EP0359974B1 - Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil - Google Patents
Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil Download PDFInfo
- Publication number
- EP0359974B1 EP0359974B1 EP89114695A EP89114695A EP0359974B1 EP 0359974 B1 EP0359974 B1 EP 0359974B1 EP 89114695 A EP89114695 A EP 89114695A EP 89114695 A EP89114695 A EP 89114695A EP 0359974 B1 EP0359974 B1 EP 0359974B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- piston
- venting
- main valve
- impacting apparatus
- 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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- 238000013022 venting Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000003116 impacting effect Effects 0.000 claims 8
- 238000009423 ventilation Methods 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- 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 pneumatic impact device according to the preamble of claim 1.
- 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. With the device at rest the top of the main valve is pressurized with compressed air. As soon as a working stroke is to be drawn, the top of the valve is relieved of the compressed air.
- 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.
- EP-A-0 052 368 shows a known embodiment of an impact device, in which a connecting channel in the form of a pipe piece is also used to conduct compressed air to the top of the main valve deflected an additional device and passed through a hole back into the housing interior and on the top of the main valve.
- the additional device consists of a valve in the form of a cover-like housing with a central opening.
- a valve plate made of flexible material of spherical shape is arranged within the space formed thereby. In the starting position, the valve plate rests in a correspondingly shaped curvature of the housing cover and is pressed upwards against a ventilation hole by compressed air from the connecting channel.
- GB-A-2 188 582 shows an impact device of the type mentioned at the outset, in which the venting valve, which can be controlled by the release valve, is pressed into the closed position in the form of a stepped piston by compressed air, supported by a helical spring.
- the compressed air acting on the upper side of the cover-like main valve is guided along the stepped piston during the closed position of the vent valve and bores branching through its movement space into the movement space above the main valve.
- the flow resistance is high.
- the stepped piston with its long length and mass due to its design must be pushed back against the force of the coil spring and against the air pressure acting on a central collar. This process can therefore not be done at the desired speed. The result is a less rapid opening of the main valve; combined with a correspondingly lower impact force of the working piston.
- the top of the main valve is also constantly pretensioned by a valve closing spring in these designs. 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. In this way, an undesired triggering of a driving impact of the piston and the associated risk of injury are avoided.
- the stress on the valve closing spring increases with the speed of the valve movements. Broken valve springs are therefore often the result. They lead to destruction of the neighboring parts of the device and are therefore a safety risk that must be taken into account when increasing the impact.
- the invention has for its object to provide an impact device according to the generic term mentioned above, the impact force is increased compared to previously known designs.
- the invention solves the problem with the features of claim 1.
- 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 triggering a working stroke.
- annular disk spring made of plastic, which consists, for example, 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.
- the working cylinder 2 with the working piston 3 is arranged in the head region of the device housing 1.
- the working plunger 4 is attached to the underside of the working piston.
- the device housing 1 is closed in its head area 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 serves as freedom of movement for carrying out the valve movements. Via a central bore 9 and housing bores 10 communicating therewith, the cylinder space can be vented during the return stroke of the working piston.
- 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 trigger valve 13 consists of a cylindrical insert with a compressed air bore 16 and a valve piston 17, which is provided with longitudinal ventilation grooves, via which the connecting channel 12 can be vented to the outside.
- the release piston 17 In its lower end position, i.e. when the release lever 18 is relieved, the release piston 17 is in its lower end position, so that the compressed air bore 16 can communicate with the connection channel 12 via connection bores 20 and the annular space 19.
- the connecting channel 12 is vented via the annular space 19 and the connecting bores 20 of the trigger valve in connection with the longitudinal grooves of the valve piston 17.
- the cylindrical widening 21 is connected to the outside air via a vent hole 24.
- the stepped piston is provided with a central vent hole 25, 25a, which opens laterally into an annular space 26 which is formed by the stepped piston in its area of smaller diameter with the wall of the cylindrical widening 21.
- 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 the stepped piston 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 required for displacement can be formed more quickly when the connecting channel 12 is vented.
- the ring surface thus ensures a very fast switching movement of the stepped piston.
- the movable parts are each shown 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 has reached the upper position (FIG. 2). It engages with its conical end in the sealing ring 29 and closes off the vent opening 24.
- the pressure of the compressed air reservoir 15 in the housing 1 continues via the connecting channel 12, the cylindrical extension 21 into the movement space 8 above the main valve 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). This definitely prevents the formation of a vacuum between the valve spring and the housing cover.
- the valve closing spring 11 can not suck up. The same effect is achieved if the valve closing spring 11 itself is provided with a radially extending 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)
Description
- Die Erfindung betrifft ein druckluftbetriebenes Schlaggerät nach dem Oberbegriff des Anspruchs 1.
- 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, wie die EP-A-0 052 368, DE-A-33 41 980, US-A-4 550 643 und GB-A-2 188 582 zeigen. 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.
- 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. Bei einigen Ausführungen wird die Druckluft 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 ausgelost 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. Eine bekannte Ausführung eines Schlaggerätes, bei dem ebenfalls ein Verbindungskanal in Form eines Rohrstücks verwendet wird, um Druckluft auf die Oberseite des Hauptventils zu leiten, zeigt die EP-A-0 052 368. Hierbei verläßt die Druckluft den oberen Gehäuseabschluß nach außen und wird durch eine Zusatzeinrichtung umgelenkt und durch eine Bohrung wieder in den Gehäuseinnenraum und auf die Oberseite des Hauptventils geführt. Die Zusatzeinrichtung besteht aus einem Ventil in Gestalt eines deckelartigen Gehäuhäuses mit einer Mittenöffnung. Innerhalb des dadurch gebildeten Raumes ist eine Ventilplatte aus flexiblem Material sphärischer Gestalt angeordnet. Die Ventilplatte ruht in der Ausgangsstellung in einer entsprechend geformten Wölbung des Gehäusedeckels und wird durch Druckluft des Verbindungskanals nach oben gegen eine Entlüftungsbohrung gedrückt. Dabei entsteht ein Kanal, der die Luft aus dem Verbindungskanal über eine weitere Bohrung zurück in das Gehäuse und auf die Oberseite des Hauptventils führt. Dadurch soll eine hohe Schaltgeschwindigkeit erreichbar sein, obgleich der Fertigungsaufwand hierfür sehr hoch ist. Im allgemeinen wird das Ausströmen der Druckluft von der Ventiloberseite über den Verbindungskanal mit mehrfachen Umlenkungen 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 GB-A-2 188 582 zeigt ein Schlaggerät der eingangs genannten Gattung, bei dem das von dem Auslöseventil steuerbare Entlüftungsventil in Form eines Stufenkolbens durch Druckluft, unterstützt von einer Schraubenfeder, in die Schließposition gedrückt wird. Die die Oberseite des deckelartigen Hauptventils beaufschlagende Druckluft wird während der Schließstellung des Entlüftungsventils am Stufenkolben entlang und über dessen Bewegungsraum abzweigende Bohrungen in den Bewegungsfreiraum oberhalb des Hauptventils geleitet. Der Strömungswiderstand ist hoch. Zum öffnen des Entlüftungsventils ist der Stufenkolben mit konstruktionsbedingter großer Länge und Masse gegen die Kraft der Schraubenfeder und gegen den an einem mittleren Bund wirkenden Luftdruck zurückzuschieben. Dieser Vorgang kann deshalb nicht mit der gewünschten Geschwindigkeit geschehen. Die Folge ist eine minder rasche Öffnung des Hauptventils; verbunden mit entsprechend geringerer Schlagkraft des Arbeitskolbens.
- Die Oberseite des Hauptventils steht bei diesen Bauformen 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 Beanspruchung der Ventilschließfeder steigt mit der Geschwindigkeit der Ventilbewegungen. Gebrochene Ventilfedern sind deshalb häufig die Folge. Sie führen zu Zerstörungen der benachbarten Geräteteile und sind deshalb ein Sicherheitsrisiko, das bei der Steigerung der Schlagkraft zu beachten ist.
- Der Erfindung liegt die Aufgabe zugrunde, ein Schlaggerät nach dem einleitend genannten Gattungsbegriff zu schaffen, dessen Schlagkraft im Vergleich mit bisher bekannten Ausführungen erhöht ist.
- Die Erfindung löst die Aufgabe mit den Merkmalen nach dem Anspruch 1.
- 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.
- 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.
- Weitere den Erfindungsgegenstand vorteilhaft gestaltende Merkmale sind in den Unteransprüchen angegeben.
- In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und nachstehend erläutert.
- 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. 5a - 5c
- die Ventilschließfeder des Hauptventils in der Seitenansicht und mit zwei Radialschnitten.
- Im Kopfbereich des Gerätegehäuses 1 ist der Arbeitszylinder 2 mit dem Arbeitskolben 3 angeordnet. An der Unterseite des Arbeitskolbens ist der 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 dient als Bewegungsfreiraum zur Durchführung der Ventilbewegungen. über ein 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. Das Auslöseventil 13 besteht aus einem zylindrischen Einsatz mit einer Druckluftbohrung 16 und einem Ventilkolben 17, der mit längsgerichteten Entlüftungsnuten versehen ist, über welche der Verbindungskanal 12 nach außen entlüftet werden kann. In seiner unteren Endstellung, d.h. bei entlastetem Auslösehebel 18 befindet sich der Auslösekolben 17 in seiner unteren Endstellung, so daß die Druckluftbohrung 16 über Verbindungsbohrungen 20 und den Ringraum 19 mit dem Verbindungskanal 12 kommunizieren kann. Bei gezogenem Auslösehebel 18 wird dagegen der Verbindungskanal 12 über den Ringraum 19 und die Verbindungsbohrungen 20 des Auslöseventils in Verbindung mit den Längsnuten des Ventilkolbens 17 entlüftet.
- Innerhalb einer zylindrischen Verbreiterung 21 des Verbindungskanals 12 ist eine Zylinderlaufbüchse 22 für einen Stufenkolben 23 angeordnet (Fig. 2). Die zylindrische Verbreiterung 21 ist über eine Entlüftungsbohrung 24 mit der Außenluft verbunden. Der Stufenkolben ist mit einer zentralen Entlüftungsbohrung 25, 25a versehen, die seitlich in einen Ringraum 26 mündet, der durch den Stufenkolben in seinem Bereich geringeren Durchmessers mit der Wand der zylindrischen Verbreiterung 21 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 der Stufenkolben seine obere Endlage erreicht. Der übergang vom kleineren Durchmesser zum größeren Durchmesser des Stufenkolbens bildet eine Ringfläche 30, wodurch sich im Moment der Entlüftung des Verbindungskanals 12 die zur Verschiebung notwendige Kraft rascher wirkend bilden kann. Die Ringfläche sorgt somit für eine sehr schnelle Schaltbewegung des Stufenkolbens.
- In der 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 die obere Position (Fig. 2) erreicht hat. Er greift mit seinem konischen Ende 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 Hauptventils fort und belastet dieses in Schließstellung.
- 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 wird 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 Arbeitszylinder 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.
- 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).
Claims (8)
- Druckluftbetriebenes Schlaggerät, insbesondere zum Eintreiben von Befestigungsmitteln, wie Klammern und Nägeln, mit einem Gehäuse (1) zur Aufnahme eines in einem Zylinder (2) geführten Arbeitskolbens (3) und eines die Freigabe und das Schließen des gesamten Zylinderquerschnitts steuernden, deckelartigen Hauptventils (6), dessen Oberseite mit Druckluft beaufschlagbar und über ein von einem Auslöseventil (13) steuerbares stufenkolbenförmiges Entlüftungsventil (23, 24, 25, 29) durch Kurzschluß mit der Außenluft entlastbar ist und welches ständig unter der Vorspannung einer in Schließrichtung wirkenden Ventilfeder (11) steht, wobei das Auslöseventil mit Entlüftungskanälen (17a) für einen Verbindungskanal (12) versehen ist, der das Entlüftungsventil mit dem Ausloseventil verbindet, dadurch gekennzeichnet, daß das Entlüftungsventil (23, 24, 25, 29) im Bereich der Einmündung des Verbindungskanals (12) in einen Bewegungsfreiraum (8) oberhalb des Hauptventils (6) angeordnet ist, wobei innerhalb eines mit einer Durchmesservergrößerung versehenen zylindrischen Abschnitts (21) des Verbindungskanals (12) der Stufenkolben (23) mit einer Belüftungsbohrung (25, 25a) für das Hauptventil (6) und mit einer Dichtung (27) in seinem größeren Durchmesserbereich verschiebbar angeordnet ist, und daß der Verbindungskanalabschnitt (21) größeren Durchmessers eine von dem Stufenkolben verschließbare, nach außen geführte Entlüftungsöffnung (24) aufweist.
- Schlaggerät nach Anspruch 1, dadurch gekennzeichnet, daß der Stufenkolben (23) zur Abdichtung der Entlüftungsoffnung (24) mit einer konischen Anfasung (28) versehen ist, welche während der Kolbenschließstellung in einen die Entlüftungsöffnung einfassenden elastischen Dichtring (29) gepreßt wird.
- Schlaggerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in die zylindrische Erweiterung (21) des Verbindungskanals (12) eine Zylinderlaufbüchse (22) für den Stufenkolben eingesetzt ist.
- Schlaggerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der übergang zwischen den beiden unterschiedlichen Durchmessern des Stufenkolbens eine Ringfläche (30) zur Erzeugung der Kolbenschubkraft bildet.
- Schlaggerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß als Ventilschließfeder (11) eine ringförmige Scheibenfeder aus Kunststoff eingesetzt ist.
- Schlaggerät nach Anspruch 5, dadurch gekennzeichnet, daß die Ventilschließfeder aus Polyurethan besteht.
- Schlaggerät nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Anlagefläche der Ventilschließfeder am Gerätegehäuse mit wenigstens einer radial geführten Nut (31) versehen ist.
- Schlaggerät nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Ventilschließfeder mit wenigstens einer Entlastungsbohrung versehen ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3831607 | 1988-09-17 | ||
| DE3831607A DE3831607A1 (de) | 1988-09-17 | 1988-09-17 | Durch druckluft betriebenes schlaggeraet mit entlueftungsventil fuer das hauptventil |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0359974A2 EP0359974A2 (de) | 1990-03-28 |
| EP0359974A3 EP0359974A3 (de) | 1991-07-03 |
| EP0359974B1 true EP0359974B1 (de) | 1995-05-17 |
Family
ID=6363127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89114695A Expired - Lifetime EP0359974B1 (de) | 1988-09-17 | 1989-08-09 | Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5014898A (de) |
| EP (1) | EP0359974B1 (de) |
| DE (2) | DE3831607A1 (de) |
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| US11937816B2 (en) | 2021-10-28 | 2024-03-26 | Cilag Gmbh International | Electrical lead arrangements for surgical instruments |
| US12089841B2 (en) | 2021-10-28 | 2024-09-17 | Cilag CmbH International | Staple cartridge identification systems |
| US12432790B2 (en) | 2021-10-28 | 2025-09-30 | Cilag Gmbh International | Method and device for transmitting UART communications over a security short range wireless communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE547255A (de) * | ||||
| DE1478928A1 (de) * | 1965-02-04 | 1969-06-04 | Dieter Haubold Ind Nagelgeraet | Steuerventileinrichtung fuer ein mit Druckluft betriebenes Geraet zum Eintreiben von Befestigungsmitteln |
| AU411683B1 (en) * | 1966-05-24 | 1971-03-30 | Olin Mathieson Chemical Corporation | Piston return and buffer system |
| DE2223999C2 (de) * | 1972-05-17 | 1974-09-05 | Dieter Haubold Industrielle Nagelgeraete, 3005 Hemmingen-Westerfeld | Einlaß- und Auslaßventilanordnung für den Arbeitshubraum eines Druckluftnaglers |
| US3822819A (en) * | 1972-07-10 | 1974-07-09 | S Wilson | Fastener driving tool with improved valve |
| DE2757892B2 (de) * | 1977-12-24 | 1980-05-14 | Ingo Dipl.-Ing. Dipl.- Wirtsch.-Ing. 7000 Stuttgart Haeussermann | Federmembrane |
| US4549344A (en) * | 1980-11-19 | 1985-10-29 | Signode Corporation | Method of driving fasteners with a bumperless pneumatic gun |
| US4401251A (en) * | 1980-11-19 | 1983-08-30 | Signode Corporation | Bumperless gun nailer |
| US4370663A (en) * | 1980-12-03 | 1983-01-25 | Xerox Corporation | Thin body ink drop generator |
| DE3119956C2 (de) * | 1981-05-20 | 1984-11-22 | Joh. Friedrich Behrens AG, 2070 Ahrensburg | Schallgedämpftes Eintreibgerät für Befestigungsmittel |
| DE3227855A1 (de) * | 1982-07-26 | 1984-01-26 | Hilti AG, 9494 Schaan | Druckluftnagler |
| US4747338A (en) * | 1983-06-13 | 1988-05-31 | Sencorp | Pneumatic gun having improved firing valve |
| DE3341980A1 (de) * | 1983-11-21 | 1985-07-04 | Hilti Ag, Schaan | Druckluftnagler |
| US4550643A (en) * | 1984-05-02 | 1985-11-05 | Duo-Fast Corporation | Fastener driving tool |
| EP0205633B1 (de) * | 1985-06-21 | 1988-01-27 | Joh. Friedrich Behrens AG | Ventilanordnung |
| US4784308A (en) * | 1986-04-03 | 1988-11-15 | Duo-Fast Corporation | Fastener driving tool |
| US4821941A (en) * | 1987-08-18 | 1989-04-18 | Senco Products, Inc. | Power regulator for a pneumatic fastener driving tool |
-
1988
- 1988-09-17 DE DE3831607A patent/DE3831607A1/de active Granted
-
1989
- 1989-08-09 DE DE58909233T patent/DE58909233D1/de not_active Expired - Fee Related
- 1989-08-09 EP EP89114695A patent/EP0359974B1/de not_active Expired - Lifetime
- 1989-09-15 US US07/407,892 patent/US5014898A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3831607A1 (de) | 1990-03-22 |
| EP0359974A2 (de) | 1990-03-28 |
| DE58909233D1 (de) | 1995-06-22 |
| US5014898A (en) | 1991-05-14 |
| DE3831607C2 (de) | 1992-11-12 |
| EP0359974A3 (de) | 1991-07-03 |
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