EP2209591B1 - Handwerkzeugmaschine - Google Patents

Handwerkzeugmaschine Download PDF

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Publication number
EP2209591B1
EP2209591B1 EP08804597.6A EP08804597A EP2209591B1 EP 2209591 B1 EP2209591 B1 EP 2209591B1 EP 08804597 A EP08804597 A EP 08804597A EP 2209591 B1 EP2209591 B1 EP 2209591B1
Authority
EP
European Patent Office
Prior art keywords
protective device
damping
housing
flange neck
protective
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
EP08804597.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2209591A1 (de
Inventor
Stefan Heess
Joerg Maute
Juergen Wiker
Florian Esenwein
Peter Stierle
Albrecht Hofmann
Thomas Schomisch
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 EP2209591A1 publication Critical patent/EP2209591A1/de
Application granted granted Critical
Publication of EP2209591B1 publication Critical patent/EP2209591B1/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
    • B24B27/00—Other grinding machines or devices
    • B24B27/06—Grinders for cutting-off
    • B24B27/08—Grinders for cutting-off being portable
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping
    • 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 is based on a hand tool according to the preamble of claim 1 or according to the preamble of claim 3.
  • a portable power tool with a housing forming a flange neck is known.
  • a protective device is accommodated, which forms a receiving area for a disk-shaped rotating tool.
  • the handheld power tool has a device for axial fixation and a device for radial fixation of the protection device on the flange neck.
  • a protection device designed as a protective hood which comprises a receiving collar for flanging to a hand tool, a conical region and a protective edge.
  • the conical region has several impressions for the reduction of resonances.
  • the receiving collar has a radially acting damping element, which is formed by an elastic insert. The damping element is arranged in a bore of the receiving collar.
  • the protective hood can be fastened by means of a pipe clamp to a flange neck of a hand-held power tool.
  • a handheld power tool comprising a housing, a flange neck and on the flange neck receivable protective device which forms a receiving area for a tool comprises.
  • the protective device is secured by means of a fixing device against rotation on the flange neck.
  • the fixing device comprises a latching lever with at least one latching cam, which engages in at least one latching opening of the protective device.
  • the hand tool comprises a device for damping and clearance compensation between housing and protective device.
  • the device has an axially acting means.
  • the invention relates to a hand tool, in particular an angle grinder, with a housing, with a flange neck and a auflangbaren on the flange neck protection device, which forms a receiving area for a tool, and with at least one device for damping and clearance compensation between the housing and the protective device wherein the device comprises at least one radially acting means and / or the device comprises at least one axially acting means.
  • the at least one means acting in the radial direction is a damping ring cooperating with a groove running around the outer circumference of the flange neck and / or at least one means cooperating with a groove in the at least one axially acting means Dampening ring acts, which is inserted in the circumferential groove, which is introduced into a bearing surface formed by the housing for the protective device. This reliably reduces or avoids a relative movement between the protective device and the housing of the handheld power tool. If the protective device is fixed as in the present case by positive engagement on the housing of the power tool and the receiving collar of the protective device has no adjustable clamping element, then a game for joining is necessary for placing the protective device on the housing of the power tool.
  • the acting in the radial direction means in particular by the between guard and housing possible and uncritical friction a damping effect between the protective device and the housing of the power tool.
  • this also creates a clearance balance between the protective device and the housing, which also leads to a reduction of the noise level.
  • the at least one acting in the radial direction means is a cooperating with a groove damping ring.
  • This has the advantage that the device is simple and inexpensive to produce. When the damping ring wear a simple replacement of the same by the user is possible.
  • the means acting in the axial direction between the protective device and the housing of the power tool achieves both a damping and a play-compensating effect.
  • the clearance compensation is created axially between the protective device and housing of the power tool.
  • an uncritical friction between the protective device and the housing is possible, which has a damping effect.
  • this also leads to a reduction of the noise level of the power tool.
  • the device is simple and inexpensive to produce.
  • the damping ring is easy to replace in case of repair by the user.
  • the device has at least one means acting between a housing-fixed means for fixing the protection device on the Flanschhals and the protective means, a simple and inexpensive damping between the housing and the protective device is effected, since the fixing device is fixedly connected to the housing.
  • the at least one means is at least one damping element mounted on the fixing device.
  • the damping element advantageously causes a simple way to reduce the game between housing and protective device.
  • the at least one means is at least one damping element mounted on the protective device.
  • the damping element By applying the damping element on the underside of the protective device, the damping element is protected from aggressive dusts and thus wear resistant.
  • the fixing device is a latching lever with at least one latching cam, which engages in at least one latching opening of the protective device, a particularly secure fixing of the protective device on the flange neck of the handheld power tool is achieved via positive engagement.
  • the device in this case requires only a small area of damping material in order to effect an efficient clearance compensation.
  • this device is therefore very inexpensive to produce, since only a small amount of damping material is needed.
  • the device for compensating for play is a spring device fastened to the protective device and a detent device.
  • the clearance between the protective device and the housing is compensated by the pressure force of the spring.
  • about the choice of spring force of the play compensation is adjustable.
  • the latching device comprises at least one spring-element-fixed latching element and at least one latching element receptacle fixed to the housing.
  • the matched to the spring device locking device causes a play-free, positive positioning of the protective device, the position of the protective device with little effort is adjustable.
  • the spring device acts on the latching element, starting from the protective device towards the flange neck.
  • the entire spring force is used for positioning the protective device in the axial direction. This means a positionally secure adjustment of the protection device for the user of the power tool.
  • the detent element receptacle is a wave profile and the detent element is an element with a corresponding wave profile.
  • the attached to the protective device spring device engages over the locking device on the flange neck of the housing.
  • the geometry of the latching device is chosen such that the user can overpress the latching device during rotation of the protective device and it is thus not necessary to manually disengage the spring-loaded latching device.
  • the lash adjuster is structurally produced with simple parts which are not functionally prone to failure.
  • the device for clearance compensation has a locking device with at least one spring-locking element and at least one protective device-fixed locking element receiving.
  • the entire force of the spring device acts continuously axially and radially on the locking device, so that the protection device can be accurately positioned by the user.
  • the detent element receptacle is a wave profile and the detent element is an element with a corresponding wave profile.
  • the protective device can be rotated stepwise according to a fixed angular distribution and the protective device is free of axial and radial play by the prestressed spring.
  • the geometry of the locking device is selected such that the user can overpress the locking device during rotation of the protective device and it is therefore not necessary to bring the spring-loaded locking device manually disengaged.
  • FIG. 1 shows a fragmentary illustrated, inventive hand tool.
  • the hand tool is an angle grinder 10.
  • the angle grinder 10 has a housing 12 which comprises a motor housing 78 and a gear housing 80 flanged to the motor housing 78. From the gear housing 80 protrudes an output shaft 82 which carries at its free end not shown here, a disc-shaped tool, such as a grinding wheel, which is rotatably driven about an axis 86 of the output shaft 82.
  • the output shaft 82 is rotatably mounted in a non-visible bearing, which is received in the present embodiments by a gearbox 80 formed by the transmission housing 80.
  • the gear flange 88 forms a freely projecting, cylindrical flange neck 14, which surrounds the output shaft 82 and receives on its outer periphery a protective device 16 in the form of a protective hood.
  • the gear flange 88 has a bearing surface 48 for the protective device 16 or for an annular end 52 of the protective device 16.
  • the protective device 16 forming a receiving region for the tool comprises a base body 90 and a receiving collar 92 which is connected to the base body 90 and which form a central opening 94 for the free passage of the output shaft 82.
  • the main body 90 is closed a protection of an operator of the power tool 10 before sparks and / or material particles that arise during operation of the power tool 10 is provided.
  • the base body 90 is formed by a plate-shaped element 96, which has a semicircular design, wherein the plate-shaped element 96 covers an angular range of approximately 180 ° of the tool. This will send sparks and / or any particles of material forward, away from the operator.
  • a protective edge 98 Arranged on the dish-shaped element 96 is a protective edge 98, which is initially aligned perpendicular to the plate-shaped element 96 and subsequently parallel to the plate-shaped element 96.
  • the receiving collar 92 connected to the main body 90 is initially designed as a cylindrical body which runs parallel to the flange neck 14. To the cylindrical body of the receiving collar 92 then includes an edge-like laterally outwardly angled portion 100 of the receiving collar 92, which is parallel to the plate-shaped element 96 of the base body 90 and concentric with the opening 94 for the output shaft 82.
  • the handheld power tool 10 has a device 18 for the axial fixing of the protective device 16 and a device 20 for the radial fixing of the protective device 16.
  • the device 18 for axial fixation is preferably designed as a so-called key-keyhole or bayonet lock system.
  • the flange neck 14 contributes to axially approximately centrally an annular groove 102, wherein its outer Ringnutbegrenzung 104 is interspersed at regular intervals by axial grooves 106, which corresponding radial cam 108 in the receiving collar 92 of the protective device 16 are assigned, wherein the radial cam 108 in the receiving collar 92 of the protective device 16th are embossed and protrude radially inward.
  • the axial grooves 106 and the radial cams 108 are mating to each other fittingly in a plug-in rotary motion, such as a key-keyhole or bayonet lock system.
  • the radial cam 108 in the receiving collar 92 of the protective device 16 are dimensionally consistent with the axial grooves 106 in the flange neck 14 so that they pass through axial plugging, then enter into the annular groove 102 of the flange neck 14 by radial rotation and there hold the protective device 16 axially secured , wherein the protective device 16 rests with the end face 52 on the support surface 48 of the transmission flange 88.
  • the device 20 for radial fixation preferably takes place via a latching.
  • the radial fixing device 20 has a latching lever 62 with at least one latching cam 64, which engages in at least one latching opening 66 of the protective device 16.
  • the latching openings 66 are arranged in the hutrand-angled region 100 of the receiving collar 92.
  • the locking cams 64 are arranged on the latching lever 62 formed or fastened to the housing 12.
  • the locking lever 62 on its housing-remote side above an area for the locking cam 64, which are intended to engage in the locking openings 66 of the receiving collar 92.
  • the protective device 16 By entering the locking cam 64 of the locking lever 62 in the locking openings 66 of the receiving collar 92, the protective device 16 is secured against rotation on the flange neck 14. Approximately in the middle of the locking lever 62 carries a compression spring 110, via which the locking lever 62 biased on the housing 12 so supported that it can always be supported with a minimum force with its locking cam 64 on the hutrand-angled region 100 of the receiving collar 92 and the entrance of the locking cams 64 is always secured in the latching openings 66.
  • the handheld power tool 10 has at least one device 22, 24 for damping and / or clearance compensation between the housing 12 and the protective device 16.
  • the device 22, 24 according to the invention may have damping properties, clearance compensation properties or predominantly both properties at the same time.
  • a distinction is now made as to which device 22, 24 which characteristic is present or predominates, ie a distinction is made between devices 22 in which the damping characteristic is present or predominates, and devices 24 in which the clearance compensation characteristic is present or predominates.
  • damping devices which act in the radial direction 26 damping devices which act in the axial direction 40, and damping devices, which between the device 18, 20 for fixing the protective device 16 and the protective device 16 act, of course, combinations of the types of damping devices 22 are conceivable.
  • the Figures 1 and 2 show a damping device 22a in a first embodiment, wherein the damping device 22a has a means acting in the radial direction 26a means 28a.
  • This is a damping ring 32a cooperating with a groove 30a.
  • the damper ring 32a is inserted into a groove 30a encircling an outer periphery of the flange neck 14a, the damper ring 32a projecting radially beyond the groove 30a.
  • the damping ring 32a is made of a material having damping properties, such as an elastic plastic.
  • FIG. 3 shows in a detail view an alternative to this.
  • the means acting in the radial direction 26a means 28a instead of the damping ring 32a to a on the outer circumference of the flange neck 14a preferably fixedly mounted, at least partially circumferential damping material 34a.
  • the damping material 34a is molded firmly against the flange neck 14a.
  • the radially acting means 28a is provided on the protection device 16a. This is an at least partially encircling damping material 38a, which is preferably firmly attached to an inner wall 36a of the protective device 16a.
  • a damping ring may be provided instead of the damping material 38a, which is inserted into a circumferential groove in the inner wall of the protective device, wherein the damping ring projects radially beyond the groove.
  • FIG. 5 shows a damping device 22b in a second embodiment, wherein the damping device 22b has an acting in the axial direction 40b means 42b.
  • This is a damping ring 44b cooperating with a groove 46b.
  • the damping ring 44b is inserted into the circumferential groove 46b, which is inserted in a support surface 48b formed by the housing 12b for the protection device 16b.
  • it may be in the axial direction 40b acting means 42b instead of the damping ring 44b according to FIG. 5 also according to several, arranged on the support surface 48b for the protection device 16b damping elements 50b according to FIG. 6 act.
  • the damping elements 50b may also be damping material applied to the support surface for the protective device.
  • the axially acting means 42b is a damping material 54b which is preferably fixedly attached, at least partially encircling an end face 52b of the protection device 16b facing one of the support surface 48b of the transmission flange 88b. Furthermore, it may be in place of the damping material 54b and a act on the bearing surface of the gear flange facing end face of the protective circumferential damping ring.
  • FIGS. 8 to 10 show a damping device 22c in a third embodiment, wherein the damping device 22c at least one acting between the housing-fixed means 18c, 20c for fixing the protection device 16c on the flange neck 14c and the protective device 16c means 56c acting.
  • the means 56c may be a damping element 58c, 60c mounted on the fixing device 18c, 20c or on the protective device 16c.
  • the fixing device is preferably the device 20c for radially fixing the protective device 16c, wherein Fig. 8 the hand tool 10c with the housing 12c mounted locking lever 62c and Fig. 10 the associated protection device 16c shows. According to Fig. 9 is on the locking cam 64c of the locking lever 62c and / or according to Fig. 10 in the latching opening 66c of the receiving collar 92c, a damping element 58c, 60c arranged.
  • FIG. 11 shows a clearance compensation device 24d in a first embodiment, which is designed as a spring device 68d attached to the protective device 16d and a latching device 70d.
  • the latching device 70d comprises at least one detent element 72d arranged on the spring device 68d or spring device-fixed detent element 72d and at least one latching element receptacle 74d cooperating with the detent element 72d and arranged on the flange neck 14d or fixed to the housing.
  • the spring device 68d acts on the latching element 72d, starting from the protective device 16d toward the flange neck 14d.
  • the latching element receptacle is an at least partially encircling shaft profile 74d on an end face 76d of the flange neck 14d facing the protective device 16d, and in the latching element an element 72d with a corresponding wave profile.
  • the wave profile 74d and / or the wave profile 72d may additionally be provided with a damping, not shown here, for example in the form of a rubber coating.
  • FIG. 12 shows a lash adjuster 24e in a second embodiment, which is formed as a fixed to the housing 12e and thus fixed to the housing spring means 68e, which acts on the protection device 16e.
  • the spring device 68e acts on the protective device 16e to the flange neck 14e out.
  • the device 24e for compensating for play may additionally comprise a detent device 70e which comprises at least one detent element 72e arranged on the spring device 68e and at least one detent element retainer 74e which cooperates with the detent element 72e and is arranged on the protective device 16e.
  • the latching element receptacle is preferably an at least partially encircling shaft profile 74e on an end face 76e of the protective device 16e facing the flange neck 14e and on the latching element about an element 72e with a corresponding wave profile.
  • the wave profile 74e and / or the wave profile 72e may additionally be provided with a damping, not shown here, for example in the form of a rubber coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Soil Working Implements (AREA)
EP08804597.6A 2007-11-05 2008-09-23 Handwerkzeugmaschine Active EP2209591B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710052683 DE102007052683A1 (de) 2007-11-05 2007-11-05 Handwerkzeugmaschine
PCT/EP2008/062680 WO2009059846A1 (de) 2007-11-05 2008-09-23 Handwerkzeugmaschine

Publications (2)

Publication Number Publication Date
EP2209591A1 EP2209591A1 (de) 2010-07-28
EP2209591B1 true EP2209591B1 (de) 2013-07-03

Family

ID=40317099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804597.6A Active EP2209591B1 (de) 2007-11-05 2008-09-23 Handwerkzeugmaschine

Country Status (5)

Country Link
EP (1) EP2209591B1 (ru)
CN (1) CN101848792B (ru)
DE (1) DE102007052683A1 (ru)
RU (1) RU2490108C2 (ru)
WO (1) WO2009059846A1 (ru)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5684056B2 (ja) * 2010-08-16 2015-03-11 株式会社マキタ 手持ち工具
DE102011083430A1 (de) * 2011-09-26 2013-03-28 Robert Bosch Gmbh Werkzeugmaschinenbremsvorrichtung
DE102011089726A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Werkzeugmaschine
DE102012112621A1 (de) * 2012-12-19 2014-06-26 C. & E. Fein Gmbh Handwerkzeugmaschine mit abnehmbarer Schutzhaube
DE102017213743A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Schutzvorrichtung für eine Handwerkzeugmaschine
DE202019104156U1 (de) * 2019-07-29 2020-11-02 C. & E. Fein Gmbh Getriebekopf und Handwerkzeugmaschine
DE202019105846U1 (de) * 2019-10-21 2021-01-22 C. & E. Fein Gmbh Elektrohandwerkzeugmaschine
DE202020101891U1 (de) * 2020-04-06 2021-07-12 C. & E. Fein Gmbh Elektrowerkzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058793A1 (de) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Handwerkzeugmaschine mit schutzhaube, insbesondere winkelschleifer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756362A1 (de) 1977-12-17 1979-06-21 Bosch Gmbh Robert Schutzhaube, insbesondere fuer ein elektro-handwerkzeug
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
DE4239367A1 (de) * 1992-11-24 1994-05-26 Bosch Gmbh Robert Handgeführtes Elektrowerkzeug, insbesondere Winkelschleifmaschine
DE4344571A1 (de) * 1993-12-24 1995-06-29 Bosch Gmbh Robert Elektrische Handwerkzeugmaschine
DE19841409C1 (de) * 1998-09-10 2000-02-10 Metabowerke Kg Elektrohandwerkzeug mit einer Schutzhaube
DE10124439A1 (de) * 2001-05-18 2002-11-21 Bosch Gmbh Robert Handgeführtes Elektrowerkzeug mit Schutzhaube
SE525836C2 (sv) * 2003-03-31 2005-05-10 Atlas Copco Tools Ab Slipmaskin med sprängskydd och spindellåsning
DE10343060A1 (de) 2003-09-16 2005-04-07 Robert Bosch Gmbh Handwerkzeugmaschine mit Schutzhaube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058793A1 (de) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Handwerkzeugmaschine mit schutzhaube, insbesondere winkelschleifer

Also Published As

Publication number Publication date
EP2209591A1 (de) 2010-07-28
RU2010122641A (ru) 2011-12-20
CN101848792B (zh) 2013-07-03
DE102007052683A1 (de) 2009-05-07
CN101848792A (zh) 2010-09-29
RU2490108C2 (ru) 2013-08-20
WO2009059846A1 (de) 2009-05-14

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