EP3349945B1 - Driving device powered by combustion gas with valve member - Google Patents

Driving device powered by combustion gas with valve member Download PDF

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Publication number
EP3349945B1
EP3349945B1 EP16760517.9A EP16760517A EP3349945B1 EP 3349945 B1 EP3349945 B1 EP 3349945B1 EP 16760517 A EP16760517 A EP 16760517A EP 3349945 B1 EP3349945 B1 EP 3349945B1
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EP
European Patent Office
Prior art keywords
driving device
combustion chamber
valve member
gas mixture
driving
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EP16760517.9A
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German (de)
French (fr)
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EP3349945A1 (en
Inventor
Dominik Schmidt
Tilo Dittrich
Peter Bruggmueller
Norbert Heeb
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Hilti AG
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Hilti AG
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Publication of EP3349945A1 publication Critical patent/EP3349945A1/en
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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
    • 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
    • B25C1/008—Safety devices

Definitions

  • the invention relates to a driving tool, in particular a handheld driving tool, according to the preamble of claim 1.
  • a driving tool corresponding to the preamble of claim 1 is already out EP 2 826 601 A1 known.
  • WO 2009/140728 A1 describes a fuel gas powered driving tool for driving a nail into a workpiece, in which a combustion chamber is charged with a fuel gas, a driving piston being accelerated against the nail after an ignition process.
  • the combustible gas can be charged to a positive pressure by combined measures by means of a fan and the stroke of the driving piston in order to increase the driving energy.
  • US 8,091,751 B2 describes a fuel gas powered tacker in which the fuel gas can be charged to an excess pressure by means of an electric compressor.
  • a combustion chamber of the device comprises a plurality of combustion chamber parts which can be moved relative to one another and is closed by means of a pressure linkage when the driving tool is pressed against a workpiece.
  • valve member opens automatically when the driving tool is set down from the workpiece.
  • Failure to ignite the mixture can have any cause, for example an intentional termination of the setting process by the operator or a malfunction.
  • An overpressure of the fuel gas mixture in the sense of the invention is understood to mean a pressure increased by means of the charging member in order to increase the driving energy. Even in conventional devices, the pressure of the fuel gas mixture is usually somewhat above an ambient pressure, since the fuel gas under pressure is added to the air in the combustion chamber, which is at atmospheric pressure. This is only a small increase in pressure.
  • An overpressure in the sense of the invention is preferably at least 100 mbar, particularly preferably at least 200 mbar, above atmospheric pressure.
  • a charging member can be any means that at least raises the air portion of the fuel gas mixture in a targeted manner above atmospheric pressure.
  • it can be an electric compressor.
  • valve member in the sense of the invention blocks or opens a connection between the combustion chamber and an external space in a controllable manner.
  • the valve member is not understood to mean a movable combustion chamber part, the displacement of which first forms the combustion chamber.
  • a pushbutton in the sense of the invention is understood to mean any mechanical, electromechanical, opto-electronic or other component by means of which a pressed-on state of the driving tool can be determined.
  • the feeler element can be, for example, a movable linkage, an electrical switch, an optical sensor or something else.
  • the sensing element is connected to the valve element in such a way that the valve element is activated as a function of a position of the sensing element.
  • the driving device can be discontinued via the feeler element, and the fuel gas mixture under pressure can escape via the valve element.
  • the combustion chamber comprises at least two combustion chamber parts which can be moved relative to one another, the combustion chamber parts being combined to form the closed combustion chamber only when the driving tool is pressed on.
  • Devices of this type are generally known and, due to their design, have a high level of security against unwanted or improper triggering. However, when such conventional devices are charged with excess pressure, it can be seen that an automatic opening or even a collapse of the combustion chamber can be disturbed when the device is set down if no ignition has taken place. This is basically due to the fact that such a combustion chamber has large sealing surfaces and sealing systems, on which correspondingly high forces act due to the excess pressure.
  • the combustion chamber parts are closed in a gas-tight manner in the closed state via a self-reinforcing sealing system.
  • a self-reinforcing sealing system In such a system, the contact forces of the seals increase with the pressure present in the combustion chamber, so that a maximum overpressure can in principle be chosen arbitrarily and independently of the force of a pressure spring or the like.
  • the combustion chamber parts are moved relative to one another via a pressure linkage, the pushbutton being provided in addition to the pressure linkage.
  • the valve member can also be controlled directly by the pressure linkage.
  • valve member is designed to be low-force with regard to the excess pressure. This is preferably achieved in a simple manner in that a valve plunger of the valve member has a direction of movement which extends transversely to a direction of action of the excess pressure of the gas mixture. Under a low power Training is to be understood in the present case as any valve arrangement in which a normal operating pressure changes a required actuating force of the valve member at most insignificantly.
  • valve member is mechanically connected directly to the sensing element, so that movement of the sensing element causes the valve to be adjusted. This allows simple implementation and high security against malfunctions, for example of control electronics.
  • the valve member can be adjustable via an electrical actuator.
  • the actuator is preferably connected to an electronic control unit of the driving device.
  • the sensing element can be designed, for example, as an electrical switch or sensor, thereby saving overall construction weight.
  • such a solution allows universal control of the valve member as a safety means.
  • the charging member comprises an electric compressor.
  • the charging member can also be a hand-operated compressor, a compressed air reservoir or the like.
  • the charging member is preferably integrated in the setting tool. Alternatively, the charging member can be separated from the rest of the setting tool.
  • the gas mixture escaping via the valve member drives a generator in order to partially convert mechanical pressure energy into electrical energy.
  • the mechanical energy of the charged gas is not completely lost when the setting process is terminated, but can in part be returned to a battery in the device.
  • the generator is designed by changing the operating mode of the charging member. This can save additional components.
  • the tacker off Fig. 1 is a hand-held device, comprising a housing 1 and a combustion chamber 2 accommodated therein with a combustion chamber wall.
  • a cylinder 3 adjoins the combustion chamber 2 with a driving piston 4 guided therein.
  • a safety mechanism of the device comprises a pressure linkage with a mounting sleeve 5, which is placed on a workpiece (not shown) and pressed in against the pressure of a spring (not shown). Only in this state can a driving-in process be triggered by igniting a fuel gas in the combustion chamber 2.
  • the combustion chamber 2 consists of a plurality of combustion chamber parts (not shown) which can be moved relative to one another and which are only combined into a closed space for receiving an ignitable fuel gas mixture after the placement sleeve 5 has been pressed in via the pressure linkage.
  • Such types of combustion chambers with the aim of improving safety are generally known, for example from the publications mentioned at the beginning. In the present schematic drawings, therefore, the detailed illustration of this safety mechanism has been omitted.
  • an ignitable fuel gas mixture is introduced into the combustion chamber 2 by means of a charging member 6 and a fuel gas accumulator 7.
  • the charging member 6 is designed as an electric compressor 9 supplied by a rechargeable battery 8.
  • the fuel gas is introduced via a metering valve 10 from the fuel gas store into the compressed air downstream of the compressor 9, after which the flow of the fuel gas mixture enters the combustion chamber 2 via a feed line.
  • an ignition of the fuel gas mixture can be triggered via a manually operated trigger 11, so that the driving piston 4 is advanced and a nail link (not shown) from a magazine 13 into the magazine via a driving plunger 12 Drives in the workpiece.
  • the exhaust gases of the ignited and expanded fuel gas can enter the exterior via outlet openings 14 at the end of the path of the driving piston.
  • the drive-in piston 4 is reset in a conventional manner, for example by means of a return spring.
  • the combustion chamber parts are sealed in the mounted state of the device by means of a sealing system such that an increase in pressure in the combustion chamber 2 leads to an increase in the forces acting on the seals (self-reinforcing sealing system).
  • a spring-driven restoring force of the mounting sleeve is no longer sufficient to open the combustion chamber (or to collapse if the design is appropriate). This means that if the setting process is not triggered and the driving tool is not set, the combustion chamber would remain in the loaded state.
  • a valve member 15 which connects the combustion chamber 2 to the outside.
  • the valve member 15 has a valve spool 16 which moves transversely to a pressure direction or outflow direction of the fuel gas mixture.
  • the valve spool 16 is connected to a feeler element 18 via a mechanical linkage 17.
  • the sensing element 18 is located in the area of the mounting sleeve 5 and is shown in the schematic drawing as a push-in probe tip.
  • the linkage 17 is acted upon by a spring 19, so that the pushbutton 18 is moved forward when the driving tool is not in place and the valve member 15 is in an open state (see Fig. 2 ).
  • valve spool 16 When the driving tool is placed on the workpiece, the feeler 18 is inserted against the spring pressure. The valve spool 16 is displaced via the linkage 17 and the valve member 15 is closed.
  • the valve function is shown in the drawings by overlapping or offset openings in the valve slide 16 and in the combustion chamber wall.
  • the mounting sleeve 5 initially remains in its position, since the combustion chamber parts cannot move.
  • the feeler element 18, on the other hand, moves forward due to the spring force of the spring 19, so that the valve element 15 is opened via the linkage 17. In this way, the fuel gas mixture can escape and the excess pressure in the combustion chamber 2 can be reduced (intermediate state according to Fig. 2 ).
  • the combustion chamber parts can be moved by the applied spring forces, so that the mounting sleeve is also shifted back to the front position (not shown).
  • valve member according to the invention also represents an advantageous further development and a safety gain if the sealing system of the combustion chamber is not designed as self-reinforcing or if the resilient spring force of the combustion chamber parts is also designed for opening under excess pressure. A malfunction in connection with a charged combustion chamber can thereby be reliably avoided.
  • Fig. 3 shows a second embodiment of the invention, in which, in contrast to the first embodiment, the valve member 15 is electrically actuated.
  • valve member 15 has an electrical actuator 20, which is connected to an electronic control unit 21.
  • the pushbutton is designed as an electrical pushbutton switch 22 at the end of the mounting sleeve 5.
  • the key switch 22 is also connected to the control unit 21.
  • the driving tool has a manually operated switch 23, which is easily accessible on the housing 1 of the driving tool.
  • a valve member designed in this way can, for example, be designed to be open when de-energized in order to ensure maximum safety.
  • the closed valve member of the present example is opened during operation when the probe member 22 is not seated on a workpiece. However, opening also occurs when the manually operated switch 23 is pressed. In this way, the operator can unload the combustion chamber at any time or make sure of the unloaded state of the device.

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

Description

Die Erfindung betrifft ein Eintreibgerät, insbesondere ein handgeführtes Eintreibgerät, nach dem Oberbegriff des Anspruchs 1. Ein dem Oberbegriff des Anspruchs 1 entsprechendes Eintreibgerät ist bereits aus EP 2 826 601 A1 bekannt.The invention relates to a driving tool, in particular a handheld driving tool, according to the preamble of claim 1. A driving tool corresponding to the preamble of claim 1 is already out EP 2 826 601 A1 known.

WO 2009/140728 A1 beschreibt ein brenngasbetriebenes Eintreibgerät zum Eintreiben eines Nagels in ein Werkstück, bei dem eine Brennkammer mit einem Brenngas beschickt wird, wobei nach einem Zündvorgang ein Eintreibkolben gegen den Nagel beschleunigt wird. Das Brenngas kann durch kombinierte Maßnahmen mittels eines Ventilators sowie dem Hub des Eintreibkolbens auf einen Überdruck aufgeladen werden, um eine Vergrößerung der Eintreibenergie zu erzielen. WO 2009/140728 A1 describes a fuel gas powered driving tool for driving a nail into a workpiece, in which a combustion chamber is charged with a fuel gas, a driving piston being accelerated against the nail after an ignition process. The combustible gas can be charged to a positive pressure by combined measures by means of a fan and the stroke of the driving piston in order to increase the driving energy.

US 8,091,751 B2 beschreibt ein brenngasbetriebenes Eintreibgerät, bei dem das Brenngas mittels eines elektrischen Kompressors auf einen Überdruck aufgeladen werden kann. Eine Brennkammer des Gerätes umfasst mehrere zueinander bewegbare Brennkammerteile und wird mittels eines Andruckgestänges geschlossen, wenn das Eintreibgerät gegen ein Werkstück angepresst wird. US 8,091,751 B2 describes a fuel gas powered tacker in which the fuel gas can be charged to an excess pressure by means of an electric compressor. A combustion chamber of the device comprises a plurality of combustion chamber parts which can be moved relative to one another and is closed by means of a pressure linkage when the driving tool is pressed against a workpiece.

Es ist die Aufgabe der Erfindung, ein Eintreibgerät anzugeben, das eine hohe Betriebssicherheit aufweist.It is the object of the invention to provide a driving tool which has a high level of operational reliability.

Diese Aufgabe wird für ein eingangs genanntes Eintreibgerät erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch das Vorsehen des Ventilgliedes kann auch eine aufgeladene, unter Überdruck stehende Brennklammer kontrolliert und sicher entleert werden, falls keine Zündung erfolgt ist.This object is achieved according to the invention for a driving tool mentioned at the outset with the characterizing features of claim 1. By providing the valve member, a charged, pressurized firing clamp can also be checked and safely emptied if no ignition has taken place.

Allgemein bevorzugt öffnet das Ventilglied automatisch, wenn das Eintreibgerät von dem Werkstück abgesetzt wird.In general, the valve member opens automatically when the driving tool is set down from the workpiece.

Das Ausbleiben der Zündung des Gemisches kann dabei beliebige Ursachen haben, zum Beispiel ein willentliches Abbrechen des Setzvorgangs durch die Bedienperson oder auch eine Betriebsstörung.Failure to ignite the mixture can have any cause, for example an intentional termination of the setting process by the operator or a malfunction.

Unter einem Überdruck des Brenngasgemisches im Sinne der Erfindung wird ein mittels des Aufladegliedes erhöhter Druck zur Steigerung der Eintreibenergie verstanden. Auch bei herkömmlichen Geräten liegt der Druck des Brenngasgemisches meist etwas oberhalb eines Umgebungsdrucks, da das unter Druck stehende Brenngas zu der unter Atmosphärendruck stehenden Luft in der Brennkammer hinzugefügt wird. Dabei handelt es sich nur um eine geringe Druckerhöhung. Ein Überdruck im Sinne der Erfindung liegt bevorzugt um wenigstens 100 mbar, besonders bevorzugt um wenigstens 200 mbar über dem Atmosphärendruck.An overpressure of the fuel gas mixture in the sense of the invention is understood to mean a pressure increased by means of the charging member in order to increase the driving energy. Even in conventional devices, the pressure of the fuel gas mixture is usually somewhat above an ambient pressure, since the fuel gas under pressure is added to the air in the combustion chamber, which is at atmospheric pressure. This is only a small increase in pressure. An overpressure in the sense of the invention is preferably at least 100 mbar, particularly preferably at least 200 mbar, above atmospheric pressure.

Ein Aufladeglied kann im Sinne der Erfindung jedes Mittel sein, das zumindest den Luftanteil des Brenngasgemisches gezielt über den Atmosphärendruck anhebt. Insbesondere kann es sich um einen elektrischen Kompressor handeln.In the context of the invention, a charging member can be any means that at least raises the air portion of the fuel gas mixture in a targeted manner above atmospheric pressure. In particular, it can be an electric compressor.

Ein Ventilglied im Sinne der Erfindung versperrt bzw. öffnet ansteuerbar eine Verbindung zwischen der Brennkammer und einem Außenraum. Im Sinne der Erfindung wird unter dem Ventilglied nicht ein bewegbares Brennkammerteil verstanden, durch dessen Verlagerung die Brennkammer erst gebildet wird.A valve member in the sense of the invention blocks or opens a connection between the combustion chamber and an external space in a controllable manner. In the sense of the invention, the valve member is not understood to mean a movable combustion chamber part, the displacement of which first forms the combustion chamber.

Unter einem Tastglied im Sinne der Erfindung wird jedes mechanische, elektromechanische, opto-elektronische oder sonstige Bauteil verstanden, mittels dessen ein angepresster Zustand des Eintreibgerätes feststellbar ist. Es kann sich bei dem Tastglied zum Beispiel um ein bewegliches Gestänge, einen elektrischen Schalter, einen optischen Sensor oder sonstiges handeln.A pushbutton in the sense of the invention is understood to mean any mechanical, electromechanical, opto-electronic or other component by means of which a pressed-on state of the driving tool can be determined. The feeler element can be, for example, a movable linkage, an electrical switch, an optical sensor or something else.

Erfindungsgemäß steht das Tastglied mit dem Ventilglied so in Verbindung, dass das Ventilglied in Abhängigkeit von einer Position des Tastglieds angesteuert ist. Im Fall einer Nichtzündung des Gasgemisches kann ein Absetzen des Eintreibgerätes über das Tastglied festgestellt werden, und das unter Überdruck stehende Brenngasgemisch kann über das Ventilglied entweichen.According to the invention, the sensing element is connected to the valve element in such a way that the valve element is activated as a function of a position of the sensing element. In the event of a non-ignition of the gas mixture, the driving device can be discontinued via the feeler element, and the fuel gas mixture under pressure can escape via the valve element.

Bei einer allgemein vorteilhaften Ausführungsform der Erfindung umfasst die Brennkammer zumindest zwei zueinander bewegbare Brennkammerteile, wobei die Brennkammerteile nur in einem angepressten Zustand des Eintreibgerätes zu der geschlossenen Brennkammer kombiniert sind. Geräte solcher Bauart sind allgemein bekannt und weisen konstruktionsbedingt eine hohe Sicherheit gegen ein ungewolltes oder missbräuchliches Auslösen auf. Allerdings zeigt sich bei Aufladung solcher herkömmlichen Geräte mit Überdruck, dass eine automatische Öffnung oder auch ein Kollabieren der Brennkammer beim Absetzen des Gerätes gestört sein kann, wenn keine Zündung erfolgt war. Dies liegt grundsätzlich daran, dass eine solche Brennkammer große Dichtflächen und Dichtungssysteme aufweist, auf denen entsprechend hohe Kräfte durch den Überdruck wirken. Lösungen, bei denen eine größere Federkraft einer Rückstellfeder entsprechend dem Überdruck vorgesehen wird, sind wegen der erforderlichen größeren Anpresskraft durch die Bedienperson unkomfortabel. Das erfindungsgemäße, zusätzliche Ventilglied erlaubt eine weitgehend herkömmliche Konstruktion der Brennkammer, da der Überdruck zunächst gezielt reduziert wird, wonach eine Öffnung oder ein Kollabieren der Brennkammer bei geringen Federkräften erfolgt.In a generally advantageous embodiment of the invention, the combustion chamber comprises at least two combustion chamber parts which can be moved relative to one another, the combustion chamber parts being combined to form the closed combustion chamber only when the driving tool is pressed on. Devices of this type are generally known and, due to their design, have a high level of security against unwanted or improper triggering. However, when such conventional devices are charged with excess pressure, it can be seen that an automatic opening or even a collapse of the combustion chamber can be disturbed when the device is set down if no ignition has taken place. This is basically due to the fact that such a combustion chamber has large sealing surfaces and sealing systems, on which correspondingly high forces act due to the excess pressure. Solutions in which a greater spring force of a return spring is provided in accordance with the overpressure are uncomfortable because of the greater contact pressure required by the operator. The additional valve member according to the invention permits a largely conventional construction of the combustion chamber, since the excess pressure is initially selectively reduced, after which the combustion chamber is opened or collapses with low spring forces.

Bei einer besonders bevorzugten Ausführungsform ist es dabei vorgesehen, dass die Brennkammerteile in dem geschlossenen Zustand über ein selbstverstärkendes Dichtungssystem gasdicht abgeschlossen sind. Bei einem solchen System steigen die Anpresskräfte der Dichtungen mit dem in der Brennkammer vorliegenden Druck, so dass ein maximaler Überdruck im Prinzip beliebig und unabhängig von der Kraft einer Andruckfeder oder Ähnlichem gewählt werden kann.In a particularly preferred embodiment, it is provided that the combustion chamber parts are closed in a gas-tight manner in the closed state via a self-reinforcing sealing system. In such a system, the contact forces of the seals increase with the pressure present in the combustion chamber, so that a maximum overpressure can in principle be chosen arbitrarily and independently of the force of a pressure spring or the like.

Bei einer bevorzugten Detailgestaltung der Erfindung werden dabei die Brennkammerteile über ein Andruckgestänge zueinander bewegt, wobei das Tastglied zusätzlich zu dem Andruckgestänge vorgesehen ist. Dies erlaubt eine zuverlässige Ansteuerung des Ventilgliedes beim Absetzen des Eintreibgerätes unabhängig von dem gewählten Überdruck und dessen Auswirkung auf das Andruckgestänge. Bei anderen Ausführungsformen kann das Ventilglied aber auch unmittelbar durch das Andruckgestänge angesteuert werden.In a preferred detailed design of the invention, the combustion chamber parts are moved relative to one another via a pressure linkage, the pushbutton being provided in addition to the pressure linkage. This allows a reliable control of the valve member when the driving tool is lowered, regardless of the overpressure selected and its effect on the pressure linkage. In other embodiments, the valve member can also be controlled directly by the pressure linkage.

Allgemein vorteilhaft ist es vorgesehen, dass das Ventilglied bezüglich des Überdrucks kraftarm ausgebildet ist. Bevorzugt wird dies auf einfache Weise erreicht, indem ein Ventilstempel des Ventilglieds eine Bewegungsrichtung aufweist, die quer zu einer Wirkungsrichtung des Überdrucks des Gasgemisches verläuft. Unter einer kraftarmen Ausbildung ist vorliegend jede Ventilanordnung zu verstehen, bei der ein betriebsüblicher Überdruck eine erforderliche Stellkraft des Ventilglieds allenfalls unwesentlich verändert.It is generally advantageous that the valve member is designed to be low-force with regard to the excess pressure. This is preferably achieved in a simple manner in that a valve plunger of the valve member has a direction of movement which extends transversely to a direction of action of the excess pressure of the gas mixture. Under a low power Training is to be understood in the present case as any valve arrangement in which a normal operating pressure changes a required actuating force of the valve member at most insignificantly.

Bei einer ersten möglichen Ausführungsform ist das Ventilglied mechanisch unmittelbar mit dem Tastglied verbunden, so dass eine Bewegung des Tastgliedes eine Verstellung des Ventils bewirkt. Dies erlaubt eine einfache Realisierung und eine hohe Sicherheit gegen Betriebsstörungen zum Beispiel einer Steuerelektronik.In a first possible embodiment, the valve member is mechanically connected directly to the sensing element, so that movement of the sensing element causes the valve to be adjusted. This allows simple implementation and high security against malfunctions, for example of control electronics.

Bei einer zweiten möglichen Ausführungsform kann das Ventilglied über einen elektrischen Aktuator verstellbar sein. Bevorzugt ist der Aktuator dabei mit einer elektronischen Steuereinheit des Eintreibgerätes verbunden. Bei einer solchen Ausführungsform kann das Tastglied zum Beispiel als elektrischer Schalter oder Sensor ausgebildet sein, wodurch insgesamt Baugewicht gespart wird. Zudem erlaubt eine solche Lösung eine universelle Ansteuerung des Ventilglieds als Sicherheitsmittel.In a second possible embodiment, the valve member can be adjustable via an electrical actuator. The actuator is preferably connected to an electronic control unit of the driving device. In such an embodiment, the sensing element can be designed, for example, as an electrical switch or sensor, thereby saving overall construction weight. In addition, such a solution allows universal control of the valve member as a safety means.

Bei einer konstruktiv einfachen und allgemein bevorzugten Ausführungsform der Erfindung umfasst das Aufladungsglied einen elektrischen Kompressor. Alternativ kann es sich bei dem Aufladungsglied aber auch um einen handbetätigten Kompressor, einen Vorrats-Druckluftspeicher oder Ähnliches handeln. Bevorzugt ist das Aufladungsglied in das Setzgerät integriert. Alternativ kann das Aufladungsglied vom übrigen Setzgerät getrennt sein.In a structurally simple and generally preferred embodiment of the invention, the charging member comprises an electric compressor. Alternatively, the charging member can also be a hand-operated compressor, a compressed air reservoir or the like. The charging member is preferably integrated in the setting tool. Alternatively, the charging member can be separated from the rest of the setting tool.

Bei einer allgemein vorteilhaften Weiterbildung der Erfindung treibt das über das Ventilglied entweichende Gasgemisch einen Generator an, um mechanische Druckenergie teilweise in elektrische Energie umzuwandeln. Die mechanische Energie des aufgeladenen Gases geht bei einem Abbruch des Setzvorgangs somit nicht vollständig verloren, sondern kann zum Teil in einen Akku des Gerätes rückgeführt werden. In bevorzugter Weiterbildung ist dabei der Generator durch Änderung der Betriebsart des Aufladegliedes ausgebildet. Hierdurch können zusätzliche Bauteile eingespart werden.In a generally advantageous development of the invention, the gas mixture escaping via the valve member drives a generator in order to partially convert mechanical pressure energy into electrical energy. The mechanical energy of the charged gas is not completely lost when the setting process is terminated, but can in part be returned to a battery in the device. In a preferred development, the generator is designed by changing the operating mode of the charging member. This can save additional components.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den nachfolgend beschriebenen Ausführungsbeispielen sowie aus den abhängigen Ansprüchen.Further advantages and features of the invention result from the exemplary embodiments described below and from the dependent claims.

Nachfolgend werden zwei bevorzugte Ausführungsbeispiele der Erfindung beschrieben und anhand der anliegenden Zeichnungen näher erläutert.

Fig. 1
zeigt eine schematische Schnittansicht eines erfindungsgemäßen Eintreibgerätes eines ersten Ausführungsbeispiels mit mechanisch angesteuertem Ventilglied in einem ersten Betriebszustand.
Fig. 2
zeigt das Eintreibgerät aus Fig. 1 in einem zweiten Betriebszustand.
Fig. 3
zeigt eine schematische Schnittansicht eines erfindungsgemäßen Eintreibgerätes eines zweiten Ausführungsbeispiels mit elektrisch angesteuertem Ventilglied.
Two preferred exemplary embodiments of the invention are described below and explained in more detail with reference to the accompanying drawings.
Fig. 1
shows a schematic sectional view of a driving device according to the invention of a first embodiment with mechanically controlled valve member in a first operating state.
Fig. 2
shows the driver Fig. 1 in a second operating state.
Fig. 3
shows a schematic sectional view of a driving device according to the invention of a second embodiment with an electrically controlled valve member.

Das Eintreibgerät aus Fig. 1 ist ein handgeführtes Gerät, umfassend ein Gehäuse 1 und eine darin aufgenommene Brennkammer 2 mit einer Brennkammerwand. An die Brennkammer 2 grenzt ein Zylinder 3 mit einem darin geführten Eintreibkolben 4 an.The tacker off Fig. 1 is a hand-held device, comprising a housing 1 and a combustion chamber 2 accommodated therein with a combustion chamber wall. A cylinder 3 adjoins the combustion chamber 2 with a driving piston 4 guided therein.

Eine Sicherheitsmechanik des Gerätes umfasst ein Andruckgestänge mit einer Aufsetzhülse 5, die auf ein Werkstück (nicht dargestellt) aufgesetzt wird und gegen den Druck einer Feder (nicht dargestellt) eingedrückt wird. Nur in diesem Zustand kann ein Eintreibvorgang durch Zünden eines Brenngases in der Brennkammer 2 ausgelöst werden. Die Brennkammer 2 besteht dabei aus mehreren zueinander bewegbaren Brennkammerteilen (nicht dargestellt), die erst nach dem Eindrücken der Aufsetzhülse 5 über das Andruckgestänge zu einem geschlossenen Raum zur Aufnahme eines zündfähigen Brenngasgemisches kombiniert sind. Solche Bauarten von Brennkammern mit dem Ziel einer Sicherheitsverbesserung sind allgemein bekannt, zum Beispiel aus den eingangs genannten Druckschriften. In den vorliegenden schematischen Zeichnungen wurde daher auf die detaillierte Darstellung dieser Sicherheitsmechanik verzichtet.A safety mechanism of the device comprises a pressure linkage with a mounting sleeve 5, which is placed on a workpiece (not shown) and pressed in against the pressure of a spring (not shown). Only in this state can a driving-in process be triggered by igniting a fuel gas in the combustion chamber 2. The combustion chamber 2 consists of a plurality of combustion chamber parts (not shown) which can be moved relative to one another and which are only combined into a closed space for receiving an ignitable fuel gas mixture after the placement sleeve 5 has been pressed in via the pressure linkage. Such types of combustion chambers with the aim of improving safety are generally known, for example from the publications mentioned at the beginning. In the present schematic drawings, therefore, the detailed illustration of this safety mechanism has been omitted.

Ein zündfähiges Brenngasgemisch wird vorliegend mittels eines Aufladeglieds 6 und eines Brenngasspeichers 7 in die Brennkammer 2 eingebracht. Das Aufladeglied 6 ist als von einem Akku 8 versorgter, elektrischer Kompressor 9 ausgebildet. Das Brenngas wird über ein Dosierventil 10 von dem Brenngasspeicher in die komprimierte Luft stromabwärts des Kompressors 9 eingebracht, wonach der Strom des Brenngasgemisches über eine Zuleitung in die Brennkammer 2 eintritt.In the present case, an ignitable fuel gas mixture is introduced into the combustion chamber 2 by means of a charging member 6 and a fuel gas accumulator 7. The charging member 6 is designed as an electric compressor 9 supplied by a rechargeable battery 8. The fuel gas is introduced via a metering valve 10 from the fuel gas store into the compressed air downstream of the compressor 9, after which the flow of the fuel gas mixture enters the combustion chamber 2 via a feed line.

Bei beladener Brennkammer kann über einen handbetätigten Trigger 11 eine Zündung des Brenngasgemisches ausgelöst werden, so dass der Eintreibkolben 4 vorgetrieben wird und über einen Eintreibstößel 12 ein Nagelglied (nicht dargestellt) aus einem Magazin 13 in das Werkstück eintreibt. Die Abgase des gezündeten und expandierten Brenngases können zum Ende des Weges des Eintreibkolbens über Auslassöffnungen 14 in den Außenraum eintreten.When the combustion chamber is loaded, an ignition of the fuel gas mixture can be triggered via a manually operated trigger 11, so that the driving piston 4 is advanced and a nail link (not shown) from a magazine 13 into the magazine via a driving plunger 12 Drives in the workpiece. The exhaust gases of the ignited and expanded fuel gas can enter the exterior via outlet openings 14 at the end of the path of the driving piston.

Eine Rückstellung des Eintreibkolbens 4 nach dem Eintreibvorgang erfolgt auf herkömmliche Weise, zum Beispiel mittels einer Rückstellfeder.The drive-in piston 4 is reset in a conventional manner, for example by means of a return spring.

Im vorliegenden Beispiel sind die Brennkammerteile im aufgesetzten Zustand des Gerätes mittels eines Dichtungssystems so abgedichtet, dass eine Druckerhöhung in der Brennkammer 2 zu einer Erhöhung der auf die Dichtungen wirkenden Kräfte führt (selbstverstärkendes Dichtungssystem). Bei entsprechendem Überdruck durch die Beladung mittels des Aufladegliedes 6 reicht eine federgetriebene Rückstellkraft der Aufsetzhülse nicht mehr aus, die Brennkammer zu öffnen (bzw. bei entsprechender Bauart zu kollabieren). Dies führt dazu, dass bei Nichtauslösen des Setzvorgangs und Absetzen des Eintreibgerätes die Brennkammer im beladenen Zustand verbleiben würde.In the present example, the combustion chamber parts are sealed in the mounted state of the device by means of a sealing system such that an increase in pressure in the combustion chamber 2 leads to an increase in the forces acting on the seals (self-reinforcing sealing system). With a corresponding overpressure due to the loading by means of the charging member 6, a spring-driven restoring force of the mounting sleeve is no longer sufficient to open the combustion chamber (or to collapse if the design is appropriate). This means that if the setting process is not triggered and the driving tool is not set, the combustion chamber would remain in the loaded state.

Zum Abbau des Überdrucks in der Brennkammer ist erfindungsgemäß ein Ventilglied 15 vorgesehen, dass die Brennkammer 2 mit dem Außenraum verbindet. Das Ventilglied 15 hat einen Ventilschieber 16, der sich quer zu einer Druckrichtung bzw. Ausströmungsrichtung des Brenngasgemisches bewegt. Hierdurch ist ein Widerstand des Ventilschiebers kaum abhängig von der Größe des Überdrucks in der Brennkammer 2.To reduce the excess pressure in the combustion chamber, a valve member 15 is provided according to the invention, which connects the combustion chamber 2 to the outside. The valve member 15 has a valve spool 16 which moves transversely to a pressure direction or outflow direction of the fuel gas mixture. As a result, a resistance of the valve slide is hardly dependent on the size of the excess pressure in the combustion chamber 2.

Der Ventilschieber 16 ist über ein mechanisches Gestänge 17 mit einem Tastglied 18 verbunden. Das Tastglied 18 befindet sich im Bereich der Aufsetzhülse 5 und ist in der schematischen Zeichnung als eindrückbare Tastspitze dargestellt.The valve spool 16 is connected to a feeler element 18 via a mechanical linkage 17. The sensing element 18 is located in the area of the mounting sleeve 5 and is shown in the schematic drawing as a push-in probe tip.

Das Gestänge 17 ist über eine Feder 19 kraftbeaufschlagt, so dass das Tastglied 18 im nicht aufgesetzten Zustand des Eintreibgerätes nach vorne verschoben ist und das Ventilglied 15 sich in einem geöffneten Zustand befindet (siehe Fig. 2).The linkage 17 is acted upon by a spring 19, so that the pushbutton 18 is moved forward when the driving tool is not in place and the valve member 15 is in an open state (see Fig. 2 ).

Wenn das Eintreibgerät auf das Werkstück aufgesetzt ist, wird das Tastglied 18 gegen den Federdruck eingeschoben. Der Ventilschieber 16 wird dabei über das Gestänge 17 versetzt und das Ventilglied 15 wird geschlossen. Die Ventilfunktion ist in den Zeichnungen durch überdeckende bzw. versetzte Öffnungen in dem Ventilschieber 16 und in der Brennkammerwand dargestellt.When the driving tool is placed on the workpiece, the feeler 18 is inserted against the spring pressure. The valve spool 16 is displaced via the linkage 17 and the valve member 15 is closed. The valve function is shown in the drawings by overlapping or offset openings in the valve slide 16 and in the combustion chamber wall.

In dem in Fig. 1 gezeigten, aufgesetzten Zustand des Eintreibgerätes wird die Brennkammer 2 mit der Brenngasmischung unter Überdruck beaufschlagt. Aufsetzhülse 5 und Tastglied 18 sind eingeschoben.In the in Fig. 1 shown, attached state of the driving tool, the combustion chamber 2 is acted upon by the fuel gas mixture under excess pressure. Attachment sleeve 5 and push button 18 are inserted.

Wird das Gerät nun ohne ein Auslösen von dem Werkstück abgesetzt, so verbleibt die Aufsetzhülse 5 zunächst in ihrer Position, da die Brennkammerteile sich nicht verschieben können. Das Tastglied 18 fährt dagegen aufgrund der Federkraft der Feder 19 vor, so dass über das Gestänge 17 das Ventilglied 15 geöffnet wird. Auf diese Weise kann das Brenngasgemisch entweichen und der Überdruck in der Brennkammer 2 abgebaut werden (Zwischenzustand gemäß Fig. 2).If the device is now set down from the workpiece without triggering, the mounting sleeve 5 initially remains in its position, since the combustion chamber parts cannot move. The feeler element 18, on the other hand, moves forward due to the spring force of the spring 19, so that the valve element 15 is opened via the linkage 17. In this way, the fuel gas mixture can escape and the excess pressure in the combustion chamber 2 can be reduced (intermediate state according to Fig. 2 ).

Nach einem Abbau des Überdrucks können die Brennkammerteile durch angreifende Federkräfte bewegt werden, so dass auch die Aufsetzhülse wieder in die vordere Position verlagert wird (nicht dargestellt).After the excess pressure has been released, the combustion chamber parts can be moved by the applied spring forces, so that the mounting sleeve is also shifted back to the front position (not shown).

Es versteht sich, dass das erfindungsgemäße Ventilglied auch dann eine vorteilhafte Weiterentwicklung und ein Sicherheitsgewinn darstellt, wenn das Dichtungssystem der Brennkammer nicht als selbstverstärkend ausgelegt ist oder wenn die rückstellende Federkraft der Brennkammerteile auch zu einem Öffnen unter Überdruck ausgelegt sind. Eine Betriebsstörung in Verbindung mit einer aufgeladenen Brennkammer kann hierdurch zuverlässig vermieden werden.It goes without saying that the valve member according to the invention also represents an advantageous further development and a safety gain if the sealing system of the combustion chamber is not designed as self-reinforcing or if the resilient spring force of the combustion chamber parts is also designed for opening under excess pressure. A malfunction in connection with a charged combustion chamber can thereby be reliably avoided.

Fig. 3 zeigt ein zweites Ausführungsbeispiel der Erfindung, bei dem im Unterschied zu dem ersten Ausführungsbeispiel eine elektrische Betätigung des Ventilgliedes 15 erfolgt. Fig. 3 shows a second embodiment of the invention, in which, in contrast to the first embodiment, the valve member 15 is electrically actuated.

Hierzu hat das Ventilglied 15 einen elektrischen Aktuator 20, der mit einer elektronischen Steuereinheit 21 verbunden ist. Das Tastglied ist als ein elektrischer Tastschalter 22 am Ende der Aufsetzhülse 5 ausgebildet. Der Tastschalter 22 ist ebenfalls mit der Steuereinheit 21 verbunden.For this purpose, the valve member 15 has an electrical actuator 20, which is connected to an electronic control unit 21. The pushbutton is designed as an electrical pushbutton switch 22 at the end of the mounting sleeve 5. The key switch 22 is also connected to the control unit 21.

Als weitere Ausgestaltung hat das Eintreibgerät einen manuell bedienbaren Schalter 23, der sich gut erreichbar am Gehäuse 1 des Eintreibgerätes befindet.As a further embodiment, the driving tool has a manually operated switch 23, which is easily accessible on the housing 1 of the driving tool.

Ein solcherart gestaltetes Ventilglied kann zum Beispiel als stromlos offen ausgelegt sein, um ein Maximum an Sicherheit zu gewährleisten. Eine Öffnung des geschlossenen Ventilgliedes des vorliegenden Beispiels erfolgt im Betrieb dann, wenn das Tastglied 22 nicht auf einem Werkstück aufsitzt. Eine Öffnung erfolgt aber auch dann, wenn der manuell bedienbare Schalter 23 gedrückt wird. Hierdurch kann die Bedienperson die Brennkammer jederzeit entladen bzw. sich über den entladenen Zustand des Gerätes vergewissern.A valve member designed in this way can, for example, be designed to be open when de-energized in order to ensure maximum safety. The closed valve member of the present example is opened during operation when the probe member 22 is not seated on a workpiece. However, opening also occurs when the manually operated switch 23 is pressed. In this way, the operator can unload the combustion chamber at any time or make sure of the unloaded state of the device.

Claims (10)

  1. A driving device, comprising
    a driving piston (4) guided in a cylinder (3) for driving a nail member into a workpiece,
    a combustion chamber (2) which is arranged on the driving piston (4) and which can be filled with an ignitable gas mixture,
    a charging member (6) for obtaining an overpressure of the gas mixture and a sensing member (18, 22) for recognizing that the driving device is pressed against a workpiece;
    wherein the combustion chamber (2) is connected to an outer space via a valve member (15), characterized in that the valve member (15) is controlled as a function of a position of the sensing member (18, 22) so that in the event of non-ignition, the overpressure of the gas mixture can escape via the valve member (15).
  2. The driving device according to claim 1, characterized in that the combustion chamber (2) comprises at least two combustion chamber parts which are moveable to each other, wherein the combustion chamber parts are combined to the closed combustion chamber only when the driving device is in a pressed state.
  3. The driving device according to claim 2, characterized in that the combustion chamber parts, in the closed state, are closed in gas-tight manner via a self-reinforcing sealing system.
  4. The driving device according to any one of claims 2 or 3, characterized in that the combustion chamber parts are moved to each other via a pressure linkage (5), wherein the sensing member (18, 22) is provided in addition to the pressure linkage (5).
  5. The driving device according to any one of the preceding claims, characterized in that the valve member (15) is formed to be low-force with respect to the overpressure, wherein in particular a valve plunger (16) of the valve member (15) has a direction of movement running transversely to an effective direction of the overpressure of the gas mixture.
  6. The driving device according to any one of the preceding claims, characterized in that the valve member (15) is mechanically connected directly to the sensing member (18) so that a movement of the sensing member (18) causes an adjustment of the valve member (15).
  7. The driving device according to any one of claims 1 to 5, characterized in that the valve member (15) is adjustable via an electrical actuator (20), wherein in particular the actuator (20) is connected to an electronic control unit (21) of the driving device.
  8. The driving device according to any one of the preceding claims, characterized in that the charging member (6) comprises an electrical compressor (9).
  9. The driving device according to any one of the preceding claims, characterized in that the gas mixture escaping via the valve member (15) drives a generator (6) to partially convert mechanical pressure energy into electrical energy.
  10. The driving device according to claim 9, characterized in that the generator (6) is formed by changing the operating mode of the charging member (6).
EP16760517.9A 2015-09-14 2016-09-06 Driving device powered by combustion gas with valve member Active EP3349945B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15185079.9A EP3141348A1 (en) 2015-09-14 2015-09-14 Driving device powered by combustion gas with valve member
PCT/EP2016/070938 WO2017045971A1 (en) 2015-09-14 2016-09-06 Fuel gas-operated drive-in device having valve component

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EP3349945A1 EP3349945A1 (en) 2018-07-25
EP3349945B1 true EP3349945B1 (en) 2020-03-04

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EP (2) EP3141348A1 (en)
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Publication number Publication date
WO2017045971A1 (en) 2017-03-23
US10759032B2 (en) 2020-09-01
EP3141348A1 (en) 2017-03-15
US20190001474A1 (en) 2019-01-03
EP3349945A1 (en) 2018-07-25
CN108025426B (en) 2021-05-04
CN108025426A (en) 2018-05-11

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