EP0104360B1 - Electromagnetic driving tool - Google Patents

Electromagnetic driving tool Download PDF

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Publication number
EP0104360B1
EP0104360B1 EP83107492A EP83107492A EP0104360B1 EP 0104360 B1 EP0104360 B1 EP 0104360B1 EP 83107492 A EP83107492 A EP 83107492A EP 83107492 A EP83107492 A EP 83107492A EP 0104360 B1 EP0104360 B1 EP 0104360B1
Authority
EP
European Patent Office
Prior art keywords
hollow cylinder
ram
driver according
return
valve flap
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
Application number
EP83107492A
Other languages
German (de)
French (fr)
Other versions
EP0104360A2 (en
EP0104360A3 (en
Inventor
Fritz Dipl.-Ing. Schädlich
Werner Dipl.-Ing. Rieker
Rainer Thaler
Klaus Klingenstein
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.)
Robert Bosch GmbH
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 EP0104360A2 publication Critical patent/EP0104360A2/en
Publication of EP0104360A3 publication Critical patent/EP0104360A3/en
Application granted granted Critical
Publication of EP0104360B1 publication Critical patent/EP0104360B1/en
Expired legal-status Critical Current

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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
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

  • the invention is based on a wrapping device according to the preamble of the main claim.
  • a wrapping device is already known from FR-A-2 405 119.
  • a disadvantage of this is the complicated valve structure, in which several parts that move against one another are required to ensure sufficient ventilation of a ram guide cylinder during the wrapping process.
  • Another disadvantage is the chosen seal with an additional, flexible sleeve against the inner wall of this large diameter guide cylinder. Friction is generated there, which must be paid for with increased wear on the cuff. This flexible sleeve cannot provide perfect guidance for the tappet either.
  • the air damping does not cause a progressive damping, as is aimed for a smooth arrival of the ram in the starting position.
  • the elastic sleeve also does not define a clear, repetitive starting position for the ram. This causes variations in the impact strength, which are also undesirable.
  • Another disadvantage of the known construction is the large overall height that is necessary to ensure a somewhat tilt-free guidance of the plunger and the sleeve in the guide cylinder with the large inner diameter.
  • the number of individual parts required is relatively high and their design is complex for production.
  • the wrapping device according to the invention with the characterizing features of the main claim has the advantage that its air damper is simply the same in construction and in service life as the other components of the device. In addition, less space is required for this air damper.
  • the selected combination of the tappet guide for the air damper and the check valve ensures ideal use of space and parts. An ideal damping characteristic with a damper effect that increases towards the end of the return stroke movement proves to be particularly advantageous.
  • a coil 2 is arranged through the cylindrical interior 3 of which a cup-shaped plunger 4 and a pusher knife 5 fixedly connected thereto are displaceably guided.
  • the plunger 4 is additionally axially displaceable on a hollow cylinder 6.
  • the widened foot 7 of the hollow cylinder 6 is firmly connected to the device housing 1.
  • An opening 8 in the device housing 1 connects the interior of the hollow cylinder 6 with the outside air.
  • a valve flap 9 is fastened to the inside of the hollow cylinder 6 in such a way that it allows air flowing in from the outside to pass through unhindered, but prevents air from escaping from the housing.
  • the space around the plunger 4 is also vented to the outside, which is shown by an opening 10 in the device housing 1.
  • a conical coil spring 11 is supported against a spring ring 12 at the end of the plunger 4 and against a disk 13 which has been pushed onto the plunger 4 in front of it.
  • the abutment for this helical spring 11 is formed by a rib 14 of the device housing 1.
  • the lower end of the butt knife 5 in the drawing is guided in a guide channel 15.
  • a magazine guide 16 for a fastener magazine 17 leads at right angles to the guide channel 15.
  • a fastening means is introduced into the guide channel 15 in front of the butt knife 5.
  • the air in the interior of the plunger 4 is slowly pressed through a throttle gap 19 formed between the plunger 4 and the hollow cylinder 6, because the valve flap 9 now closing the interior of the hollow cylinder 6 does not allow the air to escape unimpeded to the outside.
  • the return stroke movement in the direction of an arrow 20 is damped and prevents the plunger 4 from bouncing back from its contact surface on the base 7 of the hollow cylinder 6. This ensures that the wrapping device functions properly.

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

Description

Die Erfindung geht aus von einem Einschlaggerät nach der Gattung des Hauptanspruchs. Es ist schon ein solches Einschlaggerät bekannt durch die FR-A-2 405 119. Nachteilig ist daran, der komplizierte Ventilaufbau, bei dem mehrere gegeneinander bewegliche Teile benötigt werden, um eine genügende Belüftung eines Stösselführungszylinders während des Einschlagvorgangs zu gewährleisten. Weiter ist nachteilig, die gewählte Abdichtung mit einer zusätzlichen, flexiblen Manschette gegen die Innenwand dieses Führungszylinders mit grossem Durchmesser. Dort wird Reibung erzeugt, die mit erhöhtem Verschleiss der Manschette bezahlt werden muss. Eine einwandfreie Führung für den Stössel kann diese flexible Manschette auch nicht geben. Schliesslich bewirkt die Luftdämpfung durch die im Durchmesser konstant bleibende Entlüftungsöffnung im Boden des Führungszylinders nicht eine progressive Dämpfung wie sie für ein schlagfreies Ankommen des Stössels in der Ausgangsstellung angestrebt wird. Die elastische Manschette definiert auch keine eindeutige, sich stets wiederholende Ausgangslage für den Stössel. Das bewirkt Streuungen der Schlagstärke, die ebenfalls nicht erwünscht sind. Als weiterer Nachteil der bekannten Konstruktion ist die grosse Bauhöhe anzusehen, die nötig wird, um eine einigermassen kippfreie Führung des Stössels und der Manschette im Führungszylinder mit dem grossen Innendurchmesser zu gewährleisten. Schlussendlich ist die Anzahl der benötigten Einzelteile relativ hoch und deren Gestaltung für die Fertigung aufwendig.The invention is based on a wrapping device according to the preamble of the main claim. Such a wrapping device is already known from FR-A-2 405 119. A disadvantage of this is the complicated valve structure, in which several parts that move against one another are required to ensure sufficient ventilation of a ram guide cylinder during the wrapping process. Another disadvantage is the chosen seal with an additional, flexible sleeve against the inner wall of this large diameter guide cylinder. Friction is generated there, which must be paid for with increased wear on the cuff. This flexible sleeve cannot provide perfect guidance for the tappet either. Finally, due to the vent opening in the bottom of the guide cylinder, which has a constant diameter, the air damping does not cause a progressive damping, as is aimed for a smooth arrival of the ram in the starting position. The elastic sleeve also does not define a clear, repetitive starting position for the ram. This causes variations in the impact strength, which are also undesirable. Another disadvantage of the known construction is the large overall height that is necessary to ensure a somewhat tilt-free guidance of the plunger and the sleeve in the guide cylinder with the large inner diameter. Finally, the number of individual parts required is relatively high and their design is complex for production.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemässe Einschlaggerät mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass sein Luftdämpfer einfach im Aufbau und in der Lebensdauer den übrigen Bauteilen des Gerätes gleich ist. Ausserdem wird für diesen Luftdämpfer weniger Raum benötigt. Durch die gewählte Kombination der Stösselführung des Luftdämpfers und des Rückschlagventils wird eine ideale Raum- und Teilenutzung erreicht. Dabei zeigt sich als besonders vorteilhaft eine ideale Dämpfungscharakteristik mit gegen das Ende der Rückhubbewegung wachsender Dämpferwirkung.In contrast, the wrapping device according to the invention with the characterizing features of the main claim has the advantage that its air damper is simply the same in construction and in service life as the other components of the device. In addition, less space is required for this air damper. The selected combination of the tappet guide for the air damper and the check valve ensures ideal use of space and parts. An ideal damping characteristic with a damper effect that increases towards the end of the return stroke movement proves to be particularly advantageous.

Durch die in den Unteransprüchen aufgeführten Massnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Einschlaggerätes möglich. Besonders günstig ist die Ausbildung des Luftdämpfers mit einem ringförmigen Drosselspalt zwischen dem Stössel und dem diesen führenden Hohlzylinder, der sich gegen die Ruhelage hin verengt.The measures listed in the subclaims permit advantageous developments and improvements of the wrapping device specified in the main claim. It is particularly favorable to design the air damper with an annular throttle gap between the tappet and the hollow cylinder guiding it, which narrows towards the rest position.

Zeichnungdrawing

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt einen Längsschnitt durch ein erfindungsgemässes Einschlaggerät. Beschreibung des AusführungsbeispielsAn embodiment of the subject of the invention is shown in the drawing and explained in more detail in the following description. The figure shows a longitudinal section through an impact device according to the invention. Description of the embodiment

In einem Gerätegehäuse 1 eines Einschlaggerätes ist eine Spule 2 angeordnet durch deren zylindrischen Innenraum 3 ein topfförmiger Stössel 4 und ein mit diesem fest verbundenes Stossmesser 5 verschiebbar geführt ist. Der Stössel 4 lagert zusätzlich axial verschiebbar auf einem Hohlzylinder 6. Der verbreiterte Fuss 7 des Hohlzylinders 6 ist festverbunden mitdem Gerätegehäuse 1. Eine Öffnung 8 im Gerätegehäuse 1 verbindet den Innenraum des Hohlzylinders 6 mit der Aussenluft. Am gehäuseinneren Ende des Hohlzylinders 6 ist eine Ventilklappe 9 so befestigt, dass sie von aussen einströmende Luft ungehindert durchlässt, den Luftaustritt aus dem Gehäuse aber verhindert. Der Raum um den Stössel 4 herum ist ebenfalls nach aussen hin entlüftet, was durch eine Öffnung 10 im Gerätegehäuse 1 dargestellt ist. Eine konische Schraubenfeder 11 stützt sich gegen einen Federring 12 am Ende des Stössels 4 und eine davor auf den Stössel 4 aufgeschobene Scheibe 13 ab. Das Widerlager für diese Schraubenfeder 11 wird durch eine Rippe 14 des Gerätegehäuses 1 gebildet. Das in der Zeichnung untere Ende des Stossmessers 5 ist in einem Führungskanal 15 geführt. Eine Magazinführung 16 für ein Befestigungsmittelmagazin 17 führt rechtwinklig zum Führungskanal 15 hin. So ist in an sich bekannter Weise jeweils ein Befestigungsmittel vor das Stossmesser 5 in den Führungskanal 15 eingebracht.In a device housing 1 of a wrapping device, a coil 2 is arranged through the cylindrical interior 3 of which a cup-shaped plunger 4 and a pusher knife 5 fixedly connected thereto are displaceably guided. The plunger 4 is additionally axially displaceable on a hollow cylinder 6. The widened foot 7 of the hollow cylinder 6 is firmly connected to the device housing 1. An opening 8 in the device housing 1 connects the interior of the hollow cylinder 6 with the outside air. A valve flap 9 is fastened to the inside of the hollow cylinder 6 in such a way that it allows air flowing in from the outside to pass through unhindered, but prevents air from escaping from the housing. The space around the plunger 4 is also vented to the outside, which is shown by an opening 10 in the device housing 1. A conical coil spring 11 is supported against a spring ring 12 at the end of the plunger 4 and against a disk 13 which has been pushed onto the plunger 4 in front of it. The abutment for this helical spring 11 is formed by a rib 14 of the device housing 1. The lower end of the butt knife 5 in the drawing is guided in a guide channel 15. A magazine guide 16 for a fastener magazine 17 leads at right angles to the guide channel 15. In a manner known per se, a fastening means is introduced into the guide channel 15 in front of the butt knife 5.

Beim Anlegen eines Spannungsimpulses an die Spule 2 wird durch das entstehende Magnetfeld der Stössel 4 schnell in den Innenraum 3 der Spule hineingezogen (Pfeil 18). Dabei wird das Stossmesser 5 durch den Führungskanal 15 bewegt, löst ein Befestigungsmittel vom Befestigungsmittelmagazin 17 und treibt dieses in ein vor dem Ende des Führungskanals 15 liegendes Werkstück ein. Bei dieser Bewegung hat der Stössel 4 durch die Öffnung 8 und den Innenraum des Hohlzylinders 6 Aussenluft angesaugt, wobei die Ventilklappe 9 diese Aussenluft ungehindert eintreten liess. Die Einschlagbewegung wurde also durch den aus dem Stössel 4 und dem Hohlzylinder 6 gebildeten Luftdämpfer nicht behindert. Das am Ende des Spannungsimpulses zusammenbrechende Magnetfeld gibt den Stössel 4 wieder frei, so dass dieser unter der Wirkung der Schraubenfeder 11 in seine Ausgangsstellung zurückbewegt werden kann. Dabei wird die im Innenraum des Stössels 4 befindliche Luft langsam durch einen zwischen dem Stössel 4 und dem Hohlzylinder 6 gebildeten Drosselspalt 19 gepresst, weil die nun den Innenraum des Hohlzylinders 6 verschliessende Ventilklappe 9 ein unbehindertes Entweichen der Luft nach aussen nicht zulässt. Die Rückhubbewegung in Richtung eines Pfeiles 20 erfolgt gedämpft und verhindert ein Zurückprellen des Stössels 4 von seiner Anlagefläche am Fuss 7 des Hohlzylinders 6. Damit ist eine einwandfreie Funktion des Einschlaggerätes gewährleistet.When a voltage pulse is applied to the coil 2, the plunger 4 is quickly drawn into the interior 3 of the coil by the resulting magnetic field (arrow 18). The push knife 5 is moved through the guide channel 15, releases a fastener from the fastener magazine 17 and drives it into a workpiece lying in front of the end of the guide channel 15. During this movement, the tappet 4 has sucked in outside air through the opening 8 and the interior of the hollow cylinder 6, the valve flap 9 allowing this outside air to enter unhindered. The impact movement was therefore not hindered by the air damper formed from the plunger 4 and the hollow cylinder 6. The magnetic field which collapses at the end of the voltage pulse releases the plunger 4 again, so that it can be moved back into its starting position under the action of the helical spring 11. The air in the interior of the plunger 4 is slowly pressed through a throttle gap 19 formed between the plunger 4 and the hollow cylinder 6, because the valve flap 9 now closing the interior of the hollow cylinder 6 does not allow the air to escape unimpeded to the outside. The return stroke movement in the direction of an arrow 20 is damped and prevents the plunger 4 from bouncing back from its contact surface on the base 7 of the hollow cylinder 6. This ensures that the wrapping device functions properly.

Claims (7)

1. Electromagnetically operated driver with a return spring (11) for a ram (4) and a shock meter (5) connected to the latter, in which the ram (4) has assigned to it a pneumatic damper (4, 6, 19) influencing its return stroke and combined with a non-return valve (9), characterized in that the pneumatic damper (4, 6, 19) consists of the ram (4), a hollow cylinder (6) projecting into a cylindrical pot-shaped cavity of the ram (4), and a throttle gap (19) located between these, thus at the same time forming the ram guide.
2. Driver according to Claim 1, characterized in that the hollow cylinder (6) at one end (7) is fastened to the appliance housing (1) and communicates with the outside air via an appropriate orifice (8) in the appliance housing (1) and at the other end projects into the housing interior and there carries a non-return valve (9) opening during the driving movement of the ram (4) and closing during its return movement, and the throttle gap (19) located where the ram (4) is guided on the hollow cylinder (5) narrows preferably towards the position of rest of the ram (4).
3. Driver according to claim 1, characterized in that the throttle gap (19) is formed by play between the ram (4) and the hollow cylinder (6).
4. Driver according to one of claims 1 to 3, characterized in that the non-return valve on the hollow cylinder (6) of the pneumatic damper (4, 6, 19) is a valve flap (9) which closes off the orifice at the inner end of the hollow cylinder (6) from outside and which rests resiliently against this end.
5. Driver according to claim 4, characterized in that the valve flap (9) is produced from an elastomeric material and is connected to the hollow cylinder (6) by adhesive bonding, riveting or screwing.
6. Driver according to one of claims 1 to 5, characterized in that the hollow cylinder (6) is made of plastic.
7. Driver according to claim 6, characterized in that the valve flap (9) at the inner end of the hollow cylinder (6) is made in one piece with the hollow cylinder (6) as a bottom located at the inner end of the hollow cylinder (6) and connected to the latter on the one side only, the connecting web between the valve flap (9) and the hollow cylinder (6) acting as a film hinge.
EP83107492A 1982-08-28 1983-07-29 Electromagnetic driving tool Expired EP0104360B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823232120 DE3232120A1 (en) 1982-08-28 1982-08-28 ELECTROMAGNETICALLY OPERATED IMPACT DEVICE
DE3232120 1982-08-28

Publications (3)

Publication Number Publication Date
EP0104360A2 EP0104360A2 (en) 1984-04-04
EP0104360A3 EP0104360A3 (en) 1985-07-03
EP0104360B1 true EP0104360B1 (en) 1987-10-28

Family

ID=6171976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107492A Expired EP0104360B1 (en) 1982-08-28 1983-07-29 Electromagnetic driving tool

Country Status (5)

Country Link
US (1) US4515303A (en)
EP (1) EP0104360B1 (en)
JP (1) JPS5959361A (en)
BR (1) BR8304632A (en)
DE (2) DE3232120A1 (en)

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DE3405906A1 (en) * 1984-02-18 1985-08-22 Robert Bosch Gmbh, 7000 Stuttgart DRIVING DEVICE FOR FASTENING AGENTS, ESPECIALLY ELECTROTACKER
DE3437019C2 (en) * 1984-10-09 1994-01-20 Bosch Gmbh Robert Electromagnetically driven wrapping machine with an air damper
US4618087A (en) * 1985-06-12 1986-10-21 Lai Wen T High impact force stapling machine with rebounded impact force damping
US4940177A (en) * 1988-12-30 1990-07-10 Jimena Carlos L Electric stapler having electronic control circuit
GB2275227B (en) * 1993-02-23 1996-11-13 Tohoku Ricoh Co Limited Stencil duplication machine
DE19728176A1 (en) * 1997-07-02 1999-01-07 Hilti Ag High pressure gas operated fitting tool
CA2420365A1 (en) 2000-08-25 2002-02-28 Senco Products, Inc. Impact device
US6783051B2 (en) * 2002-01-15 2004-08-31 The Fletcher-Terry Company Point driver
US6742691B2 (en) * 2002-08-23 2004-06-01 Mu-Yu Chen Nail stapler
US20040159695A1 (en) * 2002-08-23 2004-08-19 Chu-Kuo Wang Nail stapler
US6662990B1 (en) * 2003-01-03 2003-12-16 Modern Pioneer Ltd. Buffer apparatus of electrical nailing gun
CN2644112Y (en) * 2003-07-04 2004-09-29 益卓有限公司 Electric nail fixer
US6857549B1 (en) * 2003-11-21 2005-02-22 Navtor Technology Corporation Nail driving gun with a shock-absorbing member
US7503400B2 (en) * 2004-01-30 2009-03-17 Arrow Fastener Co., Inc. Two shot power nailer
GB2411143B (en) * 2004-02-19 2005-12-28 Aplus Pneumatic Corp Nail stapler
DE102004008959A1 (en) * 2004-02-24 2005-09-08 Aplus Pneumatic Corp. Nail tacker for nails comprises a magazine containing nails and a nail driver for closing the nails from the magazine
US9071120B2 (en) * 2011-07-19 2015-06-30 Kanzaki Kokyukoki Mfg. Co., Ltd. Linear actuator and boring device
CN104955618B (en) 2013-03-29 2017-08-11 日立工机株式会社 Beating machine
US10195728B2 (en) 2013-07-31 2019-02-05 Koki Holdings Co., Ltd. Fastener driving tool
CN105082062B (en) * 2014-05-05 2017-10-10 北京大风时代科技有限责任公司 Electromagnetic nail gun
EP4281253A1 (en) 2021-01-20 2023-11-29 Milwaukee Electric Tool Corporation Powered fastener driver
US20230081812A1 (en) * 2021-09-15 2023-03-16 Robert Bosch Gmbh Head Valve System for Air Spring Power Tool

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US1853695A (en) * 1930-02-25 1932-04-12 Clarence M Griggs Pneumatic improvement for solenoid hammers
GB920586A (en) * 1960-09-21 1963-03-06 Bourcier Carbon Christian Improvements in or relating to pneumatic shock absorbers
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DE3047662C2 (en) * 1980-12-18 1985-02-21 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Buffer system for impact devices

Also Published As

Publication number Publication date
JPS5959361A (en) 1984-04-05
EP0104360A2 (en) 1984-04-04
BR8304632A (en) 1984-04-03
DE3232120A1 (en) 1984-03-01
DE3374184D1 (en) 1987-12-03
JPH0474149B2 (en) 1992-11-25
US4515303A (en) 1985-05-07
EP0104360A3 (en) 1985-07-03

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