WO2006117490A1 - Percussive pneumatic tool - Google Patents

Percussive pneumatic tool Download PDF

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Publication number
WO2006117490A1
WO2006117490A1 PCT/FR2006/050374 FR2006050374W WO2006117490A1 WO 2006117490 A1 WO2006117490 A1 WO 2006117490A1 FR 2006050374 W FR2006050374 W FR 2006050374W WO 2006117490 A1 WO2006117490 A1 WO 2006117490A1
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WO
WIPO (PCT)
Prior art keywords
piston
pressure
length
piston head
distance
Prior art date
Application number
PCT/FR2006/050374
Other languages
French (fr)
Inventor
Alain Mucig
Guillaume Novero
Original Assignee
Sullair Europe
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 Sullair Europe filed Critical Sullair Europe
Priority to EP06743831A priority Critical patent/EP1883506A1/en
Publication of WO2006117490A1 publication Critical patent/WO2006117490A1/en

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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
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/18—Valve arrangements therefor involving a piston-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves

Definitions

  • the invention relates in particular to the technical sector of pneumatic tools, including percussion tools hammer-breaker type, concrete breaker, ...
  • the invention relates more particularly to pneumatic tools whose operating principle is based on the sending of pressurized air by means of a trigger, for controlling a piston which acts, for example, on a striking member.
  • the jackhammer, concrete breaker or other is subject to an energy generator which comprises, for the most part, a heat engine, a compressor and an oil circuit.
  • the pressure required for proper operation is of the order of 6 to 7 bars. This pressure involves the use of a compressor with cooling, sealing and lubrication obtained by the oil circuit. It appears that this oil circuit represents about 30% of the space requirement in a compressor.
  • phase 4 the air causes the piston to go down through the distribution.
  • phase 5 the piston hits the tool.
  • the volume above the piston is found in the open air, the cycle starting again according to phase 1.
  • the piston stroke is equal to the sum of the length of the piston head and the distance traveled by said piston resulting from its inertia at the time of its ascent less the difference between the distance between the exhaust ports furthest away and the distance traveled by said piston resulting from its momentum at the time of its descent.
  • the distance traveled by the piston resulting from its momentum at the time of its rise is between 0 and 0.35 times the length of the piston head.
  • the compressor operates without oil being able to deliver a pressure of less than 2 bar.
  • FIG. 1 is a sectional view of an example of jackhammer
  • FIG. 1 shows a jackhammer type pneumatic tool comprising, in a manner perfectly known to those skilled in the art, a body (1) delimiting two coaxial bores of different diameter (la) and (Ib) for mounting with sealing ability, a piston (2) adapted to act on a striking member (3).
  • the piston head (2a) slides in the larger diameter bore (1a) and the piston rod (2b) acts directly on the striking member (3).
  • the pressurized air is sent in specific arrangements of the body (1) via an input secured for example to a control trigger.
  • the bore (la) of larger diameter is in communication with the orifice (Id) of connection with the compressed air supply circuit and with an exhaust port (Ic).
  • the length (L) of the piston head (2a) and the positioning of the orifices (Ic) and (Id) are determined so that the stroke (C) of the piston is independent of the pressure.
  • This stroke (C) of the piston is determined by the formula:
  • (L) is equal to the length of the piston head, (d) corresponds to the distance traveled by the piston head resulting from its momentum at the time of its ascent,
  • (dl) corresponds to the distance traveled by the piston resulting from its momentum at the moment of its descent. It follows that to make the stroke of the piston independent of pressure, the geometry of the jackhammer must meet the formula stated above with in particular the distance (d) between 0 and 0.25 times the length (L) of the piston head (2a).
  • length (L) of the piston head (2a) 120 mm
  • length (L1) of the piston rod (2b) 240 mm
  • length (L2) of the bore (la) approximately 325 mm
  • length ( L3) of the body (1) approximately 640 mm
  • diameter (D) of the piston head (2a) 70 mm.
  • the compressor comprises a screw block driven by a motor and adapted to admit air to compress it.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The pneumatic tool comprises a body (1) for mounting a piston (2) in a manner that enables it to slide in a sealed manner, said piston being capable of acting upon a striking element (3) mounted at the end of the body. The piston head (2a) slides inside a bore (1a) that communicates with a connecting port (1d) to a circuit for supplying air compressed by a compressor and with a discharge port (1c). The length (L) of the piston head and the positioning of the ports (1c) and (1d) are determined so that the stroke (C) of this piston is independent from the pressure.

Description

OUTIL PNEUMATIQUE PERCUTANT PNEUMATIC TOOL PERCUTANT
L'invention se rattache notamment au secteur technique des outils pneumatiques, notamment des outils percutants du type marteau-piqueur, brise-béton, ...The invention relates in particular to the technical sector of pneumatic tools, including percussion tools hammer-breaker type, concrete breaker, ...
L'invention concerne plus particulièrement les outils pneumatiques dont le principe de fonctionnement est basé sur l'envoi d'air sous pression par l'intermédiaire d'une gâchette, pour commander un piston qui agit, par exemple, sur un organe de frappe.The invention relates more particularly to pneumatic tools whose operating principle is based on the sending of pressurized air by means of a trigger, for controlling a piston which acts, for example, on a striking member.
Selon l'état antérieur de la technique, dans le cadre d'un fonctionnement pneumatique, le marteau-piqueur, brise-béton ou autre, est assujetti à un générateur d'énergie qui comprend, pour l'essentiel, un moteur thermique, un compresseur et un circuit d'huile. La pression nécessaire à un bon fonctionnement est de l'ordre de 6 à 7 bars. Cette pression implique l'utilisation d'un compresseur avec refroidissement, étanchéité et lubrification obtenus par le circuit d'huile. Il apparaît que ce circuit d'huile représente environ 30 % de l'encombrement dans un compresseur.According to the prior art, in the context of pneumatic operation, the jackhammer, concrete breaker or other, is subject to an energy generator which comprises, for the most part, a heat engine, a compressor and an oil circuit. The pressure required for proper operation is of the order of 6 to 7 bars. This pressure involves the use of a compressor with cooling, sealing and lubrication obtained by the oil circuit. It appears that this oil circuit represents about 30% of the space requirement in a compressor.
A partir de cet état de la technique, il est apparu important de pouvoir réduire au maximum le poids de l'ensemble notamment en supprimant le circuit d'huile de refroidissement. Il en résulte toutefois une contrainte majeure à savoir que la pression maximum est limitée dans ce cas à 2 bars environ. Il est donc apparu nécessaire d'adapter le marteau-piqueur ou autres systèmes de frappe, type perforateur, à cette pression étant donné qu'un outil standard fonctionne mal à une telle pression, voire pas du tout. II est nécessaire que l'outil soit adapté à une basse pression, ce qui peut entraîner un débit important, si l'on veut conserver une puissance correcte.From this state of the art, it appeared important to be able to minimize the weight of the assembly including removing the cooling oil circuit. However, this results in a major constraint that the maximum pressure is limited in this case to about 2 bars. It has therefore appeared necessary to adapt the jackhammer or other percussion type striking systems to this pressure since a standard tool malfunctions at such pressure, if at all. It is necessary that the tool is adapted to a low pressure, which can cause a large flow, if one wants to maintain a correct power.
On rappelle ci-après et succinctement, le fonctionnement d'un marteau- piqueur standard.The following is a brief description of the operation of a standard jackhammer.
" En phase 1, lorsque la gâchette est appuyée, l'air alimente la distribution, le piston est au point de frappe. Le volume au-dessus du piston est à l'air libre. L'air fait remonter le piston."In phase 1, when the trigger is pressed, the air feeds the distribution, the piston is at the point of striking, the volume above the piston is in the open air, and the air moves up the piston.
" En phase 2, sous l'effet de l'inertie, le piston remonte et commence à comprimer la chambre haute."In phase 2, under the effect of inertia, the piston rises and begins to compress the upper chamber.
" En phase 3, le volume en dessous du piston est à l'air libre. La chambre haute est en pression."In phase 3, the volume below the piston is in the open air The upper chamber is under pressure.
" En phase 4, l'air provoque la descente du piston par l'intermédiaire de la distribution. " En phase 5, le piston vient frapper sur l'outil. Le volume au- dessus du piston se retrouve à l'air libre, le cycle recommençant selon la phase 1."In phase 4, the air causes the piston to go down through the distribution." In phase 5, the piston hits the tool. The volume above the piston is found in the open air, the cycle starting again according to phase 1.
Il ressort de cette analyse que la course du piston d'un marteau-piqueur standard est fonction de :This analysis shows that the piston stroke of a standard jackhammer is a function of:
" la pression de fonctionnement qui a donné de l'inertie au piston, laquelle inertie va permettre à la tête du piston de dépasser les orifices d'échappement ;the operating pressure which has given the piston inertia, which inertia will allow the piston head to pass the exhaust ports;
" la position des orifices d'échappement ; " la longueur de la tête de piston."the position of the exhaust ports;" the length of the piston head.
A partir de cet état de la technique et pour résoudre le problème posé d'obtenir un fonctionnement avec peu de pression, la longueur de la tête de piston et le positionnement des orifices d'échappement sont déterminés pour que la course dudit piston soit indépendante de la pression. De plus, cette solution peut résoudre le problème des vibrations.From this state of the art and to solve the problem posed to obtain operation with little pressure, the length of the head of piston and the positioning of the exhaust ports are determined so that the stroke of said piston is independent of the pressure. In addition, this solution can solve the problem of vibrations.
Compte tenu du problème posé à résoudre, la course du piston est égale à la somme de la longueur de la tête de piston et de la distance parcourue par ledit piston résultant de son inertie au moment de sa remontée moins la différence entre la distance séparant les orifices d'échappement les plus éloignés et la distance parcourue par ledit piston résultant de son élan au moment de sa descente.Given the problem to solve, the piston stroke is equal to the sum of the length of the piston head and the distance traveled by said piston resulting from its inertia at the time of its ascent less the difference between the distance between the exhaust ports furthest away and the distance traveled by said piston resulting from its momentum at the time of its descent.
Avantageusement, la distance parcourue par le piston résultant de son élan au moment de sa montée est comprise entre 0 et 0,35 fois la longueur de la tête de piston.Advantageously, the distance traveled by the piston resulting from its momentum at the time of its rise is between 0 and 0.35 times the length of the piston head.
Compte tenu des caractéristiques à la base de l'invention, le compresseur fonctionne sans huile en étant apte à délivrer une pression inférieure à 2 bars.Given the basic characteristics of the invention, the compressor operates without oil being able to deliver a pressure of less than 2 bar.
L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels :The invention is described below in more detail with reference to the figures of the accompanying drawings, in which:
- la figure 1 est une vue en coupe d'un exemple de marteau-piqueur ;- Figure 1 is a sectional view of an example of jackhammer;
- les figures 2 et 3 sont des vues à caractère purement schématique illustrant la course de la tête du piston, depuis la position haute (figure 2), jusqu'à la position basse (figure 3) ;- Figures 2 and 3 are purely schematic views illustrating the stroke of the piston head, from the upper position (Figure 2) to the lower position (Figure 3);
On a illustré figure 1, un outil pneumatique du type marteau-piqueur comprenant, d'une manière parfaitement connue pour un homme du métier, un corps (1) délimitant deux alésages coaxiaux de diamètre différent (la) et (Ib) pour le montage avec capacité de coulissement étanche, d'un piston (2) apte à agir sur un organe de frappe (3). La tête (2a) du piston coulisse dans l'alésage de plus grand diamètre (la), la tige (2b) du piston agit directement sur l'organe de frappe (3).FIG. 1 shows a jackhammer type pneumatic tool comprising, in a manner perfectly known to those skilled in the art, a body (1) delimiting two coaxial bores of different diameter (la) and (Ib) for mounting with sealing ability, a piston (2) adapted to act on a striking member (3). The piston head (2a) slides in the larger diameter bore (1a) and the piston rod (2b) acts directly on the striking member (3).
L'air sous pression est envoyé dans des agencements spécifiques du corps (1) par l'intermédiaire d'une entrée assujettie par exemple à une gâchette de commande. L'alésage (la) de plus grand diamètre est en communication avec l'orifice (Id) de liaison avec le circuit d'alimentation d'air comprimé et avec un orifice d'échappement (Ic).The pressurized air is sent in specific arrangements of the body (1) via an input secured for example to a control trigger. The bore (la) of larger diameter is in communication with the orifice (Id) of connection with the compressed air supply circuit and with an exhaust port (Ic).
Selon l'invention, la longueur (L) de la tête de piston (2a) et le positionnement des orifices (Ic) et (Id) sont déterminés pour que la course (C) du piston soit indépendante de la pression. Cette course (C) du piston est déterminée par la formule :According to the invention, the length (L) of the piston head (2a) and the positioning of the orifices (Ic) and (Id) are determined so that the stroke (C) of the piston is independent of the pressure. This stroke (C) of the piston is determined by the formula:
C = L + d - (E-dl) Formule dans laquelle : (C) est égal à la course du piston,C = L + d - (E-dl) Formula in which: (C) is equal to the stroke of the piston,
(L) est égal à la longueur de la tête du piston, (d) correspond à la distance parcourue par la tête du piston résultant de son élan au moment de sa remontée,(L) is equal to the length of the piston head, (d) corresponds to the distance traveled by the piston head resulting from its momentum at the time of its ascent,
(E) correspond à la distance séparant les orifices les plus éloignés (Ic) et (Id),(E) corresponds to the distance separating the furthest orifices (Ic) and (Id),
(dl) correspond à la distance parcourue par le piston résultant de son élan au moment de sa descente. II en résulte que pour rendre la course du piston indépendante de la pression, la géométrie du marteau-piqueur doit répondre à la formule énoncée précédemment avec notamment la distance (d) comprise entre 0 et 0,25 fois la longueur (L) de la tête de piston (2a).(dl) corresponds to the distance traveled by the piston resulting from its momentum at the moment of its descent. It follows that to make the stroke of the piston independent of pressure, the geometry of the jackhammer must meet the formula stated above with in particular the distance (d) between 0 and 0.25 times the length (L) of the piston head (2a).
On donne ci-après à titre indicatif nullement limitatif des caractéristiques dimensionnelles d'un marteau-piqueur selon l'invention lui permettant de fonctionner avec une pression minimum de 0,2 bar environ :The following is indicative, in no way limiting, of the dimensional characteristics of a jackhammer according to the invention enabling it to operate with a minimum pressure of approximately 0.2 bar:
longueur (L) de la tête de piston (2a) = 120 mm, longueur (Ll) de la tige de piston (2b) = 240 mm, longueur (L2) de l'alésage (la) = 325 mm environ, longueur (L3) du corps (1) = 640 mm environ, diamètre (D) de la tête de piston (2a) = 70 mm.length (L) of the piston head (2a) = 120 mm, length (L1) of the piston rod (2b) = 240 mm, length (L2) of the bore (la) = approximately 325 mm, length ( L3) of the body (1) = approximately 640 mm, diameter (D) of the piston head (2a) = 70 mm.
On renvoie au tableau comparatif relatif à des tests d'écrasement (puissance) entre un marteau-piqueur standard (colonne A) et un marteau- piqueur selon les caractéristiques de l'invention (colonnes B, C, D et E).Reference is made to the comparative table relating to crushing tests (power) between a standard jackhammer (column A) and a jackhammer according to the characteristics of the invention (columns B, C, D and E).
Figure imgf000007_0001
Notamment et d'une manière particulièrement importante, il ressort de ce tableau qu'avec un marteau-piqueur selon l'invention, sous une pression de 2 bars, on a enregistré des résultats équivalents, voire supérieurs, à ceux obtenus avec un marteau-piqueur classique sous une pression de 6,5 bars.
Figure imgf000007_0001
In particular and particularly importantly, it is clear from this table that with a jackhammer according to the invention, under a pressure of 2 bars, results equivalent to or greater than those obtained with a hammer were recorded. conventional breaker at a pressure of 6.5 bars.
Compte tenu des caractéristiques à la base de l'invention, il apparaît le fonctionnement suivant :Given the basic characteristics of the invention, it appears the following operation:
A la descente, la frappe du piston (2) sur l'organe (3) intervient peu après que la tête du piston (2a) ait dépassé l'orifice le plus haut (Id) (figure 3) ce qui permet d'avoir toute l'énergie du piston pour la frappe. A noter que, dans certains cas, la frappe intervient plus tard, par exemple. La zone de battue du pic au niveau du décaleur peut être plus importante pour éviter une casse de matériel. Il en résulte que la distance (dl) n'est pas significative pour le fonctionnement du marteau. On observe également que le volume, de part et d'autre de la tête du piston (2a), n'entre pas directement en compte dans le fonctionnement de l'ensemble du marteau- piqueur.At the descent, the striking of the piston (2) on the member (3) occurs shortly after the piston head (2a) has passed the highest orifice (Id) (FIG. 3), which makes it possible to have all the energy of the piston for striking. Note that in some cases, typing occurs later, for example. The beat zone of the peak at the level of the shifter can be greater to avoid a breakage of material. As a result, the distance (dl) is not significant for the operation of the hammer. It is also observed that the volume, on either side of the piston head (2a), does not directly take into account the operation of the whole jackhammer.
Les avantages ressortent bien de la description, en particulier on souligne et on rappelle :The advantages stand out well from the description, in particular one underlines and recalls:
" la possibilité de limiter le recul du marteau-piqueur, étant donné qu'il n'y a pas de contre-pression sur le piston, lorsque la distribution bascule, diminuant, d'une manière significative, les vibrations ; " la possibilité de régler la pression en fonction par exemple de l'état du terrain (terrain meuble pression élevée, terrain dur pression faible), le fait de baisser la pression réduisant les vibrations ;"the possibility of limiting the retreat of the jackhammer, since there is no back pressure on the piston, when the distribution tilts, decreasing, significantly, the vibrations; "the possibility of adjusting the pressure depending eg on the state of the ground (soft ground high pressure, hard ground low pressure), lowering the pressure reducing vibrations;
" la possibilité d'adapter les caractéristiques de l'invention au système de frappe (perforateur, piqueur, ...) ;"the possibility of adapting the features of the invention to the striking system (perforator, breaker, ...);
" la possibilité d'utiliser un compresseur sans huile à basse pression (inférieure ou égale à 2 bars environ)."the possibility of using a compressor without oil at low pressure (less than or equal to about 2 bars).
Avantageusement, le compresseur comprend un bloc vis entraîné par un moteur et apte à admettre de l'air pour le comprimer. Advantageously, the compressor comprises a screw block driven by a motor and adapted to admit air to compress it.

Claims

R E V E N D I C A T I O N SR E V E N D I C A T IO N S
-1- Outil pneumatique comprenant un corps (1) pour le montage avec capacité de coulissement étanche d'un piston (2) apte à agir sur un organe de frappe (3) monté en bout du corps, la tête de piston (2a) coulissant dans un alésage (la) qui est en communication avec un orifice de liaison (Id) avec un circuit d'alimentation en air comprimé au moyen d'un compresseur et avec un orifice d'échappement (Ic), caractérisé en ce que la longueur (L) de la tête de piston et le positionnement des orifices (Ic) et (Id) sont déterminés pour que la course (C) dudit piston soit indépendante de la pression.-1- Pneumatic tool comprising a body (1) for mounting with sealing ability of a piston (2) adapted to act on a striking member (3) mounted at the end of the body, the piston head (2a) slidable in a bore (1a) which is in communication with a connection port (Id) with a compressed air supply circuit by means of a compressor and with an exhaust port (Ic), characterized in that the length (L) of the piston head and the positioning of the orifices (Ic) and (Id) are determined so that the stroke (C) of said piston is independent of the pressure.
-2- Outil selon la revendication 1, caractérisé en ce que la course (C) du piston (2a) est égale à la somme de la longueur (L) de la tête de piston et de la distance (d) parcourue par ledit piston résultant de son élan au moment de sa remontée moins la différence entre la distance (E) séparant les orifices (Ic) et (Id) les plus éloignés et la distance (dl) parcourue par ledit piston résultant de son élan au moment de sa descente.-2- Tool according to claim 1, characterized in that the stroke (C) of the piston (2a) is equal to the sum of the length (L) of the piston head and the distance (d) traveled by said piston resulting from its momentum at the time of its ascent minus the difference between the distance (E) separating the orifices (Ic) and (Id) furthest away and the distance (dl) traveled by said piston resulting from its momentum at the moment of its descent .
-3- Outil selon la revendication 2, caractérisé en ce que la distance (d) parcourue par le piston résultant de son élan au moment de sa remontée est comprise entre 0 et 0,25 fois la longueur (L) de la tête de piston (2a).-3- Tool according to claim 2, characterized in that the distance (d) traveled by the piston resulting from its momentum at the time of its ascent is between 0 and 0.25 times the length (L) of the piston head (2a).
-4- Outil selon la revendication 1, caractérisé en ce que le compresseur fonctionne sans huile en étant apte à délivrer une pression minimum de 0,2 bars. -5- Outil selon la revendication 4, caractérisé en ce que le compresseur comprend un bloc vis entraîné par un moteur et apte à admettre de l'air pour le comprimer. -4- Tool according to claim 1, characterized in that the compressor operates without oil being able to deliver a minimum pressure of 0.2 bar. -5- Tool according to claim 4, characterized in that the compressor comprises a screw block driven by a motor and adapted to admit air to compress it.
PCT/FR2006/050374 2005-05-02 2006-04-24 Percussive pneumatic tool WO2006117490A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06743831A EP1883506A1 (en) 2005-05-02 2006-04-24 Percussive pneumatic tool

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FR0551149A FR2885064B1 (en) 2005-05-02 2005-05-02 PNEUMATIC TOOL PERCUTANT
FR0551149 2005-05-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2915123A1 (en) * 2007-04-18 2008-10-24 Sullair Europ Sarl Pneumatic tool and compressor system, has percussion hammer operated at pressure in gaseous fluid admitting and exhausting circuits and distribution device relative to hammer for providing useful work at level of high pressure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191300772A (en) * 1913-01-10 1913-03-27 George Henry Rayner Improvements relating to Rock Drills.
FR2154023A5 (en) * 1971-09-15 1973-05-04 Inst Gornogo Dela Sibirskogo O
US4194435A (en) * 1976-07-07 1980-03-25 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Percussion mechanism
FR2443903A1 (en) * 1978-12-11 1980-07-11 Inst Mekhanizirovannogo I Ruch Portable, pneumatic percussive tool - has tubular type slide valve connecting air supply channels to return and work chambers
BE1014892A5 (en) * 1998-09-17 2004-06-01 Hitachi Ltd Screw compressor oil free.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191300772A (en) * 1913-01-10 1913-03-27 George Henry Rayner Improvements relating to Rock Drills.
FR2154023A5 (en) * 1971-09-15 1973-05-04 Inst Gornogo Dela Sibirskogo O
US4194435A (en) * 1976-07-07 1980-03-25 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Percussion mechanism
FR2443903A1 (en) * 1978-12-11 1980-07-11 Inst Mekhanizirovannogo I Ruch Portable, pneumatic percussive tool - has tubular type slide valve connecting air supply channels to return and work chambers
BE1014892A5 (en) * 1998-09-17 2004-06-01 Hitachi Ltd Screw compressor oil free.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2915123A1 (en) * 2007-04-18 2008-10-24 Sullair Europ Sarl Pneumatic tool and compressor system, has percussion hammer operated at pressure in gaseous fluid admitting and exhausting circuits and distribution device relative to hammer for providing useful work at level of high pressure

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FR2885064B1 (en) 2009-01-30
EP1883506A1 (en) 2008-02-06

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