at each end to the accumulator once
only, at the points VM and Iï5. Owing to the
VFigure 4 shows a transmitter unit of the kind
fact that the stroke of the transmitter pistons
shown in Figure 3 Ycoupled to a searchlight, to
is slightly longer than that of the motor pistons,
enable the movements of that searchlight to be
lthe connecting paths W2 of the searchlight con
60
duplicated by a second searchlight. No driving
nected to the motor unit will be slightly displaced
mechanism for .eñecting movement of the
inwardly from the corresponding paths of the
searchlight has been shown, as this may be of
searchlight connected to the transmitter unit,
any known or convenient type and forms no part
but within the area represented by the chain
of the present invention.
65
dotted rectangle I`I6 the two searchlights will
The searchlight §55 is mounted .on a horizon
move in synchronism.
Y
l
tal pivot |56 in a U-shaped bracket |57 itself
The transmitter unit shown in Figure 3 might
mounted on a vertical pillar |58 pivotally mount
be used with two separate motor units each cor
ed in a base |59. The body 5| of the transmit
ter unit is rigidly secured to the base |59 by any 70 responding to one part of the combined motor
unit shown in the drawings. Although' the source
convenient means. The hollow piston rod 95
of pressure liquid has been described in all cases
carries, on the boss of the arm |135, horizontal f
pivot pins for a pair of links .Ißû pivotally con
as an accumulator in which pressure is main
nected at their other ends to a fork ISI itself
tained by a pump, it may be a constant-pressure
pivotecl, on a vertical axis, to an arm |62 pro 7.5 variable delivery pump, the delivery of which
‘i closed.
2,408,003
10
falls to zero when no liquid is being fed to the
system.
The dual type of remote control system de
scribed may be applied to purposes other than
that described herein. For example, it might be
vused to connect a weapon such as a machine
gun or automatic cannon to a, remote sighting
device, the sighting device being moved by hand
with or without servo-assistance, as desired over
the iield of nre which it covers, and the dual re
mote control system causing the gun to follow
the sighting device. Pte-phasing of both systems
would then take place at the will of the operator,
who, for that purpose, would move the sighting
device to a position in which both transmitter
pistons were at the same end of their stroke.
What I claim is:
1. A liquid pressure remote control system of
the type describedcomprising a transmitter unit
including a cylinder having a piston therein, a -
source 0i liquid under pressure, a motor unit in
cluding a cylinder having la piston therein, means
connecting the transmitter unit to the motor unit,
4. A double acting liquid pressure remote con
trol system of the type described comprising a
transmitter cylinder, a motor cylinder, pistons in
the cylinders, two pipe-lines, one line connecting
one end of the transmitter cylinder to one end
oi the motor cylinder and the other line con
necting the other end of the transmitter cylinder
to the other end of the motor cylinder, a reser
voir having a connection to the transmitter cyl
inder, Ía source of liquid under pressure having a
connection to the transmitter cylinder, liquid in
the two pipe lines and in the ends of the cyl
inders, and valve means to be actuated by move
ment of the transmitter piston to `either end of
the transmitter cylinder, to connect that end of
the transmitter cylinder to which the piston is
moved to the liquid pressure source and to con
nect the other end to the reservoir, whereby the
liquid from the source tend-s to move the motor
piston in the same direction as it has been moved
by the liquid from the transmitter cylinder dur
ing the stroke of the transmitter piston just co-m
pleted, the effective area of each end of the trans
mitter piston is equal to the effective area of
that end of the motor piston upon which liquid
said connecting means and the transmitter and
motor units forming a normally closed hydraulic
system, manual means for operating said -trans
ejected from .the transmitter cylinder by that end
mitter to put said closed hydraulic system under
of the transmitter piston acts, the total stroke
pressure, `and a valve for controlling the liquid
of the transmitter piston being greater than the
source to said transmitter »and motor units, said
stroke of -the motor piston, the stroke of the motor
valve being responsive to the movement of the 30 piston being equal to that part of the stroke of
transmitter piston to at least one end of the trans
the transmitter piston during which neither end
mitter cylinder to cause said valve to open to
of the transmitter cylinder is connected to the
connect that end of the transmitter cylinder to
source of liquid under pressure.
`
said pressure source, whereby the stroke of the
5. A double acting liquid pressure remote con
motor piston if not completed by the movement
trol system of the type described comprising a
of the transmitter piston is completed by liquid
pressure from said source.
transmitter cylinder, a motor cylinder, pistons in
the cylinders, two pipe-lines, one line connecting
v2. A liquid pressure remote control system of
the type described comprising a transmitter cyl
inder, a motor cylinder, pistons in said cylinders,
two conduits, one conduit connecting one end of
the motor cylinder and the other line connecting
the other end of -the transmitter cylinder to the
other end oi the motor cylinder, a reservoir hav
the transmitter cylinder to one end of the motor `
one end of -the transmitter cylinder to one end of
ing a connection to the transmitter cylinder, a
cylinder and the other conduit connecting the
source of liquid under pressure having a connec
other end of the transmitter cylinder to the other
tion to the transmitter cylinder, liquid in the two
end of the motor cylinder and which together 45 pipe lines and in the ends of the cylinders, and
form a closed hydraulic system, means for pro
valve means to be actuated by movement of the
ducing movement of the transmitter piston in
transmitter piston to either end of the transmitter
the transmitter cylinder, a source of liquid under
cylinder, to connect that end of the transmitter
pressure, and a valve device operated by the
cylinder to which the piston is moved to the liquid
50
movement producing means when the transmitter
pressure source and to connect the other end to
piston reaches at least one end of its stroke, to
the reservoir, whereby the liquid from the source
connect the motor cylinder to said source of
tends to move the motor piston in the same direc
liquid pressure to cause the motor piston to tend
tion as it has been moved by the liquid from the
to move in the same direction as it has been
transmitter cylinder during the stroke of the
moved by the liquid from the transmitter cyl 55 transmitter piston just completed, said. Vvalve
inder during the stroke of the transmitter piston
means controlling the connection ofboth ends of
just completed.
the transmitter cylinder to the source of liquid
3. A double acting liquid pressure remote con
under pressure, and to the reservoir.
trol system of the type described comprising a
6. A double acting liquid pressure remote con
transmitter cylinder, a motor cylinder, pistons 60 trol system of the type described comprising a
in the cylinders, two pipe-lines, one line connect
transmitter cylinder, a motor cylinder, pistons
ing one end of the transmitter cylinder to one
in the cylinders, two pipe-lines, one line connect
end of the motor cylinder and the other line
ing one end oi the transmitter cylinder t0 one end
connecting the other end of the transmitter cyl
of the motor cylinder and the other line con
inder to the other end of the motor cylinder, a 65 necting the other end of the transmitter cylinder
reservoir, a source of liquid under pressure, and
to the other end ci the motor cylinder, a reser
a valve to be actuated by movement of the trans
voir having a connection to the transmitter cyl
mitter piston to either end of the transmitter
inder, a source of liquid under pressure having a,
cylinder, to connect that end of the transmitter
connection to the transmitter cylinder, liquid in
cylinder to which the piston is moved to the
the two pipe lines and in the ends ci the cylinders,
liquid pressure source and to connect the other
valve means to be actuated by movement of the
end to the reservoir, whereby the liquid from
transmitter piston to either end of the trans
the source tends to move the motor piston in the
mitter cylinder, to connect that end of the trans
same direction as it has been moved by the trans
mitter cylinder to which the piston is moved to
mitter piston during its stroke ‘just comple-ted.
the liquid pressure source and to connect the
2,408,003
1‘2
other end to the reservoir, whereby the’liquid
to the reservoir kwhen the transmitter piston is at
from the Asource tends to move the motor piston
in the same direction as it has been moved by
the other end of its stroke, said valve means
isolating the source of fluid under pressure and
the reservoir from the normally closed hydraulic
system at all other times.
9. A liquid pressure remote control system ac
the liquid from the transmitter cylinder during
the stroke of the transmit-ter piston just com
pleted, said valve means controlling the connec
tion of both ends of the transmitter cylinder to
cording to claim 8, wherein the valve means com
prise a single piston valve, three ports axially
spaced with respect to the piston valve which
the source of liquid under pressure, and to the
reservoir, the valve being normally biased to an
intermediate position in which `both ends of the
transmitter cylinder are disconnected both from
the source and the reservoir, a pair of stops se
cured to the valve means, and an arm carried by
the transmitter piston for engaging said` stops to
>move the valve in either direction from its inter
mediate position to connect one or the other ends
of the transmitter cylinder to the vsource or the
reservoir.
,
‘7. A vdouble acting liquid pressure remo-te `con
tro-l system of the type described compri-sing a
transmitter cylinder, a motor cylinder, pist-ons in
the cylinders, two pipe-lines, one line connecting
one end of the transmitter cylinder to one end of
the motor cylinder, and the other line connect
ing the other end of the transmitter cylinder to
the other end of the motor cylinder, a reservoir
having a connection to the transmitter cylinder,
a source of liquid under pressure having a con
nection to the transmitter cylinder, liquid in the
two pipe lines and in the ends of the cylinders,
controls said ports, the two outer ports arel con
nected respectively to the source of liquid under
pressure and the reservoir, the intermediate port
is connected to the liquid containing sides of the
cylinders, said valve being normally biased to a
central position in which it obturates the inter
mediate port, and being movable in Veither direc
tion to connect the intermediate port to one or
the other of the outer ports.
10. A ‘liquid pressure remote oon-trol system of
the type described comprising a transmitter unit
including a cylinder, motor cylinders, an -outer -or
hollow piston forming a second transmitter cyl
inder which is reciprocable in the first-named
transmitter cylinder, an inner or second piston
reciprocable in the second Ytransmitter cylinder
or hollow piston, pistons in the motor cylinders,
conduits connecting the transmitter unit to the
motor cylinders, the pistons in the motor cylinders`
being operated by the hollow piston and the sec
30 ond piston vof the transmitter unit respectively,
a single piston valve' including» an operating rod
and means being provided to move the trans
to be actuated by movement oi the transmitter
piston to either end of the transmitter cylinder,
to connect that end of the transmitter cylinder
movement of oneor the other of the motor pistons.
mitter piston-s together or separately to produceL
to which the piston is moved to the liquid pres‘- _,
sure source and to connect the other end to the
11. A liquid pressure remote control system
according to claim 10, wherein ,one of the motor
pistons is hollow to form a >cylinder for the yother
reservoir, whereby the liquid from the source
motor piston.
tends to move the motor piston in the same direc
tion'as it has been moved by the liquid from the
transmitter cylinder during the stroke of the
transmitter piston just completed, said valve con
trolling the connection of both ends of the trans
mitter cylinder to the source, and to the reser
voir, a spring normally biasing said valve to an
intermediate position in which both ends of the ‘
, transmitter cylinder are disconnected both from
the source and the reservoir, a pair of stops on
the operating rod, an arm carried by the trans
mitter piston for engaging said stops .to move the
valve in either direction from its intermediate
position, a second pair of stops on the operating
rod, a third pair of stops radially displaced with
respect ‘to said second stops and having the same
spacing axially between them as the second
stops, and a pair `of washers slidable on the oper
l2. A liquid pressure remote control system of
the type described comprising a transmitter uni-t
including a cylinder, motor cylinders, an kouter
or lhollow piston forming a second transmitter
cylinder which is reciprccable in the iirst-named
transmitter cylinder, an inner or second `piston
reciprocable in the second transmitter cylinder
or hollow piston, pistons in the motor cylinders,
conduits connecting the transmitter unit to the
motor cylinders, the pistons in the motor cylin
ders being operated by the hollow piston and the
second piston of the transmitter unit respectively,
and means being provided to move the trans
mitter pistons together or separately to produce
movement oi" one or the other of the motor pis
tons, said motor pistons comprising an outer or
hollow piston forming one of said motor cylinders
and an inner or second piston reciprocable in
said outer piston, a source of fluid under pressure,
ating rod, said washers being engageable both
a reservoir, and a valve for each of the transmit
with the second and third stops, said spring hav
ter cylinders, one or `the other of said valves to ‘
ing its ends abutting the Washers tending to urge
he actuated by movement of either of the trans
the same against the second and third stops.
8. A liquid pressure remote control system of 60 mitter pistons to either end of the cylinder in
Which it operates to connect that end of the said
the type described comprising a transmitter cyl
cylinder tothe source of liquid `under pressure,
inder, a motor cylinder, pistons in said cylinders,
and to connect the other end of `the said cylinder
a conduit connecting one end of the transmitter
to the reservoir, whereby liquid from the pres
cylinder to one end of the motor cylinder to form
sure source tends 'to move the corresponding
a normally closed hydraulic system through
motor piston in the same ’directionV as it has been
which force is transmitted to the piston in the
moved by liquid from the transmitter cylinder
motor cylinder for moving the motor piston in
during the stroke of the transmitter piston just
one direction, a spring for moving the motor
completed.
piston in the oppositeV direction, a source of fluid
13. A liquid pressure remote `control system
under pressure, and a reservoir,y valve means 70
according to claim 12, wherein the valve con
for connecting the liquid containing end of the
trolling the connection of the transmitter -cylin
cylinders to the source when the transmit
der, formed by the interior of the hollow piston,
-ter Ypiston is at the end of its stroke 'during
Which'it transfers liquid .to .the motor cylinder,
to the source »of pressure and to the reservoir is
and for 4connecting the said end of the cylinders 75 operated to `connect the ends of the said `cylinder
>2,408,003
13
to the source and reservoir respectively only when
both transmitter pistons are simultaneously at
the same end of their strokes.
14. A liquid pressure remote control system of
the type described comprising a transmitter unit
including a cylinder, motor cylinders, an outer
or hollow piston forming a second transmitter
cylinder which is reciprocable in the ñrst-named
transmitter cylinder, an inner or second piston
14
reciprocable in the second transmitter cylinder
or hollow piston, pistons in the motor cylinders,
conduits connecting the transmitter unit to the
motor cylinders, the pistons in the motor cylin
ders being operated by the hollow piston and the
second piston of the transmitter unit respec
tively, and means being provided to move the
transmitter pistons together or separately to pro
duce movement of one or the other of the motor
reciprocable in the second transmitter cylinder 10 pistons, and connections to the interior of the
or hollow piston, pistons in the motor cylinders,
hollow piston, said connections comprising longi
conduits connecting the transmitter unit to the
tudinal grooves in the exterior of the hollow
motor cylinders, the pistons in the motor cylin
piston and ports in the wall of the transmitter
ders being operated by the hollow piston and the
cylinder, and further ports in the piston connect
second piston of the transmitter unit respec 15 ing the grooves to opposite ends of the interior
tively, and means being provided to move the
of said piston.
transmitter pistons together or separately to pro
16. In combination a liquid pressure remote
duce movement of one or the other of the motor
control system of the type described comprising
pistons, said motor pistons comprising an outer
a transmitter unit'J including a cylinder,l motor
or hollow piston forming one of said motor cylin
cylinders, an outer or hollow piston forming a
ders and an inner or second piston reciprocable
second transmitter cylinder which is reciprocable
in said outer piston, a source of fluid under pres
in the iirst-named transmitter cylinder, an inner
sure, a reservoir, a Valve for each of the trans
or second piston reciprocable in the second trans
mitter cylinders, one or the other of said Valves
mitter cylinder or hollow piston, pistons in the
to be actuated by movement of either of the> 25 motor cylinders, conduits connecting the trans
transmitter pistons to either end of the cylinder
mitter unit to the motor cylinders, the pistons
in which it operates to connect that end of the
in the motor cylinders being operated by the
said cylinder to the source of liquid under pres
hollow piston and the second piston of the trans
sure, and to connect the other end of said cylin
mitter unit respectively, and means being pro
der to the reservoir, whereby liquid from the 30 vided to move the transmitter pistons together
pressure source tends to move the corresponding
or separately. to produce movement of one or the
motor piston in the saine direction as it has been
other of the motor pistons, said motor pistons
moved by liquid from the transmitter cylinder
comprising an outer or hollow piston forming
during the stroke of the transmitter piston `iust
one of the motor cylinders and an inner or second
completed, each valve having a rod with stops 35 piston reciprocable in said outer piston, hollow
thereon axially spaced, and an arm for each of
piston rods connected to the hollow pistons, inner
the transmitter pistons and carried by the re
piston rods connected to the inner pistons, bell
spective piston for engaging the stops of the
crank levers connected to the inner rods, a pair
appropriate valve when the piston approaches
of devices each mounted for oscillatory move
the end of its stroke, whereby said valve is oper 40 ment in a selected plane, and a pair of supports
ated.
on which the devices are mounted for oscillation,
15. A liquid pressure remote control system of
said supports being mounted for oscillation in a
the type described comprising a transmitter unit
plane perpendicular to the first plane, the hollow
including a cylinder, motor cylinders, an outer
piston rods being connected to the supports, and
or hollow piston forming a second transmitter 45 the inner piston rods being connected to the
cylinder which is reciprocable in the ñrst-named
devices through the bell-crank levers.
transmitter cylinder, an inner or second piston
JOHN KEITH SIMPSON.
Certificate of Correction
Patent No. 2,408,003.
September 24, 1946.
JOHN KEITH SIMPSON
It is hereby certified that errors appear in the printed speciíìeetion of the above
numbered patent requiring correction as follows: Column 4, line 32, after “piston”
insert the numeral 29; column 11, line 70, claim 8, for “and a reservoir, Valve” read
erl reservoir, and valve; and that the said Letters Patent should be read With these cor
I'Oeàzìtions therein that the same may conform> to the record of the cese in the Patent
ce.
Signed and sealed this 16th dey of December, A. D. 1947.
THOMAS F. MURPHY,
Assistant Uommz'ssz'oner of Patents.
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