EP1352718A1 - Pneumatic percussive system - Google Patents

Pneumatic percussive system Download PDF

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Publication number
EP1352718A1
EP1352718A1 EP03405216A EP03405216A EP1352718A1 EP 1352718 A1 EP1352718 A1 EP 1352718A1 EP 03405216 A EP03405216 A EP 03405216A EP 03405216 A EP03405216 A EP 03405216A EP 1352718 A1 EP1352718 A1 EP 1352718A1
Authority
EP
European Patent Office
Prior art keywords
impact
guide tube
piston
flying piston
tool
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.)
Granted
Application number
EP03405216A
Other languages
German (de)
French (fr)
Other versions
EP1352718B1 (en
Inventor
Karl Echtler
Martin Richter
Lutz Troeder
Stefan Wanninger
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1352718A1 publication Critical patent/EP1352718A1/en
Application granted granted Critical
Publication of EP1352718B1 publication Critical patent/EP1352718B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D11/00Portable percussive tools with electromotor or other motor drive
    • B25D11/06Means for driving the impulse member
    • B25D11/12Means for driving the impulse member comprising a crank mechanism
    • B25D11/125Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06Hammer pistons; Anvils ; Guide-sleeves for pistons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2217/00Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011Details of anvils, guide-sleeves or pistons
    • B25D2217/0023Pistons

Definitions

  • the invention refers to a pneumatic percussion with a hinund by an air spring moved air piston, preferably for use in at least partially beating Hand power tools.
  • an electromechanically driven striking mechanism has a Hand tool a, in a guide tube by an air spring back and forth herded flying pistons pointing to an anvil and this the front end of an in a tool holder recorded tool beats.
  • the flying piston and the Anvils are usually made of steel, which at sufficiently high mass density for Impact pulse generation also high toughness and strength is achieved.
  • US2283292 has a pneumatic percussion a Electric hand tool one in a guide tube by an air spring back and forth moved flying piston out of steel.
  • the flying piston in the impact contact area a cylindrical insert made of another, shock-resistant material.
  • the non-impact-stressed inner core of the flying piston is also made a metal heavier in steel.
  • Such multi-part aircraft pistons point through the Impact damage of the interfaces on a reduced life and are also technologically complex in production.
  • the task is to realize a striking mechanism for use in the environment strong magnetic fields.
  • a percussion mechanism reciprocates through an air spring Flying piston on which directly or by means of an intermediate Döppers on the Front end of a striking tool received in a tool holder strikes, wherein the one-piece manufactured air piston and / or the striker from a non-ferromagnetic, advantageously curable material.
  • the one-piece execution of the flying piston and / or Döppers from a nonferromagnetic material allows full full life Functionality of the impact mechanism even in the environment of strong magnetic fields, such as practical experiments resulted.
  • the material is similar mass-dense and / or tough as steel, eg.
  • One non-ferromagnetic steel alloy as a conventional chromium-nickel-iron alloy bzpw. V2A or V4A or a hardenable alloy such as X90CrMoV18, creating one for components from steel dimensioned impact mechanism dynamics is still accepted, which is technologically advantageous.
  • both the striker and the flying piston from a nonferromagnetic material, thereby further causing magnetically induced sticking is suppressed.
  • the flying piston is guided in a guide tube, which continues advantageous from a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically effected Sticking to the guide tube is suppressed.
  • a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy
  • a hand tool on such a percussion whereby this in environments with strong, especially static, magnetic fields can be used.
  • a common power hand tool in the form of an at least partially beating Kombihammers has one in a guide tube made of a magnesium-aluminum alloy guided, reciprocated by an air spring on the piston, which als meets an anvil, which is on the front end of a recorded in a tool holder Impact tool like a chisel strikes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The pneumatic impact tool has an air spring operated piston which directly or indirectly engages an intermediate anvil on the front end of the tool in a holder. The impact head and anvil are made of a non ferromagnetic material. The impact head and anvil surfaces can be non-magnetic steel covered. The piston can be guided in a guide tube, which is also of non ferro magnetic material.

Description

Die Erfindung bezeichnet ein pneumatisches Schlagwerk mit einem durch eine Luftfeder hinund herbewegten Flugkolben, vorzugsweise zum Einsatz in zumindest teilweise schlagenden Handwerkzeugmaschinen.The invention refers to a pneumatic percussion with a hinund by an air spring moved air piston, preferably for use in at least partially beating Hand power tools.

Üblicherweise weist ein elektromechanisch angetriebenes Schlagwerk einer Handwerkzeugmaschine einen, in einem Führungsrohr durch eine Luftfeder hin- und herbewegten Flugkolben auf, welche auf einen Döpper und dieser das Stirnende eines in einer Werkzeugaufnahme aufgenommenen Werkzeugs schlägt. Der Flugkolben und der Döpper bestehen üblicherweise aus Stahl, wodurch bei hinreichend hoher Massendichte zur Schlagimpulserzeugung auch eine hohe Zähigkeit und Festigkeit erzielt wird.Usually, an electromechanically driven striking mechanism has a Hand tool a, in a guide tube by an air spring back and forth herded flying pistons pointing to an anvil and this the front end of an in a tool holder recorded tool beats. The flying piston and the Anvils are usually made of steel, which at sufficiently high mass density for Impact pulse generation also high toughness and strength is achieved.

Bei Sonderanwendung von Handwerkzeugmaschinen in Umgebungen mit starken, insbesondere statischen, Magnetfeldern, wie sie bspw. in der Nähe von Aluminiumschmelzanlagen auftreten, besteht bei einem Schlagwerk mit üblichen Flugkolben und/oder Döppern aus magnetisierbarem Material wie Stahl vermittelt durch ein starkes, das Schlagwerk durchsetzendes, Magnetfeld die Möglichkeit eines magnetisch bewirkten Festklebens des Flugkolbens insbesondere in seiner Ruhelage, wodurch die zweckbestimmte Nutzung des Schlagwerks gestört oder gänzlich verhindert wird.For special applications of hand tool machines in environments with strong, especially static, magnetic fields, such as those in the vicinity of Aluminum melting plants occur, consists in a striking mechanism with conventional flying pistons and / or doublers made of magnetizable material such as steel mediated by a strong, the Schlagwerk enforcing, magnetic field the possibility of a magnetically effected Sticking the flying piston in particular in its rest position, whereby the intended use of the percussion disturbed or completely prevented.

Nach der US2283292 weist ein pneumatisches Schlagwerk einer Elektrohandwerkzeugmaschine einen in einem Führungsrohr durch eine Luftfeder hin- und herbewegten Flugkolben aus Stahl auf.According to US2283292 has a pneumatic percussion a Electric hand tool one in a guide tube by an air spring back and forth moved flying piston out of steel.

Nach der US3114421 sowie der US4602689 weist der Flugkolben im Schlagkontaktbereich einen zylinderförmigen Einsatz aus einem anderen, schlaggeeigneten Material auf. Nach der US4602689 besteht der nicht schlagbeanspruchte innere Kern des Flugkolbens zudem aus einem bezüglich Stahl schwereren Metall. Derartige mehrteilige Flugkolben weisen durch die Schlagschädigung der Trennflächen eine verminderte Lebensdauer auf und sind zudem technologisch aufwendig in der Fertigung. According to US3114421 and US4602689, the flying piston in the impact contact area a cylindrical insert made of another, shock-resistant material. After US4602689, the non-impact-stressed inner core of the flying piston is also made a metal heavier in steel. Such multi-part aircraft pistons point through the Impact damage of the interfaces on a reduced life and are also technologically complex in production.

Die Aufgabe besteht in der Realisierung eines Schlagwerks zur Nutzung in der Umgebung starker Magnetfelder.The task is to realize a striking mechanism for use in the environment strong magnetic fields.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claims. Advantageous developments emerge from the subclaims.

Im wesentlichen weist ein Schlagwerk einen durch eine Luftfeder hin- und herbewegten Flugkolben auf, welche direkt oder mittels eines zwischengeordneten Döppers auf das Stirnende eines in einer Werkzeugaufnahme aufgenommenen Schlagwerkzeugs schlägt, wobei der aus einem Stück gefertigte Flugkolben und/oder der Döpper aus einem nichtferromagnetischem, vorteilhaft härtbarem Material besteht.Essentially, a percussion mechanism reciprocates through an air spring Flying piston on which directly or by means of an intermediate Döppers on the Front end of a striking tool received in a tool holder strikes, wherein the one-piece manufactured air piston and / or the striker from a non-ferromagnetic, advantageously curable material.

Die aus einem Stück gefertigte Ausführung des Flugkolbens und/oder Döppers aus einem nichtferromagnetischem Material ermöglicht bei voller Lebensdauer die volle Funktionsfähigkeit des Schlagwerks auch in der Umgebung starker Magnetfelder, wie praktische Versuche ergaben.The one-piece execution of the flying piston and / or Döppers from a nonferromagnetic material allows full full life Functionality of the impact mechanism even in the environment of strong magnetic fields, such as practical experiments resulted.

Die derzeit noch unklare physikalische Ursache könnte sowohl in einer vollständigen oder lokalen Magnetisierung dieser miteinander verklebenden Bauteile liegen, welche durch die Schlagbeanspruchung unterstützt wird, als auch in der Anziehung divergenter Magnetfeldkomponenten auf die Aussenkonturen dieser, stark vom magnetischen Fluss durchsetzten, ferromagnetischen Bauteile. Die auf ein nur paramagnisches Bauteil wirkenden Kräfte wären hingegen vernachlässigbar klein. Somit sollte durch zumindest ein nichtferromagnetisches Bauteil die Ursache des Verklebens beseitigt sein.The currently unclear physical cause could be found in either a complete or local magnetization of these mutually adhesive components, which by the Impact stress is supported, as well as in attraction divergent Magnetic field components on the outer contours of these, strong of the magnetic flux interspersed, ferromagnetic components. The only one paramagnetic component On the other hand, acting forces would be negligibly small. Thus, by at least one non-ferromagnetic component eliminates the cause of the sticking.

Vorteilhaft ist das Material ähnlich massendicht und/oder zähefest wie Stahl, bspw. eine nichtferromagnetische Stahllegierung wie eine übliche Chrom-Nickel-Eisen Legierung bzpw. V2A oder V4A oder eine härtbare Legierung wie X90CrMoV18, wodurch eine für Bauteile aus Stahl dimensionierte Schlagwerksdynamik unverändert übernehmbar ist, was technologisch vorteilhaft ist.Advantageously, the material is similar mass-dense and / or tough as steel, eg. One non-ferromagnetic steel alloy as a conventional chromium-nickel-iron alloy bzpw. V2A or V4A or a hardenable alloy such as X90CrMoV18, creating one for components from steel dimensioned impact mechanism dynamics is still accepted, which is technologically advantageous.

Vorteilhaft besteht sowohl der Döpper als auch der Flugkolben aus einem nichtferromagnetischem Material, wodurch ein magnetisch bewirktes Festkleben weiter unterdrückt wird.Advantageously, both the striker and the flying piston from a nonferromagnetic material, thereby further causing magnetically induced sticking is suppressed.

Vorteilhaft ist der Flugkolben in einem in einem Führungsrohr geführt, welches weiter vorteilhaft aus einem nichtferromagnetischen, vorzugsweise diamagnetischem Material wie einer Magnesium-Aluminium-Legierung besteht, wodurch ein magnetisch bewirktes Festkleben am Führungsrohr unterdrückt wird.Advantageously, the flying piston is guided in a guide tube, which continues advantageous from a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically effected Sticking to the guide tube is suppressed.

Vorteilhaft weist ein Handwerkzeugmaschine ein derartiges Schlagwerk auf, wodurch dieses in in Umgebungen mit starken, insbesondere statischen, Magnetfeldern einsetzbar ist.Advantageously, a hand tool on such a percussion, whereby this in environments with strong, especially static, magnetic fields can be used.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels nachfolgend näher erläutert.The invention will be more closely related to an advantageous embodiment below explained.

Eine übliche Elektrohandwerkzeugmaschine in Form eines zumindest teilweise schlagenden Kombihammers weist einen in einem Führungsrohr aus einer Magnesium-Aluminium-Legierung geführten, über eine Luftfeder hin- und herbewegten Flugkolben auf, welcher auf einen Döpper trifft, der auf das Stirnende eines in eine Werkzeugaufnahme aufgenommenen Schlagwerkzeugs wie einen Meissel schlägt. Der im Vergleich zur üblichen Standardserie der Elektrohandwerkzeugmaschine die gleiche Geometrie aufweisende und technologisch weitgehend gleichartig fertigbare Flugkolben und Döpper besteht jedoch statt aus ferromagnetischem Stahl aus einer nichtferromagnetischen Chrom-Nickel-Stahl-Legierung, speziell aus V4A.A common power hand tool in the form of an at least partially beating Kombihammers has one in a guide tube made of a magnesium-aluminum alloy guided, reciprocated by an air spring on the piston, which auf meets an anvil, which is on the front end of a recorded in a tool holder Impact tool like a chisel strikes. The compared to the usual standard series the electric hand tool machine having the same geometry and technological However, largely similar manufacturable flying piston and anvil is instead of ferromagnetic steel made of a non-ferromagnetic chromium-nickel-steel alloy, specially made of V4A.

Claims (8)

Schlagwerk mit einem, durch eine Luftfeder hin- und herbewegten Flugkolben, welche direkt oder mittels eines zwischengeordneten Döppers auf das Stirnende eines in einer Werkzeugaufnahme aufgenommenen Werkzeugs schlägt, dadurch gekennzeichnet, dass der aus einem Stück gefertigte Flugkolben und/oder der Döpper aus einem nichtferromagnetischem Material besteht.Impact mechanism with a, by an air spring reciprocating flying piston which strikes directly or by means of an intermediate Dopppers on the front end of a recorded in a tool holder tool, characterized in that the made of one piece flying piston and / or the striker from a non-ferromagnetic material consists. Schlagwerk nach Anspruch 1, dadurch gekennzeichnet, dass das Material ähnlich massendicht und/oder zähefest wie Stahl ist.Impact device according to claim 1, characterized in that the material is similar mass-dense and / or tough as steel. Schlagwerk nach Anspruch 2, dadurch gekennzeichnet, dass das Material eine nichtferromagnetische, optional härtbare, Stahllegierung ist.Impact device according to claim 2, characterized in that the material is a non-ferromagnetic, optionally hardenable, steel alloy. Schlagwerk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sowohl der Döpper als auch der Flugkolben aus einem nichtferromagnetischem Material besteht.Impact mechanism according to one of claims 1 to 3, characterized in that both the striker and the flying piston consists of a non-ferromagnetic material. Schlagwerk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Flugkolben in einem in einem Führungsrohr geführt ist.Impact mechanism according to one of claims 1 to 3, characterized in that the flying piston is guided in one in a guide tube. Schlagwerk nach Anspruch 5, dadurch gekennzeichnet, dass das Führungsrohr aus einem nichtferromagnetischen Material besteht.Impact device according to claim 5, characterized in that the guide tube consists of a non-ferromagnetic material. Schlagwerk nach Anspruch 6, dadurch gekennzeichnet, dass das Führungsrohr aus einem diamagnetischem Material besteht.Impact mechanism according to claim 6, characterized in that the guide tube consists of a diamagnetic material. Handwerkzeugmaschine, dadurch gekennzeichnet, dass ein Schlagwerk nach einem der vorherigen Ansprüche vorhanden ist.Hand tool machine, characterized in that a striking mechanism according to one of the preceding claims is available.
EP03405216A 2002-04-11 2003-04-01 Pneumatic percussive system Expired - Lifetime EP1352718B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10216051A DE10216051A1 (en) 2002-04-11 2002-04-11 Pneumatic striking mechanism
DE10216051 2002-04-11

Publications (2)

Publication Number Publication Date
EP1352718A1 true EP1352718A1 (en) 2003-10-15
EP1352718B1 EP1352718B1 (en) 2006-03-29

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ID=28051253

Family Applications (1)

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EP03405216A Expired - Lifetime EP1352718B1 (en) 2002-04-11 2003-04-01 Pneumatic percussive system

Country Status (5)

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US (1) US20040000414A1 (en)
EP (1) EP1352718B1 (en)
JP (1) JP2003311650A (en)
CN (1) CN1449898A (en)
DE (2) DE10216051A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047606A1 (en) * 2004-09-30 2006-04-06 Hilti Ag Drill and / or chisel hammer
NL1030643C2 (en) * 2005-12-12 2007-06-13 Arie Koenraad Jan Rokus Horden Demolition hammer, has striker driven by magnetic force from electromagnetic coil and guided in tool length axis direction
GB0912283D0 (en) 2009-07-15 2009-08-26 Black & Decker Inc Motor driven hammer having means for controlling the power of impact
DE102012013409A1 (en) * 2012-05-23 2013-11-28 Atlas Copco Construction Tools Gmbh impact device
WO2019079560A1 (en) 2017-10-20 2019-04-25 Milwaukee Electric Tool Corporation Percussion tool
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool
GB2599623B (en) * 2020-08-12 2023-09-20 Caterpillar Inc Elastomer-mounted split ring

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402776A (en) * 1965-05-12 1968-09-24 Evgeny Vsevolodovich Alexandrov Device for impact loading a solid body
EP0759341A2 (en) * 1995-08-18 1997-02-26 Makita Corporation Hammer drill with an idling strike prevention mechanism

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2242944B2 (en) * 1972-08-31 1981-04-23 Robert Bosch Gmbh, 7000 Stuttgart Hammer drill
JP3413991B2 (en) * 1994-10-14 2003-06-09 日立工機株式会社 Driving machine piston device
DE19843642B4 (en) * 1998-09-23 2004-03-25 Wacker Construction Equipment Ag Air spring hammer mechanism with return air spring
DE10033362A1 (en) * 2000-07-08 2002-01-17 Hilti Ag Electric hand tool with empty stroke shutdown
DE10103141A1 (en) * 2001-01-24 2002-07-25 Hilti Ag Electrical hand tool appliance e.g. hammer drill, has pneumatic striking tool and valve openings sealed off to vent pneumatic spring through riveting header

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402776A (en) * 1965-05-12 1968-09-24 Evgeny Vsevolodovich Alexandrov Device for impact loading a solid body
EP0759341A2 (en) * 1995-08-18 1997-02-26 Makita Corporation Hammer drill with an idling strike prevention mechanism

Also Published As

Publication number Publication date
DE50302805D1 (en) 2006-05-18
US20040000414A1 (en) 2004-01-01
EP1352718B1 (en) 2006-03-29
JP2003311650A (en) 2003-11-05
DE10216051A1 (en) 2003-10-23
CN1449898A (en) 2003-10-22

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