EP0029210B1 - Pneumatic driving tool, especially for long fasteners - Google Patents

Pneumatic driving tool, especially for long fasteners Download PDF

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Publication number
EP0029210B1
EP0029210B1 EP80106979A EP80106979A EP0029210B1 EP 0029210 B1 EP0029210 B1 EP 0029210B1 EP 80106979 A EP80106979 A EP 80106979A EP 80106979 A EP80106979 A EP 80106979A EP 0029210 B1 EP0029210 B1 EP 0029210B1
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EP
European Patent Office
Prior art keywords
piston
cylinder
working
space
driving
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Expired
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EP80106979A
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German (de)
French (fr)
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EP0029210A1 (en
Inventor
Arthur Klaus
Horst Tacke
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Signode Corp
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Signode Corp
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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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder

Definitions

  • the invention relates to a pneumatically actuated driving tool, especially for long fasteners; with a cylinder in which a working piston is axially displaceably mounted, a driver blade which is guided in an input channel and is rigidly connected to the working piston, and a manually operated control valve with which the working chamber of the cylinder can be connected either to the atmosphere or to a compressed air supply chamber.
  • a wide variety of systems for returning the working piston to the top dead center position are known for pneumatically operated driving tools.
  • all of these systems have two major disadvantages. This is because these systems require a significant amount of construction height or volume. Clamping or nailing devices, which are provided for fasteners up to a length of 100 to 120 mm, can still be designed so that an operator can carry and handle them. If, however, drive-in tools for fasteners with a length of 130 mm to about 200 mm were built with the previously known system, these tools could hardly be worn anymore and handled even less in a previously known manner.
  • all previously known systems work with their working pistons during the driving-in process against more or less large restoring forces (spring or gas pressure). However, these restoring forces reduce the forces that are required to drive in the fastener and in turn require larger piston diameters and larger control valves.
  • a pneumatic driving tool is also known from DE-B-1 170 338, in which no restoring forces act on the working piston during the driving process.
  • the return stroke of the working piston connected to the outside air on its front side is brought about by generating a negative pressure on the rear side of the working piston by means of a jet pump, which can be connected to the compressed air supply line by means of a control member.
  • the theoretical maximum value for the differential pressure exerted on the working piston is equal to the atmospheric pressure, which, however, is insufficient for a quick return stroke of the working piston to its top dead center.
  • the invention is therefore based on the object of providing a generic driving tool which, with the same size as comparable conventional tools, has an increased driving power.
  • an auxiliary cylinder in which a piston is mounted axially displaceably, and in that a piston rod connected to the piston can be brought into engagement with the structural unit consisting of working piston and driver blade with an auxiliary valve being provided with which the spaces of the auxiliary cylinder on both sides of the piston can be alternately connected to the atmosphere and the compressed air supply space, that the working cylinder is provided in the space under the working piston with exhaust air openings and that the control valve and the auxiliary valve are coupled to one another via a coupling device such that the working space of the Cylinder can be connected to the compressed air supply space after that space of the auxiliary cylinder has been connected to the compressed air supply space, the action of which causes the piston to move into the end position in which its piston rod is connected to the structure consisting of the working piston and driver blade is disengaged, and that the other space of the auxiliary cylinder is connected to the compressed air supply space after the working space of the cylinder has been connected to the atmosphere, whereby the piston rod of the piston
  • This configuration of the driving tool ensures that its working piston does not have to overcome any restoring forces during the working stroke. The entire work of the tool is therefore available for driving in the fastener.
  • the control valve and the auxiliary valve are reversed so that the piston rod engages with the building skin formed from the working piston and the driver blade and can move it back into the starting position without overcoming a counter pressure.
  • the auxiliary cylinder can be arranged within the usual height of the driving tool.
  • the pneumatic driving tool shown in FIGS. 1 and 2 has a master cylinder 8, in which a working piston 3 is axially displaceable.
  • the working piston 3 is rigidly connected to a driver blade 7, which is guided in an input channel 4.
  • An auxiliary cylinder 1 is arranged parallel to the drive channel 4 such that the overall height of the device is not increased.
  • a piston 11 is slidably mounted in the auxiliary cylinder 1 and is rigidly connected to a piston rod 2.
  • the piston rod 2 can be brought to bear on the underside of the working piston 3 in order to move it back into its top dead center position after a working stroke.
  • the piston rod 2 moves parallel to the driver blade 7 through the cylinder 8.
  • the auxiliary cylinder 1 is controlled via an auxiliary valve 5 and an exhaust valve 6 such that it runs back into its retracted starting position before the start of the driving-in process, so that the working piston 3 can carry out the driving-in process without counteracting restoring forces.
  • the piston rod 2 consists of a tube in which a contact pin 9, which can be brought into abutment on the underside of the working piston 3, is mounted under the pressure of a spring 10.
  • the outlet valve 6 is arranged in the bottom of the auxiliary cylinder 1 and, when the driving tool is placed on a workpiece, releases a relatively large opening cross section in addition to the auxiliary valve 5. Before the driving-in process begins, the piston 11 of the auxiliary cylinder 1 is therefore moved into the bottom dead center position under the pressure of the compressed air connected on the head side via a line 12 to the compressed air storage space 13.
  • the auxiliary valve 5 is controlled via a cam 14 of the workpiece contact slide 15 in such a way that the space of the auxiliary cylinder 1 located under the piston 11 is vented when the driving tool is placed on a workpiece.
  • a finger trigger valve 17 assigned to the main control valve 19 is activated via a bracket 16.
  • the main control valve 19 is opened, and the compressed air located in the storage space 13 of the driving tool can flow into the working space 26 of the cylinder 8 above the working piston 3.
  • the auxiliary valve 5 is reversed via the cams 14 of the contact slide 15, and the outlet valve 6 is closed, so that compressed air passes through lines 20 from the air supply space 13 into the space of the auxiliary cylinder 1 located under the piston 11 can.
  • the piston 11 is displaced into the upper position due to its larger cross-section on the bottom, as a result of which the working piston 3 is also displaced upward, since the inevitable reversal of the main control valve 19 enabled the compressed air located above the working piston 3 to escape through holes 21.
  • a vacuum holding device 22 is provided, into which an upper shoulder 24 of the working piston 3 provided with a sealing element 23 is inserted in the upper dead center position of the working piston.
  • This vacuum holding device 22 is provided with a check valve 25 so that when the extension 24 of the working piston 3 is retracted, the air in the working space 26 can get into the chamber 28 located above the working piston 3. Since this chamber 28 is connected to the atmosphere when the main control valve 1 is open, the air can escape to the outside.
  • the working piston 3 is pulled out of the vacuum chamber with its attachment 24 as a result of the compressed air acting on its outer surface. Since the check valve 25 remains closed, a vacuum is formed in the vacuum chamber.
  • This negative pressure holds the working piston 3 until a sufficiently large air pressure is stored in the working space above the outer surface of the working piston 3, whereupon the extension 24 of the working piston 3 is completely torn out of the vacuum chamber 22. A high initial acceleration of the working piston 3 is thereby achieved.
  • the working piston 3 can therefore perform the working stroke without having to work against large restoring forces, because the atmospheric air located under the working piston 3 can escape through the exhaust air openings 27 unhindered. Apart from its friction on the wall of the cylinder 8 and the frictional resistance of the fastening means, the working piston 3 is therefore not subject to any greater forces than during free flight.
  • the Auxiliary cylinder 1 which fulfills the same task as in the first embodiment described above, arranged in the housing body.
  • the return of the working piston 3 to the top dead center position is also effected via the piston rod 2 of the auxiliary cylinder 1.
  • the piston rod 2 is articulated on a lever 30, the front end 31 of which, facing away from the pivot point of the lever 30, engages under a lateral protruding nose 32 of the driver blade 7.
  • the auxiliary cylinder 1 is controlled such that the reset lever 30 is pivoted out of the area of the protruding nose 32 fastened to the driver blade 7 so that it does not touch it when the working piston 3 has reached the bottom dead center position.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Die Erfindung betrifft ein pneumatisch betätigbares Eintreibwerkzeug, insbesondere für lange Befestigungsmittel; mit einem Zylinder, in dem ein Arbeitskolben axial verschiebbar gelagert ist, einem Treiberblatt, das in einem Eintreibkanal geführt und mit dem Arbeitskolben starr verbunden ist, und einem manuell betätigbaren Steuerventil, mit dem der Arbeitsraum des Zylinders wahlweise mit der Atmosphäre oder einem Druckluftvorratsraum verbindbarist.The invention relates to a pneumatically actuated driving tool, especially for long fasteners; with a cylinder in which a working piston is axially displaceably mounted, a driver blade which is guided in an input channel and is rigidly connected to the working piston, and a manually operated control valve with which the working chamber of the cylinder can be connected either to the atmosphere or to a compressed air supply chamber.

Für pneumatisch betriebene Eintreibwerkzeuge sind die verschiedensten Systeme zur Rückführung des Arbeitskolbens in die obere Totpunktstellung bekannt. Alle diese Systeme haben jedoch zwei entscheidende Nachteile. Diese Systeme benötigen nämlich einen bedeutenden Aufwand an Bauhöhe oder Volumen des Gerätes. Klammer- oder Nagelgeräte, die für Befestigungsmittel bis zu einer Länge von 100 bis 120 mm vorgesehen sind, können zwar noch so gestaltet werden, daß eine Bedienungsperson diese tragen und handhaben kann. Würden jedoch mit dem bisher bekannten System Eintreibwerkzeuge für Befestigungsmittel mit einer Länge von 130 mm bis etwa 200 mm gebaut, so könnten diese Werkzeuge kaum noch getragen und noch weniger in bisher bekannter Weise gehandhabt werden. Es kommt noch dazu, daß alle bisher bekannten Systeme mit ihrem Arbeitskolben beim Eintreibvorgang gegen mehr oder minder große Rückstellkräfte arbeiten (Feder- oder Gasdruck). Diese Rückstellkräfte vermindern aber die Kräfte, die zum Eintreiben des Befestigungsmittels erforderlich sind und bedingen dadurch wiederum größere Kolbendurchmesser und größere Steuerventile. Diese Nachteile summieren sich natürlich mit zunehmender Länge und zunehmendem Querschnitt der Befestigungsmittel.A wide variety of systems for returning the working piston to the top dead center position are known for pneumatically operated driving tools. However, all of these systems have two major disadvantages. This is because these systems require a significant amount of construction height or volume. Clamping or nailing devices, which are provided for fasteners up to a length of 100 to 120 mm, can still be designed so that an operator can carry and handle them. If, however, drive-in tools for fasteners with a length of 130 mm to about 200 mm were built with the previously known system, these tools could hardly be worn anymore and handled even less in a previously known manner. In addition, all previously known systems work with their working pistons during the driving-in process against more or less large restoring forces (spring or gas pressure). However, these restoring forces reduce the forces that are required to drive in the fastener and in turn require larger piston diameters and larger control valves. These disadvantages naturally add up with increasing length and cross section of the fastening means.

Aus der DE-B-1 170 338 ist auch bereits ein pneumatisches Eintreibwerkzeug bekannt, bei dem auf den Arbeitskolben beim Eintreibvorgang keine Rückstellkräfte einwirken. Bei diesem bekannten Eintreibwerkzeug wird der Rückhub des auf seiner Vorderseite mit der Außenluft in Verbindung stehenden Arbeitskolbens durch Erzeugung eines Unterdruckes auf der Rückseite des Arbeitskolbens mittels einer Düsenstrahlpumpe bewirkt, die mittel mittels eines Steuergliedes mit der Druckluftzuführleitung verbindbar ist. Wie leicht einzusehen ist, ist der theoretische höchstwert für den auf den Arbeitskolben ausgeübten Differenzdruck gleich dem atmospühärischen Druck, was für einen raschen Rückhub des Arbeitskolbens in seinen oberen Totpunkt jedoch unzureichend ist.A pneumatic driving tool is also known from DE-B-1 170 338, in which no restoring forces act on the working piston during the driving process. In this known driving tool, the return stroke of the working piston connected to the outside air on its front side is brought about by generating a negative pressure on the rear side of the working piston by means of a jet pump, which can be connected to the compressed air supply line by means of a control member. As can easily be seen, the theoretical maximum value for the differential pressure exerted on the working piston is equal to the atmospheric pressure, which, however, is insufficient for a quick return stroke of the working piston to its top dead center.

In den letzten Jahren hat beispielsweise der Bedarf an Nägeln mit einer Länge bis zu 200 mm erheblich zugenommen. Nägel dieser Länge mit einem Schaftdurchmesser von über 6 mm sind mit dem Handhammer nur unter großer körperlicher Anstrengung einzutreiben. Es besteht daher ein dringender Bedarf an geeignten Eintreibwerkzeugen für lange Befestigungsmittel. Andererseits müssen diese Eintreibwerkzeuge für lange Befestigungsmittel eine wesentlich größere Eintreibleistung besitzen als die bisher bekannten Eintreibwerkzeuge, wobei aber das Gewicht und die Baugröße dieser Werkzeuge Grenzen unterliegt, damit die Werkzeuge von einer Bedienungsperson getragen und in üblicher Weise bedient werden können.For example, the need for nails with a length of up to 200 mm has increased significantly in recent years. Nails of this length with a shaft diameter of over 6 mm can only be driven in with a hand hammer with great physical exertion. There is therefore an urgent need for suitable driving tools for long fasteners. On the other hand, these driving tools for long fasteners must have a much greater driving performance than the previously known driving tools, but the weight and size of these tools are subject to limits so that the tools can be carried by an operator and operated in the usual way.

Der Erfindung liegt daher die Aufgabe zugrunde, ein gattungsgemäßes Eintreibwerkzeug zu schaffen, das bei gleicher Baugröße wie vergleichbare herkömmliche Werkzeuge eine steigerte Eintreibleistung hat.The invention is therefore based on the object of providing a generic driving tool which, with the same size as comparable conventional tools, has an increased driving power.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß ein Hilfszylinder vorgesehen ist, in dem ein Kolben axial verschiebbar gelagert ist, und daß eine mit dem Kolben verbundene Kolbenstange mit der aus Arbeitskolben und Treiberblatt bestehenden Baueinheit in Eingriff bringbar ist, daß ein Hilfsventil vorgesehen ist, mit dem die Räume des Hilfszylinders beiderseits des Kolbens wechselweise mit der Atmosphäre und dem Druckluftvorratsraum verbindbar sind, daß der Arbeitszylinder in den Raum unter dem Arbeitskolben mit Abluftöffnungen versehen ist und daß das Steuerventil und das Hilfsventil über eine Kupplungseinrichtung derart miteinander gekuppelt sind, daß der Arbeitsraum des Zylinders mit dem Druckluftvorratsraum verbindbar ist, nachdem derjenige Raum des Hilfszylinders mit dem Druckluftvorratsraum verbunden wurde, dessen Beaufschlagung eine Bewegung des Kolbens in diejenige Endstellung bewirkt, in der dessen Kolbenstange mit der aus Arbeitskolben und Treiberblatt bestehenden Baueinheit außer Eingriff steht, und daß der andere Raum des Hilfszylinders mit dem Druckluftvorratsraum verbunden wird, nachdem der Arbeitsraum des Zylinders mit der Atmosphäre verbunden wurde, wodurch die Kolbenstange des Kolbens mit der aus Arbeitskolben und Treiberblatt bestehenden Baueinheit in Eingriff gelangt und diese in die Ausgangsstellung zurückführt.According to the invention, this object is achieved in that an auxiliary cylinder is provided in which a piston is mounted axially displaceably, and in that a piston rod connected to the piston can be brought into engagement with the structural unit consisting of working piston and driver blade with an auxiliary valve being provided with which the spaces of the auxiliary cylinder on both sides of the piston can be alternately connected to the atmosphere and the compressed air supply space, that the working cylinder is provided in the space under the working piston with exhaust air openings and that the control valve and the auxiliary valve are coupled to one another via a coupling device such that the working space of the Cylinder can be connected to the compressed air supply space after that space of the auxiliary cylinder has been connected to the compressed air supply space, the action of which causes the piston to move into the end position in which its piston rod is connected to the structure consisting of the working piston and driver blade is disengaged, and that the other space of the auxiliary cylinder is connected to the compressed air supply space after the working space of the cylinder has been connected to the atmosphere, whereby the piston rod of the piston engages with the assembly consisting of the working piston and the driver blade and brings them into the starting position leads back.

Durch diese Ausbildung des Eintreibwerkzeuges wird erreicht, daß dessen Arbeitskolben beim Arbeitshub keinerlei Rückstellkräfte überwinden muß. Die gesamte Arbeitsleistung des Werkzeugs steht daher zum Eintreiben des Befestigungsmittels zur Verfügung. Nach Ausführung des Arbeitshubs werden das Steuerventil und das Hilfsventil umgesteuert, so daß die Kolbenstange mit der aus dem Arbeitskolben und dem Treiberblatt gebildeten Baueinhaut in Eingriff gelangt und diese ohne Überwindung eines Gegendruckes in die Ausgangslage zurückbewegen kann. Der Hilfszylinder kann dabei innerhalb der üblichen Bauhöhe des Eintreibwerkzeugs angeordnet werden.This configuration of the driving tool ensures that its working piston does not have to overcome any restoring forces during the working stroke. The entire work of the tool is therefore available for driving in the fastener. After execution of the working stroke, the control valve and the auxiliary valve are reversed so that the piston rod engages with the building skin formed from the working piston and the driver blade and can move it back into the starting position without overcoming a counter pressure. The auxiliary cylinder can be arranged within the usual height of the driving tool.

Zweckmäßige Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Appropriate developments of the invention result from the subclaims.

In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt, die nachfolgend näher erläutert werden. Es zeigt

  • F i g. 1 einen vertikalen Schnitt durch ein pneumatisches Eintreibgerät gemäß einer ersten Ausführungsform der Erfindung,
  • F i g. 2 einen Schnitt ähnlich wie Fig. 1, wobei sich ein in einem Hilfszylinder angeordneter Kolben jedoch in seiner unteren Totpunktstellung befindet,
  • Fig. 3 einen vertikalen Schnitt durch ein pneumatisches Eintreibgerät gemäß einer zweiten Ausführungsform der Erfindung, und
  • Fig. 4 einen Schnitt ähnlich wie Fig. 3, wobei sich ein in einem Hilfszylinder angeordneter Kolben jedoch in seiner oberen Totpunktstellung befindet.
The drawing shows two exemplary embodiments of the invention, which are explained in more detail below. It shows
  • F i g. 1 shows a vertical section through a pneumatic driving tool according to a first embodiment of the invention,
  • F i g. 2 shows a section similar to FIG. 1, but with a piston arranged in an auxiliary cylinder in its bottom dead center position,
  • 3 shows a vertical section through a pneumatic driving tool according to a second embodiment of the invention, and
  • Fig. 4 is a section similar to Fig. 3, but with a piston arranged in an auxiliary cylinder but in its top dead center position.

Das in den Fig. 1 und 2 dargestellte pneumatische Eintreibgerät hat einen Hauptzylinder 8, in dem ein Arbeitskolben 3 axial verschiebbar ist. Der Arbeitskolben 3 ist mit einem Treiberblatt 7 starr verbunden, das in einem Eintreibkanal 4 geführt ist. Ein Hilfszylinder 1 ist derart parallel zum Eintreibkanal 4 angeordnet, daß die Bauhöhe des Gerätes nicht vergrößert wird. In dem Hilfszylinder 1 ist ein Kolben 11 verschiebbar gelagert, der mit einer Kolbenstange 2 starr verbunden ist. Die Kolbenstange 2 kann an der Unterseite des Arbeitskolbens 3 zur Anlage gebracht werden, um diesen nach Ausfühurng eines Arbeitshubs in seine obere Totpunktstellung zurückzubewegen. Die Kolbenstange 2 bewegt sich dabei parallel zum Treiberblatt 7 durch den Zylinder 8 hindurch. Der Hilfszylinder 1 wird über ein Hilfsventil 5 und ein Auslaßventil 6 derart gesteuert, daß er vor Beginn des Eintreibvorganges in seine eingefahrene Ausgangsstellung zurückläuft, so daß der Arbeitskolben 3 den Eintreibvorgang ohne entgegenwirkende Rückstellkräfte ausführen kann.The pneumatic driving tool shown in FIGS. 1 and 2 has a master cylinder 8, in which a working piston 3 is axially displaceable. The working piston 3 is rigidly connected to a driver blade 7, which is guided in an input channel 4. An auxiliary cylinder 1 is arranged parallel to the drive channel 4 such that the overall height of the device is not increased. A piston 11 is slidably mounted in the auxiliary cylinder 1 and is rigidly connected to a piston rod 2. The piston rod 2 can be brought to bear on the underside of the working piston 3 in order to move it back into its top dead center position after a working stroke. The piston rod 2 moves parallel to the driver blade 7 through the cylinder 8. The auxiliary cylinder 1 is controlled via an auxiliary valve 5 and an exhaust valve 6 such that it runs back into its retracted starting position before the start of the driving-in process, so that the working piston 3 can carry out the driving-in process without counteracting restoring forces.

Die Kolbenstange 2 besteht aus einem Rohr, in dem ein an der Unterseite des Arbeitskolbens 3 zur Anlage bringbarer Berührungsstift 9 unter dem Druck einer Feder 10 gelagert ist.The piston rod 2 consists of a tube in which a contact pin 9, which can be brought into abutment on the underside of the working piston 3, is mounted under the pressure of a spring 10.

Das Auslaßventil 6 ist im Boden des Hilfszylinders 1 angeordnet und gibt beim Aufsetzen des Eintreibgerätes auf ein Werkstück zusätzlich zu dem Hilfsventil 5 einen verhältnismäßig großen Öffnungsquerschnitt frei. Vor Beginn des Eintreibvorganges wird daher der Kolben 11 des Hilfszylinders 1 unter dem Druck der kopfseitig über eine Leitung 12 mit dem Druckluftvorratsraum 13 verbundenen Druckluft in die untere Totpunktstellung verfahren.The outlet valve 6 is arranged in the bottom of the auxiliary cylinder 1 and, when the driving tool is placed on a workpiece, releases a relatively large opening cross section in addition to the auxiliary valve 5. Before the driving-in process begins, the piston 11 of the auxiliary cylinder 1 is therefore moved into the bottom dead center position under the pressure of the compressed air connected on the head side via a line 12 to the compressed air storage space 13.

Andererseits wird das Hilfsventil 5 über einen Nocken 14 des Werkstückkontaktschiebers 15 derart gesteuert, daß der unter dem Kolben 11 befindliche Raum des Hilfszylinders 1 beim Aufsetzen des Eintreibgerätes auf ein Werkstück entlüftet wird. Nach weiterer axialer Verschiebung des Kontaktschiebers 15 wird ein dem Hauptsteuerventil 19 zugeordnetes Fingerauslöseventil 17 über einen Bügel 16 aktiviert. Nach Betätigen eines Fingerauslösehebels 18 wird das Hauptsteuerventil 19 geöffnet, und die im Vorratsraum 13 des Eintreibgerätes befindliche Druckluft kann in den Arbeitsraum 26 des Zylinders 8 über dem Arbeitskolben 3 einströmen. Nach dem Abheben des Eintreibgerätes vom Werkstück, d. h. nach Entlastung des Kontaktschiebers 15 und des Fingerauslöseventils 17 wird das Hilfsventil 5 über den Nocken 14 des Kontaktschiebers 15 umgesteuert, und das Auslaßventil 6 wird geschlossen, so daß Druckluft über Leitungen 20 vom Luftvorratsraum 13 in den unter dem Kolben 11 befindlichen Raum des Hilfszylinders 1 gelangen kann. Der Kolben 11 wird infolge seines bodenseitig größeren Querschnittes in die obere Stellung verschoben, wodurch der Arbeitskolben 3 gleichfalls nach oben verschoben wird, da durch die inzwischen zwangsläufig erfolgte Umsteuerung des Hauptsteuerventils 19 die über dem Arbeitskolben 3 befindliche Druckluft über Bohrungen 21 entweichen konnte.On the other hand, the auxiliary valve 5 is controlled via a cam 14 of the workpiece contact slide 15 in such a way that the space of the auxiliary cylinder 1 located under the piston 11 is vented when the driving tool is placed on a workpiece. After further axial displacement of the contact slide 15, a finger trigger valve 17 assigned to the main control valve 19 is activated via a bracket 16. After actuating a finger release lever 18, the main control valve 19 is opened, and the compressed air located in the storage space 13 of the driving tool can flow into the working space 26 of the cylinder 8 above the working piston 3. After lifting the driving tool from the workpiece, d. H. after relief of the contact slide 15 and the finger release valve 17, the auxiliary valve 5 is reversed via the cams 14 of the contact slide 15, and the outlet valve 6 is closed, so that compressed air passes through lines 20 from the air supply space 13 into the space of the auxiliary cylinder 1 located under the piston 11 can. The piston 11 is displaced into the upper position due to its larger cross-section on the bottom, as a result of which the working piston 3 is also displaced upward, since the inevitable reversal of the main control valve 19 enabled the compressed air located above the working piston 3 to escape through holes 21.

Am oberen Ende des Hauptzylinders 8 ist eine Unterdruck-Haltevorrichtung 22 vorgesehen, in die ein mit einem Dichtelement 23 versehener oberer Ansatz 24 des Arbeitskolbens 3 in der oberen Totpunktstellung des Arbeitskolbens eingefahren wird. Diese Unterdruck-Haltevorrichtung 22 ist mit einem Rückschlagventil 25 versehen, so daß beim Einfahren des Ansatzes 24 des Arbeitskolbens 3 die im Arbeitsraum 26 befindliche Luft in die über dem Arbeitskolben 3 befindliche Kammer 28 gelangen kann. Da diese Kammer 28 bei geöffnetem Hauptsteuerventil 1 mit der Atmosphäre verbunden ist, kann die Luft ins Freie entweichen. Beim Beginn des Eintreibvorganges wird der Arbeitskolben 3 infolge der auf seine Außenfläche einwirkenden Druckluft mit seinem Ansatz 24 aus der Unterdruckkammer herausgezogen. Da das Rückschlagventil 25 dabei geschlossen bleibt, bildet sich in der Unterdruckkammer ein Unterdruck. Dieser Unterdruck hält den Arbeitskolben 3 solange fest, bis im Arbeitsraum über der Außenfläche des Arbeitskolbens 3 ein ausreichend großer Luftdruck gespeichert ist, woraufhin der Ansatz 24 des Arbeitskolbens 3 vollständig aus der Unterdruckkammer 22 gerissen wird. Dadurch wird eine hohe Anfangsbeschleunigung des Arbeitskolbens 3 erzielt.At the upper end of the master cylinder 8, a vacuum holding device 22 is provided, into which an upper shoulder 24 of the working piston 3 provided with a sealing element 23 is inserted in the upper dead center position of the working piston. This vacuum holding device 22 is provided with a check valve 25 so that when the extension 24 of the working piston 3 is retracted, the air in the working space 26 can get into the chamber 28 located above the working piston 3. Since this chamber 28 is connected to the atmosphere when the main control valve 1 is open, the air can escape to the outside. At the beginning of the driving-in process, the working piston 3 is pulled out of the vacuum chamber with its attachment 24 as a result of the compressed air acting on its outer surface. Since the check valve 25 remains closed, a vacuum is formed in the vacuum chamber. This negative pressure holds the working piston 3 until a sufficiently large air pressure is stored in the working space above the outer surface of the working piston 3, whereupon the extension 24 of the working piston 3 is completely torn out of the vacuum chamber 22. A high initial acceleration of the working piston 3 is thereby achieved.

Im Hauptzylinder 8 sind unter der unteren Totpunktstellung des Arbeitskolbens 3 große Abluftöffnungen 27 angeordnet. Der Arbeitskolben 3 kann daher den Arbeitshub ausführen, ohne gegen große Rückstellkräfte arbeiten zu müssen, weil die unter dem Arbeitskolben 3 befindliche atmosphärische Luft durch die Abluftöffnungen 27 ungehindert entweichen kann. Dem Arbeitskolben 3 stehen daher abgesehen von seiner Reibung an der Wand des Zylinders 8 und dem Reibungswiderstand des Befestigungsmittels keine größeren Kräfte entgegen als beim freien Flug.In the master cylinder 8 3 large exhaust air openings 27 are arranged under the bottom dead center position of the working piston. The working piston 3 can therefore perform the working stroke without having to work against large restoring forces, because the atmospheric air located under the working piston 3 can escape through the exhaust air openings 27 unhindered. Apart from its friction on the wall of the cylinder 8 and the frictional resistance of the fastening means, the working piston 3 is therefore not subject to any greater forces than during free flight.

Bei der in den F i g. 3 und 4 gezeigten zweiten Ausführungsform eines Eintreibgerätes ist der Hilfszylinder 1, der die gleiche Aufgabe erfüllt wie bei der vorstehend beschriebenen ersten Ausführungsform, im Gehäusekörper angeordnet. Die Rückführung des Arbeitskolbens 3 in die obere Totpunktstellung wird gleichfalls über die Kolbenstange 2 des Hilfszylinders 1 bewirkt. Zu diesem Zweck ist dei Kolbenstange 2 an einem Hebel 30 angelenkt, dessen vorderes, vom Drehpunkt des Hebels 30 abgewandtes Ende 31 eine seitliche Vorstehnase 32 des Treiberblattes 7 untergreift. Der Hilfszylinder 1 wird wie bei der ersten Ausführungsform derart gesteuert, daß der Rückstellhebel 30 vor Beginn des Eintreibvorganges aus dem Bereich der am Treiberblatt 7 befestigten Vorstehnase 32 so ausgeschwenkt ist daß er diese nicht berührt, wenn der Arbeitskolben 3 in der unteren Totpunktstellung angekommen ist.In the in the F i g. 3 and 4 shown second embodiment of a driving tool is the Auxiliary cylinder 1, which fulfills the same task as in the first embodiment described above, arranged in the housing body. The return of the working piston 3 to the top dead center position is also effected via the piston rod 2 of the auxiliary cylinder 1. For this purpose, the piston rod 2 is articulated on a lever 30, the front end 31 of which, facing away from the pivot point of the lever 30, engages under a lateral protruding nose 32 of the driver blade 7. As in the first embodiment, the auxiliary cylinder 1 is controlled such that the reset lever 30 is pivoted out of the area of the protruding nose 32 fastened to the driver blade 7 so that it does not touch it when the working piston 3 has reached the bottom dead center position.

Claims (6)

1. An air-powered driving tool, more specifically for long fixing parts, comprising a cyclinder (8) in which a working piston (3) is suported for axial displacement, a driving plate (7) guided in a driving barrel (4) and fixedly joined with said working piston (3), and a manually operable control valve (19) for joining the working space (26) of said cylinder (8) selectively with the atmosphere or with a compressed air storing space (13), characterized in that an auxiliary cylinder (1) is provided, with a piston (11) axially displaceable therein, that a piston rod (2) joined with said piston (11) can be made to engage in a structural unit made up of said working piston (3) and said driving blade (7), that au auxiliary valve (5, 6) is provided for alternately connecting the spaces of said auxiliary cylinder (1) on the two sides of said piston (11) to the atmosphere and to said compressed air storing space, that said cylinder (8) has air let-off openings (27) in the space under said working piston (3), and in that said control valve (19) and said auxiliary valve (5, 6) are so coupled via a coupling means (15, 16) that the working space (26) of said cylinder (8) can be connected to said compressed air storing space (13) after that space of said auxiliary cylinder (1) has been connected with the compressed air storing space (13) whose operation causes the piston (11) to move into that end position in which its piston rod (2) is chleared from the structural unit made up of said working piston (3) and said driving blade (7), and in that said other space of said auxiliary cylinder (1) is connected with the compressed air storing space (13) after the working space (26) of said cylinder (8) has been connected with the atmosphere, whereby said piston rod (2) of said piston (1) is drivingly connected with said structural unit made up of said working piston (3) and said driving blade (7) to return this structural unit into the starting position.
2. A driving tool according to claim 1, characterized in that said coupling means is in the form of a workpiece sensing slide (15).
3. A driving tool according to claim 1 or 2, characterized in that said auxiliary cylinder (1) extends in parallel relation to said cylinder (8), and in that said piston rod (2) is of a hollow structure and contains a feeler pin (9) which is acted upon by the force of a spring (10) so as to engage the lower side of said piston rod (3).
4. A driving tool according to claim 3, characterized in that said auxiliary cylinder (1) has an outlet valve (6) adapted to engage said workpiece for opening.
5. A driving tool according to claim 1 or 2, characterized in that said piston rod (2) is hinged to a reset lever (30) the free end (31 of which adapted to engage a nosepiece (32) of said driving blade (7).
6. A driving tool according to one of claims 1 to 5, characterized in that a vaccum holding means (22) is provided at the upper end of said cylinder (8), a top shoulder (24) - having a seal element (23) - of said working piston (3) being movable into said vaccum holding means in the top dead center position, and in that said vacuum holding means (22) is provided with a check valve (25) opening to the atmosphere.
EP80106979A 1979-11-16 1980-11-12 Pneumatic driving tool, especially for long fasteners Expired EP0029210B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2946387A DE2946387C2 (en) 1979-11-16 1979-11-16 Pneumatically actuated driving tool
DE2946387 1979-11-16

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EP0029210A1 EP0029210A1 (en) 1981-05-27
EP0029210B1 true EP0029210B1 (en) 1984-02-01

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EP80106979A Expired EP0029210B1 (en) 1979-11-16 1980-11-12 Pneumatic driving tool, especially for long fasteners

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US (1) US4380313A (en)
EP (1) EP0029210B1 (en)
JP (1) JPS56126589A (en)
DE (1) DE2946387C2 (en)

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US6041603A (en) * 1997-12-31 2000-03-28 Porter-Cable Corporation Internal combustion fastener driving tool accelerator plate
US6158643A (en) * 1997-12-31 2000-12-12 Porter-Cable Corporation Internal combustion fastener driving tool piston and piston ring
US6045024A (en) * 1997-12-31 2000-04-04 Porter-Cable Corporation Internal combustion fastener driving tool intake reed valve
USD410182S (en) 1997-12-31 1999-05-25 Porter-Cable Corporation Internal combustion fastener driving tool
US6016946A (en) * 1997-12-31 2000-01-25 Porter-Cable Corporation Internal combustion fastener driving tool shuttle valve
US6260519B1 (en) * 1997-12-31 2001-07-17 Porter-Cable Corporation Internal combustion fastener driving tool accelerator plate
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US6164510A (en) * 1998-06-03 2000-12-26 Illinois Tool Works Inc. Nosepiece shield for combustion powered tool
CA2306618C (en) * 1999-05-18 2005-06-28 Illinois Tool Works Inc. Nosepiece shield for combustion powered tool
DE20110754U1 (en) * 2001-06-28 2001-10-18 Prebena Wilfried Bornemann, 63679 Schotten Network-independent driving tool for fasteners
US6481612B1 (en) * 2002-04-02 2002-11-19 Peter G. Mangone, Jr. Fastening device delivery tool with perpendicular ram driven by a repeatable arcuate force member
CN103707266B (en) * 2014-01-10 2015-07-22 浙江荣鹏气动工具有限公司 Pneumatic nail gun
US11819989B2 (en) 2020-07-07 2023-11-21 Techtronic Cordless Gp Powered fastener driver
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Also Published As

Publication number Publication date
DE2946387A1 (en) 1981-05-27
EP0029210A1 (en) 1981-05-27
US4380313A (en) 1983-04-19
DE2946387C2 (en) 1986-04-10
JPS56126589A (en) 1981-10-03

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