EP2106883B1 - Fuel driven fastener - Google Patents

Fuel driven fastener Download PDF

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Publication number
EP2106883B1
EP2106883B1 EP09154393.4A EP09154393A EP2106883B1 EP 2106883 B1 EP2106883 B1 EP 2106883B1 EP 09154393 A EP09154393 A EP 09154393A EP 2106883 B1 EP2106883 B1 EP 2106883B1
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EP
European Patent Office
Prior art keywords
piston
combustion chamber
pump
setting tool
sensor
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EP09154393.4A
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German (de)
French (fr)
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EP2106883A1 (en
Inventor
Christian Hahn
Rolf Erhardt
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Hilti AG
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Hilti AG
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    • 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 present patent application relates to a combustion-powered setting tool referred to in the preamble of claim 1. Art.
  • Such a setting device is in EP0291545 disclosed.
  • Such setting tools can be operated with gaseous or vaporizable liquid fuels that are burned in a combustion chamber, thereby driving a driving piston for fasteners. After the setting process, the drive piston must be returned to its original position near the combustion chamber, so that the setting device is ready for another setting process.
  • the object of the present invention is therefore to develop a setting tool of the aforementioned type, which allows a low-wear and reliable piston return.
  • the means for resetting the drive piston includes a pump which generates or at least amplifies the differential pressure for piston return.
  • the pump may be the only source for generating the differential pressure or it may amplify a thermally generated differential pressure.
  • the pump is designed as an electrical suction pump connected to the combustion chamber for generating a suction air flow, whereby a negative pressure can be generated in the combustion chamber, so that the pressure applied to the combustion chamber side facing away from the piston head ambient pressure can reset the drive piston in its initial position.
  • control unit for the pump, which controls the pump based on data determined by means of sensor means, whereby the pump can be operated efficiently and energy-saving.
  • the sensor means include a piston sensor which detects the position of the driving piston, so that a reset of the driving piston is detectable and so the control unit can turn off the pump after the reset.
  • the sensor means include a temperature sensor, so that the control unit only turns on the pump if the temperature difference between the device or combustion chamber temperature and the ambient temperature has a specific value falls below, so that a complete piston return is ensured. This measure also ensures high energy efficiency of the piston return device.
  • an electrically controllable shut-off valve is arranged, which is controlled by the control unit.
  • the check valve is closed by the control unit when the drive piston is again in its initial position, so that during a setting process, the pressure wave generated in the combustion chamber does not strike through to the pump and damage it.
  • the control unit can also at the end of a setting process, which z. B. detected via the piston sensor or determined by timing, causing an opening of the check valve, so that the pump is connected to the combustion chamber and can suck gases from the combustion chamber to generate a negative pressure there.
  • the invention is shown in one embodiment.
  • the drawing shows an inventive setting device in partial sectional view.
  • the setting device 10 shown in the figure can be operated with a fuel gas or with a vaporizable liquid fuel, and has a, arranged in a housing 13 setting network. About the network, a fastener, such as a nail, bolts, etc. are driven into a workpiece W when the setting tool 10 with its bolt guide 16, pressed against a workpiece W, and is triggered.
  • a trigger switch 42 is provided on the handle of the setting device 10 in addition to at least one safety switch in the form of a contact pressure switch.
  • the setting mechanism includes, inter alia, a combustion chamber 11, a piston guide 17, in which a drive piston 15 is slidably mounted, and the bolt guide 16 in which a fastener can be performed, and where a fastener moves over the forward moving Setzidess workede end of the drive piston 15, and can be driven into a workpiece W.
  • the bolt guide 16 closes in the setting direction of the piston guide 17.
  • the drive piston 15 has at its end facing the combustion chamber 11 a piston head 115 in the form of a piston plate, which is sealingly guided on the inner walls of the piston guide 17 and which separates a first space and a second space from each other in an axial direction defined by the piston.
  • an ignition device 14 such as. B. a spark plug, for igniting a, introduced for a setting process in the combustion chamber 11 oxidant-fuel mixture.
  • the supply of the fuel into the combustion chamber or into the combustion chamber 11 takes place via a fuel supply 19 from a fuel reservoir 12 or a fuel source.
  • a metering device 18 such as a mechanical or electronic metering valve arranged.
  • the fuel supply to the combustion chamber 11 z. B. be controlled by a not reproduced here mechanical or electronic control device.
  • an ignition via the ignition device 14, which ignites the air-fuel mixture in the combustion chamber 11, is triggered via the trigger switch 42.
  • the displaced by the driving piston 15 air in the first space between the piston head 115 and the bolt guide 16 facing the end of the piston guide 17 can escape via the exhaust 41.
  • the expanding combustion gases from the combustion chamber 11 can also escape via the exhaust 41 as soon as the exhaust port is overrun by the piston head 115 and is in communication with the second space between the piston head 115 and the combustion chamber 11.
  • a pump 20 of the device for returning the driving piston 15 is also arranged.
  • This pump 20 is z. B. formed as a suction pump and includes a driven by an electric drive 21 piston 22 which runs in a cylinder 23. About a connecting rod 24, the piston 22 is mechanically connected to the electric drive 21.
  • the electrical energy for the electric drive 21 is supplied from an existing in the setting device 10 electrical energy source 32, the z. B. is designed as an accumulator or battery.
  • the pump 20 communicates via a line 27 with the combustion chamber 11, wherein in the line 27, a check valve 28 is interposed, which is electrically controlled by a control unit 30, which also controls the pump 20.
  • the check valve 28 closes in a blocking position shown in the figure, the line 27 and are in an open position, the pneumatic communication between the combustion chamber 11 and the pump 20 free.
  • the cylinder 23 of the pump 20 has an inlet 36 into which the conduit 27 opens and an outlet 35 to the environment, are discharged via the sucked gases from the combustion chamber 11 to the environment.
  • the entry of gases into the cylinder 23 enabling valve means 26 is arranged, which blocks in the opposite direction and prevents leakage of air or gases from the cylinder 23 into the combustion chamber 11.
  • the outflow of air or gases from the cylinder 23 enabling valve means 25 is arranged, which blocks in the opposite direction and prevents an inflow of ambient air into the cylinder 23.
  • the control unit 30 is connected to sensor means which comprise at least one piston sensor 31 for detecting the piston position and preferably at least one temperature sensor 33 for determining a temperature difference between the device or combustion chamber temperature and the ambient temperature.
  • the control unit 30 controls both the pump 20 and the check valve 28 on the basis of measured data from the piston sensor 31 and the temperature sensor 33.
  • the control unit 30 starts the pump 20 when an ambient temperature is determined by the temperature sensor which is so high that a determined temperature Difference temperature from the combustion chamber temperature and the ambient temperature falls below a set limit and the piston sensor 31 determines that the drive piston 15 is not in its initial position.
  • the control unit 30 then further causes the check valve 28 to go to the open position to allow communication between the combustion chamber 11 and the pump 20.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Die vorliegende Patentanmeldung betrifft ein brennkraftbetriebenes Setzgerät der im Oberbegriff des Patentanspruchs 1 genannten Art.The present patent application relates to a combustion-powered setting tool referred to in the preamble of claim 1. Art.

Ein solches Setzgerät ist in EP0291545 offenbart.Such a setting device is in EP0291545 disclosed.

Derartige Setzgeräte können mit gasförmigen oder verdampfbaren flüssigen Brennstoffen betrieben werden, die in einer Brennkammer verbrannt werden und dabei einen Treibkolben für Befestigungselemente antreiben. Nach erfolgtem Setzvorgang muss der Treibkolben wieder in seine Ausgangsstellung nahe der Brennkammer zurückgestellt werden, damit das Setzgerät für einen weiteren Setzvorgang bereit ist.Such setting tools can be operated with gaseous or vaporizable liquid fuels that are burned in a combustion chamber, thereby driving a driving piston for fasteners. After the setting process, the drive piston must be returned to its original position near the combustion chamber, so that the setting device is ready for another setting process.

Aus der DE 195 09 763 A1 ist ein brennkraftbetriebenes Setzgerät mit einem in einer Kolbenführung versetzbar geführten Treibkolben bekannt, der durch die Treibladungsgase bewegt wird und mit seinem Kolbenschaft das Befestigungsmittel in den Untergrund eintreibt. Die Rückstellung des Treibkolbens in seine Ausgangsstellung erfolgt dabei mittels elastomerer Druck- oder Zugfedern.From the DE 195 09 763 A1 is a combustion-powered setting tool with a displaceably guided in a piston guide drive piston known, which is moved by the propellant charge gases and drives the fastener with its piston shaft into the ground. The provision of the driving piston in its initial position takes place by means of elastomeric pressure or tension springs.

Von Nachteil bei dieser bekannten Lösung ist jedoch, dass die elastomeren Federn verschleissanfällig sind, so dass der Treibkolben zum einen ab einem bestimmten Verschleissstadium nicht mehr vollständig in seine Ausgangsstellung zurückgeführt wird woraus sich Einbussen bei der zur Verfügung stehenden Setzenergie ergeben. Zum anderen können sich Partikel von den elastomeren Federn lösen, die zu Funktionsstörungen führen können.A disadvantage of this known solution, however, is that the elastomeric springs are susceptible to wear, so that the driving piston is not returned to a starting from a certain level of wear completely in its initial position resulting in losses at the available setting energy. On the other hand, particles can detach from the elastomeric springs, which can lead to malfunctions.

Aus der EP 0 056 989 A1 ist ein weiteres brennkraftbetriebenes Setzgerät mit einem in einer Kolbenführung versetzbar geführten Treibkolben bekannt, bei dem der Treibkolben über eine Druckdifferenz (bzw. einen Differentialdruck) zwischen dem Umgebungsdruck, der auf der der Brennkammer abgewandten Seite des Treibkolbens wirkt, und dem in der Brennkammer herrschenden Druck in seine Ausgangsstellung zurückgestellt wird.From the EP 0 056 989 A1 another combustion-powered setting tool is known with a displaceably guided in a piston guide drive piston, in which the drive piston via a pressure difference (or a differential pressure) between the ambient pressure, which acts on the side facing away from the combustion chamber of the driving piston, and prevailing in the combustion chamber pressure is returned to its original position.

Von Nachteil bei dieser bekannten Lösung ist, dass es zu Kolbenfehlständen kommen kann, wenn z. B. die Reibung des Treibkolbens durch Verschmutzung erhöht ist und der Treibkolben nicht mehr ganz in seine Ausgangsstellung zurückgeführt wird oder wenn durch eine zu geringe Temperaturdifferenz zwischen Umgebungstemperatur und Gerätetemperatur die Druckdifferenz nicht für eine vollständige Rückstellung des Treibkolbens ausreicht.The disadvantage of this known solution is that it can lead to piston malfunction when z. B. the friction of the drive piston is increased by contamination and the drive piston is not completely returned to its original position or if the pressure difference is not sufficient for a complete recovery of the drive piston by too low a temperature difference between ambient temperature and device temperature.

Die Aufgabe der vorliegenden Erfindung liegt daher darin, ein Setzgerät der vorgenannten Art zu entwickeln, das eine verschleissarme und zuverlässige Kolbenrückführung ermöglicht.The object of the present invention is therefore to develop a setting tool of the aforementioned type, which allows a low-wear and reliable piston return.

Die Aufgabe wird durch ein Setzgerät mit den in Patentanspruch 1 wiedergegebenen Massnahmen gelöst. Demnach beinhaltet die Einrichtung zur Rückstellung des Treibkolbens eine Pumpe, die den Differentialdruck zur Kolbenrückstellung erzeugt oder zumindest verstärkt. Durch diese Massnahme ist zum einen immer eine vollständige Kolbenrückstellung gewährleistet und zum anderen kann eine hohe Setzfrequenz auf Grund einer schnelleren Kolbenrückführung erzielt werden. Die Pumpe kann dabei die einzige Quelle zur Erzeugung des Differentialdrucks sein oder sie kann einen thermisch erzeugten Differentialdruck verstärken.The object is achieved by a setting device with the reproduced in claim 1 measures. Accordingly, the means for resetting the drive piston includes a pump which generates or at least amplifies the differential pressure for piston return. By this measure, on the one hand always ensures a complete piston return and on the other hand, a high set frequency can be achieved due to a faster piston recirculation. The pump may be the only source for generating the differential pressure or it may amplify a thermally generated differential pressure.

Erfindungsgemäß ist die Pumpe als mit der Brennkammer verbundene elektrische Saugpumpe zur Erzeugung eines Saugluftstroms ausgebildet, wodurch in der Brennkammer ein Unterdruck erzeugt werden kann, so dass der an der der Brennkammer abgewandten Seite des Kolbenkopfs anliegende Umgebungsdruck den Treibkolben in seine Ausgangsstellung zurückstellen kann.According to the invention, the pump is designed as an electrical suction pump connected to the combustion chamber for generating a suction air flow, whereby a negative pressure can be generated in the combustion chamber, so that the pressure applied to the combustion chamber side facing away from the piston head ambient pressure can reset the drive piston in its initial position.

Günstig ist es ausserdem, wenn eine Steuereinheit für die Pumpe vorgesehen ist, die die Pumpe anhand von, mittels Sensormitteln ermittelten Daten steuert, wodurch die Pumpe effizient und energiesparend betrieben werden kann.It is also favorable, if a control unit is provided for the pump, which controls the pump based on data determined by means of sensor means, whereby the pump can be operated efficiently and energy-saving.

Von Vorteil ist es dabei, wenn die Sensormittel einen Kolbensensor beinhalten, der die Position des Treibkolbens detektiert, so dass eine erfolgte Rückstellung des Treibkolbens detektierbar ist und so die Steuereinheit die Pumpe nach erfolgter Rückstellung abschalten kann.It is advantageous if the sensor means include a piston sensor which detects the position of the driving piston, so that a reset of the driving piston is detectable and so the control unit can turn off the pump after the reset.

Von Vorteil ist es ferner, wenn die Sensormittel einen Temperatursensor beinhalten, so dass die Steuereinheit die Pumpe nur einschaltet wenn die Temperaturdifferenz zwischen Geräte- bzw. Brennraumtemperatur und der Umgebungstemperatur einen bestimmten Wert unterschreitet, so dass eine vollständige Kolbenrückführung sichergestellt ist. Durch diese Massnahme wird ebenfalls eine hohe Energieeffizienz der Einrichtung zur Kolbenrückführung sichergestellt.It is also advantageous if the sensor means include a temperature sensor, so that the control unit only turns on the pump if the temperature difference between the device or combustion chamber temperature and the ambient temperature has a specific value falls below, so that a complete piston return is ensured. This measure also ensures high energy efficiency of the piston return device.

Günstig ist es auch, wenn zwischen der Pumpe und der Brennkammer ein elektrisch ansteuerbares Sperrventil angeordnet ist, welches über die Steuereinheit gesteuert ist. Das Sperrventil wird von der Steuereinheit geschlossen, wenn der Treibkolben sich wieder in seiner Ausgangslage befindet, so dass bei einem Setzvorgang die in der Brennkammer erzeugte Druckwelle nicht bis zur Pumpe durchschlägt und diese beschädigt. Die Steuereinheit kann ferner am Ende eines Setzvorgangs, welches z. B. über den Kolbensensor detektiert oder durch Zeitsteuerung ermittelt wird, ein Öffnen des Sperrventils veranlassen, so dass die Pumpe mit der Brennkammer verbunden ist und Gase aus der Brennkammer absaugen kann um dort einen Unterdruck zu erzeugen.It is also favorable if between the pump and the combustion chamber, an electrically controllable shut-off valve is arranged, which is controlled by the control unit. The check valve is closed by the control unit when the drive piston is again in its initial position, so that during a setting process, the pressure wave generated in the combustion chamber does not strike through to the pump and damage it. The control unit can also at the end of a setting process, which z. B. detected via the piston sensor or determined by timing, causing an opening of the check valve, so that the pump is connected to the combustion chamber and can suck gases from the combustion chamber to generate a negative pressure there.

In der Zeichnung ist die Erfindung in einem Ausführungsbeispiel dargestellt. Die Zeichnung zeigt dabei ein erfindungsgemässes Setzgerät in teilweiser Schnittansicht.In the drawing, the invention is shown in one embodiment. The drawing shows an inventive setting device in partial sectional view.

Das in der Figur dargestellte Setzgerät 10 kann mit einem Brenngas oder mit einem verdampfbaren Flüssigbrennstoff betrieben werden, und weist ein, in einem Gehäuse 13 angeordnetes Setzwerk auf. Über das Setzwerk kann ein Befestigungselement, wie ein Nagel, Bolzen, etc. in ein Werkstück W eingetrieben werden, wenn das Setzgerät 10 mit seiner Bolzenführung 16, an ein Werkstück W angepresst, und ausgelöst wird. Zum Auslösen eines Setzvorgangs ist neben wenigstens einem Sicherheitsschalter in Form eines Anpressschalters ein Triggerschalter 42 am Handgriff des Setzgerätes 10 vorgesehen.The setting device 10 shown in the figure can be operated with a fuel gas or with a vaporizable liquid fuel, and has a, arranged in a housing 13 setting network. About the network, a fastener, such as a nail, bolts, etc. are driven into a workpiece W when the setting tool 10 with its bolt guide 16, pressed against a workpiece W, and is triggered. To trigger a setting process, a trigger switch 42 is provided on the handle of the setting device 10 in addition to at least one safety switch in the form of a contact pressure switch.

Zum Setzwerk gehören u. a. eine Brennkammer 11 eine Kolbenführung 17, in der ein Treibkolben 15 verschieblich gelagert ist, und die Bolzenführung 16 in der ein Befestigungselement geführt werden kann, und wo ein Befestigungselement über das sich nach vorne bewegende setzrichtungsseitige Ende des Treibkolbens 15 bewegt, und in ein Werkstück W eingetrieben werden kann. Die Bolzenführung 16 schliesst sich dabei in Setzrichtung an die Kolbenführung 17 an. Der Treibkolben 15 weist an seinem der Brennkammer 11 zugewandten Ende einen als Kolbenteller ausgebildeten Kolbenkopf 115 auf, der dichtend an den Innenwänden der Kolbenführung 17 geführt ist und der in einer durch den Kolben definierten axialen Richtung einen ersten Raum und einen zweiten Raum voneinander trennt.The setting mechanism includes, inter alia, a combustion chamber 11, a piston guide 17, in which a drive piston 15 is slidably mounted, and the bolt guide 16 in which a fastener can be performed, and where a fastener moves over the forward moving Setzrichtungsseitige end of the drive piston 15, and can be driven into a workpiece W. The bolt guide 16 closes in the setting direction of the piston guide 17. The drive piston 15 has at its end facing the combustion chamber 11 a piston head 115 in the form of a piston plate, which is sealingly guided on the inner walls of the piston guide 17 and which separates a first space and a second space from each other in an axial direction defined by the piston.

In dem vorliegenden Ausführungsbeispiel ist in der Brennkammer 11 noch eine Zündeinrichtung 14, wie z. B. einer Zündkerze, zur Zündung eines, für einen Setzvorgang in die Brennkammer 11 eingebrachten Oxidationsmittel-Brennstoffgemischs vorgesehen. Die Zufuhr des Brennstoffes in den Brennraum bzw. in die Brennkammer 11 erfolgt dabei über eine Brennstoffzuführung 19 aus einem Brennstoffreservoir 12 bzw. einer Brennstoffquelle. In der Brennstoffzuführung 19 ist in dem vorliegenden Beispiel noch eine Dosiereinrichtung 18, wie z. B. ein mechanisches oder elektronisches Dosierventil, angeordnet. Über diese Dosiereinrichtung 18 kann die Brennstoffzufuhr zur Brennkammer 11 z. B. über eine hier nicht wiedergegebene mechanische oder elektronische Steuereinrichtung geregelt werden.In the present embodiment, in the combustion chamber 11 is still an ignition device 14, such as. B. a spark plug, for igniting a, introduced for a setting process in the combustion chamber 11 oxidant-fuel mixture. The supply of the fuel into the combustion chamber or into the combustion chamber 11 takes place via a fuel supply 19 from a fuel reservoir 12 or a fuel source. In the fuel supply 19 is still a metering device 18 such. As a mechanical or electronic metering valve arranged. About this metering device 18, the fuel supply to the combustion chamber 11 z. B. be controlled by a not reproduced here mechanical or electronic control device.

Bei einem Setzvorgang wird über den Triggerschalter 42 eine Zündung über die Zündeinrichtung 14 ausgelöst, die das Luft-Brennstoffgemisch in der Brennkammer 11 entzündet. Über die expandierenden Gase wird der Treibkolben 15 in Setzrichtung 40, d.h. in Richtung auf die Bolzenführung 16 bewegt. Die vom Treibkolben 15 verdrängte Luft in dem ersten Raum zwischen dem Kolbenkopf 115 und dem der Bolzenführung 16 zugewandten Ende der Kolbenführung 17 kann dabei über den Auspuff 41 entweichen. Die expandierenden Verbrennungsgase aus der Brennkammer 11 können ebenfalls über den Auspuff 41 entweichen, sobald die Auspufföffnung vom Kolbenkopf 115 überfahren wird und mit dem zweiten Raum zwischen Kolbenkopf 115 und Brennkammer 11 in Verbindung steht. Nach dem Austritt der Verbrennungsgase und dem Verschliessen des Auspuffs wird durch die Abkühlung der Brennkammer 11 bereits ein Differentialdruck zwischen dem ersten Raum auf der der Brennkammer 11 abgewandten Seite des Kolbenkopfs 115 und dem zweiten Raum auf der der Brennkammer 11 zugewandten Seite des Kolbenkopfs 115 erzeugt.During a setting process, an ignition via the ignition device 14, which ignites the air-fuel mixture in the combustion chamber 11, is triggered via the trigger switch 42. About the expanding gases of the driving piston 15 in the setting direction 40, i. moved in the direction of the bolt guide 16. The displaced by the driving piston 15 air in the first space between the piston head 115 and the bolt guide 16 facing the end of the piston guide 17 can escape via the exhaust 41. The expanding combustion gases from the combustion chamber 11 can also escape via the exhaust 41 as soon as the exhaust port is overrun by the piston head 115 and is in communication with the second space between the piston head 115 and the combustion chamber 11. After the exit of the combustion gases and the closing of the exhaust, a differential pressure between the first chamber on the side facing away from the combustion chamber 11 of the piston head 115 and the second chamber on the combustion chamber 11 facing side of the piston head 115 is already generated by the cooling of the combustion chamber 11.

In dem hier dargestellten Setzgerät 10 ist ferner noch eine Pumpe 20 der Einrichtung zur Rückstellung des Treibkolbens 15 angeordnet. Diese Pumpe 20 ist z. B. als Saugpumpe ausgebildet und umfasst einen über einen elektrischen Antrieb 21 angetriebenen Kolben 22, der in einem Zylinder 23 läuft. Über einen Pleuel 24 ist der Kolben 22 mit dem elektrischen Antrieb 21 mechanisch verbunden. Die elektrische Energie für den elektrischen Antrieb 21 wird aus einer im Setzgerät 10 vorhandenen elektrischen Energiequelle 32 geliefert, die z. B. als Akkumulator oder Batterie ausgebildet ist. Die Pumpe 20 kommuniziert über eine Leitung 27 mit der Brennkammer 11, wobei in der Leitung 27 ein Sperrventil 28 zwischengeschaltet ist, das über eine Steuereinheit 30 elektrisch gesteuert ist, die ebenfalls die Pumpe 20 steuert. So verschliesst das Sperrventil 28 in einer in der Figur dargestellten Sperrstellung die Leitung 27 und gibt in einer Öffnungsstellung die pneumatische Kommunikation zwischen der Brennkammer 11 und der Pumpe 20 frei.In the setting device 10 shown here, a pump 20 of the device for returning the driving piston 15 is also arranged. This pump 20 is z. B. formed as a suction pump and includes a driven by an electric drive 21 piston 22 which runs in a cylinder 23. About a connecting rod 24, the piston 22 is mechanically connected to the electric drive 21. The electrical energy for the electric drive 21 is supplied from an existing in the setting device 10 electrical energy source 32, the z. B. is designed as an accumulator or battery. The pump 20 communicates via a line 27 with the combustion chamber 11, wherein in the line 27, a check valve 28 is interposed, which is electrically controlled by a control unit 30, which also controls the pump 20. Thus, the check valve 28 closes in a blocking position shown in the figure, the line 27 and are in an open position, the pneumatic communication between the combustion chamber 11 and the pump 20 free.

Der Zylinder 23 der Pumpe 20 verfügt über einen Einlass 36 in den die Leitung 27 mündet und einen Auslass 35 zur Umgebung, über den angesaugte Gase aus der Brennkammer 11 an die Umgebung abgegeben werden. Am Einlass 36 ist ein, den Eintritt von Gasen in den Zylinder 23 ermöglichendes Ventilmittel 26 angeordnet, das in entgegengesetzter Richtung sperrt und ein Ausströmen von Luft bzw. Gasen aus dem Zylinder 23 in die Brennkammer 11 verhindert. Am Auslass 35 ist hingegen ein, das Ausströmen von Luft bzw. Gasen aus dem Zylinder 23 ermöglichendes Ventilmittel 25 angeordnet, das in entgegengesetzter Richtung sperrt und ein Einströmen von Umgebungsluft in den Zylinder 23 verhindert.The cylinder 23 of the pump 20 has an inlet 36 into which the conduit 27 opens and an outlet 35 to the environment, are discharged via the sucked gases from the combustion chamber 11 to the environment. At the inlet 36 a, the entry of gases into the cylinder 23 enabling valve means 26 is arranged, which blocks in the opposite direction and prevents leakage of air or gases from the cylinder 23 into the combustion chamber 11. At the outlet 35, however, a, the outflow of air or gases from the cylinder 23 enabling valve means 25 is arranged, which blocks in the opposite direction and prevents an inflow of ambient air into the cylinder 23.

Die Steuereinheit 30 ist mit Sensormitteln verbunden, die wenigstens einen Kolbensensor 31 zur Erfassung der Kolbenposition und vorzugsweise noch wenigstens einen Temperatursensor 33 zur Ermittlung einer Temperaturdifferenz zwischen Geräte- bzw. Brennraumtemperatur und der Umgebungstemperatur umfassen. Die Steuereinheit 30 steuert anhand von Messdaten des Kolbensensors 31 und des Temperatursensors 33 sowohl die Pumpe 20 als auch das Sperrventil 28. So startet die Steuereinheit 30 die Pumpe 20, wenn von dem Temperatursensor eine Umgebungstemperatur ermittelt wird, die so hoch ist, dass eine ermittelte Differenztemperatur aus Brennraumtemperatur und der Umgebungstemperatur einen gesetzten Grenzwert unterschreitet und der Kolbensensor 31 ermittelt, dass sich der Treibkolben 15 nicht in seiner Ausgangsstellung befindet. Die Steuereinheit 30 veranlasst dann ferner das Sperrventil 28 in die Öffnungsstellung zu gehen, um eine Kommunikation zwischen der Brennkammer 11 und der Pumpe 20 zu ermöglichen. Durch den von der Pumpe 20 erzeugten Saugstrom aus der Brennkammer 11 heraus wird der Differentialdruck zwischen den beiden Räumen zu beiden axialen Seiten des Kolbenkopfs 115 erhöht, so dass der Treibkolben 15 in seine Ausgangsstellung zurückkehrt. Der Treibkolben 15 wird quasi zur Brennkammer hin "angesaugt". Sobald vom Kolbensensor 31 ermittelt wird, dass sich der Treibkolben 15 wieder in seiner Ausgangsstellung befindet, schaltet die Steuereinheit 30 die Pumpe 20 ab und veranlasst das Sperrventil 28 in seine Sperrstellung (siehe Figur) zu gehen.The control unit 30 is connected to sensor means which comprise at least one piston sensor 31 for detecting the piston position and preferably at least one temperature sensor 33 for determining a temperature difference between the device or combustion chamber temperature and the ambient temperature. The control unit 30 controls both the pump 20 and the check valve 28 on the basis of measured data from the piston sensor 31 and the temperature sensor 33. Thus, the control unit 30 starts the pump 20 when an ambient temperature is determined by the temperature sensor which is so high that a determined temperature Difference temperature from the combustion chamber temperature and the ambient temperature falls below a set limit and the piston sensor 31 determines that the drive piston 15 is not in its initial position. The control unit 30 then further causes the check valve 28 to go to the open position to allow communication between the combustion chamber 11 and the pump 20. By the suction flow generated by the pump 20 from the combustion chamber 11, the differential pressure between the two spaces is increased to both axial sides of the piston head 115, so that the driving piston 15 returns to its original position. The driving piston 15 is quasi "sucked" to the combustion chamber. As soon as it is determined by the piston sensor 31 that the drive piston 15 is again in its initial position, the control unit 30 shuts off the pump 20 and causes the check valve 28 to move into its blocking position (see FIG.

Claims (5)

  1. Combustion-powered setting tool (10) for driving fastening elements into a workpiece, comprising
    at least one combustion chamber (11) for a fuel and a drive piston (15) which is guided displaceably in a piston guide (17) and has a piston head (115), the drive piston (15) being propellable by means of expanding gases from the combustion chamber (11),
    and an arrangement for restoring the drive piston (15) to a starting position by means of a differential pressure between chambers on the two axial sides of the piston head (115),
    characterised in that
    the arrangement for restoring the drive piston (15) comprises an electrical suction pump, connected to the combustion chamber (11), for generating a suction air flow.
  2. Setting tool according to Claim 1, characterised in that a control unit (30) for the pump (20), which controls the pump (20) using data obtained by sensor means, is provided.
  3. Setting tool according to Claim 2, characterised in that the sensor means include a piston sensor (31) which detects the position of the drive piston (15).
  4. Setting tool according to Claim 3, characterised in that the sensor means include a temperature sensor (33).
  5. Setting tool according to any one of Claims 1 to 4, characterised in that an electrically activatable shut-off valve (28) is arranged between the pump (20) and the combustion chamber (11), the shut-off valve (28) being controlled by means of the control unit (30).
EP09154393.4A 2008-04-01 2009-03-05 Fuel driven fastener Not-in-force EP2106883B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008000909A DE102008000909A1 (en) 2008-04-01 2008-04-01 Internal combustion setting device

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Publication Number Publication Date
EP2106883A1 EP2106883A1 (en) 2009-10-07
EP2106883B1 true EP2106883B1 (en) 2017-01-04

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US (1) US7980440B2 (en)
EP (1) EP2106883B1 (en)
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DE (1) DE102008000909A1 (en)

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Publication number Publication date
US7980440B2 (en) 2011-07-19
DE102008000909A1 (en) 2009-10-08
JP2009248302A (en) 2009-10-29
US20090250499A1 (en) 2009-10-08
JP5417011B2 (en) 2014-02-12
EP2106883A1 (en) 2009-10-07

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