EP1289715B1 - Compact pneumatic hammer - Google Patents
Compact pneumatic hammer Download PDFInfo
- Publication number
- EP1289715B1 EP1289715B1 EP01934082A EP01934082A EP1289715B1 EP 1289715 B1 EP1289715 B1 EP 1289715B1 EP 01934082 A EP01934082 A EP 01934082A EP 01934082 A EP01934082 A EP 01934082A EP 1289715 B1 EP1289715 B1 EP 1289715B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hammer
- cylinder
- air chamber
- hammer according
- handle
- 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 - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
- B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
Definitions
- the invention relates to a pneumatic hammer having a small footprint.
- Pneumatic one-shot hammers are well known in the art.
- the body typically comprises an inner cylinder and an outer shell between which there is an air reserve chamber.
- a piston or a pair of spaced pistons mounted on an axial shaft whose front end forms the striker can move in the cylinder under the effect of compressed air stored in the chamber.
- the chamber is itself placed in communication with a source of compressed air, when the trigger is actuated, by a pipe connecting a connection provided on the hammer to said source of compressed air.
- the reserve of air between the cylinder and the envelope must have a volume large enough for the hammer to work well.
- the one-shot pneumatic hammer is a tool that has been designed for this purpose. This tool is used to hit the fasteners holding plastic parts (shields, door bins ...) present in cars. By a simple percussion it allows to release the plastic parts virgin of any other material.
- the dismantling tools are modeled and the car design incorporates the space that will be needed for the tool to be used.
- the constraints it imposes today during the design are important given the size of the tool.
- the present invention aims to satisfy this need.
- the present invention relates to a pneumatic hammer comprising a single body comprising a cylinder and a casing surrounding the cylinder and leaving between them a first air chamber, a hollow handle integral with said body and housing a second air chamber communicating with the first, at least one piston mounted on an axial shaft whose front end forms the striker and can move in the cylinder under the effect of compressed air stored in the air chambers, and means for actuating the hammer controlled by a trigger, said hammer being connected to a flexible hose connecting one of said chambers to a source of compressed air, characterized in that the rear part of the hammer is formed by the hollow handle whose internal cavity forms a second air chamber communicating with the first air chamber.
- the handle is mounted at the rear of the body.
- the handle has, seen from the side, the general shape of an inverted U, one of whose branches is secured to a rear face of the body.
- the hose connects the second air chamber to the source of compressed air.
- the envelope surrounding the rear portion of the cylinder has a cross section decreasing from the back to the front of the hammer.
- the necessarily reduced volume of the first air chamber is compensated, resulting from the fact that the envelope does not extend around the anterior part of the cylinder, by the second air chamber formed in the handle, on the one hand, and by the additional air chamber in the oversized end section of the hose, on the other hand.
- the front part of the cylinder is no longer surrounded by an envelope, the front portion of the hammer is much less bulky than in the case where the entire cylinder is surrounded by an envelope as in the hammers of the art prior.
- the figure 1 illustrates a pneumatic hammer of known type marketed by the American company PNEUTEK.
- This hammer comprises a body 1 comprising a cylinder 2 and an outer casing 3 surrounding the cylinder and leaving between them an air chamber 4.
- a pair of pistons 5, 6 secured on a shaft 7 of which anterior end 8, itself slidably mounted in a nose 9, forms the striker.
- the hammer may be connected by the connector 10 to a flexible hose 11 connected to a source of compressed air (not shown) so as to continuously supply compressed air to the chamber 4.
- the hammer comprises, in addition, a handle 12 and a trigger 13 whose pressing controls the actuation of the hammer, that is to say the rapid forward movement of the pair of pistons and, therefore, the striking of the striker. The release of this trigger causes the displacement in the opposite direction of the piston and, therefore, the return of the firing pin.
- Such a hammer is bulky and heavy.
- the figure 2 illustrates a hammer according to the present invention.
- the outer shell 3 surrounds only the rear portion 2b of the cylinder 2 and leaves bare the front portion 2a of the cylinder, which is about 0.5 times the total length of said cylinder.
- the envelope 3 surrounding the rear portion is profiled, having a cross section decreasing from the rear to the front of the hammer.
- the rear part of the hammer is formed by a hollow handle 22 whose internal cavity forms a second air chamber 23 communicating with the chamber 4 by passages 24.
- the handle 22 has, from the side, the general shape of an inverted U and is secured to the rear face of the body 1 by one branches of the U, as shown. This arrangement at the rear of the handle helps to clear the front of the hammer and, therefore, increases its ability to penetrate areas of poor accessibility.
- the hammer also has a trigger 25 for controlling its operation.
- Said trigger 25 is fixed inside the U formed by the handle 22, on the wall opposite to the gripping zone.
- the handle 22 is, moreover, connected to its base, by means of a screw connection 26, to a flexible hose 27 which can be connected to a source of compressed air (not shown).
- This flexible pipe 27 has the particularity of having a terminal section 28 adjacent to the handle 22, of oversized cross section relative to the section of the remainder of the pipe.
- the oversized terminal section of the flexible pipe may have an internal diameter of 10 to 30 mm while, over the rest of its length, the pipe conventionally has an internal diameter of 5 to 10 mm.
- the length of the oversized terminal section may be, for example, 50 to 150 mm.
- This oversized section 28 forms an additional air chamber 29 immediately adjacent and communicating with the chamber 23.
- the air chambers 23 and 29 serve to compensate for the reduced volume of the chamber 4 and allow satisfactory operation of the hammer. Room 23 would be insufficient on its own to
- the invention makes it possible to produce a lighter hammer and especially much less bulky than the hammers of the prior art, which allows to use it in places that would be inaccessible to the latter.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
L'invention concerne un marteau pneumatique présentant un encombrement réduit.The invention relates to a pneumatic hammer having a small footprint.
Les marteaux pneumatiques monocoup sont bien connus dans la technique.Pneumatic one-shot hammers are well known in the art.
Il sont constitués d'un corps et d'une poignée, et d'une gâchette commandant l'actionnement du marteau coup par coup. Le corps comprend typiquement un cylindre interne et une enveloppe externe entre lesquels se trouve une chambre formant réserve d'air. Un piston ou une paire de pistons espacés montés sur un arbre axial dont l'extrémité antérieure forme le percuteur peut se déplacer dans le cylindre sous l'effet d'air comprimé emmagasiné dans la chambre. La chambre est elle-même mise en communication avec une source d'air comprimé, lorsque la gâchette est actionnée, par un tuyau reliant un raccord prévu sur le marteau à ladite source d'air comprimé. La réserve d'air ménagée entre le cylindre et l'enveloppe doit avoir un volume assez important pour que le marteau fonctionne bien.It consists of a body and a handle, and a trigger controlling the actuation of the hammer blow by blow. The body typically comprises an inner cylinder and an outer shell between which there is an air reserve chamber. A piston or a pair of spaced pistons mounted on an axial shaft whose front end forms the striker can move in the cylinder under the effect of compressed air stored in the chamber. The chamber is itself placed in communication with a source of compressed air, when the trigger is actuated, by a pipe connecting a connection provided on the hammer to said source of compressed air. The reserve of air between the cylinder and the envelope must have a volume large enough for the hammer to work well.
Les caractéristiques du préambule de la revendication 1 sont connues de
Dans le domaine du recyclage des voitures automobiles la recherche d'outils afin d'optimiser les processus de démontage des voitures en terme de temps et de coût est une préoccupation constante. Le marteau pneumatique monocoup est un outil qui a été conçu dans cette optique. Cet outil est utilisé pour percuter les fixations retenant les pièces plastiques (boucliers; bacs de porte...) présentes dans les voitures. Par une simple percussion il permet de libérer les pièces plastiques vierges de tout autre matériau.In the field of car recycling, the search for tools to optimize the dismantling of cars in terms of time and cost is a constant concern. The one-shot pneumatic hammer is a tool that has been designed for this purpose. This tool is used to hit the fasteners holding plastic parts (shields, door bins ...) present in cars. By a simple percussion it allows to release the plastic parts virgin of any other material.
Pendant la phase de conception des véhicules les outils de démontage sont modélisés et la conception des voitures intègre l'espace qui sera nécessaire pour que l'outil puisse être utilisé. En ce qui concerne le marteau monocoup, les contraintes qu'il impose aujourd'hui lors de la conception sont importantes étant donné l'encombrement de l'outil.During the vehicle design phase the dismantling tools are modeled and the car design incorporates the space that will be needed for the tool to be used. As regards the single-hammer hammer, the constraints it imposes today during the design are important given the size of the tool.
De plus le poids du marteau (typiquement environ 4 kg) le rend difficile d'utilisation et donc peu pratique pour les opérateurs.In addition the weight of the hammer (typically about 4 kg) makes it difficult to use and therefore impractical for operators.
Pour limiter, voire supprimer, l'importante contrainte imposée par le marteau pneumatique monocoup, on a besoin de disposer d'un tel outil moins encombrant que ceux actuellement disponibles. La présente invention vise à satisfaire ce besoin.To limit or even eliminate the important constraint imposed by the pneumatic hammer single shot, one needs to have such a tool less bulky than those currently available. The present invention aims to satisfy this need.
Plus particulièrement la présente invention concerne un marteau pneumatique monocoup comprenant un corps comportant un cylindre et une enveloppe entourant le cylindre et ménageant entre eux une première chambre à air, une poignée creuse solidaire dudit corps et abritant une deuxième chambre à air communiquant avec la première, au moins un piston monté sur un arbre axial dont l'extrémité antérieure forme le percuteur et pouvant se déplacer dans le cylindre sous l'effet d'air comprimé emmagasiné dans les chambres à air, et des moyens d'actionnement du marteau commandé par une gâchette, ledit marteau étant raccordé à un tuyau flexible reliant une desdites chambres à une source d'air comprimé, caractérisé en ce que la partie arrière du marteau est formée par la poignée creuse dont la cavité interne forme une deuxième chambre à air communiquant avec la première chambre à air.More particularly, the present invention relates to a pneumatic hammer comprising a single body comprising a cylinder and a casing surrounding the cylinder and leaving between them a first air chamber, a hollow handle integral with said body and housing a second air chamber communicating with the first, at least one piston mounted on an axial shaft whose front end forms the striker and can move in the cylinder under the effect of compressed air stored in the air chambers, and means for actuating the hammer controlled by a trigger, said hammer being connected to a flexible hose connecting one of said chambers to a source of compressed air, characterized in that the rear part of the hammer is formed by the hollow handle whose internal cavity forms a second air chamber communicating with the first air chamber.
Selon un mode de réalisation préféré, la poignée est montée à l'arrière du corps.According to a preferred embodiment, the handle is mounted at the rear of the body.
De préférence, la poignée présente, vue de côté, la forme générale d'un U inversé, dont l'une des branches est solidaire d'une face arrière du corps. De préférence aussi, le tuyau flexible relie la deuxième chambre à air à la source d'air comprimé.Preferably, the handle has, seen from the side, the general shape of an inverted U, one of whose branches is secured to a rear face of the body. Also preferably, the hose connects the second air chamber to the source of compressed air.
De préférence également, l'enveloppe entourant la partie postérieure du cylindre présente une section transversale allant en diminuant de l'arrière vers l'avant du marteau.Also preferably, the envelope surrounding the rear portion of the cylinder has a cross section decreasing from the back to the front of the hammer.
Selon l'invention, on compense le volume nécessairement réduit de la première chambre à air, résultant du fait que l'enveloppe ne s'étend pas autour de la partie antérieure du cylindre, par la deuxième chambre à air ménagée dans la poignée, d'une part, et par la chambre à air supplémentaire ménagée dans le tronçon terminal surdimensionné du tuyau flexible, d'autre part.According to the invention, the necessarily reduced volume of the first air chamber is compensated, resulting from the fact that the envelope does not extend around the anterior part of the cylinder, by the second air chamber formed in the handle, on the one hand, and by the additional air chamber in the oversized end section of the hose, on the other hand.
Etant donné que la partie antérieure du cylindre n'est plus entourée d'une enveloppe, la portion avant du marteau est beaucoup moins encombrante que dans le cas où la totalité du cylindre est entourée d'une enveloppe comme dans les marteaux de l'art antérieur.Since the front part of the cylinder is no longer surrounded by an envelope, the front portion of the hammer is much less bulky than in the case where the entire cylinder is surrounded by an envelope as in the hammers of the art prior.
Enfin, selon d'autres caractéristiques de l'invention :
- la gâchette est fixée articulée sur la partie arrière dudit marteau, à l'intérieur du U formé par la poignée.
- l'enveloppe entourant la partie postérieure du cylindre présente une section transversale allant en diminuant de la partie arrière du corps vers la partie antérieure du cylindre,
- la partie antérieure du cylindre est laissée à nu sur une longueur d'au moins 0,4 fois la longueur dudit cylindre, et
- la longueur du cylindre est égale à au moins une fois le diamètre extérieur dudit cylindre.
- the trigger is fixed articulated on the rear part of said hammer, inside the U formed by the handle.
- the envelope surrounding the rear part of the cylinder has a cross section decreasing from the rear part of the body towards the front part of the cylinder,
- the anterior part of the cylinder is left exposed for a length of at least 0.4 times the length of said cylinder, and
- the length of the cylinder is equal to at least once the outer diameter of said cylinder.
La description qui va suivre, en regard des dessins annexés, donnée à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être réalisée.
- La
figure 1 est une vue schématique en coupe longitudinale d'un marteau pneumatique monocoup selon l'art antérieur ; et - La
figure 2 est une vue schématique, partiellement en coupe longitudinale d'un marteau pneumatique monocoup conforme à l'invention.
- The
figure 1 is a schematic longitudinal sectional view of a single-shot pneumatic hammer according to the prior art; and - The
figure 2 is a schematic view, partially in longitudinal section of a pneumatic hammer monocouple according to the invention.
Il est à noter que les moyens d'actionnement du marteau, c'est-à-dire les divers organes et circuits pneumatiques internes permettant le fonctionnement du marteau, ne font pas partie de l'invention, étant connus en eux-mêmes. Pour plus de détails concernant l'agencement interne du marteau et son mode de fonctionnement, on pourra se reporter notamment aux brevets américains
De ce fait, la structure interne et le fonctionnement détaillé du marteau pneumatique ne seront pas décrits ici.As a result, the internal structure and the detailed operation of the pneumatic hammer will not be described here.
La
Ce marteau comporte un corps 1 comportant un cylindre 2 et une enveloppe externe 3 entourant le cylindre et ménageant entre eux une chambre à air 4. Dans le cylindre 2 est montée coulissante une paire de pistons 5, 6 assujettis sur un arbre 7 dont l'extrémité antérieure 8, elle-même montée coulissante dans un nez 9, forme le percuteur. Le marteau peut être connecté par le raccord 10 à un tuyau flexible 11 relié à une source d'air comprimé (non représentée) de façon à alimenter en air comprimé, en continu, la chambre 4. Le marteau comprend, en outre, une poignée 12 et une gâchette 13 dont le pressage commande l'actionnement du marteau, c'est-à-dire le déplacement rapide vers l'avant de la paire de pistons et, donc, la frappe du percuteur. Le relâchement de cette gâchette provoque le déplacement en sens contraire du piston et, donc, le retour du percuteur.This hammer comprises a body 1 comprising a
Un tel marteau est encombrant et lourd.Such a hammer is bulky and heavy.
La
Dans ce marteau, l'enveloppe externe 3 n'entoure plus que la partie postérieure 2b du cylindre 2 et laisse à nu la partie antérieure 2a du cylindre, laquelle représente environ 0,5 fois la longueur totale dudit cylindre. De plus, l'enveloppe 3 entourant la partie postérieure est profilée, présentant une section transversale allant en diminuant de l'arrière vers l'avant du marteau. La partie arrière du marteau est formée par une poignée 22 creuse dont la cavité interne forme une deuxième chambre à air 23 communiquant avec la chambre 4 par des passages 24. La poignée 22 présente, vue de côté, la forme générale d'un U renversé et est solidaire de la face arrière du corps 1 par l'une des branches du U, comme représenté. Cette disposition à l'arrière de la poignée contribue à dégager la partie avant du marteau et, donc, accroît son aptitude à pénétrer dans des endroits d'accessibilité médiocre.In this hammer, the
Le marteau comporte également une gâchette 25 servant à commander son fonctionnement. Ladite gâchette 25 est fixée à l'intérieur du U formé par la poignée 22, sur la paroi opposée à la zone de préhension. La poignée 22 est, par ailleurs, connectée à sa base, par le moyen d'un raccord vissé 26, à un tuyau flexible 27 pouvant être relié à une source d'air comprimé (non représentée). Ce tuyau flexible 27 présente la particularité d'avoir un tronçon terminal 28 adjacent à la poignée 22, de section transversale surdimensionnée par rapport à la section du reste du tuyau. A titre indicatif, le tronçon terminal surdimensionné du tuyau flexible peut présenter un diamètre interne de 10 à 30 mm alors que, sur le reste de sa longueur, le tuyau a classiquement un diamètre interne de 5 à 10 mm. La longueur du tronçon terminal surdimensionné peut être, par exemple, de 50 à 150 mm. Ce tronçon surdimensionné 28 forme une chambre à air supplémentaire 29 immédiatement adjacente et communicante avec la chambre 23. Les chambres à air 23 et 29 servent à compenser le volume réduit de la chambre 4 et permettent un fonctionnement satisfaisant du marteau. La chambre 23 serait insuffisante à elle seule pour obtenir ce résultat.The hammer also has a
L'invention permet de produire un marteau plus léger et surtout beaucoup moins encombrant que les marteaux de l'art antérieur, ce qui permet de l'utiliser dans des endroits qui seraient inaccessibles à ces derniers. A titre indicatif, on a pu construire un marteau dont le diamètre de la partie antérieure était de seulement 64 mm, à comparer à un diamètre de 120 mm pour un marteau du genre de celui de la
Il va de soi que le mode de réalisation décrit n'est qu'un exemple et qu'on pourrait le modifier, notamment par substitution d'équivalents technique, sans sortir pour cela du cadre de l'invention.It goes without saying that the embodiment described is only one example and that it could be modified, in particular by substitution of technical equivalents, without departing from the scope of the invention.
Claims (10)
- Single-stroke pneumatic hammer comprising a body (1) which includes a cylinder (2) and a casing (3) surrounding the cylinder (2) and forming between them a first air chamber (4), a hollow handle (22) secured to the said body (1), at least one piston (5, 6) which is mounted on an axial shaft (7), the anterior end (8) of which forms the striker, and which can move in the cylinder (2) under the effect of compressed air stored in the air chambers, and means for actuating the hammer which are controlled by a trigger (25), the said hammer being connected to a flexible hose (27) which links it to a compressed air source, characterized in that the rear portion of the hammer is formed by the hollow handle (22), the internal cavity of which forms a second air chamber (23) communicating with the first air chamber (4).
- Hammer according to Claim 1, characterized in that the handle (22) has, as seen from the side, the general shape of an inverted U, one of the branches of which is secured to a rear face of the body (1).
- Hammer according to either one of the preceding claims, characterized in that the secondary air chamber (23) has the general shape of an L.
- Hammer according to any one of the preceding claims, characterized in that the flexible hose (27) has, at its end connected to the hammer, an oversized section forming an additional air chamber (29) for the hammer.
- Hammer according to any one of the preceding claims, characterized in that the oversized section (29) has a length of 50 to 150 mm.
- Hammer according to any one of the preceding claims, characterized in that the oversized section (29) has a diameter of 10 to 30 mm.
- Hammer according to Claims 1 and 2, characterized in that the trigger (25) is pivot-mounted on the rear portion of the said hammer, inside the U formed by the handle (22).
- Hammer according to any one of the preceding claims, characterized in that the casing (3) surrounding the posterior portion (2b) of the cylinder (2) has a cross section which decreases progressively from the rear portion of the body towards the anterior portion (2a) of the cylinder (2).
- Hammer according to any one of the preceding claims, characterized in that the anterior portion (2a) of the cylinder (2) is left exposed over a length of at least 0.4 times the length of the said cylinder (2).
- Hammer according to any one of the preceding claims, characterized in that the length of the cylinder (2) is equal to at least one times the outside diameter of the said cylinder (2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0005949A FR2808717B1 (en) | 2000-05-10 | 2000-05-10 | REDUCED PNEUMATIC HAMMER |
| FR0005949 | 2000-05-10 | ||
| PCT/FR2001/001418 WO2001085397A1 (en) | 2000-05-10 | 2001-05-10 | Compact pneumatic hammer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1289715A1 EP1289715A1 (en) | 2003-03-12 |
| EP1289715B1 true EP1289715B1 (en) | 2008-07-02 |
Family
ID=8850062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01934082A Expired - Lifetime EP1289715B1 (en) | 2000-05-10 | 2001-05-10 | Compact pneumatic hammer |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1289715B1 (en) |
| DE (1) | DE60134642D1 (en) |
| ES (1) | ES2305074T3 (en) |
| FR (1) | FR2808717B1 (en) |
| WO (1) | WO2001085397A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2471604A (en) * | 1947-03-07 | 1949-05-31 | Charles F Boyer | Safety device for pneumatic tools |
| BE536815A (en) * | 1954-03-26 | |||
| GB826644A (en) * | 1955-11-14 | 1960-01-13 | Modernair Corp | Pneumatically operated fastener driving machine |
| FR1498705A (en) * | 1966-10-04 | 1967-10-20 | Bostitch Inc | Pneumatic driving tool |
-
2000
- 2000-05-10 FR FR0005949A patent/FR2808717B1/en not_active Expired - Fee Related
-
2001
- 2001-05-10 WO PCT/FR2001/001418 patent/WO2001085397A1/en active IP Right Grant
- 2001-05-10 DE DE60134642T patent/DE60134642D1/en not_active Expired - Lifetime
- 2001-05-10 ES ES01934082T patent/ES2305074T3/en not_active Expired - Lifetime
- 2001-05-10 EP EP01934082A patent/EP1289715B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1289715A1 (en) | 2003-03-12 |
| FR2808717B1 (en) | 2002-07-12 |
| DE60134642D1 (en) | 2008-08-14 |
| FR2808717A1 (en) | 2001-11-16 |
| WO2001085397A1 (en) | 2001-11-15 |
| ES2305074T3 (en) | 2008-11-01 |
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Inventor name: LASSARTESSES, ROBERT Inventor name: BUQUET, LOUISE |
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| RBV | Designated contracting states (corrected) |
Designated state(s): BE DE ES FR GB IT |
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| 17Q | First examination report despatched |
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