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Патент USA US2412053

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Ecc. 3, 1946.
Filed June 19, 1944
f2 _
lî’enef Lucien
_ Patented Dec. 3, 1946 I
mimmo amîxiïïournoa nii-vica,
et Mecanlqnes S. I. A. M., Fribourg, Swltxer
land, a corporation of Switzerland
Application .time 19, 1944, serial No. 540.91m
in Great Braam Maren 24,1943
_2 claims. (ci. en_-51)
„ 2
This invention comprises improvements in or
relating to hydraulic remote control devices. It
is an object of the invention to provide means for
the remote control of hydraulic apparatus such
as jacks, for example in aircraft, which combines
the advantages of centralised supply and control
with rapid operation and freedom from risk of
breakdown on interruption of supply.
On aircraft, especially on large aircraft, or on
\ installations of hydraulic apparatus in other con
nections where the parts to be controlled are re
mote from the point of control and from the
from a pressure-source,lcomprises, in combina
tion, an accumulator located close to the appa
ratus (Jack or other device) t0 be operated, op..
erating valve-means and connections between the i
accumulator and said apparatus to enable the '
accumulator when charged to operate the jack
under control of said operating valve-means, hy- `
draulic remote-control actuating means for the'
operating valve-means, including connections to
the point of control, and a pressure-line from
the pressure-source to the accumulator for charg
ing the same.
large-diameter piping which extends from the
pressure-source to the apparatus in order that
In this way only the short connections between
the accumulator and jack require to be of large
size, the pressure-line and the connections to the
lpoint of control may be small and light. The
any place in the pipe-system is likely to throw
the whole installation out of order. Finally, lthe
ity of accumulators may be provided therefor
with separate operating valve-means for each de
_ pressure source, if promptitude and reliability of
operation are required it is necessary to provide
pressure-source, such as a pump,4 may be of small
the ?low of liquid may be prompt and free. Fur
capacity inasmuch as its function is to charge
thermore it is ordinarily necessary to have the
the accumulatcrs and not directly to operate the _
source of supply of high-pressure fluid located
close to the point of control. The result is that 20 jacks or the like.
Where, as is usual, the apparatus to be oper»
the pipe-work is heavy. Moreover its diameter
ated comprises several distinct devices, a plural
and length makes it vulnerable and damage at
pump ordinarily employed as the source of sup 25 vice all connected by hydraulic remote-control '
means` to the control point and the pressure
ply, must have an output fast enough to operate
source may be connected to the accumulators'by
_ the apparatus at the desired speed.
It has been proposed _to control hydraulic jacks ' a branched pressure-line which serves them in
on an aircraft from a central control station by 30
Preferably when the hydraulic devices include
control means having electrical transmission and
to have the hydraulic installation located in close
conjunction with theojacks. This reduces weight
and vulnerability but involves complication by
introduction of the electrical apparatus.
a jack a hydraulically-controlled locking-device v
. may be provided for one end- of the movement
i or both ends of the movement) of the jack and
the operating valve-means include. a connection
In order to ensure reliable extension of an un.. 35 to the locking device to unlock it when the valve
means are operated to apply pressure to the jack
der-carriage irrespective of damage to pipe-work
to move it. I In this way the apparatus in the case
it has also been proposed in prior United States
of» any failure in the pipe-work may be caused
patent specification No. 2,001,620 to provide for
by the locking device to remain in the position in
movement in the direction of extension being ef-fected by pressure supplied by an accumulator lo 40 which it has already been set and may alsoXnot
'be disturbed in the event of any failure in the A
cated close to the jack so that only retraction
needs to be effected by liquid supplied from the
supply pump.
It will be appreciated that the small capacity
pressure-source. Certain risks due to the possi
bility o_f damage to the intermediate piping were 45 required of the control connections permits the
thus obviated and the quantity of pipe-work was
use of very light pipes and this results not only
reduced, but still the flow of the fluid had to take
in a saving of weight, which is important in the
place in the full volume necessary for operation,
case of aircraft, but also in a reduction of the
through a length of piping extending the whole
risk of damage in combat, which is important
way between the pressure-source, the point oi 50 in the oase of military services. Furthermore
control and the Jack and the capacity of the
such piping is much more easily installed.
pump and size and weight of the piping necessary
'I'he following is a description, by way of ex
had to be designed accordingly.
of one installation in accordance with the
According tothe present invention a hydraulic
system wherein the apparatus to be operated is 55 invention:
The accompanying drawing is a diagrammatic
located at a distance from a point of control and
representation of the parts of the system andof
the interconnecting pipe-work.
'I'lie installation comprises a number of hy
draulic jacks on an aircraft (of which one only
is shown at II) connected respectively to the un
Jack and in the other direction allows the valve
to seat and connects the jack through the supply
compartment 22 and the interior of the valve
stem 23 to the drain pipe 33.
dercarriage framework for retracting the same,
to bomb doors, to landing flaps and the like (not
Beyond the exhaust cylinder 3|, and axially in
line therewith, isa larger actuating or- motor cyl
inder 35 containing a relay piston 36. This pis
shown in the drawing) as may be desired. Close
ly associated with each jack, or with a group -of
motor. ` 'I'he relay piston 36 has a stem 31 which
ton may be broadly designated a valve-actuating
jacks where several jacks are located close to 10 is capable of engaging the tappet 34 in the ex
gether, is a hydraulic accumulator I2 of sufficient
haust cylinder but is urged away therefrom by a
capacity to operate the jack or jacks at least
spring 38. Behind the relay piston the operating
cylinder is provided with a connection to a iine
once in each direction._ The accumulators are
bore control-pipe 39 (or 40 as the case may be)
connected through non-return valves | 3 by small
bore pipe-work I4, I5 with a central supply pump 15 and when pressure is applied- in the operating »
cylinder 35 by ñuid supplied through the control
I6 located in> a position where it can readily be
pipe 'the stem of the piston therein is urged
driven. by one of the engines of the aircraft. This
against its spring 38 into contact with the piston
Apump may be of small capacity and will be re
or tappet 34 in the exhaust cylinder 3| and'
quired to run’on load for a longer proportion of
the working period than is usual with hydraulic 20 thereby closes the piston against the lift-valve,
and if the movement is continued lifts the lift
. pumps on aircraft, which is beneficial from theA
valve from its seating. ,
point of view of the pump. The function of the
. The two control-pipes 39, 40' which openinto
pump is to charge the accumulators, which may
the two actuating cylinders 35 are connected to a
be done slowly. It will be observed that thepipe
control-box in two parts 4|, 42 located in a lcen-I
|15 is branched at I_4 to the accumulator I2 and
tral point of control on the aircraft where it can
other branches will be provided to the other ac
readily be controlled by the pilot or other per
cumulators. The accumulators“ are connected
sonnel. Each control-box comprises a, lever 43,
each by a short pipe I1 and 21 of large bore to an
which lever operates control lift-valves 44, 45.
operating valve (in two parts I8, I9) for each
I _ jack and the operating-valves by similar pipes 2li
and 2| to the- jacks. Thus when the operating
valves are, operated the Jack is operated rapidly,
irrespective of the supply capacity of the pump.
"I'he valves 44 admit hydraulic `fluid under pres- I
sure from a compartment 46 to compartment 41
of the box, and thence to one of the control->
pipes 39 when one lever .43 is moved in one direc
tion and the other controlèpipe 48 when the
other lever 43 is moved in the other direction.
`The levers 43 are linked by spindle 48 to move in
the operating-valve casing. Through the supply
unison and controlled by handle 49. The fluid
compartment 22 there passes the hollow stem 23
under pressure is supplied to the control-box
of a lift-valve 24 the exterior of which passes
from the aforesaid central pump I8 by pipe 50
through the walls oi’> the compartment with a
fluid-tight fit. Outside the compartment is an 40 and only a very small quantity of fluid is neces»
sary to operate the relay pistons and open the
admission chamber 25 which is spanned by a
lift-valves of each jack. (It will be understood
diaphragm 26 containing a seating for the head
the cylinders 35, 3|, I8 and I9 and associated
of the lift-valve and one of the supply connec
parts are> not to scale and in practice are much
tions 21 from the accumulator I2 enters the ad
smaller in proportion to the size of the other
mission chamber. The hollow stem 23 has a port
parts than is possible to show on the drawing.)
28 connecting the interior of the stem with the
'I'he valves 45 when opened connect the com
admission chamber 25 below the diaphragm 25 so
partments 41 to compartments 5| and the com
that if the valve 24 is lifted from its seating the
partments 5I are connected to a drain pipe 52.
pressure ñuid from the accumulator will enter
the stem through the port. Another port 29 in 50 The valve 45 in each box is opened by lever 43
when valve 44 is closed. 'I'he boxes 4I, 42 are
the stem connects the interior of the stem with
Each end of the jack cylinder || is connected
by the pipes 20, 2| to a supply compartment 22 in
the supply compartment 22 which is connected
reversed in relation to one another so that when
to the jack by pipe 2|. Thus when the lift-valve
24 `of either valve I8 or I9 is raised from its seat
ing, the end of the jack II which is connected to
the compartment will receive fluid under pres
sure fr_om the accumulator. The interior of valve
pipe 39 is under pressure pipe 45 is open to drain,
3| works a tappet 34 which can be moved so that
and vice versa.
A similar pair of control-boxes 4|, 42 and han
dle 4.9 is provided at the central station for each
jack in the system and thus by a. system of very
light pipe-work the connections of the Jacks to
Il' I9, of which only the exterior is shown, is similar
their respective accumulators can be controlled
to that of valve I8.
As above stated, the stem 23 of the lift-,valve 60 as desired and the jacks operated in either direc
passes right through the supply compartment 22
tion without necessitating the whole of the oper
and out through the wall thereof onthe opposite
ating fluid iiowing all the way to the Jacks from
the pump I6 during the period of operation.
side from the head ofthe valve. The end of the
stem is open and- carries a seating 30; Beyond
_Furthermore, some of the jacks, particularly
theunder-carriage Jacks, may be provided with
the compartment the end of the stem projects
hydraulically-operated bolts 53, 54 or their equiv
into an exhaust cylinder 3I which is connected`
by a port 32 to a drain pipe 33. In the .cylinder _
aient for locking them in one‘or other extreme of
These bolts are slidably mounted in
it engages the seating 38 around the end of the ` cylinders 55, 56 which contain bolt-withdrawing
stem 23 and thereby seals the interior ofthe valve 70 pistons and return springs. The cylinders which
stem from the drain, while further movement of ,
contain the bolt-withdrawing pistons are con
the piston or tappet would lift the valve 24 from
nected by short pipes 51, 58 to the actuating cyl
its seating. It will be appreciated therefore that
inders 35 which contain the relay pistons 35.
movement of the actuating tappet 34 in one di
The connections for this purpose extend to the
rection lifts ’the valve and applies pressure to the
centre of that end of the actuating cylinders to
which the control pipes 39, 40 are connected and
the ports äs'by which the connections from the
hydraulic locking bolts 53, 54 enter the relay cyl
- tween said jack and said accumulator; operating
valve means disposed in said connections to en
on the relay pistons 38 when the latter are fully`
retracted under the iniluenoe o1' their springs 38
able -the accumulator, when charged, to operate
the jack under the control of the operating valve
means; hydraulic actuating valve means and' a.
source ofA pressure; and piping independently
connecting said accumulator and said actuating
to allow the lift valves 2l to close.
valve means with said pressure source, and said
inders are surrounded by seatings 80 which are
arranged to be engaged by co-operating seatings
In operation, the first eiiîect of admission' of.
pressure to one of the actuating cylinders 35 is to
move the relay piston 36 off the central seating
6U and to admit control iluid under pressure to>
one of the bolt-withdrawing'cylinders 55 or 58, as
the case may be, so- that the jack is unlocked.
After a. short movement of the relay piston the
rod 31 engages the tappet 34 in the exhaust cyl
inder 3i oi' the valve and opens the lift-valve 24
to cause the jack to move. The other lift-valve
in the other operating-valve casing i8 or i9, as
the case may be, is, of course, at this time open
to drain pipe 33. The jacks are thus locked in
either of their end positions until the relay pis
tons are operated, whereupon they are first un
locked and then have pressure applied to them to ,
produce movement.
actuating valve meanswith said operating valve
means; locking means for retaining said jack in
a fixed position; and hydraulic fluid connections
from said operating valve means to said lock- t
ing means for actuating said locking means, said
second-named connections being independent of
the ilrst-named hydraulic connections between
saidvjack and said operating valve means; said
Second-named connections being supplied from
saidl actuating valve means, but the transmission
of operating pressure through said connections
to said locking means being controlled by the
movement of said operating valve means.
2. A hydraulic operating system, comprising,
in combination, a hydraulic jack; and accumu
lator adjacent said jack;` hydraulic connections
between said jack and said accumulator, operat
62 extends to a sump “to which also opens the
pipe l2 and from which the pump I6 draws its
ing valve means disposed in said connections to
_enable the accumulator, when charged, to oper
ate the jack under the control of the operating
valve means: hydraulic actuating valve means
and a source Lof pressure, and piping independent
ly connecting said accumulator and said actuating
supply. The pipe 82 should be of adequate di
valve means with said pressure source. and said
The drain pipe 3l is connected bya pipe El to
a main return pipe B2, the pipe 6l being a branch
from this so that only one return pipe l2 is need
ed to serve all the Jacks in the system. The pipe
ameter but is not under pressure and may be thin. Y
Also only one such pipe is required and if rup
tured it does not lead to any failure of opera
tion, only loss of fluid.
'I'he advantages of this lsystem may be sum- '
marised as followsz.,
actuating valve means with said operating valve
means; said operating valve means comprisins
controlled passageways for >pressure iiuid passing
from said accumulator to said jack, a valve ele
ment associated with said passageways, a valve
moving motor, and amotor chamber subject t0
fluid pressure from said actuating valve means;
1st. rapidity of operation.
2nd, convenience of control.
v 3rd, the :lacks are maintained in either of their
locking means for retaining said jack in a ñxed -
position, a conduit leadingv from said motor
extreme positions by direct pressure from the ac
chamber to said locking means, whereby said ac
4th, in case of breakage of the control pipe
work the gear remains with its position unaltered.
tuating valve means serves to actuate both the' '
`5th, only short lengths of'large diameter pipe
operating valve means and release said locking
means, and means for covering the inlet of the
conduit leading from said motor chamber to said
are required, the long lengths of pipe-work being
~ locking means, when the operating valve means
is idle, but which are moved to open said conduit
upon the initial movement of said motor means
1. a hydraulic operating system, comprising, 50 as pressure iiuid is admitted to said'motor cham
Vber from said actuating valve means. ’
in combination, a hydraulic jack; an accumulator
of small diameter and easily installed.
adjacent said jack; hydraulic connections be
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