EP0054782A2 - Buffer system in impact tools - Google Patents

Buffer system in impact tools Download PDF

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Publication number
EP0054782A2
EP0054782A2 EP81110132A EP81110132A EP0054782A2 EP 0054782 A2 EP0054782 A2 EP 0054782A2 EP 81110132 A EP81110132 A EP 81110132A EP 81110132 A EP81110132 A EP 81110132A EP 0054782 A2 EP0054782 A2 EP 0054782A2
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EP
European Patent Office
Prior art keywords
buffer
buffer element
buffer system
cylinder
percussion piston
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81110132A
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German (de)
French (fr)
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EP0054782A3 (en
EP0054782B1 (en
Inventor
Gerhard Farian
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Karl M Reich Maschinenfabrik GmbH
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Karl M Reich Maschinenfabrik GmbH
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Priority to AT81110132T priority Critical patent/ATE15777T1/en
Publication of EP0054782A2 publication Critical patent/EP0054782A2/en
Publication of EP0054782A3 publication Critical patent/EP0054782A3/en
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Publication of EP0054782B1 publication Critical patent/EP0054782B1/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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/047—Mechanical details

Definitions

  • the invention relates to a buffer system according to the preamble of claim 1.
  • an impact device for driving in nails or the like is known, the buffer system of which consists of a relatively soft buffer element made of volume-compressible material and a hard buffer element interacting therewith, the contact surface of which rests fully on the bottom of the cylinder base .
  • This buffer system is able to absorb surges with excess pressure and empty surges safely and with a long service life.
  • the contact between the hard buffer element and the bottom of the cylinder base creates an unpleasant structure-borne noise with each impact, which is annoying for the operator. In extreme cases there is also a considerable deformation of the hard buffer element, which can then be damaged by internal friction and heating.
  • the object of the present invention is therefore to create a buffer system of the type mentioned at the outset which reliably absorbs and destroys the excess of impact with the lowest possible structure-borne noise and with the longest possible service life.
  • the movable arrangement of the hard buffer element means the interposition of a friction stage between the soft spring characteristic of the soft buffer element and the hard spring characteristic of the hard buffer element.
  • the hard buffer element is arranged with a prestress in the cylinder, so that it is pressed even more against the outer ring by the soft buffer element when compressed. Upon further compression, the excess impact energy is then destroyed by friction on the contact surfaces between the hard buffer element and the cylinder base or inner wall of the cylinder, and the heat generated can be dissipated well.
  • the hard buffer element lies with its entire contact surface on the bottom of the cylinder base, then it acts as in the known design as a hard, deformable buffer, which is heated up considerably by internal friction. This internal heating can also lead to the destruction of the hard buffer element, but at the same time there is an increase in structure-borne noise, which shows the operator that the buffer element must be replaced. This reliably prevents damage or destruction of parts of the wrapping device.
  • the design of the buffer system according to the invention offers the further advantage that this compressed air is only slowly and therefore quieter from the cylinder during the return stroke of the percussion piston escapes
  • the soft buffer element rests on the hard buffer element and thus severely limits the cross section of the vent opening.
  • a cylinder 2 is arranged in a housing 1, in which a percussion piston 3 is displaceably mounted with a percussion plunger 4.
  • Compressed air is supplied to the impact device from a compressed air source (not shown) by a handle 5 and, after actuation of the trigger 6, reaches the interior of cylinder 2 by actuation of a tubular valve slide 7, where the compressed air pushes the percussion piston 3 held by an elastic latching device 8 in the direction of the cylinder base 9 accelerates.
  • the nail 10 is knocked into a workpiece, not shown, in a known manner by means of a ram 4. Additional nails 10 are provided in a magazine 11.
  • the cylinder 2 is surrounded by an air reservoir 12, into which compressed air passes through openings 13 and 14 in cylinder 2 in a known manner during the stroke stroke. After releasing trigger 6, this compressed air acts on the underside of percussion piston 3 and conveys it back to its starting position.
  • the impact piston 3 meets a buffer system 15, which is shown enlarged in FIG. 2. It consists of a first, hard-elastic buffer element 16, which expediently consists of cross-linked polyurethane. Its contact surface 18 directed against the conical bottom 17 of the cylinder base 9 is also frustoconical, but its cone angle is smaller than the cone angle of the bottom. When the buffer system is in a relaxed position, there is an intermediate space 19 between the base 17 and the contact surface 18, while the buffer element 16 lies against the base 20.
  • the buffer element 16 furthermore has a cylindrical section 21, the outer diameter of which is larger than the inner diameter of cylinder 2, so that the buffer element 16 is arranged in cylinder 2 with prestress.
  • the percussion piston 3 has a cylindrical recess 24, the inside diameter of which is somewhat larger than the outside diameter of the buffer element 22.
  • left half shows the buffer system 15 in a relaxed state, the percussion piston 3 just touching the second buffer element 22. There is a space 19 between the bottom 17 and the contact surface 18.
  • the buffer system 15 is now compressed to destroy the excess impact energy, as shown in FIG. 2, right half.
  • the first buffer element 16 is spread by the compressed second buffer element 22 so that its cylindrical section 21 presses against cylinder 2 beyond the preload.
  • the percussion piston 3 is further braked once the cylindrical section 21 moves against the cylinder 2 and parts of the contact surface 18 against the substrate 20 with considerable friction, energy being destroyed by the formation of heat. This heat can be easily dissipated through the surrounding metal parts.
  • the first buffer element 16 acts as a hard buffer, which has been known since then and which can absorb further excess impact energy under internal deformation.

Abstract

The present buffer system for a fastener driving device includes two cooperating buffer elements (16, 22) located at the bottom (17) of the driving cylinder (2). A first buffer element (16) of hard elastic material rests on the inwardly facing surface of the cylinder bottom (17) in such a manner that at least a portion of the surface (18) of the first buffer element (16) contacting the bottom (17) is movable relative to the bottom (17) of the driving cylinder (2). A second buffer element (22) made of an elastic material softer than the hard elastic material of the first buffer element, rests on the first buffer element.

Description

Die Erfindung bezieht sich auf ein Puffersystem gemäß Oberbegriff von Anspruch 1.The invention relates to a buffer system according to the preamble of claim 1.

Aus der DE-PS 23 39 163 ist dazu ein Einschlaggerät zum Einschlagen von Nägeln oder dgl. bekannt, dessen Puffersystem aus einem verhältnismäßig weichen Pufferelement aus volumenkompressiblem Werkstoff und einem damit zusammenwirkenden harten Pufferelement besteht, das mit seiner Kontaktfläche voll auf dem Boden des Zylinderfußes aufliegt.From DE-PS 23 39 163 an impact device for driving in nails or the like is known, the buffer system of which consists of a relatively soft buffer element made of volume-compressible material and a hard buffer element interacting therewith, the contact surface of which rests fully on the bottom of the cylinder base .

Dieses Puffersystem ist in der Lage, Schläge mit Drucküberschuß und Leerschläge sicher und bei hoher Lebensdauer aufzufangen. Durch den Kontakt zwischen hartem Pufferelement und Boden des Zylinderfußes entsteht jedoch bei jedem Schlag ein unangenehmer und den Bedienungsmann störender Körperschall. In extremen Fällen tritt auch eine erhebliche Verformung des harten Pufferelementes ein, das dann durch innere Reibung und Erwärmung beschädigt werden kann.This buffer system is able to absorb surges with excess pressure and empty surges safely and with a long service life. The contact between the hard buffer element and the bottom of the cylinder base creates an unpleasant structure-borne noise with each impact, which is annoying for the operator. In extreme cases there is also a considerable deformation of the hard buffer element, which can then be damaged by internal friction and heating.

Aufgabe der vorliegenden Erfindung ist daher die Schaffung eines Puffersystems der eingangs genannten Art,.das den Schlagüberschuß bei möglichst geringem Körperschall und bei möglichst hoher Lebensdauer sicher auffängt und vernichtet.The object of the present invention is therefore to create a buffer system of the type mentioned at the outset which reliably absorbs and destroys the excess of impact with the lowest possible structure-borne noise and with the longest possible service life.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Die bewegbare Anordnung des harten Pufferelements bedeutet die Zwischenschaltung einer Reibungsstufe zwischen der weichen Federkennlinie des weichen Pufferelements und der harten Federkennlinie des harten Pufferelements. Beim normalen Nageln mit wenig Drucküberschuß wird nur der weiche Teil der Federkennlinie ausgenützt, erst bei Leerschlägen kommt der harte Teil zum Tragen. Dies führt zu einer deutlichen Reduzierung des Körperschalls beim normalen Nageln, dessen Verminderung bis zu 6 dB, also nahezu eine Halbierung betragen kann.The movable arrangement of the hard buffer element means the interposition of a friction stage between the soft spring characteristic of the soft buffer element and the hard spring characteristic of the hard buffer element. With normal nailing with little excess pressure, only the soft part of the spring characteristic is used; the hard part only comes into play when there are no blows. This leads to a significant reduction in structure-borne noise during normal nailing, the reduction of which can be up to 6 dB, i.e. almost a halving.

Bei einer vorteilhaften Ausführungsform ist das harte Pufferelement mit Vorspannung im Zylinder angeordnet, so daß es beim Zusammendrücken vom weichen Pufferelement noch stärker an den Außenring angedrückt wird. Beim weiteren Zusammendrücken wird dann die überschüssige Schlagenergie durch Reibung an den Kontaktflächen zwischen hartem Pufferelement und Zylinderfuß bzw. Innenwand des Zylinders vernichtet, wobei die dabei entstehende Wärme gut abgeführt werden kann.In an advantageous embodiment, the hard buffer element is arranged with a prestress in the cylinder, so that it is pressed even more against the outer ring by the soft buffer element when compressed. Upon further compression, the excess impact energy is then destroyed by friction on the contact surfaces between the hard buffer element and the cylinder base or inner wall of the cylinder, and the heat generated can be dissipated well.

Liegt das harte Pufferelement mit seiner ganzen Kontaktfläche auf dem Boden des Zylinderfußes auf, dann wirkt es wie bei der bekannten Ausführung als harter, verformbarer Puffer, der durch innere Reibung stark erwärmt wird. Diese innere Erwärmung kann zwar auch zur Zerstörung des harten Pufferelementes führen-, gleichzeitig tritt jedoch eine Erhöhung des Körperschalles auf, der dem Bedienungsmann zeigt, daß ein Auswechseln des Pufferelements nötig ist. Damit wird eine Beschädigung oder Zerstörung von Teilen des Einschlaggerätes sicher vermieden.If the hard buffer element lies with its entire contact surface on the bottom of the cylinder base, then it acts as in the known design as a hard, deformable buffer, which is heated up considerably by internal friction. This internal heating can also lead to the destruction of the hard buffer element, but at the same time there is an increase in structure-borne noise, which shows the operator that the buffer element must be replaced. This reliably prevents damage or destruction of parts of the wrapping device.

Wird das Einschlaggerät in bekannter Weise mit einem Luftspeicher versehen, der zur Speicherung der für den Rückhub des Schlagkolbens nötigen Druckluft dient, dann bietet die erfindungsgemäße Ausführung des Puffersystems den weiteren Vorteil, daß diese Druckluft beim Rückhub des Schlagkolbens nur langsam und damit leiser aus dem Zylinder entweicht,If the wrapping device is provided in a known manner with an air reservoir which is used to store the compressed air required for the return stroke of the percussion piston, then the design of the buffer system according to the invention offers the further advantage that this compressed air is only slowly and therefore quieter from the cylinder during the return stroke of the percussion piston escapes

Figure imgb0001
das weiche Pufferelement auf dem harten Pufferelement aufliegt und damit den Querschnitt der Entlüftungsöffnung stark beschränkt.
Figure imgb0001
the soft buffer element rests on the hard buffer element and thus severely limits the cross section of the vent opening.

Im folgenden ist ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnungen näher beschrieben.An exemplary embodiment of the invention is described in more detail below with reference to the drawings.

Es zeigen:

  • Fig. 1 Längsschnitt durch ein Einschlaggerät mit Puffersystem
  • Fig. 2 Längsschnitt durch das Puffersystem, linke Hälfte entspannt, rechte Hälfte zusammengedrückt.
Show it:
  • Fig. 1 longitudinal section through a wrapping device with buffer system
  • Fig. 2 longitudinal section through the buffer system, left half relaxed, right half compressed.

Bei dem in Fig. 1 teilweise dargestellten Einschlaggerät für Nägel oder dgl. ist in einem Gehäuse 1 ein Zylinder 2 angeordnet, in dem ein Schlagkolben 3 mit einem Schlagstößel 4 verschiebbar gelagert ist. Durch einen Handgriff 5 wird dem Einschlaggerät Druckluft von einer nicht dargestellten Druckluftquelle zugeführt und gelangt nach Betätigung von Abzugshebel 6 durch Betätigung eines rohrförmigen Ventilschiebers 7 in den Innenraum von Zylinder 2, wo die Druckluft den durch eine elastische Rastvorrichtung 8 festgehaltenen Schlagkolben 3 in Richtung Zylinderfuß 9 beschleunigt. Dabei wird in bekannter Weise durch Schlagstößel 4 der Nagel 10 in ein nicht dargestelltes Werkstück eingeschlagen. Weitere Nägel 10 sind in einem Magazin 11 bereitgestellt.1, a cylinder 2 is arranged in a housing 1, in which a percussion piston 3 is displaceably mounted with a percussion plunger 4. Compressed air is supplied to the impact device from a compressed air source (not shown) by a handle 5 and, after actuation of the trigger 6, reaches the interior of cylinder 2 by actuation of a tubular valve slide 7, where the compressed air pushes the percussion piston 3 held by an elastic latching device 8 in the direction of the cylinder base 9 accelerates. The nail 10 is knocked into a workpiece, not shown, in a known manner by means of a ram 4. Additional nails 10 are provided in a magazine 11.

Der Zylinder 2 ist von einem Luftspeicher 12 umgeben, in den beim Schlaghub in bekannter Weise Druckluft durch Öffnungen 13 und 14 in Zylinder 2 gelangt. Diese Druckluft wirkt nach Loslassen von Abzugshebel 6 auf die Unterseite von Schlagkolben 3 und befördert diesen wieder in seine Ausgangsstellung.The cylinder 2 is surrounded by an air reservoir 12, into which compressed air passes through openings 13 and 14 in cylinder 2 in a known manner during the stroke stroke. After releasing trigger 6, this compressed air acts on the underside of percussion piston 3 and conveys it back to its starting position.

Am unteren Ende eines Schlaghubes trifft der Schlagkolben 3 auf ein Puffersystem 15, das in Fig. 2 vergrößert dargestellt ist. Es besteht aus einem ersten, hartelastischen Pufferelement 16, das zweckmäßigerweise aus vernetztem Polyurethan besteht. Seine gegen den konischen Boden 17 von Zylinderfuß 9 gerichtete Kontaktfläche 18 ist ebenfalls kegelstumpfartig ausgebildet, sein Kegelwinkel ist jedoch kleiner als der Kegelwinkel des Bodens. Bei entspannter Stellung des Puffersystems besteht daher zwischen Boden 17 und Kontaktfläche 18 ein Zwischenraum 19, während Pufferelement.16 am Bodengrund 20 anliegt.At the lower end of an impact stroke, the impact piston 3 meets a buffer system 15, which is shown enlarged in FIG. 2. It consists of a first, hard-elastic buffer element 16, which expediently consists of cross-linked polyurethane. Its contact surface 18 directed against the conical bottom 17 of the cylinder base 9 is also frustoconical, but its cone angle is smaller than the cone angle of the bottom. When the buffer system is in a relaxed position, there is an intermediate space 19 between the base 17 and the contact surface 18, while the buffer element 16 lies against the base 20.

Das Pufferelement 16 weist weiterhin einen zylindrischen Abschnitt 21 auf, dessen Außendurchmesser größer ist als der Innendurchmesser von Zylinder 2, so daß das Pufferelement 16 mit Vorspannung im Zylinder 2 angeordnet ist.The buffer element 16 furthermore has a cylindrical section 21, the outer diameter of which is larger than the inner diameter of cylinder 2, so that the buffer element 16 is arranged in cylinder 2 with prestress.

Gegen den Schlagkolben 3 gerichtet sitzt auf dem ersten Pufferelement 16 ein zweites Pufferelement 22 auf, das vorzugsweise aus zelligem Polyurethan-Elastomer besteht. Durch die zellige Struktur wird in bekannter Weise eine progressive Federkennlinie erreicht, seine gegen den Schlagkolben 3 gerichtete Stirnfläche 23 ist nach außen abgeschrägt. Der Schlagkolben 3 weist eine zylindrische Vertiefung 24 auf, deren Innendurchmesser etwas größer ist als der Außendurchmesser von Pufferelement 22.A second buffer element 22, which preferably consists of cellular polyurethane elastomer, is seated on the first buffer element 16 against the percussion piston 3. Due to the cellular structure, a progressive spring characteristic is achieved in a known manner, its end face 23 directed against the percussion piston 3 is chamfered to the outside. The percussion piston 3 has a cylindrical recess 24, the inside diameter of which is somewhat larger than the outside diameter of the buffer element 22.

Fig. 2, linke Hälfte, zeigt das Puffersystem 15 in entspanntem Zustand, wobei der Schlagkolben 3 gerade das zweite Pufferelement'22 berührt. Zwischen Boden 17 und Kontaktfläche 18 besteht ein Zwischenraum 19. Zur Vernichtung der überschüssigen Schlagenergie wird jetzt das Puffersystem 15 zusammengedrückt, wie Fig. 2, rechte Hälfte, zeigt. Dabei wird das erste Pufferelement 16 durch das verdichtete zweite Pufferelement 22 so gespreizt, daß sich sein zylindrischer Abschnitt 21 über die Vorspannung hinaus gegen Zylinder 2 preßt. Beim weiteren Abbremsen des Schlagkolbens 3 verschiebt sich einmal der zylindrische Abschnitt 21 gegen Zylinder 2 und Teile der Kontaktfläche 18 gegen den Bodengrund 20 unter erheblicher Reibung, wobei Energie unter Bildung von Wärme vernichtet wird. Diese Wärme läßt sich über die umgebenden Metallteile gut abführen.2, left half, shows the buffer system 15 in a relaxed state, the percussion piston 3 just touching the second buffer element 22. There is a space 19 between the bottom 17 and the contact surface 18. The buffer system 15 is now compressed to destroy the excess impact energy, as shown in FIG. 2, right half. The first buffer element 16 is spread by the compressed second buffer element 22 so that its cylindrical section 21 presses against cylinder 2 beyond the preload. When the percussion piston 3 is further braked once the cylindrical section 21 moves against the cylinder 2 and parts of the contact surface 18 against the substrate 20 with considerable friction, energy being destroyed by the formation of heat. This heat can be easily dissipated through the surrounding metal parts.

Liegt Kontaktfläche 18 vollständig am Boden 17 auf, dann wirktdas erste Pufferelement 16 wie seither bekannt als harter Puffer, der unter innerer Verformung noch weitere überschüssige Schlagenergie aufnehmen kann.If the contact surface 18 lies completely on the floor 17, then the first buffer element 16 acts as a hard buffer, which has been known since then and which can absorb further excess impact energy under internal deformation.

Bei der eben beschriebenen Reibungsphase des Puffersystems 15 wird wenig Körperschall erzeugt bei äußerster Schonung der Pufferelemente. Tritt nach einer gewissen Zeit doch eine Abnützung der Pufferelemente ein, dann verstärkt sich der Körperschall und der Bedienungsmann wird darauf aufmerksam gemacht, daß die Pufferelemente ausgewechselt werden müssen.In the friction phase of the buffer system 15 just described, little structure-borne noise is generated with the utmost protection of the buffer elements. If the buffer elements wear after a certain time, the structure-borne noise increases and the operator is made aware that the buffer elements must be replaced.

Claims (8)

1) Puffersystem bei Einschlaggeräten zum Einschlagen von Nägeln od. dgl. mittels eines in einem Zylinder geführten, durch Druckluft beaufschlagbaren Schlagkolbens mit folgenden Merkmalen: a) das Puffersystem ist am einschlagseitigen Ende des Zylinders zur Aufnahme der überschüssigen Schlagenergie des Schlagkolbens angeordnet b) es besteht aus mindestens zwei Pufferelementen verschiedener Härte c) ein erstes hartelastisches Pufferelement liegt auf einem den Zylinder begrenzenden Boden auf d) ein zweites,weichelastisches Pufferelement wirkt mit dem ersten Pufferelement zusammendadurch gekennzeichnet , daß das erste Pufferelement (16) mit mindestens einem Teil seiner gegen den Zylinderfuß (9) gerichteten Kontaktfläche (18) bewegbar am Boden (17) angeordnet ist.1) Buffer system for driving tools for driving in nails or the like by means of a percussion piston guided in a cylinder, which can be acted upon by compressed air, with the following features: a) the buffer system is arranged on the impact-side end of the cylinder for absorbing the excess impact energy of the percussion piston b) it consists of at least two buffer elements of different hardness c) a first hard-elastic buffer element rests on a bottom delimiting the cylinder d) a second, soft-elastic buffer element interacts with the first buffer element characterized in that the first buffer element (16) is movably arranged on the floor (17) with at least part of its contact surface (18) directed against the cylinder base (9). 2) Puffersystem nach Anspruch 1, dadurch gekenn- zeichnet, daß zwischen einem Teil der Kontaktfläche (18) des ersten Pufferelements (16) und dem Boden (17) ein Zwischenraum (19) vorgesehen ist.2) Buffer system according to claim 1, characterized in that an intermediate space (19) is provided between part of the contact surface (18) of the first buffer element (16) and the bottom (17). 3) Puffersystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das erste Pufferelement (16) als topfförmiger Kegelstumpf ausgebildet ist, der mindestens teilweise auf dem konischen Boden (17) aufliegt.3) Buffer system according to claim 1 or 2, characterized in that the first buffer element (16) is designed as a cup-shaped truncated cone, which lies at least partially on the conical bottom (17). 4) Puffersystem nach Anspruch 3, dadurch gekenn- zeichnet, daß der Kegelwinkel der Kontaktfläche (18) des ersten Pufferelements (16) kleiner ist als der Kegelwinkel des Bodens (17).4) Buffer system according to claim 3, characterized in that the cone angle of the contact surface (18) of the first buffer element (16) is smaller than the cone angle of the bottom (17). 5) Puffersystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet , daß das erste Pufferelement (16) an seinem äußeren Umfang einen zylindrischen Abschnitt (21) aufweist, dessen Außendurchmesser größer ist als der Innendurchmesser des das erste Pufferelement (16) umgebenden Zylinders (2).5) Buffer system according to one of claims 1 to 4, characterized in that the first buffer element (16) has on its outer periphery a cylindrical portion (21) whose outer diameter is larger than the inner diameter of the cylinder surrounding the first buffer element (16) ( 2). 6) Puffarsystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet , daß das zweite Pufferelement (22) auf dem ersten Pufferelement (16) angeordnet ist.6) buffer system according to one of claims 1 to 5, characterized in that the second buffer element (22) is arranged on the first buffer element (16). 7) Puffersystem nach Anspruch 6, dadurch gekennzeichnet , daß der Schlagkolben (3) eine gegen das Puffersystem (15) offene Vertiefung (24) aufweist, deren Innendurchmesser größer ist als der Außendurchmesser des zweiten Pufferelements (22).7) Buffer system according to claim 6, characterized in that the percussion piston (3) has a recess (24) open against the buffer system (15), the inner diameter of which is larger than the outer diameter of the second buffer element (22). 8) Puffersystem nach Anspruch 7, dadurch gekennzeichnet , daß die gegen den Schlagkolben (3) gerichtete Stirnfläche (23) des zweiten Pufferelements (22) nach außen abgeschrägt ist.8) Buffer system according to claim 7, characterized in that the end face (23) of the second buffer element (22) directed against the percussion piston (3) is chamfered to the outside.
EP81110132A 1980-12-18 1981-12-04 Buffer system in impact tools Expired EP0054782B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110132T ATE15777T1 (en) 1980-12-18 1981-12-04 BUFFER SYSTEM FOR IMPACT DEVICES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3047662 1980-12-18
DE3047662A DE3047662C2 (en) 1980-12-18 1980-12-18 Buffer system for impact devices

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EP0054782A2 true EP0054782A2 (en) 1982-06-30
EP0054782A3 EP0054782A3 (en) 1983-07-20
EP0054782B1 EP0054782B1 (en) 1985-09-25

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US (1) US4441644A (en)
EP (1) EP0054782B1 (en)
JP (1) JPS57121484A (en)
AT (1) ATE15777T1 (en)
CA (1) CA1157201A (en)
DE (1) DE3047662C2 (en)

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US4515303A (en) * 1982-08-28 1985-05-07 Robert Bosch Gmbh Electric hammering apparatus with air-cushioned armature
GB2149712A (en) * 1983-11-14 1985-06-19 Umberto Monacelli Shock absorber arrangements for use in fastener driving apparatus
US4611742A (en) * 1984-10-09 1986-09-16 Robert Bosch Gmbh Electromagnetically operated driving tool with air damper
EP0661140A1 (en) * 1993-12-03 1995-07-05 Kanematsu-Nnk Corporation Fastener driving tool

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DE3412659A1 (en) * 1983-06-27 1985-01-17 Jürgen Ing.(grad.) 6600 Saarbrücken Hochstrasser TURNING DEVICE OPERATING ALTERNATELY IN OPPOSITE DIRECTIONS TO EASIER THE DRIVING IN OR EXTRACTION OF TUNING TUBES
DE3702364A1 (en) * 1987-01-28 1988-08-04 Mo N Proizv Ob Mekh HAND TOOL for driving in fasteners
US4932480A (en) * 1988-12-16 1990-06-12 Illinois Tool Works Inc. Driving tool with air-cooled bumper
US5062857A (en) * 1990-06-05 1991-11-05 Advanced Prosthestetics Development Corporation Myoelectrically controlled knee joint locking device
US5224413A (en) * 1992-07-13 1993-07-06 Mosier Industries, Inc. Impact dampening means for power cylinders
DE9216394U1 (en) * 1992-12-02 1993-02-11 Joh. Friedrich Behrens Ag, 2070 Ahrensburg, De
US5511759A (en) * 1994-05-26 1996-04-30 Steelcase, Inc. Hydraulic chair height adjustment mechanism
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Also Published As

Publication number Publication date
ATE15777T1 (en) 1985-10-15
EP0054782A3 (en) 1983-07-20
JPH0211388B2 (en) 1990-03-14
DE3047662A1 (en) 1982-07-22
DE3047662C2 (en) 1985-02-21
EP0054782B1 (en) 1985-09-25
JPS57121484A (en) 1982-07-28
US4441644A (en) 1984-04-10
CA1157201A (en) 1983-11-22

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