CA1088848A - Jam proof piston - Google Patents
Jam proof pistonInfo
- Publication number
- CA1088848A CA1088848A CA301,898A CA301898A CA1088848A CA 1088848 A CA1088848 A CA 1088848A CA 301898 A CA301898 A CA 301898A CA 1088848 A CA1088848 A CA 1088848A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- cylinder
- sleeve
- piston rod
- bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C13/00—Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers
- B64C13/24—Transmitting means
- B64C13/38—Transmitting means with power amplification
- B64C13/50—Transmitting means with power amplification using electrical energy
- B64C13/505—Transmitting means with power amplification using electrical energy having duplication or stand-by provisions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J7/00—Piston-rods
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Actuator (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Holo Graphy (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
JAM PROOF PISTON
ABSTRACT OF THE DISCLOSURE
An improved jam-proof control including a cylinder-piston assembly in which the piston is controllably posi-tioned within the cylinder to perform the control function and in which the piston rod which extends through the cyl-inder wall is enveloped by a deformable sleeve so hat when the piston rod is deformed by sharp impact, the piston rod is permitted to continue to reciprocate within the housing due to the deformation, either due to frangibility or softness, of the piston rod sleeve.
The invention herein described was made in the course of or under a contract or subcontract thereunder, with the Department of the Army.
ABSTRACT OF THE DISCLOSURE
An improved jam-proof control including a cylinder-piston assembly in which the piston is controllably posi-tioned within the cylinder to perform the control function and in which the piston rod which extends through the cyl-inder wall is enveloped by a deformable sleeve so hat when the piston rod is deformed by sharp impact, the piston rod is permitted to continue to reciprocate within the housing due to the deformation, either due to frangibility or softness, of the piston rod sleeve.
The invention herein described was made in the course of or under a contract or subcontract thereunder, with the Department of the Army.
Description
BACKGROUND OF ~IE INVENTION
Fleld of InvQntion - This inven~ion relates to control mechanisms and particularly to those which perform the con-trol function by selectively positionlng a piston within a cylinder and with the piston rod extending through the cylinder wall so that its free end produces the control motion. Such controls are conventionally used on aircraft and other vehlcles in which jamming o~ the piston or piston rod within the cylinder produces control malfunction. One possible cause of piston or piston rod jamming within a ~-cylinder is the striking of the control by a projectile nn ~light wherein the ballistic damage caused by such a pro~
jectile in passing through the control cylinder may displace the cylinder material so as to impede piston~motion or cause piston ~amming, and may also pass through the piston rod so that the displaced piston rod material cannot pass through the aperture provided in the cylinder for that pur-pose, thereby also either eliminating piston motion or caus-ing plston rod and hence piston jamming. ~ ~
Description o~ the Prior Art - In the ~light control ~ .
art, attempts have been made in the past to reduce or elimi-nate the ballistic vulnerability of a ~light control by fabricating the cylinder and/or piston as armor utilizing ~
conventional armor~plate techniques. Such armor construction `~ -is shown in Sliney U. S. Patent No. 3,566,741 which teaches tubular armor plate formed ~rom an impact-resistant outer ~ . .
armor shell and a slightly softer inner armor shell. Such ,
Fleld of InvQntion - This inven~ion relates to control mechanisms and particularly to those which perform the con-trol function by selectively positionlng a piston within a cylinder and with the piston rod extending through the cylinder wall so that its free end produces the control motion. Such controls are conventionally used on aircraft and other vehlcles in which jamming o~ the piston or piston rod within the cylinder produces control malfunction. One possible cause of piston or piston rod jamming within a ~-cylinder is the striking of the control by a projectile nn ~light wherein the ballistic damage caused by such a pro~
jectile in passing through the control cylinder may displace the cylinder material so as to impede piston~motion or cause piston ~amming, and may also pass through the piston rod so that the displaced piston rod material cannot pass through the aperture provided in the cylinder for that pur-pose, thereby also either eliminating piston motion or caus-ing plston rod and hence piston jamming. ~ ~
Description o~ the Prior Art - In the ~light control ~ .
art, attempts have been made in the past to reduce or elimi-nate the ballistic vulnerability of a ~light control by fabricating the cylinder and/or piston as armor utilizing ~
conventional armor~plate techniques. Such armor construction `~ -is shown in Sliney U. S. Patent No. 3,566,741 which teaches tubular armor plate formed ~rom an impact-resistant outer ~ . .
armor shell and a slightly softer inner armor shell. Such ,
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8~
constructions proved to be unreasonably heavy and large, and therefore, unacceptable for aircra~t use ancl, further, they ~ -proved not to provide the desir~d ballistic-proof result. ~ -Simmons U. S~ Pa~ent NoO 3,884,127 teaches such a con-trol in which both the piston and the cylinder gland through which the piston rod extends are fabricated so as to be shearable so as to prevent piston or piston rod jamming.
The Simmons patent has the disadvantage, however, that such ~;
flight controls are required to be tested to demonstrate that their structural integrity is such ~hat they can with- - -stand without rupture or penmanent de~onmation 2.5 times the normal operating pressure which causes the pi~ton to re-ciprocate within the cylinder. This test requirement dic- ~;tates that the area of the piston must be at least 2-1/2 times the area of the cylinder gland to be able to demon- -strate such structural integrity and still result in a cyl-inder gland which is shearable under normal operating con~
ditions. This requirement that the piston area be at least 2-1/2 tlmes the gland area results in a control of larger envelope and a greater weight that would otherwise be neces-sary. This envelope and weight problem is added to by the fact that larger hydraulic chambers fonmed by such a piston require the use of more operating fluid~ with the attendant requirement for a larger ~luid supply and dispensing system.
In addltion, such a large piston generates larger-than-normal operating ~orces which must be reacted by the re-mainder of the control system so that the remainder of the
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constructions proved to be unreasonably heavy and large, and therefore, unacceptable for aircra~t use ancl, further, they ~ -proved not to provide the desir~d ballistic-proof result. ~ -Simmons U. S~ Pa~ent NoO 3,884,127 teaches such a con-trol in which both the piston and the cylinder gland through which the piston rod extends are fabricated so as to be shearable so as to prevent piston or piston rod jamming.
The Simmons patent has the disadvantage, however, that such ~;
flight controls are required to be tested to demonstrate that their structural integrity is such ~hat they can with- - -stand without rupture or penmanent de~onmation 2.5 times the normal operating pressure which causes the pi~ton to re-ciprocate within the cylinder. This test requirement dic- ~;tates that the area of the piston must be at least 2-1/2 times the area of the cylinder gland to be able to demon- -strate such structural integrity and still result in a cyl-inder gland which is shearable under normal operating con~
ditions. This requirement that the piston area be at least 2-1/2 tlmes the gland area results in a control of larger envelope and a greater weight that would otherwise be neces-sary. This envelope and weight problem is added to by the fact that larger hydraulic chambers fonmed by such a piston require the use of more operating fluid~ with the attendant requirement for a larger ~luid supply and dispensing system.
In addltion, such a large piston generates larger-than-normal operating ~orces which must be reacted by the re-mainder of the control system so that the remainder of the
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34~3 control system must be correspondingly strengthened, further increasing the welght problem.
SUMMARY OF THE_INVENTION
A primary object of the present invention is to provide a control, including a cylinder/piston assembly, which is capable o~ withstanding the required structural integrity testing, which is of minimum weight and size~ and which is capable of operation wi~hout piston or piston rod jamming when the piston rod is deformed for any reasong particularly - -by a ballistic impact.
According to the present invention, the cylinder is fabricated so as to be able to withstand ~he required tes~
loading at desired cylinder size and the piston rod is fab-ricated so as to be enveloped by a deformable sleeve which snugly envelops the piston rod and which passes through and ~;
is able to reciprocate within the hoasing aperture conven- `~
tionally provided for that purpose while maintaining sealing -integrity.
In accordance with a further aspect of the present in~
vention, the piston rod enveloping sleeve is fabricated to either be frangible so that it disintegrates upon ballistic ~;
impact or to be of a soft material which, once defonmed by ballistic impact, will be further deformed in passing through the cylinder aperture so as to permit continued mo-tion of the pLston rod and piston within the cylinder, thereby permitting continued control function. ;~
It is an important feature of this invention that the
34~3 control system must be correspondingly strengthened, further increasing the welght problem.
SUMMARY OF THE_INVENTION
A primary object of the present invention is to provide a control, including a cylinder/piston assembly, which is capable o~ withstanding the required structural integrity testing, which is of minimum weight and size~ and which is capable of operation wi~hout piston or piston rod jamming when the piston rod is deformed for any reasong particularly - -by a ballistic impact.
According to the present invention, the cylinder is fabricated so as to be able to withstand ~he required tes~
loading at desired cylinder size and the piston rod is fab-ricated so as to be enveloped by a deformable sleeve which snugly envelops the piston rod and which passes through and ~;
is able to reciprocate within the hoasing aperture conven- `~
tionally provided for that purpose while maintaining sealing -integrity.
In accordance with a further aspect of the present in~
vention, the piston rod enveloping sleeve is fabricated to either be frangible so that it disintegrates upon ballistic ~;
impact or to be of a soft material which, once defonmed by ballistic impact, will be further deformed in passing through the cylinder aperture so as to permit continued mo-tion of the pLston rod and piston within the cylinder, thereby permitting continued control function. ;~
It is an important feature of this invention that the
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wall thickness of the sl~ve envelopincJ the piston rod be sufficient that anticipated piston rod deforma~ion due to ball.istic hit will not extend radially outwardly therebeyond, and therefore the deformed piston rod will be able to continue to reciprocate through the cylinder aperture.
It is an important feature of this invention that the frangible sleeve i~ not a structural member and that the piston rod carries all loading and provides interior support for the frangible sleeveO
It is still a further object of this invention to ~ ..
teach such a construction in which the piston rod enveloping .
sleeve is loaded solely in compression and ha~ the required flexibility to permit the required thermal expansion and the anticipated load deformation of the piston rodO
In accordance with a specific embodiment, a control includes 1) a cylinder-piston~assembly comprising aO a cylinder having a bore portion, b~ a piston positioned in said cylinder `::
bore fo~ reciprocation therewithin and definin~ a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, do a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end -wall of said pressure chamber, e. a nonstructural, frangible sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and frangibility so ~hat when said sleeve and piston rod are.subjected to sharp impact, the piston rod will deform and the sleeve will disintegrate, at least in the vicinity .
of the sharp impact and the piston rod deformation, and the piston rod so de~rme.d will.be able to pass through the wall member . . ' aperture with the sleeve so disintegrated, .,y~ .
wall thickness of the sl~ve envelopincJ the piston rod be sufficient that anticipated piston rod deforma~ion due to ball.istic hit will not extend radially outwardly therebeyond, and therefore the deformed piston rod will be able to continue to reciprocate through the cylinder aperture.
It is an important feature of this invention that the frangible sleeve i~ not a structural member and that the piston rod carries all loading and provides interior support for the frangible sleeveO
It is still a further object of this invention to ~ ..
teach such a construction in which the piston rod enveloping .
sleeve is loaded solely in compression and ha~ the required flexibility to permit the required thermal expansion and the anticipated load deformation of the piston rodO
In accordance with a specific embodiment, a control includes 1) a cylinder-piston~assembly comprising aO a cylinder having a bore portion, b~ a piston positioned in said cylinder `::
bore fo~ reciprocation therewithin and definin~ a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, do a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end -wall of said pressure chamber, e. a nonstructural, frangible sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and frangibility so ~hat when said sleeve and piston rod are.subjected to sharp impact, the piston rod will deform and the sleeve will disintegrate, at least in the vicinity .
of the sharp impact and the piston rod deformation, and the piston rod so de~rme.d will.be able to pass through the wall member . . ' aperture with the sleeve so disintegrated, .,y~ .
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-2~ a fluid pressure source connect~d to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly ~o cause said piston to reciprocate within said cylinder when said piston rod is so deformed and said sleeve so disintegrated due to sharp impact~
In accordance with a further embodiment, a control includes 1) a cylinder-piston assembly comprising: aO a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereo within said boxe, c~ a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, do a fixed wall member supported from said cylinder and having an aperture envelop-ing said pis~on rod and constituting the structural ena.wall o~
said pressure chamber, e. a nonstructural, deformable sleeve snu~ly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness ;~
and deformability so that when said sleeve and piston rod are :~;
subjected to sharp impact, the sleeve will deform and the piston rod so deformed will be able to pass through the wall member aperture with the sleeve so deformed, 2) a fluid pressure source connec'~ed to said pressure chamber to cause said piston ~
to move within said cylinder during normal operation, and 3) a ~ ;
1uid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder with said piston rod and said sleeve so deformed due to : :
sharp impact, and 4) wherein said sleeve is fabricated of soft material so as to deform upon sharp impact and so as to deform upon :
contact with said wall member aperture in response to the actuating pressure of said actuator means causing said-piston to -reciprocate to permit said piston rod and hence said piston to :~
continue to reciprocate. :~
5a - :
In accordance wi~h a ~till urther ~odim~nt, a control includes 1~ a cylinder-pi-~on assembly comprising:
a~ a cyli~der having a cylindrical bore and an end wall member having a cylindrical aperture thereln concentric with said cylinder bore, b~ a piston-piston rod a~sembly including: lo a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at leas~ one side thereof within said bore, 2~ a piston rod o~
circular cros~ sec~ion, concentric with, attached to, and 10. extendin~ from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a s~ation external thereof, 3O said cylinder bore, cylindrical aperture, piston ;
and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, c. a nonstructural, frangible sleeve snugly supported in said annular :
passage to seal thereacross and being of selected wall thickness and frangibility so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will disintegrate, at least in the vicinity of the sharp imp'act, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be ;~
able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure cha~ber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so disintegrated due to sharp impact~ :
In accordance with a still further e~bodiment, a control includes 1) a cylindex-piston assembly comprising ~
aO a cylinder having a cylindrical bore and an end wall men~er :
having a cylindrical aperture therein concentric with said - 5 b -cylinder bore, bo a p~ston piston rod asse~ly including: lu a cylindrical pis~on posltioned in said cylinder bore for reciprocation therewithin and deining a pre~sure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, concentric with, attached to, and extend-ing ~rom said piston longitudinally along said bore, through said cylindrical aper~ure, and terminating at a station external thereof, 3~ sa~ cylinder bore, cylindrical aperture, piston . and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, cO a nonstructu~al, deformable sleeve snugly supported in said annular passage to seal thereacross and being of selectad wall thicXness and deformability so that when said sleeve and cylir.der-piston assembly are subjected to sharp impact, the cylinder-piston assembly : ~:
will deform and the sleeve will deform, at leas~ in the vicinity : ;
.~,: .;
of the sharp impact, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so deformed, 2) a fluid pressure source ~:
connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, 3) a fluid actuator.means operatively connected to said cylinder~piston assembly to cause said pis~on to reciprocate within said ::
cylinder when said cylinder-piston assembly is so de~ormed and said sleeve so deformed due to sharp impact, and 4) wherein :
said sleeve is ~abricated of soft material so as to deform upon ~
qharp impact and so as to deform upon contact with said cylinder- 1.
piston assembly in response to t~e actuating;pressure of ~aid actuator means causing said piston to reciprocate to permit said piston-piston rod assembly to continue to reciprocat~.
.
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Other ob~ect~ and ~dvantages oE the pre~ent invention may be ~een by referring to the following description and claims, re.ad i~ conjunc~ion with the accompanying drawings-BRIEF DESCRIP~ION OF T~E DRAWING
... . . . . _ Figure 1 is a cross-sectional sho~ing of a control system of the flight variety utilizing my invention~ ;
Figure 2 is an enlarged and partial showing of such a control system to better illustrate the construckion of-the piston rod and the manner in which it extends through the cylinder housing aperture~
Figure 3 is a fragmentary showing o~ a piston rod following balli~tic impact.
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DESCRIPTION OF T~IE PREFERRED EMBODIMENT
Referring to Fig. l we see a typlcal control lO of the flight variety which includes two cylinder-piston assemblies 12 and 14 operating in parallel, so as to provide system redundancy, and which coact to position a control element 16, which is operably connected ~o and controls the posi-tion of the mechanism under control, such as flight surface 18. Cylinder-piston assemblies 12 and 14 are preferably identical in construction and operation so ~hat cylinder-piston assembly 12 only will-be described. Assembly 12 in-cludes cylinder or cylindrical housing 20, which in con-ventional fashion, envelops piston 22 so as to cooperate therewith in forming pressure chambers 24 and 26 on opposite sides thereof.
In conventional fashion, piston rod 28, which may be solid or hollow, extends from piston 22 to a station ex- -~
ternal of cylinder 20 so tha~ its ~ree end 30 engages con-trol memberl6. Gland ring 32 constitutes the cylinder wall which envelops piston rod 28. As best shown in Fig. 2, gland ring 32 is structurally supported from cylinder 20 in that ring 32 abuts cylinder stop 34 and is held there-against by retainer ring 36, which threadably engages hous-ing 20. 0-rings 38 and 40 serve as a seal between the outer periphery of ring 32 and housing 20 and conventional dynamic rod seals 42 and 44 seal between the inner periphery of gland ring 32 and piston rod 28. Wiper ring 46 is con-nected to gland 32 and serves its conventional - . . . . . . :. ~ . . - .
anti-contaminant function.
Hydraulic controls 48, whlch are uncler pllot control, serve to control the pressure ln chambers 24 and 26 and hence the preciprocating motion of piston 22 and piston rod 28 within cylinder 20.
It will be evident to those skilled in the art that while control 10 is shown to be hydraulically operated, it could as well be pneumatically operated, and that cylinder-piston assemblies 12 and 24 could as well operate in a con-ventional series relationship rather ~han the il~-lustrated parallel relationship. A single cylinder arrangement could ~ '~
be used with appropria~e pilot manual inter~onnect so that the pilot can manually provide the force required to ac-tuate the piston following ballistic hit.
It will be evident by viewing Fig. 1 that as piston 22 `
is caused ~o reciprocate within cylinder 20, piston rod 28 reciprocates therewith so that its free end 30 causes con~
:.. ~, . . ~ .
trol member 16 to position control surface~ 18 in accord~
ance with the dictates of control 10.
Referring to Fig. 2~ we see the construction of cyl-inder-piston assembly 12 in greater particularity. It will be noted that sleeve member 50 snugly envelops piston rod 28, and is~ in return, snugly enveloped by gland or cyl~
inder end wall 32. During normal operation, as piston 22 ~ -reciprocates within cylinder 20, sleeve 50 sealably en- ~
gages gland ring 32 as piston rod 28 reciprocates therein. ~-The ~unction of sleeve 50 is to prevent jamming of piston rod 28 within gland 32 if the piston rod is deformed for : . . ,: ~ . ........................... . . ~ -- . .
any reason, such as ballistic lmpact. Sleeve 50 is o~
selected wall thickness and fabricated o~ ~rangi~le, i.e.
brittle, material so as to disintegrate by fragmentation upon ballistic impact so that, as best shown in Fig~ 3, with the piston rod 28 so deformed by ballistic impact and the adjacent portion of sleeve 50 dlsintegrated, the anti-cipated de~ormation of piston rod 50 is such that, in de-formed orientation, piston rod 28 will not extend outwardly beyond the inner diameter of gland 32. In view of this construction, piston rod 28 can continue to reciprocate within gland 32 and hence the control function of control 10 can continue, despite ballistic hit. If actuating pressure is lost due to ~he ballistic hit in cylinder-piston assembly 12, actuation of the control can continue with cylinder-piston 14 generating the operating force.
In an alternate form, sleeve 50 is made of a soft material so that it will deform with the piston rod 28 upon ballistic impact and it will de:Eorm further upon con-tact wi~h gland 32 during attempted piston reciprocation to permit continued reciprocation of piston rod 28 and hence, piston 22.
As used herein~ deformable as relating to sleeve 50 means either frangible so that sleeve 50 fragments or dis-integrates upon sharp contact, or soft so that sleeve 50 changes shape in response to sharp contact and further de-forms to pass through the interior of gland 32 in response ~
to actuating pressure. `
~ 8 In the frangible sleeve embodlment, sleeve 50 can be made of beryllium copper or ~1-11 steel. In installations where thermal e~pansion is not anticipated in piston rod 28 or no substantial piston rod deformation due to loading takes place, sleeve 50 could be made of a brittle material, such as glass. In the soft sleeve modification, sleeve 50 may be fabricated of carbon~ boron or a structural plastic, such as DuPont's Kevlar~ or of a composite material, such as adhesively bonded layers of fiberglass.
Sleeve 50 is loaded in compression only, and all actu- ~
ating loads go through piston rod 28. Sleeve 50 can accept ~ `
compression loading since piston rod 28 is providing interior ;
structural support therefor.
In determining the inner diameter of gland 32 and the wall thickness o~ sleeve 50, the amount of piston rod de~
formation anticipated, such as petalling, can be d~-~ermined by test. The amount of piston rod defonmation is determined ;~
by the type of material of which it is made and the speed and caliber of the projectile of concern.
So that the deformation of cylinder 20 by ballistic im-pact does not cause piston jamming, piston 22 is preferably made of shearable construction, as in Simmons Patent No.
3,884,127.
I wish it to be understood that I do not desire to be limited to the exact details of construction shown and de~
scribed, for obvious modiflcatlons will occur to a person skilled in the art.
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-2~ a fluid pressure source connect~d to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly ~o cause said piston to reciprocate within said cylinder when said piston rod is so deformed and said sleeve so disintegrated due to sharp impact~
In accordance with a further embodiment, a control includes 1) a cylinder-piston assembly comprising: aO a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereo within said boxe, c~ a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, do a fixed wall member supported from said cylinder and having an aperture envelop-ing said pis~on rod and constituting the structural ena.wall o~
said pressure chamber, e. a nonstructural, deformable sleeve snu~ly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness ;~
and deformability so that when said sleeve and piston rod are :~;
subjected to sharp impact, the sleeve will deform and the piston rod so deformed will be able to pass through the wall member aperture with the sleeve so deformed, 2) a fluid pressure source connec'~ed to said pressure chamber to cause said piston ~
to move within said cylinder during normal operation, and 3) a ~ ;
1uid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder with said piston rod and said sleeve so deformed due to : :
sharp impact, and 4) wherein said sleeve is fabricated of soft material so as to deform upon sharp impact and so as to deform upon :
contact with said wall member aperture in response to the actuating pressure of said actuator means causing said-piston to -reciprocate to permit said piston rod and hence said piston to :~
continue to reciprocate. :~
5a - :
In accordance wi~h a ~till urther ~odim~nt, a control includes 1~ a cylinder-pi-~on assembly comprising:
a~ a cyli~der having a cylindrical bore and an end wall member having a cylindrical aperture thereln concentric with said cylinder bore, b~ a piston-piston rod a~sembly including: lo a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at leas~ one side thereof within said bore, 2~ a piston rod o~
circular cros~ sec~ion, concentric with, attached to, and 10. extendin~ from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a s~ation external thereof, 3O said cylinder bore, cylindrical aperture, piston ;
and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, c. a nonstructural, frangible sleeve snugly supported in said annular :
passage to seal thereacross and being of selected wall thickness and frangibility so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will disintegrate, at least in the vicinity of the sharp imp'act, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be ;~
able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure cha~ber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so disintegrated due to sharp impact~ :
In accordance with a still further e~bodiment, a control includes 1) a cylindex-piston assembly comprising ~
aO a cylinder having a cylindrical bore and an end wall men~er :
having a cylindrical aperture therein concentric with said - 5 b -cylinder bore, bo a p~ston piston rod asse~ly including: lu a cylindrical pis~on posltioned in said cylinder bore for reciprocation therewithin and deining a pre~sure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, concentric with, attached to, and extend-ing ~rom said piston longitudinally along said bore, through said cylindrical aper~ure, and terminating at a station external thereof, 3~ sa~ cylinder bore, cylindrical aperture, piston . and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, cO a nonstructu~al, deformable sleeve snugly supported in said annular passage to seal thereacross and being of selectad wall thicXness and deformability so that when said sleeve and cylir.der-piston assembly are subjected to sharp impact, the cylinder-piston assembly : ~:
will deform and the sleeve will deform, at leas~ in the vicinity : ;
.~,: .;
of the sharp impact, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so deformed, 2) a fluid pressure source ~:
connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, 3) a fluid actuator.means operatively connected to said cylinder~piston assembly to cause said pis~on to reciprocate within said ::
cylinder when said cylinder-piston assembly is so de~ormed and said sleeve so deformed due to sharp impact, and 4) wherein :
said sleeve is ~abricated of soft material so as to deform upon ~
qharp impact and so as to deform upon contact with said cylinder- 1.
piston assembly in response to t~e actuating;pressure of ~aid actuator means causing said piston to reciprocate to permit said piston-piston rod assembly to continue to reciprocat~.
.
, . - 5 c -. . - . ., ~ .. ~ ~
Other ob~ect~ and ~dvantages oE the pre~ent invention may be ~een by referring to the following description and claims, re.ad i~ conjunc~ion with the accompanying drawings-BRIEF DESCRIP~ION OF T~E DRAWING
... . . . . _ Figure 1 is a cross-sectional sho~ing of a control system of the flight variety utilizing my invention~ ;
Figure 2 is an enlarged and partial showing of such a control system to better illustrate the construckion of-the piston rod and the manner in which it extends through the cylinder housing aperture~
Figure 3 is a fragmentary showing o~ a piston rod following balli~tic impact.
.':
-5d -- ' .... . . ..
DESCRIPTION OF T~IE PREFERRED EMBODIMENT
Referring to Fig. l we see a typlcal control lO of the flight variety which includes two cylinder-piston assemblies 12 and 14 operating in parallel, so as to provide system redundancy, and which coact to position a control element 16, which is operably connected ~o and controls the posi-tion of the mechanism under control, such as flight surface 18. Cylinder-piston assemblies 12 and 14 are preferably identical in construction and operation so ~hat cylinder-piston assembly 12 only will-be described. Assembly 12 in-cludes cylinder or cylindrical housing 20, which in con-ventional fashion, envelops piston 22 so as to cooperate therewith in forming pressure chambers 24 and 26 on opposite sides thereof.
In conventional fashion, piston rod 28, which may be solid or hollow, extends from piston 22 to a station ex- -~
ternal of cylinder 20 so tha~ its ~ree end 30 engages con-trol memberl6. Gland ring 32 constitutes the cylinder wall which envelops piston rod 28. As best shown in Fig. 2, gland ring 32 is structurally supported from cylinder 20 in that ring 32 abuts cylinder stop 34 and is held there-against by retainer ring 36, which threadably engages hous-ing 20. 0-rings 38 and 40 serve as a seal between the outer periphery of ring 32 and housing 20 and conventional dynamic rod seals 42 and 44 seal between the inner periphery of gland ring 32 and piston rod 28. Wiper ring 46 is con-nected to gland 32 and serves its conventional - . . . . . . :. ~ . . - .
anti-contaminant function.
Hydraulic controls 48, whlch are uncler pllot control, serve to control the pressure ln chambers 24 and 26 and hence the preciprocating motion of piston 22 and piston rod 28 within cylinder 20.
It will be evident to those skilled in the art that while control 10 is shown to be hydraulically operated, it could as well be pneumatically operated, and that cylinder-piston assemblies 12 and 24 could as well operate in a con-ventional series relationship rather ~han the il~-lustrated parallel relationship. A single cylinder arrangement could ~ '~
be used with appropria~e pilot manual inter~onnect so that the pilot can manually provide the force required to ac-tuate the piston following ballistic hit.
It will be evident by viewing Fig. 1 that as piston 22 `
is caused ~o reciprocate within cylinder 20, piston rod 28 reciprocates therewith so that its free end 30 causes con~
:.. ~, . . ~ .
trol member 16 to position control surface~ 18 in accord~
ance with the dictates of control 10.
Referring to Fig. 2~ we see the construction of cyl-inder-piston assembly 12 in greater particularity. It will be noted that sleeve member 50 snugly envelops piston rod 28, and is~ in return, snugly enveloped by gland or cyl~
inder end wall 32. During normal operation, as piston 22 ~ -reciprocates within cylinder 20, sleeve 50 sealably en- ~
gages gland ring 32 as piston rod 28 reciprocates therein. ~-The ~unction of sleeve 50 is to prevent jamming of piston rod 28 within gland 32 if the piston rod is deformed for : . . ,: ~ . ........................... . . ~ -- . .
any reason, such as ballistic lmpact. Sleeve 50 is o~
selected wall thickness and fabricated o~ ~rangi~le, i.e.
brittle, material so as to disintegrate by fragmentation upon ballistic impact so that, as best shown in Fig~ 3, with the piston rod 28 so deformed by ballistic impact and the adjacent portion of sleeve 50 dlsintegrated, the anti-cipated de~ormation of piston rod 50 is such that, in de-formed orientation, piston rod 28 will not extend outwardly beyond the inner diameter of gland 32. In view of this construction, piston rod 28 can continue to reciprocate within gland 32 and hence the control function of control 10 can continue, despite ballistic hit. If actuating pressure is lost due to ~he ballistic hit in cylinder-piston assembly 12, actuation of the control can continue with cylinder-piston 14 generating the operating force.
In an alternate form, sleeve 50 is made of a soft material so that it will deform with the piston rod 28 upon ballistic impact and it will de:Eorm further upon con-tact wi~h gland 32 during attempted piston reciprocation to permit continued reciprocation of piston rod 28 and hence, piston 22.
As used herein~ deformable as relating to sleeve 50 means either frangible so that sleeve 50 fragments or dis-integrates upon sharp contact, or soft so that sleeve 50 changes shape in response to sharp contact and further de-forms to pass through the interior of gland 32 in response ~
to actuating pressure. `
~ 8 In the frangible sleeve embodlment, sleeve 50 can be made of beryllium copper or ~1-11 steel. In installations where thermal e~pansion is not anticipated in piston rod 28 or no substantial piston rod deformation due to loading takes place, sleeve 50 could be made of a brittle material, such as glass. In the soft sleeve modification, sleeve 50 may be fabricated of carbon~ boron or a structural plastic, such as DuPont's Kevlar~ or of a composite material, such as adhesively bonded layers of fiberglass.
Sleeve 50 is loaded in compression only, and all actu- ~
ating loads go through piston rod 28. Sleeve 50 can accept ~ `
compression loading since piston rod 28 is providing interior ;
structural support therefor.
In determining the inner diameter of gland 32 and the wall thickness o~ sleeve 50, the amount of piston rod de~
formation anticipated, such as petalling, can be d~-~ermined by test. The amount of piston rod defonmation is determined ;~
by the type of material of which it is made and the speed and caliber of the projectile of concern.
So that the deformation of cylinder 20 by ballistic im-pact does not cause piston jamming, piston 22 is preferably made of shearable construction, as in Simmons Patent No.
3,884,127.
I wish it to be understood that I do not desire to be limited to the exact details of construction shown and de~
scribed, for obvious modiflcatlons will occur to a person skilled in the art.
:~-_ g~
Claims (14)
1. A control including;
1) a cylinder-piston assembly comprising:
a. a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, d. a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end wall of said pressure chamber, e. a nonstructural, frangible sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and frangibility so that when said sleeve and piston rod are subjected to sharp impact, the piston rod will deform and the sleeve will disintegrate, at least in the vicinity of the sharp impact and the piston rod deformation, and the piston rod so deformed will be able to pass through the wall member aperature with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said piston rod is so deformed and said sleeve so disintegrated due to sharp impact.
1) a cylinder-piston assembly comprising:
a. a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudinally along said bore and terminating at a station external thereof, d. a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end wall of said pressure chamber, e. a nonstructural, frangible sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and frangibility so that when said sleeve and piston rod are subjected to sharp impact, the piston rod will deform and the sleeve will disintegrate, at least in the vicinity of the sharp impact and the piston rod deformation, and the piston rod so deformed will be able to pass through the wall member aperature with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said piston rod is so deformed and said sleeve so disintegrated due to sharp impact.
2. A control including:
1) a cylinder-piston assembly comprising:
a. a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudi-nally along said bore and terminating at a station external thereof, d. a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end wall of said pressure chamber, e. a nonstructural, deformable sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and deformability so that when said sleeve and piston rod are subjected to sharp impact, the sleeve will deform and the piston rod so deformed will be able to pass through the wall member aperture with the sleeve so deformed, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder with said piston rod and within said cylinder with said sharp impact, and 4) wherein said sleeve is fabricated of soft material so as to deform upon sharp impact and so as to deform upon contact with said wall member aperture in response means causing said piston to reciprocate actuator means causing said piston to reciprocate to permit said piston rod and hence said piston to continue to reciprocate.
1) a cylinder-piston assembly comprising:
a. a cylinder having a bore portion, b. a piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, c. a piston rod extending from said piston longitudi-nally along said bore and terminating at a station external thereof, d. a fixed wall member supported from said cylinder and having an aperture enveloping said piston rod and constituting the structural end wall of said pressure chamber, e. a nonstructural, deformable sleeve snugly enveloping said piston rod and being snugly enveloped by said wall member aperture and being of selected wall thickness and deformability so that when said sleeve and piston rod are subjected to sharp impact, the sleeve will deform and the piston rod so deformed will be able to pass through the wall member aperture with the sleeve so deformed, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder with said piston rod and within said cylinder with said sharp impact, and 4) wherein said sleeve is fabricated of soft material so as to deform upon sharp impact and so as to deform upon contact with said wall member aperture in response means causing said piston to reciprocate actuator means causing said piston to reciprocate to permit said piston rod and hence said piston to continue to reciprocate.
3. A control according to claim 1 wherein said actuator means and said cylinder-piston assembly are identical.
4. A control according to claim 2 wherein said actuator means and said cylinder-piston assembly are identical.
5. A control according to any one of claims 1 or 2 wherein said sleeve is made of beryllium copper.
6. A control according to any one of claims 1 or 2 wherein said sleeve is made of H-11 steel.
7. A control according to any one of claims 3 or 4 wherein said sleeve is made of carbon or boron.
8. A control including:
1) a cylinder-piston assembly comprising:
a. a cylinder having a cylindrical bore and an end wall member having a cylindrical aperture therein concentric with said cylinder bore, b. a piston-piston rod assembly including:
1. a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, concentric with, attached to, and extending from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a station external thereof, 3. said cylinder bore, clyindrical aperture, piston and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween.
c. a nonstructural, frangible sleeve snugly supported in said annular passage to seal thereacross and being of selected wall thickness and frangibility so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will disintegrate, at least in the vicinity of the sharp impact, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so disintegrated due to sharp impact.
1) a cylinder-piston assembly comprising:
a. a cylinder having a cylindrical bore and an end wall member having a cylindrical aperture therein concentric with said cylinder bore, b. a piston-piston rod assembly including:
1. a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, concentric with, attached to, and extending from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a station external thereof, 3. said cylinder bore, clyindrical aperture, piston and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween.
c. a nonstructural, frangible sleeve snugly supported in said annular passage to seal thereacross and being of selected wall thickness and frangibility so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will disintegrate, at least in the vicinity of the sharp impact, and the cylinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so disintegrated, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, and 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so disintegrated due to sharp impact.
9. A control including:
1) a cylinder-piston assembly comprising:
a. a cylinder having a cylindrical bore and an end wall member having a cylindrical aperture therein concentric with said cylinder bore, b. a piston-piston rod assembly including:
1. a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, con-centric with, attached to, and extending from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a station external thereof, 3. said cylinder bore, cylindrical aperture, piston and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, c. a nonstructural, deformable sleeve snugly supported in said annular passage to seal there-across and being of selected wall thickness and deformability so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will deform, at least in the vicinity of the sharp impact, and the clyinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so deformed, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so deformed due to sharp impact, and 4) wherein said sleeve is fabricated of soft material so to deform upon sharp impact and so as to deform upon contact with said cylinder-piston assembly in response to the actuating pressure of said actuator means causing said piston to reciprocate to permit said piston-piston rod assembly to continue to reciprocate.
1) a cylinder-piston assembly comprising:
a. a cylinder having a cylindrical bore and an end wall member having a cylindrical aperture therein concentric with said cylinder bore, b. a piston-piston rod assembly including:
1. a cylindrical piston positioned in said cylinder bore for reciprocation therewithin and defining a pressure chamber on at least one side thereof within said bore, 2. a piston rod of circular cross section, con-centric with, attached to, and extending from said piston longitudinally along said bore, through said cylindrical aperture, and terminating at a station external thereof, 3. said cylinder bore, cylindrical aperture, piston and piston rod being selectively dimensioned to define at least one annular passage of selected dimension therebetween, c. a nonstructural, deformable sleeve snugly supported in said annular passage to seal there-across and being of selected wall thickness and deformability so that when said sleeve and cylinder-piston assembly are subjected to sharp impact, the cylinder-piston assembly will deform and the sleeve will deform, at least in the vicinity of the sharp impact, and the clyinder-piston assembly deformation, and the piston-piston rod assembly will be able to reciprocate within said cylinder with said cylinder-piston assembly so deformed and with the sleeve so deformed, 2) a fluid pressure source connected to said pressure chamber to cause said piston to move within said cylinder during normal operation, 3) a fluid actuator means operatively connected to said cylinder-piston assembly to cause said piston to reciprocate within said cylinder when said cylinder-piston assembly is so deformed and said sleeve so deformed due to sharp impact, and 4) wherein said sleeve is fabricated of soft material so to deform upon sharp impact and so as to deform upon contact with said cylinder-piston assembly in response to the actuating pressure of said actuator means causing said piston to reciprocate to permit said piston-piston rod assembly to continue to reciprocate.
10. A control according to claim 8 wherein said sleeve is made of beryllium copper.
11. A control according to claim 9 wherein said sleeve is made of H-11 steel.
12. A control according to claim 8 wherein said sleeve is made of carbon or boron.
13. A control according to claim 8 wherein said actuator means and said cylinder-piston assembly are identical.
14. A control according to claim 9 wherein said actuator means and said cylinder-piston assembly are identical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80076677A | 1977-05-26 | 1977-05-26 | |
| US800,766 | 1977-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1088848A true CA1088848A (en) | 1980-11-04 |
Family
ID=25179297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA301,898A Expired CA1088848A (en) | 1977-05-26 | 1978-04-25 | Jam proof piston |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS53147178A (en) |
| AU (1) | AU519050B2 (en) |
| BE (1) | BE867408A (en) |
| CA (1) | CA1088848A (en) |
| CH (1) | CH635170A5 (en) |
| DE (1) | DE2820449A1 (en) |
| FR (1) | FR2392262A1 (en) |
| GB (1) | GB1584939A (en) |
| IL (1) | IL54628A (en) |
| IT (1) | IT1095641B (en) |
| NL (1) | NL7805752A (en) |
| NO (1) | NO781754L (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN166825B (en) * | 1985-04-30 | 1990-07-21 | Dowty Boulton Paul Ltd | |
| FR3003327B1 (en) * | 2013-03-13 | 2015-07-31 | Eurocopter France | SHUT OFF DEVICE OF A HYDRAULIC SYSTEM HYDRAULIC SYSTEM AND AIRCRAFT |
| CA2976228C (en) * | 2015-02-20 | 2019-07-16 | Peter G. MORICE | Pneumatic actuation system and method |
| WO2019154579A1 (en) | 2018-02-09 | 2019-08-15 | Vat Holding Ag | Piston-cylinder unit |
| CN110873087B (en) * | 2018-08-29 | 2021-10-22 | 宁波市鑫潮自动化元件有限公司 | Cylinder with adjustable piston rod control position |
| FR3144971A1 (en) * | 2023-01-18 | 2024-07-19 | Dassault Aviation | Servo control intended for controlling the position of a moving element of an aircraft |
| FR3144970A1 (en) * | 2023-01-18 | 2024-07-19 | Dassault Aviation | Servo control intended for controlling the position of a moving element of an aircraft made of two distinct materials |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2307067A (en) * | 1941-04-28 | 1943-01-05 | Charles L Paulus | Servo cylinder |
| US3695149A (en) * | 1970-10-23 | 1972-10-03 | Walter W Eberhart | Seal for ram |
| NL156490B (en) * | 1975-04-04 | 1978-04-17 | Hydraudyne Bv | PULLING CYLINDER IN WHICH THE PISTON IS CONNECTED TO A CABLE SERVING AS A PISTON ROD. |
-
1978
- 1978-04-25 CA CA301,898A patent/CA1088848A/en not_active Expired
- 1978-05-02 AU AU35665/78A patent/AU519050B2/en not_active Expired
- 1978-05-03 IL IL54628A patent/IL54628A/en unknown
- 1978-05-05 GB GB17879/78A patent/GB1584939A/en not_active Expired
- 1978-05-10 DE DE19782820449 patent/DE2820449A1/en not_active Withdrawn
- 1978-05-17 CH CH532978A patent/CH635170A5/en not_active IP Right Cessation
- 1978-05-17 JP JP5871178A patent/JPS53147178A/en active Pending
- 1978-05-22 NO NO78781754A patent/NO781754L/en unknown
- 1978-05-24 IT IT23727/78A patent/IT1095641B/en active
- 1978-05-24 BE BE187979A patent/BE867408A/en not_active IP Right Cessation
- 1978-05-25 FR FR7815998A patent/FR2392262A1/en active Pending
- 1978-05-26 NL NL7805752A patent/NL7805752A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NL7805752A (en) | 1978-11-28 |
| IL54628A (en) | 1981-01-30 |
| IT7823727A0 (en) | 1978-05-24 |
| DE2820449A1 (en) | 1978-12-07 |
| JPS53147178A (en) | 1978-12-21 |
| GB1584939A (en) | 1981-02-18 |
| FR2392262A1 (en) | 1978-12-22 |
| IL54628A0 (en) | 1978-07-31 |
| AU3566578A (en) | 1979-11-08 |
| AU519050B2 (en) | 1981-11-05 |
| CH635170A5 (en) | 1983-03-15 |
| BE867408A (en) | 1978-09-18 |
| NO781754L (en) | 1978-11-28 |
| IT1095641B (en) | 1985-08-10 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |