EP0071546B1 - Tightness system between the hydraulic and external medium in percussion devices - Google Patents

Tightness system between the hydraulic and external medium in percussion devices Download PDF

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Publication number
EP0071546B1
EP0071546B1 EP82420092A EP82420092A EP0071546B1 EP 0071546 B1 EP0071546 B1 EP 0071546B1 EP 82420092 A EP82420092 A EP 82420092A EP 82420092 A EP82420092 A EP 82420092A EP 0071546 B1 EP0071546 B1 EP 0071546B1
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EP
European Patent Office
Prior art keywords
chamber
buffer chamber
hydraulic fluid
fluid
communicates
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EP82420092A
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German (de)
French (fr)
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EP0071546A1 (en
Inventor
Roger Montabert
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Montabert SAS
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Montabert SAS
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Priority to AT82420092T priority Critical patent/ATE8854T1/en
Publication of EP0071546A1 publication Critical patent/EP0071546A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/04—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member

Definitions

  • the present invention relates to a percussion device driven by an incompressible fluid under pressure, such as a hydraulic fluid.
  • This device has the general structure shown in FIG. 1 of the attached schematic drawing. It comprises a striking striking mass (2) in the form of a piston providing a succession of percussions on a tool (3).
  • the displacement of the piston (2) is obtained by placing in communication a chamber (4) located above the piston, alternately with a high pressure circuit and with a low pressure circuit.
  • An annular chamber (5) of small surface and antagonistic to the chamber (4) is maintained either constantly or alternatively in relation to the high pressure circuit, so that the result of the hydraulic forces is exerted alternately in one direction and in the other.
  • the chamber (5) formed in the cylinder (1) of the body of the device is generally separated from the external environment by a cylindrical surface (6) serving to guide the piston (2), then by a chamber (7) serving to collect the inevitable leaks of hydraulic fluid passing through the play existing between the piston (2) and the bearing (6), a sealing system (8) being provided beyond the chamber (7), comprising one or more seals d sealing.
  • the hydraulic fluid recovery chamber (7) is usually connected to the device's drainage circuit (9) which is itself connected either to the device's low pressure circuit (10) or to a circuit. exterior (12) independent of drainage.
  • the annular clearance existing between the cylindrical seat (6) and the piston (2) is constantly filled with fluid coming from the chamber (5), the pressure of the fluid varying progressively from the high pressure near the chamber (5), to the pressure of the drainage circuit near the chamber (7).
  • the object of the invention is to significantly reduce or even eliminate the pressure waves in the chamber (7) and in the drainage circuit.
  • the hydraulic fluid recovery chamber is associated with a buffer chamber delimited at least partially by a deformable wall and containing a fluid compressible under low pressure.
  • This buffer chamber is capable, upon impact of the piston, of rapidly deforming under the effect of pressure and, as a result, of releasing a certain volume for the fluid repelled by the piston upon impact, avoiding thus a significant increase in the pressure of the hydraulic fluid in the recovery chamber thereof.
  • the fluid flows slowly through the drainage circuit, pushed back by the deformable wall of the buffer chamber which returns to its initial shape.
  • the buffer chamber is arranged inside the hydraulic fluid recovery chamber.
  • the buffer chamber is housed in a cavity which, formed in the body of the device, communicates with the hydraulic fluid recovery chamber by at least one wide section channel.
  • the buffer chamber is housed outside the body of the device and communicates with the hydraulic fluid recovery chamber by at least one wide section channel.
  • the buffer chamber can either be arranged laterally or be annular.
  • the buffer chamber is either sealed and filled with a gas under low pressure, or filled with air, and brought to atmospheric pressure by communication with the outside.
  • an element (13) in which are fixed the two edges of a membrane (14) delimiting with the element (13) an annular chamber (15) .
  • Figs. 2 and 3 show three possibilities of mounting the membrane (14) on elements (13) having different respective shapes.
  • One of the buffer chambers (15) shown in FIG. 3 is constituted by a tubular membrane (16).
  • the buffer chamber (15) can either be formed in a leaktight manner and contain a compressible gas under low pressure, or be filled with air and communicate with the outside, for example by a channel (17), shown in dotted lines in the drawing.
  • an element (18) is fixed in the chamber (7), which provides a cavity (19) in which the buffer chamber (20) is mounted.
  • the buffer chamber can be constituted either by a tubular hose (22), or by a membrane (23), the two edges of which are fixed in the element (18).
  • the communication of the cavity (19) containing the chamber (20) with the chamber (7) is done either by channels (24) formed in the body of the device, or by channels (25) formed in the element (18).
  • Fig. 5 shows a third type of buffer chamber according to which the buffer chamber (26) is arranged laterally to the device, and formed outside of it in the left part and inside of it in the part right.
  • This chamber (26) is separated by a membrane (27) from a chamber (28) communicating with the fluid recovery chamber (7) by a wide section channel (29).
  • the latter may or may not communicate with the outside via a channel (30).
  • the membrane delimiting, at least partially, the buffer chamber will deform in a direction of reduction of the volume of the buffer chamber, thus increasing the volume available for the fluid hydraulic in the chamber (7) and avoiding an excessively sudden increase in pressure inside this chamber.
  • the fluid flows slowly through the drainage circuit (9) or (12), pushed back by the deformable membrane of the buffer chamber, which returns to its initial shape.
  • the drainage circuit (9) is connected to the low pressure circuit (10) of the apparatus, there is provided, on the drainage circuit (9), a non-return valve (32), so that that the fluid cannot pass from the low pressure circuit (10) to the chamber (7) for recovering hydraulic fluid.
  • this chamber is isolated from pressure fluctuations existing in the low pressure circuit, the valve (32) opening when the pressure in the low pressure circuit is lower than that in the chamber (7), allowing the evacuation of the excess fluid stored during the deformation of the buffer chamber.
  • the invention brings a great improvement to the existing technique by providing a device of simple design ensuring the maintenance of the drainage circuit of the device under a fluid pressure whose fluctuations are modest, thus saving at the seals and the sealing system of the device, rapid destruction.

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  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Pipe Accessories (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Earth Drilling (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Electroluminescent Light Sources (AREA)
  • General Details Of Gearings (AREA)
  • Sealing Devices (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

A power cylinder of a hydraulic percussion implement, in whose bore a ram with an enlarged piston head is vertically reciprocable to strike a tool at the lower end of the bore, has a control chamber above the piston head alternately communicating with the high-pressure side and the low-pressure side of a source of hydraulic fluid, an annular recess in the bore being permanently or intermittently connected to high pressure acting upon the underside of the piston head. An annular drainage chamber formed by the bore at a lower level, disposed above an oil seal, collects liquid leaking down from that recess and returns it to the source. A pneumatic buffer lies in or communicates with that drainage chamber for absorbing hydraulic shocks generated when the ram strikes the tool.

Description

La présente invention a pour objet un appareil à percussions mû par un fluide incompressible sous pression, tel qu'un fluide hydraulique.The present invention relates to a percussion device driven by an incompressible fluid under pressure, such as a hydraulic fluid.

Cet appareil possède la structure générale représentée à la fig. 1 du dessin schématique annexé. Il comprend une masse frappante mobile (2) en forme de piston fournissant une succession de percussions sur un outil (3).This device has the general structure shown in FIG. 1 of the attached schematic drawing. It comprises a striking striking mass (2) in the form of a piston providing a succession of percussions on a tool (3).

Le déplacement du piston (2) est obtenu par la mise en communication d'une chambre (4) située au-dessus du piston, alternativement avec un circuit haute pression et avec un circuit basse pression.The displacement of the piston (2) is obtained by placing in communication a chamber (4) located above the piston, alternately with a high pressure circuit and with a low pressure circuit.

Une chambre annulaire (5) de faible surface et antagoniste à la chambre (4) est maintenue soit constamment, soit alternativement en relation avec le circuit haute pression, de telle sorte que la résultante des forces hydrauliques s'exerce alternativement dans un sens et dans l'autre.An annular chamber (5) of small surface and antagonistic to the chamber (4) is maintained either constantly or alternatively in relation to the high pressure circuit, so that the result of the hydraulic forces is exerted alternately in one direction and in the other.

La chambre (5) ménagée dans le cylindre (1) du corps de l'appareil est généralement séparée du milieu extérieur par une portée cylindrique (6) servant au guidage du piston (2), puis par une chambre (7) servant à collecter les inévitables fuites de fluide hydraulique passant par le jeu existant entre le piston (2) et la portée (6), un système d'étanchéité (8) étant prévu au-delà de la chambre (7), comportant un ou plusieurs joints d'étanchéité.The chamber (5) formed in the cylinder (1) of the body of the device is generally separated from the external environment by a cylindrical surface (6) serving to guide the piston (2), then by a chamber (7) serving to collect the inevitable leaks of hydraulic fluid passing through the play existing between the piston (2) and the bearing (6), a sealing system (8) being provided beyond the chamber (7), comprising one or more seals d sealing.

La chambre (7) de récupération de fluide hydraulique est habituellement mise en relation avec le circuit (9) de drainage de l'appareil qui est lui-même relié soit au circuit basse pression (10) de l'appareil, soit à un circuit extérieur (12) indépendant du drainage.The hydraulic fluid recovery chamber (7) is usually connected to the device's drainage circuit (9) which is itself connected either to the device's low pressure circuit (10) or to a circuit. exterior (12) independent of drainage.

Le jeu annulaire existant entre la portée cylindrique (6) et le piston (2) est constamment rempli de fluide provenant de la chambre (5), la pression du fluide variant progressivement de la haute pression près de la chambre (5), à la pression du circuit de drainage près de la chambre (7).The annular clearance existing between the cylindrical seat (6) and the piston (2) is constantly filled with fluid coming from the chamber (5), the pressure of the fluid varying progressively from the high pressure near the chamber (5), to the pressure of the drainage circuit near the chamber (7).

Au moment de l'impact du piston (2) sur l'outil (3), une onde de compression parcourt le piston pendant un temps très bref. Cette onde de compression est accompagnée d'une onde de dilatation transversale du piston, qui réduit le volume de la chambre (7) et également le jeu annulaire entre le piston (2) et la portée cylindrique (6).At the moment of impact of the piston (2) on the tool (3), a compression wave travels through the piston for a very short time. This compression wave is accompanied by a transverse expansion wave of the piston, which reduces the volume of the chamber (7) and also the annular clearance between the piston (2) and the cylindrical seat (6).

Cette brusque diminution de volume provoque, dans la chambre (7) qui est remplie de fluide incompressible, une onde de pression violente et brève qui se propage à l'intérieur de cette chambre (7) et dans le circuit de drainage (9) ou (12).This abrupt reduction in volume causes, in the chamber (7) which is filled with incompressible fluid, a violent and brief pressure wave which propagates inside this chamber (7) and in the drainage circuit (9) or (12).

Compte-tenu de l'incompressibilité du fluide hydraulique et de l'inertie de celui-ci à s'échapper par les circuits (9), (12), il se produit à chaque impact une très forte montée en pression suivie d'une chute brutale, voire cavitation, due à l'écoulement du fluide dans le circuit de drainage, phénomène dont la nature est très préjudiciable pour la bonne tenue mécanique des joints de l'appareil et notamment du système d'étanchéité (8).Given the incompressibility of the hydraulic fluid and the inertia of the latter to escape through the circuits (9), (12), there is a very strong rise in pressure at each impact followed by a sudden fall, even cavitation, due to the flow of the fluid in the drainage circuit, a phenomenon the nature of which is very detrimental for the good mechanical strength of the seals of the apparatus and in particular of the sealing system (8).

Le but de l'invention est de réduire de façon importante, voire d'éliminer les ondes de pression dans la chambre (7) et dans le circuit de drainage.The object of the invention is to significantly reduce or even eliminate the pressure waves in the chamber (7) and in the drainage circuit.

A cet effet, à la chambre de récupération du fluide hydraulique est associée une chambre tampon délimitée au moins partiellement par une paroi déformable et contenant un fluide compressible sous une faible pression.To this end, the hydraulic fluid recovery chamber is associated with a buffer chamber delimited at least partially by a deformable wall and containing a fluid compressible under low pressure.

Cette chambre tampon est capable, lors de l'impact du piston, de se déformer rapidement sous l'effet de la pression et, de ce fait, de dégager un certain volume pour le fluide repoussé par le piston lors de l'impact, évitant ainsi une augmentation importante de pression du fluide hydraulique dans la chambre de récupération de celui-ci.This buffer chamber is capable, upon impact of the piston, of rapidly deforming under the effect of pressure and, as a result, of releasing a certain volume for the fluid repelled by the piston upon impact, avoiding thus a significant increase in the pressure of the hydraulic fluid in the recovery chamber thereof.

Pendant le reste du cycle de l'appareil, le fluide s'écoule lentement dans le circuit de drainage, repoussé par la paroi déformable de la chambre tampon qui reprend sa forme initiale.During the rest of the device cycle, the fluid flows slowly through the drainage circuit, pushed back by the deformable wall of the buffer chamber which returns to its initial shape.

Selon une première possibilité, la chambre tampon est disposée à l'intérieur de la chambre de récupération de fluide hydraulique.According to a first possibility, the buffer chamber is arranged inside the hydraulic fluid recovery chamber.

Selon une seconde possibilité, la chambre tampon est logée dans une cavité qui, ménagée dans le corps de l'appareil, communique avec la chambre de récupération du fluide hydraulique par au moins un canal de large section.According to a second possibility, the buffer chamber is housed in a cavity which, formed in the body of the device, communicates with the hydraulic fluid recovery chamber by at least one wide section channel.

Selon une autre possibilité, la chambre tampon est logée à l'extérieur du corps de l'appareil et communique avec la chambre de récupération de fluide hydraulique par au moins un canal de large section.According to another possibility, the buffer chamber is housed outside the body of the device and communicates with the hydraulic fluid recovery chamber by at least one wide section channel.

La chambre tampon peut soit être disposée latéralement, soit être annulaire.The buffer chamber can either be arranged laterally or be annular.

Selon une autre caractéristique de l'invention, la chambre tampon est soit étanche et remplie d'un gaz sous faible pression, soit remplie d'air, et mise à la pression atmosphérique par une communication avec l'extérieur.According to another characteristic of the invention, the buffer chamber is either sealed and filled with a gas under low pressure, or filled with air, and brought to atmospheric pressure by communication with the outside.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant, à titre d'exemples non limitatifs, plusieurs formes d'exécution de ce dispositif:

  • figi 2 et 3 sont deux vues correspondant à quatre demi-coupes longitudinales de la partie de l'appareil contenant la chambre de récupération de fluide, correspondant à un premier type de montage de la chambre tampon;
  • fig. 4 est une vue correspondant à deux demi-coupes longitudinales de la partie de l'appareil contenant la chambre de récupération de fluide, correspondant à un second type de montage de la chambre tampon;
  • fig. 5 est une vue correspondant à deux demi-coupes longitudinales de la partie de l'appareil contenant la chambre de récupération de fluide, correspondant à un troisième type de montage de la chambre tampon.
In any case, the invention will be clearly understood with the aid of the description which follows with reference to the appended schematic drawing representing, by way of nonlimiting examples, several embodiments of this device:
  • figi 2 and 3 are two views corresponding to four longitudinal half-sections of the part of the device containing the fluid recovery chamber, corresponding to a first type of mounting of the buffer chamber;
  • fig. 4 is a view corresponding to two longitudinal half-sections of the part of the device containing the fluid recovery chamber, corresponding to a second type of mounting of the buffer chamber;
  • fig. 5 is a view corresponding to two longitudinal half-sections of the part of the device containing the fluid recovery chamber, corresponding to a third type of mounting of the buffer chamber.

Dans la forme d'exécution représentée aux fig. 2 et 3, à l'intérieur de la chambre tampon (7) est monté un élément (13) dans lequel sont fixés les deux bords d'une membrane (14) délimitant avec l'élément (13) une chambre annulaire (15).In the embodiment shown in fig. 2 and 3, inside the buffer chamber (7) is mounted an element (13) in which are fixed the two edges of a membrane (14) delimiting with the element (13) an annular chamber (15) .

Les fig. 2 et 3 représentent trois possibilités de montage de la membrane (14) sur des éléments (13) possédant des formes respectives différentes.Figs. 2 and 3 show three possibilities of mounting the membrane (14) on elements (13) having different respective shapes.

L'une des chambres tampons (15) représentée à la fig. 3 est constituée par une membrane tubulaire (16). Dans la mesure où la membrane (14) est associée à un élément de fixation (13), la chambre tampon (15) peut soit être formée de manière étanche et contenir un gaz compressible sous faible pression, soit être remplie d'air et communiquer avec l'extérieur par exemple par un canal (17), représenté en pointillés au dessin.One of the buffer chambers (15) shown in FIG. 3 is constituted by a tubular membrane (16). Insofar as the membrane (14) is associated with a fixing element (13), the buffer chamber (15) can either be formed in a leaktight manner and contain a compressible gas under low pressure, or be filled with air and communicate with the outside, for example by a channel (17), shown in dotted lines in the drawing.

Dans la forme d'exécution représentée à la fig.4, un élément (18) est fixé dans la chambre (7), qui ménage une cavité (19) dans laquelle est montée la chambre tampon (20).In the embodiment shown in fig.4, an element (18) is fixed in the chamber (7), which provides a cavity (19) in which the buffer chamber (20) is mounted.

Dans ce cas encore, la chambre tampon peut être constituée soit par un boyau tubulaire (22), soit par une membrane (23) dont les deux bords sont fixés dans l'élément (18).In this case also, the buffer chamber can be constituted either by a tubular hose (22), or by a membrane (23), the two edges of which are fixed in the element (18).

La mise en communication de la cavité (19) contenant la chambre (20) avec la chambre (7), se fait soit par des canaux (24) ménagés dans le corps de l'appareil, soit par des canaux (25) ménagés dans l'élément (18).The communication of the cavity (19) containing the chamber (20) with the chamber (7) is done either by channels (24) formed in the body of the device, or by channels (25) formed in the element (18).

La fig. 5 représente un troisième type de chambre tampon selon lequel la chambre tampon (26) est disposée latéralement à l'appareil, et ménagée à l'extérieur de celui-ci dans la partie gauche et à l'intérieur de celui-ci dans la partie droite. Cette chambre (26) est séparée par une membrane (27) d'une chambre (28) communiquant avec la chambre de récupération de fluide (7) par un canal (29) de large section.Fig. 5 shows a third type of buffer chamber according to which the buffer chamber (26) is arranged laterally to the device, and formed outside of it in the left part and inside of it in the part right. This chamber (26) is separated by a membrane (27) from a chamber (28) communicating with the fluid recovery chamber (7) by a wide section channel (29).

En fonction de la nature du fluide contenu dans la chambre (26), celle-ci pourra ou non communiquer avec l'extérieur par un canal (30).Depending on the nature of the fluid contained in the chamber (26), the latter may or may not communicate with the outside via a channel (30).

D'un point de vue pratique, lors de l'impact du piston, la membrane délimitant, au moins partiellement, la chambre tampon va se déformer dans un sens de diminution du volume de la chambre tampon, augmentant ainsi le volume disponible pour le fluide hydraulique dans la chambre (7) et évitant une augmentation trop brutale de pression à l'intérieur de cette chambre.From a practical point of view, upon impact of the piston, the membrane delimiting, at least partially, the buffer chamber will deform in a direction of reduction of the volume of the buffer chamber, thus increasing the volume available for the fluid hydraulic in the chamber (7) and avoiding an excessively sudden increase in pressure inside this chamber.

Pendant le reste du cycle de l'appareil, le fluide s'écoule lentement par le circuit de drainage (9) ou (12), repoussé par la membrane déformable de la chambre tampon, qui reprend sa forme initiale.During the rest of the device cycle, the fluid flows slowly through the drainage circuit (9) or (12), pushed back by the deformable membrane of the buffer chamber, which returns to its initial shape.

Dans le mesure où le circuit de drainage (9) est relié au circuit basse pression (10) de l'appareil, il est prévu, sur le circuit de drainage (9), un clapet anti-retour (32), de telle sorte que le fluide ne puisse pas passer du circuit basse pression (10), vers la chambre (7) de récupération de fluide hydraulique. Ainsi, cette chambre se trouve isolée par rapport aux fluctuations de pression existant dans le circuit basse pression, le clapet (32) s'ouvrant lorsque la pression dans le circuit basse pression est plus faible que celle dans la chambre (7), permettant l'évacuation de l'excédent de fluide emmagasiné lors de la déformation de la chambre tampon.Insofar as the drainage circuit (9) is connected to the low pressure circuit (10) of the apparatus, there is provided, on the drainage circuit (9), a non-return valve (32), so that that the fluid cannot pass from the low pressure circuit (10) to the chamber (7) for recovering hydraulic fluid. Thus, this chamber is isolated from pressure fluctuations existing in the low pressure circuit, the valve (32) opening when the pressure in the low pressure circuit is lower than that in the chamber (7), allowing the evacuation of the excess fluid stored during the deformation of the buffer chamber.

Comme il ressort de ce qui précède, l'invention apporte une grande amélioration à la technique existante en fournissant un dispositif de conception simple assurant le maintien du circuit de drainage de l'appareil sous une pression de fluide dont les fluctuations sont modestes, épargnant ainsi aux joints et au système d'étanchéité de l'appareil, une destruction rapide.As is apparent from the above, the invention brings a great improvement to the existing technique by providing a device of simple design ensuring the maintenance of the drainage circuit of the device under a fluid pressure whose fluctuations are modest, thus saving at the seals and the sealing system of the device, rapid destruction.

Claims (9)

1. A percussion apparatus moved by a fluid which is incompressible under pressure, of the type comprising a piston (2) which, supplying a series of impacts on a tool (3), is displaced by connecting a chamber (4) located thereabove alternately to a high pressure circuit and to a low pressure circuit, an annular chamber (5), having a small surface area and opposing the chamber (4) being provided, which is either constantly or alternately connected to the high pressure circuit, and which is separated from the external medium by a cylindrical bearing (6) serving to guide the piston, a chamber (7) for recovering leakages of hydraulic fluid and a sealing system (8), characterized in that there is connected to the chamber (7) for recovering the hydraulic fluid, a buffer chamber (15) at least partially delimited by a deformable wall (14) and containing a fluid which can be compressed at a low pressure.
2. An apparatus as claimed in claim 1, characterized in that the buffer chamber (15) is arranged inside the chamber (7) for the recovery of hydraulic fluid.
3. An apparatus as claimed in claim 1, characterized in that the buffer chamber (20) is located in a cavity (19) which, provided in the body of the apparatus, communicates with the chamber (7) for the recovery of hydraulic fluid by means of at least one duct (24, 25) having a large section.
4. An apparatus as claimed in any one of claims 1 to 3, characterized in that the buffer chamber (15, 20) is annular.
5. An apparatus as claimed in any one of claims 1 to 3, characterized in that the buffer chamber (26) is arranged laterally on the apparatus.
6. An apparatus as claimed in claim 5, characterized in that the buffer chamber (26) is located externally of the body of the apparatus and communicates with the chamber (7) for the recovery of hydraulic fluid by means of at least one duct (29) having a large section.
7. An apparatus as claimed in claim 5, characterized in that the buffer chamber (26) is located inside the body of the apparatus and communicates with the chamber (7) for the recovery of the hydraulic fluid by means of at least one duct (29) having a large section.
8. An apparatus as claimed in any one of claims 1 to 7, characterized in that the buffer chamber (15, 20, 26) is closed in an impervious manner and is filled with a low pressure gas.
9. An apparatus as claimed in any one of claims 1 to 7, characterized in that the buffer chamber (15, 20, 26) is filled with air and communicates with the external medium.
EP82420092A 1981-07-17 1982-07-06 Tightness system between the hydraulic and external medium in percussion devices Expired EP0071546B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82420092T ATE8854T1 (en) 1981-07-17 1982-07-06 SEALING DEVICES FOR PERCUSSION MACHINES BETWEEN HYDRAULIC AND EXTERNAL MEDIUM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114304 1981-07-17
FR8114304A FR2509652A1 (en) 1981-07-17 1981-07-17 IMPROVEMENT IN THE SEALING SYSTEM BETWEEN THE HYDRAULIC ENVIRONMENT AND THE OUTER ENVIRONMENT OF A PERCUSSION APPARATUS

Publications (2)

Publication Number Publication Date
EP0071546A1 EP0071546A1 (en) 1983-02-09
EP0071546B1 true EP0071546B1 (en) 1984-08-08

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EP82420092A Expired EP0071546B1 (en) 1981-07-17 1982-07-06 Tightness system between the hydraulic and external medium in percussion devices

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US (1) US4508017A (en)
EP (1) EP0071546B1 (en)
JP (1) JPS599315B2 (en)
AT (1) ATE8854T1 (en)
AU (1) AU536362B2 (en)
CA (1) CA1200734A (en)
DE (2) DE3260542D1 (en)
ES (1) ES513726A0 (en)
FI (1) FI822338L (en)
FR (1) FR2509652A1 (en)
NO (1) NO151110C (en)
ZA (1) ZA825105B (en)

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Also Published As

Publication number Publication date
FR2509652B1 (en) 1984-04-20
AU8609682A (en) 1983-07-28
NO151110C (en) 1985-02-13
NO151110B (en) 1984-11-05
JPS599315B2 (en) 1984-03-01
ES8304467A1 (en) 1983-03-16
JPS5871082A (en) 1983-04-27
FR2509652A1 (en) 1983-01-21
US4508017A (en) 1985-04-02
FI822338L (en) 1983-01-18
EP0071546A1 (en) 1983-02-09
DE3260542D1 (en) 1984-09-13
ATE8854T1 (en) 1984-08-15
NO822475L (en) 1983-01-18
CA1200734A (en) 1986-02-18
DE71546T1 (en) 1983-06-23
ZA825105B (en) 1983-04-27
FI822338A0 (en) 1982-06-30
ES513726A0 (en) 1983-03-16
AU536362B2 (en) 1984-05-03

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