EP1352718B1 - Pneumatic percussive system - Google Patents
Pneumatic percussive system Download PDFInfo
- Publication number
- EP1352718B1 EP1352718B1 EP03405216A EP03405216A EP1352718B1 EP 1352718 B1 EP1352718 B1 EP 1352718B1 EP 03405216 A EP03405216 A EP 03405216A EP 03405216 A EP03405216 A EP 03405216A EP 1352718 B1 EP1352718 B1 EP 1352718B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ferromagnetic
- percussive system
- flying piston
- piston
- steel
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000005294 ferromagnetic effect Effects 0.000 claims description 8
- 239000003302 ferromagnetic material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000002889 diamagnetic material Substances 0.000 claims description 2
- 238000010348 incorporation Methods 0.000 claims 1
- 230000005291 magnetic effect Effects 0.000 description 7
- 238000009527 percussion Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0023—Pistons
Definitions
- the invention refers to a pneumatic percussion mechanism with a reciprocating air piston reciprocated by an air spring, preferably for use in at least partially striking hand-held power tools.
- an electromechanically driven striking mechanism of a hand tool machine has a reciprocating piston which is reciprocated in a guide tube by an air spring and strikes an anvil and the front end of a tool accommodated in a tool holder.
- the flying piston and the striker are usually made of steel, whereby at sufficiently high mass density for impact pulse generation also high toughness and strength is achieved.
- US2283292 has a pneumatic percussion of a power hand tool a reciprocating in a guide tube by an air spring piston blade made of steel.
- the flying piston in the impact contact region has a cylindrical insert made of another, shock-resistant material.
- the non-impact-stressed inner core of the flying piston also consists of a metal heavier with respect to steel.
- Such multi-part flying pistons have a reduced lifetime due to the impact damage of the separating surfaces and are also technologically complicated to manufacture.
- the US3402776 discloses a percussion mechanism with a reciprocating flying piston which strikes, directly or by means of an intermediate striker, on the front end of a tool received in a tool receptacle, the one-piece flying piston and / or the striker being made of a non-ferromagnetic material in the form of Plastic exists.
- the object is to realize a striking mechanism for use in the environment of strong magnetic fields.
- an impact mechanism has a reciprocating air piston reciprocated by an air spring which strikes, directly or by means of an intermediate striker, the front end of a striking tool received in a tool receptacle, the one-piece flying piston and / or the striker being of non-ferromagnetic, advantageously hardenable material.
- the one-piece design of the flying piston and / or anvil made of a non-ferromagnetic material allows full life of the full functionality of the percussion even in the environment of strong magnetic fields, as practical experiments showed.
- the material is similar mass-dense and / or tough as steel, for example.
- both the striker and the flying piston of a non-ferromagnetic material whereby a magnetically effected sticking is further suppressed.
- the flying piston is guided in a guided in a guide tube, which further advantageously made of a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically caused sticking to the guide tube is suppressed.
- a guide tube which further advantageously made of a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically caused sticking to the guide tube is suppressed.
- a hand tool on such impact mechanism whereby this is used in environments with strong, especially static, magnetic fields.
- a common power hand tool in the form of an at least partially striking Combi hammer has a guided in a guide tube made of a magnesium-aluminum alloy, reciprocated by an air spring and flying piston, which encounters an anvil, on the front end of a recorded in a tool holder impact tool like a chisel hits.
- the same geometry and technologically largely identically manufacturable flying piston and striker consists instead of ferromagnetic steel from a non-ferromagnetic chromium-nickel-steel alloy, especially from V4A.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
Die Erfindung bezeichnet ein pneumatisches Schlagwerk mit einem durch eine Luftfeder hin- und herbewegten Flugkolben, vorzugsweise zum Einsatz in zumindest teilweise schlagenden Handwerkzeugmaschinen.The invention refers to a pneumatic percussion mechanism with a reciprocating air piston reciprocated by an air spring, preferably for use in at least partially striking hand-held 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 of a hand tool machine has a reciprocating piston which is reciprocated in a guide tube by an air spring and strikes an anvil and the front end of a tool accommodated in a tool holder. The flying piston and the striker are usually made of steel, whereby 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 Aluminiumschmeizanlagen 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.In special application of hand tool machines in environments with strong, especially static, magnetic fields, as they occur, for example, in the vicinity of Aluminiumschmeizanlagen, consists in a striking mechanism with conventional flying pistons and / or doublers of magnetizable material such as steel mediated by a strong, the percussion enforcing, Magnetic field, the possibility of magnetically caused sticking of the flying piston, especially in its rest position, whereby the purposive use of the hammer mechanism 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 of a power hand tool a reciprocating in a guide tube by an air spring piston blade made 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 US Pat. No. 3,144,421 and US Pat. No. 4,606,689, the flying piston in the impact contact region has a cylindrical insert made of another, shock-resistant material. According to US4602689, the non-impact-stressed inner core of the flying piston also consists of a metal heavier with respect to steel. Such multi-part flying pistons have a reduced lifetime due to the impact damage of the separating surfaces and are also technologically complicated to manufacture.
Die US3402776 offenbart ein Schlagwerk mit einem hin- und herbewegten Flugkolben, welche direkt oder mittels eines zwischengeordneten Döppers auf das Stirnende eines in einer Werkzeugaufnahme aufgenommenen Werkzeugs schlägt, wobei der aus einem Stück gefertigte Flugkolben und/oder der Döpper aus einem nichtferromagnetischem Material in Form von Plastik besteht.The US3402776 discloses a percussion mechanism with a reciprocating flying piston which strikes, directly or by means of an intermediate striker, on the front end of a tool received in a tool receptacle, the one-piece flying piston and / or the striker being made of a non-ferromagnetic material in the form of Plastic exists.
Die Aufgabe besteht in der Realisierung eines Schlagwerks zur Nutzung in der Umgebung starker Magnetfelder.The object is to realize a striking mechanism for use in the environment of strong magnetic fields.
Die Aufgabe wird im wesentlichen durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claim. 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, an impact mechanism has a reciprocating air piston reciprocated by an air spring which strikes, directly or by means of an intermediate striker, the front end of a striking tool received in a tool receptacle, the one-piece flying piston and / or the striker being of non-ferromagnetic, advantageously hardenable 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 design of the flying piston and / or anvil made of a non-ferromagnetic material allows full life of the full functionality of the percussion even in the environment of strong magnetic fields, as practical experiments showed.
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 both in a complete or local magnetization of these interconnected components, which is supported by the impact stress, as well as in the attraction of divergent magnetic field components on the outer contours of this, strongly permeated by the magnetic flux, ferromagnetic components. By contrast, the forces acting on a paramagnic component alone would be negligibly small. Thus, the cause of the sticking should be eliminated by at least one non-ferromagnetic component.
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, for example. A non-ferromagnetic steel alloy bzpw as a conventional chromium-nickel-iron alloy. V2A or V4A or a hardenable alloy such as X90CrMoV18, whereby an impact mechanism dynamics dimensioned for components made of steel is unchanged, 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 of a non-ferromagnetic material, whereby a magnetically effected sticking is further 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 guided in a guide tube, which further advantageously made of a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically caused 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 impact mechanism, whereby this is used in environments with strong, especially static, magnetic fields.
Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels nachfolgend näher erläutert.The invention will be explained in more detail below with reference to an advantageous embodiment.
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 striking Combi hammer has a guided in a guide tube made of a magnesium-aluminum alloy, reciprocated by an air spring and flying piston, which encounters an anvil, on the front end of a recorded in a tool holder impact tool like a chisel hits. However, compared to the usual standard series of electric hand tool machine the same geometry and technologically largely identically manufacturable flying piston and striker consists instead of ferromagnetic steel from a non-ferromagnetic chromium-nickel-steel alloy, especially from V4A.
Claims (7)
- Percussive system having a reciprocating flying piston which, directly or by means of an intermediately positioned snap die, strikes against the end face of a tool held in a tool locator, the flying piston being produced from a single piece, and it and/or the snap die being made from a non-ferromagnetic material, characterised in that the material has the density and/or toughness of steel.
- Percussive system according to claim 1, characterised in that the material is a non-ferromagnetic, optionally hardenable, alloy of steel.
- Percussive system according to either one of claims 1 and 2, characterised in that both the snap die and the flying piston are made from a non-ferromagnetic material.
- Percussive system according to any one of claims 1 to 3, characterised in that the flying piston is set in a sleeve.
- Percussive system according to claim 4, characterised in that the sleeve is made from a non-ferromagnetic material.
- Percussive system according to claim 5, characterised in that the sleeve is made from a diamagnetic material.
- Manual machine tool, characterised by the incorporation of a percussive system as claimed in any one of the preceding claims.
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 EP1352718A1 (en) | 2003-10-15 |
| EP1352718B1 true EP1352718B1 (en) | 2006-03-29 |
Family
ID=28051253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03405216A Expired - Lifetime EP1352718B1 (en) | 2002-04-11 | 2003-04-01 | Pneumatic percussive system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20040000414A1 (en) |
| EP (1) | EP1352718B1 (en) |
| JP (1) | JP2003311650A (en) |
| CN (1) | CN1449898A (en) |
| DE (2) | DE10216051A1 (en) |
Families Citing this family (6)
| 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 |
| EP3697574A1 (en) | 2017-10-20 | 2020-08-26 | Milwaukee Electric Tool Corporation | Percussion tool |
| US11059155B2 (en) | 2018-01-26 | 2021-07-13 | Milwaukee Electric Tool Corporation | Percussion tool |
Family Cites Families (7)
| 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 |
| 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 |
| JP3292969B2 (en) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | Hammer drill |
| 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 |
-
2002
- 2002-04-11 DE DE10216051A patent/DE10216051A1/en not_active Withdrawn
-
2003
- 2003-04-01 EP EP03405216A patent/EP1352718B1/en not_active Expired - Lifetime
- 2003-04-01 DE DE50302805T patent/DE50302805D1/en not_active Expired - Lifetime
- 2003-04-08 CN CN03109516.XA patent/CN1449898A/en active Pending
- 2003-04-10 US US10/411,165 patent/US20040000414A1/en not_active Abandoned
- 2003-04-10 JP JP2003106908A patent/JP2003311650A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20040000414A1 (en) | 2004-01-01 |
| CN1449898A (en) | 2003-10-22 |
| JP2003311650A (en) | 2003-11-05 |
| DE10216051A1 (en) | 2003-10-23 |
| DE50302805D1 (en) | 2006-05-18 |
| EP1352718A1 (en) | 2003-10-15 |
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