EP2097220B1 - Handwerkzeugmaschine für ein rotierendes werkzeug mit schutzhaube - Google Patents

Handwerkzeugmaschine für ein rotierendes werkzeug mit schutzhaube Download PDF

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Publication number
EP2097220B1
EP2097220B1 EP07803583A EP07803583A EP2097220B1 EP 2097220 B1 EP2097220 B1 EP 2097220B1 EP 07803583 A EP07803583 A EP 07803583A EP 07803583 A EP07803583 A EP 07803583A EP 2097220 B1 EP2097220 B1 EP 2097220B1
Authority
EP
European Patent Office
Prior art keywords
neck
protective hood
power tool
portable power
tool according
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
EP07803583A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2097220A1 (de
Inventor
Florian Esenwein
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2097220A1 publication Critical patent/EP2097220A1/de
Application granted granted Critical
Publication of EP2097220B1 publication Critical patent/EP2097220B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • Hand tool machines for rotating, preferably disc-shaped tools are known. They are used, for example, as angle grinders variously.
  • Protective hoods are provided in such hand tool machines which have the task of keeping the sparks and material particles being thrown away from the operator or from areas of the environment when working with the portable power tool by the rotating tool, for example grinding or cutting disks.
  • the guard should also protect the user and the environment in the event of destruction of the tool. It may happen, for example, that a cutting disc breaks in the workpiece when it is tilted there in the rotation. It must be ensured by the protective hood that fragments of the crushed cutting disc, which are thrown away with high energy sometimes, not reach the area of the operator.
  • the protective covers cover the workpiece only in segments, for example in an angular range of about 180 °, to leave the operator sufficient freedom of work on the rotating tool and workpiece.
  • it is known in the prior art to detachably secure the protective hood for example by means of a tensioning band arranged on the protective hood.
  • solutions are known in which the clamping band is expanded and reduced by loosening and tightening a clamping screw in the circumference, so that the protective hood is held by a clamping action on the machine neck.
  • the object of the invention is to present a development that allows greater protection for the operator of the power tool with greater comfort.
  • a hand tool machine for a rotating, preferably disc-shaped tool, with a machine housing having a machine neck to which a protective cover for at least partially covering the tool is releasably attached, wherein the protective hood has a guard neck and provided for releasably securing a clamp and wherein at least one recess for engagement of the engagement element is arranged / formed on the guard collar and on the guard neck and on the machine neck to form a rotation safeguard acting between the machine neck and the guard.
  • the protective hood is consequently a component which is separate from the hand tool machine, with the clamping clamp in turn being a separate component for the protective hood.
  • the guard has a guard neck which attaches to the machine housing is, in particular slipped over the engine neck formed on the machine housing and can be released from there again, and the clamp in turn serves to attach the protective hood neck.
  • the tension clamp has an engagement element which can cooperate with at least one recess on the guard neck or on the guard neck and on the machine neck. Upon engagement of this engagement element in the recess, a rotation of the guard on the machine neck is prevented because the engagement element passes through the guard neck, or passes through the guard neck and also engages in a formed on the machine neck recess, so that the guard neck over the engagement of the engagement member in the at least one recess is locked.
  • the clamp is formed as a separate component and fixed to the machine housing.
  • the separate training of the clamp and attachment to the machine housing frees the clamping hood of the clamping mechanism as such.
  • the clamping hood on the one hand easier to handle, on the other hand, this embodiment allows to use the clamp in a specific, defined manner and about to attach to the machine housing, regardless of the position of the protective hood relative to the machine housing.
  • the guard neck is encompassed by the clamp.
  • the clamp thus engages around the guard neck more or less completely, depending on the design of the clamp as a closed or open ring, and thus causes the determination of the guard over the attached guard neck.
  • the protective neck surrounds or partially engages around the machine neck.
  • the protective neck neck thus comprises the machine neck completely or at least partially. This allows extensive freedom in the manner in which the protective hood is to be arranged relative to the machine housing, in particular in the embodiment of partial encasement.
  • the machine neck and / or the guard neck has a compensating element, in particular a ring consisting of elastic material, in particular rubber, in order to compensate for tolerances between the guard neck and the machine neck.
  • a compensating element in particular a ring consisting of elastic material, in particular rubber, in order to compensate for tolerances between the guard neck and the machine neck.
  • the guard neck is designed as a ring element or as a ring segment element.
  • a ring element of the guard neck is arranged annularly on the protective hood, in particular concentric with the outer circumference of the circular segment, which is covered by the protective hood.
  • a ring segment element of the guard neck is only partially formed, so not as a solid ring, preferably in such a way that it covers the range in the angular range, which is also covered by the guard itself. This results in a particularly large freedom in arrangement and determination of the protective hood relative to the machine housing.
  • the clamping collar has a clamping device which reduces its diameter during clamping.
  • This clamping device can be configured for example by a screw with a corresponding mating thread, wherein the clamp is in turn designed as an open ring, which is closed by the clamping device.
  • the clamp has an engagement element and a clamping device. Engagement element and engaging means are therefore different.
  • the engagement element is used to fix the guard on the machine neck against axial rotation, whereas the clamping device causes a fixation in any respect, especially against slipping from the machine neck.
  • the clamping device is designed as a lever having the engagement element.
  • the circumferential enlargement and reduction of the clamp is thus carried out via a lever known from the prior art, which opens or closes the clamp designed as an open ring, but wherein the lever has the engagement element, the engagement element, in particular on the lever formed on the underside or on this is arranged.
  • the lever for fixing the engagement position of the engagement element is spring-loaded.
  • the arranged on the lever engaging element is therefore always engaged in the at least one recess, unless the lever is opened against its spring load. In this way, an unintentional adjustment or removal of the protective hood is not possible because it must be decidedly counteracted against the spring load, for example, but not necessarily, at the same time, the clamping device can be opened.
  • the engagement element is arranged on an engagement lever, and the tensioning device can be actuated via a tensioning lever.
  • the engagement element consequently has a separate engagement lever which operates exclusively the engagement element, without simultaneously actuating or displaying the tensioning device.
  • the clamping device is in this case actuated in another way, for example via a clamping lever.
  • the engagement element is a screw. This embodiment is particularly recommended for embodiments in which the protective hood is to be adjusted with a tool and / or where frequent adjustment of the guard relative to the machine housing is not required, so that the execution with a lever-operated engagement element is not required.
  • the anti-rotation device is provided by means of the engagement element and by means of a on the guard neck or on the guard neck and the machine neck arranged sequence of recesses designed as adjustable twisting the guard relative to the machine neck.
  • a twisting device of the protective cover can be formed relative to the machine neck and thus to the machine housing, in any position as dictated by the sequence of recesses.
  • the protective hood can be fixed by simple engagement of the engagement element in the respective recess.
  • the clamping clamp has at least one fastening tab, which preferably extends radially and serves for fastening to the machine housing.
  • a fastening tab may be formed integrally with the clamp or disposed thereon, in particular fixed; in a preferred embodiment it extends radially on the outside of the clamping collar and has a bore or other device in order to fix it and the clamping collar to the machine housing, wherein it is very particularly preferably fastened by screws to the machine housing, which is present anyway on the machine housing are, for example, with screws that hold a gear cover.
  • an at least partially circumferential securing groove is formed on the machine neck, which interacts with at least one Nuteingriffelement formed / arranged on the protective hood neck to form a captive securing the protective hood.
  • the Nuteingriffelement is therefore introduced when attaching the protective hood neck on the machine neck in the at least partially circumferential locking groove and thereby prevents the protective cover unintentionally detached from the machine neck and slips off.
  • the groove on a groove insertion in particular one which is substantially perpendicular to the groove, whereby the Nuteingriffelement when slipping the guard neck on the machine neck can be brought in the simplest way in the engagement of the groove.
  • the Nuteingriffelement is a cam or cam. Such are particularly easy to manufacture, which in a simple and inexpensive way training on the guard neck is possible.
  • FIG. 1 shows a protective cover 1 for a hand tool, not shown here, namely an angle grinder.
  • the protective cover 1 is configured in the manner of a pot section 2, with a protective cover bottom 3 and a protective cover edge 4.
  • the protective cover edge 4 is designed substantially as a ring section 5.
  • the one-sided adjoining this Guard floor 3 essentially describes a semicircle 6, wherein concentric with an imaginary center of the semicircle 6 a guard neck 7 is formed, which has a guard neck wall, which is substantially perpendicular to the guard base 3, and the guard neck 7 in turn semicircular around the imaginary center of the Semicircle 6 is formed.
  • the guard neck 7 is formed as a ring element 9.
  • the guard neck 7 has, distributed on its circumference 12, a sequence 13 of recesses 14 which are substantially equidistant, ie have the substantially same distance d between them. Starting from the imaginary center of the protective hood neck 7 (of the ring element 9) is determined by the sequence 13 of recesses 14, which have the distance d between each, a respective same angle (circle angle) ⁇ set.
  • FIG. 2 shows a machine neck 15 which is arranged on a Getriebeabdeckplatte 16, in particular integrally formed therewith.
  • the gear cover plate closes an angle gear 17 of a machine housing 18 of the power tool 19.
  • the machine neck 15 has a Maschinenhalswandung 20, in the outer peripheral side, a sequence of recesses 14 is introduced equally spaced.
  • the recesses 14 are formed as depressions 21, these consequently do not go through to a Maschinenhalsinnenseite 22 through.
  • the machine neck 15 assumes, not shown here, a tool spindle for receiving a tool which is to be covered by the protective hood, not shown here.
  • FIG. 3 shows the machine neck 15 and this encompassing guard neck neck 7 and this in turn encompassing clamping collar 23.
  • the clamping collar 23 has for coarse fixing or Siegfix ist a diameter-reducing clamping device 24; This is designed here in a simple manner as a screw tensioning device 25.
  • On the outer circumference of the clamp 23 is in bearing plates 26, a lever 27 with an end formed on this engaging element 28th rotatably mounted about a vertically disposed within the bearing plates 26 axis of rotation 29.
  • recesses 14 are arranged for cooperation, namely the engagement of the engagement element 28, which lie substantially at the same radii starting from an imaginary center of the machine neck 15 and thus include the same partial angle ⁇ .
  • the engagement element 28 can consequently penetrate the recesses 14, wherein the recesses 14 on the machine neck 15 as recesses 21, so not continuous, are formed, and thereby lock the guard neck 7 relative to the machine neck 15 and set.
  • By loosening, so excluding the engagement member 28 from the recesses 14 by operating an end portion 30 of the lever 27 of the guard neck 7 is rotatable within this arrangement, so that it is arranged at a different angular distance a relative to the other components and by releasing the lever 27 again can be locked.
  • the lever 27 is spring-loaded at its end portion 30, wherein a coil compression spring 31 is supported on a Hebelend Schemeunterseite 32 on the one hand and on an outer circumference 33 of the clamp on the other.
  • the lever 27 is by the spring force load of the coil spring 31 in a position such that the engagement element 28 engages through the recesses 14 in the recesses 21 and the guard neck is set relative to the other components.
  • the spring loading of the lever 27 may also be effected by other suitable spring designs, such as by gudgeon springs or the like.
  • the engagement element 28 forms in cooperation with the recesses 14 a rotation 34.
  • the anti-rotation 34 acts with the sequence 13 of recesses 14 as a rotating device 35, which can be adjusted by the sequence 13 predetermined angular positions of the protective cover 1 relative to the machine neck 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
EP07803583A 2006-11-13 2007-09-21 Handwerkzeugmaschine für ein rotierendes werkzeug mit schutzhaube Active EP2097220B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006053303A DE102006053303A1 (de) 2006-11-13 2006-11-13 Handwerkzeugmaschine für ein rotierendes Werkzeug mit Schutzhaube
PCT/EP2007/060046 WO2008058797A1 (de) 2006-11-13 2007-09-21 Handwerkzeugmaschine für ein rotierendes werkzeug mit schutzhaube

Publications (2)

Publication Number Publication Date
EP2097220A1 EP2097220A1 (de) 2009-09-09
EP2097220B1 true EP2097220B1 (de) 2010-06-23

Family

ID=38684249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07803583A Active EP2097220B1 (de) 2006-11-13 2007-09-21 Handwerkzeugmaschine für ein rotierendes werkzeug mit schutzhaube

Country Status (7)

Country Link
US (1) US7892075B2 (zh)
EP (1) EP2097220B1 (zh)
CN (1) CN101535001B (zh)
AT (1) ATE471788T1 (zh)
BR (1) BRPI0718535A2 (zh)
DE (2) DE102006053303A1 (zh)
WO (1) WO2008058797A1 (zh)

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US8702478B2 (en) * 2009-05-08 2014-04-22 Michael Loveless Angle grinder dust shroud with unitary adjustable mounting collar
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KR102360161B1 (ko) * 2017-05-29 2022-02-09 현대자동차주식회사 스핀들 장치 및 그의 작동방법
DE102017213747A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Schutzvorrichtung für eine Handwerkzeugmaschine
CN110000697B (zh) * 2018-01-04 2023-04-28 康普技术有限责任公司 箍套抛光夹具及抛光方法
USD945234S1 (en) * 2018-07-26 2022-03-08 Paul Mueller Company Guard for use with a power tool
JP7110025B2 (ja) * 2018-08-07 2022-08-01 株式会社マキタ 電動工具
EP3610992A1 (de) * 2018-08-13 2020-02-19 Hilti Aktiengesellschaft Baugruppe mit verliersicherer schraube
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US11123839B2 (en) * 2018-10-23 2021-09-21 Dustless Depot Llc Grinder dust shroud with input shaft gasket and adjustable mounting mechanism
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CN112548860B (zh) * 2020-11-26 2022-07-29 张旭斌 砂轮装置维修用防止输出轴违规启动的方法

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Also Published As

Publication number Publication date
ATE471788T1 (de) 2010-07-15
WO2008058797A1 (de) 2008-05-22
CN101535001A (zh) 2009-09-16
DE502007004221D1 (de) 2010-08-05
DE102006053303A1 (de) 2008-05-15
EP2097220A1 (de) 2009-09-09
US20090209184A1 (en) 2009-08-20
BRPI0718535A2 (pt) 2013-11-19
CN101535001B (zh) 2011-04-13
US7892075B2 (en) 2011-02-22

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