EP2464494A1 - Werkzeugmaschine mit einer schutzhaube - Google Patents
Werkzeugmaschine mit einer schutzhaubeInfo
- Publication number
- EP2464494A1 EP2464494A1 EP10724080A EP10724080A EP2464494A1 EP 2464494 A1 EP2464494 A1 EP 2464494A1 EP 10724080 A EP10724080 A EP 10724080A EP 10724080 A EP10724080 A EP 10724080A EP 2464494 A1 EP2464494 A1 EP 2464494A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- machine tool
- stop
- flange
- tool according
- clamping
- 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.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 63
- 238000013016 damping Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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 invention relates to a machine tool, in particular a machine tool
- Angle grinder with a tool covering protective hood, according to the preamble of claim 1.
- a machine tool with a rotating tool in the form of a grinding wheel is known, which is overlapped by a protective hood, which is fastened to a machine-side flange.
- the protective cover has a clamping collar, which can be placed on the flange and is fastened to the flange by means of a clamp.
- the guard can be fixed in different angular positions on the flange. To change the angular position, the clamp is loosened, after which the guard can be pivoted to the desired position.
- the pivoting range is limited to a defined angle range;
- a stop device is arranged on the machine tool, consisting of a projection on the clamp and a counterpart on the housing of the machine tool.
- the clamp forms with the guard a common component, so that upon rotation of the guard and the clamp is rotated until it reaches the counterpart on the housing of the machine tool.
- the one-piece design of the clamp and protective cover is a relatively complex design. Moreover, this embodiment is not suitable, in the event of breakage of the disk-shaped tool, reliably limiting the rotation of the protective hood to a maximum permissible angular amount. Due to the relatively large mass of the guard consists of
- the invention has for its object to increase safety in the event of tool breakage on a machine tool.
- the machine tool according to the invention is preferably a hand-held machine tool, in particular an electric hand tool such as an angle grinder whose tool is at least partially covered by a protective hood, which is provided with a clamping collar whose axis of rotation is coaxial with the central axis of the tool shaft.
- the clamping collar is provided, for example, cylindrical or faceted with continuous or closed or perforated or segmented lateral surface.
- the clamping collar of the guard is attached to a machine-side flange, which has a contact surface for the clamping collar for this purpose.
- about the clamping device of the clamping collar with a radial clamping force against the contact surface on the machine side flange is subjected to force. Furthermore, in the transmission path between the guard and the
- the Flange provided a stop device which limits the relative rotational movement between the guard and flange to an acceptable level.
- the stop device comprises a stop element on the protective hood which, in the stop position, rests against an assigned counterpart on the flange or a component connected to the housing of the machine tool.
- the protective hood and the clamping device are designed here as separate components.
- the guard and the tensioning device - usually a tension clamp - separate components, so that the protective hood without radio tion loss can be made easier.
- the clamping device as a separate component acts on the protective cover in the region of the clamping collar and presses it against the contact surface on the machine-side or housing-side flange of the machine tool.
- the stop element is arranged directly on the protective hood, whereby on the one hand it is ensured that the stop element lies at a sufficient distance from the axis of rotation through the clamping collar of the protective hood and thus at a given moment lower forces on the stop element Act.
- the functionality of the stop device is ensured independently of the clamping device, so that even in the case of failure of the clamping device, the protective cover can only be turned until reaching the stop.
- the protective hood in a neutral working position in the direction of rotation has a twisting area up to the stop of the stop device.
- the neutral working position is defined by parallel alignment of the symmetry axis of the hood body with the armature longitudinal axis of the electric drive motor. Starting from this neutral working position, there is expediently a turning range of a maximum of 60 ° in the direction of rotation of the tool.
- the protective hood is thus arranged in its neutral working position at a distance from the stop, so that the stop is effective only when the guard is pivoted about the allowable angle of rotation.
- the stop element is arranged on a hood body of the protective hood, which engages over the tool of the machine tool.
- the hood body is formed part-circular in the rule, wherein the stop member advantageously protrudes angularly at an end edge of the hood body and extends in particular in the axial direction.
- the stop element is expediently formed integrally with the protective hood.
- the stop element is arranged on the clamping collar of the protective hood and in particular is designed in one piece with the clamping collar.
- the stop element protrudes, for example, angularly on the clamping collar, such that a portion of the stop element extends parallel to the outer wall of the clamping collar in the axial direction.
- a design as a stop hook on the outer wall of the clamping collar, wherein a section of the stop hook extends in the circumferential direction of the clamping collar.
- the counterpart is arranged according to a first advantageous embodiment of the clamping device, which serves for clamping the clamping collar of the protective hood on the flange.
- the clamping device is advantageously positively or non-positively secured against rotation on the flange. This is done for example by screwing the clamping device on the flange or on the housing or another machine-side component.
- the counterpart is formed, for example, on an actuating device which serves to clamp the clamping device. According to a further embodiment it is provided that the counterpart on
- Flange or is arranged on the housing of the machine tool.
- the counterpart is designed, for example, as a component protruding beyond the lateral surface of the flange, which component lies in the path of rotation of the stop element, which is formed on the protective hood.
- the counterpart is designed as the end of a receiving groove, in which the stop element protrudes on the protective hood.
- the stop element can be pivoted so far in the receiving groove until the counterpart forming groove end is reached.
- the stop device comprises a damping element.
- the damping element absorbs rotational energy of the protective hood and thereby leads to a reduction of the pulse at the moment of striking the stop element on the counterpart.
- the damping element is either carried out in one piece with one of the stop partners or as a separate component, which is integrated in the stop travel between stop element and counterpart.
- Basically come spring elements, rubber elements or other components as damping elements into consideration, which are suitable due to their structural design or their material properties to absorb energy.
- the flange is provided on its collar with a profiling on which the inside of the clamping collar of the protective hood with corresponding profiling rests positively.
- Fig. 1 is a perspective view of a trained as angle grinder machine tool, with a grinding wheel and a protective hood in
- Fig. 2 in an individual view of a machine-side flange with a clamp and a protective hood, which is placed with its clamping collar on the flange, wherein the hood body of the protective hood
- Fig. 4 shows an embodiment with a hook-shaped stop element on
- FIG. 6 shows a detail of the machine-side flange with counterpart arranged thereon;
- FIG. 7 shows a further embodiment of a flange with a receiving groove provided at the foot of the flange for receiving a stop element on the protective hood;
- Fig. 8 is an illustration of a screwed on the gear housing of the machine tool clamp.
- the same components are provided with the same reference numerals.
- the hand-held power tool 1 shown in FIG. 1 is an angle grinder with an electric drive motor in a housing 2, wherein the drive movement of the electric drive motor via a transmission
- the hand tool 1 has a protective hood 6, consisting of an at least approximately semicircular hood body 7, which is approximately parallel to the grinding wheel 5 in the mounted position, a clamping collar 8 and a peripheral edge region 9 on the hood body 7.
- the hood body 7, the clamping collar 8 and the edge region 9 are made in one piece.
- the protective cover 6 is detachably connected to the power tool 1.
- An angular stop element 10 is integrally formed in the region of an end edge of the hood body 7; the stop element is located radially in the region between the clamping collar 8 and the radially outer edge region 9.
- the stop element 10 bent at an angle extends at least approximately in the axial direction of the output shaft 4.
- the clamping collar 8 In the mounted position, the clamping collar 8 is pushed with the protective cover 6 on a machine-side flange 1 1 with a flange neck, which has a cylindrical outer surface, which forms a contact surface 12 for the clamping collar 8.
- a clamp 13 is provided, which is placed around the clamping collar 8 and a screw 14, which forms an actuating device, is put under tension, so that the clamping collar 8 of the clamp 13 with a radial clamping force against the contact surface 12 on the flange 1 1 is pressed.
- an actuating device for clamping the clamping device is also a
- the stop element on the protective hood 6 is located on the side facing away from the edge region 9 and together with a radially outwardly directed, the screw 14 receiving portion of the clamp 13 forms a
- Stop device for limiting the rotation of the guard to the Axle of the output shaft 4.
- the radially outwardly facing, the screw 14 receiving portion here forms a counterpart 15 to the stop element 10;
- the stop element 10 comes into contact with the head of the screw 14, so that the screw 14 as an actuating device of the clamping clip in the broader sense also for Counterpart 15 can be expected.
- the stop element 10 In the neutral working position, the stop element 10 is located on the protective hood 6 at a distance from the counterpart 15 on the clamp 13.
- the angular distance is a maximum of 60 °. In the case of a high force on the protective cover 6, this can rotate about the axis of the output shaft 4 on the flange 1 1 until the stop element 10 comes into contact with the counterpart 15 on the clamp 13. When the stop is reached, further rotation of the guard against the flange is ruled out.
- Fig. 2 the protective cover 6 and the flange 1 1 are shown again in detail.
- the stop element 10 on the front end edge of the hood body 7 is located radially approximately in the middle between the clamping collar 8 and the outer edge region 9.
- the stop element 10 extends in the axial direction so far that on the one hand a secure system lying on the axially below the guard Counterpart 15 on the clamp 13 is possible and on the other hand, the guard 7 in the event of a high external force until the stop can be freely pivoted on the flange 1 1.
- a variant is shown, in which the stop element is integral with the clamping collar 8 on the protective cover 6 is executed.
- the stop element 8 is formed angularly and connected to the edge region 9 facing end side with the clamping collar 8. A portion of the stop element extends from the end side, starting in the axial direction and is located at a radial distance from the outer surface of the clamping collar. 8
- the stop element 10 is integrally formed with the outer wall of the clamping collar 8 on the protective cover 6.
- the stop element 10 forms a stop hook, wherein the free hook portion is at a radial distance from the outer surface of the clamping collar 8 and extends at least approximately in the circumferential direction.
- the counterpart to the stop element 10 forms a Schellennut 16, which is introduced into the clamp 13 and extends in the circumferential direction.
- the stop is formed by the groove end of the clip groove in which the stop element 10 is guided.
- struts 17 extending in the axial direction are provided, which engage over the clamp groove 16.
- the struts 17 are arcuate in order to allow a collision-free sliding along the Anschlagselemen- tes 10 in the Schell groove 16.
- the clip groove 16 tapers toward the groove end to decelerate the guard movement prior to reaching the groove end.
- the stop element 10 guided in the clamp groove experiences a clamping force which causes the braking operation due to the swelling clip groove.
- a braking in a relative rotational movement of the protective cover 6 about the axis of the output shaft 4 can also be achieved that the Schellennut 16 is not at a constant distance to the foot of the flange 1 1, but reduced towards the Nutende towards the axial distance to the Flanschfuß, so that with increasing rotation of the protective cover 6, the lower end face of the clamping collar 8 rests on the flange and is braked there due to the resulting frictional force. Even by changing the radial distance of the Schellennut to the contact surface of the flange braking can be achieved.
- the clamp 13 is carried out in a conventional manner and is attached to its radially projecting collar via the screw 14 on the contact surface 12 of the flange 1 1.
- the leadership of the protective hood via a flange groove 18, which is introduced in the region of the contact surface 12 in the flange 1 1.
- a flange groove 18 which is introduced in the region of the contact surface 12 in the flange 1 1.
- In the upper section of the Flange 1 1 is an axially extending insertion opening 19, which extends from the upper end face of the flange to the flanged groove 18.
- a radially inwardly directed stop element is formed on the inner side of the clamping collar, for example a pin which is slid axially over the insertion opening 19 onto the flange 11 until the flange groove 18 is reached.
- the pin slides in the flange groove 18 along and moves away from the axial insertion opening 19, whereby an axial locking is achieved.
- the twisting movement of the protective hood is limited by stops in the flange groove 18, in particular by the groove end of the flange groove 18.
- an element 15 is arranged as a counterpart to the stop element on the protective hood on the axial end face of the flange 1 1 within the radius of the contact surface 12.
- the associated stop element on the protective cover is expediently located on the inner side of the clamping collar.
- a groove 20 is introduced into the foot region of the flange 11, into which protrudes an axially projecting stop element on the protective hood, in particular on the front side of the clamping collar. Upon rotation of the protective cover, the stop element can travel in the groove 20 until reaching the groove end, which forms the counterpart.
- the radially projecting collar of the clamp 13 and designed as a screw 14 actuator for clamping the clamp forms the counterpart 15 to the stop element on the guard.
- the screw 14 is screwed to the gear housing 21 of the machine tool, so that the clamp 13 is immovably fixed to the housing of the machine tool and ruled out a relative rotation of the clamp around the contact surface of the flange 1 1 even with a high force in the event of pivoting of the guard is.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Sawing (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910028404 DE102009028404A1 (de) | 2009-08-10 | 2009-08-10 | Werkzeugmaschine mit einer Schutzhaube |
PCT/EP2010/058123 WO2011018254A1 (de) | 2009-08-10 | 2010-06-10 | Werkzeugmaschine mit einer schutzhaube |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2464494A1 true EP2464494A1 (de) | 2012-06-20 |
EP2464494B1 EP2464494B1 (de) | 2016-03-30 |
Family
ID=42340772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10724080.6A Active EP2464494B1 (de) | 2009-08-10 | 2010-06-10 | Werkzeugmaschine mit einer schutzhaube |
Country Status (7)
Country | Link |
---|---|
US (1) | US9085063B2 (de) |
EP (1) | EP2464494B1 (de) |
JP (1) | JP5518192B2 (de) |
CN (1) | CN102470503B (de) |
DE (1) | DE102009028404A1 (de) |
RU (1) | RU2550443C2 (de) |
WO (1) | WO2011018254A1 (de) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5544867B2 (ja) * | 2009-12-21 | 2014-07-09 | 日立工機株式会社 | グラインダ |
CN103158071B (zh) * | 2011-12-14 | 2016-03-09 | 株式会社牧田 | 研磨机 |
JP5959421B2 (ja) * | 2011-12-14 | 2016-08-02 | 株式会社マキタ | グラインダ |
DE102011089758A1 (de) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Schutzhaubenverdrehsicherungsvorrichtung |
DE102012214834A1 (de) * | 2012-08-21 | 2014-02-27 | Robert Bosch Gmbh | Schutzhaubenvorrichtung |
WO2014047122A1 (en) * | 2012-09-18 | 2014-03-27 | Ingersoll-Rand Company | Grinding tools with guards |
KR101625449B1 (ko) | 2015-03-31 | 2016-05-31 | 계양전기 주식회사 | 그라인더 휠가드의 고정구조 |
JP6667236B2 (ja) | 2015-09-10 | 2020-03-18 | 株式会社マキタ | グラインダ、カバー及びカバーセット |
JP6571463B2 (ja) | 2015-09-10 | 2019-09-04 | 株式会社マキタ | グラインダ、及びカバー |
JP6632840B2 (ja) * | 2015-09-10 | 2020-01-22 | 株式会社マキタ | グラインダ |
JP6634248B2 (ja) | 2015-09-10 | 2020-01-22 | 株式会社マキタ | グラインダ及びカバー |
DE102016106782A1 (de) * | 2016-04-13 | 2017-10-19 | Festool Gmbh | Hand-Werkzeugmaschine mit einer Abdeckeinrichtung |
KR102252775B1 (ko) * | 2016-09-12 | 2021-05-14 | 현대중공업지주 주식회사 | 도장로봇 |
JP6307787B1 (ja) * | 2017-05-26 | 2018-04-11 | 株式会社ナカヤ | ガード装着機構 |
JP6982991B2 (ja) | 2017-06-20 | 2021-12-17 | 株式会社マキタ | グラインダ |
JP7001491B2 (ja) * | 2018-02-23 | 2022-01-19 | 株式会社マキタ | 電動工具 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU716792A1 (ru) | 1978-04-07 | 1980-02-25 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента, Вибраторов И Строительно-Отделочных Машин | Виброизолированна ручна машина |
CS222119B1 (en) | 1981-03-10 | 1983-04-29 | Borivoj Prazsky | Protective cover of the grinding disc |
DE3940584A1 (de) | 1989-12-08 | 1991-06-13 | Bosch Gmbh Robert | Schutzhaube fuer handwerkzeugmaschinen, insbesondere schleifmaschinen |
DE4021510A1 (de) * | 1990-07-05 | 1992-01-09 | Bosch Gmbh Robert | Spannvorrichtung zum festspannen einer schutzhaube am spannhals einer handwerkzeugmaschine |
JP3632892B2 (ja) | 1998-10-30 | 2005-03-23 | 株式会社マキタ | 電動工具における工具カバーの装着構造 |
DE10000701A1 (de) * | 2000-01-10 | 2001-07-12 | Bosch Gmbh Robert | Winkelschleiferschutzhaube |
US6464573B1 (en) * | 2000-06-30 | 2002-10-15 | Porter-Cable Corporation | Guard attachment system with knurled clamp ring |
DE10316182A1 (de) * | 2003-04-09 | 2004-10-28 | Robert Bosch Gmbh | Handschleifmaschine mit Schutzhaube |
DE10343060A1 (de) * | 2003-09-16 | 2005-04-07 | Robert Bosch Gmbh | Handwerkzeugmaschine mit Schutzhaube |
DE102006022386A1 (de) * | 2006-05-12 | 2007-11-15 | Robert Bosch Gmbh | Schutzhaube für ein Handwerkzeug sowie Handwerkzeug mit Schutzhaube |
CN2923177Y (zh) * | 2006-06-26 | 2007-07-18 | 苏州宝时得电动工具有限公司 | 角磨护罩夹紧装置 |
DE102006053301A1 (de) * | 2006-11-13 | 2008-05-15 | Robert Bosch Gmbh | Handwerkzeugmaschine für ein rotierendes Werkzeug mit Schutzhaube |
KR20090021508A (ko) | 2007-08-27 | 2009-03-04 | 삼성전자주식회사 | 멀티-비트 및 싱글-비트 방식으로 데이터를 저장하는플래시 메모리 장치 및 그것의 프로그램 방법 |
JP5259614B2 (ja) * | 2007-10-22 | 2013-08-07 | 株式会社マキタ | グラインダにおける砥石カバーのストッパ装置 |
DE102007052684A1 (de) | 2007-11-05 | 2009-05-07 | Robert Bosch Gmbh | Handwerkzeugmaschine |
DE102007057032A1 (de) * | 2007-11-27 | 2009-05-28 | Robert Bosch Gmbh | Handwerkzeugmaschine |
-
2009
- 2009-08-10 DE DE200910028404 patent/DE102009028404A1/de not_active Withdrawn
-
2010
- 2010-06-10 JP JP2012524161A patent/JP5518192B2/ja active Active
- 2010-06-10 CN CN201080035408.2A patent/CN102470503B/zh active Active
- 2010-06-10 RU RU2012108435/02A patent/RU2550443C2/ru not_active IP Right Cessation
- 2010-06-10 EP EP10724080.6A patent/EP2464494B1/de active Active
- 2010-06-10 US US13/388,794 patent/US9085063B2/en active Active
- 2010-06-10 WO PCT/EP2010/058123 patent/WO2011018254A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011018254A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP5518192B2 (ja) | 2014-06-11 |
CN102470503B (zh) | 2015-12-16 |
DE102009028404A1 (de) | 2011-02-17 |
WO2011018254A1 (de) | 2011-02-17 |
RU2012108435A (ru) | 2013-09-20 |
JP2013501635A (ja) | 2013-01-17 |
US9085063B2 (en) | 2015-07-21 |
CN102470503A (zh) | 2012-05-23 |
EP2464494B1 (de) | 2016-03-30 |
US20120190280A1 (en) | 2012-07-26 |
RU2550443C2 (ru) | 2015-05-10 |
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