EP0152628B1 - Fastener driving tool, especially electro-tacker - Google Patents

Fastener driving tool, especially electro-tacker Download PDF

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Publication number
EP0152628B1
EP0152628B1 EP84116358A EP84116358A EP0152628B1 EP 0152628 B1 EP0152628 B1 EP 0152628B1 EP 84116358 A EP84116358 A EP 84116358A EP 84116358 A EP84116358 A EP 84116358A EP 0152628 B1 EP0152628 B1 EP 0152628B1
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EP
European Patent Office
Prior art keywords
housing
guide sleeve
exciter coil
compression spring
coil
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Expired
Application number
EP84116358A
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German (de)
French (fr)
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EP0152628A1 (en
Inventor
Manfred Dipl.-Ing. Buck
Wolfang Dipl.-Ing. Schmid
Karl Dr. Ing. Wanner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0152628A1 publication Critical patent/EP0152628A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

  • the invention relates to a driving tool for fasteners, such as clips, nails and the like.
  • a driving tool for fasteners such as clips, nails and the like.
  • an electric tacker the type specified in the preamble of claim 1.
  • the excitation coil of the electromagnet has an approximately yarn-roll-shaped coil body which receives the excitation winding and is attached to the housing on both end faces.
  • Such electric staplers generally work with pusher knife or pusher speeds of m, ax. 9 m / s.
  • a ram weight of approx. 150 g is required.
  • an acceleration time of the impact knife of approx. 0.01 s an average force on the ram or the impact knife of 135 N results, which results in a maximum force of 190 N with a time course of the force corresponding to the time course of the current.
  • the fastener i.e. the clamp or the nail
  • the tacker is accelerated forward again after the return movement has been caught by the operator's hand and struck on the workpiece .
  • the fastening means protrudes over the workpiece surface with an overhang that depends on the pressing force, while in the other case the tacking nose that hits the workpiece surface again causes ugly impressions there. In both cases, the work result is very poor.
  • the driving tool according to the invention for fasteners, such as clips or nails, with the characterizing features of claim 1 has the advantage that only a relatively small recoil force is exerted on the housing of the driving tool during the work process, which can be easily picked up by the operator.
  • the driving tool thus remains in constant contact with the workpiece, so that the fastening means are always driven in flush with the workpiece surface, regardless of the pressing force.
  • the work result achieved is always optimal. Impacts in the workpiece surface are safely excluded.
  • the back impulse exerted on the excitation coil when the impact knife accelerates gives the excitation coil a return speed of approx. 1 m / s.
  • the excitation coil has traveled a distance of approx. 10 mm at the point in time when the fastening means has just fully penetrated the workpiece.
  • the return spring exerts only a small force on the excitation coil and thus on the housing of the driving tool, so that the driving tool always remains in contact with the workpiece.
  • the movement of the excitation coil following the end of the driving-in process is determined by the progression of the spring characteristic of the return spring.
  • a steeply progressive spring characteristic saves installation space, but allows the driving tool to jump with a relatively low pressing force.
  • a weakly progressive spring characteristic curve requires more space, but has the advantage of a very low recoil.
  • the drawing shows a section of a longitudinal section of a driving device designed as an electric tacker for driving in fastening clips.
  • the electric tacker which can only be seen in detail in the drawing in longitudinal section as an example of a driving tool is generally known and e.g. described in detail in DE-OS 3 232 137 in structure and mode of operation.
  • the electric tacker has a housing 10 with an ejection channel 11, to which a fastening clip is successively fed from a magazine 12.
  • the feed mechanism of the individual fastening clips from the magazine 12 into the ejection channel 11 is also described in detail in the above-mentioned DE-OS, so that there is no need to go into this further.
  • a plunger or pusher knife 13 is guided in the housing 10 and protrudes into the ejection channel 11 and drives the fastening clip located in the ejection channel 11 into a workpiece onto which the ejection channel 11 is to be pressed.
  • the impact knife 13 is driven by an electromagnet 14 against the force of a return spring 15.
  • the electromagnet 14 has an excitation coil 16 and a magnet armature 17, which plunges into the central opening 18 of the excitation coil 16 and is guided axially displaceably therein.
  • the excitation coil 16 consists of an approximately yarn-roll-like coil body 19, which has two cylindrical projections 20, 21, each projecting on both end faces, and an excitation winding 22 received by the coil body 19.
  • the inner cylinder of the coil body 19 forms the central opening 18, in which the Shock knife 13 carrying magnet armature 17 is guided to be longitudinally displaceable.
  • the bobbin 19 is surrounded by an approximately cup-shaped guide sleeve 23 and projects with a cylindrical extension 20 into a cylindrical socket 24 which protrudes from the bottom of the guide sleeve 23.
  • the coil former 19 is fastened to the bottom 25 of the cylinder socket 24 by any fastening means, with the aid of which at the same time an annular elastic stop element lying on the opposite side of the bottom 25 26 is held. With this stop element 26, the bottom 25 of the guide sleeve 23 rests against an annular web 27 of the housing 10 when the electromagnet 14 is not excited.
  • the guide sleeve 23 is guided in a longitudinally displaceable manner in ribs 28 which are arranged distributed on the inner wall of the housing 10.
  • the open end face of the pot-shaped guide sleeve 23 is closed by an annular disk 29, which forms an additional mass, and is pressed onto the end edge 32 of the guide sleeve 23 by a return spring 30, which is designed here as a helical compression spring 31 surrounding the magnet armature 17 coaxially.
  • the annular disc 29 has a recess 33 which forms a support and centering surface for the helical compression spring 31.
  • the other side of the helical compression spring 31 is supported on the housing 10 via a damping element 34, here a damping rubber acting as an end stop.
  • the spring characteristic of the helical compression spring 31 is designed progressively. Depending on the needs at hand, the spring characteristic can be either steep or flat and / or strong or weakly progressive. With a steep spring characteristic, the installation space required for accommodating the helical compression spring 31 is small, but the contact pressure to be applied is still relatively high in order to prevent the electric tacker from jumping. In the second case, the additional construction volume for accommodating the helical compression spring 31 is considerably larger, but here one has the advantage of a very low recoil.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Die Erfindung betrifft ein Eintreibgerät für Befestigungsmittel, wie Klammern, Nägel und dgl., insbesondere einen Elektrotacker, der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a driving tool for fasteners, such as clips, nails and the like. In particular, an electric tacker, the type specified in the preamble of claim 1.

Bei einem bekannten Elektrotacker dieser Art, siehe DE-A1-3-232 137, weist die Erregerspule des Elektromagneten einen die Erregerwicklung aufnehmenden, etwa garnrollenförmigen Spulenkörper auf, der an beiden Stirnseiten am Gehäuse befestigt ist. Solche Elektrotacker arbeiten im allgemeinen mit Stossmesser- oder Stösselgeschwindigkeiten von m,ax. 9 m/s. Um mit dieser Geschwindigkeit eine Klammer eintreiben zu können, ist eine Stösselmasse von ca. 150 g erforderlich. Bei einer Beschleunigungszeit des Stossmessers von ca. 0,01 s ergibt sich eine mittlere Kraft auf den Stössel oder das Stossmesser von 135 N, was bei einem dem zeitlichen Verlauf des Stromes entsprechenden zeitlichen Verlauf der Kraft eine maximale Kraft von 190 N ergibt. Mit mindestens dieser Maximalkraft muss der Bedienende den Elektrotacker an das Werkstück andrücken, damit der Elektrotacker beim Arbeitsvorgang in Anlage zum Werkstück bleibt. Bringt der Bedienende diese Andrückkraft nicht auf, so wird einerseits das Befestigungsmittel, also die Klammer oder der Nagel, nicht mehr bündig zur Werkstückoberfläche eingeschlagen und andererseits der Tacker nach dem Abfangen der Rückbewegung durch die Hand des Bedienenden wieder nach vorn beschleunigt und auf das Werkstück aufgeschlagen. Im ersten Fall ragt das Befestigungsmittel mit einem von der Andrückkraft abhängenden Überstand über die Werkstückoberfläche vor, während im anderen Fall die auf die Werkstückoberfläche wieder auftreffende Tackernase dort hässliche Eindrücke verursacht. In beiden Fällen wird ein nur sehr mangelhaftes Arbeitsergebnis erzielt. Ausserdem ist es für den Bedienenden recht unangenehm, mit einem Tacker zu arbeiten, der entweder mit hoher Kraft angedrückt werden muss oder andernfalls regelrechte Bocksprünge ausführt.In a known electric tacker of this type, see DE-A1-3-232 137, the excitation coil of the electromagnet has an approximately yarn-roll-shaped coil body which receives the excitation winding and is attached to the housing on both end faces. Such electric staplers generally work with pusher knife or pusher speeds of m, ax. 9 m / s. In order to be able to drive in a clip at this speed, a ram weight of approx. 150 g is required. With an acceleration time of the impact knife of approx. 0.01 s, an average force on the ram or the impact knife of 135 N results, which results in a maximum force of 190 N with a time course of the force corresponding to the time course of the current. The operator must press the electric tacker onto the workpiece with at least this maximum force so that the electric tacker remains in contact with the workpiece during the work process. If the operator does not apply this pressure, on the one hand the fastener, i.e. the clamp or the nail, is no longer hammered in flush with the workpiece surface and on the other hand the tacker is accelerated forward again after the return movement has been caught by the operator's hand and struck on the workpiece . In the first case, the fastening means protrudes over the workpiece surface with an overhang that depends on the pressing force, while in the other case the tacking nose that hits the workpiece surface again causes ugly impressions there. In both cases, the work result is very poor. In addition, it is quite uncomfortable for the operator to work with a tacker that either has to be pressed down with high force or otherwise performs real leaps.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemässe Eintreibgerät für Befestigungsmittel, wie Klammern oder Nägel, mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass beim Arbeitsvorgang nur eine relativ geringe Rückstosskraft auf das Gehäuse des Eintreibgeräts ausgeübt wird, die vom Bedienenden spielend leicht aufgenommen werden kann. Das Eintreibgerät bleibt damit ständig in Kontakt mitdem Werkstück, so dass unabhängig von der Andrückkraft die Befestigungsmittel immer bündig zur Werkstückoberfläche eingeschlagen werden. Das erzielte Arbeitsergebnis ist immer optimal. Einschläge in der Werkstückoberfläche werden sicher ausgeschlossen.The driving tool according to the invention for fasteners, such as clips or nails, with the characterizing features of claim 1 has the advantage that only a relatively small recoil force is exerted on the housing of the driving tool during the work process, which can be easily picked up by the operator. The driving tool thus remains in constant contact with the workpiece, so that the fastening means are always driven in flush with the workpiece surface, regardless of the pressing force. The work result achieved is always optimal. Impacts in the workpiece surface are safely excluded.

Der beim Beschleunigen des Stossmessers auf die Erregerspule ausgeübte Rückimpuls erteilt der Erregerspule eine Rückgeschwindigkeit von ca. 1 m/s. Die Erregerspule hat zu dem Zeitpunkt, an dem das Befestigungsmittel gerade voll in das Werkstück eingedrungen ist, einen Weg von ca. 10 mm zurückgelegt. Auf den ersten Millimetern ihres Federweges übt die Rückholfeder nur eine geringe Kraft auf die Erregerspule und damit auf das Gehäuse des Eintreibgeräts auf, so dass das Eintreibgerät immer im Kontakt mit dem Werkstück bleibt. Der nach Beendigung des Eintreibvorgangs folgende Bewegungsvorgang der Erregerspule wird von der Progression der Federkennlinie der Rückholfeder bestimmt. Eine steil progressive Federkennlinie spart Bauraum, lässt aber bei relativ geringer Andrückkraft das Springen des Eintreibgeräts zu. Eine schwach progressive Federkennlinie benötigt zwar grösseren Bauraum hat aber den Vorteil eines sehr geringen Rückstosses.The back impulse exerted on the excitation coil when the impact knife accelerates gives the excitation coil a return speed of approx. 1 m / s. The excitation coil has traveled a distance of approx. 10 mm at the point in time when the fastening means has just fully penetrated the workpiece. During the first millimeters of its travel, the return spring exerts only a small force on the excitation coil and thus on the housing of the driving tool, so that the driving tool always remains in contact with the workpiece. The movement of the excitation coil following the end of the driving-in process is determined by the progression of the spring characteristic of the return spring. A steeply progressive spring characteristic saves installation space, but allows the driving tool to jump with a relatively low pressing force. A weakly progressive spring characteristic curve requires more space, but has the advantage of a very low recoil.

Zeichnungdrawing

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Dabei zeigt die Zeichnung ausschnittsweise einen Längsschnitt eines als Elektrotacker ausgebildeten Eintreibgeräts zum Einschlagen von Befestigungsklammern.The invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. The drawing shows a section of a longitudinal section of a driving device designed as an electric tacker for driving in fastening clips.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der in der Zeichnung im Längsschnitt nur ausschnittweise zu sehende Elektrotacker als Beispiel eines Eintreibgeräts ist allgemein bekannt und z.B. in der DE-OS 3 232 137 in Aufbau und Wirkungsweise ausführlich beschrieben.The electric tacker which can only be seen in detail in the drawing in longitudinal section as an example of a driving tool is generally known and e.g. described in detail in DE-OS 3 232 137 in structure and mode of operation.

Der Elektrotacker weist ein Gehäuse 10 mit einem Ausstosskanal 11 auf, dem sukzessive eine Befestigungsklammer aus einem Magazin 12 zugeführt wird. Der Zuführmechanismus der einzelnen Befestigungsklammern aus dem Magazin 12 in den Ausstosskanal 11 ist in der oben angegebenen DE-OS ebenfalls ausführlich beschrieben, so dass hierauf nicht weiter eingegangen zu werden braucht. Im Gehäuse 10 ist ein Stössel oder Stossmesser 13 geführt, das in den Ausstosskanal 11 hineinragt und die in dem Ausstosskanal 11 befindliche Befestigungsklammer in ein Werkstück, auf welches der Ausstosskanal 11 aufzupressen ist, eintreibt. Hierzu wird das Stossmesser 13 von einem Elektromagneten 14 entgegen der Kraft einer Rückstellfeder 15 angetrieben.The electric tacker has a housing 10 with an ejection channel 11, to which a fastening clip is successively fed from a magazine 12. The feed mechanism of the individual fastening clips from the magazine 12 into the ejection channel 11 is also described in detail in the above-mentioned DE-OS, so that there is no need to go into this further. A plunger or pusher knife 13 is guided in the housing 10 and protrudes into the ejection channel 11 and drives the fastening clip located in the ejection channel 11 into a workpiece onto which the ejection channel 11 is to be pressed. For this purpose, the impact knife 13 is driven by an electromagnet 14 against the force of a return spring 15.

Der Elektromagnet 14 weist eine Erregerspule 16 und einen Magnetanker 17 auf, der in die Zentralöffnung 18 der Erregerspule 16 eintaucht und in dieser axial verschieblich geführt ist. Die Erregerspule 16 besteht aus einem etwa garnrollenartigen Spulenkörper 19, der zwei jeweils an beiden Stirnseiten vorstehende zylinderförmige Ansätze 20, 21 aufweist, und aus einer von dem Spulenkörper 19 aufgenommenen Erregerwicklung 22. Der Innenzylinder des Spulenkörpers 19 bildet die Zentralöffnung 18, in welcher der das Stossmesser 13 tragende Magnetanker 17 längs verschieblich geführt ist. Der Spulenkörper 19 ist von einer etwa topfförmigen Führungshülse 23 umgeben und ragt mit einem zylinderförmigen Ansatz 20 in einen am Boden 25 der Führungshülse 23 einstückig von dieser wegstehenden Zylinderstutzen 24 hinein. Der Spulenkörper 19 ist am Boden 25 des Zylinderstutzens 24 durch beliebige Befestigungsmittel befestigt, mit deren Hilfe zugleich ein auf der gegenüberliegenden Seite des Bodens 25 liegendes ringförmiges elastisches Anschlagelement 26 gehalten wird. Mit diesem Anschlagelement 26 liegt der Boden 25 der Führungshülse 23 bei unerregtem Elektromagneten 14 in der Grundstellung an einem Ringsteg 27 des Gehäuses 10 an.The electromagnet 14 has an excitation coil 16 and a magnet armature 17, which plunges into the central opening 18 of the excitation coil 16 and is guided axially displaceably therein. The excitation coil 16 consists of an approximately yarn-roll-like coil body 19, which has two cylindrical projections 20, 21, each projecting on both end faces, and an excitation winding 22 received by the coil body 19. The inner cylinder of the coil body 19 forms the central opening 18, in which the Shock knife 13 carrying magnet armature 17 is guided to be longitudinally displaceable. The bobbin 19 is surrounded by an approximately cup-shaped guide sleeve 23 and projects with a cylindrical extension 20 into a cylindrical socket 24 which protrudes from the bottom of the guide sleeve 23. The coil former 19 is fastened to the bottom 25 of the cylinder socket 24 by any fastening means, with the aid of which at the same time an annular elastic stop element lying on the opposite side of the bottom 25 26 is held. With this stop element 26, the bottom 25 of the guide sleeve 23 rests against an annular web 27 of the housing 10 when the electromagnet 14 is not excited.

Die Führungshülse 23 ist in Rippen 28 längs verschieblich geführt, die an der Innenwand des Gehäuses 10 verteilt angeordnet sind. Die offene Stirnseite der topfförmigen Führungshülse 23 ist von einer Ringscheibe 29 abgeschlossen, die eine Zusatzmasse bildet und von einer Rückholfeder 30, die hier als eine den Magnetanker 17 koaxial umgebende Schraubendruckfeder 31 ausgebildet ist, auf den Stirnrand 32 der Führungshülse 23 aufgepresst wird. Die Ringscheibe 29 weist eine Ausnehmung 33 auf, die eine Auflage- und Zentrierfläche für die Schraubendruckfeder 31 bildet. Die Schraubendruckfeder 31 stützt sich mit ihrer anderen Stirnseite über ein Dämpfungselement 34, hier ein als Endanschlag fungierender Dämpfungsgummi, an dem Gehäuse 10 ab. Die Federkennlinie der Schraubendruckfeder 31 ist progressiv ausgelegt. Dabei kann je nach den vorliegenden Bedürfnissen die Federkennlinie entweder steil oder flach und/oder stark oder schwach progressiv sein. Mit steiler Federkennlinie ist der für die Aufnahme der Schraubendruckfeder 31 erforderliche Bauraum gering, jedoch ist die aufzubringende Anpresskraft, um ein Springen des Elektrotackers zu vermeiden, noch relativ hoch. Im zweiten Fall ist zwar das zusätzliche Bauvolumen zur Unterbringung der Schraubendruckfeder 31 wesentlich grösser, doch hat man hier den Vorteil eines recht geringen Rückstosses.The guide sleeve 23 is guided in a longitudinally displaceable manner in ribs 28 which are arranged distributed on the inner wall of the housing 10. The open end face of the pot-shaped guide sleeve 23 is closed by an annular disk 29, which forms an additional mass, and is pressed onto the end edge 32 of the guide sleeve 23 by a return spring 30, which is designed here as a helical compression spring 31 surrounding the magnet armature 17 coaxially. The annular disc 29 has a recess 33 which forms a support and centering surface for the helical compression spring 31. The other side of the helical compression spring 31 is supported on the housing 10 via a damping element 34, here a damping rubber acting as an end stop. The spring characteristic of the helical compression spring 31 is designed progressively. Depending on the needs at hand, the spring characteristic can be either steep or flat and / or strong or weakly progressive. With a steep spring characteristic, the installation space required for accommodating the helical compression spring 31 is small, but the contact pressure to be applied is still relatively high in order to prevent the electric tacker from jumping. In the second case, the additional construction volume for accommodating the helical compression spring 31 is considerably larger, but here one has the advantage of a very low recoil.

Die Wirkungsweise des vorstehend beschriebenen Elektrotackers ist wie folgt:

  • Der Elektrotacker wird zunächst mit der Öffnung des Ausstosskanals 11 auf das Werkstück aufgesetzt und an das Werkstück angedrückt. Wie in der DE-OS 3 232 137 beschrieben, wird durch diese Bewegung die vorderste einer Reihe von im Magazin 12 gespeicherten Befestigungsklammern in den Ausstosskanal 11 gebracht. Durch manuelles Betätigen eines nicht dargestellten Einschalters für den Elektromagneten 14 wird die Erregerwicklung 22 mit Erregerstrom beaufschlagt. Der Magnetanker 16 wird in die Zentralöffnung 18 hineingezogen, wobei das Stossmesser 13 die im Ausstosskanal 11 befindliche Befestigungsklammer in das Werkstück eintreibt. Der beim Beschleunigen des Magnetankers 17 auf die Erregerspule 16 ausgeübte Rückimpuls erteilt letzterer eine Rückgeschwindigkeit von ca. 1 m/s. Dadurch hat die Erregerspule 16 zum Zeitpunkt, an dem die Befestigungsklammer gerade in das Werkstück eingedrungen ist, einen Weg von ca. 10 mm zurückgelegt. Durch die Progression der Federkennlinie übt die Schraubendruckfeder 31 auf den ersten Millimetern ihres Zusammendrückens nur eine geringe Kraft auf die Erregerspule 16 aus, die von dem Bedienenden spielend aufgebracht werden kann. Der Elektrotacker bleibt damit in Kontakt mit dem Werkstück und die Befestigungsklammer wird stets bündig zur Werkstückoberfläche vollständig eingeschlagen. Der nach Beendigung dieses Eintreibvorgangs der Befestigungsklammer sich anschliessende Bewegungsvorgang der Erregerspule 16 wird bestimmt von der Art der Progression der Federkennlinie. Eine flache, schwach progressive Federkennlinie bewirkt nur einen sehr geringen Rückstoss auf das Gehäuse 10, während eine etwas steilere und eventuell auch stärker progressive Federkennlinie eine grössere Anpresskraft zum Auffangen des Rückstosses erforderlich macht.
The operation of the electric tacker described above is as follows:
  • The electric stapler is first placed on the workpiece with the opening of the ejection channel 11 and pressed onto the workpiece. As described in DE-OS 3 232 137, this movement brings the foremost of a series of fastening clips stored in the magazine 12 into the ejection channel 11. By manual actuation of a switch, not shown, for the electromagnet 14, the excitation winding 22 is supplied with excitation current. The magnet armature 16 is drawn into the central opening 18, the butt knife 13 driving the fastening clip located in the ejection channel 11 into the workpiece. The return pulse exerted on the excitation coil 16 when the magnet armature 17 accelerates gives the latter a return speed of approximately 1 m / s. As a result, the excitation coil 16 has traveled a distance of approximately 10 mm at the point in time at which the fastening clip has just penetrated the workpiece. Due to the progression of the spring characteristic, the helical compression spring 31 exerts only a small force on the excitation coil 16 over the first millimeters of its compression, which can be easily applied by the operator. The electric stapler remains in contact with the workpiece and the mounting bracket is always hammered in flush with the workpiece surface. The movement process of the excitation coil 16 that follows after this driving-in process of the fastening clip is determined by the type of progression of the spring characteristic. A flat, weakly progressive spring characteristic causes only a very small recoil on the housing 10, while a somewhat steeper and possibly also more progressive spring characteristic requires a greater contact force to absorb the recoil.

Claims (10)

1. Hammering device for fixing means such as staples, nails and the like, particularly electrical tack- ers, comprising an impact tool (13), carried in a housing (10), for hammering in the fixing means, and an electromagnet (14) which is arranged in the housing (10) and drives the impact tool (13) and which has an exciter coil (16) and a magnetic armature (17) which is carried in the central opening (18) of the coil and to which the impact tool (13) is attached, characterized in that the exciter coil (16) is axially movable carried in the housing (10) and is supported at the housing (10) via a restoring spring (30).
2. Device according to Claim 1, characterized in that the restoring spring (30) has a progressive spring characteristic.
3. Device according to Claim 1 or 2, characterized in that the restoring spring (30) is constructed as compression spring, preferably as a helical compression spring (31) which coaxially surrounds the magnetic armature (17) and which is supported, on the one hand against the front of the exciter coil (16) and, on the other hand, against the housing (10).
4. Device according to Claim 3, characterized in that a damping element (34) acting as end stop is arranged between the compression spring (31) and the housing (10).
5. Device according to one of Claims 1 to 4, characterized in that an additional mass (29) is attached to the exciter coil (16).
6. Device according to one of Claims 1 to 5, characterized in thatthe exciter coil (16) is mounted in an approximately pot-shaped guide sleeve (23) having a coaxial cylindrical connector (24) and that the guide sleeve (23) is longitudinally displaceably held in the housing (10).
7. Device according to Claim 6, characterized in that, in the unexcited basic position of exciter coil (16) and magnetic armature (17), the bottom (25) of the guide sleeve (23) rests against an annular ridge (27) radially projecting from the housing (10), via at least one elastic stop element (26).
8. Device according to Claim 6 or 7, characterized in that the exciter coil (16) has a coil former (19) which is approximately like a reel of thread and which projects with a cylindrical extension (20) into the cylindrical connector (24) of the guide sleeve (23) and is attached, preferably together with the stop element (26), to the bottom (25) of the guide sleeve (23).
9. Device according to one of Claims 6 to 8, characterized in that the additional mass is constructed as annular disc (29) which rests against the open side of the pot-shaped guide sleeve (23) against its front edge (32) and that the compression spring (31) is supported against the annular disc (29).
10. Device according to Claim 9, characterized in that the annular disc (29) hs a recess (33) which forms a resting and centering area for the compression spring (31).
EP84116358A 1984-02-18 1984-12-27 Fastener driving tool, especially electro-tacker Expired EP0152628B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3405906 1984-02-18
DE19843405906 DE3405906A1 (en) 1984-02-18 1984-02-18 DRIVING DEVICE FOR FASTENING AGENTS, ESPECIALLY ELECTROTACKER

Publications (2)

Publication Number Publication Date
EP0152628A1 EP0152628A1 (en) 1985-08-28
EP0152628B1 true EP0152628B1 (en) 1987-07-15

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EP84116358A Expired EP0152628B1 (en) 1984-02-18 1984-12-27 Fastener driving tool, especially electro-tacker

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EP (1) EP0152628B1 (en)
DE (2) DE3405906A1 (en)

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Also Published As

Publication number Publication date
US4565313A (en) 1986-01-21
DE3464713D1 (en) 1987-08-20
EP0152628A1 (en) 1985-08-28
DE3405906A1 (en) 1985-08-22

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