EP0359974A2 - Pneumatically operated driving-tool with a relief valve in the main valve - Google Patents
Pneumatically operated driving-tool with a relief valve in the main valve Download PDFInfo
- Publication number
- EP0359974A2 EP0359974A2 EP89114695A EP89114695A EP0359974A2 EP 0359974 A2 EP0359974 A2 EP 0359974A2 EP 89114695 A EP89114695 A EP 89114695A EP 89114695 A EP89114695 A EP 89114695A EP 0359974 A2 EP0359974 A2 EP 0359974A2
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- European Patent Office
- Prior art keywords
- valve
- piston
- impact device
- connecting channel
- main valve
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- 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.)
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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
- B25C1/042—Main valve and main cylinder
Definitions
- the invention relates to a compressed air-operated impact device, in particular for driving in fasteners, such as clamps and nails, with a housing for receiving a working piston guided in a cylinder and a cover-like main valve controlling the release and closing of the entire cylinder cross section, the top side of which via one to one Release valve leading connecting channel can be acted upon with compressed air and which is constantly under the pretension of a valve spring acting in the closing direction, the release valve being provided with ventilation channels for the connecting channel.
- the pressure of the working medium air can raise the main valve as soon as its upper side, that is the side facing away from the working cylinder, is relieved of the compressed air, which is also present here.
- the compressed air is supplied to the top of the main valve via a connecting channel, at the opposite end of which the air access can be controlled by a release valve.
- the connecting channel which ensures that the top of the valve is acted upon, is vented through vent holes.
- the triggering valve of the implement which connects the connection channel with ventilation holes in the triggering valve in the operating position, provides for the ventilation.
- the outflow of compressed air from the top of the valve via the connecting channel with multiple deflections is naturally made more difficult by flow resistances.
- the pressure on the top of the valve is therefore not abruptly reduced to the desired extent.
- the main valve cannot lift off at the desired acceleration.
- the inflow of compressed air into the working cylinder is delayed in a corresponding manner, so that the working piston also does not reach the desired high initial acceleration and thus final speed.
- the top of the valve is also constantly pretensioned by a valve closing spring. It must ensure that the main valve is kept closed in the rest position - even before the device is connected to a compressed air line. This prevents an undesired triggering of a driving impact of the piston and the associated risk of injury.
- the spring load increases with the speed of the valve movements. Broken valve springs are therefore often the result. They destroy the neighboring parts of the device and are therefore a safety risk.
- the invention has for its object to provide a striking device according to the generic term mentioned, the impact force is increased compared to previously known designs and in which the valve closing spring is designed in detail with the increase in stress so that greater durability and a safety risk is avoided by the faster valve movements.
- the solution according to the invention is characterized in that a vent valve which can be controlled by the pressure in the connecting channel in cooperation with the pressure on the upper side of the main valve is additionally arranged in the region of the junction of the connecting channel in a movement space above the main valve. It is thereby achieved that the compressed air can escape very quickly after the actuation of the release valve from the free space above the main valve, that is to say in a short circuit, since the outflowing compressed air is only opposed by a very low line resistance.
- the compressed air is no longer forced to travel the long way back through the connecting duct via the release valve.
- the main valve can be lifted off its seat on the working cylinder more quickly.
- the inflow cross section is completely released for the inflow of compressed air in a shorter time unit.
- the working piston is acted upon very quickly, ie almost suddenly by the working pressure of the compressed air, and can achieve a very high initial acceleration, so that the final speed on which the impact pulse depends is very high.
- a stepped piston with a ventilation hole for the main valve and with a seal in its larger diameter range within a cylindrical extension of the connecting channel with a lateral bore to the free space of the main valve, the cylindrical extension leading to the outside, which can be closed by the stepped piston Has ventilation opening.
- the ventilation Bore can start from the piston end facing the release valve and open into an annular space formed by the stepped piston and the piston guide.
- the vent opening is closed at the end by the step piston.
- the stepped piston is preferably provided with a conical chamfer, which is pressed into an elastic sealing ring surrounding the ventilation opening while the piston is in the closed position.
- a cylinder liner for piston guidance is preferably inserted into the cylindrical extension receiving the stepped piston.
- the stepped piston has an annular surface which, in cooperation with the compressed air, provides the necessary thrust when a working stroke is triggered.
- annular disk spring made of plastic, for example made of polyurethane, as the valve closing spring. It is of simple design and withstands the alternating loads with high accelerations better than one of the usual metal springs. Despite an increase in the speed of the alternating movements of the main valve, the safety risk of a spring break is avoided.
- a working cylinder 2 with a working piston 3 is arranged in the head region of the device housing 1.
- a working plunger 4 is attached to the underside of the working piston.
- the device housing 1 is closed in its head region by a housing cover 5, in which the main valve 6 is located. It is guided within a ring insert 7 and through partial contact with the walls of the housing cover.
- the space 8 inside the housing cover 5 serves as freedom of movement for carrying out the valve movements.
- the cylinder space can be vented during a return stroke of the working piston via a central bore 9 and housing bores 10 communicating therewith.
- a valve closing spring 11 in the form of a conical disc spring is arranged between the top of the main valve and the housing cover 5. The freedom of movement 8 above the main valve is connected to the release valve 13 via a connecting channel 12.
- the connecting channel 12 passes through the compressed air supply space 15 in the device housing.
- the compressed air is supplied to the storage space 15 via the connecting piece 40 for a supply line, not shown.
- a magazine 41 for receiving fastening means for example clips. They are after insertion into the magazine by a piston, the actuating handle is designated 42, under the action of the force of a spring 43 to the front in an input channel 44 pushed. Under the action of the driving or working ram 4, the fastening means are driven out of the driving channel 44 into a workpiece.
- the trigger valve 13 consists of a cylindrical insert 13a with a compressed air bore 16 and a valve piston 17 which is provided with longitudinal ventilation grooves 17a, via which the connecting channel 12 can be vented to the outside (FIG. 2).
- the valve piston 17 In its lower end position, i.e. H.
- the valve piston 17 In its lower end position, i.e. H.
- the connecting channel 12 is vented via the annular space 19, the transverse bores 20 of the trigger valve in connection with the longitudinal grooves 17a of the valve piston 17.
- a cylinder liner 22 for a stepped piston 23 can be arranged within a cylindrical extension 21 of the connecting channel 12 (FIG. 2).
- the cylindrical extension 21 is connected to the outside air via a vent hole 24.
- the stepped piston 23 is provided with a central vent hole 25, 25a which opens laterally into an annular space 26 which is formed by the stepped piston with the wall of the cylindrical extension 21 in the region of the smaller piston diameter.
- the stepped piston is equipped with a sealing ring 27 in its larger diameter range.
- the stepped piston is provided with a conical chamfer 28 which engages in a sealing ring 29 as soon as it reaches its upper end position.
- the transition from the smaller diameter to the larger diameter of the stepped piston forms an annular surface 30, as a result of which the force necessary for displacement is formed when pressure is applied.
- the movable parts are each half in the starting position and in the operating position.
- the starting position is shown from the left half of the picture.
- the main valve is in the lower position, while the stepped piston 23 assumes its upper position (FIG. 2). It engages with its conical end 28 in the sealing ring 29 and closes off the vent opening 24.
- the pressure of the compressed air supply space 15 in the housing 1 continues via the connecting channel 12, the cylindrical extension 21 into the movement space 8 above the skin valve 6 and loads it in the closed position.
- the trigger lever 18 As soon as the trigger lever 18 is pulled, it pushes the valve piston 17 into its upper position. As a result, the connecting channel 12 is vented. The pressure above the main valve affects the step piston and pushes it into its lower position. The vent 24 is released and the freedom of movement above the main valve is relieved of pressure by a short circuit with the outside air. At this moment, the air pressure of the compressed air supply space 15 can push the main valve 6 almost suddenly into its upper end position, the force of the valve closing spring 11 being overcome. The compressed air thus has access to the working cylinder on all sides and acts on the working piston 3, which is suddenly driven into its lower position. After the release lever 18 has been released, the underside of the stepped piston 23 can be loaded again and this can be pushed into its upper end position. The pressure continues again into space 8 above the main valve and can load it in the closing direction.
- valve closing spring 11 is the greater durability compared to conventional springs.
- the contact surface can be provided with a radially guided groove 31 (FIG. 2).
- the formation of a vacuum between the valve spring and the This reliably prevents the housing cover.
- the valve closing spring 11 can not suck up.
- the valve closing spring 11 itself is provided with a radial groove 11a or a simple bore 11b (FIGS. 5b and 5c)
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Die Erfindung betrifft ein druckluftbetriebenes Schlaggerät, insbesondere zum Eintreiben von Befestigungsmitteln, wie Klammern und Nägel, mit einem Gehäuse zur Aufnahme eines in einem Zylinder geführten Arbeitskolbens und eines die Freigabe und das Schließen des gesamten Zylinderquerschnitts steuernden, deckelartigen Hauptventils, dessen Oberseite über einen zu einem Auslöseventil führenden Verbindungskanal mit Druckluft beaufschlagbar ist und welches ständig unter der Vorspannung einer in Schließrichtung wirkenden Ventilfeder steht, wobei das Auslöseventil mit Entlüftungskanälen für den Verbindungskanal versehen ist.The invention relates to a compressed air-operated impact device, in particular for driving in fasteners, such as clamps and nails, with a housing for receiving a working piston guided in a cylinder and a cover-like main valve controlling the release and closing of the entire cylinder cross section, the top side of which via one to one Release valve leading connecting channel can be acted upon with compressed air and which is constantly under the pretension of a valve spring acting in the closing direction, the release valve being provided with ventilation channels for the connecting channel.
Bei Schlaggeräten, die durch Druckluft angetrieben werden, ist es bekannt, den gesamten Umfang des Arbeitszylinders für den Einlaß der Druckluft zu nutzen, um dadurch die gesamte Fläche des Arbeitskolbens möglichst gleichmäßig mit Druckluft zu beaufschlagen. Dadurch wird eine hohe Anfangsbeschleunigung und große Endgeschwindigkeit des Arbeitskolbens erreicht, so daß der von dem Arbeitsstößel auf ein Werkstück zu übertragenden Impuls hohe Werte erreicht. Das erfordert ein großflächiges, den Durchmesser des Arbeitszylinders übergreifendes Einlaßventil, das im allgemeinen als Hauptventil bezeichnet wird. Es schließt den Arbeitszylinder deckelartig ab und kann von diesem einige Millimeter angehoben werden.In the case of impact devices which are driven by compressed air, it is known to use the entire circumference of the working cylinder for the inlet of the compressed air, in order thereby to apply compressed air to the entire surface of the working piston as evenly as possible. As a result, a high initial acceleration and high final speed of the working piston are achieved, so that the momentum to be transmitted from the working ram to a workpiece reaches high values. This requires a large inlet valve spanning the diameter of the working cylinder, which is generally referred to as the main valve. It closes the working cylinder like a lid and can be lifted a few millimeters from it.
Der Druck des Arbeitsmittels Luft kann das Hauptventil anheben, sobald seine Oberseite, das ist die dem Arbeitszylinder abgekehrte Seite, von der Druckluft entlastet wird, die hier ebenfalls ansteht. Die Druckluft wird der Oberseite des Hauptventils über einen Verbindungskanal zugeführt, an dessen entgegengesetztem Ende der Luftzutritt durch ein Auslöseventil steuerbar ist. In Ruhestellung des Gerätes ist die Oberseite des Hauptventils von der Druckluft beaufschlagt.
Sobald ein Arbeitshub ausgelöst werden soll, wird die Ventiloberseite von der Druckluft entlastet. Zu diesem Zweck wird der Verbindungskanal, der für die Beaufschlagung der Ventiloberseite sorgt, durch Entlüftungsbohrungen entlüftet. Für die Entlüftung sorgt das Auslöseventil des Arbeitsgerätes, das in Betriebsstellung den Verbindungskanal mit Entlüftungsbohrungen im Auslöseventil verbindet. Das Ausströmen der Druckluft von der Ventiloberseite über den Verbindungskanal mit mehrfachen Umlenkungen wird naturgemäß durch Strömungswiderstände erschwert. Der Druck auf der Ventiloberseite wird daher nicht in dem gewünschten Maße schlagartig abgebaut. Folglich kann das Hauptventil nicht mit der gewünschten Beschleunigung abheben. Das Einströmen der Druckluft in den Arbeitszylinder wird in entsprechender Weise verzögert, so daß auch der Arbeitskolben nicht die gewünschte hohe Anfangsbeschleunigung und damit Endgeschwindigkeit erreicht.
Die Ventiloberseite steht zusätzlich ständig unter der Vorspannung einer Ventilschließfeder. Sie hat dafür zu sorgen, daß das Hauptventil in Ruhestellung - auch bereits vor dem Anschließen des Gerätes an eine Druckluftleitung - ständig geschlossen gehalten wird. Dadurch wird ein ungewolltes Auslösen eines Eintreibschlages des Kolbens und die damit verbundene Verletzungsgefahr vermieden. Die Federbeanspruchung steigt jeweils mit der Geschwindigkeit der Ventilbewegungen. Gebrochene Ventilfedern sind deshalb häufig die Folge. Sie führen zu Zerstörungen der benachbarten Geräteteile und sind deshalb ein Sicherheitsrisiko.The pressure of the working medium air can raise the main valve as soon as its upper side, that is the side facing away from the working cylinder, is relieved of the compressed air, which is also present here. The compressed air is supplied to the top of the main valve via a connecting channel, at the opposite end of which the air access can be controlled by a release valve. When the device is at rest, the top of the main valve is pressurized by the compressed air.
As soon as a working stroke is to be triggered, the top of the valve is relieved of the compressed air. For this purpose, the connecting channel, which ensures that the top of the valve is acted upon, is vented through vent holes. The triggering valve of the implement, which connects the connection channel with ventilation holes in the triggering valve in the operating position, provides for the ventilation. The outflow of compressed air from the top of the valve via the connecting channel with multiple deflections is naturally made more difficult by flow resistances. The pressure on the top of the valve is therefore not abruptly reduced to the desired extent. As a result, the main valve cannot lift off at the desired acceleration. The inflow of compressed air into the working cylinder is delayed in a corresponding manner, so that the working piston also does not reach the desired high initial acceleration and thus final speed.
The top of the valve is also constantly pretensioned by a valve closing spring. It must ensure that the main valve is kept closed in the rest position - even before the device is connected to a compressed air line. This prevents an undesired triggering of a driving impact of the piston and the associated risk of injury. The spring load increases with the speed of the valve movements. Broken valve springs are therefore often the result. They destroy the neighboring parts of the device and are therefore a safety risk.
Der Erfindung liegt die Aufgabe zugrunde, ein Schlaggerät nach dem einleitend genannten Gattungsbegriff zu schaffen, dessen Schlagkraft im Vergleich zu bisher bekannten Ausführungen erhöht ist und bei dem mit der Erhöhung der Beanspruchung eingehend die Ventilschließfeder so ausgebildet ist, daß eine größere Haltbarkeit erreicht und ein Sicherheitsrisiko durch die schnelleren Ventilbewegungen vermieden wird.
Die erfindungsgemäße Lösung zeichnet sich dadurch aus, daß im Bereich der Einmündung des Verbindungskanals in einen Bewegungsfreiraum oberhalb des Hauptventils zusätzlich ein vom Druck im Verbindungskanal im Zusammenwirken mit dem Druck auf der Oberseite des Hauptventils steuerbares Entlüftungsventil angeordnet ist. Dadurch wird erreicht, daß die Druckluft nach der Betätigung des Auslöseventils aus dem Bewegungsfreiraum oberhalb des Hauptventils, also im Kurzschluß, sehr rasch entweichen kann, da der ausströmenden Druckluft nur ein sehr geringer Leitungswiderstand entgegensteht. Die Druckluft ist nicht mehr gezwungen, den langen Weg durch den Verbindungskanal zurück über das Auslöseventil ins Freie zurückzulegen. Das Hauptventil kann dadurch rascher von seinem Sitz auf dem Arbeitszylinder abgehoben werden. Der Einströmquerschnitt wird in einer kürzeren Zeiteinheit vollständig für das Einströmen der Druckluft freigegeben. Der Arbeitskolben wird sehr rasch, d. h. fast schlagartig von dem Arbeitsdruck der Druckluft beaufschlagt und kann eine sehr hohe Anfangsbeschleunigung erreichen, so daß auch die Endgeschwindigkeit von der der Schlagimpuls abhängt sehr hoch ist.The invention has for its object to provide a striking device according to the generic term mentioned, the impact force is increased compared to previously known designs and in which the valve closing spring is designed in detail with the increase in stress so that greater durability and a safety risk is avoided by the faster valve movements.
The solution according to the invention is characterized in that a vent valve which can be controlled by the pressure in the connecting channel in cooperation with the pressure on the upper side of the main valve is additionally arranged in the region of the junction of the connecting channel in a movement space above the main valve. It is thereby achieved that the compressed air can escape very quickly after the actuation of the release valve from the free space above the main valve, that is to say in a short circuit, since the outflowing compressed air is only opposed by a very low line resistance. The compressed air is no longer forced to travel the long way back through the connecting duct via the release valve. As a result, the main valve can be lifted off its seat on the working cylinder more quickly. The inflow cross section is completely released for the inflow of compressed air in a shorter time unit. The working piston is acted upon very quickly, ie almost suddenly by the working pressure of the compressed air, and can achieve a very high initial acceleration, so that the final speed on which the impact pulse depends is very high.
Vorteilhaft ist es, innerhalb einer zylindrischen Erweiterung des Verbindungskanals mit einer seitlichen Bohrung zum Freiraum des Hauptventils einen Stufenkolben mit einer Belüftungsbohrung für das Hauptventil und mit einer Dichtung in seinem größeren Durchmesserbereich verschiebbar anzuordnen, wobei die zylindrische Erweiterung eine von dem Stufenkolben verschließbare, nach außen geführte Entlüftungsöffnung aufweist. Die Belüftungs bohrung kann ausgehen von dem dem Auslöseventil zugewandten Kolbenende und in einen vom Stufenkolben und der Kolbenführung gebildeten Ringraum münden. Die Entlüftungsöffnung wird stirnseitig von dem Stufenkolben verschlossen. Zur Abdichtung der Entlüftungsöffnung ist der Stufenkolben vorzugsweise mit einer konischen Anfasung versehen, welche während der Kolbenschließstellung in einen die Entlüftungsöffnung einfassenden elastischen Dichtring gepreßt wird. In die den Stufenkolben aufnehmende zylindrische Erweiterung wird vorzugsweise eine Zylinderlaufbüchse zur Kolbenführung eingesetzt. Der Stufenkolben weist eine Ringfläche auf, die im Zusammenwirken mit der Druckluft für die notwendige Schubkraft beim Auslösen eines Arbeitshubs sorgt.It is advantageous to arrange a stepped piston with a ventilation hole for the main valve and with a seal in its larger diameter range within a cylindrical extension of the connecting channel with a lateral bore to the free space of the main valve, the cylindrical extension leading to the outside, which can be closed by the stepped piston Has ventilation opening. The ventilation Bore can start from the piston end facing the release valve and open into an annular space formed by the stepped piston and the piston guide. The vent opening is closed at the end by the step piston. To seal the ventilation opening, the stepped piston is preferably provided with a conical chamfer, which is pressed into an elastic sealing ring surrounding the ventilation opening while the piston is in the closed position. A cylinder liner for piston guidance is preferably inserted into the cylindrical extension receiving the stepped piston. The stepped piston has an annular surface which, in cooperation with the compressed air, provides the necessary thrust when a working stroke is triggered.
Zur weiteren vorteilhaften Gestaltung des Erfindungsgegenstandes wird vorgeschlagen, als Ventilschließfeder eine ringförmige Scheibenfeder aus Kunststoff einzusetzen, die beispielsweise aus Polyurethan besteht. Sie ist von einfacher Ausbildung und hält den mit hohen Beschleunigungen versehenen Wechselbelastungen besser stand als eine der üblichen Metallfedern. Trotz einer Erhöhung der Geschwindigkeit der Wechselbewegungen des Hauptventils wird das Sicherheitsrisiko eines Federbruchs vermieden.For a further advantageous design of the subject matter of the invention, it is proposed to use an annular disk spring made of plastic, for example made of polyurethane, as the valve closing spring. It is of simple design and withstands the alternating loads with high accelerations better than one of the usual metal springs. Despite an increase in the speed of the alternating movements of the main valve, the safety risk of a spring break is avoided.
Weitere den Erfindungsgegenstand vorteilhaft gestaltende Merkmale sind in den Unteransprüchen angegeben.Further features which advantageously design the subject of the invention are specified in the subclaims.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und nachstehend erläutert.In the drawing, an embodiment of the invention is shown schematically and explained below.
Es zeigen:
- Fig. 1 die Gesamtansicht eines Schlaggerätes, z. T. im Schnitt,
- Fig. 2 einen Vertikalschnitt durch das Kopfteil des Schlaggerätes,
- Fig. 3 einen Ausschnitt des Gerätes nach Fig. 2 im Bereich des Entlüftungsventils mit dem Stufenkolben in der Schließstellung,
- Fig. 4 den Geräteausschnitt nach Fig. 3 mit dem Stufenkolben in seiner unteren, die Entlüftungsbohrung freigebenden Stellung und
- Fig. 5 die Ventilschließfeder des Hauptventils in der Seitenansicht und mit einem Radialschnitt.
- Fig. 1 shows the overall view of an impact device, for. T. on average,
- 2 shows a vertical section through the head part of the impact device,
- 3 shows a detail of the device according to FIG. 2 in the area of the vent valve with the stepped piston in the closed position,
- Fig. 4 shows the device section of Fig. 3 with the stepped piston in its lower position, the vent hole and
- Fig. 5 shows the valve closing spring of the main valve in a side view and with a radial section.
Im Kopfbereich des Gerätegehäuses 1 ist ein Arbeitszylinder 2 mit einem Arbeitskolben 3 angeordnet. An der Unterseite des Arbeitskolbens ist ein Arbeitsstößel 4 befestigt. Das Gerätegehäuse 1 ist in seinem Kopfbereich von einem Gehäusedeckel 5 abgeschlossen, in welchem sich das Hauptventil 6 befindet. Es ist innerhalb eines Ringeinsatzes 7 und durch teilweise Anlage an den Wänden des Gehäusedeckels geführt. Der Raum 8 innerhalb des Gehäusedeckels 5 dient als Bewegungsfreiraum zur Durchführung der Ventilbewegungen. Über eine zentrale Bohrung 9 und damit kommunizierende Gehäusebohrungen 10 kann der Zylinderraum beim Rückhub des Arbeitskolbens entlüftet werden. Zwischen der Oberseite des Hauptventils und dem Gehäusedeckel 5 ist eine Ventilschließfeder 11 in Form einer konischen Scheibenfeder angeordnet. Der Bewegungsfreiraum 8 oberhalb des Hauptventils ist über einen Verbindungskanal 12 mit dem Auslöseventil 13 verbunden. Mit Hilfe eines Rohres 14 durchsetzt der Verbindungskanal 12 den Druckluftvorratsraum 15 im Gerätegehäuse. Die Druckluft wird dem Vorratsraum 15 über den Anschlußstutzen 40 für eine nicht gezeigte Zuführleitung zugeführt. Unterhalb des Gerätegehäuses 1 und an diesem befestigt befindet sich ein Magazin 41 zur Aufnahme nicht dargestellter Befestigungsmittel, beispielsweise Klammern. Sie werden nach dem Einsetzen in das Magazin von einem Kolben, dessen Betätigungsgriff mit 42 bezeichnet ist, unter der Einwirkung der Kraft einer Feder 43 nach vorn in einen Eintreib kanal 44 geschoben. Unter der Wirkung des Eintreib- oder Arbeitsstößels 4 werden die Befestigungsmittel aus dem Eintreibkanal 44 in ein Werkstück getrieben.A working cylinder 2 with a working
Das Auslöseventil 13 besteht aus einem zylindrischen Einsatz 13a mit einer Druckluftbohrung 16 und einem Ventilkolben 17, der mit längsgerichteten Entlüftungsnuten 17a versehen ist, über welche der Verbindungskanal 12 nach außen entlüftet werden kann (Fig. 2). In seiner unteren Endstellung, d. h. bei entlastetem Auslösehebel 18 befindet sich der Ventilkolben 17 in seiner unteren Endstellung, so daß die Druckluftfbohrung 16 über Querbohrungen 20 und den Ringraum 19 mit dem Verbindungskanal 12 kommunizieren kann. Bei gezogenem Auslösehebel 18 wird dagegen der Verbindungskanal 12 über den Ringraum 19, die Querbohrungen 20 des Auslöseventils in Verbindung mit den Längsnuten 17a des Ventilkolbens 17 entlüftet.The
Innerhalb einer zylindrischen Erweiterung 21 des Verbindungskanals 12 kann eine Zylinderlaufbüchse 22 für einen Stufenkolben 23 angeordnet (Fig. 2) sein. Die zylindrische Erweiterung 21 ist über eine Entlüftungsbohrung 24 mit der Außenluft verbunden. Der Stufenkolben 23 ist mit einer zentralen Entlüftungsbohrung 25, 25a versehen, die seitlich in einen Ringraum 26 mündet, der durch den Stufenkolben mit der Wand der zylindrischen Erweiterung 21 im Bereich des geringeren Kolbendurchmessers gebildet wird. Der Stufenkolben ist in seinem größeren Durchmesserbereich mit einem Dichtring 27 bestückt. An seinem der Entlüftungsbohrung 24 zugewandten Ende ist der Stufenkolben mit einer konischen Anfasung 28 versehen, die in einen Dichtungsring 29 greift, sobald er seine obere Endlage erreicht. Der übergang vom kleineren Durchmesser zum größeren Durchmesser des Stufenkolbens bildet eine Ringfläche 30, wodurch sich bei Druckbeaufschlagung die zur Verschiebung notwendige Kraft bildet.A
In den Fig. 1 und 2 sind die bewegbaren Teile je zur Hälfte in der Ausgangsstellung und in der Betriebsstellung dargestellt. Die Ausgangsstellung wird jeweils von der linken Bildhälfte angezeigt. Dabei befindet sich das Hauptventil in der unteren Position, während der Stufenkolben 23 seine obere Position (Fig. 2) einnimmt. Er greift mit seinem konischen Ende 28 in den Dichtungsring 29 und sperrt die Entlüftungsöffnung 24 ab. Der Druck des Druckluftvorratsraumes 15 im Gehäuse 1 setzt sich über den Verbindungskanal 12, die zylindrische Erweiterung 21 in den Bewegungsfreiraum 8 oberhalb des Hautventils 6 fort und belastet dieses in Schließstellung.1 and 2, the movable parts are each half in the starting position and in the operating position. The starting position is shown from the left half of the picture. The main valve is in the lower position, while the stepped
Sobald der Auslösehebel 18 gezogen wird, drückt er den Ventilkolben 17 in seine obere Position. Dadurch wird der Verbindungskanal 12 entlüftet. Der Druck oberhalb des Hauptventils wirkt auf den Stufenkolben zurück und drückt diesen in seine untere Position. Die Entlüftungsöffnung 24 wird freigegeben und der Bewegungsfreiraum oberhalb des Hauptventils vom Druck durch Kurzschluß mit der Außenluft entlastet. In diesem Moment kann der Luftdruck des Druckluftvorratsraumes 15 das Hauptventil 6 fast schlagartig in seine obere Endposition drücken, wobei die Kraft der Ventilschließfeder 11 überwunden wird. Die Druckluft hat damit allseits Zutritt zum Arbeitszylindr und beaufschlagt den Arbeitskolben 3, der schlagartig in seine untere Position getrieben wird. Nach dem Lösen des Auslösehebels 18 kann die Unterseite des Stufenkolbens 23 erneut belastet und dieser in seine obere Endposition geschoben werden. Der Druck setzt sich wieder bis in den Raum 8 oberhalb des Hauptventils fort und kann dieses in Schließrichtung belasten.As soon as the
Der Vorteil der Ventilschließfeder 11 besteht in der größeren Haltbarkeit gegenüber herkömmlichen Federn. Um zu verhindern, daß die Ventilschließfeder 11 an ihrer Anlagefläche am Gehäusedeckel 5 infolge eines Unterdrucks hängenbleibt, kann die Anlagefläche mit einer radial geführten Nut 31 (Fig. 2) versehen sein. Die Bildung eines Vakuums zwischen Ventilfeder und dem Gehäusedeckel wird dadurch mit Sicherheit verhindert. Die Ventilschließfeder 11 kann sich also nicht festsaugen. Die gleiche Wirkung wird erreicht, wenn die Ventilschließfeder 11 selbst mit einer radial verlaufenden Nut 11a oder einer einfachen Bohrung 11b versehen wird (Figuren 5b und 5c)The advantage of the
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3831607 | 1988-09-17 | ||
DE3831607A DE3831607A1 (en) | 1988-09-17 | 1988-09-17 | STRIKE DEVICE OPERATED BY COMPRESSED AIR WITH BLEEDING VALVE FOR THE MAIN VALVE |
Publications (3)
Publication Number | Publication Date |
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EP0359974A2 true EP0359974A2 (en) | 1990-03-28 |
EP0359974A3 EP0359974A3 (en) | 1991-07-03 |
EP0359974B1 EP0359974B1 (en) | 1995-05-17 |
Family
ID=6363127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP89114695A Expired - Lifetime EP0359974B1 (en) | 1988-09-17 | 1989-08-09 | Pneumatically operated driving-tool with a relief valve in the main valve |
Country Status (3)
Country | Link |
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US (1) | US5014898A (en) |
EP (1) | EP0359974B1 (en) |
DE (2) | DE3831607A1 (en) |
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DE4213310A1 (en) * | 1992-04-23 | 1993-10-28 | Haubold Kihlberg Gmbh | Compressed air operated striker for driving nails or clips - has spring-loaded adjuster piston working with body of main valve and operating in bore in striker casing |
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Also Published As
Publication number | Publication date |
---|---|
DE3831607A1 (en) | 1990-03-22 |
EP0359974B1 (en) | 1995-05-17 |
US5014898A (en) | 1991-05-14 |
DE3831607C2 (en) | 1992-11-12 |
DE58909233D1 (en) | 1995-06-22 |
EP0359974A3 (en) | 1991-07-03 |
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