EP0147262B1 - Sound-attenuating housing for pneumatic drills - Google Patents

Sound-attenuating housing for pneumatic drills Download PDF

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Publication number
EP0147262B1
EP0147262B1 EP84402259A EP84402259A EP0147262B1 EP 0147262 B1 EP0147262 B1 EP 0147262B1 EP 84402259 A EP84402259 A EP 84402259A EP 84402259 A EP84402259 A EP 84402259A EP 0147262 B1 EP0147262 B1 EP 0147262B1
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EP
European Patent Office
Prior art keywords
hammer
housing
exhaust orifice
chamber
exhaust
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
Application number
EP84402259A
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German (de)
French (fr)
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EP0147262A1 (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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Publication date
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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 cover of the invention is especially useful for the soundproofing of pneumatic hammers of the rotary hammer type installed on a drilling jumbo 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 weak or of large 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.
  • Document EP-A-0 009 229 also discloses a casing containing a pneumatic hammer and formed by two shells joining together with one another around the body of the hammer; this casing has internal transverse partitions which limit with the body of the hammer four successive annular chambers in the longitudinal direction of the hammer, communicating by holes provided in these partitions.
  • the hammer exhaust air enters a first extreme chamber and it propagates through the following chambers in the same direction to the last opposite extreme chamber which is placed in communication with the atmosphere.
  • the main object of the invention is to provide a casing for the soundproofing of a pneumatic hammer whose efficiency is improved.
  • a casing for an air hammer having on one of its sides an air exhaust orifice, composed of assemblable and dismountable parts internally comprising a sound absorbing material, having through its wall an air outlet opening exhaust and limiting with the hammer an internal volume of which at least a fraction is divided by internal partitions in the longitudinal direction of the hammer into several communicating chambers, is characterized according to the invention by the fact that the exhaust port of the hammer s opens in a first chamber located in the middle part of the length of the hammer and the exhaust air outlet opening is in a last chamber determining a return of this air in the opposite direction along the hammer, in an area not containing the exhaust port.
  • the interior volume is divided by two transverse partitions into three chambers between the exhaust orifice and the outlet opening.
  • 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 on the side 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 cross 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 orifices 2 and 3 on the hammer can 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 1A.
  • 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 30 mm, 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; however, the composite sheet could be replaced by 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 make the 1st chamber 11A and the 2nd chamber 11B communicate.
  • 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 a 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 of relatively small section and which one could partially block if necessary, which connect the second chamber 11 B with the third chamber 11 C.
  • 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 the 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.

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 rotopercutant installés sur un jumbo de foration dans les mines et dans les carrières.The cover of the invention is especially useful for the soundproofing of pneumatic hammers of the rotary hammer type installed on a drilling jumbo 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 (A) 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 (A) 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 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 weak or of large 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, no 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. Il 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 entre 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, no 3, November-December 1980, to enclose the whole hammer in a sturdy sheet metal casing (6.4 to 9.5 mm) that can be opened easily and the inner surface 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 as much as possible the contact between the casing and the hammer; 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.

On connaît aussi par le document EP-A-0 009 229 un carter contenant un marteau pneumatique et formé de deux coquilles s'assemblant l'une avec l'autre autour du corps du marteau; ce carter a des cloisons transversales intérieures qui limitent avec le corps du marteau quatre chambres annulaires successives dans le sens longitudinal du marteau, communicantes par des trous prévus dans ces cloisons. Pendant le fonctionnement l'air d'échappement du marteau entre dans une première chambre extrême et il se propage à travers les chambres suivantes dans une même direction jusqu'à la dernière chambre extrême opposée qui est mise en communication avec l'atmosphère.Document EP-A-0 009 229 also discloses a casing containing a pneumatic hammer and formed by two shells joining together with one another around the body of the hammer; this casing has internal transverse partitions which limit with the body of the hammer four successive annular chambers in the longitudinal direction of the hammer, communicating by holes provided in these partitions. During operation, the hammer exhaust air enters a first extreme chamber and it propagates through the following chambers in the same direction to the last opposite extreme chamber which is placed in communication with the atmosphere.

L'invention a pour but principal d'apporter un carter pour l'insonorisation d'un marteau pneumatique dont l'efficacité est améliorée.The main object of the invention is to provide a casing for the soundproofing of a pneumatic hammer whose efficiency is improved.

Un carter pour marteau pneumatique ayant sur un de ses côtés un orifice d'échappement de l'air, composé de parties assemblables et démontables comprenant intérieurement une matière absorbante des bruits, présentant à travers sa paroi une ouverture de sortie de l'air d'échappement et limitant avec le marteau un volume intérieur dont au moins une fraction est divisée par des cloisons internes dans le sens longitudinal du marteau en plusieurs chambres communicantes, est caractérisé selon l'invention par le fait que l'orifice d'échappement du marteau s'ouvre dans une première chambre située dans la partie médiane de la longueur du marteau et l'ouverture de sortie de l'air d'échappement se trouve dans une dernière chambre déterminant un retour de cet air en sens opposé le long de marteau, dans une zone ne contenant pas l'orifice d'échappement.A casing for an air hammer having on one of its sides an air exhaust orifice, composed of assemblable and dismountable parts internally comprising a sound absorbing material, having through its wall an air outlet opening exhaust and limiting with the hammer an internal volume of which at least a fraction is divided by internal partitions in the longitudinal direction of the hammer into several communicating chambers, is characterized according to the invention by the fact that the exhaust port of the hammer s opens in a first chamber located in the middle part of the length of the hammer and the exhaust air outlet opening is in a last chamber determining a return of this air in the opposite direction along the hammer, in an area not containing the exhaust port.

De préférence le volume intérieur est divisé par deux cloisons transversales en trois chambres entre l'orifice d'échappement et l'ouverture de sortie.Preferably the interior volume is divided by two transverse partitions into three chambers between the exhaust orifice and the outlet opening.

De cette façon, le carter joue le role 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 on the side 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 cross 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, dans la mesure où l'étendue de la protection est déterminée par la teneur des revendications, 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.
A description will now be given, without limiting intention and without excluding any variant, in so far as the scope of protection is determined by the content of the claims, 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 orifices 2 and 3 on the hammer can 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 1A. 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 1A. 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 30 mm, 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 30 mm, 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; however, the composite sheet could be replaced by 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 11 B 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 11 B and a third chamber 11C in which an opening 12 which crosses the side wall of the casing 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 1 ère chambre 11A et la 2ème chambre 11 B.The partition 13A is pierced with several holes 14 which make the 1st chamber 11A and the 2nd chamber 11B communicate.

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 11 B avec la troisième chambre 11 C.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 a 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 of relatively small section and which one could partially block if necessary, which connect the second chamber 11 B with the third chamber 11 C.

Ainsi en sortant de l'orifice d'échappement 3 du marteau, l'air d'échappement se détend successivement dans les trois chambres 11A, 11 B, 11 C 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, 11 B, 11 C 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 hammer supply port 2 1 in 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 the 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 (6)

1. A housing for a pneumatic hammer having on one side of it an air exhaust orifice (3), the housing being composed of portions (4, 5, 6) which may be assembled and dismantled and internally comprise noise- absorbent matter (9), exhibiting an opening (12) through its wall for the exhaust air to leave and defining with the hammer (1) an inner volume (10) at least a fraction of which in the direction longitudinal to the hammer is divided by internal partitions (13A, 13B) into a number of communicating chambers (11A, 11B, 11C), characterized in that the exhaust orifice (3) opens into a first chamber (11 A) situated in the central portion of the length of the hammer, and the outlet opening (12) is in a last chamber (11C) which causes a return of the said air in the opposite direction along the hammer into a zone which does not include the exhaust orifice (3).
2. A housing as in Claim 1, characterized in that the inner volume (10) is divided by two transverse partitions (13A, 13B) into three chambers (11 A, 11 B, 11 C) between the exhaust orifice (3) and the outlet opening (12).
3. A housing as in Claim 2, characterized in that the transverse partitions (13A, 13B) are arranged at the side of the hammer (1) where there is the exhaust orifice (3) and on opposite sides of the latter, communication between the last chamber (11 C) and the chamber (11B) which precedes it being effected at the opposite side of the hammer (1) through at least one passage (15) arranged between the housing (5, 6) and the hammer (1).
4. A housing as in Claim 3, characterized in that the transverse partition (13A) nearer the front of the hammer (1) is pierced with a number of holes (14) ensuring its communication with the next chamber (11 B).
5. A housing as in Claim 4, characterized in that the inner volume (10) is divided at the side of the hammer where there is the exhaust orifice (3) into three chambers (11A, 11B, 11 C) by means of a box (13) inverted against the upper face of the hammer (1) in order to contain the said exhaust orifice (3), the said box (13) having a flat bottom (13C) against which is fitted the Inner face of the insulating matter (9) inside the housing.
6. A housing as in any one of the Claims 1 to 5, characterized in that it consists of a composite metal sheet comprising a first sheet of steel, a deadening layer, a second steel sheet and an inner layer of acoustically absorbent matter (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 EP0147262A1 (en) 1985-07-03
EP0147262B1 true EP0147262B1 (en) 1988-06-08

Family

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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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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Also Published As

Publication number Publication date
ZA848781B (en) 1985-07-31
ATE34933T1 (en) 1988-06-15
AU562897B2 (en) 1987-06-18
US4624339A (en) 1986-11-25
DE3471897D1 (en) 1988-07-14
FR2554752A1 (en) 1985-05-17
EP0147262A1 (en) 1985-07-03
ES291672U (en) 1986-05-01
ES291672Y (en) 1987-01-16
JPS60173288A (en) 1985-09-06
AU3529784A (en) 1985-05-16
FR2554752B1 (en) 1986-12-26

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