EP1340596B1 - Pneumatic percussion mechanism - Google Patents

Pneumatic percussion mechanism Download PDF

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Publication number
EP1340596B1
EP1340596B1 EP03405098A EP03405098A EP1340596B1 EP 1340596 B1 EP1340596 B1 EP 1340596B1 EP 03405098 A EP03405098 A EP 03405098A EP 03405098 A EP03405098 A EP 03405098A EP 1340596 B1 EP1340596 B1 EP 1340596B1
Authority
EP
European Patent Office
Prior art keywords
dolly
free piston
pot
radial clearance
striker
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.)
Not-in-force
Application number
EP03405098A
Other languages
German (de)
French (fr)
Other versions
EP1340596A1 (en
Inventor
Josef Fünfer
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
Priority to DE10209293A priority Critical patent/DE10209293A1/en
Priority to DE10209293 priority
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1340596A1 publication Critical patent/EP1340596A1/en
Application granted granted Critical
Publication of EP1340596B1 publication Critical patent/EP1340596B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24Damping the reaction force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D11/00Portable percussive tools with electromotor or other motor drive
    • B25D11/005Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • B25D2217/0015Anvils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131Idling mode of tools

Description

Die Erfindung bezeichnet ein pneumatisches Schlagwerk für eine zumindest teilweise schlagende Handwerkzeugmaschine wie einen Meisselhammer oder einen Bohrhammer.The invention refers to a pneumatic impact mechanism for an at least partially striking hand tool such as a chisel hammer or a hammer drill.

Ein pneumatisches Schlagwerk weist einen in einem Führungsrohr geführten sowie durch eine Luftfeder angetriebenen Flugkolben auf, welcher üblicherweise auf einen begrenzt axial beweglichen Döpper schlägt, der selbst auf das Stirnende eines begrenzt axial beweglichen Werkzeugs trifft.A pneumatic percussion mechanism has a guided in a guide tube and driven by an air spring air piston, which usually strikes a limited axially movable striker, which hits even the front end of a limited axially movable tool.

Die DE 2 702 128 offenbart ein Schlagwerk gemäß dem Oberbegriff des Anspruchs 1 und betrifft daher den nächstliegenden Stand der Technik.The DE 2 702 128 discloses a striking mechanism according to the preamble of claim 1 and therefore relates to the closest prior art.

Nach der DE2702128 weist ein, für einen Bohrhammer möglichst kurz ausgeführtes, pneumatisches Schlagwerk einen topfförmig ausgebildeten Flugkolben auf, in welchen radial innen ein Döpper eindringt. Weitere döpperseitig topfförmig hohl ausgebildete Flugkolben sind nach der JP8141937 und JP7328955 vorbekannt.After DE2702128 has a pneumatic impact mechanism as short as possible executed for a hammer, a cup-shaped flying pistons, in which radially inwardly an anvil penetrates. More on the doppelfopf pot-shaped hollow formed air piston are after the JP8141937 and JP7328955 previously known.

Bei pneumatischen Schlagwerken tritt unter gewissen Arbeitsbedingungen wie fehlender Gegendruck vom Werkstück ein Nachschlagen des Döppers auf das Werkzeug auf, welches nach der DE3804026 über Luftdurchlässe im Flugkolben und einem drehversetzbaren Führungsrohr unterbunden wird.In pneumatic striking mechanisms occurs under certain working conditions such as lack of back pressure from the workpiece a lookup of the bonnet on the tool, which after the DE3804026 via air outlets in the air piston and a drehversetzbaren guide tube is prevented.

Die Aufgabe der Erfindung besteht in der technologisch einfachen Realisierung eines nachschlagfreien pneumatischen Schlagwerkes kurzer Bauform.The object of the invention consists in the technologically simple realization of a non-impact pneumatic impact mechanism short design.

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 pneumatisches Schlagwerk für eine zumindest teilweise schlagende Handwerkzeugmaschine einen topfförmigen Flugkolben auf, in dessen Topfraum radial innen ein Döpper innerhalb einer axialen Eindringlänge beweglich eindringt und mit diesem einen dämpfenden, pneumatisch wirksamen Radialspalt zum im wesentlichen gasdicht geschlossenen Topfraum ausbildet, welcher den durch den Flugkolben axial angetriebenen Döpper innerhalb der Eindringlänge zur Bewegungsumkehr zwingt.In essence, a pneumatic percussion for an at least partially striking hand tool on a pot-shaped flying pistons, in the pot chamber radially inside a striker inside an axial penetration length penetrates and forms with this a damping, pneumatically active radial gap to substantially gas-tight closed pot space, which the through forcing the air piston axially driven striker within the penetration length to reverse the movement.

Durch den auf Grund des hohen Strömungswiderstandes zum Topfraum dämpfenden, pneumatisch wirksamen Radialspalt ist nach dem Stossimpuls des Flugkolbens auf den Döpper eine Saugwirkung zwischen dem im wesentlichen gasdicht geschlossenen Topfraum des Flugkolbens und dem Döpper vorhanden, wodurch im Arbeitspunkt zwar keine wesentliche Abbremsung des Döppers erfolgt, dieser jedoch im Leerschlagfall vor dem Auftreffen auf das Stirnende des Werkzeuges seine Bewegungsrichtung umkehrt, wodurch bei hinreichender Bohrleistung ein optimales Nachschlagverhalten erzielt wird.Due to the due to the high flow resistance to the pot chamber damping, pneumatically active radial gap after the shock pulse of the flying piston on the striker suction between the substantially gas-tight closed pot chamber of the flying piston and the striker exist, whereby at the operating point, although no significant deceleration of the striker takes place However, this reverses its direction of movement before striking the front end of the tool in the case of no-load, whereby an adequate Nachschlagverhalten is achieved with sufficient drilling performance.

Vorteilhaft beträgt die vom radialen Ringspalt zwischen dem Döpper und dem Flugkolben gebildete Spaltfläche 3% bis 6% des durch den Döpper innerhalb des Flugkolbens gebildeten Döpperquerschnitts wodurch bei den üblichen Schlagfrequenzen von 50Hz bis 100Hz innerhalb von 10mm eine Bewegungsumkehr erfolgt.Advantageously, the gap surface formed by the radial annular gap between the striker and the flying piston is 3% to 6% of the striker formed by the striker within the flying piston whereby a reversal of motion occurs at the usual flapping frequencies of 50Hz to 100Hz within 10mm.

Vorteilhaft ist bei üblichen pneumatischen Schlagwerken für Handwerkzeugmaschinen mit einem in den Flugkolben eindringenden ca. 50g (0,050 kg) wiegenden Döpper und einem pneumatisch wirksamen Durchmesser von ca. 10mm die Spaltdicke 0,1mm bis 0,17mm, wodurch sich in Versuchsserien optimale Ergebnisse erzielen liessen.The gap thickness is 0.1 mm to 0.17 mm in conventional pneumatic percussion devices for handheld power tools with an approximately 50 g (0.050 kg) weighing striker and a pneumatically effective diameter of approx. 10 mm, which results in optimum results in test series ,

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als pneumatisches Schlagwerk
  • Fig. 2 als Einzelheit II, gemäss Ausschnitt, vergrössert, aus Fig. 1
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 as a pneumatic impact mechanism
  • Fig. 2 as detail II, according to section, enlarged, from Fig. 1

Nach Fig. 1 weist ein im Leerschlagfall am Bewegungsumkehrpunkt dargestelltes pneumatisches Schlagwerk einer nur teilweise dargestellten schlagenden Handwerkzeugmaschine 1 einen topfförmigen Flugkolben 2 auf, in welchen radial innen ein Döpper 3 innerhalb einer werkzeugseitig axialen Eindringlänge L beweglich eindringt, der über einen Teil seiner Aussenmantelfläche mit einem Teil der Innenmantelfläche des Flugkolbens 2 einen dämpfenden, pneumatisch wirksamen Radialspalt X zu einem im wesentlichen gasdicht geschlossenen Topfraum 4 ausbildet.To Fig. 1 a pneumatic percussion mechanism of a hand-held power tool 1, only partially shown, has a cup-shaped flying piston 2, in which radially inside a striker 3 movably penetrates within a tool-axial penetration length L, which over part of its outer circumferential surface with a part of the inner surface of the Aero-piston 2 forms a damping, pneumatically active radial gap X to a substantially gas-tight closed pot chamber 4.

Nach Fig. 2 beträgt bei einem pneumatisch wirksamen Durchmesser D des Döppers 3 von ca. 10mm die Dicke des dämpfenden, radialen Radialspalts X zwischen 0,1mm bis 0,17mm.To Fig. 2 is at a pneumatically effective diameter D of the striker 3 of about 10mm, the thickness of the damping, radial radial gap X between 0.1 mm to 0.17 mm.

Claims (3)

  1. Pneumatic hammer mechanism for a power hand tool (1) possessing a hammer function, with a pot-shaped free piston (2) which is driven by an air spring and into whose pot chamber (4) a dolly (3) penetrates radially inwards and movably within an axial penetration length (L), characterized in that the dolly (3) forms with the pot-shaped free piston (2) a damping radial clearance (X) leading to the substantially gastightly closed pot chamber (4) which compels the dolly (3) axially driven by the free piston (2) to reverse direction within the penetration length (L).
  2. Pneumatic hammer mechanism according to Claim 1, characterized in that the gap area formed by the radial clearance (X) between the dolly (3) and the free piston (2) represents 3% to 6% of the cross-section occupied by the dolly (3) inside the free piston (2).
  3. Pneumatic hammer mechanism according to Claim 1 or Claim 2, characterized in that the thickness of the radial clearance (X) is between 0.1 mm and 0.17 mm.
EP03405098A 2002-03-01 2003-02-19 Pneumatic percussion mechanism Not-in-force EP1340596B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10209293A DE10209293A1 (en) 2002-03-01 2002-03-01 Pneumatic striking mechanism
DE10209293 2002-03-01

Publications (2)

Publication Number Publication Date
EP1340596A1 EP1340596A1 (en) 2003-09-03
EP1340596B1 true EP1340596B1 (en) 2010-02-03

Family

ID=27675174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405098A Not-in-force EP1340596B1 (en) 2002-03-01 2003-02-19 Pneumatic percussion mechanism

Country Status (5)

Country Link
US (1) US20030221847A1 (en)
EP (1) EP1340596B1 (en)
JP (1) JP4340081B2 (en)
CN (1) CN1442276A (en)
DE (2) DE10209293A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030340B3 (en) * 2005-06-29 2007-01-04 Wacker Construction Equipment Ag Impact mechanism with electrodynamic linear drive
US7726413B2 (en) 2006-07-01 2010-06-01 Black & Decker Inc. Tool holder for a powered hammer
EP1872910B1 (en) 2006-07-01 2012-11-21 Black & Decker, Inc. Method for mesuring the amount of wear of a nose of beat piece in a hammer drill
US7413026B2 (en) 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
DE102006000395A1 (en) * 2006-08-07 2008-02-14 Hilti Ag Hand tool with pneumatic percussion
SE531658C2 (en) * 2006-10-02 2009-06-23 Atlas Copco Rock Drills Ab Percussion along with rock drill and rock drill rig
DE102006060320A1 (en) 2006-12-20 2008-06-26 Robert Bosch Gmbh Schlagwerk for a hand tool
US9216502B2 (en) 2008-04-03 2015-12-22 Black & Decker Inc. Multi-stranded return spring for fastening tool
US8534527B2 (en) 2008-04-03 2013-09-17 Black & Decker Inc. Cordless framing nailer
DE102011078628A1 (en) * 2011-07-05 2013-01-10 Robert Bosch Gmbh chlagwerkvorrichtung
KR101412092B1 (en) * 2013-11-28 2014-07-02 주식회사 엔와이테크 Hydraulic punching apparatus of low noise type
WO2017199823A1 (en) * 2016-05-18 2017-11-23 株式会社マキタ Impact tool

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB173093A (en) * 1920-10-07 1921-12-29 Chicago Pneumatic Tool Co Improvements in power hammers
DE2702128C3 (en) * 1977-01-20 1981-01-22 Metabowerke Kg, Closs, Rauch & Schnizler, 7440 Nuertingen Motor-driven hammer in which a piston is slidably guided in a cylinder
DE2844086A1 (en) * 1978-10-10 1980-04-30 Bosch Gmbh Robert HAND MACHINE, IN PARTICULAR HAMMER
DE2844109A1 (en) * 1978-10-10 1980-04-24 Bosch Gmbh Robert HAND MACHINE, IN PARTICULAR DRILLING AND / OR HAMMER
DE2929191C2 (en) * 1979-07-19 1984-08-02 Metabowerke GmbH & Co, 7440 Nürtingen Electropneumatic hammer
US4462467A (en) * 1981-11-09 1984-07-31 Hilti Aktiengesellschaft Percussion drill machine
US4582144A (en) * 1984-04-25 1986-04-15 Makita Electric Works, Ltd. Percussive tools
DE3804026A1 (en) * 1987-12-21 1989-08-24 Bosch Gmbh Robert Power-driven chisel or drill hammer
JPH07328955A (en) * 1994-06-09 1995-12-19 Hitachi Koki Co Ltd Hammer drill
DE10032949A1 (en) * 2000-07-06 2002-01-17 Hilti Ag screwdriving

Also Published As

Publication number Publication date
JP2003266332A (en) 2003-09-24
CN1442276A (en) 2003-09-17
DE50312392D1 (en) 2010-03-25
DE10209293A1 (en) 2003-09-18
US20030221847A1 (en) 2003-12-04
JP4340081B2 (en) 2009-10-07
EP1340596A1 (en) 2003-09-03

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