EP3611389A1 - Linear actuator with locking and tamper-proof locking device - Google Patents

Linear actuator with locking and tamper-proof locking device Download PDF

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Publication number
EP3611389A1
EP3611389A1 EP19190472.1A EP19190472A EP3611389A1 EP 3611389 A1 EP3611389 A1 EP 3611389A1 EP 19190472 A EP19190472 A EP 19190472A EP 3611389 A1 EP3611389 A1 EP 3611389A1
Authority
EP
European Patent Office
Prior art keywords
locking
finger
indicator
rod
locking finger
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.)
Granted
Application number
EP19190472.1A
Other languages
German (de)
French (fr)
Other versions
EP3611389B1 (en
Inventor
Christelle PETTENAZZI
Laurent MONSAINT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Landing Systems SAS
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Safran Landing Systems SAS
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Publication date
Application filed by Safran Landing Systems SAS filed Critical Safran Landing Systems SAS
Publication of EP3611389A1 publication Critical patent/EP3611389A1/en
Application granted granted Critical
Publication of EP3611389B1 publication Critical patent/EP3611389B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • 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
    • F15B15/1428—Cylinders
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/87—Detection of failures

Definitions

  • the invention relates to a telescopic locking actuator and locking indicator.
  • Telescopic actuators for example hydraulic cylinders comprising a body in which a rod is slidably mounted along a sliding axis, and comprising a locking member for automatically locking the rod on the body when the rod arrives in one extreme positions.
  • the finger is mounted mobile on the body along a locking axis perpendicular to the sliding axis between a locking position towards which it is pushed back by a spring to penetrate a groove in the rod, and a position retracted in which it is pushed against the spring by the pressurized fluid admitted into the chamber of the jack into which the finger opens.
  • a sleeve is movably mounted on the body along the sliding axis between a retracted position in which it is pushed by the rod when the latter approaches the locking position, and a finger retaining position in the retracted position in which the sleeve is pushed by a spring to be placed under the finger which has been retracted by the pressurized fluid.
  • the invention aims to propose a linear actuator with finger locking, the indication member of which makes it possible to detect a non-locking even if the finger seems to be in the locking position.
  • a telescopic actuator comprising a body in which a rod is slidably mounted along a sliding axis, the actuator comprising a locking member comprising a locking finger movable in a locking direction. perpendicular to the sliding axis between a locking position in which one end of the locking finger is engaged in a groove of the rod to lock the rod in position, and a retracted position in which the end of the finger is released from the groove to release the rod, a locking indicator being mounted integral with the locking finger to be movable between a locking indicator position when the locking finger is in the locking position and an unlocking indicator position when the locking finger is in the position retracted.
  • the locking indicator is secured to the locking finger by a link which can be broken during cutting of the end of the finger while the rod is locked, a thrust spring being disposed in the finger to push the lock indicator to the unlock indicator position when said link is broken.
  • the locking indicator delivers reliable information even if the finger is broken, by appearing in the unlocking indicator position even when the end of the finger has been cut off and the locking finger remains in the unlocked position.
  • the indicator is associated with a fragile support which extends into a bore of the locking finger so as to be linked to the end of the latter.
  • the severing of the end leads to the rupture of the fragile support, and therefore the separation of the locking indicator, which can therefore be moved by the thrust spring.
  • a telescopic actuator in this case a hydraulic cylinder 1 comprising a hollow body 2 in which a rod 3 associated with a piston 4 is mounted to slide in sealed manner in the body 1 along a sliding axis X to define a full chamber 5 extending between the piston 4 and a solid bottom of the body (not visible here), and an annular chamber 6 extending between the piston 4 and a drilled bottom 7 through which the rod 3 protrudes.
  • the piston 4 has a groove 8 to receive the end 9 of a locking finger 10 mounted for leaktight sliding along a locking axis Y perpendicular to the sliding axis X in a housing 11 of the body 1 between a locking position illustrated in figure 1 in which the end 9 is engaged in the groove 8 to block the rod 3 in the extended position, and a retracted position illustrated in figures 2 and 3 in which the end 9 is released from the groove 8, thereby releasing the rod 3.
  • the locking finger 10 is returned to the locking position by a locking spring 12 resting on a plug 13 closing the housing 11.
  • the locking finger 10 is pushed into the retracted position when pressurized fluid is admitted into the annular chamber 6.
  • a sleeve 14 is placed in the body 1 to slide along the sliding axis X between a withdrawal position towards which it is pushed by the piston 4 against a return spring 15 when the rod 3 is in the locked position, as illustrated in the figure 1 , and a locking position illustrated in figure 3 wherein the sleeve 14 is pushed by the return spring 15 while the locking finger 10 is in the retracted position to hold it there and lock it in this position even when the annular chamber 6 is no longer under pressure.
  • the locking finger 10 is associated with a locking indicator 20 which, as visible on the figure 1 , protrudes from the plug 13 to be visible from the outside.
  • the locking indicator 20 is integral with a rod 26 engaged in a central bore 21 of the locking finger 10.
  • the rod 26 is extended by a fragile support 22 of reduced section which ends in a foot 23 which is secured to the locking finger 10 at the end 9 thereof by a rod 24.
  • a thrust spring 25 extends around the rod 26 in a housing 27 of the locking finger 10 while resting on a bottom of the housing 27 and a shoulder of the indicator 10 to push the indicator 20 outwards. In the situation illustrated here, the rod 24 retains the locking indicator 20 against the thrust spring 25.
  • the rod 3 can move in the body 2, which has the effect of allowing the sleeve 14 to move towards the locking position under the action of the return spring 15 to hold the locking finger 10 in position retracted, as illustrated in figure 3 .
  • the locking indicator 20 is thus kept in the unlocking indicator position.
  • the rod 3 returns to the extended position, until the sleeve 14 is pushed against the spring 15 and thus allows the end 9 of the locking finger 10 to enter the groove 8 under the action of the locking spring 12 to lock the rod 3.
  • the locking indicator 20 returns to the locking indicator position.
  • the load coupled to the rod can exert on the rod 3 a significant force while the rod 3 is in the locked position.
  • the force is so great that it causes the locking finger 10 to break by cutting off its end 9. The rod 3 is thus released, while the locking finger 10 remains in the locked position, as illustrated in figure 4 .
  • the rupture of the end 9 of the locking finger 10 simultaneously causes the rupture of the fragile support 21, so that the connection between the locking indicator 20 and the locking finger 10 is broken.
  • the locking indicator 20 thus released is pushed back to the unlocking indicator position by the pushing spring 25, even though the locking finger 10 remains in the locked position. This arrangement prevents the locking indicator from providing a locking indication when in practice, the rod 3 is released.
  • the locking indicator 20 is used to actuate a return 30 carrying a target 31 which moves opposite a detector 32 between a position close to the detector 32, as illustrated in FIG. figure 6 , which corresponds to the locking indicator position, and a position remote from the detector 32, as illustrated in figures 7 to 9 , which corresponds to the unlocking indicator position, so that the detector 32 generates an electrical signal taking two distinct values, which makes it possible to distinguish the two witness positions.
  • the reference 30 is articulated on a pivot 33 integral with the plug 13 and extending in an oblong opening 34 of the reference 30.
  • the reference 30 is also articulated on a collar 35 directly tightened on the external end of the locking indicator 20.

Abstract

Actionneur télescopique comportant un corps (2) dans lequel une tige (3) est montée à coulissement selon un axe de coulissement (X), l'actionneur comportant un organe de verrouillage comportant un doigt de verrouillage (10) mobile selon une direction de verrouillage (Y) perpendiculaire à l'axe de coulissement entre une position de verrouillage dans laquelle une extrémité (9) du doigt de verrouillage (10) est engagée dans une gorge (8) de la tige pour verrouiller la tige en position, et une position escamotée dans laquelle l'extrémité du doigt est dégagée de la gorge pour libérer la tige, un témoin de verrouillage (20) étant monté solidaire du doigt de verrouillage pour être mobile entre une position témoin de verrouillage quand le doigt de verrouillage est en position de verrouillage et une position témoin de déverrouillage lorsque le doigt de verrouillage est en position escamotée, caractérisé en ce que le témoin de verrouillage est solidarisé au doigt de verrouillage par une liaison (22,23,24) susceptible d'être brisée lors d'un sectionnement de l'extrémité du doigt alors que la tige est verrouillée, un ressort de poussée (25) étant disposé dans le doigt de verrouillage pour pousser le témoin de verrouillage vers la position témoin de déverrouillage lorsque ladite liaison est brisée.Telescopic actuator comprising a body (2) in which a rod (3) is slidably mounted along a sliding axis (X), the actuator comprising a locking member comprising a locking finger (10) movable in a locking direction (Y) perpendicular to the sliding axis between a locking position in which one end (9) of the locking finger (10) is engaged in a groove (8) of the rod to lock the rod in position, and a position retracted in which the end of the finger is released from the groove to release the rod, a locking indicator (20) being mounted integral with the locking finger to be movable between a locking indicator position when the locking finger is in the locking and an unlocking indicator position when the locking finger is in the retracted position, characterized in that the locking indicator is secured to the locking finger tooling by a link (22, 23, 24) capable of being broken during cutting of the end of the finger while the rod is locked, a pushing spring (25) being arranged in the locking finger to push the locking indicator to the unlocking indicator position when said link is broken.

Description

L'invention concerne un actionneur télescopique à verrouillage et témoin de verrouillage.The invention relates to a telescopic locking actuator and locking indicator.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

On connaît des actionneurs télescopiques, par exemple des vérins hydrauliques comportant un corps dans lequel une tige est montée à coulissement selon un axe de coulissement, et comportant un organe de verrouillage pour verrouiller automatiquement la tige sur le corps quand la tige arrive dans l'une des positions extrémales.Telescopic actuators are known, for example hydraulic cylinders comprising a body in which a rod is slidably mounted along a sliding axis, and comprising a locking member for automatically locking the rod on the body when the rod arrives in one extreme positions.

Divers types d'organes de verrouillage existent, parmi lesquels les verrouillages à griffes, à segments, ou encore à doigt. Pour ce dernier type, le doigt est monté mobile sur le corps selon un axe de verrouillage perpendiculaire à l'axe de coulissement entre une position de verrouillage vers laquelle il est repoussé par un ressort pour pénétrer dans une gorge de la tige, et une position escamotée dans laquelle il est poussé à l'encontre du ressort par le fluide sous pression admis dans la chambre du vérin dans laquelle débouche le doigt. Un manchon est monté mobile sur le corps selon l'axe de coulissement entre une position escamotée dans laquelle il est poussé par la tige lorsque celle-ci approche de la position de verrouillage, et une position de retenue du doigt en position escamotée dans laquelle le manchon est poussé par un ressort pour se placer sous le doigt qui a été escamoté par le fluide sous pression.Various types of locking devices exist, including claw, segment and finger locks. For the latter type, the finger is mounted mobile on the body along a locking axis perpendicular to the sliding axis between a locking position towards which it is pushed back by a spring to penetrate a groove in the rod, and a position retracted in which it is pushed against the spring by the pressurized fluid admitted into the chamber of the jack into which the finger opens. A sleeve is movably mounted on the body along the sliding axis between a retracted position in which it is pushed by the rod when the latter approaches the locking position, and a finger retaining position in the retracted position in which the sleeve is pushed by a spring to be placed under the finger which has been retracted by the pressurized fluid.

Il est connu d'équiper le doigt d'un témoin ou de tout dispositif de détection pour vérifier dans quelle position se trouve le doigt, et ainsi indiquer si la tige est verrouillée ou déverrouillée. Cependant, alors que la tige est verrouillée, il peut arriver que la tige du vérin subisse un effort tel que l'extrémité du doigt soit sectionnée. La tige apparaîtra alors verrouillée alors que le doigt sectionné ne peut retenir la tige en position.It is known to equip the finger with a telltale or any detection device to check in which position the finger is, and thus indicate whether the rod is locked or unlocked. However, while the rod is locked, it may happen that the cylinder rod undergoes a force such that the end of the finger is cut. The rod will then appear locked while the severed finger cannot hold the rod in position.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention vise à proposer un actionneur linéaire à verrouillage à doigt, dont l'organe d'indication permette de détecter un non-verrouillage même si le doigt semble en position de verrouillage.The invention aims to propose a linear actuator with finger locking, the indication member of which makes it possible to detect a non-locking even if the finger seems to be in the locking position.

PRESENTATION DE L'INVENTIONPRESENTATION OF THE INVENTION

En vue de la réalisation de ce but, on propose un Actionneur télescopique comportant un corps dans lequel une tige est monté à coulissement selon un axe de coulissement, l'actionneur comportant un organe de verrouillage comportant un doigt de verrouillage mobile selon une direction de verrouillage perpendiculaire à l'axe de coulissement entre une position de verrouillage dans laquelle une extrémité du doigt de verrouillage est engagée dans une gorge de la tige pour verrouiller la tige en position, et une position escamotée dans laquelle l'extrémité du doigt est dégagée de la gorge pour libérer la tige, un témoin de verrouillage étant monté solidaire du doigt de verrouillage pour être mobile entre une position témoin de verrouillage quand le doigt de verrouillage est en position de verrouillage et une position témoin de déverrouillage lorsque le doigt de verrouillage est en position escamotée. Selon l'invention, le témoin de verrouillage est solidarisé au doigt de verrouillage par une liaison susceptible d'être brisée lors d'un sectionnement de l'extrémité du doigt alors que la tige est verrouillée, un ressort de poussée étant disposé dans le doigt de verrouillage pour pousser le témoin de verrouillage vers la position témoin de déverrouillage lorsque ladite liaison est brisée.With a view to achieving this goal, a telescopic actuator is provided comprising a body in which a rod is slidably mounted along a sliding axis, the actuator comprising a locking member comprising a locking finger movable in a locking direction. perpendicular to the sliding axis between a locking position in which one end of the locking finger is engaged in a groove of the rod to lock the rod in position, and a retracted position in which the end of the finger is released from the groove to release the rod, a locking indicator being mounted integral with the locking finger to be movable between a locking indicator position when the locking finger is in the locking position and an unlocking indicator position when the locking finger is in the position retracted. According to the invention, the locking indicator is secured to the locking finger by a link which can be broken during cutting of the end of the finger while the rod is locked, a thrust spring being disposed in the finger to push the lock indicator to the unlock indicator position when said link is broken.

Ainsi, le témoin verrouillage délivre une information fiable même si le doigt est brisé, en apparaissant en position témoin de déverrouillage alors même que l'extrémité du doigt a été sectionnée et que le doigt de verrouillage reste en position de déverrouillage.Thus, the locking indicator delivers reliable information even if the finger is broken, by appearing in the unlocking indicator position even when the end of the finger has been cut off and the locking finger remains in the unlocked position.

Selon un mode préféré de réalisation de l'invention, le témoin est associé à un support fragile qui s'étend dans un alésage du doigt de verrouillage pour être lié à l'extrémité de celui-ci. Ainsi, le sectionnement de l'extrémité entraîne la rupture du support fragile, et donc la désolidarisation du témoin de verrouillage, qui peut dès lors être déplacé par le ressort de poussée.According to a preferred embodiment of the invention, the indicator is associated with a fragile support which extends into a bore of the locking finger so as to be linked to the end of the latter. Thus, the severing of the end leads to the rupture of the fragile support, and therefore the separation of the locking indicator, which can therefore be moved by the thrust spring.

DESCRIPTION DES FIGURESDESCRIPTION OF THE FIGURES

L'invention sera mieux comprise à la lumière de la description qui suit d'un mode particulier de réalisation de l'invention, en référence aux figures des dessins annexés, parmi lesquelles :

  • la figure 1 est une vue en coupe d'un actionneur télescopique à verrouillage selon un mode particulier de réalisation de l'invention, la tige de l'actionneur étant illustrée en position verrouillée et le doigt de verrouillage en position de verrouillage et le témoin étant en position témoin de verrouillage ;
  • la figure 2 est une vue analogue à celle de la figure 1, la tige étant en cours de déverrouillage, le doigt étant repoussé en position escamotée et le témoin étant en position témoin de déverrouillage ;
  • la figure 3 est une vue analogue à celle de la figure 2, la tige ayant été déverrouillée et le doigt bloqué en position escamotée, le témoin étant en position témoin de déverrouillage ;
  • la figure 4 est une vue analogue à celle de la figure 1, le doigt étant en position de verrouillage mais l'extrémité du doigt de verrouillage ayant été brisé par la tige et le témoin ayant été repoussé en position témoin de déverrouillage ;
  • la figure 5 est une vue agrandie de détail de la liaison entre le témoin de verrouillage et le doigt de verrouillage ;
  • Les figures 6 à 9 sont des figures similaires aux figures 1 à 4 d'une variante de réalisation de l'invention.
The invention will be better understood in the light of the following description of a particular embodiment of the invention, with reference to the figures of the appended drawings, among which:
  • the figure 1 is a sectional view of a telescopic locking actuator according to a particular embodiment of the invention, the actuator rod being illustrated in the locked position and the locking finger in the locking position and the indicator being in the witness position locking;
  • the figure 2 is a view similar to that of the figure 1 , the rod being unlocked, the finger being pushed back into the retracted position and the indicator being in the unlocking indicator position;
  • the figure 3 is a view similar to that of the figure 2 , the rod having been unlocked and the finger locked in the retracted position, the indicator being in the unlocking indicator position;
  • the figure 4 is a view similar to that of the figure 1 , the finger being in the locking position but the end of the locking finger having been broken by the rod and the indicator having been pushed back into the unlocking indicator position;
  • the figure 5 is an enlarged detail view of the connection between the locking indicator and the locking finger;
  • The figures 6 to 9 are figures similar to figures 1 to 4 of an alternative embodiment of the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence aux figures 1 à 4, l'invention s'applique à un actionneur télescopique, en l'occurrence ici un vérin hydraulique 1 comportant un corps creux 2 dans lequel une tige 3 associée à un piston 4 est montée à coulissement étanche dans le corps 1 selon un axe de coulissement X pour définir une chambre pleine 5 s'étendant entre le piston 4 et un fond plein du corps (non visible ici), et une chambre annulaire 6 s'étendant entre le piston 4 et un fond percé 7 par lequel saille la tige 3.With reference to figures 1 to 4 , the invention applies to a telescopic actuator, in this case a hydraulic cylinder 1 comprising a hollow body 2 in which a rod 3 associated with a piston 4 is mounted to slide in sealed manner in the body 1 along a sliding axis X to define a full chamber 5 extending between the piston 4 and a solid bottom of the body (not visible here), and an annular chamber 6 extending between the piston 4 and a drilled bottom 7 through which the rod 3 protrudes.

Le piston 4 comporte une gorge 8 pour recevoir l'extrémité 9 d'un doigt de verrouillage 10 monté à coulissement étanche selon un axe de verrouillage Y perpendiculaire à l'axe de coulissement X dans un logement 11 du corps 1 entre une position de verrouillage illustrée à la figure 1 dans laquelle l'extrémité 9 est engagée dans la gorge 8 pour bloquer la tige 3 en position sortie, et une position escamotée illustré aux figures 2 et 3 dans laquelle l'extrémité 9 est dégagée de la gorge 8, libérant ainsi la tige 3.The piston 4 has a groove 8 to receive the end 9 of a locking finger 10 mounted for leaktight sliding along a locking axis Y perpendicular to the sliding axis X in a housing 11 of the body 1 between a locking position illustrated in figure 1 in which the end 9 is engaged in the groove 8 to block the rod 3 in the extended position, and a retracted position illustrated in figures 2 and 3 in which the end 9 is released from the groove 8, thereby releasing the rod 3.

Le doigt de verrouillage 10 est rappelé vers la position de verrouillage par un ressort de verrouillage 12 s'appuyant sur un bouchon 13 fermant le logement 11. Le doigt de verrouillage 10 est poussé en position escamotée lorsque du fluide sous pression est admis dans la chambre annulaire 6. Un manchon 14 est disposé dans le corps 1 pour coulisser selon l'axe de coulissement X entre une position de retrait vers laquelle il est poussé par le piston 4 à l'encontre d'un ressort de rappel 15 lorsque la tige 3 est en position verrouillée, comme illustré à la figure 1, et une position de blocage illustrée à la figure 3 dans laquelle le manchon 14 est poussé par le ressort de rappel 15 alors que le doigt de verrouillage 10 est en position escamotée pour l'y maintenir et le bloquer dans cette position alors même que la chambre annulaire 6 ne serait plus sous pression.The locking finger 10 is returned to the locking position by a locking spring 12 resting on a plug 13 closing the housing 11. The locking finger 10 is pushed into the retracted position when pressurized fluid is admitted into the annular chamber 6. A sleeve 14 is placed in the body 1 to slide along the sliding axis X between a withdrawal position towards which it is pushed by the piston 4 against a return spring 15 when the rod 3 is in the locked position, as illustrated in the figure 1 , and a locking position illustrated in figure 3 wherein the sleeve 14 is pushed by the return spring 15 while the locking finger 10 is in the retracted position to hold it there and lock it in this position even when the annular chamber 6 is no longer under pressure.

Le doigt de verrouillage 10 est associé à un témoin de verrouillage 20 qui, comme visible à la figure 1, dépasse du bouchon 13 pour être visible de l'extérieur. Le témoin de verrouillage 20 est solidaire d'une tige 26 engagée dans un alésage central 21 du doigt de verrouillage 10. Comme cela est plus particulièrement visible à la figure 5, la tige 26 se prolonge par un support fragile 22 de section diminuée qui se termine par un pied 23 qui est solidarisé au doigt de verrouillage 10 au niveau de l'extrémité 9 de celui-ci par un jonc 24. Un ressort de poussée 25 s'étend autour de la tige 26 dans un logement 27 du doigt de verrouillage 10 en prenant appui sur un fond du logement 27 et un épaulement du témoin 10 pour pousser le témoin 20 vers l'extérieur. Dans la situation illustrée ici, le jonc 24 retient le témoin de verrouillage 20 à l'encontre du ressort de poussée 25.The locking finger 10 is associated with a locking indicator 20 which, as visible on the figure 1 , protrudes from the plug 13 to be visible from the outside. The locking indicator 20 is integral with a rod 26 engaged in a central bore 21 of the locking finger 10. As is more particularly visible on the figure 5 , the rod 26 is extended by a fragile support 22 of reduced section which ends in a foot 23 which is secured to the locking finger 10 at the end 9 thereof by a rod 24. A thrust spring 25 extends around the rod 26 in a housing 27 of the locking finger 10 while resting on a bottom of the housing 27 and a shoulder of the indicator 10 to push the indicator 20 outwards. In the situation illustrated here, the rod 24 retains the locking indicator 20 against the thrust spring 25.

Le fonctionnement de l'ensemble est maintenant détaillé. Dans la situation illustrée à la figure 1, l'extrémité 9 du doigt de verrouillage 10 est engagée dans la gorge 8 du piston 4, ce qui verrouille la tige 3 en position (ici en position sortie). Le ressort de verrouillage 12 maintient le doigt de verrouillage en position de verrouillage. Le témoin de verrouillage 20 est en position témoin de verrouillage.The operation of the assembly is now detailed. In the situation illustrated in figure 1 , the end 9 of the locking finger 10 is engaged in the groove 8 of the piston 4, which locks the rod 3 in position (here in the extended position). The locking spring 12 maintains the locking finger in the locking position. The locking indicator 20 is in the locking indicator position.

L'admission de fluide sous pression dans la chambre annulaire 6 provoque le déplacement du doigt de verrouillage 10 vers sa position escamotée, comme illustré à la figure 2, libérant ainsi la tige 3. Le témoin de verrouillage 20 est alors en position témoin de déverrouillage.The admission of pressurized fluid into the annular chamber 6 causes the locking finger 10 to move towards its retracted position, as illustrated in the figure 2 , thus releasing the rod 3. The locking indicator 20 is then in the unlocking indicator position.

Ainsi libérée, la tige 3 peut se déplacer dans le corps 2, ce qui a pour effet de permettre au manchon 14 de se déplacer vers la position de blocage sous l'action du ressort de rappel 15 pour maintenir le doigt de verrouillage 10 en position escamotée, comme illustré à la figure 3. Le témoin de verrouillage 20 est ainsi maintenu en position témoin de déverrouillage.Thus released, the rod 3 can move in the body 2, which has the effect of allowing the sleeve 14 to move towards the locking position under the action of the return spring 15 to hold the locking finger 10 in position retracted, as illustrated in figure 3 . The locking indicator 20 is thus kept in the unlocking indicator position.

Puis lorsque du fluide sous pression est admis dans la chambre pleine 5, la tige 3 revient vers la position sortie, jusqu'à repousser le manchon 14 à l'encontre du ressort 15 et permettre ainsi à l'extrémité 9 du doigt de verrouillage 10 de pénétrer dans la gorge 8 sous l'action du ressort de verrouillage 12 pour verrouiller la tige 3. Le témoin de verrouillage 20 revient en position témoin de verrouillage.Then when pressurized fluid is admitted into the full chamber 5, the rod 3 returns to the extended position, until the sleeve 14 is pushed against the spring 15 and thus allows the end 9 of the locking finger 10 to enter the groove 8 under the action of the locking spring 12 to lock the rod 3. The locking indicator 20 returns to the locking indicator position.

Dans certains cas, la charge attelée à la tige peut exercer sur la tige 3 un effort important alors que la tige 3 est en position verrouillée. Dans certaines circonstances exceptionnelles, l'effort est tellement important qu'il provoque la rupture du doigt de verrouillage 10 par sectionnement de son extrémité 9. La tige 3 est ainsi libérée, alors que le doigt de verrouillage 10 reste dans la position verrouillée, comme illustré à la figure 4.In some cases, the load coupled to the rod can exert on the rod 3 a significant force while the rod 3 is in the locked position. In certain exceptional circumstances, the force is so great that it causes the locking finger 10 to break by cutting off its end 9. The rod 3 is thus released, while the locking finger 10 remains in the locked position, as illustrated in figure 4 .

Cependant, la rupture de l'extrémité 9 du doigt de verrouillage 10 provoque simultanément la rupture du support fragile 21, de sorte que la liaison entre le témoin de verrouillage 20 et le doigt de verrouillage 10 est brisée. Le témoin de verrouillage 20 ainsi libéré est repoussé vers la position témoin de déverrouillage par le ressort de poussée 25, alors même que le doigt de verrouillage 10 reste en position verrouillée. Cette disposition permet d'éviter que le témoin de verrouillage ne fournisse une indication de verrouillage alors qu'en pratique, la tige 3 est bien libérée.However, the rupture of the end 9 of the locking finger 10 simultaneously causes the rupture of the fragile support 21, so that the connection between the locking indicator 20 and the locking finger 10 is broken. The locking indicator 20 thus released is pushed back to the unlocking indicator position by the pushing spring 25, even though the locking finger 10 remains in the locked position. This arrangement prevents the locking indicator from providing a locking indication when in practice, the rod 3 is released.

Plutôt qu'une indication visuelle, il peut être intéressant de détecter les positions du témoin de verrouillage au moyen d'un détecteur adapté à générer un signal électrique prenant deux valeurs distinctes. Selon une variante de l'invention illustrée aux figures 6 à 9, sur lequel les éléments communs portent la même référence que sur les figures 1 à 4, on utilise le témoin de verrouillage 20 pour actionner un renvoi 30 porteur d'une cible 31 qui se déplace en regard d'un détecteur 32 entre une position proche du détecteur 32, comme illustrée à la figure 6, qui correspond à la position témoin de verrouillage, et une position éloignée du détecteur 32, comme illustrée aux figures 7 à 9, qui correspond à la position témoin de déverrouillage, de sorte que le détecteur 32 génère un signal électrique prenant deux valeurs distinctes, ce qui permet de distinguer les deux positions témoins. Ici, le renvoi 30 est articulé sur un pivot 33 solidaire du bouchon 13 et s'étendant dans une ouverture 34 oblongue du renvoi 30. Le renvoi 30 est par ailleurs articulé sur un collier 35 directement serré sur l'extrémité externe du témoin de verrouillage 20. Ainsi, le déplacement du témoin de verrouillage 20 entraîne le pivotement du renvoi 30, et partant, le déplacement de la cible 31 entre ses deux positions proche et éloignée du détecteur 32.Rather than a visual indication, it may be advantageous to detect the positions of the locking indicator by means of a detector adapted to generate an electrical signal taking two distinct values. According to a variant of the invention illustrated in figures 6 to 9 , on which the common elements bear the same reference as on the figures 1 to 4 , the locking indicator 20 is used to actuate a return 30 carrying a target 31 which moves opposite a detector 32 between a position close to the detector 32, as illustrated in FIG. figure 6 , which corresponds to the locking indicator position, and a position remote from the detector 32, as illustrated in figures 7 to 9 , which corresponds to the unlocking indicator position, so that the detector 32 generates an electrical signal taking two distinct values, which makes it possible to distinguish the two witness positions. Here, the reference 30 is articulated on a pivot 33 integral with the plug 13 and extending in an oblong opening 34 of the reference 30. The reference 30 is also articulated on a collar 35 directly tightened on the external end of the locking indicator 20. Thus, the movement of the locking indicator 20 causes the gearbox 30 to pivot, and hence the movement of the target 31 between its two positions close and distant from the detector 32.

L'invention n'est pas limitée à ce qui vient d'être décrit, mais englobe au contraire toute variante entrant dans le cadre défini par les revendications.The invention is not limited to what has just been described, but on the contrary covers any variant coming within the scope defined by the claims.

Claims (4)

Actionneur télescopique comportant un corps (2) dans lequel une tige (3) est montée à coulissement selon un axe de coulissement (X), l'actionneur comportant un organe de verrouillage comportant un doigt de verrouillage (10) mobile selon une direction de verrouillage (Y) perpendiculaire à l'axe de coulissement entre une position de verrouillage dans laquelle une extrémité (9) du doigt de verrouillage (10) est engagée dans une gorge (8) de la tige pour verrouiller la tige en position, et une position escamotée dans laquelle l'extrémité du doigt est dégagée de la gorge pour libérer la tige, un témoin de verrouillage (20) étant monté solidaire du doigt de verrouillage pour être mobile entre une position témoin de verrouillage quand le doigt de verrouillage est en position de verrouillage et une position témoin de déverrouillage lorsque le doigt de verrouillage est en position escamotée, caractérisé en ce que le témoin de verrouillage est solidarisé au doigt de verrouillage par une liaison (22,23,24) susceptible d'être brisée lors d'un sectionnement de l'extrémité du doigt alors que la tige est verrouillée, un ressort de poussée (25) étant disposé dans le doigt de verrouillage pour pousser le témoin de verrouillage vers la position témoin de déverrouillage lorsque ladite liaison est brisée, le doigt de verrouillage restant alors en position de verrouillage.Telescopic actuator comprising a body (2) in which a rod (3) is slidably mounted along a sliding axis (X), the actuator comprising a locking member comprising a locking finger (10) movable in a locking direction (Y) perpendicular to the sliding axis between a locking position in which one end (9) of the locking finger (10) is engaged in a groove (8) of the rod to lock the rod in position, and a position retracted in which the end of the finger is released from the groove to release the rod, a locking indicator (20) being mounted integral with the locking finger to be movable between a locking indicator position when the locking finger is in the locking and an unlocking indicator position when the locking finger is in the retracted position, characterized in that the locking indicator is secured to the locking finger tooling by a link (22,23,24) capable of being broken during cutting of the end of the finger while the rod is locked, a pushing spring (25) being disposed in the locking finger to push the locking indicator to the unlocking indicator position when said link is broken, the locking finger then remaining in the locking position. Actionneur selon la revendication 1, dans lequel le témoin de verrouillage est engagé dans un alésage (21) du doigt de verrouillage (9) et est solidaire d'un support fragile (22) terminé par un pied (23) qui est lié à l'extrémité du doigt de verrouillage par un jonc (24).Actuator according to claim 1, in which the locking indicator is engaged in a bore (21) of the locking finger (9) and is integral with a fragile support (22) terminated by a foot (23) which is linked to the end of the locking finger by a ring (24). Actionneur selon la revendication 1, équipé d'un détecteur (32) pour générer un signal prenant deux valeurs selon qu'une cible (31) reliée au témoin de verrouillage est proche ou éloignée du détecteur.Actuator according to claim 1, equipped with a detector (32) for generating a signal taking two values depending on whether a target (31) connected to the locking indicator is near or far from the detector. Actionneur selon la revendication 3, dans lequel la cible est portée par un renvoi (30) articulé sur le corps de l'actionneur et relié au témoin de verrouillage.Actuator according to claim 3, in which the target is carried by a return (30) articulated on the body of the actuator and connected to the locking indicator.
EP19190472.1A 2018-08-17 2019-08-07 Linear actuator with locking and tamper-proof locking device Active EP3611389B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1857529A FR3085061B1 (en) 2018-08-17 2018-08-17 LINEAR ACTUATOR WITH LOCKING AND LOCKING INDICATOR

Publications (2)

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EP3611389A1 true EP3611389A1 (en) 2020-02-19
EP3611389B1 EP3611389B1 (en) 2021-07-07

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EP19190472.1A Active EP3611389B1 (en) 2018-08-17 2019-08-07 Linear actuator with locking and tamper-proof locking device

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US (1) US10830260B2 (en)
EP (1) EP3611389B1 (en)
CN (1) CN110836211B (en)
ES (1) ES2887702T3 (en)
FR (1) FR3085061B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702024A (en) * 1950-07-24 1955-02-15 Electro Hydraulics Ltd Automatic mechanical locking device for telescopic jacks
US4887944A (en) * 1980-01-29 1989-12-19 Lucas Industries Public Limited Company Fuel injection pump including plunger setting device
CN2758546Y (en) * 2004-12-28 2006-02-15 烟台兴德气动机械有限公司 Mechanical locking hydraulic cylinder
EP2300319A2 (en) * 2008-06-13 2011-03-30 Airbus Operations Jack device for aircraft landing gear system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359862A (en) * 1966-02-25 1967-12-26 Mcdowell Wellman Eng Co Piston locking means
CN203035637U (en) * 2012-11-26 2013-07-03 无锡恒立威士气动技术有限公司 Locking air cylinder for upper cover of railway tramcar boxcar
US9291176B2 (en) * 2013-01-30 2016-03-22 Messier-Dowty Inc. Locking mechanism for locking an actuator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702024A (en) * 1950-07-24 1955-02-15 Electro Hydraulics Ltd Automatic mechanical locking device for telescopic jacks
US4887944A (en) * 1980-01-29 1989-12-19 Lucas Industries Public Limited Company Fuel injection pump including plunger setting device
CN2758546Y (en) * 2004-12-28 2006-02-15 烟台兴德气动机械有限公司 Mechanical locking hydraulic cylinder
EP2300319A2 (en) * 2008-06-13 2011-03-30 Airbus Operations Jack device for aircraft landing gear system

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CN110836211A (en) 2020-02-25
EP3611389B1 (en) 2021-07-07
CN110836211B (en) 2021-07-27
US20200056637A1 (en) 2020-02-20
ES2887702T3 (en) 2021-12-27
US10830260B2 (en) 2020-11-10
FR3085061B1 (en) 2021-01-22
FR3085061A1 (en) 2020-02-21

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