EP1314517A1 - Fastening tool with a piston driven by compressed gas - Google Patents

Fastening tool with a piston driven by compressed gas Download PDF

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Publication number
EP1314517A1
EP1314517A1 EP02292868A EP02292868A EP1314517A1 EP 1314517 A1 EP1314517 A1 EP 1314517A1 EP 02292868 A EP02292868 A EP 02292868A EP 02292868 A EP02292868 A EP 02292868A EP 1314517 A1 EP1314517 A1 EP 1314517A1
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EP
European Patent Office
Prior art keywords
orifice
chamber
duct
gas
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02292868A
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German (de)
French (fr)
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EP1314517B1 (en
Inventor
Bruno Toulouse
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.)
Societe de Prospection et dInventions Techniques SPIT SAS
Original Assignee
Societe de Prospection et dInventions Techniques SPIT SAS
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Publication date
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Publication of EP1314517A1 publication Critical patent/EP1314517A1/en
Application granted granted Critical
Publication of EP1314517B1 publication Critical patent/EP1314517B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure

Definitions

  • the invention relates to a tampon fixing apparatus with a motor piston propelled by gas, in particular combustion gases. It aims at particular a means improving combustion inside the chamber in which the gases are produced.
  • An apparatus of this type comprises an envelope which has the general shape of a pistol.
  • This envelope contains a small combustion engine internal which drives a buffer guide in a translational movement.
  • the buffer guide is integral with a piston propelled by a compressed gas which is the product of the combustion of a combustible gas in the adjoining combustion.
  • the gas mixture comprising air and gas fuel is created in the chamber and then ignited by a means appropriate ignition.
  • the gun includes a gas cartridge fuel housed for example in the handle.
  • we fire of buffer we send a metered quantity of combustible gas into the chamber, then the ignition means is energized.
  • the gas follows a course along the device from a metering valve, close to the gas cartridge, into the combustion chamber.
  • the gas is guided in a conduit, generally a thin tube, placed between the valve and the chamber.
  • this is achieved by incorporating a means creating a pressure drop between the part of the tube upstream of its end near the combustion chamber and the chamber itself, of so as to avoid, at least in part, the vaporization of the gas upstream of said end.
  • One such means consists of a narrowing of the tube at its end and the tube has at least one lateral opening.
  • the section of the orifice or of the orifices is at least 10% less than the cross-section of the duct.
  • FIG. 1 the rear end of the device 1 without its housing.
  • the piston 9 moves in translation in a cylinder 11 and is integral with a rod 13.
  • This rod presses at its other end, not shown, on a propellant pad.
  • a fan 15 is mounted inside the chamber 5 and has the function to activate the gas mixture. It is driven by a motor 17 housed in the cylinder head 7. Its axis of rotation is here located in the extension of the rod 13.
  • the gas mixture is ignited by a means which is not shown and which is located at the cylinder head, behind the fan.
  • a gas injection pipe or tube opens into the combustion. Its axis is substantially parallel to that of the rod 13. It is connected at its other end, not visible in the figure, to the metering valve. This is arranged in a housing of the device provided for this purpose.
  • FIG. 2 shows an embodiment of the end 19A of the injection tube.
  • This end shows a first axial hole 191 which allows injection into the extension of the conduit 19 towards the fan blades. It also includes an orifice 192.
  • This orifice is placed on the wall of the tube 19 for a radial injection parallel to the plane piston 9. According to the invention, the total of the sections of the orifices is less than the section of the tube, so as to create a pressure drop between the tube and the combustion chamber.
  • the tube is closed at its end by a transverse wall and has only openings made on the wall, laterally.
  • a tube according to the invention was produced and the tube was replaced with a existing device, by the latter.
  • the narrowing of the duct section is therefore 15%.

Abstract

The device has a combustion chamber (5) formed between a piston (9) and a cylinder head (7). An injection duct (19) leads combustion gas into the chamber, through longitudinal and lateral orifices at one duct end (19A). A narrow portion is formed at the downstream side of the duct end, to facilitate pressure drop before the combustion gas is discharged through the longitudinal and lateral orifices.

Description

L'invention concerne un appareil de fixation de tampon avec un moteur à piston propulsé au gaz, notamment des gaz de combustion. Elle vise en particulier un moyen améliorant la combustion à l'intérieur de la chambre dans laquelle les gaz sont produits.The invention relates to a tampon fixing apparatus with a motor piston propelled by gas, in particular combustion gases. It aims at particular a means improving combustion inside the chamber in which the gases are produced.

Un appareil de ce type comprend une enveloppe qui a la forme générale d'un pistolet. Cette enveloppe contient un petit moteur à combustion interne qui entraíne un guide tampon dans un mouvement de translation. Le guide tampon est solidaire d'un piston propulsé par un gaz comprimé qui est le produit de la combustion d'un gaz combustible dans la chambre de combustion attenante. Le mélange gazeux comprenant l'air et le gaz combustible est créé dans la chambre puis enflammé par un moyen d'allumage approprié. Le pistolet comprend une cartouche de gaz combustible logée par exemple dans la poignée. Lorsqu'on déclenche le tir de tampon, on envoie une quantité dosée de gaz combustible dans la chambre, puis on met sous tension le moyen de mise à feu. Dans les appareils connus par la demanderesse, le gaz suit un parcours le long de l'appareil depuis une valve de dosage, proche de la cartouche de gaz, jusque dans la chambre de combustion. Le gaz est guidé dans un conduit, généralement un tube fin, disposé entre la valve et la chambre.An apparatus of this type comprises an envelope which has the general shape of a pistol. This envelope contains a small combustion engine internal which drives a buffer guide in a translational movement. The buffer guide is integral with a piston propelled by a compressed gas which is the product of the combustion of a combustible gas in the adjoining combustion. The gas mixture comprising air and gas fuel is created in the chamber and then ignited by a means appropriate ignition. The gun includes a gas cartridge fuel housed for example in the handle. When we fire of buffer, we send a metered quantity of combustible gas into the chamber, then the ignition means is energized. In the devices known to the applicant, the gas follows a course along the device from a metering valve, close to the gas cartridge, into the combustion chamber. The gas is guided in a conduit, generally a thin tube, placed between the valve and the chamber.

Avec les appareils que l'on rencontre sur le marché, on constate qu'entre le moment où l'on déclenche le tir et l'éjection effective du tampon, il se produit un retard conséquent. Ce délai peut être gênant lorsque l'opérateur est dans une position inconfortable et que l'appareil est susceptible de bouger.With the devices that we find on the market, we see that between the when the shot is fired and the buffer is effectively ejected, it produces a significant delay. This delay can be inconvenient when the operator is in an uncomfortable position and the device is likely to move.

La demanderesse s'est fixé comme objectif de réduire autant que possible ce temps de réaction.The applicant has set itself the objective of reducing as much as possible this reaction time.

Conformément à l'invention, on parvient à ce résultat en incorporant un moyen créant une perte de charge entre la partie du tube en amont de son extrémité proche de la chambre de combustion et la chambre elle-même, de manière à éviter, au moins en partie, la vaporisation du gaz en amont de ladite extrémité.According to the invention, this is achieved by incorporating a means creating a pressure drop between the part of the tube upstream of its end near the combustion chamber and the chamber itself, of so as to avoid, at least in part, the vaporization of the gas upstream of said end.

Un tel moyen est constitué d'un rétrécissement du tube à son extrémité et le tube comporte au moins un orifice latéral. One such means consists of a narrowing of the tube at its end and the tube has at least one lateral opening.

En effet, le gaz est normalement à l'état liquide dans la cartouche, et il subit une détente à la sortie de la valve de dosage. On a constaté avec surprise que si on retarde le moment de sa vaporisation avant son introduction dans la chambre, on réduit de manière sensible le temps mis par l'appareil à réagir à l'appui sur la queue de détente.This is because the gas is normally in the liquid state in the cartridge, and it undergoes an expansion at the outlet of the metering valve. We found with surprise that if we delay the moment of its vaporization before its introduction into the chamber, the time taken is significantly reduced by the device to react when the trigger on the trigger is pressed.

On explique ce résultat par le fait qu'il existe un lien entre la vaporisation du gaz à son passage à travers la valve de dosage, et le temps de chargement de la chambre de combustion. Dans les appareils de l'art antérieur le temps est relativement long. Au contraire avec la solution de l'invention, le gaz est propulsé en plus grande quantité et en un temps plus court du fait qu'il reste en partie à l'état liquide immédiatement en amont de l'orifice de pulvérisation. On réduit le temps de cycle de cette façon.This result is explained by the fact that there is a link between vaporization gas as it passes through the metering valve, and the time of loading the combustion chamber. In the devices of art the time is relatively long. On the contrary with the solution of the invention, the gas is propelled in greater quantity and in more time short because it remains partly in the liquid state immediately upstream spray hole. The cycle time is reduced in this way.

Conformément à une autre caractéristique, la section de l'orifice ou des orifices est inférieure d'au moins 10 % à la section du conduit.According to another characteristic, the section of the orifice or of the orifices is at least 10% less than the cross-section of the duct.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description qui suit, portant sur un mode de réalisation particulier de l'appareil, en référence aux dessins annexés sur lesquels

  • la figure 1 représente une vue partielle en coupe axiale de l'appareil
  • la figure 2 montre un exemple d'exécution de l'extrémité du tube d'alimentation de la chambre.
    • Other characteristics and advantages of the invention will appear on reading the description which follows, relating to a particular embodiment of the apparatus, with reference to the appended drawings in which
  • Figure 1 shows a partial view in axial section of the apparatus
  • Figure 2 shows an exemplary embodiment of the end of the chamber supply tube.

    • On voit sur la figure 1 l'extrémité arrière de l'appareil 1 sans son boítier. On reconnaít le manchon 3 de la chambre de combustion 5 fermée par une culasse 7 d'un côté et par un piston 9 de l'autre. Le piston 9 se déplace en translation dans un cylindre 11 et est solidaire d'une tige 13. Cette tige appuie à son autre extrémité, non représentée, sur un tampon à propulser. Un ventilateur 15 est monté à l'intérieur de la chambre 5 et a pour fonction d'activer le mélange des gaz. Il est entraíné par un moteur 17 logé dans la culasse 7. Son axe de rotation est ici situé dans le prolongement de la tige 13. Le mélange gazeux est mis à feu par un moyen qui n'est pas représenté et qui est situé au niveau de la culasse, en arrière du ventilateur.We see in Figure 1 the rear end of the device 1 without its housing. We recognize the sleeve 3 of the combustion chamber 5 closed by a cylinder head 7 on one side and by a piston 9 on the other. The piston 9 moves in translation in a cylinder 11 and is integral with a rod 13. This rod presses at its other end, not shown, on a propellant pad. A fan 15 is mounted inside the chamber 5 and has the function to activate the gas mixture. It is driven by a motor 17 housed in the cylinder head 7. Its axis of rotation is here located in the extension of the rod 13. The gas mixture is ignited by a means which is not shown and which is located at the cylinder head, behind the fan.

    Un conduit ou tube d'injection de gaz débouche dans la chambre de combustion. Son axe est sensiblement parallèle à celui de la tige 13. Il est relié à son autre extrémité, non visible sur la figure, à la valve de dosage. Celle-ci est disposée dans un logement de l'appareil prévu à cet effet. A gas injection pipe or tube opens into the combustion. Its axis is substantially parallel to that of the rod 13. It is connected at its other end, not visible in the figure, to the metering valve. This is arranged in a housing of the device provided for this purpose.

    On a représenté sur la figure 2 un mode de réalisation de l'extrémité 19A du tube d'injection. Cette extrémité montre un premier orifice 191 axial qui permet une injection dans le prolongement du conduit 19 en direction des pales du ventilateur. Elle comprend également un orifice 192. Cet orifice est placé sur la paroi du tube 19 pour une injection radiale parallèle au plan du piston 9. Conformément à l'invention, le total des sections des orifices est inférieur à la section du tube, de façon à créer une perte de charge entre le tube et la chambre de combustion.FIG. 2 shows an embodiment of the end 19A of the injection tube. This end shows a first axial hole 191 which allows injection into the extension of the conduit 19 towards the fan blades. It also includes an orifice 192. This orifice is placed on the wall of the tube 19 for a radial injection parallel to the plane piston 9. According to the invention, the total of the sections of the orifices is less than the section of the tube, so as to create a pressure drop between the tube and the combustion chamber.

    Selon un autre mode de réalisation, le tube est fermé à son extrémité par une paroi transversale et ne présente que des ouvertures pratiquées sur la paroi, latéralement.According to another embodiment, the tube is closed at its end by a transverse wall and has only openings made on the wall, laterally.

    On a réalisé un tube conforme à l'invention et on a remplacé le tube d'un appareil existant, par ce dernier.A tube according to the invention was produced and the tube was replaced with a existing device, by the latter.

    Les dimensions caractéristiques sont les suivantes :

  • Section interne du tube : 1,00 unité (de surface).
  • Section de l'orifice circulaire axial : 0,35 unité.
  • Section de l'orifice circulaire latéral : 0,50 unité.
    • The characteristic dimensions are as follows:
  • Internal section of the tube: 1.00 unit (area).
  • Section of the axial circular orifice: 0.35 units.
  • Section of the lateral circular orifice: 0.50 unit.

    • Le rétrécissement de la section du conduit est donc de 15 %.The narrowing of the duct section is therefore 15%.

    On a procédé à des essais comparatifs entre la solution de l'invention et celle de l'art antérieur. On a constaté que l'on avait ainsi pu passer d'une cadence de tir d'un coup par seconde à deux coups par seconde sans autre modification.Comparative tests were carried out between the solution of the invention and that of the prior art. We found that we had been able to go from one rate of fire from one shot per second to two shots per second with no other modification.

    Claims (5)

    Appareil de fixation de tampon, du type à piston (9) propulsé par gaz, comprenant une chambre de combustion (5) délimitée d'un côté par le piston et de l'autre par une culasse (7), avec un conduit (19) d'injection de gaz combustible débouchant par une extrémité (19A) dans la chambre, caractérisé par le fait que le conduit (19) comporte un orifice latéral (192) à son extrémité avec au moins un orifice latéral (192) à proximité de son extrémité avec une section rétrécie créant une perte de charge entre la partie du conduit (19) en amont de ladite extrémité (19A) et la chambre (5) elle-même, de manière à éviter, au moins en partie, la vaporisation du gaz combustible dans ladite partie du conduit en amont de l'extrémité.Buffer fixing device, of the piston type (9) propelled by gas, comprising a combustion chamber (5) delimited on one side by the piston and on the other by a cylinder head (7), with a duct (19 ) injecting combustible gas opening at one end (19A) into the chamber, characterized in that the duct (19) has a lateral orifice (192) at its end with at least one lateral orifice (192) near its end with a narrowed section creating a pressure drop between the part of the conduit (19) upstream of said end (19A) and the chamber (5) itself, so as to avoid, at least in part, the vaporization of the combustible gas in said part of the duct upstream from the end. Appareil selon la revendication précédente, le conduit comprenant un orifice axial (191) à son extrémité.Apparatus according to the preceding claim, the conduit comprising an axial orifice (191) at its end. Appareil selon l'une des revendications précédentes, la section de l'orifice ou des orifices étant inférieure, d'au moins 10 %, à la section du conduit.Apparatus according to one of the preceding claims, the section of the opening (s) being at least 10% less than the cross-section of the leads. Appareil selon l'une des revendications précédentes, comportant un ventilateur de mélange à l'intérieur de la chambre de combustion, le conduit comprenant au moins un orifice orienté de manière à diriger vers le ventilateur (15) au moins une partie des gaz combustibles injectés dans la chambre.Apparatus according to one of the preceding claims, comprising a mixing fan inside the combustion chamber, the duct comprising at least one orifice oriented so as to direct towards the fan (15) at least part of the combustible gases injected into the room. Appareil selon la revendication précédente, comprenant un second orifice dirigeant une partie des gaz combustibles dans une direction parallèle au plan du piston (9).Apparatus according to the preceding claim, comprising a second orifice directing part of the combustible gases in one direction parallel to the plane of the piston (9).
    EP02292868A 2001-11-21 2002-11-19 Fastening tool with a piston driven by compressed gas Expired - Lifetime EP1314517B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0115052 2001-11-21
    FR0115052A FR2832344B1 (en) 2001-11-21 2001-11-21 COMPRESSED GAS PISTON FIXING APPARATUS

    Publications (2)

    Publication Number Publication Date
    EP1314517A1 true EP1314517A1 (en) 2003-05-28
    EP1314517B1 EP1314517B1 (en) 2009-05-27

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP02292868A Expired - Lifetime EP1314517B1 (en) 2001-11-21 2002-11-19 Fastening tool with a piston driven by compressed gas

    Country Status (10)

    Country Link
    US (1) US6783046B2 (en)
    EP (1) EP1314517B1 (en)
    AT (1) ATE432150T1 (en)
    AU (1) AU2002302059B2 (en)
    CA (1) CA2412261C (en)
    DE (1) DE60232431D1 (en)
    DK (1) DK1314517T3 (en)
    ES (1) ES2327715T3 (en)
    FR (1) FR2832344B1 (en)
    NZ (1) NZ522704A (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US6892524B1 (en) * 2003-11-03 2005-05-17 Illinois Tool Works Inc. Latching mechanism for combustion chamber plate of a fastener driving tool
    US6966478B2 (en) * 2003-11-03 2005-11-22 Illinois Tool Works Inc Combustion apparatus having collapsible volume
    DE102008000167A1 (en) * 2008-01-29 2009-07-30 Hilti Aktiengesellschaft Internal combustion setting device

    Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4522162A (en) * 1981-01-22 1985-06-11 Signode Corporation Portable gas-powered tool with linear motor
    EP0424941A1 (en) * 1989-10-27 1991-05-02 Hitachi Koki Co., Ltd. Combustion gas powered fastener driving tool
    US6102270A (en) * 1995-11-27 2000-08-15 Illinois Tool Works Inc Fuel injection system for combustion-powered tool
    EP1093887A2 (en) * 1999-10-19 2001-04-25 HILTI Aktiengesellschaft Metering head, in particular for a combustion-driven fastener setting tool
    EP1093888A2 (en) * 1999-10-19 2001-04-25 HILTI Aktiengesellschaft Method and device for the driving of a piston of a combustion-driven working tool

    Family Cites Families (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5263439A (en) * 1992-11-13 1993-11-23 Illinois Tool Works Inc. Fuel system for combustion-powered, fastener-driving tool
    US6123241A (en) * 1995-05-23 2000-09-26 Applied Tool Development Corporation Internal combustion powered tool
    US5752643A (en) * 1995-05-23 1998-05-19 Applied Tool Development Corporation Internal combustion powered tool

    Patent Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4522162A (en) * 1981-01-22 1985-06-11 Signode Corporation Portable gas-powered tool with linear motor
    US4522162B1 (en) * 1981-01-22 1989-03-21
    EP0424941A1 (en) * 1989-10-27 1991-05-02 Hitachi Koki Co., Ltd. Combustion gas powered fastener driving tool
    US6102270A (en) * 1995-11-27 2000-08-15 Illinois Tool Works Inc Fuel injection system for combustion-powered tool
    EP1093887A2 (en) * 1999-10-19 2001-04-25 HILTI Aktiengesellschaft Metering head, in particular for a combustion-driven fastener setting tool
    EP1093888A2 (en) * 1999-10-19 2001-04-25 HILTI Aktiengesellschaft Method and device for the driving of a piston of a combustion-driven working tool

    Also Published As

    Publication number Publication date
    CA2412261C (en) 2005-06-14
    ES2327715T3 (en) 2009-11-03
    FR2832344A1 (en) 2003-05-23
    AU2002302059B2 (en) 2005-12-22
    US6783046B2 (en) 2004-08-31
    CA2412261A1 (en) 2003-05-21
    EP1314517B1 (en) 2009-05-27
    ATE432150T1 (en) 2009-06-15
    FR2832344B1 (en) 2004-01-23
    DK1314517T3 (en) 2009-09-07
    DE60232431D1 (en) 2009-07-09
    NZ522704A (en) 2003-08-29
    US20030094148A1 (en) 2003-05-22

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