EP0019568B1 - Silencer for pneumatic hammer - Google Patents
Silencer for pneumatic hammer Download PDFInfo
- Publication number
- EP0019568B1 EP0019568B1 EP80420060A EP80420060A EP0019568B1 EP 0019568 B1 EP0019568 B1 EP 0019568B1 EP 80420060 A EP80420060 A EP 80420060A EP 80420060 A EP80420060 A EP 80420060A EP 0019568 B1 EP0019568 B1 EP 0019568B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- casing
- rigidly fixed
- flange
- silencer
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
- F01N1/20—Silencing apparatus characterised by method of silencing by using movable parts having oscillating or vibrating movement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/11—Arrangements of noise-damping means
- B25D17/12—Arrangements of noise-damping means of exhaust silencers
Definitions
- the present invention relates to a silencer for pneumatic hammer, therefore a device attenuating the noise of the exhaust of air, this in the field of pneumatic percussion devices.
- a pneumatic hammer is a device essentially composed of a cylindrical body having a bore inside which is slidably mounted a piston animated by a reciprocating movement, said piston striking a tool such as a pick or chisel to the end of its downhill run.
- a valve system generally distributes the compressed air alternately in the upper chamber and the lower chamber of the cylinder, thus causing the movement of the piston.
- a known solution which is extremely effective consists in carrying out the expansion of the compressed air in an almost closed annular enclosure, formed around the cylinder of the device.
- Such an enclosure is formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, and it has a sufficient volume to receive the air content of each chamber of the device without the final pressure, in said enclosure is substantially higher than atmospheric pressure.
- the air, expanded to a pressure much lower than 1 bar, can then escape from the enclosure at a speed lower than the speed of sound through a duct of reduced section, and this by using all of the duration of the complete cycle of the device (See, for example DE-A-2 349 296).
- the present invention aims to eliminate all the shortcomings of current solutions, its aim being thus to avoid the formation of frost in the exhaust channel to the atmosphere without this leading to other drawbacks.
- the subject of the invention is a silencer for an air hammer, of the kind comprising an annular enclosure where the ar escaping from the cylinder of the apparatus is previously relaxed, before being evacuated to the atmosphere. through a narrow passage, said enclosure being formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, silent in which, according to the essential characteristic of the invention, said envelope has its apex integral with a sleeve mounted to slide axially on the upper part of the cylinder, while the lower part of said envelope is tightened so as to delimit the passage of small width and of annular shape around the external wall of the cylinder, the assembly formed by the envelope and the sleeve being suspended elastically from the cylinder.
- the invention allows the use of an effective expansion chamber without the disadvantage of freezing. Indeed, during the operation of the apparatus, the alternating direction reaction forces and the inertia cause a relative displacement between, on the one hand, the cylinder and, on the other hand, the sleeve integral with the envelope, and this displacement generates, at the level of the passage formed between the external wall of the cylinder and the lower edge of the envelope, a continuous abrasion of the frost in formation.
- the pneumatic hammer shown in the drawing in longitudinal section, comprises in a known manner a cylinder 1 in the bore 2 of which a piston 3 is slidably mounted.
- the latter strikes a peak 4 which crosses a closure part 5, closing off the cylinder 1 at its lower part.
- a conventional valve distribution system causes the admission of compressed air alternately into the cylindrical chamber 6, located above the piston 3, and into the annular chamber 7, located below the piston 3.
- the latter has a "stepped" shape, and the lateral surface 8 of its portion of larger diameter masks or uncovers, depending on the position of the piston 3, exhaust ports 9 formed radially in the cylinder 1 and opening out, with a part, in the bore 2, on the other hand, in an annular enclosure 10 surrounding the cylinder 1.
- the aforementioned enclosure 10 is delimited, externally, by an envelope 11 of generally annular shape, the top of which is integral with a sleeve 12 mounted to slide axially around the upper part of the cylinder 1.
- the envelope 11, for example made of elastomer, can be fixed to the sleeve 12 by means of a clamp 13.
- the upper part of the cylinder 1, closed by a cover 14, carries a cylinder head 15 provided with the handle or handles of the device and having a skirt partially surrounding the sleeve 12.
- the parts located opposite belonging to the sleeve 12 and to the skirt of the cylinder head 15, define with two rings 16 and 17 an annular space, in which is housed and compressed a spring 18, the two ends of which bear on flat rings, respectively 19 and 20
- the spring 18 thus mounted constitutes an elastic suspension of low stiffness, acting in both directions, for the assembly formed by the casing 11 and the sleeve 12.
- the envelope 11 is tightened so as to provide, between the outer wall of the cylinder 1 and the lower edge of said envelope 11, an annular passage 21 of small width d over the entire perimeter of the device.
- the compressed air escaping from the upper chamber 6 or from the lower chamber 7, through the ports 9, is previously expanded in the annular enclosure 10, delimited by the external wall of the cylinder 1 and the inner wall of the envelope 11. Then this air is evacuated into the atmosphere through the annular passage 21, which constitutes an exhaust duct of determined section and of small width suitable for maximum attenuation of the exhaust noise .
- the cylinder 1, subjected to the alternating reactions of the forces developed by the compressed air on the piston 3, moves at the striking frequency of the hammer.
- the sliding sleeve, on the envelope is also integral with the cylinder head provided with the handle (s) of the device, so that it is the envelope-sleeve assembly which is suspended relative to the air hammer cylinder, unlike the example described where the cylinder head is rigidly linked to the cylinder.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Percussive Tools And Related Accessories (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Electrostatic Separation (AREA)
- Earth Drilling (AREA)
- Surgical Instruments (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
La présente invention se rapporte à un silencieux pour marteau pneumatique, donc un dispositif atténuant le bruit de l'échappement de l'air, ceci dans le domaine des appareils pneumatiques à percussions.The present invention relates to a silencer for pneumatic hammer, therefore a device attenuating the noise of the exhaust of air, this in the field of pneumatic percussion devices.
Il est rappelé qu'un marteau pneumatique est un appareil essentiellement composé d'un corps cylindrique comportant un alésage à l'intérieur duquel est monté coulissant un piston animé d'un mouvement alternatif, ledit piston venant percuter un outil tel que pic ou pointerolle à la fin de sa course de descente. Un système à valve assure généralement la distribution de l'air comprimé alternativement dans la chambre supérieure et la chambre inférieure du cylindre, entraînant ainsi le mouvement du piston.It is recalled that a pneumatic hammer is a device essentially composed of a cylindrical body having a bore inside which is slidably mounted a piston animated by a reciprocating movement, said piston striking a tool such as a pick or chisel to the end of its downhill run. A valve system generally distributes the compressed air alternately in the upper chamber and the lower chamber of the cylinder, thus causing the movement of the piston.
Des considérations de nature thermodynamique conduisent les constructeurs à prévoir un échappement de ces deux chambres dans l'atmosphère, le rendement de l'appareil étant maximal pour une vidange aussi rapide et complète que possible à l'approche de chaque fin de course de montée ou de descente du piston. Le moyen le plus simple et le plus efficace pour parvenir à ce résultat consiste à donner au piston un rôle de distributeur, en ce sens que la surface latérale dudit piston masque ou découvre une ou plusieurs lumières d'échappement pratiquées dans le cylindre en une position judicieuse. Ce moyen assure une ouverture de l'échappement à grande vitesse. Cependant la détente brusque dans l'atmosphère de quelques décimètres cubes d'air comprimé à plusieurs bars, donc s'échappant à la vitesse du son pour exploser ensuite, en quelques millièmes de seconde, et cela environ 1000 fois par minute, crée une succession d'ondes sonores de très haut niveau de puissance acoustique, dangereuses pour l'oreille de l'utilisateur, et de toute personne se trouvant à proximité de l'appareil.Considerations of a thermodynamic nature lead manufacturers to provide for an escape of these two chambers into the atmosphere, the efficiency of the device being maximum for emptying as quickly and completely as possible when approaching each end of climb or piston lowering. The simplest and most effective way to achieve this result is to give the piston a role of distributor, in the sense that the lateral surface of said piston masks or uncovers one or more exhaust ports in the cylinder in one position. judicious. This means ensures an opening of the exhaust at high speed. However, the sudden relaxation in the atmosphere of a few cubic decimeters of compressed air at several bars, therefore escaping at the speed of sound and then exploding, in a few thousandths of a second, and that about 1000 times per minute, creates a succession sound waves of very high sound power level, dangerous for the ear of the user, and of anyone near the device.
Les constructeurs de marteaux pneumatiques sont actuellement très soucieux d'abaisser le niveau sonore de l'échappement. Une solution connue extrêmement efficace consiste à effectuer la détente de l'air comprimé dans une enceinte annulaire presque close, formée autour du cylindre de l'appareil. Une telle enceinte est formée entre la paroi extérieure du cylindre et la paroi intérieure d'une enveloppe entourant le cylindre, et elle possède un volume suffisant pour recevoir le contenu d'air de chaque chambre de l'appareil sans que la pression finale, dans ladite enceinte, soit sensiblement supérieure à la pression atmosphérique. L'air, détendu à une pression fortement inférieure à 1 bar, peut alors s'échapper de l'enceinte à une vitesse inférieure à la vitesse du son au travers d'un conduit de section réduite, et cela en utilisant la totalité de la durée du cycle complet de l'appareil (Voir, par exemple DE-A-2 349 296).Pneumatic hammer manufacturers are currently very concerned with lowering the noise level of the exhaust. A known solution which is extremely effective consists in carrying out the expansion of the compressed air in an almost closed annular enclosure, formed around the cylinder of the device. Such an enclosure is formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, and it has a sufficient volume to receive the air content of each chamber of the device without the final pressure, in said enclosure is substantially higher than atmospheric pressure. The air, expanded to a pressure much lower than 1 bar, can then escape from the enclosure at a speed lower than the speed of sound through a duct of reduced section, and this by using all of the duration of the complete cycle of the device (See, for example DE-A-2 349 296).
Cette solution, fréquemment utilisée, présente un grave inconvénient. En effet, l'efficacité du système d'échappement précédemment rappelé dépend essentiellement de la forme et de la surface du conduit permettant à l'air préalablement détendu de s'échapper dans l'atmosphère. La surface du conduit considéré doit être assez faible pour assurer un écoulement quasi-permanent, et non pulsé, tandis que la forme de ce conduit doit être telle que les parois soient aussi rapprochées que possible, cette disposition produisant le minimum de bruit. Or la détente de l'air comprimé, depuis la chambre supérieure ou inférieure du cylindre jusqu'à l'atmosphère, s'accompagne toujours d'une forte baisse de température de cet air. La température finale de l'air détendu est variable, en fonction de la température ambiante, mais elle se situe fréquemment au-dessous de 0°C. L'eau, qui est toujours présente en certaine quantité dans l'air, se transforme alors en givre qui vient obstruer les conduits d'évacuation, et ceci d'autant plus rapidement que ces conduits sont de faible surface et surtout de faible largeur.This frequently used solution has a serious drawback. Indeed, the efficiency of the previously mentioned exhaust system essentially depends on the shape and the surface of the duct allowing the previously relaxed air to escape into the atmosphere. The surface of the duct considered must be small enough to ensure a quasi-permanent flow, and not pulsed, while the shape of this duct must be such that the walls are as close together as possible, this arrangement producing the minimum noise. Now, the expansion of the compressed air, from the upper or lower chamber of the cylinder to the atmosphere, is always accompanied by a sharp drop in the temperature of this air. The final temperature of the expanded air is variable, depending on the ambient temperature, but it is frequently below 0 ° C. The water, which is always present in certain quantity in the air, is then transformed into frost which comes to obstruct the evacuation conduits, and this all the more quickly as these conduits are of small surface and especially of small width.
les seuls remèdes actuellement connus à cet inconvénient consistent soit à élargir les conduits, ce qui entraîne une augmentation du bruit, évidemment contraire au résultat principal recherché, soit à employer des produits antigel en ';omp!ément à l'air comprimé, et parfois à utiliser les deux précédents remèdes en combinaison; dans tous les cas, il s'agit de solutions contraignantes, sur le plan tant pratique qu'économique.the only remedies currently known for this drawback consist either in widening the conduits, which leads to an increase in noise, obviously contrary to the main desired result, or in using antifreeze products ; omp! ement with compressed air, and sometimes to use the two previous remedies in combination; in all cases, these are binding solutions, both practical and economic.
La présente invention vise, à éliminer tous les défauts des solutions actuelles, son but étant ainsi d'éviter la formation de givre dans le canal d'échappement à l'atmosphère sans que cela entraîne d'autres inconvénients.The present invention aims to eliminate all the shortcomings of current solutions, its aim being thus to avoid the formation of frost in the exhaust channel to the atmosphere without this leading to other drawbacks.
A cet effet, l'invention a pour objet un silencieux pour marteau pneumatique, du genre de ceux comprenant une enceinte annulaire où l'ar s'échappant du cylindre de l'appareil est préalablement détendu, avant d'être évacué à l'atmosphère au travers d'un passage de faible largeur, ladite enceinte étant formée entre la paroi extérieure du cylindre et la paroi intérieure d'une enveloppe entourant le cylindre, silencieux dans lequel, selon la caractéristique essentielle de l'invention, ladite enveloppe a son sommet solidaire d'un manchon monté coulissant axialement sur la partie supérieure du cylindre, tandis que la partie inférieure de ladite enveloppe est resserrée de manière à délimiter le passage de faible largeur et de forme annulaire autour de la paroi extérieure du cylindre, l'ensemble formé par l'enveloppe et le manchon étant suspendu élastiquement au cylindre.To this end, the subject of the invention is a silencer for an air hammer, of the kind comprising an annular enclosure where the ar escaping from the cylinder of the apparatus is previously relaxed, before being evacuated to the atmosphere. through a narrow passage, said enclosure being formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, silent in which, according to the essential characteristic of the invention, said envelope has its apex integral with a sleeve mounted to slide axially on the upper part of the cylinder, while the lower part of said envelope is tightened so as to delimit the passage of small width and of annular shape around the external wall of the cylinder, the assembly formed by the envelope and the sleeve being suspended elastically from the cylinder.
En prévoyant ainsi que l'enveloppe délimitant l'enceinte de détente est solidaire d'un manchon coulissant, suspendu élastiquement au cylindre du marteau pneumatique, ce qui est réalisable par l'intermédiaire d'au moins un ressort ou d'un dispositif à air comprimé, l'invention permet l'utilisation d'une enceinte de détente efficace sans inconvénient de gel. En effet, durant le fonctionnement de l'appareil, les forces de réaction de sens alterné et l'inertie provoquent un déplacement relatif entre, d'une part, le cylindre et, d'autre part, le manchon solidaire de l'enveloppe, et ce déplacement engendre, au niveau du passage ménagé entre la paroi extérieure du cylindre et le bord inférieur de l'enveloppe, une abrasion continue du givre en formation.By thus providing that the envelope delimiting the expansion enclosure is integral with a sliding sleeve, elastically suspended from the cylinder of the pneumatic hammer, which is achievable by means of at least one spring or of a compressed air device, the invention allows the use of an effective expansion chamber without the disadvantage of freezing. Indeed, during the operation of the apparatus, the alternating direction reaction forces and the inertia cause a relative displacement between, on the one hand, the cylinder and, on the other hand, the sleeve integral with the envelope, and this displacement generates, at the level of the passage formed between the external wall of the cylinder and the lower edge of the envelope, a continuous abrasion of the frost in formation.
De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence à l'unique figure du dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme de réalisation d'un marteau pneumatique équipé d'un silencieux conforme à l'invention.In any case, the invention will be better understood with the aid of the description which follows, with reference to the single figure of the appended schematic drawing representing, by way of nonlimiting example, an embodiment of a pneumatic hammer equipped with a silencer according to the invention.
Le marteau pneumatique, représenté sur le dessin en coupe longitudinale, comprend de façon connue un cylindre 1 dans l'alésage 2 duquel est monté coulissant un piston 3. Ce dernier vient frapper un pic 4 qui traverse une pièce de fermeture 5, obturant le cylindre 1 à sa partie inférieure. Un système classique de distribution à valve, non représenté, provoque l'admission de l'air comprimé alternativement dans la chambre cylinJrique 6, située au-dessus du piston 3, et dans la chambre annulaire 7, située au-dessous du piston 3. Ce dernier présente une forme »étagée«, et la surface latérale 8 de sa partie de plus grand diamètre masque ou découvre, selon la position du piston 3, des lumières d'échappement 9 pratiquées radialement dans le cylindre 1 et débouchant, d'une part, dans l'alésage 2, d'autre part, dans une enceinte annulaire 10 entourant le cylindre 1.The pneumatic hammer, shown in the drawing in longitudinal section, comprises in a known manner a cylinder 1 in the bore 2 of which a
L'enceinte 10 précitée est délimitée, extérieurement, par une enveloppe 11 de forme générale annulaire, dont le sommet est solidaire d'un manchon 12 monté coulissant axialement autour de la partie supérieure du cylindre 1. L'enveloppe 11, par exemple réalisée en élastomère, peut être fixée au manchon 12 au moyen d'un collier de serrage 13.The
Dans l'exemple de réalisation représenté, la partie supérieure du cylindre 1, obturée par un couvercle 14, porte une culasse 15 munie de la ou des poignées de l'appareil et possédant une jupe entourant partiellement le manchon 12. Les parties situées en regard, appartenant au manchon 12 et à la jupe de la culasse 15, délimitent avec deux bagues 16 et 17 un espace annulaire, dans lequel est logé et comprimé un ressort 18, dont les deux extrémités prennent appui sur des anneaux plats, respectivement 19 et 20. Le ressort 18 ainsi monté constitue une suspension élastique de faible raideur, agissant dans les deux sens, pour l'ensemble formé par l'enveloppe 11 et le manchon 12.In the embodiment shown, the upper part of the cylinder 1, closed by a
Dans sa partie inférieure, l'enveloppe 11 se resserre de manière à ménager, entre la paroi extérieure du cylindre 1 et le bord inférieur de ladite enveloppe 11, un passage annulaire 21 de faible largeur d sur tout le périmètre de l'appareil.In its lower part, the
Pendant le fonctionnement du marteau pneumatique, l'air comprimé s'échappant de la chambre supérieure 6 ou de la chambre inférieure 7, par les lumières 9, est préalablement détendu dans l'enceinte annulaire 10, délimitée par la paroi extérieure du cylindre 1 et la paroi intérieure de l'enveloppe 11. Ensuite cet air est évacué dans l'atmosphère à travers le passage annulaire 21, qui constitue un conduit d'échappement de section déterminée et de faible largeur d propice à une atténuation maximale du bruit d'échappement. Durant ce fonctionnement, le cylindre 1, soumis aux réactions alternées des forces développées par l'air comprimé sur le piston 3, se déplace à la fréquence de frappe du marteau. Il en résulte, grâce à la suspension élastique précédemment indiquée entre la culasse 15 et le manchon 12, et en raison de l'inertie de l'ensemble constitué par l'enveloppe 11 et le manchon 12, un déplacement relatif du cy!indre 1 et de l'enveloppe 11, se traduisant notamment par un mouvement relatif des parois situées en vis-à-vis qui délimitent le passage 21, mouvement entraînant une abrasion régulière du givre en formation à cet endroit. Cet effet d'abrasion peut être accentué par le faible mouvement latéral que l'utilisateur donne à l'enveloppe 11 en élastomère, lors de l'emploi de l'appareil sous différents angles d'inclinaison avec appui latéral. Le passage 21 reste ainsi constamment dégagé, permettant l'utilisation d'une enceinte de détente 10 efficace sans inconvénient de gel.During the operation of the pneumatic hammer, the compressed air escaping from the
Comme il va de soi, l'invention ne se limite pas à la seule forme de réalisation qui a été décrite ci-dessus, à titre d'exemple; elle en embrasse, au contraire, toutes les variantes fondées sur le même principe.It goes without saying that the invention is not limited to the single embodiment which has been described above, by way of example; on the contrary, it embraces all variants based on the same principle.
C'est ainsi, notamment, que l'on ne s'éloignerait pas du cadre de l'invention en remplaçant la suspension mécanique à ressort de l'enveloppe délimitant extérieurement l'enceinte de détente par une suspension pneumatique réalisée en utilisant l'alimentation en air comprimé qui est de toute façon disponible sur l'appareil. On peut aussi prévoir que le manchon coulissant, soiidaire de l'enveloppe, est aussi solidaire de la culasse munie de la ou des poignées de l'appareil, de sorte que c'est l'ensemble enveloppe-manchonculasse qui est suspendu par rapport au cylindre du marteau pneumatique, contrairement à l'exemple décrit où la culasse est rigidement liée au cylindre.Thus, in particular, that one would not depart from the scope of the invention by replacing the mechanical spring suspension of the envelope externally delimiting the expansion enclosure by an air suspension produced using the power supply compressed air which is available on the device anyway. It is also possible to provide that the sliding sleeve, on the envelope, is also integral with the cylinder head provided with the handle (s) of the device, so that it is the envelope-sleeve assembly which is suspended relative to the air hammer cylinder, unlike the example described where the cylinder head is rigidly linked to the cylinder.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80420060T ATE691T1 (en) | 1979-05-22 | 1980-05-13 | SILENCER FOR AIR HAMMER. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7913912A FR2457152A1 (en) | 1979-05-22 | 1979-05-22 | PNEUMATIC HAMMER MUFFLER |
| FR7913912 | 1979-05-22 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0019568A1 EP0019568A1 (en) | 1980-11-26 |
| EP0019568B1 true EP0019568B1 (en) | 1982-02-17 |
| EP0019568B2 EP0019568B2 (en) | 1986-01-15 |
Family
ID=9226058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80420060A Expired EP0019568B2 (en) | 1979-05-22 | 1980-05-13 | Silencer for pneumatic hammer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4558763A (en) |
| EP (1) | EP0019568B2 (en) |
| AT (1) | ATE691T1 (en) |
| DE (1) | DE3060201D1 (en) |
| ES (1) | ES8101444A1 (en) |
| FR (1) | FR2457152A1 (en) |
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| SE432375B (en) * | 1982-09-16 | 1984-04-02 | Atlas Copco Ab | DEVICE FOR SILENCE FOR PRESSURE AIR DRIVES |
| US4879847A (en) * | 1989-03-13 | 1989-11-14 | Snap-On Tools Corporation | Cover for pneumatic tool |
| DE4110261A1 (en) * | 1991-03-28 | 1992-10-01 | Krupp Maschinentechnik | SOUND INSULATION DEVICE ON A HAND-GUIDED, FLUID-DRIVEN IMPACT OR DRILLING TOOL |
| US5259462A (en) * | 1992-08-28 | 1993-11-09 | Ingersoll-Rand Company | Soft mount air distributor |
| US5418339A (en) * | 1993-11-04 | 1995-05-23 | Minnesota Mining And Manufacturing Company | Pneumatic tool having noise reducing muffling structure |
| WO2000076731A1 (en) * | 1999-06-10 | 2000-12-21 | Macdonald Air Tools Limited | Pneumatic tool |
| US6547015B1 (en) | 2001-03-29 | 2003-04-15 | Snap-On Technologies, Inc. | Elongated pneumatic tool with replaceable soft grip |
| US6932166B1 (en) | 2002-12-03 | 2005-08-23 | Paul Kirsch | Pneumatic tool |
| US7478096B2 (en) * | 2003-02-26 | 2009-01-13 | Burnside Acquisition, Llc | History preservation in a computer storage system |
| US7261181B2 (en) * | 2004-06-03 | 2007-08-28 | Caterpillar Inc. | Detatchable muffler apparatus for pneumatic tools |
| DE102004031628A1 (en) * | 2004-06-30 | 2006-02-02 | Robert Bosch Gmbh | Device with an inner shell and an outer shell of a housing of a hand tool |
| TWM268150U (en) * | 2004-08-17 | 2005-06-21 | Guo-Rung Liu | Impact cylinder for reciprocal type pneumatic tool |
| US7681690B2 (en) * | 2007-07-13 | 2010-03-23 | Longyear Tm, Inc. | Noise abatement device for a pneumatic tool |
| US8196674B2 (en) * | 2008-03-05 | 2012-06-12 | Makita Corporation | Impact tool |
| US7735603B2 (en) * | 2008-05-28 | 2010-06-15 | Longyear Tm, Inc. | Noise reducing device for a pneumatic tool |
| US8215449B2 (en) * | 2009-12-02 | 2012-07-10 | Longyear Tm, Inc. | Muffler system for noise abatement and ice control |
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| US1644030A (en) * | 1926-08-04 | 1927-10-04 | Ingersoll Rand Co | Handle for rock drills |
| US2058583A (en) * | 1935-12-23 | 1936-10-27 | Independent Pneumatic Tool Co | Cushioned handle for tools |
| US2830560A (en) * | 1955-10-05 | 1958-04-15 | Doeden Tool Corp | Air-operated hand tool |
| US2899934A (en) * | 1956-01-19 | 1959-08-18 | salengro | |
| FR1353634A (en) * | 1963-01-18 | 1964-02-28 | Meudon Forges Atel | anti-noise equipment for pneumatic hammer |
| BE649108A (en) * | 1963-06-10 | |||
| FR1416101A (en) * | 1964-11-19 | 1965-10-29 | Cons Mining & Smelting Co | Silencers for impactful pneumatic tools |
| US3526293A (en) * | 1968-06-13 | 1970-09-01 | Gardner Denver Co | Muffler for fluid actuated tool |
| US3554316A (en) * | 1969-11-25 | 1971-01-12 | Chicago Pneumatic Tool Co | Detachable elastomer muffler for pneumatic percussive tools |
| SU482286A1 (en) * | 1972-10-03 | 1975-08-30 | Институт Горного Дела Ан Ссср | Pneumatic breaker |
| US3809179A (en) * | 1973-04-18 | 1974-05-07 | Dresser Ind | Exhaust muffler for pneumatic tools |
| FR2282974A1 (en) * | 1974-08-29 | 1976-03-26 | Baud Barthelemy | Pleated anti-noise skirt for pneumatic drill - has basically pleated open tube enveloping lower drill body and bit |
| US4079809A (en) * | 1977-07-13 | 1978-03-21 | The United States Of America As Represented By The Secretary Of The Interior | Muffler for pneumatic drill |
| DE2827279C2 (en) * | 1978-06-21 | 1986-06-12 | Signode Corp., Glenview, Ill. | Exhaust silencer for portable pneumatic driving tools |
-
1979
- 1979-05-22 FR FR7913912A patent/FR2457152A1/en active Granted
-
1980
- 1980-05-13 AT AT80420060T patent/ATE691T1/en active
- 1980-05-13 DE DE8080420060T patent/DE3060201D1/en not_active Expired
- 1980-05-13 EP EP80420060A patent/EP0019568B2/en not_active Expired
- 1980-05-17 ES ES491591A patent/ES8101444A1/en not_active Expired
- 1980-05-21 US US06/152,034 patent/US4558763A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0019568A1 (en) | 1980-11-26 |
| ATE691T1 (en) | 1982-03-15 |
| EP0019568B2 (en) | 1986-01-15 |
| FR2457152B1 (en) | 1982-07-09 |
| ES491591A0 (en) | 1980-12-16 |
| FR2457152A1 (en) | 1980-12-19 |
| ES8101444A1 (en) | 1980-12-16 |
| US4558763A (en) | 1985-12-17 |
| DE3060201D1 (en) | 1982-03-25 |
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