EP2244860B1 - Pneumatic hammer - Google Patents

Pneumatic hammer Download PDF

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Publication number
EP2244860B1
EP2244860B1 EP09706256A EP09706256A EP2244860B1 EP 2244860 B1 EP2244860 B1 EP 2244860B1 EP 09706256 A EP09706256 A EP 09706256A EP 09706256 A EP09706256 A EP 09706256A EP 2244860 B1 EP2244860 B1 EP 2244860B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
pneumatic hammer
hammer device
casing parts
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.)
Not-in-force
Application number
EP09706256A
Other languages
German (de)
French (fr)
Other versions
EP2244860A2 (en
Inventor
Julien Poncet
Alain Mucig
Patrice Charlat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sullair Europe SARL
Original Assignee
Sullair Europe SARL
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Publication date
Application filed by Sullair Europe SARL filed Critical Sullair Europe SARL
Publication of EP2244860A2 publication Critical patent/EP2244860A2/en
Application granted granted Critical
Publication of EP2244860B1 publication Critical patent/EP2244860B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B25D17/04—Handles; Handle mountings
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/04—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/065—Details regarding assembling of the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/181—Pneumatic tool components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/365—Use of seals

Definitions

  • the invention provides a pneumatic jackhammer device comprising an outer casing, a moving cylinder and piston assembly actuating a piercing element, a compressed air cylinder supply device, an air exhaust device and a device operating control device, characterized in that said outer casing is derived from two complementary parts adapted to fit one with the other to enclose in addition to the cylinder and piston assembly said cylinder supply devices, d air exhaust and control of the operation and in that at least one channel of the supply device and / or the exhaust device is formed in at least one of the housing parts, this channel being formed laterally in the thickness of the housing part, parallel to the cylinder.
  • At least one channel of the supply device and / or the exhaust device may be provided in at least one of the housing parts, thus avoiding the use of external pipes.
  • the housing parts are advantageously two half-shells made of plastic substantially symmetrical to one another with respect to a longitudinal median plane of the hammer device and intended to be mounted tightly to one another and in a leak-tight manner for example by a set of screws arranged at their periphery.
  • the two housing parts can thus be exchanged easily in case of wear or breakage.
  • Their sealed assembly is advantageously provided by a peripheral bead of one of the parts crashing in the clamping in a corresponding groove of the other part, and possibly on a flexible joint.
  • the main operating arm of the handle can further integrate the supply pipe connection at its outer end and a supply valve connected to the control portion (control trigger).
  • the jackhammer device 1 comprises an outer casing 3, a cylinder assembly 5 and movable piston 7 actuating a piercing element 9, a feed device 11 of the cylinder 5 with compressed air, an exhaust system of 13 and an operating control device 15.
  • the outer casing 3 comprises two half-shells 3a assembled to one another along a median longitudinal plane of the device, being tightened against each other by means of screws 17 arranged at their periphery.
  • These half-shells 3a derived from plastic molding, enclose said supply devices 11, exhaust 13 and control 15 of the jackhammer, trapping them rigidly in corresponding housings, respectively 11a, 13a, 15a, formed during of their assembly. They are mounted in a sealed manner to one another by means of a periphery seal 19 constituted by a peripheral bead 19a of a half-shell crashing while being clamped in a complementary groove 19b of the other ( figure 5 ) and leaning possibly on a flexible joint 19c bottom of the groove.
  • a periphery seal 19 constituted by a peripheral bead 19a of a half-shell crashing while being clamped in a complementary groove 19b of the other ( figure 5 ) and leaning possibly on a flexible joint 19c bottom of the groove.
  • the cylinder 5 and piston 7 assembly extends axially substantially along the length of the body 23 of the hammer device.
  • the cylinder 5 conventionally houses, at its rear part, the compressed air distribution section 25, which is connected to the compressed air supply device 11 mounted in the main branch 21a of the handle, and comprises in its part before the gripping portion of the piercing element 9 or ball stagger 27.
  • the latter is formed in an enlarged axial extension before 5 'of the cylinder, comprising conventionally a ring 27a mounted to move on its surface, biased forwardly by a spring 27b and holding the piercing element 9 by means of balls 27c trapped in housings 27d, this ring 27a being able to move back on the thrust of the operator against the spring 27b to release the piercing element 9 .
  • the piston 7 is hollow, being slidably mounted in the cylinder 5, this piston being intended to be pushed brutally towards the piercing element 9, under the pressure of the compressed air in the cylinder 5 and on its hollow head 7a, for shock him and allow the stitching effect of the hammer device.
  • the feeding device 11 of the cylinder comprises a supply valve 11b disposed in the extension of the main branch 21a of the handle, itself connected to a supply pipe 11c of compressed air at about 2 bars at its outer end .
  • This valve 11b is connected to the trigger 15b by a control rod 15c. The latter, closed, excluding actuation of the trigger, opens a supply channel 11d of compressed air to the dispensing portion 25 under the actuation of the control trigger 15b.
  • the dispensing portion 25 is conventional and comprises a pad 25a mounted to move back and forth on its seat 25b and alternately distributing the compressed air in the upper chamber 5a of the cylinder to push the piston 7 to the piercing element 9 or, conversely, feeding the lower part 5b of the cylinder by control channels 11th of the piston (visible at figures 2 and 4 ) to push the latter towards the upper part 5a of the cylinder to (the opposite of the piercing element).
  • the relief channels 11e mentioned above are two in number (one to several and of variable section depending on the space available in the housing) each formed laterally in the thickness of the half-shells 3a, parallel to the cylinder 5 and the lower level thereof. latest. These channels 11e are connected to the distribution portion 25 at its rear end and to the cylinder through holes 5c opening at its lower part 5b.
  • the exhaust device comprises a main part 13 housed in the front branch 21b of the handle, which is in the form of baffles for channeling the compressed air connected by holes 5d to the cylinder 5 and open at the end of this branch .
  • baffles extend longitudinally in the volume of the handle branch 21b. They allow the evacuation of compressed air at the outer end of the handle without inconvenience to the operator.
  • Another part of the exhaust device 13 ' is disposed in the front end portion of the half-shells 3a, opposite the handle 21. This part comprises small baffles connected to the lower part 5b of the cylinder by means of through holes 5e and is connected to the end of the half-shells 3a by holes 13'a opening outwards towards the piercing element 9.
  • an internal shaping of the half-shells 3a can be made near the dispensing portion 25 and the control trigger 15b, in a small space 28 around the cylinder 5 and lead the residual leak air (unavoidable) at the main exhaust part 13.
  • the compressed air arrives from the supply valve 11b open (according arrow), trigger 15b actuated, to the dispensing portion 25.
  • the compressed air is conveyed either in the cylinder chamber upper 5a to push the piston 7 towards the piercing element 9 with a striking effect, or it is driven in the opposite direction, at the end of the distribution part 25, to reach the two lower channels 11e at the lower level 5b of the cylinder and allow the recovery of the piston 7 for a new typing, according to a conventional operation of hammer piercing compressed air.
  • the piston 7 is high in the cylinder 5 (near the dispensing part 25), the pellet 25a being applied on its seat 25b to the left and closing the relief channels 11e, the compressed air arrives then directly into the upper cylinder chamber 5a and then suddenly pushes the piston 7, which is caused to pass through the exhaust holes 5d of the main exhaust part 13.
  • the pressure in the upper chamber 5a falls at the level of the atmospheric or near thrust, while the air of the upper chamber is evacuated by the main exhaust part 13.
  • the air cushion compressed by the arrival of the piston 7 between the piercing element 9 and the piston 7 is discharged by the front exhaust part 13 'to the piercing element 9, which prevents the piston being braked by this air cushion, in its stroke towards the piercing element 9.
  • the pellet 25a is then moved to its opposite position on its seat 25b, closing the compressed air inlet in the cylinder upper chamber 5a and opening the access to the relief channels 11e.
  • the compressed air then reaches the lower level 5b of the cylinder and raises the piston 7 to the upper level 5a of the cylinder for a new typing cycle.
  • low pressure compressed air has been used, but it is possible to supply the device with compressed air at high pressure (for example 7 bars) by adapting the sections of the feed, distribution, relief and exhaust.
  • the invention thus provides a simple jackhammer device, adaptable to a small size, lightweight and economical.

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

Abstract

Pneumatic drill device (1) comprising an external casing (3), an assembly consisting of a cylinder and a moving piston driving a bit (9), a device for supplying the cylinder with compressed air, an air exhaust device, and an operation control device, in which said external casing (3) is made up of two complementary parts (3a) able to be fitted together to enclose, besides the cylinder and piston assembly, the cylinder supply, air exhaust and operation control devices.

Description

On connaît les marteaux piqueurs à air comprimé à corps métalliques, généralement lourds et comportant une poignée de manoeuvre reliée au corps.Pneumatic jackhammers with metal bodies, generally heavy and having an operating handle connected to the body, are known.

Document FR 2 581 337 A décrit un dispositif de marteau piqueur à air comprimé selon le préambule de la revendication 1.Document FR 2 581 337 A discloses a pneumatic jackhammer device according to the preamble of claim 1.

Ces marteaux piqueurs ne se prêtent pas, en raison de leur dimensions et poids, à un piquage de finition ou avec peu d'accès. De plus, l'échappement d'air est évacué radialement sur le cylindre, ce qui peut gêner la préhension du cylindre du dispositif par l'utilisateur.These jackhammers do not lend themselves, because of their size and weight, to a finishing stitching or with little access. In addition, the exhaust air is discharged radially on the cylinder, which may hinder the gripping of the cylinder of the device by the user.

L'invention propose un dispositif de marteau piqueur à air comprimé comprenant un carter externe, un ensemble cylindre et piston mobile actionnant un élément piqueur, un dispositif d'alimentation du cylindre à air comprimé, un dispositif d'échappement d'air et un dispositif de commande de fonctionnement, caractérisé en ce que ledit carter externe est issu de deux parties complémentaires aptes à s'emboîter l'une à l'autre pour enfermer en plus de l'ensemble cylindre et piston lesdits dispositifs d'alimentation du cylindre, d'échappement d'air et de commande du fonctionnement et en ce que au moins un canal du dispositif d'alimentation et/ou du dispositif d'échappement est ménagé dans au moins une des parties de carter, ce canal étant formé latéralement dans l'épaisseur de la partie de carter, parallèlement au cylindre.The invention provides a pneumatic jackhammer device comprising an outer casing, a moving cylinder and piston assembly actuating a piercing element, a compressed air cylinder supply device, an air exhaust device and a device operating control device, characterized in that said outer casing is derived from two complementary parts adapted to fit one with the other to enclose in addition to the cylinder and piston assembly said cylinder supply devices, d air exhaust and control of the operation and in that at least one channel of the supply device and / or the exhaust device is formed in at least one of the housing parts, this channel being formed laterally in the thickness of the housing part, parallel to the cylinder.

Lesdits dispositifs d'alimentation, d'échappement et de commande enfermés sont avantageusement rigidement emprisonnés entre lesdites parties de carter, lesquelles sont montées serrées l'une contre l'autre et de façon étanche.Said enclosed supply, exhaust and control devices are advantageously rigidly trapped between said housing parts, which are mounted tight against each other and sealingly.

Lesdites parties de carter sont adaptées dans leur forme pour loger dans leur emboîtement lesdits dispositifs enfermés, lesquels sont ainsi pris en "sandwich" entre les deux parties de carter emboîtées.Said housing parts are adapted in their shape to accommodate in their interlocking said enclosed devices, which are thus sandwiched between the two nested housing parts.

Elles comportent avantageusement au moins une couche de matériau apte à isoler des vibrations et du bruit de fonctionnement de l'ensemble cylindre et piston.They advantageously comprise at least one layer of material capable of isolating vibrations and operating noise of the cylinder and piston assembly.

Elles sont avantageusement issues de moulage ou d'injection en matière synthétique, plastique par exemple, et de préférence adaptées à une mise en oeuvre d'un dispositif piqueur de petite taille et poids réduit, de préférence utilisant de l'air comprimé à basse pression, par exemple 0,5 à 2,5 bars, pour un piquage de finition ou avec peu d'accès.They are advantageously derived from molding or injection made of synthetic material, for example plastic, and preferably adapted to the use of a small and reduced weight lancing device, preferably using low pressure compressed air. , by example 0.5 to 2.5 bar, for finishing or with little access.

Au moins un canal du dispositif d'alimentation et/ou du dispositif d'échappement peut être ménagé dans au moins une des parties de carter, évitant ainsi la mise en oeuvre de tuyaux externes.At least one channel of the supply device and / or the exhaust device may be provided in at least one of the housing parts, thus avoiding the use of external pipes.

Les parties de carter sont avantageusement deux demi coques en matière plastique sensiblement symétriques l'une de l'autre par rapport à un plan médian longitudinal du dispositif de marteau piqueur et destinées à être montées serrées l'une à l'autre et de façon étanche, par exemple par un ensemble de vis disposées à leur périphérie. Les deux parties de carter peuvent ainsi être échangées aisément en cas d'usure ou de casse.The housing parts are advantageously two half-shells made of plastic substantially symmetrical to one another with respect to a longitudinal median plane of the hammer device and intended to be mounted tightly to one another and in a leak-tight manner for example by a set of screws arranged at their periphery. The two housing parts can thus be exchanged easily in case of wear or breakage.

Leur montage étanche est avantageusement assuré par un cordon périphérique d'une des parties s'écrasant au serrage dans une gorge correspondante de l'autre partie, et éventuellement sur un joint souple.Their sealed assembly is advantageously provided by a peripheral bead of one of the parts crashing in the clamping in a corresponding groove of the other part, and possibly on a flexible joint.

Lesdites parties de carter sont avantageusement formées avec au moins une poignée de manoeuvre du dispositif de marteau piqueur, laquelle intègre le dispositif de commande du fonctionnement (gâchette de commande).Said housing parts are advantageously formed with at least one operating handle of the jack hammer device, which integrates the operation control device (control trigger).

Ladite poignée peut être décalée de l'axe du cylindre et être en forme de D dont l'une des branches, la branche avant distincte de la branche principale arrière, protège la main de l'opérateur.Said handle may be offset from the axis of the cylinder and be D-shaped, one of whose branches, the front branch distinct from the main rear branch, protects the hand of the operator.

Ladite branche avant de la poignée peut loger au moins une partie du dispositif d'échappement d'air (par exemple une chicane), lequel s'évacue hors du cylindre, par exemple à l'extrémité externe de la poignée, sans interférence avec la main de l'opérateur.Said front branch of the handle can accommodate at least a part of the air exhaust device (for example a baffle), which is evacuated out of the cylinder, for example at the outer end of the handle, without interference with the hand of the operator.

La branche principale de manoeuvre de la poignée peut en outre intégrer le raccord de tuyauterie d'alimentation à son extrémité externe ainsi qu'une soupape d'alimentation reliée à la partie de commande (gâchette de commande).The main operating arm of the handle can further integrate the supply pipe connection at its outer end and a supply valve connected to the control portion (control trigger).

La partie d'extrémité avant des parties de carter, à l'opposé de la poignée, peut également loger au moins une autre partie d'échappement d'air (chicane d'échappement d'air), lequel s'évacue vers l'élément piqueur et donc sans gêne sur la prise de manoeuvre du carter.The front end part of the housing parts, opposite the handle, can also accommodate at least one other air exhaust part (air exhaust baffle), which evacuates towards the piercing element and therefore without hindrance on the handling of the crankcase.

En outre, un façonnage interne est réalisé dans les parties de carter pour collecter des fuites éventuelles d'air des dispositifs enfermés et les diriger sur le dispositif d'échappement d'air (fuites aux raccordements notamment).In addition, an internal shaping is performed in the housing parts to collect any air leakage of the enclosed devices and direct them on the air exhaust device (leakage connections in particular).

L'invention est illustrée ci-après à l'aide d'un exemple de réalisation et en référence aux dessins annexés, sur lesquels :

  • la figure 1 est une vue en perspective d'un dispositif de marteau piqueur selon l'invention,
  • la figure 2 est une vue en coupe transversale partielle du dispositif de marteau piqueur selon la ligne 2-2 de la figure 3,
  • la figure 3 est une vue en coupe axiale agrandie du dispositif de marteau piqueur,
  • la figure 4 est une vue en coupe longitudinale selon la ligne 4-4 de la figure 2 montrant les canaux de relève d'alimentation du dispositif de marteau piqueur, et
  • la figure 5 est une coupe transversale agrandie partielle montrant le raccordement des demi-coques de carter.
The invention is illustrated below with the aid of an exemplary embodiment and with reference to the appended drawings, in which:
  • the figure 1 is a perspective view of a jackhammer device according to the invention,
  • the figure 2 is a partial cross-sectional view of the jack hammer device along line 2-2 of the figure 3 ,
  • the figure 3 is an enlarged axial sectional view of the jackhammer device,
  • the figure 4 is a longitudinal sectional view along the line 4-4 of the figure 2 showing the feed relief channels of the jackhammer device, and
  • the figure 5 is a partial enlarged cross-section showing the connection of the crankcase half-shells.

Avec référence aux dessins, en particulier aux figures 1 et 3, le dispositif de marteau piqueur 1 selon l'invention comporte un carter externe 3, un ensemble cylindre 5 et piston mobile 7 actionnant un élément piqueur 9, un dispositif d'alimentation 11 du cylindre 5 en air comprimé, un dispositif d'échappement d'air 13 et un dispositif de commande de fonctionnement 15.With reference to the drawings, in particular figures 1 and 3 , the jackhammer device 1 according to the invention comprises an outer casing 3, a cylinder assembly 5 and movable piston 7 actuating a piercing element 9, a feed device 11 of the cylinder 5 with compressed air, an exhaust system of 13 and an operating control device 15.

Le carter externe 3 comporte deux demi-coques 3a assemblées l'une à l'autre selon un plan longitudinal médian du dispositif, étant serrées l'une contre l'autre au moyen de vis 17 disposées à leur périphérie.The outer casing 3 comprises two half-shells 3a assembled to one another along a median longitudinal plane of the device, being tightened against each other by means of screws 17 arranged at their periphery.

Ces demi-coques 3a, issues de moulage en matière plastique, enferment lesdits dispositifs d'alimentation 11, d'échappement 13 et de commande 15 du marteau piqueur, les emprisonnant rigidement dans des logements correspondants, respectivement 11a, 13a, 15a, formés lors de leur assemblage. Elles sont montées de façon étanche l'une à l'autre au moyen d'un joint de périphérie 19 constitué par un cordon périphérique 19a d'une demi-coque s'écrasant au serrage dans une gorge complémentaire 19b de l'autre (figure 5) et s'appuyant éventuellement sur un joint souple 19c de fond de la gorge. Les demi-coques 3a sont formées avec la poignée de manoeuvre 21 du dispositif de marteau piqueur, laquelle comprend la partie de commande ou gâchette de commande 15b du dispositif de marteau piqueur montée sur une branche principale arrière 21a de poignée du dispositif (à l'opposé de l'élément piqueur 9) protégée par une branche avant 21b reliée à la précédente en formant un D, en décalage axial du cylindre 5.These half-shells 3a, derived from plastic molding, enclose said supply devices 11, exhaust 13 and control 15 of the jackhammer, trapping them rigidly in corresponding housings, respectively 11a, 13a, 15a, formed during of their assembly. They are mounted in a sealed manner to one another by means of a periphery seal 19 constituted by a peripheral bead 19a of a half-shell crashing while being clamped in a complementary groove 19b of the other ( figure 5 ) and leaning possibly on a flexible joint 19c bottom of the groove. The half-shells 3a are formed with the operating handle 21 of the jack hammer device, which comprises the control portion or trigger 15b of the jack hammer device mounted on a rear main handle branch 21a of the device (at the opposite the piercing element 9) protected by a front branch 21b connected to the previous forming a D, axially offset cylinder 5.

L'ensemble cylindre 5 et piston 7 s'étend axialement sensiblement sur la longueur du corps 23 du dispositif de marteau. Le cylindre 5 loge de façon classique à sa partie arrière la partie de distribution 25 d'air comprimé, laquelle est reliée au dispositif d'alimentation 11 d'air comprimé monté dans la branche principale 21a de la poignée, et il comporte à sa partie avant la partie de prise de l'élément piqueur 9 ou décaleur à billes 27. Ce dernier est formé dans un prolongement axial avant agrandi 5' du cylindre, comportant de façon classique une bague 27a montée mobile à sa surface, rappelée vers l'avant par un ressort 27b et retenant l'élément piqueur 9 au moyen de billes 27c emprisonnées dans des logements 27d, cette bague 27a étant apte à reculer sur la poussée de l'opérateur à l'encontre du ressort 27b pour libérer l'élément piqueur 9.The cylinder 5 and piston 7 assembly extends axially substantially along the length of the body 23 of the hammer device. The cylinder 5 conventionally houses, at its rear part, the compressed air distribution section 25, which is connected to the compressed air supply device 11 mounted in the main branch 21a of the handle, and comprises in its part before the gripping portion of the piercing element 9 or ball stagger 27. The latter is formed in an enlarged axial extension before 5 'of the cylinder, comprising conventionally a ring 27a mounted to move on its surface, biased forwardly by a spring 27b and holding the piercing element 9 by means of balls 27c trapped in housings 27d, this ring 27a being able to move back on the thrust of the operator against the spring 27b to release the piercing element 9 .

Le piston 7 est creux, étant monté coulissant dans le cylindre 5, ce piston étant destiné à être repoussé brutalement vers l'élément piqueur 9, sous la pression de l'air comprimé dans le cylindre 5 et sur sa tête en creux 7a, pour lui imprimer des chocs et permettre l'effet de piquage du dispositif de marteau.The piston 7 is hollow, being slidably mounted in the cylinder 5, this piston being intended to be pushed brutally towards the piercing element 9, under the pressure of the compressed air in the cylinder 5 and on its hollow head 7a, for shock him and allow the stitching effect of the hammer device.

Le dispositif d'alimentation 11 du cylindre comporte une soupape d'alimentation 11b disposée dans le prolongement de la branche principale 21a de la poignée, elle-même raccordée à un tuyau d'alimentation 11c en air comprimé à 2 bars environ à son extrémité externe. Cette soupape 11b est reliée à la gâchette 15b par une tige de commande 15c. Celle-ci, fermée, hors actionnement de la gâchette, ouvre un canal d'alimentation 11d d'air comprimé à la partie de distribution 25 sous l'actionnement de la gâchette de commande 15b.The feeding device 11 of the cylinder comprises a supply valve 11b disposed in the extension of the main branch 21a of the handle, itself connected to a supply pipe 11c of compressed air at about 2 bars at its outer end . This valve 11b is connected to the trigger 15b by a control rod 15c. The latter, closed, excluding actuation of the trigger, opens a supply channel 11d of compressed air to the dispensing portion 25 under the actuation of the control trigger 15b.

La partie de distribution 25 est classique et comporte une pastille 25a montée mobile en va et vient sur son siège 25b et distribuant alternativement l'air comprimé dans la chambre supérieure 5a du cylindre en vue de repousser le piston 7 vers l'élément piqueur 9 ou, inversement, alimentant la partie inférieure 5b du cylindre par des canaux de commande relève 11e du piston (visibles aux figures 2 et 4) pour pousser ce dernier vers la partie supérieure 5a du cylindre à (l'opposé de l'élément piqueur).The dispensing portion 25 is conventional and comprises a pad 25a mounted to move back and forth on its seat 25b and alternately distributing the compressed air in the upper chamber 5a of the cylinder to push the piston 7 to the piercing element 9 or, conversely, feeding the lower part 5b of the cylinder by control channels 11th of the piston (visible at figures 2 and 4 ) to push the latter towards the upper part 5a of the cylinder to (the opposite of the piercing element).

Les canaux de relève 11e susmentionnés sont au nombre de deux (un à plusieurs et de section variable selon la place disponible dans le carter) formés chacun latéralement dans l'épaisseur des demi-coques 3a, parallèlement au cylindre 5 et au niveau inférieur de ce dernier. Ces canaux 11e sont reliés à la partie de distribution 25, à son extrémité arrière et au cylindre par des trous 5c débouchant au niveau de sa partie inférieure 5b.The relief channels 11e mentioned above are two in number (one to several and of variable section depending on the space available in the housing) each formed laterally in the thickness of the half-shells 3a, parallel to the cylinder 5 and the lower level thereof. latest. These channels 11e are connected to the distribution portion 25 at its rear end and to the cylinder through holes 5c opening at its lower part 5b.

Le dispositif d'échappement comporte une partie principale 13 logée dans la branche avant 21b de la poignée, laquelle est à forme de chicanes de canalisation de l'air comprimé reliées par des trous 5d au cylindre 5 et ouvertes à l'extrémité de cette branche. Ces chicanes s'étendent longitudinalement dans le volume de la branche 21b de poignée. Elles permettent l'évacuation de l'air comprimé à l'extrémité externe de la poignée sans gêne pour l'opérateur. Une autre partie du dispositif d'échappement 13' est disposée dans la partie d'extrémité avant des demi-coques 3a, à l'opposé de la poignée 21. Cette partie comporte de petites chicanes reliées à la partie inférieure 5b du cylindre par des trous traversants 5e et est reliée à l'extrémité des demi-coques 3a par des trous 13'a débouchant à l'extérieur vers l'élément piqueur 9.The exhaust device comprises a main part 13 housed in the front branch 21b of the handle, which is in the form of baffles for channeling the compressed air connected by holes 5d to the cylinder 5 and open at the end of this branch . These baffles extend longitudinally in the volume of the handle branch 21b. They allow the evacuation of compressed air at the outer end of the handle without inconvenience to the operator. Another part of the exhaust device 13 'is disposed in the front end portion of the half-shells 3a, opposite the handle 21. This part comprises small baffles connected to the lower part 5b of the cylinder by means of through holes 5e and is connected to the end of the half-shells 3a by holes 13'a opening outwards towards the piercing element 9.

Il est à noter qu'un façonnage interne des demi-coques 3a peut être réalisé à proximité de la partie de distribution 25 et de la gâchette de commande 15b, selon un faible espace 28 autour du cylindre 5 et mener l'air de fuite résiduel (inévitable) à la partie principale d'échappement 13.It should be noted that an internal shaping of the half-shells 3a can be made near the dispensing portion 25 and the control trigger 15b, in a small space 28 around the cylinder 5 and lead the residual leak air (unavoidable) at the main exhaust part 13.

Le fonctionnement du dispositif de marteau piqueur selon l'invention est à présent décrit en référence à la figure 3.The operation of the jack hammer device according to the invention is now described with reference to the figure 3 .

L'air comprimé arrive depuis la soupape d'alimentation 11b ouverte (selon flèche), gâchette 15b actionnée, vers la partie de distribution 25. Selon la position de la pastille mobile 25a, l'air comprimé est acheminé soit dans la chambre de cylindre supérieure 5a pour repousser le piston 7 vers l'élément piqueur 9 avec un effet de frappe, soit il est conduit dans la direction opposée, à l'extrémité de la partie de distribution 25, pour parvenir par les deux canaux de relève 11e au niveau inférieur 5b du cylindre et permettre la remontée du piston 7 en vue d'une nouvelle frappe, selon un fonctionnement classique de marteau piqueur à air comprimé.The compressed air arrives from the supply valve 11b open (according arrow), trigger 15b actuated, to the dispensing portion 25. Depending on the position of the movable chip 25a, the compressed air is conveyed either in the cylinder chamber upper 5a to push the piston 7 towards the piercing element 9 with a striking effect, or it is driven in the opposite direction, at the end of the distribution part 25, to reach the two lower channels 11e at the lower level 5b of the cylinder and allow the recovery of the piston 7 for a new typing, according to a conventional operation of hammer piercing compressed air.

Ainsi, supposons que le piston 7 soit au niveau haut dans le cylindre 5 (proche de la partie de distribution 25), la pastille 25a étant appliquée sur son siège 25b vers la gauche et fermant les canaux de relève 11e, l'air comprimé parvient alors directement dans la chambre de cylindre supérieure 5a et il repousse alors brutalement le piston 7, lequel est amené à dépasser les trous d'échappement 5d de la partie principale d'échappement 13. A ce niveau, la pression dans la chambre supérieure 5a chute au niveau de la poussée atmosphérique ou proche, tandis que l'air de la chambre supérieure s'évacue par la partie principale d'échappement 13. Simultanément, le coussin d'air comprimé par l'arrivée du piston 7 entre l'élément piqueur 9 et le piston 7 est évacué par la partie d'échappement avant 13' vers l'élément piqueur 9, ce qui empêche que le piston ne soit freiné par ce coussin d'air, dans sa course vers l'élément piqueur 9.Thus, suppose that the piston 7 is high in the cylinder 5 (near the dispensing part 25), the pellet 25a being applied on its seat 25b to the left and closing the relief channels 11e, the compressed air arrives then directly into the upper cylinder chamber 5a and then suddenly pushes the piston 7, which is caused to pass through the exhaust holes 5d of the main exhaust part 13. At this level, the pressure in the upper chamber 5a falls at the level of the atmospheric or near thrust, while the air of the upper chamber is evacuated by the main exhaust part 13. Simultaneously, the air cushion compressed by the arrival of the piston 7 between the piercing element 9 and the piston 7 is discharged by the front exhaust part 13 'to the piercing element 9, which prevents the piston being braked by this air cushion, in its stroke towards the piercing element 9.

La pastille 25a est alors déplacée à sa position opposée sur son siège 25b, fermant l'entrée d'air comprimé dans la chambre supérieure 5a de cylindre et ouvrant l'accès aux canaux de relève 11e. L'air comprimé parvient alors au niveau inférieur 5b du cylindre et remonte le piston 7 vers le niveau supérieur 5a du cylindre en vue d'un nouveau cycle de frappe.The pellet 25a is then moved to its opposite position on its seat 25b, closing the compressed air inlet in the cylinder upper chamber 5a and opening the access to the relief channels 11e. The compressed air then reaches the lower level 5b of the cylinder and raises the piston 7 to the upper level 5a of the cylinder for a new typing cycle.

Dans cet exemple, on a utilisé de l'air comprimé à basse pression mais il est possible d'alimenter le dispositif en air comprimé à haute pression (7 bars par exemple) en adaptant les sections des passages d'alimentation, de distribution, de relève et d'échappement.In this example, low pressure compressed air has been used, but it is possible to supply the device with compressed air at high pressure (for example 7 bars) by adapting the sections of the feed, distribution, relief and exhaust.

L'invention apporte ainsi un dispositif de marteau piqueur simple, adaptable à une petite taille, léger et économique.The invention thus provides a simple jackhammer device, adaptable to a small size, lightweight and economical.

Claims (14)

  1. Pneumatic hammer device (1) comprising an outer casing (3), an assembly comprising a cylinder (5) and movable piston (7) actuating a hammer element (9), a supply device (11) for supplying the cylinder (5) with compressed air, an air exhaust device (13) and an operation control device (15), wherein the said outer casing (3) is formed from two mating parts (3a) adapted to fit one inside the other to enclose, in addition to the cylinder (5) and piston (7) assembly, the said supply device (11) for the cylinder, the said air exhaust device (13) and operation control device (15), characterised in that at least one channel (11e) of the supply device (11) and/or of the exhaust device (13) is provided in at least one of the casing parts (3a), this channel being formed laterally within the thickness of the casing part (3a) parallel to the cylinder (5).
  2. Pneumatic hammer device (1) according to claim 1, characterised in that the said supply (11), exhaust (13) and control (15) devices enclosed are rigidly trapped between the said casing parts (3a), which are fitted together hermetically.
  3. Pneumatic hammer device (1) according to one of claims 1 and 2, characterised in that the said casing parts (3a) are adapted in shape to as to accommodate, within their interconnected portion, the said enclosed devices (11, 13, 15), which are thus sandwiched between the two interconnected casing parts (3a).
  4. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the said casing parts (3a) comprise at least one layer of material adapted to insulate the vibration and noise of operation of the assembly comprising the cylinder (5) and piston (7).
  5. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the said casing parts (3a) are formed by moulding from synthetic materials, for example plastics.
  6. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the said casing parts (3a) are adapted to the use of a small, lightweight hammer device for fine hammering or where access is restricted.
  7. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the casing parts (3a) are two half-shells (3a) made of plastics.
  8. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the hermetic fitting together of the casing parts (3a) is ensured by a peripheral bead (19a) belonging to one of the parts that is compressed when clamped in a corresponding groove (19b) in the other part, and optionally on a flexible joint (19c).
  9. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the said casing parts (3a) are formed with at least one operating handle (21) for the hammer device, which incorporates the operation control device (15) (control trigger 15b).
  10. Pneumatic hammer device (1) according to claim 9, characterised in that the handle (21) is offset from the axis of the cylinder and is D-shaped, one of its branches, the front branch (21 b), which is distinct from the main rear branch (21 a), protecting the operator's hand.
  11. Pneumatic hammer device (1) according to claim 10, characterised in that the front branch (212b) of the handle accommodates at least part (13) of the air exhaust device which discharges out of the cylinder, for example at the outer end of the handle (21), without interfering with the operator's hand.
  12. Pneumatic hammer device (1) according to one of claims 10 and 11, characterised in that the main operating branch (21 a) for the handle (21) incorporates a supply pipe connector (11c) at its outer end and a supply valve (11 b) connected to the control device (15).
  13. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that the front end part of the casing parts (3a) also accommodates at least one other air exhaust part (13') which discharges towards the hammer element (9), hence without adversely affecting the operating grip on the casing (3).
  14. Pneumatic hammer device (1) according to any one of the preceding claims, characterised in that internal shaping (28) is provided in the casing parts (3a) to collect any leaks of air from the enclosed devices (11, 13, 15) and direct them to the air exhaust device (13).
EP09706256A 2008-01-31 2009-01-30 Pneumatic hammer Not-in-force EP2244860B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0800528A FR2927010B1 (en) 2008-01-31 2008-01-31 COMPRESSED AIR PIECH HAMPER DEVICE
PCT/FR2009/050136 WO2009095623A2 (en) 2008-01-31 2009-01-30 Pneumatic drill device

Publications (2)

Publication Number Publication Date
EP2244860A2 EP2244860A2 (en) 2010-11-03
EP2244860B1 true EP2244860B1 (en) 2012-07-04

Family

ID=39720168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09706256A Not-in-force EP2244860B1 (en) 2008-01-31 2009-01-30 Pneumatic hammer

Country Status (5)

Country Link
US (1) US8540034B2 (en)
EP (1) EP2244860B1 (en)
ES (1) ES2396367T3 (en)
FR (1) FR2927010B1 (en)
WO (1) WO2009095623A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2927010B1 (en) 2008-01-31 2010-06-11 Sullair Europ COMPRESSED AIR PIECH HAMPER DEVICE
US9687978B2 (en) * 2012-08-02 2017-06-27 Ingersoll-Rand Company Variable speed control of fluid driven motors
TWI696526B (en) * 2016-04-12 2020-06-21 鑽全實業股份有限公司 A pneumatic tool with switching exhaust direction

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR689169A (en) * 1930-01-31 1930-09-03 Meudon Forges Atel Improvements to compressed air jackhammers
US3332504A (en) * 1964-05-18 1967-07-25 James V Lowery Impact tool
US3715705A (en) * 1971-03-29 1973-02-06 Thomas & Betts Corp Multicompartment connector
US3727700A (en) * 1971-04-19 1973-04-17 Chicago Pneumatic Tool Co Pneumatically percussive tool having a vibration free handle
US4071094A (en) * 1973-06-21 1978-01-31 Viktor Evdokimovich Kilin Portable pneumatic percussive tool
DE2820842A1 (en) * 1978-05-12 1979-11-22 Sig Schweiz Industrieges PNEUMATICALLY ACTIVATED STRIKING DEVICE
US4189917A (en) * 1978-09-18 1980-02-26 Kent Air Tool Company Air hammer and muffler combination
US4327807A (en) * 1978-09-19 1982-05-04 Maco-Meudon Percussion tool casing
EP0015700B1 (en) * 1979-02-28 1982-07-28 CompAir Construction and Mining Limited Compressed-gas-operated reciprocating-piston devices
FR2487241A1 (en) * 1980-07-25 1982-01-29 Maco Meudon Sa ANTI-FROZEN DEVICE FOR PNEUMATIC TOOLS
FR2554752B1 (en) * 1983-11-10 1986-12-26 Charbonnages De France SOUNDPROOFING HOUSING FOR PNEUMATIC DRILLING HAMMER
FR2581337A1 (en) * 1985-05-02 1986-11-07 Sorelem Improvements to jack hammers
US5419404A (en) * 1990-05-23 1995-05-30 Bretec Oy Hydraulic impact hammer
US5524715A (en) * 1994-07-29 1996-06-11 Ingersoll-Rand Company Throttle lever system for a fluid-activated, percussive paving breaker
WO2000076731A1 (en) * 1999-06-10 2000-12-21 Macdonald Air Tools Limited Pneumatic tool
FR2808719B1 (en) * 2000-05-15 2002-09-20 Sullair Europ GRIPPING SYSTEM OF A PERCUSSION APPARATUS IN PARTICULAR
FR2927010B1 (en) 2008-01-31 2010-06-11 Sullair Europ COMPRESSED AIR PIECH HAMPER DEVICE

Also Published As

Publication number Publication date
FR2927010B1 (en) 2010-06-11
WO2009095623A3 (en) 2009-10-08
FR2927010A1 (en) 2009-08-07
WO2009095623A2 (en) 2009-08-06
US20110155406A1 (en) 2011-06-30
EP2244860A2 (en) 2010-11-03
ES2396367T3 (en) 2013-02-21
US8540034B2 (en) 2013-09-24

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