EP0147262A1 - Sound-attenuating housing for pneumatic drills - Google Patents

Sound-attenuating housing for pneumatic drills Download PDF

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Publication number
EP0147262A1
EP0147262A1 EP84402259A EP84402259A EP0147262A1 EP 0147262 A1 EP0147262 A1 EP 0147262A1 EP 84402259 A EP84402259 A EP 84402259A EP 84402259 A EP84402259 A EP 84402259A EP 0147262 A1 EP0147262 A1 EP 0147262A1
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EP
European Patent Office
Prior art keywords
hammer
exhaust orifice
housing according
exhaust
casing
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.)
Granted
Application number
EP84402259A
Other languages
German (de)
French (fr)
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EP0147262B1 (en
Inventor
Frédéric Etienne Marcel
François Jean Marie Maume
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Charbonnages de France CDF
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Charbonnages de France CDF
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Priority to AT84402259T priority Critical patent/ATE34933T1/en
Publication of EP0147262A1 publication Critical patent/EP0147262A1/en
Application granted granted Critical
Publication of EP0147262B1 publication Critical patent/EP0147262B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/02—Sound muffling

Definitions

  • the subject of the invention is a soundproofing cover intended to contain a pneumatic hammer in order to attenuate the noise produced by the latter and mainly the noise caused at the exhaust by the expansion of the air which leaves this hammer.
  • the hood of the invention is especially useful for the soundproofing of pneumatic hammers of the rotary percussive type installed on a jumbo for drilling in mines and in quarries.
  • the main sources of noise are the exhaust of air, the foil and the body of the air hammer.
  • the total sound energy emitted by the hammer (by the body and by the exhaust of air) varies from 35% to 90% of the total global energy radiated depending on whether it is a light or heavy hammer and that the foil is itself of weak or strong transverse dimension. It is therefore particularly important to reduce the noise emitted by the hammer.
  • the front wall of the casing has an opening for the exit to the atmosphere of the air which comes from the exhaust orifice provided on the hammer. Air circulates freely between this last orifice and the opening through which it escapes to the open air.
  • the main purpose of the invention is to achieve a soundproof casing for an air hammer, the design of which improves efficiency from the point of view of reducing noise due to the exhaust of air.
  • a casing for pneumatic hammer having an air exhaust orifice, composed of easily opening parts and having in one wall an opening for the outlet to the atmosphere of the exhaust air, this outlet opening air being distant from the exhaust orifice, also internally comprises an acoustically absorbent material which generally limits an internal volume around the hammer; according to the invention, the casing cooperates with internal partitions situated on the path going from the exhaust orifice to the air outlet opening, over a substantial fraction of the interior volume to divide the latter into two chambers at less, joined by a communication passage with reduced section.
  • the interior volume is divided into three successive chambers between the exhaust orifice and the outlet opening, in the direction of the length of the casing.
  • the casing plays the role of a pot of successive expansion of the air, like an exhaust in addition to its role of soundproofing hood.
  • a first expansion chamber is created by means of two partitions transverse to the body of the hammer, these partitions being arranged opposite and other of the exhaust port in the longitudinal direction of the hammer; one of these partitions is perforated with several exhaust holes.
  • the air enters a second expansion chamber then borrows a communication passage with reduced section on the side of the hammer opposite to that where the exhaust orifice is located, to reach a third expansion chamber in which opens the air outlet opening.
  • the partitions are directly in contact with the body of the hammer and they are in contact on the side of the casing with the absorbent material which is part of the latter.
  • the absorbent material is advantageously a polyurethane foam burnt on the surface so that, the surface pores being thus closed, it has a closed continuous surface;
  • the metal part of the casing is a composite sheet, commercially available comprising a first external steel sheet, a damping material, a second internal steel sheet.
  • a pneumatic hammer 1 has an orifice 2 for supplying compressed air and an orifice 3 for exhausting the air used.
  • the relative position of these holes 2 and 3 on the hammer may be different depending on the manufacturer; the invention is easily adaptable to any position of these orifices.
  • a casing according to the invention is made in three parts; a sole 4 is intended to be fixed to the movement carriage on which the hammer rests during use. On this sole 4 is disposed in turn the hammer 1 by its own sole lA.
  • a housing body 5 almost entirely contains the hammer 1.
  • a cover 6 is fixed to the body 5 of the housing.
  • the cover 6 and the body 5 are joined in a joint plane using two corresponding perimeter flanges 7, 8 pierced with holes for the passage of bolts.
  • the parting line has a step such that it descends closer to the sole 4 in the front part of the hammer 1 so that this part, where the drill bit is put in place (not shown), is more accessible after removal of the cover 6.
  • the sole 4, the body 5 and the cover 6 are made of a composite sheet coated on its entire inner surface, after making the casing, with an acoustically absorbent material 9.
  • Any suitable absorbent material can be used.
  • the interior absorbent material 9 is a rather firm, open-pore, commercially available polyurethane foam, the exposed surface of which has been burnt so that it becomes continuous, relatively smooth and resists penetration. fats.
  • the composite sheet comprises a first outer steel sheet with a thickness of 3.5 mm, a damping material with a thickness of 0.5 mm and an inner steel sheet with a thickness of 1 mm.
  • the wall of the casing 1 has a thickness of 30mm, ie 5 mm for the composite sheet and 25 mm for the interior absorbent material 9.
  • Such a casing is effective because of its heterogeneous constitution; we could however replace the composite sheet with a heterogeneous synthetic material produced otherwise, for example using a moldable synthetic material loaded with fibers.
  • This internal volume 10 is divided into several successive expansion chambers communicating.
  • this opening 12 straddles the joint plane of the body 5 and the cover 6, which is not shown in the schematic representation of FIGS. 3 and 4.
  • the latter better show the three chambers 11A, 11B, 11C.
  • These are produced by means of two partitions 13A, 13B transverse to the hammer 1 which divide the internal volume 10 into three chambers in the longitudinal direction of the hammer, in an area which leads from the exhaust orifice 3 to the opening outlet 12.
  • the first chamber 11A is located in the central region of the hammer in the longitudinal direction and it contains the exhaust orifice 3.
  • the partition 13A is pierced with several holes 14 which communicate the 1st chamber 11A and the 2nd chamber 11B.
  • partitions 13A and 13B are located on the upper side of the hammer 1 where the exhaust orifice 3 is located; they completely or almost completely cut, in transverse direction, the internal volume 10 but there remain on the opposite side or lower side of the hammer 1, between its sole 1A and its body, two symmetrical passages 15 with relative section vement weak and that could be partially closed if necessary, which communicate the second chamber 11B with the third chamber 11C.
  • the partitions 13A, 13B can be produced in many equivalent ways; they can be an integral part of the casing, for example of the cover 6, and come into contact with the external surface of the hammer. They can also be fixed to the surface of the hammer so that the casing comes to bear against their edge by its internal surface or more exactly by the internal surface of the insulating material 9 which forms part of it. In the example described here, another variant has been produced.
  • the partitions 13A, 13B are the two end walls in the longitudinal direction of a box 13 better visible in FIG. 1, inverted on the upper face of the hammer, to which it is fixed, to contain the exhaust orifice 3. This box 13 has a flat bottom 13C against which the internal face of the absorbent material 9 which is part of the cover 6 bears.
  • the casing has, for the passage of a connection pipe, an opening 16 which is also, preferably, astride the joint plane between the body 5 and cover 6.
  • the partitions 13A, 13B are shaped and arranged as a function of the relative situation of the supply orifice 2 and the exhaust orifice 3 so as to provide the desired expansion chambers between the latter and an outlet opening 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Pipe Accessories (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

The internal absorbent layer (9) of the casing delimits an internal volume (10) around the drill (1), which volume is divided on either side of the exhaust orifice (3) by two transverse partitions (13A, 13B) into three successive expansion chambers (11A, 11B, 11C) between the exhaust orifice (3) and the outlet opening (12) to the air outside the casing.

Description

L'invention a pour objet un capot insonorisant destiné à contenir un marteau pneumatique afin d'atténuer le bruit produit par ce dernier et principalement le bruit provoqué à l'échappement par la détente de l'air qui sort de ce marteau.The subject of the invention is a soundproofing cover intended to contain a pneumatic hammer in order to attenuate the noise produced by the latter and mainly the noise caused at the exhaust by the expansion of the air which leaves this hammer.

Le capot de l'invention est spécialement utile pour l'insonorisation des marteaux pneumatiques de type roto- percutant installés sur un jumbo de foration dans les mines et dans les carrières.The hood of the invention is especially useful for the soundproofing of pneumatic hammers of the rotary percussive type installed on a jumbo for drilling in mines and in quarries.

Le personnel qui se trouve à proximité de ces engins est exposé à un niveau élevé de bruit, qui dépasse 105 dB (AI et qui est la cause de désordres physiologiques en particulier de surdité.Personnel in the vicinity of these devices are exposed to a high level of noise, which exceeds 105 dB (AI) and which is the cause of physiological disorders, in particular deafness.

On sait que les sources principales du bruit sont l'échappement de l'air, le fleuret et le corps du marteau pneumatique. Le total de l'énergie sonore émise par le marteau (par le corps et par l'échappement de l'air) varie de 35 % à 90 % de la totalité de l'énergie globale rayonnée selon qu'il s'agit d'un marteau léger ou lourd et que le fleuret est lui-même de faible ou de forte-dimension transversale. Il est donc particulièrement important de réduire le bruit émis par le marteau.We know that the main sources of noise are the exhaust of air, the foil and the body of the air hammer. The total sound energy emitted by the hammer (by the body and by the exhaust of air) varies from 35% to 90% of the total global energy radiated depending on whether it is a light or heavy hammer and that the foil is itself of weak or strong transverse dimension. It is therefore particularly important to reduce the noise emitted by the hammer.

Il a déjà été proposé, notamment dans un article intitulé "Noise Control of Jumbo - Mounted Percussive Drills" paru dans la revue "NOISE CONTROL ENGINEERING", volume 15, n° 3, Novembre-Décembre 1980, d'enfermer l'ensemble du marteau dans un carter en tôle robuste (de 6,4 à 9,5 mm) s'ouvrant facilement dont la surface intérieure est couverte d'une matière acoustiquement isolante (exactement de la laine de verre) tenue en place par une plaque perforée. Selon ce document, ni le carter, ni la matière isolante, ni la plaque perforée de maintien ne sont en contact avec le marteau. Il est essentiel d'éviter le plus possible le contact entre le carter et le marteau ; ce dernier ne touche le carter que par sa semelle. I1 existe donc un volume intérieur libre- entre le marteau et le carter, sur toute la longueur de ce dernier. La paroi avant du carter possède une ouverture pour la sortie à l'atmosphère de l'air qui provient de l'orifice d'échappement prévu sur le marteau. L'air circule librement entré ce dernier orifice et l'ouverture par laquelle il s'échappe à l'air libre.It has already been proposed, in particular in an article entitled "Noise Control of Jumbo - Mounted Percussive Drills" published in the review "NOISE CONTROL ENGINEERING", volume 15, n ° 3, November-December 1980, to enclose the entire hammer in a sturdy sheet metal casing (6.4 to 9.5 mm) easily opened, the inner surface of which is covered with an acoustically insulating material (exactly glass wool) held in place by a perforated plate. According to this document, neither the housing, the insulating material, nor the perforated holding plate are in contact with the hammer. It is essential to avoid contact between the casing and the hammer as much as possible; the latter only touches the casing by its sole. There is therefore a free interior volume between the hammer and the casing, over the entire length of the latter. The front wall of the casing has an opening for the exit to the atmosphere of the air which comes from the exhaust orifice provided on the hammer. Air circulates freely between this last orifice and the opening through which it escapes to the open air.

L'invention a pour but principal de parvenir à un carter insonorisé pour marteau pneumatique, dont la conception apporte une amélioration de l'efficacité au point de vue de.la diminution du bruit dû à l'échappement de l'air.The main purpose of the invention is to achieve a soundproof casing for an air hammer, the design of which improves efficiency from the point of view of reducing noise due to the exhaust of air.

Un carter, pour marteau pneumatique ayant un orifice d'échappement de l'air, composé de parties s'ouvrant facilement et présentant dans une paroi une ouverture pour la sortie à l'atmosphère de l'air d'échappement, cette ouverture de sortie de l'air étant éloignée de l'orifice d'échappement, comprend aussi intérieurement une matière acoustiquement absorbante qui limite dans l'ensemble un volume intérieur autour du marteau ; selon l'invention, le carter coopère avec des cloisons internes situées sur le trajet allant de l'orifice d'échappement à l'ouverture de sortie de l'air, sur une fraction substantielle du volume intérieur pour diviser ce dernier en deux chambres au moins, réunies par un passage de communication à section réduite.A casing, for pneumatic hammer having an air exhaust orifice, composed of easily opening parts and having in one wall an opening for the outlet to the atmosphere of the exhaust air, this outlet opening air being distant from the exhaust orifice, also internally comprises an acoustically absorbent material which generally limits an internal volume around the hammer; according to the invention, the casing cooperates with internal partitions situated on the path going from the exhaust orifice to the air outlet opening, over a substantial fraction of the interior volume to divide the latter into two chambers at less, joined by a communication passage with reduced section.

De préférence, le volume intérieur est divisé en trois chambres successives entre l'orifice d'échappement et l'ouverture de sortie, dans le sens de la longueur du carter.Preferably, the interior volume is divided into three successive chambers between the exhaust orifice and the outlet opening, in the direction of the length of the casing.

De cette façon, le carter joue le rôle d'un pot de détentes successives de l'air, à la façon d'un pot d'échappement en plus de son rôle de capot d'insonorisation.In this way, the casing plays the role of a pot of successive expansion of the air, like an exhaust in addition to its role of soundproofing hood.

Selon un mode de réalisation préféré de l'invention, sur le côté du marteau où se trouve l'orifice d'échappement est créée une première chambre de détente au moyen de deux cloisons transversales au corps du marteau, ces cloisons étant disposées de part et d'autre de l'orifice d'échappement en sens longitudinal du marteau ; l'une de ces cloisons est perforée de plusieurs trous d'échappement. De cette façon, l'air pénètre dans une deuxième chambre de détente puis emprunte un passage de communication à section réduite sur le côté du marteau opposé à celui où se trouve l'orifice d'échappement pour parvenir à une troisième chambre de détente dans laquelle débouche l'ouverture de sortie de l'air.According to a preferred embodiment of the invention, on the side of the hammer where the exhaust orifice is located, a first expansion chamber is created by means of two partitions transverse to the body of the hammer, these partitions being arranged opposite and other of the exhaust port in the longitudinal direction of the hammer; one of these partitions is perforated with several exhaust holes. In this way, the air enters a second expansion chamber then borrows a communication passage with reduced section on the side of the hammer opposite to that where the exhaust orifice is located, to reach a third expansion chamber in which opens the air outlet opening.

De préférence aussi, les cloisons sont directement en contact avec le corps du marteau et elles sont en contact du côté du carter avec la matière absorbante qui fait partie de ce dernier.Also preferably, the partitions are directly in contact with the body of the hammer and they are in contact on the side of the casing with the absorbent material which is part of the latter.

La matière absorbante est avantageusement une mousse de polyuréthane brûlée en surface pour que, les pores superficiels étant ainsi obturés, elle présente une surface continue fermée ; de plus la partie métallique du carter est une tôle composite, disponible dans le commerce comprenant une première tôle d'acier extérieure, une matière amortissante, une seconde tôle d'acier intérieure.The absorbent material is advantageously a polyurethane foam burnt on the surface so that, the surface pores being thus closed, it has a closed continuous surface; in addition, the metal part of the casing is a composite sheet, commercially available comprising a first external steel sheet, a damping material, a second internal steel sheet.

On donnera maintenant, sans intention limitative et sans exclure aucune variante, une description d'un mode préféré de réalisation. On se reportera au dessin annexé dans lequel :

  • - la figure 1 est une vue en perspective de l'arrière d'un carter conforme à l'invention, représenté à l'état ouvert pour montrer le marteau contenu dans ce carter,
  • - la figure 2 est une vue de dessus de la partie du carter de la figure 1 qui contient le marteau,
  • - la figure 3 est une vue schématique en élévation et en coupe longitudinale du carter de l'invention représenté à l'état fermé pour montrer les chambres de détente successives,
  • - la figure 4 est une vue schématique en coupe transversale selon IV-IV de la figure 3.
We will now give, without limiting intention and without excluding any variant, a description of a preferred embodiment. Reference is made to the appended drawing in which:
  • FIG. 1 is a perspective view of the rear of a casing according to the invention, shown in the open state to show the hammer contained in this casing,
  • FIG. 2 is a top view of the part of the casing of FIG. 1 which contains the hammer,
  • FIG. 3 is a schematic view in elevation and in longitudinal section of the casing of the invention shown in the closed state to show the successive expansion chambers,
  • - Figure 4 is a schematic cross-sectional view along IV-IV of Figure 3.

Un marteau pneumatique 1 a un orifice 2 d'alimentation en air comprimé et un orifice 3 d'échappement de l'air utilisé. La position relative de ces orifices 2 et 3 sur le marteau peut être différente selon les constructeurs ; l'invention est facilement adaptable à toute position de ces orifices.A pneumatic hammer 1 has an orifice 2 for supplying compressed air and an orifice 3 for exhausting the air used. The relative position of these holes 2 and 3 on the hammer may be different depending on the manufacturer; the invention is easily adaptable to any position of these orifices.

Un carter, selon l'invention, est réalisé en trois parties ; une semelle 4 est destinée à être fixée au chariot de déplacement sur lequel repose le marteau pendant l'utilisation. Sur cette semelle 4 est disposé à son tour le marteau 1 par sa propre semelle lA. Un corps 5 de carter contient presque en totalité le marteau 1. Un couvercle 6 se fixe sur le corps 5 du carter.A casing according to the invention is made in three parts; a sole 4 is intended to be fixed to the movement carriage on which the hammer rests during use. On this sole 4 is disposed in turn the hammer 1 by its own sole lA. A housing body 5 almost entirely contains the hammer 1. A cover 6 is fixed to the body 5 of the housing.

Le couvercle 6 et le corps 5 sont réunis dans un plan de joint à l'aide de deux brides périmétriques correspondantes 7, 8 percées de trous pour le passage de boulons. Le plan de joint présente un décrochement tel qu'il descend plus près de la semelle 4 dans la partie antérieure du marteau 1 afin que cette partie, où se met en place le fleuret de foration (non représenté),soit plus accessible après enlèvement du couvercle 6.The cover 6 and the body 5 are joined in a joint plane using two corresponding perimeter flanges 7, 8 pierced with holes for the passage of bolts. The parting line has a step such that it descends closer to the sole 4 in the front part of the hammer 1 so that this part, where the drill bit is put in place (not shown), is more accessible after removal of the cover 6.

La semelle 4, le corps 5 et le couvercle 6 sont réalisés en une tôle composite revêtue sur la totalité de sa surface intérieure, après confection du carter,d'une matière acoustiquement absorbante 9. Toute matière absorbante convenable peut être utilisée. Dans cet exemple, la matière absorbante intérieure 9 est une mousse de polyuréthane disponible dans le commerce, plutôt ferme, à pores ouverts, dont la surface exposée a été brûlée pour qu'elle devienne continue, relativement lisse et qu'elle résiste à la pénétration des graisses.The sole 4, the body 5 and the cover 6 are made of a composite sheet coated on its entire inner surface, after making the casing, with an acoustically absorbent material 9. Any suitable absorbent material can be used. In this example, the interior absorbent material 9 is a rather firm, open-pore, commercially available polyurethane foam, the exposed surface of which has been burnt so that it becomes continuous, relatively smooth and resists penetration. fats.

La tôle composite comprend une première- tôle d'acier extérieure d'une épaisseur de 3,5 mm, une matière amortissante d'une épaisseur de 0,5 mm et une tôle d'acier intérieure d'une épaisseur de 1 mm. Au total, la paroi du carter 1 a une épaisseur de 30mm, soit 5 mm pour la tôle composite et 25 mm pour la matière absorbante intérieure 9. Un tel carter est efficace en raison de sa constitution hétérogène ; on pourrait cependant remplacer la tôle composite par une matière synthétique hétérogène réalisée autrement, par exemple à l'aide d'un matériau synthétique moulable chargé de fibres.The composite sheet comprises a first outer steel sheet with a thickness of 3.5 mm, a damping material with a thickness of 0.5 mm and an inner steel sheet with a thickness of 1 mm. In total, the wall of the casing 1 has a thickness of 30mm, ie 5 mm for the composite sheet and 25 mm for the interior absorbent material 9. Such a casing is effective because of its heterogeneous constitution; we could however replace the composite sheet with a heterogeneous synthetic material produced otherwise, for example using a moldable synthetic material loaded with fibers.

Sauf à l'emplacement de la semelle même 1A du marteau 1 qui repose sur la semelle 4 du carter, plus exactement sur la couche de matière isolante 9 qui fait partie de cette semelle 4, et sauf aussi sur ses faces latérales et extrêmes, le carter limite autour du marteau 1 un volume intérieur 10. Ce volume intérieur 10 est divisé en plusieurs chambres de détente successives communicantes. Dans cet exemple, il existe une première chambre 11A dans laquelle s'ouvre l'orifice d'échappement 3 du marteau, une deuxième chambre 11B intermédiaire et une troisième chambre 11C dans laquelle s'ouvre une ouverture 12 qui traverse la paroi latérale du carter pour la sortie à l'atmosphère de l'air d'échappement. De préférence, cette ouverture 12 est à cheval sur le plan de joint du corps 5 et du couvercle 6, ce que ne montre pas la représentation schématique des figures 3 et 4. En revanche, ces dernières montrent mieux les trois chambres 11A, 11B, 11C. Celles-ci sont réalisées au moyen de deux cloisons 13A, 13B transversales au marteau 1 qui divisent le volume intérieur 10 en trois chambres dans le sens longitudinal du marteau, dans une zone qui conduit de l'orifice d'échappement 3 à l'ouverture de sortie 12. Ainsi la première chambre 11A se trouve dans la zone médiane du marteau en sens longitudinal et elle contient l'orifice d'échappement 3.Except at the location of the sole 1A of the hammer 1 which rests on the sole 4 of the casing, more precisely on the layer of insulating material 9 which is part of this sole 4, and except also on its lateral and extreme faces, the housing limits around the hammer 1 an internal volume 10. This internal volume 10 is divided into several successive expansion chambers communicating. In this example, there is a first chamber 11A in which the exhaust orifice 3 of the hammer opens, a second intermediate chamber 11B and a third chamber 11C in which an opening 12 which crosses the side wall of the casing opens. for the exhaust air to the atmosphere. Preferably, this opening 12 straddles the joint plane of the body 5 and the cover 6, which is not shown in the schematic representation of FIGS. 3 and 4. On the other hand, the latter better show the three chambers 11A, 11B, 11C. These are produced by means of two partitions 13A, 13B transverse to the hammer 1 which divide the internal volume 10 into three chambers in the longitudinal direction of the hammer, in an area which leads from the exhaust orifice 3 to the opening outlet 12. Thus the first chamber 11A is located in the central region of the hammer in the longitudinal direction and it contains the exhaust orifice 3.

La cloison 13A est percée de plusieurs trous 14 qui font communiquer la 1ère chambre 11A et la 2éme chambre 11B.The partition 13A is pierced with several holes 14 which communicate the 1st chamber 11A and the 2nd chamber 11B.

Ces cloisons 13A et 13B se trouvent sur le côté supérieur du marteau 1 où se trouve l'orifice d'échappement 3 ; elles coupent totalement ou presque totalement, en sens transversal, le volume intérieur 10 mais il reste sur le côté opposé ou côté inférieur du marteau 1, entre sa semelle 1A et son corps, deux passages symétriques 15 à section relativement faible et que l'on pourrait obturer partiellement s'il le fallait, qui font communiquer la deuxième chambre 11B avec la troisième chambre 11C.These partitions 13A and 13B are located on the upper side of the hammer 1 where the exhaust orifice 3 is located; they completely or almost completely cut, in transverse direction, the internal volume 10 but there remain on the opposite side or lower side of the hammer 1, between its sole 1A and its body, two symmetrical passages 15 with relative section vement weak and that could be partially closed if necessary, which communicate the second chamber 11B with the third chamber 11C.

Ainsi en sortant de l'orifice d'échappement 3 du marteau, l'air d'échappement se détend successivement dans les trois chambres 11A, 11B, 11C avant d'atteindre l'ouverture de sortie 12.Thus, leaving the exhaust orifice 3 of the hammer, the exhaust air successively expands in the three chambers 11A, 11B, 11C before reaching the outlet opening 12.

Les cloisons 13A, 13B peuvent être réalisées de nombreuses manières équivalentes ; elles peuvent faire partie intégrante du carter, par exemple du couvercle 6,et venir en contact avec la surface extérieure du marteau. Elles peuvent aussi être fixées à la surface du marteau pour que le carter vienne s'appuyer contre leur tranche par sa surface intérieure ou plus exactement par la surface intérieure de la matière isolante 9 qui en fait partie. Dans l'exemple décrit ici, une autre variante a été réalisée. Les cloisons 13A, 13B sont les deux parois extrêmes en sens longitudinal d'une boîte 13 mieux visible sur la figure 1, renversée sur la face supérieure du marteau, auquel elle est fixée, pour contenir l'orifice d'échappement 3. Cette boîte 13 a un fond plat 13C contre lequel vient s'appuyer la face intérieure de la matière absorbante 9 qui fait partie du couvercle 6.The partitions 13A, 13B can be produced in many equivalent ways; they can be an integral part of the casing, for example of the cover 6, and come into contact with the external surface of the hammer. They can also be fixed to the surface of the hammer so that the casing comes to bear against their edge by its internal surface or more exactly by the internal surface of the insulating material 9 which forms part of it. In the example described here, another variant has been produced. The partitions 13A, 13B are the two end walls in the longitudinal direction of a box 13 better visible in FIG. 1, inverted on the upper face of the hammer, to which it is fixed, to contain the exhaust orifice 3. This box 13 has a flat bottom 13C against which the internal face of the absorbent material 9 which is part of the cover 6 bears.

En face de l'orifice 2 d'alimentation du marteau 1 en air comprimé,le carter présente pour le passage d'un tuyau de raccordement une ouverture 16 qui est aussi, de préférence, à cheval sur le plan de joint entre le corps 5 et le couvercle 6.Opposite the orifice 2 for supplying the hammer 1 with compressed air, the casing has, for the passage of a connection pipe, an opening 16 which is also, preferably, astride the joint plane between the body 5 and cover 6.

Les cloisons 13A, 13B sont conformées et disposées en fonction de la situation relative de l'orifice d'alimentation 2 et de l'orifice d'échappement 3 afin de ménager les chambres de détente voulues entre ce dernier et une ouverture de sortie 12.The partitions 13A, 13B are shaped and arranged as a function of the relative situation of the supply orifice 2 and the exhaust orifice 3 so as to provide the desired expansion chambers between the latter and an outlet opening 12.

Claims (8)

1. Carter pour marteau pneumatique (1) ayant un orifice (3) d'échappement de l'air, composé de parties (4,5,6) assemblables et démontables comprenant une matière absorbante intérieure (9), présentant à travers sa paroi une ouverture de sortie (12) de l'air d'échappement et limitant avec le marteau (1) un volume intérieur (10), caractérisé en ce que ce carter coopère avec des cloisons internes (13A,13B) situées sur le trajet allant de l'orifice d'échappement (3) à l'ouverture de sortie (12) pour diviser au moins une fraction du volume intérieur (10) eh deux chambres successives au moins, réunies par un passage de communication à section réduite.1. Housing for pneumatic hammer (1) having an air exhaust port (3), composed of parts (4,5,6) which can be assembled and dismantled comprising an interior absorbent material (9), having through its wall an outlet opening (12) for the exhaust air and limiting with the hammer (1) an internal volume (10), characterized in that this casing cooperates with internal partitions (13A, 13B) situated on the path going from the exhaust orifice (3) to the outlet opening (12) to divide at least a fraction of the interior volume (10) in at least two successive chambers, joined by a communication passage with reduced section. 2. Carter selon la revendication 1, caractérisé en ce que le volume intérieur (10) est divisé en trois chambres successives communicantes (11A, 11B, 11C) entre l'orifice d'échappement (3) et l'ouverture de sortie (12).2. Housing according to claim 1, characterized in that the interior volume (10) is divided into three successive communicating chambers (11A, 11B, 11C) between the exhaust orifice (3) and the outlet opening (12 ). 3. Carter selon la revendication 2, caractérisé en ce que les trois chambres (11A, 11B, 11C) se succèdent dans le sens longitudinal du marteau, le volume intérieur (10) étant divisé par deux cloisons transversales (13A, 13B).3. Housing according to claim 2, characterized in that the three chambers (11A, 11B, 11C) follow one another in the longitudinal direction of the hammer, the internal volume (10) being divided by two transverse partitions (13A, 13B). 4. Carter selon la revendication 3, caractérisé en ce que les cloisons transversales (13A, 13B) sont situées sur le côté du marteau (1) où se trouve l'orifice d'échappement (3), la communication entre deux chambres successives (11B, 11C) se faisant sur le côté opposé du marteau (1) par au moins un passage (15).4. Housing according to claim 3, characterized in that the transverse partitions (13A, 13B) are located on the side of the hammer (1) where the exhaust orifice (3) is located, the communication between two successive chambers ( 11B, 11C) being made on the opposite side of the hammer (1) by at least one passage (15). 5. Carter selon la revendication 4, caractérisé en ce que les deux cloisons transversales (13A,13B) sont disposées de part et d'autre de l'orifice d'échappement (3), dans la zone médiane en sens longitudinal du marteau (1) de sorte que la première chambre (11A) se trouve aussi dans ladite zone médiane et contient l'orifice d'échappement (3).5. Housing according to claim 4, characterized in that the two transverse partitions (13A, 13B) are arranged on either side of the exhaust orifice (3), in the median zone in the longitudinal direction of the hammer ( 1) so that the first chamber (11A) is also located in said middle zone and contains the exhaust orifice (3). 6. Carter selon la revendication 5, caractérisé en ce que la cloison transversale (13A) plus proche de l'avant du marteau (1) est percée de plusieurs trous (14) qui assurent la communication avec la chambre suivante (11B).6. Housing according to claim 5, characterized in that the transverse partition (13A) closer to the front the hammer (1) is pierced with several holes (14) which ensure communication with the next chamber (11B). 7. Carter selon la revendication 6 caractérisé en ce que le volume intérieur (10) est divisé sur le côté du marteau (1) où se trouve l'orifice d'échappement (3) en trois chambres (11A, 11B, 11C) au moyen d'une boite (13) renversée sur la face supérieure du marteau (1) pour contenir cet orifice d'échappement (3), cette boite (13) ayant un fond plat (13C) contre lequel s'applique la face intérieure de la matière isolante intérieure (9) du carter.7. Housing according to claim 6 characterized in that the interior volume (10) is divided on the side of the hammer (1) where the exhaust orifice (3) is located in three chambers (11A, 11B, 11C) at means of a box (13) overturned on the upper face of the hammer (1) to contain this exhaust orifice (3), this box (13) having a flat bottom (13C) against which the inner face of the inner insulating material (9) of the casing. 8. Carter selon l'une quelconque des revendications 1 à 7 caractérisé en ce qu'il est constitué par une tôle composite comprenant une première tôle d'acier, une couche amortissante, une deuxième tôle d'acier et une couche intérieure de matière absorbante acoustiquement (9).8. Housing according to any one of claims 1 to 7 characterized in that it is constituted by a composite sheet comprising a first steel sheet, a damping layer, a second steel sheet and an inner layer of absorbent material acoustically (9).
EP84402259A 1983-11-10 1984-11-09 Sound-attenuating housing for pneumatic drills Expired EP0147262B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402259T ATE34933T1 (en) 1983-11-10 1984-11-09 SOUND ABSORBING HOUSING FOR PNEUMATIC DRILL HAMMER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8317900A FR2554752B1 (en) 1983-11-10 1983-11-10 SOUNDPROOFING HOUSING FOR PNEUMATIC DRILLING HAMMER
FR8317900 1983-11-10

Publications (2)

Publication Number Publication Date
EP0147262A1 true EP0147262A1 (en) 1985-07-03
EP0147262B1 EP0147262B1 (en) 1988-06-08

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ID=9293991

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EP84402259A Expired EP0147262B1 (en) 1983-11-10 1984-11-09 Sound-attenuating housing for pneumatic drills

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Country Link
US (1) US4624339A (en)
EP (1) EP0147262B1 (en)
JP (1) JPS60173288A (en)
AT (1) ATE34933T1 (en)
AU (1) AU562897B2 (en)
DE (1) DE3471897D1 (en)
ES (1) ES291672Y (en)
FR (1) FR2554752B1 (en)
ZA (1) ZA848781B (en)

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WO1991017870A1 (en) * 1990-05-23 1991-11-28 Outokumpu Oy Hydraulic impact hammer
EP0695602A1 (en) * 1994-07-04 1996-02-07 Krupp Maschinentechnik Gesellschaft Mit Beschränkter Haftung Hydraulically operated hammer with spraying arrangement for dust retention
EP0935058A3 (en) * 1998-02-06 2000-09-06 Isuzu Ceramics Research Institute Co., Ltd. Radiators and soundproofing engine enclosure designs
EP2105261A1 (en) * 2008-03-27 2009-09-30 AEG Electric Tools GmbH Electric tool, in particular hammer drill and/or chipping hammer

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US5419404A (en) * 1990-05-23 1995-05-30 Bretec Oy Hydraulic impact hammer
US5272285A (en) * 1992-08-20 1993-12-21 Scott Mfg., Inc. Sound attenuating machinery cover
US6067409A (en) * 1996-06-28 2000-05-23 Lsi Logic Corporation Advanced modular cell placement system
FI108561B (en) * 1998-09-29 2002-02-15 Tamrock Oy Case for sound insulation of rock drilling equipment and arrangement with rock drilling equipment
KR200207572Y1 (en) * 1998-12-04 2001-01-15 이원해 Soundproof Dustproof Device of Hydraulic Rock Drill
US6220369B1 (en) * 2000-09-20 2001-04-24 Hey Yeh Scrap removing and tool cooling device for a front holding end of a tool spindle of a machine tool
JP3740694B2 (en) * 2002-02-22 2006-02-01 日立工機株式会社 Electric tool
US20070246237A1 (en) * 2006-04-24 2007-10-25 Emile Homsi Vibration dampening of a power tool
US7681690B2 (en) * 2007-07-13 2010-03-23 Longyear Tm, Inc. Noise abatement device for a pneumatic tool
DE102008063113A1 (en) * 2008-01-09 2009-07-16 Marquardt Gmbh power tool
FR2927010B1 (en) 2008-01-31 2010-06-11 Sullair Europ COMPRESSED AIR PIECH HAMPER DEVICE
US7735603B2 (en) * 2008-05-28 2010-06-15 Longyear Tm, Inc. Noise reducing device for a pneumatic tool
WO2010150185A1 (en) * 2009-06-23 2010-12-29 Compair (Sa) (Pty) Ltd Muffler for pneumatic rock drill
US8215449B2 (en) * 2009-12-02 2012-07-10 Longyear Tm, Inc. Muffler system for noise abatement and ice control
US9153225B2 (en) 2011-12-16 2015-10-06 Emerson Climate Technologies, Inc. Sound enclosure for enclosing a compressor assembly
US10195701B2 (en) * 2014-03-03 2019-02-05 Noretud Industies Seal placement device

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WO1991017870A1 (en) * 1990-05-23 1991-11-28 Outokumpu Oy Hydraulic impact hammer
EP0695602A1 (en) * 1994-07-04 1996-02-07 Krupp Maschinentechnik Gesellschaft Mit Beschränkter Haftung Hydraulically operated hammer with spraying arrangement for dust retention
EP0935058A3 (en) * 1998-02-06 2000-09-06 Isuzu Ceramics Research Institute Co., Ltd. Radiators and soundproofing engine enclosure designs
EP2105261A1 (en) * 2008-03-27 2009-09-30 AEG Electric Tools GmbH Electric tool, in particular hammer drill and/or chipping hammer

Also Published As

Publication number Publication date
ATE34933T1 (en) 1988-06-15
FR2554752A1 (en) 1985-05-17
AU3529784A (en) 1985-05-16
JPS60173288A (en) 1985-09-06
FR2554752B1 (en) 1986-12-26
ES291672U (en) 1986-05-01
DE3471897D1 (en) 1988-07-14
ZA848781B (en) 1985-07-31
EP0147262B1 (en) 1988-06-08
ES291672Y (en) 1987-01-16
AU562897B2 (en) 1987-06-18
US4624339A (en) 1986-11-25

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