EP1882558B1 - Outil à main doté d'un dispositif de découplage - Google Patents

Outil à main doté d'un dispositif de découplage Download PDF

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Publication number
EP1882558B1
EP1882558B1 EP07112659.3A EP07112659A EP1882558B1 EP 1882558 B1 EP1882558 B1 EP 1882558B1 EP 07112659 A EP07112659 A EP 07112659A EP 1882558 B1 EP1882558 B1 EP 1882558B1
Authority
EP
European Patent Office
Prior art keywords
bearing
housing
hand tool
spring
handle
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
EP07112659.3A
Other languages
German (de)
English (en)
Other versions
EP1882558A1 (fr
Inventor
Axel Fischer
Roland Meuer
Rüdiger Schulz
Ferdinand Kristen
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 EP1882558A1 publication Critical patent/EP1882558A1/fr
Application granted granted Critical
Publication of EP1882558B1 publication Critical patent/EP1882558B1/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
    • 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
    • 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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • 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
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other
    • 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 a hand tool, in particular in the form of an optionally usable as a drill or chisel hammer electro combi hammer.
  • On off EP 1 674 210 B1 known electro-combination hammer has a housing in which a working means is provided, which is reciprocable in operation along a spaced apart from a center of gravity of the power tool working axis and which is parallel to a first direction.
  • the working fluid may be formed by a percussion piston of an electropneumatic striking mechanism.
  • the hand tool has a handle which is held on the housing via a sprung decoupling arrangement to reduce the transmission of vibrations from the housing to the handle.
  • the decoupling arrangement has a first bearing arrangement and a second bearing arrangement. The second bearing arrangement is further spaced along a transverse to the working axis second direction of the working axis than the first bearing assembly.
  • torsional vibrations are generated on the housing during operation by the distance between the working axis and the center of gravity.
  • the transmission of vibrations resulting from these torsional vibrations can be reduced to the handle. This achieves not only a reduction in vibration along the first direction but also a significant reduction in vibration along the second direction and thus a high level of comfort when holding the device.
  • the vibration reduction takes place in all directions via the respective largely vibration-decoupled suspension, which virtually isolates a large part of the vibrations occurring during operation of the handle, depending on the spring means used also a more or less large damping effect is present. In the following, this is referred to as decoupling, irrespective of the proportion of the damping effect.
  • WO 2007/099132 A1 which falls under Article 54 (3) EPC, discloses a hand-held power tool having a housing in which a working means is provided which is reciprocable in operation along a working axis which is parallel to a first direction and transverse to the working axis standing second to a center of gravity of the power tool, and a handle, which is held on the housing via a sprung decoupling arrangement, which has a first bearing assembly and a second bearing assembly, wherein the second bearing assembly with respect to a transverse to the working axis second direction of the Working axis is further spaced than the first bearing assembly, wherein the first bearing assembly comprises a coupling device which is held relative to the housing via a housing-side pivot bearing relative to the housing and a handle-side pivot bearing relative to the handle.
  • a disadvantage of the known hand tool is that due to the all-round spring effect on both Abfederungs Schemeen no adequate decoupling of the handle of the torsional vibrations occurring on the housing is possible. Rather, the spring behavior of both Abfederungs Schemee is superimposed with regard to the torsional vibrations. Due to the relatively stiff lower Abfederungs Schemees and the superposition with acting in the second direction spring action of the upper Abfederungs Symposiumes remains in operation a relatively high vibration along the second direction.
  • the present invention has for its object to avoid the disadvantages mentioned in a generic hand tool and to reduce the vibrations transmitted to the handle as a result of torsional vibrations.
  • the object is achieved by a hand tool according to claim 1.
  • the first bearing arrangement has a coupling device which is held pivotably relative to the housing via a housing-side rotary bearing and via a handle-side rotary bearing relative to the handle.
  • This coupling device allows in operation an almost unimpeded rotational vibration of the housing of the power tool around its center of gravity, wherein the decoupling of the torsional vibration takes place almost exclusively on the second bearing assembly.
  • the handle on the first bearing arrangement along the second direction is guided more or less freely relative to the housing, so that the spring-loaded support acting in this direction takes place on the housing mainly on the second bearing arrangement.
  • This makes it possible to optimally tune the decoupling along the first direction independently of the decoupling along the second direction to the respective requirements. In this way, due to the torsional vibrations on the housing occurring vibrations are particularly well decoupled from the handle, whereby the user perceives only greatly reduced vibrations on the handle.
  • the coupling device engages with respect to the first direction approximately at the height of the center of gravity and extends substantially parallel to the working axis.
  • the coupling device has a connecting rod-shaped member.
  • a connecting rod-shaped member allows a very stable double pivotal coupling of the handle to the housing. At the same time the space requirement of the coupling device is minimal.
  • the coupling device is U-shaped, wherein a first conical rod arranged in parallel second coned-shaped member is provided, which is connected via a along a third direction extending connection with the first conical member.
  • the third direction is perpendicular to the first direction and the second direction. In this way, the handle with respect to the third direction can be stored particularly stable on the housing.
  • a spring device acting in the first direction is provided on the first bearing arrangement, via which the handle is supported along the first direction on the housing.
  • the spring device advantageously has a circumferential in cross-section spring body, which is arranged on the housing-side pivot bearing between a housing-side bearing means and a coupling device side bearing means.
  • annular, circumferential spring body for example, sitting on a housing-side journal and radially outward an eye of the connecting rod-shaped member is supported, the coupling device can be decoupled from the housing both along the first and along the second direction effectively.
  • the spring body is made of a foamed elastomer.
  • particularly suitable spring properties of the spring body can be ensured with cost-effective production.
  • the dimensions of such a spring body in different directions can be easily formed so that along the respective directions a different spring constant is set.
  • the connecting rod-shaped member advantageously has a first part member and a second part member, which are guided to each other telescopically.
  • the spring device also has a spring element, via which one of the sub-members is supported along the first direction, for example, on the respective other sub-member or on the housing-side rotary bearing.
  • the spring element is formed by a foamed elastomer, which has a progressive characteristic and ensures a nearly constant spring characteristic over the life of the decoupling.
  • the spring element may also be formed by a coil spring.
  • the second bearing arrangement has a bar-shaped, that is to say elongate, bearing element, which is radially enclosed by a, for example, tubular bearing element with the interposition of a second spring device.
  • a second spring device allows a particularly good setting of a predetermined spring stiffness, which acts uniformly in the radial direction around the bolt-shaped bearing element around.
  • a relatively soft spring action in the direction of rotation can be generated around the latch-shaped bearing element. Overall, this results in a particularly good decoupling of the handle against the vibrations generated as a result of torsional vibrations on the housing.
  • Fig. 1 shows the basic structure of a hand tool 2 in the form of an optionally usable as a drill or chisel hammer electro combi hammer.
  • This has a housing 4, in which a drive motor 6 and a driven by this electro-pneumatic drive unit 8, which includes, for example, a striking mechanism and a transmission housed.
  • the drive unit 8 has a working means 10, for example in the form of a percussion piston, which is reciprocated during operation along a working axis A, by which a parallel first direction z is set, which corresponds to the working direction of the hand tool 2.
  • the working axis A in this case has a distance from a center of gravity S of the hand tool 2, which may be defined, for example, by the center of gravity of the hand tool 2 in the middle position of the working means 10. By this distance the Center of gravity S to the working axis A arise in operation torsional vibrations, which are indicated by the arrow DS.
  • a handle 14 is held, which extends substantially along a second direction y, which is perpendicular to the first direction z.
  • This is connected via a generally designated 16 sprung decoupling with the housing 4.
  • the decoupling arrangement 16 has a first bearing arrangement 18, which is arranged adjacent to the working axis A, and a second bearing arrangement 20 in the form of a sprung rotary bearing, which, with respect to the second direction y, is further spaced from the working axis A than the first bearing arrangement 18.
  • the first bearing arrangement 18 has a coupling device 22 with a first connecting rod-shaped member 24. This is held on a housing-side end 26 via a housing-side pivot bearing 28 on the housing 4, wherein on the coupling device 22, a first spring means 29 is provided.
  • the spring device 29 can have different spring constants for different sides or in different directions. For example, it may be useful to set along the first direction z in the direction of work, a relatively soft spring action to achieve a good decoupling of the vibrations during operation, while in the opposite direction, a high spring stiffness would be advantageous, for example, in jammed hand tool 2 as direct as possible To be able to ensure power transmission from the handle to the housing.
  • the coupling device 22 is also held pivotally on the handle 14 via a handle-side pivot bearing 32.
  • the second bearing assembly 20 has a housing-fixed bearing assembly 34 with a latch-shaped bearing element 36 which extends parallel to a third direction x, which is perpendicular to the first direction z and second direction y.
  • the latch-shaped bearing element 36 is supported radially circumferentially via a second spring device 38 on a tubular bearing element 40 of a grip-side bearing device 42.
  • the coupling device 22 in addition to the first connecting rod-shaped member 24, a second connecting rod-shaped member 44, wherein both members 24, 44 are parallel to each other and extend substantially along the first direction z.
  • they have at the handle end 30 a connection 46 which extends along a third direction x, which is perpendicular to the first direction z and to the second direction y.
  • the coupling device 22 has a U-shape, the Alternatively, by a further connection, not shown, also on the housing-side end 26 is expandable to a closed quadrangle shape.
  • This acts with the interposition of a circumferential spring body 50 of the spring device 29 together with a coupling device side bearing means 52 in the form of an eyelet which is formed on the housing-side end 26 of the connecting rod-shaped members 24, 44, as in particular 3 and 4 can be seen.
  • Corresponding bearing means 48, 52 are also provided on the housing-side end 26 of the second connecting rod-shaped member 44.
  • first spring device 29 on both conical members 24, 44 each have a support spring 54 which supports the respective member 24, 44 in the first direction z to a support member 56 of the drive unit 8 and via this on the housing 4.
  • the support springs 54 and the circumferential spring body 50 are formed as shown, for example, of a foamed elastomer and together form a spring unit, by which the handle 14 on the first bearing assembly 18 along the first direction z is sprung supported on the housing 4.
  • the support springs 54 have a different spring stiffness than the rotating spring body 50 and serve as an end stop to protect the rotating spring body 50 from overloading.
  • Fig. 5 shows the hand tool 2 with an alternative executed first bearing assembly 18.
  • elements with corresponding function have the same reference number, as in the embodiment of the Fig. 1 to 4 ,
  • the first ball-shaped member 24 and the second ball-shaped member 44 in this embodiment each have a housing-side first sub-member 58 and a grip-side second sub-member 60.
  • the first part member 58 about the housing-side pivot bearing 28 and the second part member 60 about the handle side pivot bearing 32 around pivot.
  • both sub-members 58, 60 are guided telescopically together.
  • the spring device by a respective, in Fig. 5 functionally illustrated as a coil spring, spring element 62 is formed, which is disposed within the sleeve-shaped first part member 58 and which is preferably formed of foamed elastomer having a progressive spring characteristic (see Fig. 8 ).
  • the second part member 60 acts as a piston, which is held in the first part member 58 and against the force of the spring element 62 along the first direction z to the housing 4 to be displaced.
  • the spring element 62 is supported, in particular from the Fig. 8 can be seen, at the end facing away from the second part of the member 60 from a helical fastener from which acts as a housing-side bearing means 48 and the coupling device side bearing means 52 projects through this, which are formed by corresponding receiving bores.
  • first bearing assembly 18 in both embodiments, a double pivoting on, by which the handle 14 along the second direction on the first bearing assembly 18 is virtually completely decoupled.
  • the sprung support in the second direction y is therefore carried out exclusively by the second spring means 38 on the second bearing assembly 20, which may also be formed, for example, by a foamed elastomer.
  • the handle 14 can be decoupled particularly well against the vibrations occurring on the housing 4 during operation as a result of the torsional vibrations about the center of gravity S.

Landscapes

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

Claims (9)

  1. Outil à main (2) comportant :
    un boîtier (4) dans lequel sont prévus des moyens de travail (10) qui, en fonctionnement, sont mobiles en va-et-vient le long d'un axe de travail (A) qui est parallèle à une première direction (z) et espacé d'un centre de gravité (S) de l'outil à main (2) dans une deuxième direction (y) perpendiculaire à l'axe de travail (A),
    et une poignée (14) maintenue sur le boîtier (4) par l'intermédiaire d'un ensemble de découplage monté sur ressort (16) qui comporte un premier ensemble de palier (18) et un second ensemble de palier (20), dans lequel le second ensemble de palier (20) est encore plus espacé de l'axe de travail (A) par rapport à une deuxième direction (y) perpendiculaire à l'axe de travail (A) que le premier ensemble de palier (18),
    dans lequel le premier ensemble de palier (18) comporte un dispositif de couplage (22) qui est maintenu de manière à pouvoir pivoter par rapport au boîtier (4) par l'intermédiaire d'un palier rotatif (28) côté boîtier et de manière à pouvoir pivoter par rapport à la poignée (14) par l'intermédiaire d'un palier rotatif (32) côté poignée,
    dans lequel le second ensemble de palier (20) comporte un élément de palier en forme de barre (36) qui est radialement entouré par un élément de palier (42) et entre lesquels est intercalé un second dispositif à ressort (38).
  2. Outil à main selon la revendication 1, caractérisé en ce que le dispositif de couplage (22) agit à la hauteur du centre de gravité (S) par rapport à la première direction (z) et s'étend de manière sensiblement parallèle à l'axe de travail (A).
  3. Outil à main selon la revendication 1 ou 2, caractérisé en ce que le dispositif de couplage (22) comporte un premier organe en forme de bielle (24).
  4. Outil à main selon la revendication 3, caractérisé en ce que le dispositif de couplage (22) est en forme de U, dans lequel un second organe en forme de bielle (44) et agencé parallèlement au premier organe en forme de bielle (24) est prévu, lequel second organe est relié au premier organe en forme de bielle (24) par l'intermédiaire d'une liaison (46) s'étendant le long d'une troisième direction (x), dans lequel la troisième direction (x) est perpendiculaire à la première direction (z) et à la deuxième direction (y).
  5. Outil à main selon l'une des revendications 1 à 4, caractérisé en ce qu'un premier dispositif à ressort (29) agissant dans la première direction (z) est prévu sur le premier ensemble de palier (18), dispositif à ressort par l'intermédiaire duquel la poignée (14) est supportée par le boîtier (4) dans la première direction (z).
  6. Outil à main selon la revendication 5, caractérisé en ce que le premier dispositif à ressort (29) comporte un corps élastique circonférentiel (50) qui est agencé sur le palier rotatif (28) côté boîtier entre des moyens de support (48) côté boîtier et des moyens de support (52) côté dispositif de couplage.
  7. Outil à main selon la revendication 6, caractérisé en ce que le corps élastique (50) est fabriqué à partir d'un élastomère expansé.
  8. Outil à main selon la revendication 5, caractérisé en ce que l'organe en forme de bielle (24) comporte un premier organe partiel (58) et un second organe partiel (60) qui sont guidés l'un par rapport à l'autre de manière télescopique, et le premier dispositif à ressort (29) comporte un élément à ressort (62) par l'intermédiaire duquel l'un des éléments partiels (58, 60) est supporté dans la première direction (z).
  9. Outil à main selon la revendication 8, caractérisé en ce que l'élément à ressort (62) est formé par un élastomère.
EP07112659.3A 2006-07-27 2007-07-18 Outil à main doté d'un dispositif de découplage Active EP1882558B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006000374A DE102006000374A1 (de) 2006-07-27 2006-07-27 Handwerkzeuggerät mit Entkopplungsanordnung

Publications (2)

Publication Number Publication Date
EP1882558A1 EP1882558A1 (fr) 2008-01-30
EP1882558B1 true EP1882558B1 (fr) 2017-01-04

Family

ID=38646723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07112659.3A Active EP1882558B1 (fr) 2006-07-27 2007-07-18 Outil à main doté d'un dispositif de découplage

Country Status (4)

Country Link
US (1) US7500527B2 (fr)
EP (1) EP1882558B1 (fr)
JP (1) JP5426084B2 (fr)
DE (1) DE102006000374A1 (fr)

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JP4756474B2 (ja) * 2006-07-20 2011-08-24 日立工機株式会社 電動工具
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JP5180697B2 (ja) * 2008-06-19 2013-04-10 株式会社マキタ 手持式作業工具
EP2241409B1 (fr) * 2009-04-17 2012-11-07 HILTI Aktiengesellschaft Outil à main avec amortisseur de vibrations
US7938196B2 (en) * 2009-04-17 2011-05-10 Hilti Aktiengesellschaft Hand-held power tool with vibration-compensating mass
GB2472997A (en) * 2009-08-26 2011-03-02 Black & Decker Inc Hammer drill with vibration damping means in handle
US20120048580A1 (en) * 2010-09-01 2012-03-01 Hilti Aktiengesellschaft Power tool
DE102010040173A1 (de) * 2010-09-02 2012-03-08 Hilti Aktiengesellschaft Handwerkzeugmaschine
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US9849577B2 (en) * 2012-02-03 2017-12-26 Milwaukee Electric Tool Corporation Rotary hammer
CN104114332B (zh) * 2012-03-22 2016-05-11 日立工机株式会社 冲击工具
CN205651293U (zh) * 2013-07-15 2016-10-19 米沃奇电动工具公司 旋转动力工具
EP2898992B1 (fr) * 2014-01-23 2016-05-04 Black & Decker Inc. Outil électrique avec poignée arrière, méthode d'assemblage d'une partie d'une poignée pour un outil électrique et méthode de démontage d'une partie d'une poignée pour un outil électrique
EP2898994A1 (fr) 2014-01-23 2015-07-29 Black & Decker Inc. Outil électrique avec une poignée arrière
EP2898993B1 (fr) 2014-01-23 2019-01-30 Black & Decker Inc. Outil electrique
EP2898991B1 (fr) * 2014-01-23 2018-12-26 Black & Decker Inc. Poignée arrière
WO2015166995A1 (fr) * 2014-04-30 2015-11-05 日立工機株式会社 Outil de travail
EP3028821A1 (fr) * 2014-12-03 2016-06-08 HILTI Aktiengesellschaft Procédé de contrôle pour une machine-outils portative
JP6620434B2 (ja) * 2015-06-12 2019-12-18 マックス株式会社 打撃工具
DE102017202371A1 (de) * 2017-02-15 2018-08-16 Robert Bosch Gmbh Handwerkzeugmaschine
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
EP3501750A1 (fr) * 2017-12-19 2019-06-26 Hilti Aktiengesellschaft Machine-outil portative à vibrations amorties
WO2019147919A1 (fr) 2018-01-26 2019-08-01 Milwaukee Electric Tool Corporation Outil à percussion
JP2022128006A (ja) * 2021-02-22 2022-09-01 株式会社マキタ 打撃工具

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Also Published As

Publication number Publication date
US20080022817A1 (en) 2008-01-31
JP2008030193A (ja) 2008-02-14
JP5426084B2 (ja) 2014-02-26
EP1882558A1 (fr) 2008-01-30
US7500527B2 (en) 2009-03-10
DE102006000374A1 (de) 2008-01-31

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