EP2119534B1 - Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube - Google Patents

Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube Download PDF

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Publication number
EP2119534B1
EP2119534B1 EP09158811A EP09158811A EP2119534B1 EP 2119534 B1 EP2119534 B1 EP 2119534B1 EP 09158811 A EP09158811 A EP 09158811A EP 09158811 A EP09158811 A EP 09158811A EP 2119534 B1 EP2119534 B1 EP 2119534B1
Authority
EP
European Patent Office
Prior art keywords
stop
electric tool
protective cover
wall
tool
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
EP09158811A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2119534A1 (de
Inventor
Helmut Schmied
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.)
Techtronic Industries GmbH
Original Assignee
AEG Electric Tools 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 AEG Electric Tools GmbH filed Critical AEG Electric Tools GmbH
Publication of EP2119534A1 publication Critical patent/EP2119534A1/de
Application granted granted Critical
Publication of EP2119534B1 publication Critical patent/EP2119534B1/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
    • 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
    • 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

Definitions

  • the present invention relates to a protective hood for a power tool and in particular an angle grinder and a power tool with such a protective hood.
  • an angle grinder is known to which a protective cover can be releasably attached.
  • the guard After mounting, the guard is in a limited angular range about a drive spindle of the power tool on which the tool (here a grinding wheel) is to be mounted, pivotable in different operating positions.
  • a plurality of evenly distributed along the pitch circle arc recesses are provided on a circular sector-shaped wall, which runs parallel to the bearing plate of the power tool along a coaxial to the drive spindle partial arc.
  • a retaining ring made of resilient sheet metal (spring steel) is attached to the bearing plate, which has a latching nose, which engages over the circular sector-shaped wall has.
  • This locking lug faces the bearing plate, ie facing the circular sector-shaped wall, a projection which can be brought into engagement with the corresponding recesses in the wall in order to be able to hold the protective hood in the corresponding operating position.
  • Such power tools must pass a burst test in accordance with IEC-EN60745-2-3. It is required that a protective cover from the in Fig. 1 not rotate more than 90 ° in the position shown in the present application if the grinding wheel breaks down during the burst test. This requirement could not be met by the stop lugs on the retaining ring formed from a resilient sheet metal. Rather, the retaining ring and / or the stop lugs tended to hug when striking the end face of the circular sector-shaped wall on the stop lug so that the guard could turn past the attacks over.
  • the present invention is therefore based on the object to provide a protective hood for a power tool and a power tool with such a protective cover, while maintaining the simple structure and the ability to attach the protective cover in the simplest manner on the power tool and to be able to solve again, as is known from the described prior art, the burst test according to IEC-EN60745-2-3 can exist.
  • the present invention is based on the idea to avoid a "skip" of the stop in the attack situation in that preferably the distance between the element which meets the stop and the free upper edge of the stopper is increased and a pocket is formed, the one prevents further movement of the element striking the stop over the free upper edge of the stop. It is in principle preferred to form the stop on the guard itself, which in comparison to the resilient retaining ring from the DE 44 23 889 C1 stiffer material, making the requirements for the burst test according to IEC-EN60745-2-3 easier to meet, without higher manufacturing costs and / or a complicated structure would result.
  • the protective hood of the present invention which is attachable to a power tool, in particular an angle grinder, such that it is pivotable in a limited angular range about a drive spindle of the power tool into different operating positions, a body having a circular sector-shaped wall.
  • the circular sector-shaped wall is semicircular and substantially at the center of the semicircle has a likewise semicircular recess through which the drive spindle of the power tool at least partially occurs in the state mounted on the power tool.
  • the body may preferably have the shape of a half pot. Ie.
  • On the radially outer peripheral side of the circular sector-shaped wall may be provided in the axial direction of the drive spindle projecting edge.
  • the circular sector-shaped wall may be bent in addition on its side facing away from the circular sector-shaped wall in the radial direction inwards.
  • the circular sector-shaped wall does not necessarily have to be linear in cross-section.
  • at least one, but preferably a plurality of axially projecting projections are provided concentrically to the semicircular recess along a partial arc, which protrude in the opposite direction, as the axially extending wall.
  • These projections can z. B. are generated by an embossing and engage the radial guidance of the guard in a provided in the power tool, in particular its bearing plate, provided annular groove.
  • these holding elements are preferably provided at a uniform interval along the pitch circle arc, preferably at 30 ° intervals. Preferably, between 4 and 6, most preferably 5, such retaining elements are provided.
  • the protective hood for limiting the pivoting movement in at least one and in particular in operation in the rear end portion of the partial arc in the direction of rotation of the drive spindle to an at least axially extending stop, which is preferably integrally formed with the protective hood or formed on this or profiled.
  • the counter element is mobile, in Which state further rotation of the guard in the direction of rotation of the drive spindle is limited.
  • this stop is provided to form a pocket with a leg extending toward the partial arc, so that the stop has a substantially "L" shape in section.
  • an elongated recess is provided along an extension of the partial arc, which ends at the stop or opens, said recess may be an extension of a holding element, when the holding elements are formed by recesses.
  • the recess can also be provided separately.
  • the counter-element should it be bent, prevented by the parallel to the circular sector-shaped wall extending leg at a further bending and thus the skipping.
  • the opening into the stop elongated recess or depression causes the preferably acted in the direction of the circular sector-shaped wall and oppressive against this counter element "swing" or spring and thereby without increasing the dimension of the stop in the axial direction of the distance between the counter element and the free upper edge (the end of the stop facing away from the circular sector wall) is increased, whereby the probability of a jump of the stop by the counter element is further reduced or even precluded.
  • the retaining elements in each case by a recess and in particular by an impression in the circular sector-shaped wall, so that on the side facing away from the end shield of the circular sector-shaped wall a recess and possibly on the opposite side forms a protrusion, in which case it is preferred that the recess provided closest to the abutment continues up to the abutment to form the elongated recess or recess.
  • the counter-element has a projection facing the circular-sector-shaped wall, which projection is configured corresponding to the recesses or recesses, in order to be able to be engaged and disengaged by pivoting the protective hood.
  • a further stop which, however, can be overrun by the counter element for simple mounting of the protective cover upon rotation of the protective cover in the direction of rotation of the drive spindle.
  • the counter element can run over the stop and after driving over the stop provides a limitation of the pivoting of the guard available.
  • To release the counter element may preferably with a simple tool, for. As a screwdriver, are slightly raised so that the guard manually past the counter element over or the other stop pivoted over and can be solved again by the power tool.
  • a second alternative embodiment of the present invention are preferably no attacks in provided at the end portions of the partial arc, but at least one stop fixedly disposed on the power tool, the stop strikes against an end face of the circular sector wall portion of the guard upon rotation of the guard in the rotational direction of the drive spindle, to form a pocket to the front of the wall extending leg have, so that similar advantages, as described above with respect to the pocket-shaped stop of the guard, can be achieved.
  • the in the Fig. 1 and 2 illustrated angle grinder which is an example of a power tool, in which the present invention can be used, comprises a housing 11 in which a not visible in the representations drive is housed. About this drive, a drive spindle 12 is rotated (here counterclockwise) to which a grinding wheel (not shown) can be fastened. The center axis M of the drive spindle 12 is in Fig. 1 indicated.
  • the drive spindle 12 is mounted in the housing 11.
  • the section supporting the drive spindle is covered by a bearing plate 13 connected to the housing 11.
  • End plate 13 is an annular groove 14 is formed, which is open in a front region 15 over an angular range of about 160 °.
  • a retaining ring 16 formed from an elastic material, in particular a spring plate, is fastened in the end shield 13 via screw connections 17.
  • This retaining ring 16 has a counter-element in the axial direction to the bearing plate 13 down slightly bent nose 18.
  • This nose 18 is provided with an impression 19, so that on the side of the lug 18 facing the bearing plate 13, a projection which is not visible in the drawings is formed.
  • the nose 18 is in the direction of the drive (motor) of the power tool 10, d. H. directed away from the front.
  • the protective hood according to the invention is integrally formed and has substantially the shape of a half pot, so that two corresponding protective covers 50 can be punched out of a round sheet metal pot.
  • the protective hood 50 has a circular-sector-shaped wall 51, which in the illustrated embodiment is semicircular, ie covers an angular range of 180 °.
  • This circular sector-shaped wall 51 extends substantially in the radial direction parallel to the bearing plate 13 and has a crank 52 in the radial direction, so that an axially lower portion 53 and a higher lying portion 54 are formed.
  • a circular (semicircular) recess is provided through which partially enters the drive spindle 12 in the mounted state, wherein the central axis M of the drive spindle and the central axis of the recess 55 and the circular sector substantially coincide, ie Elements are arranged concentrically with each other.
  • Radially closest to the recess 55 and also on a concentric to the central axis M arc of a plurality of indentations 56 from the side facing away from the bearing plate 13 side in the section 53 of the wall 51st introduced, so that a plurality of projections are formed on the bearing plate side facing.
  • the radius of the partial circular arc on which the indentations 56 are located corresponds to the radius of the annular groove 14, so that in the mounted state the projections generated by the indentations 56 for radial guidance of the protective hood can engage in the annular groove 14 (see below).
  • six such indentations 56 are provided, each three of which are grouped into a guide element.
  • a plurality of recesses 57 and the holding elements forming impressions are provided concentrically to the first part of the arc and radially outward thereto on the lower-lying portion 53.
  • five such recesses 57 four of which are designed the same, are provided.
  • the recess 57 continues to form an elongated recess 58.
  • This elongated recess 58 terminates at a stop 59.
  • the stop is composed of an axial leg 60 and a parallel to the wall 51 and the bearing plate and / or the nose 18 extending leg 61 and thereby forms a pocket 62. In section or in a radial plan view is this stop 59 in the form of an "L" (in Fig. 2 standing upside down).
  • a further stop 63 is provided, which is produced by a U-shaped cut in the portion 53 of the wall 51 and bending out of the material in the axial direction.
  • the protective cover 50 To mount the protective cover 50, the protective hood with the end face 66 of the wall 51 in the direction of the front of the power tool, ie in the direction of the motor, in Fig. 2 set from the front.
  • the annular groove 14 provided in the end plate 13 is open in this region at least over the portion in which the projections resulting from the indentations 56, ie the guide elements, are provided.
  • the projections can be attached to the guide groove 14 radially inwardly bounding wall 20.
  • the wall 51 between the retaining ring 16 and the bearing plate 13 is inserted.
  • the distance between the bearing plate 13 facing side of the retaining ring 16 and the top 21 of the bearing plate 13 is designed such that it corresponds at least to the thickness of the wall 51 of the protective cover 50.
  • the side of the stopper 63 which is connected to the region 53 of the wall 51, engages the nose 18.
  • the nose 18 slides over the stop 63.
  • the nose 18 is disposed between the stop 63 and the stop 59.
  • the protective cover 50 is bent in the axial direction by the slightly downward resilient nose 18 or the wall 51 cross-retaining ring 16 on the bearing plate 13 and power tool 10 held.
  • the protective cover 50 is pivotable between the stops 63 and 59 and can be pivoted into the individual operating positions which are predetermined by the recesses 57.
  • the above procedure is reversed.
  • the nose 18 can be briefly raised by means of a screwdriver, ie a simple tool, so that it can slide over the stop 63.
  • the protective hood in the relative to Fig. 2 180 ° rotated position shifted and can then be removed through the open front 15 of the annular groove 14 and pulled out of the space between the retaining ring 16 and bearing plate 13.
  • the protective cover 50 is carried along by the tool in the direction of the arrow 67, then the projection which is produced by the indentation 19 in the nose 18 moves first into the last recess 57 (the last or rearmost in the direction of rotation 67). Ie. the nose 18 springs in the direction of the bearing plate 13 (here down) and is thus placed in their position deeper or closer to the bearing plate, as if on the surface of the portion 53 of the wall 51st would slide.
  • the number of projections formed by the indentations 56 and the recesses 57 is not limited to those described above, but may be more or less provided. Furthermore, these elements need not be achieved by imprints, but can be generated in other ways. Finally, it is also conceivable instead of the recesses 57 to provide projections, in which case a corresponding depression would be provided instead of the projection formed by the indentations 19. In addition, it is also conceivable to guide the protective cover 50 in a different manner radially, although the illustrated embodiment is preferred for manufacturing and cost reasons.

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)
  • Sawing (AREA)
EP09158811A 2008-05-13 2009-04-27 Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube Active EP2119534B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008023324A DE102008023324A1 (de) 2008-05-13 2008-05-13 Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube

Publications (2)

Publication Number Publication Date
EP2119534A1 EP2119534A1 (de) 2009-11-18
EP2119534B1 true EP2119534B1 (de) 2010-06-23

Family

ID=40941782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09158811A Active EP2119534B1 (de) 2008-05-13 2009-04-27 Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube

Country Status (4)

Country Link
EP (1) EP2119534B1 (zh)
CN (1) CN101579852B (zh)
AT (1) ATE471789T1 (zh)
DE (2) DE102008023324A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3546124A1 (de) 2018-03-29 2019-10-02 HILTI Aktiengesellschaft Winkelschleifgerät
EP4324583A3 (en) * 2018-04-27 2024-07-10 Milwaukee Electric Tool Corporation Compact multi-material cut-off tool

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102441871B (zh) * 2010-10-01 2014-06-04 苏州宝时得电动工具有限公司 附件及动力工具
JP5579575B2 (ja) * 2010-11-02 2014-08-27 株式会社マキタ ディスクグラインダ
JP5760658B2 (ja) * 2011-04-29 2015-08-12 日立工機株式会社 携帯型作業機
KR102414014B1 (ko) * 2018-01-11 2022-06-27 윤옥 절삭 휠 탈부착장치
CN110524042A (zh) * 2018-05-25 2019-12-03 南京德朔实业有限公司 角磨机
JP2020006483A (ja) * 2018-07-09 2020-01-16 株式会社マキタ 電動工具
CN111791190A (zh) * 2019-04-03 2020-10-20 南京德朔实业有限公司 多功能电动工具
CN116133813A (zh) * 2021-08-06 2023-05-16 百得有限公司 具有护罩的圆锯
CN114683145B (zh) * 2022-05-10 2023-05-12 浙江金智达机电有限公司 一种角磨机
CN114683146B (zh) * 2022-05-10 2023-04-04 广东英基精密科技有限公司 一种自吸尘角磨机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423889C1 (de) 1994-07-07 1995-06-22 Atlas Copco Elektrowerkzeuge Schutzhaube für eine Handwerkzeugmaschine
SE507264C2 (sv) * 1996-06-13 1998-05-04 Atlas Copco Tools Ab Handhållet motordrivet verktyg
DE19914855B4 (de) 1999-04-01 2004-04-22 Metabowerke Gmbh Handschleifmaschine mit einer in Umfangsrichtung verstellbaren Schutzhaube
DE10115635C1 (de) * 2001-03-23 2002-10-24 Flex Elektrowerkzeuge Gmbh Handwerkzeugmaschine mit einer Schutzhaube
DE10225051A1 (de) * 2002-06-06 2004-01-08 Robert Bosch Gmbh Einsatzwerkzeug mit einer Befestigungseinheit
DE10348395A1 (de) 2003-10-17 2005-05-19 Robert Bosch Gmbh Schutzhaube für eine Elektrowerkzeugmaschine, Elektrowerkzeugmaschine sowie System mit Schutzhaube und Elektrowerkzeugmaschine
US20070117499A1 (en) * 2005-11-23 2007-05-24 Sunmatch Industrial Co., Ltd. Rotary protecting hood of a pneumatic grinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3546124A1 (de) 2018-03-29 2019-10-02 HILTI Aktiengesellschaft Winkelschleifgerät
EP4324583A3 (en) * 2018-04-27 2024-07-10 Milwaukee Electric Tool Corporation Compact multi-material cut-off tool

Also Published As

Publication number Publication date
ATE471789T1 (de) 2010-07-15
EP2119534A1 (de) 2009-11-18
CN101579852B (zh) 2013-06-12
CN101579852A (zh) 2009-11-18
DE502009000034D1 (de) 2010-08-05
DE102008023324A1 (de) 2009-11-19

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