EP0223740B1 - Powder-actuated nail-setting tool - Google Patents

Powder-actuated nail-setting tool Download PDF

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Publication number
EP0223740B1
EP0223740B1 EP86810504A EP86810504A EP0223740B1 EP 0223740 B1 EP0223740 B1 EP 0223740B1 EP 86810504 A EP86810504 A EP 86810504A EP 86810504 A EP86810504 A EP 86810504A EP 0223740 B1 EP0223740 B1 EP 0223740B1
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EP
European Patent Office
Prior art keywords
guide
piston
duct
setting tool
piston guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP86810504A
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German (de)
French (fr)
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EP0223740A3 (en
EP0223740A2 (en
Inventor
Peter Jochum
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Hilti AG
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Hilti AG
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Publication of EP0223740A2 publication Critical patent/EP0223740A2/en
Publication of EP0223740A3 publication Critical patent/EP0223740A3/en
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Publication of EP0223740B1 publication Critical patent/EP0223740B1/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
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil

Definitions

  • the invention relates to a powder-operated setting tool with a piston guide, within which a driving piston can be driven from a rear starting position into a front end position by means of propellant gases of a propellant charge, the piston guide at the rear end a receptacle for the propellant charge and in the rear and front area through a channel with one another has connected openings, the channel being formed between the piston guide and a housing surrounding the latter, and the rear opening being closed in its rear starting position with respect to the receptacle for the propellant charges from the driving piston.
  • the invention has for its object to provide a powder-operated bolt-actuating device, the driving piston of which is reliably brought into ignition-ready starting positions by the exhaust gases.
  • the sleeve closes the channel.
  • the zone of the channel in front of the closure point and the front area of the guide bore thus form a storage space which is closed to the atmosphere.
  • the exhaust gases compressed therein are fully available for returning the driving piston to the ignition-ready initial position.
  • the bushing is a rotationally symmetrical part that is easy to produce and is particularly suitable for a channel in the form of an annular gap surrounding the piston guide.
  • the sleeve protrudes telescopically into the annular gap between the piston guide and the housing. Wall parts of the sleeve and housing or piston guide work together as locking points that can be contacted.
  • the bushing is advantageously arranged on a bolt guide that is displaceable relative to the piston guide and can be supported on the base.
  • the sliding movements of the bolt guide are also used to control the bush.
  • the bolt guide projects over the housing for safety reasons.
  • the sleeve keeps the channel closed.
  • the device is pressed against a surface with the pin guide, which causes the pin guide and thus the bush to move backwards relative to the piston guide.
  • the can is opened by the can.
  • the driving-in process of the pin causes recoil forces which move the piston guide together with the housing relative to the bush and the pin guide to the rear.
  • the canal is closed again by the sleeve and the aforementioned closed storage space is created.
  • the exhaust gases compressed in the storage space return the driving piston to the ignition-ready initial position.
  • the bush and the pin guide are held in the rest position, for example by spring force.
  • the bushing has a closure lamella for closing a ventilation opening opening into the atmosphere from the channel.
  • the closure lamella keeps the ventilation opening closed, so that no exhaust gases can escape into the atmosphere via the open channel. In this way, a maximum of the exhaust gases is used for the complete return of the driving piston.
  • the vent opening is released from the closure plate. The gases present in the piston guide when the drive piston is returned can now escape through the rear opening of the piston guide and the zone of the channel connected to it via the ventilation opening and thus do not constitute an obstacle to the return process.
  • the setting tool shown in FIG. 1 has a housing denoted overall by 1, which consists of an outer shell 2 with a handle 3 protruding laterally, a support tube 4 protruding beyond the shell 2 and a muzzle-side guide tube 5.
  • a trigger 6 for triggering the setting process is arranged on handle 3.
  • a propellant charge magazine which is denoted overall by 7 and protrudes from the housing 1 and is composed of a carrier strip 8 and propellant charges 9 sitting thereon.
  • a tubular bolt guide 11 which is displaceable relative to the housing 1, projects above the guide tube 5.
  • the bolt guide 11 is integrally connected to the rear by a locking slide designed as a bushing 12.
  • the bushing 12 is mounted on the front side in the guide tube 5 and on the rear side in the support tube 4 in a sealing and displaceable manner.
  • the sleeve 12 has longitudinal slots 13 on the front side and openings 14 on the rear side.
  • a piston guide, designated overall by 15, projects into the sleeve 12 from the rear. This sits immovably in the support tube 4 of the housing 1.
  • the driving piston 18 consists of a rear-side head 19, which is sealingly mounted in the guide bore 17, and a shaft 21 with a smaller circular cross-section adjoining the latter.
  • the shaft 21 passes through a stop ring 22 for the driving piston 18, which is supported in the bolt guide 11 on the rear side, and slidably projects into the orifice bore 23 of the bolt guide 11 for sealing and guiding purposes.
  • a bolt 24 to be inserted is inserted into the mouth bore 23.
  • the device with the mouth at the fastening point is pressed against a base 25.
  • the bolt guide 11 has shifted from the protruding position shown in FIG. 1 together with the bush 12 into the rear position which can be seen in FIG. 2.
  • the drive piston 18 is also in its ignitable rear starting position.
  • a channel 26 which is essentially in the form of an annular gap between the piston guide 15 and the support tube 4 of the housing 1, is connected via the longitudinal slots 13 to front openings 27 of the piston guide 15 and via the openings 14 to the rear openings 28 of the piston guide 15.
  • the head 19 of the driving piston 18 separates the rear opening 28 from the receptacle 16.
  • An annular closure lamella 29 sealingly covers a vent opening 31 opening into the atmosphere.
  • the setting process is triggered by igniting the propellant charge 9.
  • This forms 16 highly compressed propellant gases in the receptacle, which accelerate the propellant piston 18 to the front under the action of the rear end face of the head 19.
  • the head 19 releases the rear openings 28 in the piston guide 15.
  • exhaust gases flow from the receptacle 16 via the openings 28 into the channel 26 and from here via the front openings 27 in front of the head 19 into the guide bore 17, as is illustrated by a flow arrow in FIG. 3.
  • the reaction forces which act as a recoil on the parts connected to the housing 1 so as to be displaceable during the driving-in process lead to a displacement of the housing 1 and the piston guide 15 towards the rear relative to the pin guide 11 and the bush 12 towards the end of the driving-in process.
  • An enlarged zone 32 of the bushing 12 comes into telescopic contact with an inside sealing bead 33 of the support tube 4 of the housing 1. Since the bushing 12 is also in sealing contact with the bolt guide 11, through the front zone of the channel 26 and the guide bore 17 of the bolt guide 11 creates a closed storage space, as can be seen in FIG. 4.
  • the compressed exhaust gases present here bring about a reliable return of the driving piston 18 into its ignition-ready initial position.
  • the remaining gases located behind the head 19 in the piston guide 15 can escape through the rear openings 28, the adjacent rear zone of the channel 26 and the ventilation opening 31, as indicated by a flow arrow, since the closure plate 29 when the housing 1 is moved due to the recoil has released the vent 31.

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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 Erfindung betrifft ein pulverkraftbetriebenes Setzgerät mit einer Kolbenführung, innerhalb welcher ein Treibkolben mittels Treibgasen einer Treibladung von einer hinteren Ausgangsstellung in eine vordere Endstellung treibbar ist, die Kolbenführung am hinteren Ende eine Aufnahme für die Treibladung sowie im hinteren und im vorderen Bereich durch einen Kanal miteinander verbundene Oeffnungen aufweist, wobei der Kanal zwischen der Kolbenführung und einem diese umgebenden Gehäuse gebildet ist, und die hintere Oeffnung gegenüber der Aufnahme für die Treibladungen vom Treibkolben in seiner hinteren Ausgangsstellung verschlossen ist.The invention relates to a powder-operated setting tool with a piston guide, within which a driving piston can be driven from a rear starting position into a front end position by means of propellant gases of a propellant charge, the piston guide at the rear end a receptacle for the propellant charge and in the rear and front area through a channel with one another has connected openings, the channel being formed between the piston guide and a housing surrounding the latter, and the rear opening being closed in its rear starting position with respect to the receptacle for the propellant charges from the driving piston.

Bei bekannten pulverkraftbetriebenen Bolzensetzgeräten ist es üblich, nach erfolgtem Eintreibhub eines die Bolzen beaufschlagenden Treibkolbens diesen durch mechanischen Kraftangriff aus der vorderen Endstellung in die zündbereite hintere Ausgangsstellung zurückzuführen. Dieser Rückführvorgang verursacht eine umständliche und zeitaufwendige Handhabung der Geräte.In known powder-operated bolt-setting devices, it is customary, after a driving-in stroke of a driving piston acting on the bolts has been carried out, to return the latter from the front end position into the ignition-ready rear starting position by mechanical force application. This return process causes cumbersome and time-consuming handling of the devices.

Um diesem Nachteil zu begegnen, ist ein pulverkraftbetriebenes Bolzensetzgerät bekannt (US-PS 3 744 240), das die Rückführung des Treibkolbens durch die Abgase der Treibladungen bewerkstelligt. Hier zeigt sich allerdings, daß die zum Rückführen des Treibkolbens nutzbare Energie zu einer vollständigen Rückführung vielfach nicht ausreicht. Die Ursache hierfür liegt in den Abgasverlusten, die durch einen längs der Kolbenführung sich erstreckenden Kanal auftreten, der vorder- und hinterseitig über Öffnungen zum einen mit dem vorderen Bereich der Führungsbohrung der Kolbenführung und zum anderen hinterseitig mit einer Aufnahme für die Treibladungen in Verbindung steht.In order to counter this disadvantage, a powder-actuated bolt-actuating device is known (US Pat. No. 3,744,240) which effects the return of the driving piston through the exhaust gases from the propellant charges. Here, however, it is shown that the energy usable for returning the driving piston is often not sufficient for complete return. The reason for this lies in the exhaust gas losses that occur through a channel extending along the piston guide, which is connected on the front and rear through openings on the one hand to the front area of the guide bore of the piston guide and on the other hand to a receptacle for the propellant charges.

Der Erfindung liegt die Aufgabe zugrunde, ein pulverkraftbetriebenes Bolzensetzgerät zu schaffen, dessen Treibkolben von den Abgasen zuverlässig in zündbereite Ausgangsstellungen gebracht wird.The invention has for its object to provide a powder-operated bolt-actuating device, the driving piston of which is reliably brought into ignition-ready starting positions by the exhaust gases.

Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.According to the invention the object is achieved by the characterizing features of claim 1.

Nach dem Überströmen der Abgase während des Eintreibhubs des Treibkolbens von der als Zündkammer dienenden Aufnahme in den vorderen Bereich der Führungsbohrung verschließt die Büchse den Kanal. Die vor der Verschlußstelle liegende Zone des Kanals und der vordere Bereich der Führungsbohrung bilden so einen gegenüber der Atmosphäre geschlossenen Speicherraum. Die darin komprimierten Abgase stehen vollends für das Rückführen des Treibkolbens in die zündbereite Ausgangsstellung zur Verfügung.After the exhaust gases overflow during the driving stroke of the driving piston from the receptacle serving as the ignition chamber into the front area of the guide bore, the sleeve closes the channel. The zone of the channel in front of the closure point and the front area of the guide bore thus form a storage space which is closed to the atmosphere. The exhaust gases compressed therein are fully available for returning the driving piston to the ignition-ready initial position.

Die Büchse ist ein einfach herstellbares rotationssymmetrisches Teil, das sich insbesondere für einen Kanal in Form eines die Kolbenführung umlaufenden Ringspaltes eignet. Die Büchse ragt so teleskopisch verschiebbar in den Ringspalt zwischen der Kolbenführung und dem Gehäuse ein. Wandungsteile von Büchse und Gehäuse oder Kolbenführung wirken als miteinander kontaktierbare Verschlußstellen zusammen.The bushing is a rotationally symmetrical part that is easy to produce and is particularly suitable for a channel in the form of an annular gap surrounding the piston guide. The sleeve protrudes telescopically into the annular gap between the piston guide and the housing. Wall parts of the sleeve and housing or piston guide work together as locking points that can be contacted.

Mit Vorteil ist die Büchse an einer relativ zur Kolbenführung verschiebbaren, am Untergrund abstützbaren Bolzenführung angeordnet. Die Verschiebebewegungen der Bolzenführung werden so auch zur Steuerung der Büchse genutzt. In Ruhestellung des Gerätes überragt die Bolzenführung aus Sicherheitsgründen das Gehäuse nach vorne.The bushing is advantageously arranged on a bolt guide that is displaceable relative to the piston guide and can be supported on the base. The sliding movements of the bolt guide are also used to control the bush. When the device is at rest, the bolt guide projects over the housing for safety reasons.

In dieser vorderen Stellung hält die Büchse den Kanal verschlossen. Für den Setzvorgang wird das Gerät mit der Bolzenführung gegen einen Untergrund gedrückt, wodurch sich die Bolzenführung und damit auch die Büchse gegenüber der Kolbenführung nach hinten verschieben. Der Kanal wird dadurch von der Büchse geöffnet.In this forward position, the sleeve keeps the channel closed. For the setting process, the device is pressed against a surface with the pin guide, which causes the pin guide and thus the bush to move backwards relative to the piston guide. The can is opened by the can.

Anschließendes Zünden der Treibladung bewirkt den Eintreibhub des Treibkolbens. Nach erfolgter Beschleunigung des Treibkolbens treten diesen hinterseitig beaufschlagende Treibgase als Abgase über die hintere Öffnung jn der Kolbenführung, den Kanal und die vordere Öffnung in der Kolbenführung nach vorne in die Führungsbohrung der Kolbenführung ein.Subsequent ignition of the propellant causes the driving stroke of the driving piston. After the driving piston has accelerated, these driving gases acting on the rear enter as exhaust gases through the rear opening in the piston guide, the channel and the front opening in the piston guide to the front into the guide bore of the piston guide.

Der Eintreibvorgang des Bolzens bewirkt Rückstoßkräfte, welche die Kolbenführung zusammen mit dem Gehäuse gegenüber der Büchse und der Bolzenführung nach hinten verschieben. Dadurch wird der Kanal von der Büchse wieder verschlossen und der voran erwähnte geschlossene Speicherraum geschaffen. Die im Speicherraum komprimierten Abgase bringen den Treibkolben in die zündbereite Ausgangsstellung zurück. Nach dem Abheben des Gerätes vom Untergrund werden die Büchse und die Bolzenführung, beispielsweise durch Federkraft, in Ruhestellung gehalten.The driving-in process of the pin causes recoil forces which move the piston guide together with the housing relative to the bush and the pin guide to the rear. As a result, the canal is closed again by the sleeve and the aforementioned closed storage space is created. The exhaust gases compressed in the storage space return the driving piston to the ignition-ready initial position. After lifting the device from the ground, the bush and the pin guide are held in the rest position, for example by spring force.

Nach einem weiteren Vorschlag der Erfindung weist die Büchse eine Verschlußlamelle zum Verschließen einer vom Kanal in die Atmosphäre mündenden Entlüftungsöffnung auf. Während des Eintreibhubes hält die Verschlußlamelle die Entlüftungsöffnung geschlossen, so daß keine Abgase über den offenen Kanal in die Atmosphäre entweichen können. Dieserart wird also ein Maximum der Abgase zur vollständigen Rückführung des Treibkolbens genutzt. Nach dem Umsteuern der Büchse in die den Kanal verschließende Stellung ist die Entlüftungsöffnung von der Verschlußlamelle freigegeben. Die beim Rückführen des Treibkolbens hinter diesem in der Kolbenführung vorhandenen Gase können nun über die hintere Öffnung der Kolbenführung und die mit dieser verbundene Zone des Kanals über die Entlüftungsöffnung entweichen und bilden so keine Behinderung für den Rückführvorgang.According to a further proposal of the invention, the bushing has a closure lamella for closing a ventilation opening opening into the atmosphere from the channel. During the driving stroke, the closure lamella keeps the ventilation opening closed, so that no exhaust gases can escape into the atmosphere via the open channel. In this way, a maximum of the exhaust gases is used for the complete return of the driving piston. After reversing the sleeve in the position closing the channel, the vent opening is released from the closure plate. The gases present in the piston guide when the drive piston is returned can now escape through the rear opening of the piston guide and the zone of the channel connected to it via the ventilation opening and thus do not constitute an obstacle to the return process.

Die Erfindung wird nachstehend anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

  • Fig. 1 ein Bolzensetzgerät in Ruhestellung, in Ansicht;
  • Fig. 2 den Vorderbereich des Setzgerätes nach Fig. 1 in Zündbereitschaftsstellung, in vergrößertem Längsschnitt;
  • Fig. 3 den Vorderbereich des Setzgerätes nach Fig. 1 beim Eintreibvorgang, in vergrößertem Längsschnitt;
  • Fig. 4 den Vorderbereich des Setzgerätes nach Fig. 1 während des Rückhubs des Treibkolbens, in vergrößertem Längsschnitt.
The invention is explained in more detail below with reference to drawings which show an exemplary embodiment. Show it:
  • Figure 1 shows a bolt gun in the rest position, in view.
  • FIG. 2 shows the front area of the setting tool according to FIG. 1 in the ignition-ready position, in an enlarged longitudinal section;
  • 3 shows the front region of the setting tool according to FIG. 1 during the driving-in process, in an enlarged longitudinal section;
  • Fig. 4 shows the front area of the setting tool according to Fig. 1 during the return stroke of the driving piston, in an enlarged longitudinal section.

Das in Fig. 1 dargestellte Setzgerät weist ein insgesamt mit 1 bezeichnetes Gehäuse auf, das aus einer äußeren Schale 2 mit seitlich abragendem Handgriff 3, einem die Schale 2 nach vorne überragenden Stützrohr 4 und einem mündungsseitigen Führungsrohr 5 besteht. An Handgriff 3 ist ein Trigger 6 zum Auslösen des Setzvorganges angeordnet. Oberseitig ragt aus dem Gehäuse 1 ein schrittweise in das Geräteinnere transportierbares, insgesamt mit 7 bezeichnetes Treibladungsmagazin, das sich aus einem Trägerstreifen 8 und darauf sitzenden Treibladungen 9 zusammensetzt. In Ruhestellung überragt eine gegenüber dem Gehäuse 1 verschiebbare rohrförmige Bolzenführung 11 das Führungsrohr 5.The setting tool shown in FIG. 1 has a housing denoted overall by 1, which consists of an outer shell 2 with a handle 3 protruding laterally, a support tube 4 protruding beyond the shell 2 and a muzzle-side guide tube 5. A trigger 6 for triggering the setting process is arranged on handle 3. On the upper side, a propellant charge magazine, which is denoted overall by 7 and protrudes from the housing 1 and is composed of a carrier strip 8 and propellant charges 9 sitting thereon. In the rest position, a tubular bolt guide 11, which is displaceable relative to the housing 1, projects above the guide tube 5.

Wie der Fig. 2 zu entnehmen ist, schliesst sich an die Bolzenführung 11 nach hinten einstückig ein als Büchse 12 ausgebildeter Verschlussschieber an. Vorderseitig ist die Büchse 12 im Führungsrohr 5 und hinterseitig im Stützrohr 4 dichtend und verschiebbar gelagert. Die Büchse 12 verfügt vorderseitig über Längsschlitze 13 und hinterseitig über Durchbrüche 14. In die Büchse 12 ragt von hinten eine insgesamt mit 15 bezeichnete Kolbenführung ein. Diese sitzt unverschiebbar im Stützrohr 4 des Gehäuses 1. An eine nach hinten offene Aufnahme 16 für die Treibladungen 9 schliesst nach vorne eine zentrale Führungsbohrung 17 für einen insgesamt mit 18 bezeichneten Treibkolben an. Der Treibkolben 18 besteht aus einem hinterseitigen, in der Führungsbohrung 17 dichtend gelagerten Kopf 19 und einem an diesen nach vorne anschliessenden Schaft 21 mit kleinerem Kreisquerschnitt. Der Schaft 21 durchsetzt einen in der Bolzenführung 11 hinterseitig abgestützten Stoppring 22 für den Treibkolben 18 und ragt zum Dichtungs- und Führungszwecke verschiebbar in die Mündungsbohrung 23 der Bolzenführung 11 ein. In die Mündungsbohrung 23 ist ein zu setzender Bolzen 24 eingeführt.As can be seen in FIG. 2, the bolt guide 11 is integrally connected to the rear by a locking slide designed as a bushing 12. The bushing 12 is mounted on the front side in the guide tube 5 and on the rear side in the support tube 4 in a sealing and displaceable manner. The sleeve 12 has longitudinal slots 13 on the front side and openings 14 on the rear side. A piston guide, designated overall by 15, projects into the sleeve 12 from the rear. This sits immovably in the support tube 4 of the housing 1. A central guide bore 17 for a propulsion piston, designated overall by 18, adjoins a receptacle 16 which is open to the rear for the propellant charges 9. The driving piston 18 consists of a rear-side head 19, which is sealingly mounted in the guide bore 17, and a shaft 21 with a smaller circular cross-section adjoining the latter. The shaft 21 passes through a stop ring 22 for the driving piston 18, which is supported in the bolt guide 11 on the rear side, and slidably projects into the orifice bore 23 of the bolt guide 11 for sealing and guiding purposes. A bolt 24 to be inserted is inserted into the mouth bore 23.

In der in Fig. 2 gezeigten Zündbereitschaftsstellung ist das Gerät mit der Mündung an der Befestigungsstelle gegen einen Untergrund 25 gedrückt. Dabei hat sich die Bolzenführung 11 aus der in Fig. 1 gezeigten vorstehenden Position zusammen mit der Büchse 12 in die der Fig. 2 entnehmbare hintere Stellung verschoben. Auch der Treibkolben 18 befindet sich in seiner zündbereiten hinteren Ausgangsstellung.In the ignition readiness position shown in FIG. 2, the device with the mouth at the fastening point is pressed against a base 25. The bolt guide 11 has shifted from the protruding position shown in FIG. 1 together with the bush 12 into the rear position which can be seen in FIG. 2. The drive piston 18 is also in its ignitable rear starting position.

In der Zündbereitschaftsstellung steht ein im wesentlichen als Ringspalt zwischen der Kolbenführung 15 und dem Stützrohr 4 des Gehäuses 1 ausgebildeter Kanal 26 über die Längsschlitze 13 mit vorderseitigen Oeffnungen 27 der Kolbenführung 15 und über die Durchbrüche 14 mit hinterseitigen Oeffnungen 28 der Kolbenführung 15 in Verbindung. Der Kopf 19 des Treibkolbens 18 trennt die hintere Oeffnung 28 von der Aufnahme 16. Eine ringförmige Verschlusslamelle 29 deckt eine in die Atmosphäre mündende Entlüftungsöffnung 31 dichtend ab.In the ignition-ready position, a channel 26, which is essentially in the form of an annular gap between the piston guide 15 and the support tube 4 of the housing 1, is connected via the longitudinal slots 13 to front openings 27 of the piston guide 15 and via the openings 14 to the rear openings 28 of the piston guide 15. The head 19 of the driving piston 18 separates the rear opening 28 from the receptacle 16. An annular closure lamella 29 sealingly covers a vent opening 31 opening into the atmosphere.

Durch Zünden der Treibladung 9 wird der Setzvorgang ausgelöst. Dabei bilden sich in der Aufnahme 16 hochkomprimierte Treibgase, die unter Einwirkung auf die hintere Stirnseite des Kopfes 19 den Treibkolben 18 nach vorne beschleunigen. Nach Zurücklegen einer relativ kurzen Beschleunigungsstrecke gibt der Kopf 19 die hinteren Oeffnungen 28 in der Kolbenführung 15 frei. Dadurch strömen Abgase von der Aufnahme 16 über die Oeffnungen 28 in den Kanal 26 und von hier über die vorderen Oeffnungen 27 vor den Kopf 19 in die Führungsbohrung 17, wie dies ein Strömungspfeil in der Fig. 3 verdeutlicht.The setting process is triggered by igniting the propellant charge 9. This forms 16 highly compressed propellant gases in the receptacle, which accelerate the propellant piston 18 to the front under the action of the rear end face of the head 19. After covering a relatively short acceleration distance, the head 19 releases the rear openings 28 in the piston guide 15. As a result, exhaust gases flow from the receptacle 16 via the openings 28 into the channel 26 and from here via the front openings 27 in front of the head 19 into the guide bore 17, as is illustrated by a flow arrow in FIG. 3.

Die beim Eintreibvorgang als Rückstoss an den mit dem Gehäuse 1 verschiebefest verbundenen Teilen wirksamen Reaktionskräfte führen gegen Ende des Eintreibvorganges zu einem Verschieben des Gehäuses 1 und der Kolbenführung 15 gegenüber der Bolzenführung 11 und der Büchse 12 nach hinten. Dabei tritt eine erweiterte Zone 32 der Büchse 12 teleskopisch in Kontakt mit einem innenseitigen Dichtwulst 33 des Stützrohres 4 des Gehäuses 1. Da die Büchse 12 auch in dichtendem Kontakt mit der Bolzenführung 11 steht, wird so durch die vordere Zone des Kanals 26 und die Führungsbohrung 17 der Bolzenführung 11 ein geschlossener Speicherraum geschaffen, wie dies der Fig. 4 entnehmbar ist. Die hierin vorhandenen komprimierten Abgase bewerkstelligen eine zuverlässige Rückführung des Treibkolbens 18 in dessen zündbereite Ausgangsstellung. Die restlichen hinter dem Kopf 19 in der Kolbenführung 15 befindlichen Gase können währenddessen über die hinteren Oeffnungen 28, die angrenzende hintere Zone des Kanals 26 und die Entlüftungsöffnung 31 - wie durch einen Strömungspfeil angedeutet - entweichen, da die Verschlusslamelle 29 beim rückstossbedingten Verschieben des Gehäuses 1 die Entlüftungsöffnung 31 freigegeben hat.The reaction forces which act as a recoil on the parts connected to the housing 1 so as to be displaceable during the driving-in process lead to a displacement of the housing 1 and the piston guide 15 towards the rear relative to the pin guide 11 and the bush 12 towards the end of the driving-in process. An enlarged zone 32 of the bushing 12 comes into telescopic contact with an inside sealing bead 33 of the support tube 4 of the housing 1. Since the bushing 12 is also in sealing contact with the bolt guide 11, through the front zone of the channel 26 and the guide bore 17 of the bolt guide 11 creates a closed storage space, as can be seen in FIG. 4. The compressed exhaust gases present here bring about a reliable return of the driving piston 18 into its ignition-ready initial position. The remaining gases located behind the head 19 in the piston guide 15 can escape through the rear openings 28, the adjacent rear zone of the channel 26 and the ventilation opening 31, as indicated by a flow arrow, since the closure plate 29 when the housing 1 is moved due to the recoil has released the vent 31.

Nach dem anschliessenden Abheben des Setzgerätes vom Untergrund 25 ist wieder die der Fig. 1 entnehmbare Ruhestellung gegeben, wobei für den nächsten Setzvorgang in an sich bekannter Weise eine neue Kartusche 9 der Aufnahme 16 zugeführt wird.After the subsequent lifting of the setting tool from the base 25, the rest position shown in FIG. 1 is again given, a new cartridge 9 being fed to the receptacle 16 in a manner known per se for the next setting process.

Claims (3)

1. A power-activated stud setting tool having a piston guide (15), within which a driving piston (18) is propellable by means of propelling gases of a propellant charge (9) from a rear initial position into a front end position, the piston guide (15) at the rear end having a receiver (16) for the propellant charge (9) as well as apertures (27, 28), in the rear and in the front region, which are connected together by a duct (26), in which respect the duct (26) is formed between the piston guide (15) and a housing (1) surrounding this, and the rear aperture (28) is closed off relative to the receiver (16) for the propellant charges (9) by the driving piston (18) in its rear initial position, characterised in that a sleeve (12) displaceable in such a way relative to the piston guide (15) and projecting telescopically into the duct (26) is provided for closing off the duct (26), and in that that zone of the duct (26) which lies in front of the closure location and the front region of the guide bore (17) form a storage space which is closed relative to the atmosphere.
2. A stud setting tool according to claim 1, characterised in that the sleeve (12) is arranged on a stud guide (11) which is displaceable relative to the piston guide (15) and is supportable against the substrate (25).
3. A stud setting tool according to claim 1 or 2, characterised in that the sleeve (12) has a closure lamella (29) for closing off a venting aperture (31) opening from the duct (26) into the atmosphere.
EP86810504A 1985-11-19 1986-11-04 Powder-actuated nail-setting tool Expired - Lifetime EP0223740B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3540953 1985-11-19
DE19853540953 DE3540953A1 (en) 1985-11-19 1985-11-19 POWDER POWERED BOLT SETTING DEVICE

Publications (3)

Publication Number Publication Date
EP0223740A2 EP0223740A2 (en) 1987-05-27
EP0223740A3 EP0223740A3 (en) 1988-06-08
EP0223740B1 true EP0223740B1 (en) 1990-08-08

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ID=6286351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810504A Expired - Lifetime EP0223740B1 (en) 1985-11-19 1986-11-04 Powder-actuated nail-setting tool

Country Status (4)

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US (1) US4711385A (en)
EP (1) EP0223740B1 (en)
JP (1) JPH0626797B2 (en)
DE (2) DE3540953A1 (en)

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Also Published As

Publication number Publication date
JPH0626797B2 (en) 1994-04-13
EP0223740A3 (en) 1988-06-08
US4711385A (en) 1987-12-08
EP0223740A2 (en) 1987-05-27
DE3673341D1 (en) 1990-09-13
DE3540953A1 (en) 1987-05-21
JPS62120985A (en) 1987-06-02

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