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EP0097751A1 - Air cylinder with speed control - Google Patents

Air cylinder with speed control Download PDF

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Publication number
EP0097751A1
EP0097751A1 EP82401722A EP82401722A EP0097751A1 EP 0097751 A1 EP0097751 A1 EP 0097751A1 EP 82401722 A EP82401722 A EP 82401722A EP 82401722 A EP82401722 A EP 82401722A EP 0097751 A1 EP0097751 A1 EP 0097751A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
conduit
bore
needle
interior
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.)
Withdrawn
Application number
EP82401722A
Other languages
German (de)
French (fr)
Inventor
Robert Andrieu
Gérard Canu
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.)
Compagnie Parisienne dOutillage a Air Comprime SA
Original Assignee
PARISIENNE OUTILLAGE
Compagnie Parisienne dOutillage a Air Comprime SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PARISIENNE OUTILLAGE, Compagnie Parisienne dOutillage a Air Comprime SA filed Critical PARISIENNE OUTILLAGE
Publication of EP0097751A1 publication Critical patent/EP0097751A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position

Definitions

  • the present invention relates to a pneumatic cylinder whose displacement speed of the rod can be adjustable.
  • An object of the present invention is to provide a pneumatic cylinder whose stroke speed can be adjustable and which does not have the drawbacks mentioned above.
  • the invention relates to a pneumatic cylinder with adjustable operating speed comprising a cylinder, a piston, two end bottoms and in each bottom a bore for the supply and the exhaust, characterized in that at least the one of said bores communicates with the interior of the cylinder by a conduit partially closable by a needle.
  • the needle is screwed into a threaded hole in the bottom.
  • the conduit comprises a first portion in the extension of the bore communicating with the interior of the cylinder and a second portion substantially at right angles opening into the bore.
  • the conduit communicates with the interior of the cylinder by opening into a damping chamber formed in the bottom of the cylinder, said chamber cooperating with a dash-pot.
  • the jack comprises a needle partially closing a conduit formed in the bottom and connecting the internal face of the bottom with the interior of the damping chamber.
  • the piston represented in the figures comprises a cylinder 1 two bottoms 2 and 3 secured to the bottoms by tie rods, 4, 5, 6 and 7. Inside the cylinder slides a piston 8 displacing a rod 9 of which one end 10 crosses the background 2.
  • the invention is described with reference to a jack whose rod comes out only on one side, but it applies of course to a jack whose rod emerges at each end of the jack.
  • Each bottom has a bore intended to be connected to a supply line of air or compressed gas, and thus serving for the exhaust; these bores 21, 22 in conventional cylinders, respectively open into cylindrical chambers 31, 32 formed in the bottoms and into which dash pots 41, 42 can engage for the damping of the mobile equipment. As will be seen later, according to the present invention, the bores 21 and 22 do not communicate directly with the chambers.
  • Each bottom is fitted with a make-up valve.
  • valve with ball (51, 61) and spring (52, 62) allows thanks to the conduits 53, 63 (towards the cylinder) and the conduits 54, 64 (towards the chambers 31, 32) to put the pressure on the piston on one side and avoid exhaust on the other, and vice versa.
  • References 55 and 65 designate plugs for closing the valve bores.
  • one of the bottoms of the jack is provided a device for adjusting the speed of movement of the piston when the latter moves in the direction which brings it closer to said bottom. It is here the bottom 2 which is provided with such a device, making it possible to adjust the speed of the piston when the latter moves from right to left by looking at the figures.
  • each of the two bottoms is provided with the same device if it is desired to adjust the speed of the piston for its two directions of movement;
  • the speed adjusting device associated with the bottom 1 comprises a needle 70 whose end 71 opens into a conduit 75A - 75B connecting the supply-exhaust bore 21 to the internal chamber 31 of the jack .
  • the conduit 75A - 75B consists of two bores substantially at right angles, one 75A in the extension of the bore 72, the other 75B opening on one side of the bottom 2.
  • the end 71 of the needle 70 more or less closes the conduit 75A, and creates a pressure drop which limits the speed of escape of the air or gas and consequently, the speed of the movable member of the jack.
  • This pressure drop is adjustable by pressing the needle more or less large, which is screwed into a threaded bore 72 and opens outside the bottom 2 on one of its sides.
  • a seal 73 and a needle stop plate 74 complete the device. It is found that the adjustment device is simple and makes it possible to adjust the speed of the piston by simple rotation of the head of the needle accessible from the outside. No member protrudes from the bottom of the jack, which allows a very significant saving of space, in particular allowing the stacking of several jacks.
  • This system comprises a conduit 80 pierced in the bottom 2 parallel to the axis of the piston and opens into a bore 81 partially closed by a needle 82 accessible on one of the sides of the bottom.
  • the conduit 80 is extended by a conduit 84 which opens into the interior of the chamber 31.
  • the air path is represented by arrows.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A pneumatic jack with adjustable operating speed comprises a cylinder, a piston, two end covers and, in each cover, a bore for supply and discharge. At least one of the said bores (21) communicates with the inside of the cylinder via a duct (75A, 75B) which can be partially closed off by a needle (70). <IMAGE>

Description

La présente invention concerne un vérin pneumatique dont la vitesse de déplacement de la tige peut être réglable.The present invention relates to a pneumatic cylinder whose displacement speed of the rod can be adjustable.

Jusqu'à ce jour, pour régler la vitesse de déplacement d'un vérin, on associe à ce dernier un étrangleur réglable.To date, to adjust the speed of movement of a jack, we associate with it an adjustable choke.

Cette association nécessite de prévoir une bride de fixation de l'étrangleur sur le vérin, ce qui augmente le prix du vérin ; monté en superstructure sur le vérin, l'étrangleur occupe un certain volume qui vient augmenter le volume total de l'installation, ce qui peut être un inconvénient lorsque la place disponible est limitée.This association requires providing a clamp for fixing the choke on the jack, which increases the price of the jack; mounted in superstructure on the cylinder, the choke occupies a certain volume which increases the total volume of the installation, which can be a drawback when the space available is limited.

Enfin le prix du vérin est grevé par le coût supplémentaire dû au montage.Finally the price of the cylinder is burdened by the additional cost due to assembly.

Un but de la présente invention est de réaliser un vérin pneumatique dont la vitesse de course peut être réglable et qui ne présente pas les inconvénients énoncés ci-dessus.An object of the present invention is to provide a pneumatic cylinder whose stroke speed can be adjustable and which does not have the drawbacks mentioned above.

L'invention a pour objet un vérin pneumatique à vitesse de fonctionnement réglable comprenant un cylindre, un piston, deux fonds d'extrémité et dans chaque fond un alésage pour l'alimentation et l'échappement, caractérisé en ce qu'au moins l'un desdits alésages communique avec l'intérieur du cylindre par un conduit partiellement obturable par un pointeau.The invention relates to a pneumatic cylinder with adjustable operating speed comprising a cylinder, a piston, two end bottoms and in each bottom a bore for the supply and the exhaust, characterized in that at least the one of said bores communicates with the interior of the cylinder by a conduit partially closable by a needle.

Pour permettre le réglage recherché, le pointeau est vissé dans un alésage taraudé du fond.To allow the desired adjustment, the needle is screwed into a threaded hole in the bottom.

Avantageusement, le conduit comprend une première portion dans le prolongement de l'alésage communiquant avec l'intérieur du cylindre et une seconde portion sensiblement à angle droit débouchant dans l'alésage.Advantageously, the conduit comprises a first portion in the extension of the bore communicating with the interior of the cylinder and a second portion substantially at right angles opening into the bore.

Dans les vérins à fin de course amortie, le conduit communique avec l'intérieur du cylindre en débouchant dans une chambre d'amortissement pratiquée dans le fond du cylindre, ladite chambre coopérant avec un dash-pot.In cylinders with damped end-of-travel, the conduit communicates with the interior of the cylinder by opening into a damping chamber formed in the bottom of the cylinder, said chamber cooperating with a dash-pot.

Le vérin comporte un pointeau obturant partiellement un conduit pratiqué dans le fond et reliant la face interne du fond avec l'intérieur de la chambre d'amortissement.The jack comprises a needle partially closing a conduit formed in the bottom and connecting the internal face of the bottom with the interior of the damping chamber.

L'invention sera bien comprise par la description ci-après d'un mode préféré de réalisation, en référence au dessin annexé dans lequel :

  • - la figure 1 est une vue en élévation d'un vérin selon l'invention en coupe partielle selon la ligne brisée 1-1 de la figure 2.
  • - la figure 2 est une vue en coupe selon la ligne II-II de la figure 1.
  • - la figure 3 est une vue en élévation du même vérin.
  • - la figure 4 est une vue en coupe selon la ligne brisée IV-IV de la figure 3.
  • - la figure 5 est une vue en élévation partiellement arrachée et coupée selon la ligne V-V de la figure 6, le piston étant représenté dans la phase d'amortissement.
  • - la figure 6 est une vue en coupe selon la ligne VI-VI de la figure 5.,
The invention will be better understood from the following description of a preferred embodiment, with reference to the accompanying drawing in which:
  • FIG. 1 is an elevation view of a jack according to the invention in partial section along the broken line 1-1 of FIG. 2.
  • - Figure 2 is a sectional view along line II-II of Figure 1.
  • - Figure 3 is an elevational view of the same cylinder.
  • - Figure 4 is a sectional view along the broken line IV-IV of Figure 3.
  • - Figure 5 is an elevational view partially cut away and cut along the line VV of Figure 6, the piston being shown in the damping phase.
  • FIG. 6 is a sectional view along line VI-VI of FIG. 5.,

Le piston représenté dans les figures comprend un cylindre 1 deux fonds 2 et 3 solidarisés aux fonds par des tirants, 4, 5, 6 et 7. A l'intérieur du cylindre coulisse un piston 8 déplaçant une tige 9 dont une extrémité 10 traverse le fond 2.The piston represented in the figures comprises a cylinder 1 two bottoms 2 and 3 secured to the bottoms by tie rods, 4, 5, 6 and 7. Inside the cylinder slides a piston 8 displacing a rod 9 of which one end 10 crosses the background 2.

L'invention est décrite en référence à un vérin dont la tige ne sort que d'un côté, mais elle s'applique bien entendu à un vérin dont la tige émerge à chaque extrémité du vérin.The invention is described with reference to a jack whose rod comes out only on one side, but it applies of course to a jack whose rod emerges at each end of the jack.

Chaque fond possède un alésage destiné à être relié à une canalisation d'alimentation en air ou gaz comprimé, et servant ainsi à l'échappement ; ces alésages 21, 22 dans les vérins classiques, débouchent respectivement dans des chambres cylindriques 31, 32 pratiquées dans les fonds et dans lesquelles peuvent s'engager des dash- pots 41, 42 pour l'amortissement de l'équipage mobile. Comme on le verra plus loin, selon la présente invention, les alésages 21 et 22 ne communiquent pas directement avec les chambres.Each bottom has a bore intended to be connected to a supply line of air or compressed gas, and thus serving for the exhaust; these bores 21, 22 in conventional cylinders, respectively open into cylindrical chambers 31, 32 formed in the bottoms and into which dash pots 41, 42 can engage for the damping of the mobile equipment. As will be seen later, according to the present invention, the bores 21 and 22 do not communicate directly with the chambers.

Chaque fond est muni d'un clapet de réalimentation.Each bottom is fitted with a make-up valve.

Le clapet, à bille (51, 61) et ressort (52, 62) permet grâce aux conduits 53, 63 (vers le cylindre) et aux conduits 54, 64 (vers les chambres 31, 32) de mettre la pression sur le piston d'un côté et d'éviter l'échappement de l'autre, et vice-versa. Les références 55 et 65 désignent des pions d'obturation des alésages des clapets.The valve, with ball (51, 61) and spring (52, 62) allows thanks to the conduits 53, 63 (towards the cylinder) and the conduits 54, 64 (towards the chambers 31, 32) to put the pressure on the piston on one side and avoid exhaust on the other, and vice versa. References 55 and 65 designate plugs for closing the valve bores.

Conformément à l'invention, l'un des fonds du vérin est muni d'un dispositif permettant de régler la vitesse de déplacement du piston lorsque ce dernier ce déplace dans la direction qui le rapproche dudit fond. C'est ici le fond 2 qui est muni d'un tel dispositif, permettant de régler la vitesse du piston lorsque celui-ci se déplace de la droite vers la gauche en regardant les figures.According to the invention, one of the bottoms of the jack is provided a device for adjusting the speed of movement of the piston when the latter moves in the direction which brings it closer to said bottom. It is here the bottom 2 which is provided with such a device, making it possible to adjust the speed of the piston when the latter moves from right to left by looking at the figures.

Bien entendu, on munit chacun des deux fonds du même dispositif si on désire régler la vitesse du piston pour ses deux sens de déplacement ; revenant à l'exemple décrit, le dispositif de réglage de vitesse associé au fond 1 comprend un pointeau 70 dont l'extrémité 71 débouche dans un conduit 75A - 75B reliant l'alésage d'alimentation- échappement 21 à la chambre intérieure 31 du vérin.Of course, each of the two bottoms is provided with the same device if it is desired to adjust the speed of the piston for its two directions of movement; Returning to the example described, the speed adjusting device associated with the bottom 1 comprises a needle 70 whose end 71 opens into a conduit 75A - 75B connecting the supply-exhaust bore 21 to the internal chamber 31 of the jack .

Pour des commodités d'exécution, le conduit 75A - 75B est constitué de deux perçages sensiblement à angle droit, l'un 75A dans le prolongement de l'alésage 72, l'autre 75B débouchant sur un côté du fond 2. L'extrémité 71 du pointeau 70 obture plus ou moins le conduit 75A , et crée une perte de charge qui limite la vitesse d'échappement de l'air ou du gaz et par voie de conséquence, la vitesse de l'équipage mobile du vérin.For operational convenience, the conduit 75A - 75B consists of two bores substantially at right angles, one 75A in the extension of the bore 72, the other 75B opening on one side of the bottom 2. The end 71 of the needle 70 more or less closes the conduit 75A, and creates a pressure drop which limits the speed of escape of the air or gas and consequently, the speed of the movable member of the jack.

Cette perte de charge est réglable par enfoncement plus ou moins grand du pointeau, qui est vissé dans un alésage taraudé 72 et débouche à l'extérieur du fond 2 sur un de ses côtés.This pressure drop is adjustable by pressing the needle more or less large, which is screwed into a threaded bore 72 and opens outside the bottom 2 on one of its sides.

Un joint 73 et une plaquette d'arrêt 74 du pointeau complètent le dispositif. On constate que le dispositif de réglage est simple et permet d'ajuster la vitesse du piston par simple rotation de la tête du pointeau accessible de l'extérieur. Aucun organe ne dépasse du fond du vérin, ce qui permet un gain de place très appréciable, permettant notamment l'empilage de plusieurs vérins.A seal 73 and a needle stop plate 74 complete the device. It is found that the adjustment device is simple and makes it possible to adjust the speed of the piston by simple rotation of the head of the needle accessible from the outside. No member protrudes from the bottom of the jack, which allows a very significant saving of space, in particular allowing the stacking of several jacks.

On note que la présence du dispositif de réglage de la vitesse de déplacement du piston ne compromet pas le fonctionnement du système d'amortissement de fin de course dont est classiquement muni le vérin.It should be noted that the presence of the device for adjusting the speed of movement of the piston does not compromise the operation of the end-of-travel damping system with which the cylinder is conventionally provided.

Ce système comprend un conduit 80 percé dans le fond 2 parallèlement à l'axe du piston et débouche dans un alésage 81 partiellement obturé par un pointeau 82 accessible sur l'un des côtés du fond.This system comprises a conduit 80 pierced in the bottom 2 parallel to the axis of the piston and opens into a bore 81 partially closed by a needle 82 accessible on one of the sides of the bottom.

Le conduit 80 se prolonge par un conduit 84 qui débouche à l'intérieur de la chambre 31.The conduit 80 is extended by a conduit 84 which opens into the interior of the chamber 31.

Le fonctionnement est le suivant :

  • en fin de course, lorsque le dash-pot 41 commence à obturer la chambre 31, l'air contenu dans le cylindre passe par le conduit 80, est laminé par le pointeau 82, ce qui amortit le mouvement, passe par le conduit 84 dans la chambre 31 et s'échappe par le conduit 75A-75B et l'alésage 21.
The operation is as follows:
  • at the end of the race, when the dash-pot 41 begins to close off the chamber 31, the air contained in the cylinder passes through the conduit 80, is laminated by the needle 82, which dampens the movement, passes through the conduit 84 in the chamber 31 and escapes via the conduit 75A-75B and the bore 21.

Le trajet de l'air est représenté par des flèches.The air path is represented by arrows.

Claims (4)

1/ Vérin pneumatique à vitesse de fonctionnement réglable comprenant un cylindre, un piston, deux fonds d'extrémité et dans chaque fond un alésage pour l'alimentation et l'échappement, caractérisé en ce qu'au moins l'un desdits alésages (21) communique avec l'intérieur du cylindre par un conduit (75A, 75B) partiellement obturable par un pointeau (70).1 / Pneumatic cylinder with adjustable operating speed comprising a cylinder, a piston, two end bottoms and in each bottom a bore for supply and exhaust, characterized in that at least one of said bores (21 ) communicates with the interior of the cylinder by a conduit (75A, 75B) partially closable by a needle (70). 2/ Vérin pneumatique selon la revendication 1, caractérisé en ce que le pointeau (70) est vissé dans un alésage (72) taraudé du fond (2). 3/ Vérin pneumatique selon l'une des revendications 1 et 2, caractérisé en ce que le conduit (75A-75B) comprend une première portion (75A) dans le prolongement de l'alésage (72) communiquant avec l'intérieur du cylindre et une seconde portion (75B) sensiblement à angle droit débouchant dans l'alésage (21).2 / A pneumatic cylinder according to claim 1, characterized in that the needle (70) is screwed into a bore (72) threaded from the bottom (2). 3 / Pneumatic cylinder according to one of claims 1 and 2, characterized in that the conduit (75A-75B) comprises a first portion (75A) in the extension of the bore (72) communicating with the interior of the cylinder and a second portion (75B) substantially at right angles opening into the bore (21). 4/ Vérin selon l'une des revendications 1 à 3, caractérisé en ce que le conduit (75A-75B) communique avec l'intérieur du cylindre en débouchant dans une chambre d'amortissement (31) pratiquée dans le fond du cylindre (2), ladite chambre coopérant avec un dash-pot (41).4 / Cylinder according to one of claims 1 to 3, characterized in that the conduit (75A-75B) communicates with the interior of the cylinder by opening into a damping chamber (31) formed in the bottom of the cylinder (2 ), said chamber cooperating with a dash-pot (41). 5/ Vérin selon la revendication 4, caractérisé en ce qu'il comporte un pointeau (82) obturant partiellement un conduit (81, 84) pratiqué dans le fond et reliant la face interne du fond (2) avec l'intérieur de la chambre d'amortissement (31).5 / cylinder according to claim 4, characterized in that it comprises a needle (82) partially closing a conduit (81, 84) formed in the bottom and connecting the internal face of the bottom (2) with the interior of the chamber depreciation (31).
EP82401722A 1982-06-29 1982-09-23 Air cylinder with speed control Withdrawn EP0097751A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8211381A FR2529265B1 (en) 1982-06-29 1982-06-29 PNEUMATIC CYLINDER WITH ADJUSTABLE OPERATING SPEED
FR8211381 1982-06-29

Publications (1)

Publication Number Publication Date
EP0097751A1 true EP0097751A1 (en) 1984-01-11

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ID=9275505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401722A Withdrawn EP0097751A1 (en) 1982-06-29 1982-09-23 Air cylinder with speed control

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EP (1) EP0097751A1 (en)
ES (1) ES275448Y (en)
FR (1) FR2529265B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009016198A1 (en) * 2009-04-03 2010-10-07 Festo Ag & Co. Kg Fluid-actuated linear drive has housing with limiting closure wall that is also provided for drive piston of working chamber, where length portion of throttle channel, is directly connected to channel main section
EP2107257A3 (en) * 2008-03-31 2012-12-26 FESTO AG & Co. KG Fluid operated work cylinder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833312A (en) * 1955-10-26 1958-05-06 Flick Reedy Corp Orificed fluid flow controller
GB1036498A (en) * 1963-12-30 1966-07-20 Pneumatic Hydraulic Dev Compan Fluid power cylinder
FR1472663A (en) * 1966-03-25 1967-03-10 Festo Maschf Stoll G Single-acting cylinder for pressurized pneumatic fluids

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833312A (en) * 1955-10-26 1958-05-06 Flick Reedy Corp Orificed fluid flow controller
GB1036498A (en) * 1963-12-30 1966-07-20 Pneumatic Hydraulic Dev Compan Fluid power cylinder
FR1472663A (en) * 1966-03-25 1967-03-10 Festo Maschf Stoll G Single-acting cylinder for pressurized pneumatic fluids

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2107257A3 (en) * 2008-03-31 2012-12-26 FESTO AG & Co. KG Fluid operated work cylinder
DE102009016198A1 (en) * 2009-04-03 2010-10-07 Festo Ag & Co. Kg Fluid-actuated linear drive has housing with limiting closure wall that is also provided for drive piston of working chamber, where length portion of throttle channel, is directly connected to channel main section
DE102009016198B4 (en) * 2009-04-03 2013-01-17 Festo Ag & Co. Kg Fluid operated linear actuator with end position damping

Also Published As

Publication number Publication date
FR2529265A1 (en) 1983-12-30
ES275448U (en) 1984-03-01
ES275448Y (en) 1984-10-01
FR2529265B1 (en) 1985-06-28

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