EP3140081B1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3140081B1
EP3140081B1 EP15713756.3A EP15713756A EP3140081B1 EP 3140081 B1 EP3140081 B1 EP 3140081B1 EP 15713756 A EP15713756 A EP 15713756A EP 3140081 B1 EP3140081 B1 EP 3140081B1
Authority
EP
European Patent Office
Prior art keywords
handle
working axis
cavity
machine
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.)
Active
Application number
EP15713756.3A
Other languages
German (de)
English (en)
Other versions
EP3140081A1 (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
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Hilti AG
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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
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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
    • B25D17/04—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 according to the preamble of claim 1.
  • a hand tool is from DE 195 25 251 A1 known.
  • DE 102010040094 A1 and EP 1 752 257 A2 refer to a handheld power tool.
  • the hand-held power tool has a tool holder for holding a tool on a working axis and a percussion mechanism, which has a hammer that is periodically moved back and forth on the working axis.
  • the hammer mechanism is fixed in a machine housing.
  • a handle is attached to the machine body 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.
  • a block of cellular elastomer is disposed adjacent the machine side surface and the handle side surface.
  • 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 the damper to become stiffer as the user's contact pressure increases.
  • the stiffness can easily be adjusted to a desired characteristic.
  • the cavities in the block have proven to be sufficiently robust under continuous loading, in particular with regard to abrasion.
  • a hammer drill 1 shows a hammer drill 1 as an example of a chiseling hand-held power tool.
  • a motor 5, which drives an impact mechanism 6 and an output shaft 7 forms a primary drive of the hammer drill 1 .
  • a battery pack 8 or a power line supplies the motor 5 with power.
  • a user can guide the hammer drill 1 using a handle 9 and put the hammer drill 1 into operation using a system switch 10 .
  • the rotary hammer 1 rotates the drill 4 continuously about a working axis 11 and can hit the drill 4 in the direction of impact 12 along the working axis 11 into a substrate.
  • the percussion mechanism 6 is a pneumatic percussion mechanism 6.
  • An exciter piston 13 and a beater 14 are movably guided in a guide tube 15 in the percussion mechanism 6 along the working axis 11 .
  • the exciter piston 13 is coupled to the motor 5 via an eccentric 16 and is forced to perform a periodic, linear movement.
  • a connecting rod 17 connects the eccentric 16 to the exciter piston 13.
  • An air spring formed by a pneumatic chamber 18 between the exciter piston 13 and the hammer 14 couples a movement of the hammer 14 to the movement of the exciter piston 13 .
  • the striker 14 can strike a rear end of the drill 4 directly or indirectly transmit part of its momentum to the drill 4 via an intermediate striker 19 which is essentially stationary.
  • the percussion mechanism 6 and preferably the other drive components are arranged inside a machine housing 20 .
  • a recoil of the pneumatic percussion mechanism 6 is transmitted to the handle 9 via the machine housing 20 .
  • the handle 9 is suspended from the machine body 20 via a damper 21 to reduce peak recoil loading.
  • the damper 21 is in a section in 2 shown.
  • the damper 21 has a plunger 22 which is rigidly attached to the handle 9 .
  • the stamp 22 is arranged in a cage 23 which is rigidly attached 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 pointing punch surface 24, which is opposite to the impact direction 12 pointing abutment surface 25 of the cage 23.
  • the two surfaces 24, 25 are preferably flat or, if curved, have the same curvature.
  • the stamping surface 24 is substantially uniform over its entire surface to the stop surface 25 at a distance 26.
  • the damper 21 has a porous elastomeric body 27 which is arranged between the plunger 22 and the cage 23 .
  • the porous elastomeric body 27 transmits a force from the handle 9 to the machine housing 20 in the direction of impact 12.
  • the porous elastomeric body 27 has a buffer section 28 which bears against the stamping surface 24 and the opposing stop surface 25 .
  • the dimensions of the buffer section 28 perpendicular to the working axis 11 are equal to the corresponding dimensions of the stamping surface 24, which is attached to the handle 9 here, for example.
  • the outer surface of the porous elastomer body 27 pointing in the direction of impact 12 rests 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 rests flush and completely against the punch surface 24 .
  • the porous elastomer body 27, in particular the buffer section 28, is compressed when the user presses the handle 9 in the impact direction 12 .
  • the vibrations of the rotary hammer 1 act on the porous elastomer body 27 in a dynamic manner.
  • the design of the buffer section 28 that rests continuously against the stamp surface 24 and the stop surface 25 effectively prevents the buffer section 28 from moving parallel to the stamp surface 24 and the stop surface 25 during dynamic load changes.
  • the porous elastomer body 27 is preferably surrounded by an air gap 29 on its outer surfaces pointing perpendicularly to the working axis 11 surround.
  • the air gap 29 is dimensioned sufficiently so that the porous elastomer body 27 does not touch the side of the cage 23 or another housing 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 ( 2 ).
  • the porous elastomer body 27 can thus be cut out of a cuboid by means of a water jet saw.
  • the porous elastomer body 27 shown has, for example, two air-filled cavities 30.
  • the cavities 30 are arranged within the buffer section 28, ie between the stamping surface 24 and the stop surface 25 .
  • the cavities 30 are within the buffer portion 28 in the sense that they do not open onto the punch surface 24 or the stop surface 25 .
  • the cavity 30 is closed along the working axis 11 .
  • the cavity 30 may open in a direction perpendicular to the working axis 11 .
  • the cavities 30 illustrated by way of example have a cylindrical shape with an elliptical cross-section which extends through the entire porous elastomeric body 27 .
  • the axes of the cavities 30 are, for example, parallel to the handle axis.
  • the largest dimension 31 of the cavity 30 along the working axis 11, here the smaller semi-axis of the ellipse, is between 20% and 50% of the distance 26 of the punch surface 24 from the stop surface 25, i.e. the axial outer dimension of the buffer section 28.
  • the axial dimensions of the porous Elastomer body 27 are to be determined without any external force acting on the damper 21 , in particular without the user exerting any pressure on the handle 9.
  • the cavities 30 are increasingly compressed until the opposite inner surfaces 32, 33 of the cavity 30 are completely against one another come to the point.
  • the rigidity of the buffer section 28 increases with increasing contact pressure until the cavity 30 is closed.
  • the damper 21 which is soft with a low holding force, transmits only a few vibrations when the user holds the handle 9 loosely. In principle, as the contact pressure increases, more vibrations are transmitted, but the user's arm also causes natural damping. The latter effect is saturated, which is why a further increase in rigidity is disadvantageous for ergonomics from a medium holding force.
  • the cavity 30 preferably has a constant cross-section along an axis.
  • the axis is perpendicular or inclined to the working axis 11.
  • the cavity 30 is closed annularly in 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 the dimension 31 along the working axis 11.
  • the opposing inner surfaces 32, 33 can touch each other, particularly the points originally farthest along the working axis 11 , without cracking occurring in the porous elastomeric body 27 during dynamic loads.
  • the cavity 35 has a teardrop-shaped cross-section.
  • An inner surface 36 facing the cage 23 and inner surface 37 opposite this, facing the plunger 22 are essentially planar and converge to a point.
  • the two inner surfaces 36, 37 are respectively inclined to each other at an angle of between 30 degrees and 90 degrees.
  • the two flat inner surfaces 36, 37 are connected by a semi-cylindrical inner surface.
  • An axis of the gob shape, i.e. from the tip to the half-cylinder, is perpendicular to the working axis 11.
  • a width 38 of the gob i.e.
  • its dimension 31 along the working axis 11 is preferably in the range between 20% and 50% of the distance 26 of the punch face 24 from 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)

Claims (5)

  1. Machine-outil à main (1) comportant :
    un porte-outil (2) permettant de maintenir un outil (4) sur un axe de travail (11), un outil de percussion (6) qui présente un percuteur (14) déplacé d'avant en arrière périodiquement sur l'axe de travail (11), un boîtier de machine (20) dans lequel est fixé l'outil de percussion (6), une poignée (9) fixée au boîtier de machine (20) au moyen d'un amortisseur (21), l'amortisseur (21) présentant une surface côté machine (25) reliée au boîtier de machine (20), une surface côté poignée (24) reliée à la poignée (9), et un bloc (27) en élastomère poreux étant disposé adjacent à la surface côté machine (25) et à la surface côté poignée (24),
    caractérisée en ce qu'une cavité (30) remplie d'air est prévue à l'intérieur du bloc (27) entre la surface côté machine (25) et la surface côté poignée (24), la cavité (30) étant fermée le long de l'axe de travail (11).
  2. Machine-outil à main (1) selon la revendication 1,
    caractérisée en ce qu'une dimension (31, 38) de la cavité (30) le long de l'axe de travail (11) est comprise entre 20 % et 50 % de la distance (26) de la surface côté machine (25) par rapport à la surface côté poignée (24) le long de l'axe de travail (11).
  3. Machine-outil à main (1) selon la revendication 1 ou 2,
    caractérisée en ce que la dimension (31) de la cavité (30) le long de l'axe de travail (11) est inférieure à la dimension (34) de la cavité (30) dans des directions perpendiculaires à l'axe de travail (11).
  4. Machine-outil à main (1) selon l'une des revendications précédentes, caractérisée en ce que la cavité (30) présente une section transversale en forme de goutte.
  5. Machine-outil à main (1) selon la revendication 4,
    caractérisée en ce que la cavité est ouverte le long d'un axe perpendiculaire à l'axe de travail (11).
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 EP3140081A1 (fr) 2017-03-15
EP3140081B1 true 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 (5)

* 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
JP2022128006A (ja) * 2021-02-22 2022-09-01 株式会社マキタ 打撃工具
US11759938B2 (en) 2021-10-19 2023-09-19 Makita Corporation Impact tool

Family Cites Families (27)

* Cited by examiner, † Cited by third party
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
CA2680730C (fr) * 2006-03-15 2014-05-27 Integrated Tool Solutions, Llc Marteau-piqueur equipe d'un mecanisme d'aide au soulevement
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DE102007009169A1 (de) * 2007-02-26 2008-08-28 Robert Bosch Gmbh Handgriff
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US7806201B2 (en) * 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
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US20120048580A1 (en) * 2010-09-01 2012-03-01 Hilti Aktiengesellschaft Power tool

Also Published As

Publication number Publication date
EP3140081A1 (fr) 2017-03-15
US10654158B2 (en) 2020-05-19
US20170144287A1 (en) 2017-05-25
CN106457542A (zh) 2017-02-22
WO2015169515A1 (fr) 2015-11-12
EP2942158A1 (fr) 2015-11-11

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