EP2724816B1 - Machine-outil motorisée, en particulier meuleuse d'angle ou meuleuse droite - Google Patents

Machine-outil motorisée, en particulier meuleuse d'angle ou meuleuse droite Download PDF

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Publication number
EP2724816B1
EP2724816B1 EP13180384.3A EP13180384A EP2724816B1 EP 2724816 B1 EP2724816 B1 EP 2724816B1 EP 13180384 A EP13180384 A EP 13180384A EP 2724816 B1 EP2724816 B1 EP 2724816B1
Authority
EP
European Patent Office
Prior art keywords
switch
lever
shift
switching
housing
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
EP13180384.3A
Other languages
German (de)
English (en)
Other versions
EP2724816A3 (fr
EP2724816A2 (fr
Inventor
Matthias Hiller
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2724816A2 publication Critical patent/EP2724816A2/fr
Publication of EP2724816A3 publication Critical patent/EP2724816A3/fr
Application granted granted Critical
Publication of EP2724816B1 publication Critical patent/EP2724816B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/02Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/04Levers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION 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
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02Construction of casings, bodies or handles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028Angle tools
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H15/00Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/24Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch having a single operating part only protruding from one side of the switch casing for alternate pushing and pulling
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02Bases, casings, or covers
    • H01H9/06Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner

Definitions

  • the present invention relates to a driven machine tool, in particular an angle grinder or a straight grinder, comprising a drive unit with a drive switch designed as a cube switch or pressure switch for switching the drive unit on and off, a housing in which the drive unit is at least partially accommodated, and an actuating mechanism to operate the drive switch.
  • the actuating mechanism known from the prior art comprises a switching slide or a switching rod which is actuated with a switching button or actuating section which is accessible to the user from the outside and which is displaced relative to the housing.
  • a section of the shift rod which is angled at right angles to the longitudinal axis of the shift rod presses on the drive switch, as a result of which the latter is displaced and activated.
  • Such an angled shift rod has the advantage of providing a particularly simple actuation mechanism.
  • the use of such an angled switching rod in devices that are used in a working environment in which there is a high proportion of dust particles in the ambient air, which can possibly penetrate into the housing has proven to be a disadvantage in practice. This is because the dust particles can accumulate in the area of the actuating mechanism, as a result of which the shift rod may be impeded in its shifting movement and thus become difficult to shift. This is also due in particular to comparatively high transverse forces that have to be applied via the angled section of the switching rod so that the drive switch can be shifted to switch on.
  • German patent specification DE 35 40 652 C2 known in connection with an electric screwdriver to provide an actuating mechanism in which pressing the tool in one direction moves a switching rod in the same direction, which in turn pivots a double lever to move a pin against the biasing force of a compression spring and thereby an electric switch to close.
  • an actuation section in which the user initiates the shifting of the shift rod, can be dispensed with.
  • a power tool having a device body arranged in a housing and a handle, with a switch being arranged in the handle.
  • This switch should be connected indirectly to a switching element arranged in the device body for actuating an electrical on/off switch.
  • a Bowden cable is provided for this purpose.
  • the lever-shaped switching element has an upper and a lower lever arm and is mounted pivotably about a pivot point, with one end of the Bowden cable being connected to the lower lever arm of the switch.
  • a pawl is provided for switching, which is connected to the other end of the Bowden cable and can be displaced in a translatory manner during a switching movement.
  • a pivotable operating lever for operating a switch is also known, which can be pivoted about a bearing point and also pivots an intermediate lever coupled thereto, which actuates the switch.
  • WO 2005/062322 A1 which forms the basis for the preamble of claim 1, is also a power tool with a device side removable supply unit for electrical voltage supply is known, which has an at least indirectly operable switch for switching on and off a drive motor.
  • a decoupling device is provided to decouple the switch and a switching means that at least partially actuates the switch.
  • One object of the present invention is to further develop the known mechanism with an angled switching rod in such a way that safe switching on and off of the machine tool is ensured even in a working environment with a high level of dust.
  • the present invention proposes a driven machine tool, in particular an angle grinder or a straight grinder, with the features of claim 1 .
  • the actuating mechanism has a shift rod which can be displaced along the longitudinal axis of the housing and which protrudes with an actuating section through a recess in the housing, and a shift lever which is pivotably mounted in a bearing point and has at least one lever arm.
  • the shift rod is also coupled to the at least one lever arm according to the invention and is able to pivot it as a result of its displacement.
  • the shift lever can be pivoted toward the drive switch and pushes it to turn on, or pivoted away from it, allowing turning off.
  • the shift lever has at least one lever arm, which extends from its bearing point to the point at which the force is applied or introduced, at which the shift rod is coupled to the at least one lever arm.
  • a double-armed shift lever can also be useful.
  • the point of force application or point of force application on the shift rod is shifted in the direction of the actuation axis.
  • This results in significantly lower transverse forces, which have to be absorbed by the bearing.
  • the switching forces can be greater and the switch can be made safer as a result of the leverage.
  • the actuation force is reduced by the provision of the switching lever, so that even if the switching rod becomes more difficult to move due to dust or dirt accumulating, the operator does not have to exert any significant force to switch the driven machine tool on or off.
  • the leverage on the shift rod results in a larger stroke, which in turn is advantageously able to convey the dust that collects to non-critical areas.
  • a commercially available switch a so-called cube switch or pressure switch, is used as the drive switch. This is a switch geometry that is offered by a large number of different manufacturers and is already used in commercially available machine tools.
  • the present invention is consequently used together with a drive switch that is already known, which has the advantage of being able to be retrofitted in machine tools that have already been developed.
  • a further advantage can be seen in the fact that the use of an existing drive switch means that the development and production costs for the drive switch remain the same, while the invention provides improved switchability of the machine tool.
  • the invention provides that the bearing point of the shift lever is arranged on the housing. This enables a particularly simple assembly of the shift lever.
  • the shift rod can be coupled to the at least one lever arm at a free end of the shift lever.
  • the free end of the coupled lever arm may be received in a recess on the shift rod.
  • the shift lever can have a rounded outer contour at the free end of the coupled lever arm, and the recess on the shift rod can have a substantially corresponding contour.
  • the figure schematically shows a partially sectioned plan view of the interior of a housing of a machine tool according to the invention.
  • the machine tool according to the invention is only partially shown in the figure and is generally denoted by reference numeral 10 .
  • a housing which extends along a longitudinal axis L and can be composed of several housing parts, for example in the form of a pot.
  • a part of the housing has been removed in the handle area 12 in order to enable a view of the interior of the housing.
  • the machine housing is designated generally by the reference numeral 14 independently of the housing part shown.
  • a drive switch 16 which serves to switch a drive unit 18 on and off can be seen in the interior of the housing 14 .
  • the drive switch 16 is designed as a pressure switch which is preloaded in its off position by an integrated compression spring (not shown).
  • an integrated compression spring not shown.
  • the actuating mechanism 22 for actuating the drive switch 16 includes a switching rod 24 and a switching lever 26.
  • the switching rod 24 takes on the task of redirecting an actuating movement by the user from the outside of the housing to the inside.
  • the switching rod 24 has an actuating section (not shown) which protrudes through a recess in the housing 14 .
  • This operating section can be pushed forwards or backwards in the longitudinal direction L by a user in the handle area 12 within the recess of the housing in a known manner in order to switch the machine tool on or off.
  • a displacement of the shift rod 24 in the direction of the longitudinal axis L is effected by displacement of the actuating section.
  • the shift lever 26 takes over among other things, the task of converting the translational displacement of the shift rod 24 into a pivoting movement, as a result of this pivoting movement of the drive switch 16, which is in contact with the shift lever 26, is pressed in direction A.
  • the shift lever 26 shown has a single lever arm which extends from the bearing point 28 on the housing 14 to the point 30 of force application.
  • the force introduction point 30 is the point at which the shift rod 24 is coupled to the shift lever 26 and consequently a compressive or tensile force is introduced into the shift lever 26 .
  • the shift lever 26 is rounded at its free end.
  • the associated recess 32, in which the free end of the shift lever 26 is received, has a corresponding contour.
  • the shift lever 16 touches the drive switch 16 in the area of a contact point 34 at least during its pivoting movement in the direction of the drive switch, with the shift lever 26 exerting a compressive force on the drive switch 16 .
  • the contact point 34 is arranged at a smaller distance from the bearing point 28 than the force application point 30. Based on the general principle of moment equilibrium on a lever, this results in a force transmission in which the force introduced by the shift rod 24 is lower by the factor than the compressive force exerted on the drive switch 16 by which the distance from the contact point 34 to the bearing point 28 is smaller than the distance from the force application point 30 to the bearing point 28.
  • the shift lever 26 and the shift rod 24 do not have to be firmly connected to one another. It is sufficient if the shift rod 24 is coupled to the shift lever in this way is that its translational movement causes the shift lever 26 to pivot.

Claims (4)

  1. Machine-outil entraînée (10), en particulier meuleuse d'angle ou meuleuse droite, comprenant une unité d'entraînement (18) avec un interrupteur d'entraînement (16) réalisé sous la forme d'un interrupteur cubique ou d'un interrupteur à pression pour la mise en marche et l'arrêt de l'unité d'entraînement (18), un boîtier (14) dans lequel l'unité d'entraînement (18) est logée au moins partiellement, ainsi qu'un mécanisme d'actionnement (22) pour actionner l'interrupteur d'entraînement (16),
    le mécanisme d'actionnement (22) présentant une tige de commutation (24) pouvant être déplacée le long d'un axe longitudinal (L) du boîtier (14), qui traverse avec une section d'actionnement un évidement du boîtier (14), ainsi qu'un levier de commutation (26), qui est logé de manière pivotante dans un point d'appui (28) et présente au moins un bras de levier,
    la tige de commande (24) étant couplée à l'au moins un bras de levier et pouvant faire pivoter celui-ci suite à son déplacement,
    caractérisé en ce que le point d'appui (28) du levier de changement de vitesse (26) est disposé sur le boîtier (14),
    que le levier de commutation (26), au moins lors de son mouvement de pivotement en direction du commutateur d'entraînement (16), touche le commutateur d'entraînement (16) sur une surface extérieure tournée vers le levier de commutation (26) dans la zone d'un point de contact (34),
    en ce que l'interrupteur d'entraînement (16) peut être pressé pour la mise en marche par pivotement du levier de commutation (26) en direction de l'interrupteur d'entraînement (16), et en ce qu'une mise à l'arrêt est rendue possible par pivotement d'éloignement du levier de commutation (26).
  2. Machine-outil (10) selon la revendication 1,
    la tige de commande (24) étant couplée à une extrémité libre du levier de commande (26) avec l'au moins un bras de levier.
  3. Machine-outil (10) selon la revendication 2,
    dans laquelle l'extrémité libre du bras de levier couplé est reçue dans un évidement (32) de la tige de commande (24).
  4. Machine-outil (10) selon la revendication 3,
    dans lequel le levier de changement de vitesse (26) présente un contour extérieur arrondi à l'extrémité libre du bras de levier couplé et l'évidement (32) sur la tige de changement de vitesse présente un contour sensiblement correspondant.
EP13180384.3A 2012-08-23 2013-08-14 Machine-outil motorisée, en particulier meuleuse d'angle ou meuleuse droite Active EP2724816B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012215025.0A DE102012215025A1 (de) 2012-08-23 2012-08-23 Angetriebene Werkzeugmaschine, insbesondere Winkelschleifer oder Geradschleifer

Publications (3)

Publication Number Publication Date
EP2724816A2 EP2724816A2 (fr) 2014-04-30
EP2724816A3 EP2724816A3 (fr) 2018-01-03
EP2724816B1 true EP2724816B1 (fr) 2022-09-28

Family

ID=49035304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13180384.3A Active EP2724816B1 (fr) 2012-08-23 2013-08-14 Machine-outil motorisée, en particulier meuleuse d'angle ou meuleuse droite

Country Status (3)

Country Link
US (1) US20140054146A1 (fr)
EP (1) EP2724816B1 (fr)
DE (1) DE102012215025A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014105107A1 (de) * 2014-04-10 2015-10-15 Metabowerke Gmbh Schalteranordnung für eine angetriebene Handwerkzeugmaschine
US9889536B2 (en) 2015-12-31 2018-02-13 Brett George Bradshaw Angle grinder control systems
CN114289990A (zh) * 2021-12-28 2022-04-08 武汉纳瑞格智能设备有限公司 窄间隙焊缝的缺陷修复方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413428A (en) * 1966-10-17 1968-11-26 Square D Co Pressure switch with time delay
CH653280A5 (de) * 1981-10-08 1985-12-31 Ceka Elektrowerkzeuge Ag & Co Schaltvorrichtung fuer den antriebsmotor eines elektrowerkzeuges.
JPS61121877A (ja) 1984-11-16 1986-06-09 松下電器産業株式会社 電動ドライバ−
DE19544279C1 (de) * 1995-11-28 1997-01-16 Schulte Elektrotech Elektrischer Schalter
DE10360249A1 (de) * 2003-12-20 2005-07-21 Robert Bosch Gmbh Elektrowerkzeugmaschine
DE102005021731A1 (de) * 2005-05-11 2006-11-16 Robert Bosch Gmbh Elektrowerkzeugmaschine
DE102007025009A1 (de) 2007-05-30 2008-12-04 Robert Bosch Gmbh Stator einer elektrischen Maschine, elektrische Maschine sowie Elektrowerkzeugmaschine
DE202011108753U1 (de) * 2011-12-06 2012-01-24 Gardena Manufacturing Gmbh Handgeführtes Gerät mit einem Bedienungshebel

Also Published As

Publication number Publication date
DE102012215025A1 (de) 2014-02-27
EP2724816A3 (fr) 2018-01-03
US20140054146A1 (en) 2014-02-27
EP2724816A2 (fr) 2014-04-30

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