EP2684646B1 - Machine-outil manuelle - Google Patents

Machine-outil manuelle Download PDF

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Publication number
EP2684646B1
EP2684646B1 EP13175645.4A EP13175645A EP2684646B1 EP 2684646 B1 EP2684646 B1 EP 2684646B1 EP 13175645 A EP13175645 A EP 13175645A EP 2684646 B1 EP2684646 B1 EP 2684646B1
Authority
EP
European Patent Office
Prior art keywords
sliding surface
guide
section
hand
working axis
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
EP13175645.4A
Other languages
German (de)
English (en)
Other versions
EP2684646A1 (fr
Inventor
Aaron Wiedner
Markus Hartmann
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 EP2684646A1 publication Critical patent/EP2684646A1/fr
Application granted granted Critical
Publication of EP2684646B1 publication Critical patent/EP2684646B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • B25D2217/0015—Anvils
    • 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
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2250/225—Serrations
    • 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
    • B25D2250/231—Sleeve details
    • 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
    • B25D2250/345—Use of o-rings

Definitions

  • the present invention relates to a chiselling or drill chiseling hand tool according to the preamble of claim 1 and as shown in EP 147485 A1 known.
  • the hand tool of the invention has a tool holder, a motor and a pneumatic percussion.
  • the percussion mechanism has a pathogen driven by the motor along a working axis, a racket coupled to the pathogen via an air spring and an intermediate racket arranged in the direction of impact between the racket and the tool holder.
  • the striking mechanism also has a guide in which the intermediate beater is guided.
  • the guide has a first sliding surface that guides a first portion of the intermediate racket and a second sliding surface that is offset from the first sliding surface in the direction of impact and that guides a second portion of the intermediate racket.
  • a radial dimension of the first portion of the intermediate striker is greater than a radial dimension of the second portion of the intermediate striker.
  • the intermediate beater is preferably guided at its section closest to the tool and at its section with the largest diameter.
  • a guide length of the intermediate beater is large in the working mode, since then the intermediate beater is engaged substantially against the direction of impact in the guide.
  • the intermediate beater In blank beats the intermediate beater typically slides in the direction of impact to a stop. This shortens the guide length which can lead to a slight tilting of the intermediate racket. The slight tilting favors a shutdown of the percussion after a blank. It is envisaged that all arranged in the direction of impact before the first section portions of the intermediate racket are unguided, preferably at least when the intermediate racket rests in the direction of impact against a stop.
  • An embodiment provides that the intermediate beater rests in any position in the guide on the first sliding surface and on the second sliding surface.
  • a length of the second sliding surface is less than 25% of a length of the second portion of the intermediate racket. The intermediate beater slides out of the second sliding surface during a movement in the direction of impact, which shortens the guide length.
  • An embodiment provides that the first sliding surface and the second sliding surface are parallel to the working axis.
  • first sliding surface and the second sliding surface are inner surfaces of a one-piece sleeve. In this way, it can be ensured, in particular, that the axes of the preferably cylindrical sliding surfaces are coaxial with one another.
  • An embodiment provides that in the first sliding surface and / or the first portion along the working axis extending grooves are provided.
  • An embodiment provides that a sealing ring is arranged on the second sliding surface.
  • the second sliding surface and the second portion of the intermediate beater preferably complete with each other airtight or dustproof.
  • the sealing ring can promote the conclusion.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 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 user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • the percussion 6 is, for example, a pneumatic percussion 6.
  • a pathogen 12 and a racket 13 are guided in the percussion 6 along the working axis 10 movable.
  • the exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and forced to a periodic, linear movement.
  • An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
  • the beater 13 beats indirectly over a substantially resting intermediate beater 16 on a rear end of the drill bit 4 and transmits part of its impulse to the drill bit 4.
  • the hammer mechanism 6 and preferably the other drive components are arranged within a machine housing 17 .
  • Fig. 1 and Fig. 2 illustrate the hammer drill 1 in working mode.
  • the drill bit 4 rests against a workpiece and is pushed into the tool holder 2 by the user.
  • the drill bit 4 pushes the intermediate beater 16 counter to the direction of impact 11 up to its front stop 18. This position is referred to below as the operating point.
  • the racket 13 can strike the intermediate racket 16 in working position.
  • the intermediate beater 16 will thereby approximately as far as the hammer drill 1 penetrates into the workpiece in the direction of impact 11 move forward.
  • the pressure applied by the user pushes the intermediate beater 16 back to the operating point.
  • the weight of the hammer drill 1 can stand on the drill bit 4, the intermediate racket 16 push into the operating point.
  • Fig. 3 illustrates the hammer drill 1 when the drill bit 4 is lifted from the workpiece and the drill bit 4 no force against the direction of impact 11 acts.
  • the intermediate beater 16 can slide substantially without counterforce from the operating point to a rear stop 19 in the direction of impact 11 . This position will be below referred to as a blank position.
  • the intermediate rack 16 remains in this Leerschlagposition.
  • the bat 13 no longer hits the intermediate beater 16, whereby, inter alia, the pneumatic percussion 6 is deactivated.
  • the bat 13 lacks the recoil after the impact on the intermediate beater 16 to move in time with the exciter 12 .
  • the intermediate beater 16 has in the direction of impact 11 successively three cylindrical sections: a front portion 20, a middle portion 21 and a rear portion 22.
  • the rear portion 22 strikes with its pointing in the direction of impact 11 surface 23 on the drill bit 4 .
  • the rear portion 22 is adapted with its diameter to the diameter of the tool holder 2 absorbable shaft ends 3 . Typically, the diameters are matched to approximately 10%.
  • a diameter of the front portion 20 may be formed substantially equal to the rear portion 22 .
  • the middle section 21 has a larger diameter.
  • the entire intermediate beater 16 is largely a rotational body.
  • the intermediate beater 16 can slide in a linear guide 25 along the working axis 10 .
  • the intermediate beater 16 rests with the radial surface 26 of the central portion 21 on a front sliding surface 27 of the linear guide 25 and with the radial surface 28 of the rear portion 22 on a rear sliding surface 29 of the linear guide 25 .
  • the front sliding surface 27 and the rear sliding surface 29 are substantially parallel, preferably coaxial with the working axis 10.
  • the sliding surfaces 27, 29 are preferably cylindrical or prismatic.
  • the front sliding surface 27 is at a first radial distance 30 to the working axis 10, which is substantially equal to the radial dimension of the central portion 21 of the intermediate beater 16 .
  • the middle portion 21 is thus guided with slight radial play through the front sliding surface 27 .
  • the rear sliding surface 29 is at a second radial distance 31 from the working axis 10, which is substantially equal to the radial dimension of the rear portion 22 of the intermediate beater 16 .
  • the rear portion 22 is guided by the rear sliding surface 29 with a small clearance.
  • the first radial dimension 30 is accordingly larger than the second radial dimension 31.
  • the front sliding surface 27 and the rear sliding surface 29 follow along the direction of impact 11 on each other, preferably directly or only separated by an inclined to the working axis 10 stop surface 19 .
  • the front portion 20 of the intermediate beater 16 is not guided, neither by the previously described guide 25 nor by another structure.
  • the front portion 20 is spaced from the guide 25 in the radial direction.
  • the entire front portion 20 is preferably surrounded by a sleeve-shaped air gap 32 .
  • the air gap 32 is at least 2 mm thick.
  • the middle portion 21 is preferably on its entire length 33 on the front sliding surface 27 and this regardless of the position of the intermediate beater 16.
  • the effective guide length 34 of the intermediate beater 16 varies with its position between the home position and the Leerschlag too.
  • the effective guide length 34 is defined as the distance from the foremost edge 35 in the direction of impact 11 of the central portion 21 of the intermediate beater 16 to the rearmost edge 36 in the direction of impact 11 of the rear sliding surface 29 .
  • the guide length 34 is maximum ( Fig. 2 ).
  • the middle portion 21 is as far away as possible from the rear sliding surface 29 and the stopper 19 . A tilting of the intermediate beater 16 is not possible and only to a negligible extent.
  • the guide length 34 is minimal ( Fig. 3 ).
  • the middle section 21 adjoins the rear sliding surface 29 almost directly.
  • the significantly reduced guide length 34 allows limited frame tilting of the intermediate beater 16 relative to the working axis 10. This may be advantageous for the shutdown of the impact mechanism at a blank.
  • the effective guide length 34 may be less than half as large as in the home position in the idle position.
  • the rear portion 22 is only partially based on its length 37 on the rear sliding surface 29 at.
  • a length 38 of the rear sliding surface 29 is significantly less than a length 37 of the rear portion 22 of the intermediate beater 16.
  • the ratio of the lengths 37, 38 is in the range between 5% and 25%.
  • the rear portion 22 slides out in the direction of impact 11 from the rear sliding surface 29 .
  • the region of the intermediate beater 16 touched by the first sliding surface 27 therefore travels along the intermediate beater 16, for example relative to the end surfaces.
  • the touched area has a rearmost edge 36 pointing in the direction of impact 11 , which limits the effective guide length 34 .
  • the guide 25 is formed for example by a hollow cylindrical sleeve 39 .
  • the sleeve 39 has a diameter corresponding to the radial dimension 30 of the front Sliding surface 27.
  • the length of the sleeve 39 corresponds to the maximum guide length 34, ie the guide length 34 in the basic position.
  • the sleeve 39 has at its rear end in the direction of impact 11 a projecting edge 40, which forms a circular opening which forms the rear sliding surface 29 .
  • the projecting edge 40 also forms the rear stop 19.
  • a radius of the opening corresponds to the second radial dimension 31.
  • a ring 41 is arranged in the direction of impact 11 immediately in front of the sleeve 39 .
  • the ring 41 forms the front stop 19.
  • the ring 41 may be formed of an elastic or damping material.
  • the front sliding surface 27 can move away from the working axis 10 in the direction of impact 11 .
  • the front sliding surface 27 is conical.
  • the inclination is preferably less than 5 degrees, eg less than 2 degrees.
  • the positive guidance of the intermediate beater 16 along the working axis 10 is additionally reduced from the operating point to the idling position.
  • the guide 25 concludes with the intermediate beater 16 from a cavity which is bounded by the rear stop 19 and the first sliding surface 27 .
  • the air can escape from the cavity through grooves 42 in the sleeve 39 .
  • the grooves 42 are embossed along the working axis 10 in the first sliding surface 27 .
  • the grooves 42 preferably extend over the entire length of the front sliding surface 27.
  • the rear sliding surface 29 preferably closes off airtight with the intermediate beater 16.
  • a sealing ring 43 may be recessed in the rear sliding surface 29 to compensate for tolerances and to ensure a permanent seal.
  • no sealing member is provided at the front sliding surface 27 and the middle portion 21 .
  • Fig. 5 and Fig. 6 show a further embodiment.
  • the intermediate beater 16 is guided at its central portion 22 by the front sliding surface 27 and its rear portion 22 by the rear sliding surface 29 of the guide 25 .
  • the front portion 20 is unguided.
  • the middle portion 21 is provided with a plurality of grooves 44 extending along the working axis 10 or key surfaces.
  • Fig. 7 shows a further embodiment.
  • the intermediate beater 16 is guided at its central portion 22 by the front sliding surface 27 and its rear portion 22 by the rear sliding surface 29 of the guide 25 .
  • an opening to a vent channel 46 is provided in the front sliding surface 27 .
  • the opening is preferably close to the rear stop 19 for the intermediate beater 16.
  • the vent passage 46 extends from the Opening preferably opposite to the direction of impact 11.
  • the cavity between the rear stop 19 and the intermediate beater 16 is preferably connected by the vent passage 46 with a dust-free space, for example the space between the intermediate beater 16 and the racket 13 .

Landscapes

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

Claims (7)

  1. Machine-outil manuelle (1) comportant un mandrin d'outil (2), un moteur (5), un mécanisme de percussions pneumatique (6) comportant un excitateur (12) entraîné par le moteur (5) le long d'un axe de travail (10) et un percuteur (13) couplé à l'excitateur (12) par l'intermédiaire d'un ressort pneumatique (15) et un percuteur intermédiaire (16) agencé dans une direction de percussion (11) entre le percuteur (13) et le mandrin d'outil (2), et un guide (25) dans lequel le percuteur intermédiaire (16) est guidé,
    dans laquelle le guide (25) comporte une première surface de glissement (27) guidant une première partie (21) du percuteur intermédiaire (16), et une seconde surface de glissement (29) agencée de manière décalée par rapport à la première surface de glissement (27) dans la direction de percussion (11), laquelle seconde surface de glissement guide une seconde partie (22) du percuteur intermédiaire (16), et
    dans laquelle une dimension radiale (30) de la première partie (21) du percuteur intermédiaire (16) est plus grande qu'une dimension radiale (31) de la seconde partie (22) du percuteur intermédiaire (16), caractérisée en ce que
    toutes les parties (20) du percuteur intermédiaire (16) agencées avant la première partie (21) dans la direction de percussion (11) sont non guidées, au moins lorsque le percuteur intermédiaire (16) vient en contact avec une butée (19) dans la direction de percussion (11).
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le percuteur intermédiaire (16) est en contact, dans chaque position dans le guide (25), avec la première surface de glissement (27) et avec la seconde surface de glissement (29).
  3. Machine-outil manuelle selon la revendication 1 ou 2, caractérisée en ce qu'une longueur (38) de la seconde surface de glissement (29) est plus petite que 25 % d'une longueur (38) de la seconde partie (22).
  4. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que la première surface de glissement (27) est parallèle à l'axe de travail (10) ou est éloignée de l'axe de travail (10) à un angle inférieur à 5 degrés dans la direction de percussion (11).
  5. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que la première surface de glissement (27) et la seconde surface de glissement (29) sont des surfaces intérieures d'une douille monobloc (39).
  6. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que des rainures (42) s'étendant le long de l'axe de travail (10) sont prévues dans la première surface de glissement (27) et/ou dans la première partie (21).
  7. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce qu'une bague d'étanchéité (43) est agencée sur la seconde surface de glissement (29).
EP13175645.4A 2012-07-12 2013-07-09 Machine-outil manuelle Active EP2684646B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012212231.1A DE102012212231A1 (de) 2012-07-12 2012-07-12 Handwerkzeugmaschine

Publications (2)

Publication Number Publication Date
EP2684646A1 EP2684646A1 (fr) 2014-01-15
EP2684646B1 true EP2684646B1 (fr) 2017-02-22

Family

ID=48746377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13175645.4A Active EP2684646B1 (fr) 2012-07-12 2013-07-09 Machine-outil manuelle

Country Status (4)

Country Link
US (1) US10058987B2 (fr)
EP (1) EP2684646B1 (fr)
CN (1) CN103538032B (fr)
DE (1) DE102012212231A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012206451B4 (de) * 2012-04-19 2020-12-10 Hilti Aktiengesellschaft Handwerkzeugmaschine
EP2910337A1 (fr) * 2014-02-20 2015-08-26 HILTI Aktiengesellschaft Porte-outil
EP2918376A1 (fr) * 2014-03-12 2015-09-16 HILTI Aktiengesellschaft Machine-outil portative de burinage
EP3181298A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
EP3181300A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3670097A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Machine-outil portative
CN116175491A (zh) 2023-03-15 2023-05-30 江苏东成工具科技有限公司 电动工具

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
DE3304916A1 (de) * 1983-02-12 1984-08-16 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3526996C2 (de) * 1985-07-27 1996-09-19 Hilti Ag Bohr- und Meisselhammer mit Entlüftung
DE3826213A1 (de) 1988-08-02 1990-02-15 Bosch Gmbh Robert Bohr- oder schlaghammer
JP3369844B2 (ja) * 1996-05-15 2003-01-20 リョービ株式会社 空打ち防止機構を有する回転打撃工具
DE19651828A1 (de) * 1996-12-13 1998-06-18 Bosch Gmbh Robert Mehrganggetriebe für Handwerkzeugmaschinen
GB9909987D0 (en) * 1999-04-30 1999-06-30 Black & Decker Inc Rotary hammer
DE10253972A1 (de) 2002-11-20 2004-06-03 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- oder Schlaghammer
GB2401570B (en) 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
DE10362025B4 (de) * 2003-05-20 2006-02-09 Robert Bosch Gmbh Bohr- oder Schlaghammer
GB0613181D0 (en) * 2006-07-01 2006-08-09 Black & Decker Inc Pavement breaker
US7383895B2 (en) * 2005-08-19 2008-06-10 Makita Corporation Impact power tool
US7413026B2 (en) 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
DE102007000081A1 (de) 2007-02-08 2008-08-21 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
JP5128391B2 (ja) * 2008-07-03 2013-01-23 株式会社マキタ ハンマードリル
DE102009008190A1 (de) * 2009-01-30 2010-08-05 Hilti Aktiengesellschaft Pneumatisches Schlagwerk
DE102009050014B4 (de) * 2009-10-21 2013-07-11 Metabowerke Gmbh Motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart
DE102010029915A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine und Steuerungsverfahren

Also Published As

Publication number Publication date
EP2684646A1 (fr) 2014-01-15
CN103538032B (zh) 2017-11-14
DE102012212231A1 (de) 2014-01-16
US10058987B2 (en) 2018-08-28
CN103538032A (zh) 2014-01-29
US20140014383A1 (en) 2014-01-16

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