EP3140081A1 - Machine-outil à main - Google Patents

Machine-outil à main

Info

Publication number
EP3140081A1
EP3140081A1 EP15713756.3A EP15713756A EP3140081A1 EP 3140081 A1 EP3140081 A1 EP 3140081A1 EP 15713756 A EP15713756 A EP 15713756A EP 3140081 A1 EP3140081 A1 EP 3140081A1
Authority
EP
European Patent Office
Prior art keywords
handle
working axis
machine
cavity
along
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
EP15713756.3A
Other languages
German (de)
English (en)
Other versions
EP3140081B1 (fr
Inventor
Axel Fischer
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 EP3140081A1 publication Critical patent/EP3140081A1/fr
Application granted granted Critical
Publication of EP3140081B1 publication Critical patent/EP3140081B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/69—Foamed polymers, e.g. polyurethane foam

Definitions

  • the present invention relates to a hand tool machine such as known from DE 102010040094 A1.
  • the hand tool has a tool holder for holding a tool on a working axis and a striking mechanism, which has a periodically moved back and forth on the working axis rackets.
  • the striking mechanism is mounted in a machine housing.
  • a handle is attached to the machine housing by means of a damper.
  • the damper has a machine-side surface connected to the machine housing and a handle-side surface connected to the handle. Adjacent to the machine side surface and the handle side surface is a block of porous elastomer. An air filled cavity is provided within the block between the machine side surface and the handle side surface.
  • the cavities within the porous elastomer cause an increasing stiffness of the damper as the user's pressure increases.
  • the rigidity can be easily adapted to a desired characteristic.
  • the cavities located in the block prove to be sufficiently robust under continuous load, especially against abrasion.
  • FIG. 1 shows a rotary hammer Fig. 2 section through a handle decoupling of the hammer drill in level II
  • FIG. 3 section through a handle decoupling a hammer drill in level II
  • Fig. 1 shows schematically, as an example of a chiseling hand tool, a hammer drill 1.
  • the hammer drill 1 has a tool holder 2 into which a shank end 3 of a tool, e.g. one of the drill 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7.
  • a battery pack 8 or a power line supplies the motor 5 with power.
  • a user can lead the hammer drill 1 by means of a handle 9 and take the hammer drill 1 by means of a system switch 10 in operation.
  • the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the percussion 6 is a pneumatic percussion 6.
  • An exciter piston 13 and a racket 14 are movably guided in a guide tube 15 in the striking mechanism 6 along the working axis 11.
  • the excitation piston 13 is coupled via an eccentric 16 to the motor 5 and forced to a periodic, linear movement.
  • a connecting rod 17 connects the eccentric 16 with the excitation piston 13.
  • An air spring formed by a pneumatic chamber 18 between the excitation piston 13 and the racket 14 couples a movement of the racket 14 to the movement of the exciter piston 13.
  • the racket 14 can strike directly on a rear end of the drill 4 or indirectly transmit a portion of its pulse to the drill 4 via a substantially resting intermediate racket 19.
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 20.
  • a recoil of the pneumatic impact mechanism 6 is transmitted to the handle 9 via the machine housing 20.
  • the handle 9 is suspended by a damper 21 on the machine housing 20 to reduce the peak load of the recoil.
  • the damper 21 is shown in a section in Fig. 2.
  • the damper 21 has a punch 22 which is rigidly secured to the handle 9.
  • the punch 22 is arranged in a cage 23 which is rigidly fixed to the machine housing 20.
  • the punch 22 is movable in the cage 23 along the working axis 11.
  • the stamp 22 has an in Impact direction 12 facing punch surface 24 which faces a counter to the direction of impact 12 facing stop surface 25 of the cage 23.
  • the two surfaces 24, 25 are preferably flat or, if bent, have the same curvature.
  • the punch surface 24 is substantially uniform over its entire surface to the stop surface 25 at a distance 26th
  • the damper 21 has a porous elastomer body 27 which is disposed between the punch 22 and the cage 23.
  • the porous elastomer body 27 transmits a force from the handle 9 to the machine housing 20 in the direction of impact 12.
  • the porous elastomer body 27 has a buffer section 28 which bears against the stamp face 24 and against the opposite stop face 25.
  • the dimensions of the buffer section 28 perpendicular to the working axis 11 are equal to the corresponding dimensions stamp face 24, which is connected here, for example, to the handle 9.
  • the outer surface of the porous elastomer body 27 pointing in the direction of impact 12 is flush and completely against the stop surface 25, at least in the buffer section 28.
  • the outer surface of the buffer section 28 pointing counter to the direction of impact 12 lies flush and completely against the stamp surface 24.
  • the porous elastomer body 27, in particular the buffer portion 28, is compressed when the user presses the handle 9 in the direction of impact 12.
  • the vibrations of the hammer drill 1 act on the porous elastomer body 27 in a dynamic manner.
  • the construction of the buffer portion 28 continuous with the punch surface 24 and the abutment surface 25 effectively prevents the buffer portion 28 from moving parallel to the punch surface 24 and the abutment surface 25 during the dynamic load changes.
  • porous elastomer body 27 in particular a rubber-free, open-pore elastomer body 27 which is preferred for damping.
  • the porous elastomer body 27 is preferably provided by an air gap 29 on its outer surfaces pointing perpendicularly to the working axis 11 surround.
  • the air gap 29 is sufficiently dimensioned so that the porous elastomeric body 27 does not touch the cage 23 or another housing laterally when compressed due to the contact pressure of the user.
  • the porous elastomer body 27 preferably has a prismatic structure.
  • the porous elastomer body 27 has a constant cross section (FIG. 2).
  • the porous elastomer body 27 can thus be cut out of a cuboid by means of a water jet saw.
  • the illustrated porous elastomer body 27 has, for example, two air-filled cavities 30.
  • the cavities 30 are arranged within the buffer section 28, ie between the stamp surface 24 and the stop surface 25.
  • the cavities 30 are within the buffer section 28 in the sense that they are not open to the stamp surface 24 or the stop surface 25.
  • the cavity 30 is closed along the working axis 11.
  • the cavity 30 may be open in a direction perpendicular to the working axis 11.
  • the exemplified cavities 30 have a cylindrical shape with an elliptical cross section that extends through the entire porous elastomer body 27.
  • the axes of the cavities 30 are hereby exemplarily parallel to the handle axis.
  • the largest dimension 31 of the cavity 30 along the working axis 11, here the smaller half-axis of the ellipse is between 20% and 50% of the distance 26 of the die surface 24 of the stop surface 25, so the axial outer dimension of the buffer portion 28.
  • the axial dimensions of the porous Elastomer body 27 are to be determined without external force on the damper 21, in particular without pressing force of the user on the handle 9.
  • the cavity 30 preferably has a constant cross-section along an axis.
  • the axis is perpendicular or inclined with respect to the working axis 11.
  • the cavity 30 is closed annularly in the cross section.
  • the cross-section has a dimension 31 along the working axis 11 and a dimension 34 perpendicular to the working axis 11.
  • the dimension 34 perpendicular to the working axis 11 is preferably at least twice as large as the dimension 31 along the working axis 11.
  • the opposite inner surfaces 32, 33 can touch, in particular the points originally along the working axis 11 farthest points, without causing cracking during the dynamic loads in the porous elastomer body 27.
  • Fig. 3 illustrates the elastomeric body 27 with differently shaped cavities 130.
  • the cavity 35 has a teardrop-shaped cross-section.
  • One of the cage 23 facing inner surface 36 and this opposite, the punch 22 facing inner surface 37th are essentially flat and converge to a peak.
  • the two inner surfaces 36, 37 are inclined relative to each other at an angle between 30 degrees and 90 degrees. Opposite the tip, the two flat inner surfaces 36, 37 are connected by a semi-cylindrical inner surface.
  • An axis of the drop shape ie from the tip to the half-cylinder, is perpendicular to the working axis 11.
  • a width 38 of the drop, ie its dimension 34 along the working axis 11, is preferably in the range between 20% and 50% of the distance 26 of the die surface 24 of the stop surface 25.
  • the length 39 of the drop, ie along its axis through the tip is greater than the width 38, preferably at least twice as large.

Landscapes

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

Abstract

L'invention concerne une machine-outil à main (1) qui comprend un porte-outil (2) servant à maintenir un outil (4) sur un axe de travail (11) et un mécanisme de percussion (6) qui comporte un percuteur (14) se déplaçant périodiquement suivant un mouvement alternatif sur l'axe de travail (11). Le mécanisme de percussion (6) est fixé dans un boîtier (20) de la machine. Une poignée (9) est fixée au boîtier (20) de la machine au moyen d'un amortisseur (21). L'amortisseur (21) présente une surface côté machine (25) reliée au boîtier (20) et une surface côté poignée (24) reliée à la poignée (9). Un bloc (27) en élastomère poreux est disposé de façon adjacente à la surface côté machine (25) et à la surface côté poignée (24). Une cavité (30) remplie d'air est prévue dans le bloc (27) entre la surface côté machine (25) et la surface côté poignée (24).
EP15713756.3A 2014-05-09 2015-04-01 Machine-outil portative Active EP3140081B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14167638.7A EP2942158A1 (fr) 2014-05-09 2014-05-09 Machine-outil portative
PCT/EP2015/057150 WO2015169515A1 (fr) 2014-05-09 2015-04-01 Machine-outil à main

Publications (2)

Publication Number Publication Date
EP3140081A1 true EP3140081A1 (fr) 2017-03-15
EP3140081B1 EP3140081B1 (fr) 2022-07-27

Family

ID=50678076

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14167638.7A Withdrawn EP2942158A1 (fr) 2014-05-09 2014-05-09 Machine-outil portative
EP15713756.3A Active EP3140081B1 (fr) 2014-05-09 2015-04-01 Machine-outil portative

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14167638.7A Withdrawn EP2942158A1 (fr) 2014-05-09 2014-05-09 Machine-outil portative

Country Status (4)

Country Link
US (1) US10654158B2 (fr)
EP (2) EP2942158A1 (fr)
CN (1) CN106457542A (fr)
WO (1) WO2015169515A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6620434B2 (ja) * 2015-06-12 2019-12-18 マックス株式会社 打撃工具
DE102017002094A1 (de) * 2017-03-04 2018-09-06 Andreas Stihl Ag & Co. Kg Elektrisches Arbeitsgerät mit Vibrationsentkopplung
US12021437B2 (en) 2019-06-12 2024-06-25 Milwaukee Electric Tool Corporation Rotary power tool
JP7585085B2 (ja) * 2021-02-22 2024-11-18 株式会社マキタ 打撃工具
US11945084B2 (en) 2021-04-26 2024-04-02 Snap-On Incorporated Offset impact mechanism for a hammer tool
US11759938B2 (en) 2021-10-19 2023-09-19 Makita Corporation Impact tool

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Publication number Priority date Publication date Assignee Title
JPS5834271B2 (ja) * 1980-07-18 1983-07-26 日立工機株式会社 振動工具のハンドル防振装置
DE3410669A1 (de) * 1984-03-23 1985-10-24 Metabowerke GmbH & Co, 7440 Nürtingen Daempfungselement und dessen einbau in ein motorisch angetriebenes handwerkzeug
SE467635B (sv) * 1988-09-30 1992-08-17 Electrolux Ab Vibrationsdaempare i motorsaag
US4879847A (en) * 1989-03-13 1989-11-14 Snap-On Tools Corporation Cover for pneumatic tool
JPH08126975A (ja) * 1994-10-28 1996-05-21 Hitachi Koki Co Ltd 電気ハンマの防振ハンドル
JPH0825249A (ja) * 1994-07-12 1996-01-30 Makita Corp 振動工具及び防振リング
DE19502171C2 (de) * 1995-01-25 2003-12-18 Stihl Maschf Andreas Handgeführtes Arbeitsgerät
DE19530712B4 (de) * 1995-08-21 2006-12-28 Fa. Andreas Stihl Antivibrationselement zur Anordnung zwischen einer Motoreinheit und einer Griffeinheit bei einem handgeführten Arbeitsgerät
FR2797208B1 (fr) * 1999-08-03 2002-10-18 Stihl Maschf Andreas Element antivibrations pourvu d'une surete d'arrachement
JP2002039267A (ja) * 2000-07-31 2002-02-06 Kioritz Corp 防振部材及び防振装置
GB2407789A (en) * 2003-11-04 2005-05-11 Black & Decker Inc Vibration reduction apparatus for a power tool
DE102005038091A1 (de) * 2005-08-11 2007-02-15 Hilti Ag Handwerkzeuggerät mit Vibrationsminderung
AU2007225033B8 (en) * 2006-03-15 2012-12-06 Integrated Tool Solutions, Llc Jackhammer with a lift assist
JP4626574B2 (ja) * 2006-06-16 2011-02-09 日立工機株式会社 電動工具
DE102007009169A1 (de) * 2007-02-26 2008-08-28 Robert Bosch Gmbh Handgriff
DE102007055735A1 (de) * 2007-03-29 2008-10-02 Robert Bosch Gmbh Handgriff
US7806201B2 (en) * 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
DE102007037048A1 (de) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Zusatzhandgriffvorrichtung
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DE102007049881A1 (de) * 2007-10-18 2009-04-23 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
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WO2011049496A1 (fr) * 2009-10-23 2011-04-28 Husqvarna Ab Outil de travail à main
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Also Published As

Publication number Publication date
CN106457542A (zh) 2017-02-22
WO2015169515A1 (fr) 2015-11-12
US10654158B2 (en) 2020-05-19
EP3140081B1 (fr) 2022-07-27
EP2942158A1 (fr) 2015-11-11
US20170144287A1 (en) 2017-05-25

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