EP1314517B1 - 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
EP1314517B1
EP1314517B1 EP02292868A EP02292868A EP1314517B1 EP 1314517 B1 EP1314517 B1 EP 1314517B1 EP 02292868 A EP02292868 A EP 02292868A EP 02292868 A EP02292868 A EP 02292868A EP 1314517 B1 EP1314517 B1 EP 1314517B1
Authority
EP
European Patent Office
Prior art keywords
duct
chamber
gas
piston
section
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
Application number
EP02292868A
Other languages
German (de)
French (fr)
Other versions
EP1314517A1 (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 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 buffer attachment apparatus with a piston engine propelled by gas, in particular combustion gases.
  • gas in particular combustion gases.
  • it relates to a means of improving the combustion inside the chamber in which the gases are produced.
  • An apparatus of this type includes an envelope that has the general shape of a pistol.
  • This envelope contains a small internal combustion engine that drives a buffer guide in a translational motion.
  • 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 adjacent combustion chamber.
  • the gaseous mixture comprising the air and the combustible gas is created in the chamber and then ignited by a suitable ignition means.
  • the gun comprises a fuel gas cartridge housed for example in the handle.
  • When firing the buffer a metered quantity of fuel gas is sent into the chamber, and the firing means is then energized.
  • the gas follows a path along the apparatus from a metering valve, close to the gas cartridge, into the combustion chamber.
  • the gas is guided in a conduit, usually a thin tube, disposed between the valve and the chamber.
  • this result is achieved by incorporating a means creating a pressure drop between the portion of the tube upstream of its end close to the combustion chamber and the chamber itself, so as to avoid, at least in part, the vaporization of the gas upstream of said end.
  • Such means consists of a narrowing of the tube at its end and the tube has at least one lateral orifice.
  • the gas is normally in the liquid state in the cartridge, and it undergoes a relaxation at the outlet of the metering valve.
  • the time of its vaporization is delayed before it is introduced into the chamber, the time taken by the apparatus to react to the pressure on the trigger rod is substantially reduced.
  • the section of the orifice or orifices is at least 10% less than the section of the conduit.
  • a fan 15 is mounted inside the chamber 5 and has the function of activating 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 of the cylinder head, behind the fan.
  • a conduit or tube 19 for gas injection opens into the combustion chamber 5. 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 apparatus provided for this purpose
  • this end 19A of the injection tube shows a first axial orifice 191 which allows an injection in the extension of the duct 19 in the direction of the fan blades. It also comprises an orifice 192. This orifice is placed on the wall of the tube 19 for radial injection parallel to the plane of the piston 9. According to the invention, the total of the sections of the orifices is smaller than the section of the tube, so 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 made and the tube of an existing apparatus was replaced by the latter.
  • the narrowing of the duct section is therefore 15%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
  • Telephone Function (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)

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 buffer attachment apparatus with a piston engine propelled by gas, in particular combustion gases. In particular, it relates to a means of improving the 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 entraîne 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, la 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 includes an envelope that has the general shape of a pistol. This envelope contains a small internal combustion engine that drives a buffer guide in a translational motion. 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 adjacent combustion chamber. The gaseous mixture comprising the air and the combustible gas is created in the chamber and then ignited by a suitable ignition means. The gun comprises a fuel gas cartridge housed for example in the handle. When firing the buffer, a metered quantity of fuel gas is sent into the chamber, and the firing means is then energized. In the apparatus known to the applicant, the gas follows a path along the apparatus from a metering valve, close to the gas cartridge, into the combustion chamber. The gas is guided in a conduit, usually a thin tube, disposed 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 are found on the market, it is found that between the moment when firing is launched and the effective ejection of the buffer, there is a consequent delay. This delay can be troublesome 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 goal of reducing this reaction time as much as possible.

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 result is achieved by incorporating a means creating a pressure drop between the portion of the tube upstream of its end close to the combustion chamber and the chamber itself, 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.Such means consists of a narrowing of the tube at its end and the tube has at least one lateral orifice.

Bien que le document EP 1 093 388 enseigne un appareil à gaz avec un conduit d'injection de gaz à orifices latéraux, il n'est question dans ce document ni de rétrécissement du tube ni surtout de perte de charge évitant la vaporisation du gaz.Although the document EP 1 093 388 teaches a gas appliance with a side-opening gas injection duct, there is no mention in this document of shrinkage of the tube or, above all, of pressure drop avoiding vaporization of the gas.

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.Indeed, the gas is normally in the liquid state in the cartridge, and it undergoes a relaxation at the outlet of the metering valve. Surprisingly, it has been found that if the time of its vaporization is delayed before it is introduced into the chamber, the time taken by the apparatus to react to the pressure on the trigger rod is substantially reduced.

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 the vaporization of the gas as it passes through the metering valve, and the loading time of the combustion chamber. In the apparatus of the prior art the time is relatively long. On the contrary, with the solution of the invention, the gas is propelled in greater quantity and in a shorter time because it remains partly in the liquid state immediately upstream of the spray orifice. 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 feature, the section of the orifice or orifices is at least 10% less than the section of the conduit.

D'autres caractéristiques et avantages de l'invention apparaîtront 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 et
  • la figure 2 montre un exemple d'exécution de l'extrémité du tube d'alimentation de la chambre.
Other features 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
  • the figure 1 represents a partial view in axial section of the apparatus and
  • the figure 2 shows an example of execution of the end of the supply tube of the chamber.

On voit sur la figure 1 l'extrémité arrière de l'appareil 1 sans son boîtier. On reconnaît 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.We see on the figure 1 the rear end of the apparatus 1 without its housing. It is recognized the sleeve 3 of the combustion chamber 5 closed by a cylinder head 7 on one side and by a piston 9 of the other. The piston 9 moves in translation in a cylinder 11 and is integral with a rod 13. This rod supports at its other end, not shown, on a pad to be propelled.

Un ventilateur 15 est monté à l'intérieur de la chambre 5 et a pour fonction d'activer le mélange des gaz. Il est entraîné 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.A fan 15 is mounted inside the chamber 5 and has the function of activating 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 of the cylinder head, behind the fan.

Un conduit ou tube19 d'injection de gaz débouche dans la chambre de combustion 5. 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 a cet effetA conduit or tube 19 for gas injection opens into the combustion chamber 5. 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 apparatus 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.We have shown on the figure 2 an embodiment of the end 19A of the injection tube this end shows a first axial orifice 191 which allows an injection in the extension of the duct 19 in the direction of the fan blades. It also comprises an orifice 192. This orifice is placed on the wall of the tube 19 for radial injection parallel to the plane of the piston 9. According to the invention, the total of the sections of the orifices is smaller than the section of the tube, so 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 made and the tube of an existing apparatus was replaced 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 (surface).
  • Section of the axial circular orifice: 0.35 unit.
  • 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. It was found that we had been able to go from a firing rate of one shot per second to two shots per second without further modification.

Claims (4)

  1. Device for securing a plug, of the type involving a piston (9) propelled by gas, comprising a combustion chamber (5) delimited on one side by the piston and on the other side by a cylinder head (7) with a duct (19) for injecting combustible gas open via one end (19A) into the chamber, characterized in that the duct (19), which comprises an axial orifice (191) at its end, comprises a lateral orifice (192) near its end with a narrowed section creating a pressure drop between the part of the duct (19) upstream of the said end (19A) and the chamber (5) itself, so as to at least partially avoid the vaporizing of the combustible gas in the said part of the duct upstream of the end.
  2. Device according to Claim 1, the cross section of the orifices being at least 10% smaller than the cross section of the duct.
  3. Device according to either of Claims 1 and 2, comprising a blower for mixing inside the combustion chamber, the duct (19) comprising at least one of the said orifices (192) oriented in such a way as to direct at least some of the combustible gases injected into the chamber towards the blower (15).
  4. Device according to Claim 3 comprising a second of the said orifices (191) directing some of the combustible gases in a 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 EP1314517A1 (en) 2003-05-28
EP1314517B1 true EP1314517B1 (en) 2009-05-27

Family

ID=8869625

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
US6966478B2 (en) * 2003-11-03 2005-11-22 Illinois Tool Works Inc Combustion apparatus having collapsible volume
US6892524B1 (en) * 2003-11-03 2005-05-17 Illinois Tool Works Inc. Latching mechanism for combustion chamber plate of a fastener driving tool
DE102008000167A1 (en) * 2008-01-29 2009-07-30 Hilti Aktiengesellschaft Internal combustion setting device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN157475B (en) * 1981-01-22 1986-04-05 Signode Corp
EP0424941B1 (en) * 1989-10-27 1994-01-05 Hitachi Koki Co., Ltd. Combustion gas powered fastener driving tool
US5263439A (en) * 1992-11-13 1993-11-23 Illinois Tool Works Inc. Fuel system for combustion-powered, fastener-driving tool
US5752643A (en) * 1995-05-23 1998-05-19 Applied Tool Development Corporation Internal combustion powered tool
US6123241A (en) * 1995-05-23 2000-09-26 Applied Tool Development Corporation Internal combustion powered tool
US5680980A (en) * 1995-11-27 1997-10-28 Illinois Tool Works Inc. Fuel injection system for combustion-powered tool
DE19950345C2 (en) * 1999-10-19 2003-06-05 Hilti Ag Method and device for driving a piston of an internal combustion-powered working device, in particular a setting device for fastening elements
DE19950350C2 (en) * 1999-10-19 2002-06-20 Hilti Ag Dosing head, in particular for setting tools operated by internal combustion engines

Also Published As

Publication number Publication date
US20030094148A1 (en) 2003-05-22
CA2412261C (en) 2005-06-14
DK1314517T3 (en) 2009-09-07
DE60232431D1 (en) 2009-07-09
ES2327715T3 (en) 2009-11-03
ATE432150T1 (en) 2009-06-15
EP1314517A1 (en) 2003-05-28
CA2412261A1 (en) 2003-05-21
FR2832344A1 (en) 2003-05-23
FR2832344B1 (en) 2004-01-23
AU2002302059B2 (en) 2005-12-22
US6783046B2 (en) 2004-08-31
NZ522704A (en) 2003-08-29

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