EP1422029B1 - Vibration decoupled percussion mechanism assembly - Google Patents

Vibration decoupled percussion mechanism assembly Download PDF

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Publication number
EP1422029B1
EP1422029B1 EP03104220A EP03104220A EP1422029B1 EP 1422029 B1 EP1422029 B1 EP 1422029B1 EP 03104220 A EP03104220 A EP 03104220A EP 03104220 A EP03104220 A EP 03104220A EP 1422029 B1 EP1422029 B1 EP 1422029B1
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EP
European Patent Office
Prior art keywords
mechanism assembly
percussion mechanism
housing
articulated arms
axial direction
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
Application number
EP03104220A
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German (de)
French (fr)
Other versions
EP1422029A1 (en
Inventor
Christian Daubner
Hubert Daxenberger
Erwin Manschitz
Ralf Neuhäuser
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Hilti AG
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Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1422029A1 publication Critical patent/EP1422029A1/en
Application granted granted Critical
Publication of EP1422029B1 publication Critical patent/EP1422029B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs

Definitions

  • the invention relates to an axially impacting power tool with a housing with respect to a vibration-decoupled axially Schlagtechniksbauou, in particular a hand-held chisel hammer, as from DE 201 09 122 U1 known and described in the preamble of claim 1.
  • EP837756 is in an axially striking hand tool a Schlagwerksbauffle against the housing exclusively biased by a parallelogram joint of leaf springs out.
  • the leaf springs which are necessary for limiting the axial position of the impact mechanism subassembly in the case of different spatial working orientations in space transmit strong vibration excitations to different points of the housing, whereby disturbing additional transverse vibration moments are induced.
  • WO 02/083369 A1 describes another hand tool with two parallel leaf springs.
  • US5025870 has an axially striking hand tool with an axially vibration-decoupled housing a parallelogram of two axially spaced, axially limited in plain bearings mosschwenkbaren articulated arms and an obliquely biased against a center of oscillation in the housing coil pressure spring, whereby transverse vibration moments are avoided. Due to the usual high level of dust in punching machine tools slide bearings have a high wear.
  • the object of the invention is to realize a low-wear vibration-decoupled striking mechanism assembly of an axially striking hand tool.
  • an at least partially axially impacting hand tool with a percussion unit has a spring biased against exactly one point in the housing for vibration isolation and, consisting of at least two axially spaced and axially limited movable articulated existing Axial arrangementskar for supporting the percussion unit, the articulated arms deformable limp trained and connected without sliding movement both with the housing and with the percussion unit.
  • At least one articulated arm on a rigid center portion and two end-side, elastically deformable foil joints which at the same time a rigid training in the transverse directions is achieved in a pliable training in the direction of vibration, which firmly lead the percussion mechanism in this regard.
  • two axially spaced articulated arms are oriented parallel to each other, whereby a tension-free parallelogram is formed.
  • the middle section has additional stiffeners, whereby in particular acoustically disturbing parasitic bending modes and torsional vibrations along the articulated arm are prevented.
  • At least two articulated arms are oriented in opposite directions with respect to their radial extension, whereby at least one articulated arm is loaded by the weight of Schlagtechniksbau devise along its radial extent and relieves the other articulated arm, whereby stability problems are reliably avoided by buckling along the articulated arm at different spatial orientations.
  • the spring is designed as a spiral compression spring, whereby a low-damping and space-saving spring with a suitable spring constant can be realized.
  • an axially striking hand tool 1 in the form of a chisel hammer with a percussion unit 2 has a prestressed against exactly one point P in the housing 3 spring 4 in the form of a helical compression spring and from exactly two axially spaced and axially limited movable articulated arms 5a, 5b existing , Axial Adjustskar for storage of the percussion unit 2 on.
  • the mutually parallel and with respect to their radial extent in opposite directions articulated arms 5a, 5b made of steel are formed axially slippery deformable.
  • the grip-side articulated arm 5a has a rigid center section with additional stiffeners 6 and two end-side, flat, elastically deformable foil joints 7.
  • the articulated arms 5a, 5b are connected both to the housing 3 via axially projecting fastening domes 8a, 8b and directly to the striking mechanism assembly 2, which consists of an electric motor 9, a gear 10 and a pneumatic impact mechanism 11, without sliding movement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Mechanical Operated Clutches (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Surgical Instruments (AREA)

Abstract

The portable electric hammer drill (1) has a hammer component group (2) which is separated accurately from a grip point (P) at the tool housing (3) by a coil spring (4), to disengage vibrations. The hammer group is also mounted on at least two axially displaced joint arms (5a,5b) with axially defined movements. The joint arms have a bending distortion, and are fixed to the housing without allowing a sliding movement. At least one arm has a center section with a bending stiffness, and two film joints (7) at the ends with an elastic distortion.

Description

Die Erfindung bezeichnet eine axial schlagende Handwerkzeugmaschine mit einer gegenüber einem Gehäuse axial vibrationsentkoppelten Schlagwerksbaugruppe, insbesondere eines handgeführten Meisselhammers, wie aus der DE 201 09 122 U1 bekannt und im Oberbegriff des Anspruch 1 beschrieben.The invention relates to an axially impacting power tool with a housing with respect to a vibration-decoupled axially Schlagwerksbaugruppe, in particular a hand-held chisel hammer, as from DE 201 09 122 U1 known and described in the preamble of claim 1.

Bei handgeführten, axial schlagenden Handwerkzeugmaschinen ist eine hinreichende Entkopplung der axialen Schlagbeanspruchung notwendig. Insbesondere Handwerkzeugmaschinen höherer Leistungsklassen höher 1000 W weisen Schlagwerke auf, die trägheitsbedingt eine Axialschlagbewegung im Bereich einiger mm aufweisen, wobei bedingt durch unterschiedliche räumliche Arbeitsorientierungen im Raum durch die Schwerkraft unterschiedliche Vorspannungen des Schlagwerks zum Gehäuse notwendig sind.In hand-held, axially impacting hand tool a sufficient decoupling of the axial impact load is necessary. In particular, hand tools higher performance classes higher 1000 W have striking mechanisms, the inertia have a Axialschlagbewegung in the range of a few mm, which due to different spatial working orientations in space by gravity different biases of the impact mechanism to the housing are necessary.

Nach der EP837756 ist bei einer axial schlagenden Handwerkzeugmaschine eine Schlagwerksbaugruppe gegen das Gehäuse ausschliesslich über ein biegefederndes Parallelogrammgelenk aus Blattfedern vorgespannt geführt. Die zur Begrenzung der axialen Position der Schlagwerksbaugruppe bei unterschiedlichen räumlichen Arbeitsorientierungen im Raum notwendig kräftigen Blattfedern übertragen starke Schwingungsanregungen an verschiedene Punkte des Gehäuses, wodurch störende zusätzliche Querschwingungsmomente induziert werden. WO 02/083369 A1 beschreibt eine weitere Handwerkzeugmaschine mit zwei parallel angeordneten Blattfedern.After EP837756 is in an axially striking hand tool a Schlagwerksbaugruppe against the housing exclusively biased by a parallelogram joint of leaf springs out. The leaf springs which are necessary for limiting the axial position of the impact mechanism subassembly in the case of different spatial working orientations in space transmit strong vibration excitations to different points of the housing, whereby disturbing additional transverse vibration moments are induced. WO 02/083369 A1 describes another hand tool with two parallel leaf springs.

Nach der DE2820125 ist ein Schlagwerk gegen das Gehäuse mit einer axial angeordneten Spiraldruckfeder abgestützt. Nach der DE3405922 ist eine über Gummiringe geringfügig axial beweglich geführte Schlagwerksbaugruppe gegen das Gehäuse mit einer axial angeordneten Spiraldruckfeder abgestützt. Derartige Lösungen weisen einen zu kleinen axialen Lagerbereich auf.After DE2820125 a striking mechanism is supported against the housing with an axially disposed helical compression spring. After DE3405922 is a rubber rings slightly axially movable guided percussion device supported against the housing with an axially disposed coil spring. Such solutions have too small an axial bearing area.

Nach der US5025870 weist eine axial schlagende Handwerkzeugmaschine mit einem axial vibrationsentkoppelten Gehäuse ein Parallelogrammgelenk aus zwei axial beabstandeten, in Gleitlagern axial begrenzt drehschwenkbaren Gelenkarmen und eine schräg gegen einen Schwingungsmittelpunkt im Gehäuse vorgespannte Spiraldruckfeder auf, wodurch Querschwingungsmomente vermieden werden. Durch die bei Schlagwerkzeugmaschinen übliche hohe Staubbelastung weisen Gleitlager einen hohen Verschleiss auf.After US5025870 has an axially striking hand tool with an axially vibration-decoupled housing a parallelogram of two axially spaced, axially limited in plain bearings drehschwenkbaren articulated arms and an obliquely biased against a center of oscillation in the housing coil pressure spring, whereby transverse vibration moments are avoided. Due to the usual high level of dust in punching machine tools slide bearings have a high wear.

Die Aufgabe der Erfindung besteht in der Realisierung einer verschleissarm vibrationsentkoppelten Schlagwerksbaugruppe einer axial schlagenden Handwerkzeugmaschine.The object of the invention is to realize a low-wear vibration-decoupled striking mechanism assembly of an axially striking hand tool.

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 eine zumindest teilweise axial schlagende Handwerkzeugmaschine mit einer Schlagwerksbaugruppe eine gegen genau einen Angriffspunkt im Gehäuse vorgespannte Feder zur Schwingungsentkopplung sowie ein, aus zumindest zwei axial beabstandeten und axial begrenzt beweglichen Gelenkarmen bestehendes, Axialführungsmittel zur Lagerung der Schlagwerksbaugruppe auf, wobei die Gelenkarme biegeschlaff deformierbar ausgebildet und sowohl mit dem Gehäuse als auch mit der Schlagwerksbaugruppe gleitbewegungsfrei verbunden sind.Essentially, an at least partially axially impacting hand tool with a percussion unit has a spring biased against exactly one point in the housing for vibration isolation and, consisting of at least two axially spaced and axially limited movable articulated existing Axialführungsmittel for supporting the percussion unit, the articulated arms deformable limp trained and connected without sliding movement both with the housing and with the percussion unit.

Durch die biegeschlaff deformierbar ausgebildete Lagerung der Schlagwerksbaugruppe werden bei hinreichend grosser axialer Beweglichkeit von ca. 10 mm, welche bei unterschiedlichen Orientierungen der Handwerkzeugmaschine zu notwendig verschiedenen Vorspannungen der Schlagwerksbaugruppe führt, bei einer gleitbewegungsfreien und somit verschleissarmen Führung störende Querschwingungsmomente vermieden.Due to the slippery deformable trained mounting of the percussion unit are at sufficiently large axial mobility of about 10 mm, which leads to different orientations of the power tool to necessary different biases of Schlagwerksbaugruppe, avoided in a slipping motion and thus low-wear guide disturbing transverse vibration moments.

Erfindungsgemäß weist zumindest ein Gelenkarm einen biegesteifen Mittenabschnitt und zwei endseitige, elastisch deformierbare Foliengelenke auf, wodurch bei einer biegeschlaffen Ausbildung in Schwingungsrichtung gleichzeitig eine biegesteife Ausbildung in den Querrichtungen erzielt ist, welche die Schlagwerksbaugruppe diesbezüglich fest führen.According to the invention, at least one articulated arm on a rigid center portion and two end-side, elastically deformable foil joints, which at the same time a rigid training in the transverse directions is achieved in a pliable training in the direction of vibration, which firmly lead the percussion mechanism in this regard.

Vorteilhaft sind jeweils zwei axial beabstandete Gelenkarme zueinander parallel orientiert, wodurch eine verspannungsfreie Parallelogrammführung ausgebildet wird.Advantageously, two axially spaced articulated arms are oriented parallel to each other, whereby a tension-free parallelogram is formed.

Vorteilhaft weist der Mittenabschnitt zusätzliche Versteifungen auf, wodurch insbesondere akustisch störende parasitäre Biegemoden und Torsionsschwingungen längs des Gelenkarms unterbunden werden.Advantageously, the middle section has additional stiffeners, whereby in particular acoustically disturbing parasitic bending modes and torsional vibrations along the articulated arm are prevented.

Vorteilhaft sind zumindest zwei Gelenkarme bezüglich ihrer radialen Erstreckung gegensinnig orientiert, wodurch bei unterschiedlichen Raumorientierungen der Handwerkzeugmaschine zumindest ein Gelenkarm durch das Gewicht der Schlagwerksbaugruppe längs seiner radialen Erstreckung zugbeansprucht ist und den jeweils andere Gelenkarm entlastet, wodurch Stabilitätsprobleme durch Knicken längs des Gelenkarms sicher vermieden werden. Vorteilhaft ist die Feder als Spiraldruckfeder ausgebildet, wodurch eine dämpfungsarme und raumsparende Feder mit geeigneter Federkonstante realisierbar ist.Advantageously, at least two articulated arms are oriented in opposite directions with respect to their radial extension, whereby at least one articulated arm is loaded by the weight of Schlagwerksbaugruppe along its radial extent and relieves the other articulated arm, whereby stability problems are reliably avoided by buckling along the articulated arm at different spatial orientations. Advantageously, the spring is designed as a spiral compression spring, whereby a low-damping and space-saving spring with a suitable spring constant can be realized.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit einer teilweisen Schnittdarstellung einer Handwerkzeugmaschine.The invention will be explained with reference to an advantageous embodiment with a partial sectional view of a hand tool.

Nach der Darstellung weist eine axial schlagende Handwerkzeugmaschine 1 in Form eines Meisselhammers mit einer Schlagwerksbaugruppe 2 eine gegen genau einen Angriffspunkt P im Gehäuse 3 vorgespannte Feder 4 in Form einer Schraubendruckfeder sowie ein, aus genau zwei axial beabstandeten und axial begrenzt beweglichen Gelenkarmen 5a, 5b bestehendes, Axialführungsmittel zur Lagerung der Schlagwerksbaugruppe 2 auf. Die zueinander parallel sowie bezüglich ihrer radialen Erstreckung gegensinnig orientierten Gelenkarme 5a, 5b aus Stahl sind axial biegeschlaff deformierbar ausgebildet. Der griffseitige Gelenkarm 5a weist einen biegesteifen Mittenabschnitt mit zusätzlichen Versteifungen 6 und zwei endseitige, flache, elastisch deformierbare Foliengelenke 7 auf. Die Gelenkarme 5a, 5b sind sowohl mit dem Gehäuse 3 über axial auskragende Befestigungsdome 8a, 8b als auch direkt mit der Schlagwerksbaugruppe 2, welche aus einem Elektromotor 9, einem Getriebe 10 und einem pneumatischen Schlagwerk 11 besteht, gleitbewegungsfrei verbunden. As shown, an axially striking hand tool 1 in the form of a chisel hammer with a percussion unit 2 has a prestressed against exactly one point P in the housing 3 spring 4 in the form of a helical compression spring and from exactly two axially spaced and axially limited movable articulated arms 5a, 5b existing , Axialführungsmittel for storage of the percussion unit 2 on. The mutually parallel and with respect to their radial extent in opposite directions articulated arms 5a, 5b made of steel are formed axially slippery deformable. The grip-side articulated arm 5a has a rigid center section with additional stiffeners 6 and two end-side, flat, elastically deformable foil joints 7. The articulated arms 5a, 5b are connected both to the housing 3 via axially projecting fastening domes 8a, 8b and directly to the striking mechanism assembly 2, which consists of an electric motor 9, a gear 10 and a pneumatic impact mechanism 11, without sliding movement.

Claims (5)

  1. A percussion mechanism assembly for a hand-held power tool (1) for at least sometimes generating a percussive action in axial direction, said percussion mechanism assembly being decoupled from vibration precisely at a point of engagement (P) in the housing (3) via a spring (4), as well as being supported by axial guide means consisting of at least two articulated arms (5a, 5b) spaced apart from one another in axial direction and capable of limited displacement in axial direction, characterized in that the articulated arms (5a, 5b) are formed so as to be flexurally deformable and are attached to the housing (3) so as to be free of any slipping movement, at least one articulated arm (5a) having a middle portion which is resistant to bending and two elastically deformable foil end portions (7).
  2. A percussion mechanism assembly according to Claim 1, characterized in that in each case two articulated arms (5a, 5b) spaced apart from one another in axial direction are oriented parallel to one another.
  3. A percussion mechanism assembly according to Claim 1, characterized in that the middle portion has additional reinforcing means (6).
  4. A percussion mechanism assembly according to one of the preceding claims, characterized in that at least two articulated arms (5a, 5b) are oriented in opposite directions in terms of their radial extension.
  5. A percussion mechanism assembly according to one of the preceding claims, characterized in that the spring (4) takes the form of a helical compression spring.
EP03104220A 2002-11-22 2003-11-17 Vibration decoupled percussion mechanism assembly Expired - Lifetime EP1422029B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255162A DE10255162A1 (en) 2002-11-22 2002-11-22 Vibration-decoupled hammer mechanism assembly
DE10255162 2002-11-22

Publications (2)

Publication Number Publication Date
EP1422029A1 EP1422029A1 (en) 2004-05-26
EP1422029B1 true EP1422029B1 (en) 2010-11-17

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EP03104220A Expired - Lifetime EP1422029B1 (en) 2002-11-22 2003-11-17 Vibration decoupled percussion mechanism assembly

Country Status (7)

Country Link
US (1) US6962211B2 (en)
EP (1) EP1422029B1 (en)
JP (1) JP4344223B2 (en)
CN (1) CN100335239C (en)
AT (1) ATE488332T1 (en)
DE (2) DE10255162A1 (en)
PL (1) PL363594A1 (en)

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Publication number Publication date
PL363594A1 (en) 2004-05-31
DE50313264D1 (en) 2010-12-30
US20040154813A1 (en) 2004-08-12
ATE488332T1 (en) 2010-12-15
US6962211B2 (en) 2005-11-08
CN100335239C (en) 2007-09-05
DE10255162A1 (en) 2004-06-03
CN1502451A (en) 2004-06-09
JP4344223B2 (en) 2009-10-14
EP1422029A1 (en) 2004-05-26
JP2004174707A (en) 2004-06-24

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