EP0403796B1 - Electric driving tool - Google Patents

Electric driving tool Download PDF

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Publication number
EP0403796B1
EP0403796B1 EP90109201A EP90109201A EP0403796B1 EP 0403796 B1 EP0403796 B1 EP 0403796B1 EP 90109201 A EP90109201 A EP 90109201A EP 90109201 A EP90109201 A EP 90109201A EP 0403796 B1 EP0403796 B1 EP 0403796B1
Authority
EP
European Patent Office
Prior art keywords
switch
driving
circuit
nose
operated
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
Application number
EP90109201A
Other languages
German (de)
French (fr)
Other versions
EP0403796A1 (en
Inventor
Manfred Dipl.-Ing. Buck
Karl Dr.-Ing. Wanner
Wolfgang Dipl.-Ing. Schmid
Peter Dipl.-Ing. Jordan
Wilfried Dipl.-Ing. Kabatnik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OFFERTA DI LICENZA AL PUBBLICO;AL PUBBLICO
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0403796A1 publication Critical patent/EP0403796A1/en
Application granted granted Critical
Publication of EP0403796B1 publication Critical patent/EP0403796B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/064—Circuit arrangements for actuating electromagnets
    • 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 is based on a driving tool according to the preamble of claim 1.
  • a driving tool is already known, in which a blow is triggered by a switch when it is simultaneously operated by a lever and a switch lever in the handle and by mechanical levers the movable magazine is activated. Because of the strong return stroke forces in the driving tools, if the driving tool is weakly pressed against the workpiece during the driving process, the magazine nose can be lifted off the workpiece and the current flow through the magnetic coil can be interrupted. This can lead to premature erosion of the switching contacts and possibly even welding of the contacts and the need for additional interference suppression measures.
  • the driving tool according to the invention with the characterizing features of claim 1 has the advantage that the driving process is no longer influenced by the state of the switch actuated by the magazine as soon as the driver blow has been triggered.
  • the Current cannot flow through the solenoid by the switch. This also increases the service life of the switch and the entire driving tool.
  • Figure 1 shows a longitudinal section through a driving tool and Figure 2 shows a simplified control circuit.
  • the individual parts of the driving tool 10 according to the invention correspond, insofar as they match, to those from DE 35 43 373 A1.
  • the housing 11 of the driving tool 10 has a handle 12.
  • a switch 13 is located therein, which is located in the power supply circuit of a magnetic coil 15 and can be operated manually with a pushbutton 16.
  • a plunger magnet 19 acting on a driver 18 is arranged within the magnet coil 15.
  • the driver 18 is longitudinally displaceable within an ejection channel 20 in the head 21 of a staple magazine 22.
  • a nose 23 on the head 21 projects beyond the underside of the magazine 22.
  • the magazine 22 is movably supported relative to the housing 11 with the interposition of a spring 24. It acts as a switch button 25 via a lever 26 on a trigger switch 27.
  • the lug 23 it is also possible for the lug 23 to be designed as a feeler pin movable in the direction of the discharge channel 20 and to serve as a switching element, the magazine 22 being firmly connected to the housing 11.
  • the nose 23 can of course also act directly on the switch 27 without lever transmission.
  • the trigger switch 27 is located electrically in an ignition circuit 30 of a control circuit 31 shown in simplified form in FIG. 2, which is connected to an AC voltage (mains voltage 220V) and regulates the power supply to the magnetic coil 15.
  • the ignition circuit there is also an impact strength regulator 32, a trigger circuit 33, a pulse shaper 34 and a thyristor 35.
  • voltage is applied to the trigger circuit 33 and it gives a pulse corresponding to the position of the impact strength potentiometer 32 to the pulse shaper 34.
  • the transformed pulse is passed on to the thyristor 35, so that it becomes conductive and closes the load circuit 36 for supplying power to the magnetic coil 15.
  • the solenoid is live for up to 10 milliseconds.
  • the thyristor 35 is not conductive and the load circuit 36 is de-energized again.
  • a renewed ignition of the thyristor can only take place after opening at least one of the two switches 13 or 27 by subsequently switching both switches back into the closed state at the same time.
  • one of the switches 13, 27 can be operated continuously and only the other trigger the switching pulse.
  • a very short voltage pulse is sufficient to activate the ignition circuit 30. Opening or closing the switch 27 e.g. when the switch button 25 bounces, the power supply to the magnetic coil 15 does not affect the load circuit closed by the switch 13, since the switch 27 only acts on the trigger circuit 33 which is insensitive in this respect.
  • the mechanical sequence of a driver blow occurs in a known manner in such a way that the plunger magnet 19 is attracted by the magnet coil 15 and accelerated in the direction of the magazine nose 23.
  • the immersion magnet 19 takes the driver 18 with it, which shears off a fastening means in the magazine 22 and drives it out through the ejection channel 20.

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

Description

Die Erfindung geht aus von einem Eintreibgerät nach der Gattung des Anspruchs 1. Aus der DE 35 43 373 A1 ist bereits ein solches Eintreibgerät bekannt, bei dem ein Schlag über einen Schalter ausgelöst wird, wenn dieser über mechanische Hebel gleichzeitig von einem Schaltdrücker im Handgriff und dem beweglichen Magazin aktiviert wird. Wegen den bei Eintreibgeräten starken Rückhubkräften kann es bei schwachem Andruck des Eintreibgerätes an das Werkstück während des Eintreibvorganges zu einem Abheben der Magazinnase vom Werkstück und damit zu einer Unterbrechung des Stromflußes durch die Magnetspule kommen. Dies kann zu einem vorzeitigen Abbrand der Schaltkontakte und möglicherweise sogar zum Verschweißen der Kontakte sowie zur Notwendigkeit zusätzlicher Entstörmaßnahmen führen.The invention is based on a driving tool according to the preamble of claim 1. From DE 35 43 373 A1, such a driving tool is already known, in which a blow is triggered by a switch when it is simultaneously operated by a lever and a switch lever in the handle and by mechanical levers the movable magazine is activated. Because of the strong return stroke forces in the driving tools, if the driving tool is weakly pressed against the workpiece during the driving process, the magazine nose can be lifted off the workpiece and the current flow through the magnetic coil can be interrupted. This can lead to premature erosion of the switching contacts and possibly even welding of the contacts and the need for additional interference suppression measures.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Eintreibgerät mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß der Eintreibvorgang vom Zustand des vom Magazin betätigten Schalters nicht mehr beeinflußt wird, sobald der Treiberschlag einmal ausgelöst wurde. Der Stromfluß durch die Magnetspule kann von den Schalter nicht unterbrochen werden. Dadurch wird auch die Lebensdauer des Schalters und des ganzen Eintreibgerätes erhöht.The driving tool according to the invention with the characterizing features of claim 1 has the advantage that the driving process is no longer influenced by the state of the switch actuated by the magazine as soon as the driver blow has been triggered. The Current cannot flow through the solenoid by the switch. This also increases the service life of the switch and the entire driving tool.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Beschreibung näher erläutert. Figur 1 zeigt einen Längsschnitt durch ein Eintreibgerät und Figur 2 eine vereinfachte Steuerschaltung.An embodiment of the invention is shown in the drawing and explained in more detail in the description. Figure 1 shows a longitudinal section through a driving tool and Figure 2 shows a simplified control circuit.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einzelteile des erfindungsgemäßen Eintreibgerätes 10 entsprechen, soweit sie übereinstimmen, denen aus der DE 35 43 373 A1. Das Gehäuse 11 des Eintreibgerätes 10 weist einen Handgriff 12 auf. Darin befindet sich ein Schalter 13, der im Stromversorgungskreis einer Magnetspule 15 liegt und mit einer Drucktaste 16 manuell bedienbar ist.The individual parts of the driving tool 10 according to the invention correspond, insofar as they match, to those from DE 35 43 373 A1. The housing 11 of the driving tool 10 has a handle 12. A switch 13 is located therein, which is located in the power supply circuit of a magnetic coil 15 and can be operated manually with a pushbutton 16.

Ein auf einen Treiber 18 wirkender Tauchmagnet 19 ist innerhalb der Magnetspule 15 angeordnet. Der Treiber 18 ist innerhalb eines Ausstoßkanals 20 im Kopf 21 eines Heftmittelmagazins 22 längsverschiebbar. Eine Nase 23 am Kopf 21 überragt die Unterseite des Magazins 22. Das Magazin 22 ist gegenüber dem Gehäuse 11 unter Zwischenlage einer Feder 24 beweglich gelagert. Es wirkt als Schalttaste 25 über einen Hebel 26 auf einen Auslöseschalter 27 ein. Es kann aber auch lediglich die Nase 23 als Fühlerstift beweglich in Richtung des Ausstoßkanals 20 ausgebildet sein und als Schaltglied dienen, wobei das Magazin 22 fest mit dem Gehäuse 11 verbunden ist. Die Nase 23 kann selbstverständlich auch ohne Hebelübersetzung direkt auf den Schalter 27 einwirken.A plunger magnet 19 acting on a driver 18 is arranged within the magnet coil 15. The driver 18 is longitudinally displaceable within an ejection channel 20 in the head 21 of a staple magazine 22. A nose 23 on the head 21 projects beyond the underside of the magazine 22. The magazine 22 is movably supported relative to the housing 11 with the interposition of a spring 24. It acts as a switch button 25 via a lever 26 on a trigger switch 27. However, it is also possible for the lug 23 to be designed as a feeler pin movable in the direction of the discharge channel 20 and to serve as a switching element, the magazine 22 being firmly connected to the housing 11. The nose 23 can of course also act directly on the switch 27 without lever transmission.

Der Auslöseschalter 27 liegt elektrisch in einem Zündkreis 30 einer in Figur 2 vereinfacht dargestellten Steuerschaltung 31, die an einer Wechselspannung (Netzspannung 220V) anliegt und die Stromversorgung der Magnetspule 15 regelt. In dem Zündkreis liegt weiter ein Schlagstärkeregler 32, eine Triggerschaltung 33, ein Impulsformer 34 und ein Thyristor 35. Sobald die beiden Schalter 13 und 27 gleichzeitig geschlossen sind, liegt an der Triggerschaltung 33 Spannung an und sie gibt entsprechend der Stellung des Schlagstärkepotentiometers 32 einen Impuls an den Impulsformer 34 ab. Der umgeformte Impuls wird an den Thyristor 35 weitergegeben, sodaß dieser leitend wird und den Lastkreis 36 zur Stromversorgung der Magnetspule 15 schließt. Während eines Treiberschlages liegt die Magnetspule bis zu 10 Millisekunden lang an Spannung. Nach erfolgtem Treiberschlag wird der Thyristor 35 nicht leitend und der Lastkreis 36 ist wieder stromlos. Eine erneute Zündung des Thyristors kann erst nach Öffnen mindestens einer der beiden Schalter 13 oder 27 erfolgen, indem anschließend wieder beide Schalter in gleichzeitig geschlossenen Zustand überführt werden. Hierbei kann einer der Schalter 13, 27 dauernd betätigt sein und nur der andere den Schaltimpuls auslösen.The trigger switch 27 is located electrically in an ignition circuit 30 of a control circuit 31 shown in simplified form in FIG. 2, which is connected to an AC voltage (mains voltage 220V) and regulates the power supply to the magnetic coil 15. In the ignition circuit there is also an impact strength regulator 32, a trigger circuit 33, a pulse shaper 34 and a thyristor 35. As soon as the two switches 13 and 27 are closed at the same time, voltage is applied to the trigger circuit 33 and it gives a pulse corresponding to the position of the impact strength potentiometer 32 to the pulse shaper 34. The transformed pulse is passed on to the thyristor 35, so that it becomes conductive and closes the load circuit 36 for supplying power to the magnetic coil 15. During a driver blow, the solenoid is live for up to 10 milliseconds. After the driver blow, the thyristor 35 is not conductive and the load circuit 36 is de-energized again. A renewed ignition of the thyristor can only take place after opening at least one of the two switches 13 or 27 by subsequently switching both switches back into the closed state at the same time. Here, one of the switches 13, 27 can be operated continuously and only the other trigger the switching pulse.

Zur Aktivierung des Zündkreises 30 reicht bereits ein sehr kurzer Spannungsimpuls. Ein Öffnen oder mehrmaliges Schließen des Schalters 27 z.B. bei Prellen der Schalttaste 25 beeinflußt bei durch den Schalter 13 geschlossenem Lastkreis die Stromversorgung der Magnetspule 15 nicht, da der Schalter 27 nur auf die in dieser Hinsicht unempfindliche Triggerschaltung 33 einwirkt.A very short voltage pulse is sufficient to activate the ignition circuit 30. Opening or closing the switch 27 e.g. when the switch button 25 bounces, the power supply to the magnetic coil 15 does not affect the load circuit closed by the switch 13, since the switch 27 only acts on the trigger circuit 33 which is insensitive in this respect.

Der mechanische Ablauf eines Treiberschlages erfolgt in bekannter Weise derart, daß der Tauchmagnet 19 von der Magnetspule 15 angezogen und in Richtung Magazinnase 23 beschleunigt wird. Dabei nimmt der Tauchmagnet 19 den Treiber 18 mit, der ein Befestigungsmittel im Magazin 22 abschert und durch den Ausstoßkanal 20 austreibt.The mechanical sequence of a driver blow occurs in a known manner in such a way that the plunger magnet 19 is attracted by the magnet coil 15 and accelerated in the direction of the magazine nose 23. The immersion magnet 19 takes the driver 18 with it, which shears off a fastening means in the magazine 22 and drives it out through the ejection channel 20.

Claims (6)

  1. Electric driving-in device (10) for striking in fastening means, having a driver (18) which is driven by a magnetic coil (15) and drives fastening means, arranged in series in a magazine (22) mounted in the housing (11) of the driving-in device, out through a discharge channel (20), at the end of which a movable nose (23) is located, and having a manually operable push-button (16) and a switching button (25), which can be operated by a movement of the nose directed against the housing and the simultaneous operation of which influences an electric switch for triggering a strike by the driver, characterised in that both the manually operable push-button (16) and the switching button (25) operated by the nose (23) in each case act on an electric switch of their own (13, 27) and both switches (13, 27) are incorporated in a control circuit (31) for the magnetic coil (15), which control circuit (31) has two switching circuits, a load circuit (36) and a firing circuit (30), the switch (13) operated by the push-button (16) being arranged in the load circuit (36) and the triggering switch (27) operated by the magazine nose (23) being arranged in the firing circuit (30) of the control circuit (31), and the load circuit (36) being connected by an electronic switch (35) to the firing circuit (30) in such a way that, in the closed state, it is not influenced by an opening of the firing circuit (30).
  2. Driving-in device according to Claim 1, characterised in that the nose (23) forms the end of the discharge channel (20) and is connected solidly to the magazine (22), which is mounted on the housing 11 movably about an axis.
  3. Driving-in device according to Claim 1, characterised in that the nose (23) is formed by a sensor pin, displaceable in the direction of the discharge channel (20).
  4. Driving-in device according to Claim 1, characterised in that a strike by the driver is triggered by simultaneous operating of the switch (13) and the triggering switch (27), a brief closing of the triggering switch (27) in comparison with the duration of a driving-in strike already activating the control circuit (31).
  5. Driving-in device according to one of the preceding claims, characterised in that a strike by the driver can be triggered upon operating the second of the two switches (13, 27), irrespective of whether the switch (13) is operated first or the triggering switch (27) is operated first.
  6. Driving-in device according to one of the preceding claims, characterised in that the firing circuit (30) has a trigger circuit (33), which controls a thyristor (35) in the load circuit (36) of the control circuit (31).
EP90109201A 1989-06-20 1990-05-16 Electric driving tool Expired - Lifetime EP0403796B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920063A DE3920063A1 (en) 1989-06-20 1989-06-20 ELECTRIC DRIVER
DE3920063 1989-06-20

Publications (2)

Publication Number Publication Date
EP0403796A1 EP0403796A1 (en) 1990-12-27
EP0403796B1 true EP0403796B1 (en) 1993-09-08

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EP90109201A Expired - Lifetime EP0403796B1 (en) 1989-06-20 1990-05-16 Electric driving tool

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DE (2) DE3920063A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010030077A1 (en) 2010-06-15 2011-12-15 Hilti Aktiengesellschaft driving-
DE102010030097A1 (en) * 2010-06-15 2011-12-15 Hilti Aktiengesellschaft driving-

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE626352A (en) * 1961-12-22
US3786978A (en) * 1972-06-05 1974-01-22 Electro Matic Staplers Inc Electromagnetic stapler

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Publication number Publication date
DE3920063A1 (en) 1991-01-03
EP0403796A1 (en) 1990-12-27
DE59002615D1 (en) 1993-10-14

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