EP0715932B1 - Procédé et appareil pour la régulation de la course de frappe d'un appareil à percussion mû par un fluide incompressible sous pression - Google Patents
Procédé et appareil pour la régulation de la course de frappe d'un appareil à percussion mû par un fluide incompressible sous pression Download PDFInfo
- Publication number
- EP0715932B1 EP0715932B1 EP95420353A EP95420353A EP0715932B1 EP 0715932 B1 EP0715932 B1 EP 0715932B1 EP 95420353 A EP95420353 A EP 95420353A EP 95420353 A EP95420353 A EP 95420353A EP 0715932 B1 EP0715932 B1 EP 0715932B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slide valve
- fluid
- distributor
- pressure
- fluid under
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
-
- 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
- B25D9/14—Control devices for the reciprocating piston
- B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof
Definitions
- the subject of the present invention is a method of regulation automatic stroke of the impact piston of a percussion device driven by an incompressible fluid under pressure and an apparatus for setting implementing this process.
- Percussion devices driven by an incompressible fluid under pressure are supplied with fluid, so that the resultant hydraulic forces applied successively on the piston of strike, move it alternately in one direction then in the other.
- the piston moves alternately inside a bore or cylinder, in which is provided, above the piston, a chamber which, delimited in part by this one, is conventionally called: upper room.
- a chamber which, delimited in part by this one, is conventionally called: upper room.
- this chamber is supplied with pressurized fluid, the hydraulic force, which is created there, allows the piston to describe its stroke.
- a second chamber also partly delimited by the piston, called conventionally: lower house. The resulting force of fluid pressure in the lower chamber ensures displacement of the piston for his return run.
- the overall power of a device is expressed by the product the value of the strike frequency and the value of the energy by stroke.
- the energy per blow is the kinetic energy given to the piston, which depends on the stroke and the supply pressure.
- Patent EP 0 214 064 describes an apparatus which makes it possible to obtain automatic adjustment of the percussion parameters, thanks to the presence in the cylinder of the apparatus of a channel supplied with fluid according to the position of the piston after the impact and the possible rebound of the piston on the tool.
- Patent EP 0 256 955 describes an apparatus which makes it possible to obtain the same result, depending on the pressure variations in the chamber upper or lower chamber, consecutive to the rebound effect of the piston on the tool, thanks to the presence of a hydraulic element sensitive to these variations.
- the object of the invention is to provide a method and an apparatus for its implementation, allowing an automatic adaptation of the frequency and energy per stroke of the piston of a percussion device, which is simple, reliable and compact, in order to be able to equip in particular small and medium power devices.
- the invention relates to a method for regulating the impact stroke of a percussion device, driven by a fluid incompressible under pressure, comprising a piston moving at the interior of a cylinder and delimiting with it an upper chamber and a lower chamber supplied sequentially with high fluid pressure by action of a distributor connected to a control device allowing the stroke of the striking piston to be varied, and comprising a drawer mounted in a cylinder on one side of which acts a spring and the other side of which can be subjected to fluid pressure, this drawer comprising a groove connected, on the one hand, to the distributor and, on the other hand, and depending on the axial position of the drawer, to one of several channels opening into the cylinder and capable of being connected with the lower chamber at the end of the displacement movement of the piston strikes upwards, characterized in that it consists, during the phase of piston rebound following impact, to determine existence possible instantaneous flow of fluid flowing from the upper chamber to the high pressure fluid supply circuit, determined at from the differential pressure between these two circuits then, if
- this process consists in carrying out the feeding possible in pressurized fluid, of the control device, only during the piston rebound phase, at the start of the movement of the distributor and while the distributor still supplies the upper chamber in high pressure fluid.
- an apparatus for implementation of this process includes a subject control drawer at the opposing fluid pressures prevailing, respectively, in the upper chamber and in the upper chamber supply circuit in fluid under high pressure, this drawer opening a supply circuit for the pressure fluid control device, when the difference between the pressure in the upper chamber and the pressure in the supply circuit exceeds a predetermined value.
- control drawer is mounted in a cylinder delimiting with the drawer two opposite connected chambers, respectively, to the upper chamber and to the fluid supply channel under high pressure, and into which two connected channels open, respectively, to a source of pressurized fluid and to the piloting, these two channels being capable of being put in communication by a groove in the control drawer, in a certain axial position thereof.
- the source of pressurized fluid supplying the control device through the cylinder of the control drawer can be constituted by the high pressure supply circuit itself or, through the upper room.
- the cylinder of the control drawer can therefore be connected to one or the other of these two pressure sources.
- the supply duct of the pressure fluid control device passes through a drawer device, the movement of which is mechanically linked to movement of the dispenser, and which includes a groove which, according to the drawer position, allows or not the passage of pressurized fluid in direction of the striking piston stroke selector, belonging to the steering system.
- the groove of the drawer, associated with the dispenser is positioned so that it does not allow the passage of fluid under pressure that during the start of the dispenser drawer stroke, at a moment when the distributor still allows the supply of the upper chamber in high pressure fluid.
- the drawer, associated with the dispenser can be either independent of the dispenser drawer, or be an integral part thereof.
- this device has a leak channel, in permanent communication or momentary with the supply circuit of the control device in pressurized fluid, intended to evacuate, at each cycle a quantity defined fluid, to bring the control device drawer back into the direction of reduction of the stroke of the impact piston, when this control device is no longer sufficiently supplied with fluid under pressure.
- the device shown in Figure 1, is a percussion device comprising a piston 1 sliding in a body 2, and coming to strike at each cycle a tool 3.
- a main distributor mounted in the body 2, including a drawer 4, allows to put the upper chamber 8 provided above of the piston, alternately in relation to the fluid supply high pressure 5, as shown in figure 1, or with the low circuit pressure 6, as shown in figure 2.
- the piston 1 forms with the body 2, a lower annular chamber 9, permanently supplied by channel 5, so that each position of the dispenser drawer, causes the strike stroke of piston 1, then the ascent stroke.
- the device comprises a drawer 15 comprising two opposite pilot chambers: on the one hand the chamber 20 connected by a channel 22 to the fluid supply channel 5 under high pressure and, on the other hand, the chamber 21 connected to the upper chamber 8.
- the apparatus also includes a second drawer 23 whose movement is mechanically linked to the movement of the drawer 4 of the main distributor and which includes a groove 24 making it possible to stop or let pass the fluid between a channel 16 coming from the first drawer 15 and a channel 18 ending in the control chamber of the travel selector drawer 13.
- the control circuit of the race selector 13 comprises a channel 14 connected to the high pressure fluid conduit 5, the slide 15, the channel 16, the drawer 23, and the channel 18 opening onto a section of the drawer stroke selector 13.
- drawer 15 is constantly kept in the low position by the supply pressure from the channel 5 and accumulator 7 via channel 22 and applying to the largest diameter of the drawer, while the section annular of this slide is connected to the low pressure circuit 6 by a channel 24.
- Channel 14, connected to supply channel 5, does not communicate not with channel 16.
- the control section of the race selector 13 is not supplied and this selector, thanks to the spring 19, remains in position low, connecting the control channel 12 of the distributor 4 with the channel 11 corresponding to the small strike stroke of the piston 1.
- Figure 3 shows the position of the moving parts when the ground, encountered by the tool, is hard.
- the striking piston 1 rebounds just after its impact on tool 3 and pushes the fluid back into the channel 17, while the main distributor 4 is still in the position in figure 1 and begins to move from the position of figure 1 to the position of figure 2.
- this differential pressure is sufficient to lift the drawer 15.
- the drawer 15 communication channel 14 and channel 16 via a groove 15a.
- the distributor 4 changes position, and the drawer 23, linked to this distributor, briefly connects the channel 16 to channel 18.
- This selector 13 then communicates the control channel 12 from main distributor 4 with channel 10 corresponding to the large piston stroke 1.
- the drawer 15 starts to move only when the flow snapshot goes from upper room 8 to channel 5, through the channel 17.
- the drawer 15 remains stationary.
- the channel 22 can be connected to channel 17, instead of channel 5.
- the movement of the drawer 15 is only sensitive to the pressure drop due to the instantaneous flow leaving the upper room 8.
- Figure 3 shows the position of the moving parts when, during the rebound of the piston, the slide 23, whose movement is linked to that of the distributor 4, allows the fluid to pass from the channel 16 to the channel 18 and the selector 13, at a chosen time, depending on the position relative of the groove 24 of this drawer and the outlet of the channels 16 and 18.
- This drawer 23 has a central channel 28 opening into a groove annular, making it possible to connect both channel 16, channel 18 and, at through a calibrated orifice, the low pressure circuit 6.
- the movements of the striking piston 1 and the distributor 4 remain constantly linked to each other. So at a position precise stroke of the piston 1, the distributor drawer and the drawer 23 will therefore be in a precise position.
- the right choice is to establish communication between channels 16 and 18, a few moments after the shock. Indeed, at the time of the shock of the piston on the tool, the drawer 15 tends to lift under the effect of the blow of ram due to the sudden stop of the striking piston, then goes down immediately, if the ground is tender, but remains raised a little longer if the ground is hard.
- the drawer 23 eliminates the influence of pressure variations in the upper chamber 8, not letting the fluid flow, towards the selector 13, only a little later, when the lifting of the drawer 15 actually corresponds to the presence of an installed flow rate of the upper chamber 8 towards channel 5, and therefore, a rebound of the piston on a hard ground.
- the calibrated orifice contained in the channel 28 evacuates to the low pressure circuit 6, all of the fluid from drawer 15 and channel 16.
- channel 18 does not receive more fluid, but on the contrary evacuates through the channel 28 the fluid contained in the pilot chamber of the drawer 13, allowing the maintenance in small stroke of the impact piston.
- FIG. 4 represents a variant of the invention according to which the distributor 4 and the drawer 23 form a single piece.
- channel 28 is deleted and replaced by channel 29 or a channel 30 comprising a calibrated orifice and connecting the channel 18 with the low circuit pressure 6.
- the drawer 13 is pushed up, so as to select the long stroke of the piston hit.
- FIG. 5 shows another embodiment of the invention, in which the drawer 15 is constituted by a valve, allowing energy recovery.
- this valve specially fitted out according to the invention, comprises a groove 15a making it possible to connect the channel 14, supplied in high pressure, with channel 16, when it is lifted.
- the piston 1 discharges the fluid contained in the upper chamber 8, directly through the passage 25, then channel 26 to the high pressure circuit 5, lifting the valve 15.
- the valve 15 remains raised as long as the pressure drop due to the flow between channels 25 and 26 is greater than the pressure value power multiplied by a constant depending on the sections of the valve.
- the supply pressure being kept constant moreover, the valve 15 therefore remains open from a planned discharge rate of the upper room 8.
- the throat of the valve connects the channel 14 with the channel 16. This allows, by the passage of fluid through the slide 23, to supply the channel 18 and therefore to control the race selector 13 so as to obtain a large stroke of the piston for hard ground.
- Figure 6 shows another embodiment of the invention, according to which the channel 14 is replaced by a channel 27 in communication with the upper chamber 8.
- the channel 27 is replaced by a channel 27 in communication with the upper chamber 8.
- the upper chamber is obviously under pressure.
- the fluid supply can therefore be taken from the upper room 8 instead of being taken as previously by the canal of arrival 5.
- the invention provides a improvement and simplification of the current state of the art in the area of automatic selection of strike stroke of these devices.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Percussive Tools And Related Accessories (AREA)
- Fluid-Pressure Circuits (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Electrophonic Musical Instruments (AREA)
Description
Claims (11)
- Procédé de régulation de la course de frappe d'un appareil à percussions, mû par un fluide incompressible sous pression, comprenant un piston (1) se déplaçant à l'intérieur d'un cylindre et délimitant avec celui-ci une chambre haute (8) et une chambre basse (9) alimentées de façon séquentielle en fluide sous haute pression par action d'un distributeur (4) relié à un dispositif de pilotage permettant de faire varier la course du piston de frappe, et comprenant un tiroir (13) monté dans un cylindre dont l'une des faces peut être soumise à une pression de fluide et comprenant un dispositif de rappel (19), ce tiroir comprenant une gorge reliée, d'une part, au distributeur (4) et, d'autre part, et en fonction de la position axiale du tiroir, à l'un de plusieurs canaux (10, 11) débouchant dans le cylindre et susceptibles d'être mis en communication avec la chambre basse (9) en fin du mouvement de déplacement du piston de frappe vers le haut, caractérisé en ce qu'il consiste, lors de la phase de rebond du piston consécutive à l'impact, à déterminer l'existence éventuelle d'un débit instantané de fluide s'écoulant de la chambre haute (8) vers le circuit d'alimentation (5) en fluide sous haute pression, déterminé à partir de la pression différentielle entre ces deux circuits puis, si un tel débit est détecté, à alimenter en fluide sous pression le dispositif de pilotage pour déplacer le tiroir (13) de celui-ci dans un sens d'allongement de la course du piston de frappe.
- Procédé selon la revendication 1, caractérisé en ce qu'il consiste à réaliser l'alimentation éventuelle en fluide sous pression, du dispositif de pilotage (13), uniquement pendant la phase de rebond du piston, au début du mouvement du distributeur et tandis que le distributeur alimente encore la chambre haute en fluide sous haute pression.
- Appareil pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce qu'il comporte un tiroir de commande (15) soumis aux pressions antagonistes de fluide régnant, respectivement, dans la chambre haute et dans le circuit d'alimentation de la chambre haute en fluide sous haute pression, ce tiroir (15) ouvrant un circuit d'alimentation (14, 16, 18) du dispositif de pilotage (13) en fluide sous pression, lorsque la différence entre la pression dans la chambre haute (8) et la pression dans le circuit d'alimentation dépasse une valeur prédéterminée.
- Appareil selon la revendication 2, caractérisé en ce que le tiroir de commande (15) est monté dans un cylindre délimitant avec le tiroir deux chambres opposées reliées, respectivement, à la chambre haute (8) et au canal d'alimentation (5) en fluide sous haute pression, et dans lequel débouchent deux canaux (14, 16) reliés, respectivement, à une source de fluide (5, 8) sous pression et au dispositif de pilotage (13), ces deux canaux étant susceptibles d'être mis en communication par une gorge (15a) que comporte le tiroir de commande (15), dans une certaine position axiale de celui-ci.
- Appareil selon la revendication 4, caractérisé en ce que l'un (14) des canaux débouchant dans le cylindre du tiroir de commande communique avec le conduit d'alimentation (5) de l'appareil en fluide sous haute pression.
- Appareil selon la revendication 4, caractérisé en ce que l'un (14) des canaux débouchant dans le cylindre du tiroir de commande communique avec la chambre haute (8).
- Appareil selon l'une quelconque des revendications 3 à 6, caractérisé en ce que le conduit (16) d'alimentation du dispositif de pilotage en fluide sous pression passe à travers un dispositif à tiroir (23), dont le mouvement est lié mécaniquement au mouvement du distributeur (4) et qui comprend une gorge (24) qui, suivant la position du tiroir, permet ou non le passage de fluide sous pression en direction du tiroir (13) sélecteur de course du piston de frappe, appartenant au dispositif de pilotage.
- Appareil selon la revendication 7, caractérisé en ce que la gorge (24) du tiroir (23), associée au distributeur (4), est positionnée de façon telle qu'elle ne permette le passage de fluide sous pression qu'au cours du début de la course du tiroir (4) du distributeur, à une période où le distributeur permet encore l'alimentation de la chambre haute (8) en fluide sous haute pression.
- Appareil selon l'une quelconque des revendications 7 et 8, caractérisé en ce que le tiroir (23), associé au distributeur (4), est indépendant du tiroir du distributeur et lié mécaniquement à ce dernier.
- Appareil selon l'une quelconque des revendications 7 et 8, caractérisé en ce que le tiroir (23) associé au distributeur, et le tiroir (4) du distributeur forment une seule pièce.
- Appareil selon l'une quelconque des revendications 3 à 10, caractérisé en ce qu'il comporte un canal de fuite (28), (29), (30), en communication permanente ou momentanée avec le circuit d'alimentation (18) du dispositif de pilotage (13) en fluide sous pression, destiné à évacuer, à chaque cycle une quantité définie de fluide, pour ramener le tiroir du dispositif de pilotage (13) dans le sens de la diminution de la course du piston de frappe, lorsque ce dispositif de pilotage n'est plus suffisamment alimenté en fluide sous pression.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9415020A FR2727891B1 (fr) | 1994-12-08 | 1994-12-08 | Procede et appareil pour la regulation de la course de frappe d'un appareil a percussion mu par un fluide incompressible sous pression |
FR9415020 | 1994-12-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0715932A1 EP0715932A1 (fr) | 1996-06-12 |
EP0715932B1 true EP0715932B1 (fr) | 2001-11-14 |
Family
ID=9469776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95420353A Expired - Lifetime EP0715932B1 (fr) | 1994-12-08 | 1995-12-06 | Procédé et appareil pour la régulation de la course de frappe d'un appareil à percussion mû par un fluide incompressible sous pression |
Country Status (13)
Country | Link |
---|---|
US (1) | US5669281A (fr) |
EP (1) | EP0715932B1 (fr) |
JP (1) | JP3713320B2 (fr) |
KR (1) | KR100427450B1 (fr) |
AT (1) | ATE208688T1 (fr) |
AU (1) | AU695964B2 (fr) |
CA (1) | CA2163582C (fr) |
DE (1) | DE69523867T2 (fr) |
ES (1) | ES2166392T3 (fr) |
FI (1) | FI955881A (fr) |
FR (1) | FR2727891B1 (fr) |
NO (1) | NO306934B1 (fr) |
ZA (1) | ZA9510110B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8151900B2 (en) | 2006-06-27 | 2012-04-10 | Montabert | Percussion equipment driven by a pressurized incompressible fluid |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2811601B1 (fr) * | 2000-07-13 | 2002-10-11 | Montabert Ets | Appareil hydraulique a percussions |
US6491114B1 (en) | 2000-10-03 | 2002-12-10 | Npk Construction Equipment, Inc. | Slow start control for a hydraulic hammer |
KR100569198B1 (ko) * | 2003-05-06 | 2006-04-07 | 이일재 | 유압타격장치 |
US7219955B2 (en) * | 2005-02-18 | 2007-05-22 | Atico Int Usa Inc | Anti-pinching device for use in a folding chair |
SE530885C2 (sv) * | 2007-02-23 | 2008-10-07 | Atlas Copco Rock Drills Ab | Förfarande vid slagverk, slagverk och bergborrmaskin |
CN102271874A (zh) * | 2008-12-24 | 2011-12-07 | 全球力量Ip有限公司 | 汽化系统 |
CN101927479B (zh) * | 2009-06-23 | 2014-10-22 | 蒙塔博特公司 | 液压冲击设备 |
CN101927478B (zh) * | 2009-06-23 | 2015-03-04 | 蒙塔博特公司 | 液压冲击设备 |
SE535801C2 (sv) * | 2011-04-27 | 2012-12-27 | Atlas Copco Rock Drills Ab | Slagverk, bergborrmaskin och borrigg |
FR2983760B1 (fr) | 2011-12-09 | 2014-08-15 | Montabert Roger | Procede de commutation de la course de frappe d'un piston de frappe d’un appareil a percussions |
DE102012012297A1 (de) * | 2012-03-30 | 2013-10-02 | Atlas Copco Construction Tools Gmbh | Ventil |
FR3027543B1 (fr) * | 2014-10-28 | 2016-12-23 | Montabert Roger | Appareil a percussions |
US9840000B2 (en) * | 2014-12-17 | 2017-12-12 | Caterpillar Inc. | Hydraulic hammer having variable stroke control |
US20160221171A1 (en) * | 2015-02-02 | 2016-08-04 | Caterpillar Inc. | Hydraulic hammer having dual valve acceleration control system |
FI3659752T3 (fi) * | 2017-07-24 | 2023-05-04 | Furukawa Rock Drill Co Ltd | Hydraulinen vasarointilaite |
FR3077753B1 (fr) * | 2018-02-14 | 2020-01-31 | Montabert | Procede de reglage de la course de frappe d’un piston de frappe d’un appareil a percussions, et un appareil a percussions pour la mise en œuvre de ce procede |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1703061C3 (de) * | 1968-03-27 | 1974-02-14 | Fried. Krupp Gmbh, 4300 Essen | Hydraulisch betriebener Schubkolbenmotor |
US3720137A (en) * | 1971-05-24 | 1973-03-13 | Milwaukee Cylinder Corp | Automatically reversing, double acting fluid cylinder mechanism |
US4016941A (en) * | 1973-03-08 | 1977-04-12 | Sanders William H | Hand-size fluid-powered tool reciprocator |
SE8106907L (sv) * | 1981-11-20 | 1983-05-21 | Atlas Copco Ab | Sett att styra ett slagverk och slagverk |
FR2595972B2 (fr) * | 1985-07-16 | 1989-10-20 | Montabert Ets | Appareil a percussions |
EP0236721A3 (fr) * | 1986-03-11 | 1989-10-25 | NITTETSU JITSUGYO CO., Ltd. | Concasseur hydraulique |
FR2602448B1 (fr) * | 1986-08-07 | 1988-10-21 | Montabert Ets | Procede de regulation des parametres de percussion du piston de frappe d'un appareil mu par un fluide incompressible sous pression, et appareil pour la mise en oeuvre de ce procede |
FR2618092B1 (fr) * | 1987-07-17 | 1989-11-10 | Montabert Ets | Distributeur hydraulique pour appareil a percussions mu par un fluide incompressible sous pression |
DE4019016A1 (de) * | 1990-06-14 | 1991-06-13 | Krupp Maschinentechnik | Verfahren zur beeinflussung des betriebsverhaltens eines schlagwerks und einrichtung zur durchfuehrung des verfahrens |
-
1994
- 1994-12-08 FR FR9415020A patent/FR2727891B1/fr not_active Expired - Fee Related
-
1995
- 1995-11-23 CA CA002163582A patent/CA2163582C/fr not_active Expired - Fee Related
- 1995-11-28 ZA ZA9510110A patent/ZA9510110B/xx unknown
- 1995-11-30 US US08/565,577 patent/US5669281A/en not_active Expired - Fee Related
- 1995-12-06 EP EP95420353A patent/EP0715932B1/fr not_active Expired - Lifetime
- 1995-12-06 ES ES95420353T patent/ES2166392T3/es not_active Expired - Lifetime
- 1995-12-06 AU AU40275/95A patent/AU695964B2/en not_active Ceased
- 1995-12-06 DE DE69523867T patent/DE69523867T2/de not_active Expired - Fee Related
- 1995-12-06 AT AT95420353T patent/ATE208688T1/de not_active IP Right Cessation
- 1995-12-07 FI FI955881A patent/FI955881A/fi unknown
- 1995-12-07 NO NO954971A patent/NO306934B1/no unknown
- 1995-12-08 JP JP32074495A patent/JP3713320B2/ja not_active Expired - Fee Related
- 1995-12-08 KR KR1019950047681A patent/KR100427450B1/ko not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8151900B2 (en) | 2006-06-27 | 2012-04-10 | Montabert | Percussion equipment driven by a pressurized incompressible fluid |
Also Published As
Publication number | Publication date |
---|---|
NO954971D0 (no) | 1995-12-07 |
JP3713320B2 (ja) | 2005-11-09 |
AU695964B2 (en) | 1998-08-27 |
AU4027595A (en) | 1996-06-13 |
JPH08216051A (ja) | 1996-08-27 |
US5669281A (en) | 1997-09-23 |
NO954971L (no) | 1996-06-10 |
FI955881A0 (fi) | 1995-12-07 |
DE69523867D1 (de) | 2001-12-20 |
CA2163582C (fr) | 2006-04-04 |
FR2727891B1 (fr) | 1997-01-24 |
FR2727891A1 (fr) | 1996-06-14 |
KR960021401A (ko) | 1996-07-18 |
CA2163582A1 (fr) | 1996-06-09 |
ZA9510110B (en) | 1996-06-06 |
ATE208688T1 (de) | 2001-11-15 |
NO306934B1 (no) | 2000-01-17 |
EP0715932A1 (fr) | 1996-06-12 |
ES2166392T3 (es) | 2002-04-16 |
DE69523867T2 (de) | 2002-04-18 |
KR100427450B1 (ko) | 2004-07-16 |
FI955881A (fi) | 1996-06-09 |
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