EP0615483A1 - Meuleuse a disque a excentrique - Google Patents

Meuleuse a disque a excentrique

Info

Publication number
EP0615483A1
EP0615483A1 EP93920676A EP93920676A EP0615483A1 EP 0615483 A1 EP0615483 A1 EP 0615483A1 EP 93920676 A EP93920676 A EP 93920676A EP 93920676 A EP93920676 A EP 93920676A EP 0615483 A1 EP0615483 A1 EP 0615483A1
Authority
EP
European Patent Office
Prior art keywords
eccentric
shaft
disc grinder
grinder according
hollow
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
Application number
EP93920676A
Other languages
German (de)
English (en)
Other versions
EP0615483B1 (fr
Inventor
Walter Barth
Michael Knuth
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 EP0615483A1 publication Critical patent/EP0615483A1/fr
Application granted granted Critical
Publication of EP0615483B1 publication Critical patent/EP0615483B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement

Definitions

  • the invention is based on an eccentric disc grinder according to claim 1.
  • a generic eccentric disc grinder is known from EP 406 247 (US Serial No. 566 378). Its grinding plate is driven by a motor. The rotation of the motor is converted into the working movement via an angular gear, which is composed of a rotary movement and a circular movement of the grinding plate. At its free end, the output shaft of the angular gear is non-rotatably coupled to an eccentric. This bears a pivot on which the grinding plate is held in a rotationally fixed manner with an eccentricity "e” to the output shaft. The grinding disc circles with the eccentricity "e” around the axis of the output shaft and rotates at the same time as a result of the bearing friction and carries out the working movement.
  • the eccentric disc grinder according to the invention with the characterizing features of claim 1, in contrast, has the advantage of compact design, low bearing wear, reduced vibrations and lower manufacturing costs and better manageability.
  • a long eccentric shaft is rotatably mounted in the eccentric instead of a short pin supporting the grinding plate and the eccentric is designed as an open hollow shaft at both ends, the bearing distance for the eccentric shaft can be very large with compact dimensions of the angular drive housing.
  • the bearing forces are easier to calculate and control.
  • the eccentric shaft runs more smoothly and bearing wear is reduced despite the smaller bearing sizes.
  • FIG. 1 shows an eccentric disc grinder according to the invention
  • FIG. 2 shows an enlarged detail according to FIG. 1 with the view of FIG Arrangement of the eccentric shaft carrier with a slightly varying function
  • FIG. 3 shows a further exemplary embodiment of an eccentric disc grinder according to the invention.
  • the eccentric disc grinder 1 shown in FIG. 1 has a motor housing 3 on which an electrical connection cable 5 and an on and off switch 7 are arranged.
  • a housing 9 configured as an angular drive housing is flanged to the motor housing 3, which carries an upper housing cover 11 and contains an angular drive 14 which is operatively connected to a grinding plate 13.
  • the angular drive 14 consists of a small bevel gear 15 which sits on a motor shaft 16 and transmits the motor speed to a large bevel gear 17.
  • the bevel gear 17 concentrically, non-rotatably engages an eccentric designed as a hollow shaft 19 that can be rotated about an axis of rotation 18.
  • the hollow shaft 19 is mounted in the housing 9 in a region near the grinding plate and in a region remote from the grinding plate in bearings 21, 23 and at the same time forms the output shaft of the angular drive 14.
  • the hollow shaft 19 has a bore 25 eccentric to the axis of rotation 18 with an axis 26.
  • the axis 26 runs to The axis of rotation 18 is spaced parallel to the eccentricity "e".
  • an eccentric shaft 27 is guided concentrically to the axis 26 in an upper ball bearing 29 and a lower needle bearing 31.
  • the eccentric shaft 27 At the lower end of the eccentric shaft 27 there is a non-rotatable fan 33 for dust extraction, which also acts as a balancing mass.
  • the free end of the eccentric shaft 27 carries an elastic coupling 35, for example an injected plastic part.
  • This is followed by a rotationally fixed nut 37 with a threaded bore 39, to which the grinding plate 13 is screwed by means of a bolt 41.
  • the elastic coupling 35 transmits the force from the eccentric shaft 27 to the grinding plate 13 in a rotationally fixed and flexible manner.
  • the grinding plate 13 is provided with recesses which are regularly distributed over its surface 43 provided, through which grinding dust can be extracted from the workpiece.
  • a spur gear 45 which meshes with a hollow gear 47 fixed to the housing.
  • the spur gear 45 rotates together with the eccentric shaft 27.
  • the spur gear 45 rotates about the axis 26 and takes the eccentric shaft 27 and the grinding plate 13 with it.
  • the grinding plate 13 follows the movement of the eccentric shaft 27. It is supported on the eccentric shaft 27 via the elastic coupling 35. During grinding work, the grinding plate 13 can adapt to the workpiece surfaces or follow the pivoting of the eccentric shaft axis relative to the normal to the workpiece without tilting when handling the eccentric disc grinder. Workpieces can be processed particularly gently without jerky movements.
  • the arrangement of the roller or needle bearing 31 in the vicinity of the grinding plate 13 and the arrangement of the ball bearing 29 far from the grinding plate 13 between the eccentric shaft 27 and the hollow shaft 19 improve the efficiency of the transmission of movement and increase the service life of the eccentric plate grinder 1 Compared to the prior art, because the radial and axial bearing forces are absorbed separately so that they are more manageable.
  • the enlargement of the front area of the slightly modified eccentric disc grinder 101 shown in FIG. 2 illustrates the arrangement of the housing 109 designed as an angular gear housing with the upper housing cover 111, the angular drive 114 operatively connected to the grinding plate (not shown) with the small one Bevel gear 115, the motor shaft 116 and the large bevel gear 117, the hollow shaft 119 encompassed by the bevel gear 117 in a rotationally fixed manner and the bearings 121, 123.
  • the bore 125 which is eccentric to the axis of rotation 118 and has an axis 126, in which the eccentric shaft 127 is guided concentrically to the axis 126 in the upper ball bearing 129 and the lower needle bearing 131 can be seen particularly well.
  • the lower end region of the eccentric shaft 127 is shown with a balancing mass 133 arranged in a rotationally fixed manner without a fan and without a grinder.
  • the spur gear 145 which meshes with the hollow gear 147, is shown at the upper end region.
  • the hollow shaft 119 is longer in Figure 2, so that it can carry the balancing mass 133 at the lower, free end.
  • the hollow gear 147 can be locked by a locking rod 151, rotatably arranged in a slide bearing 149 on the angular drive housing 109.
  • the movement sequence of the eccentric shaft 127 corresponds to the description of FIG. 1. If the locking rod 151 is out of engagement with the locking recess 153 in the hollow gear 147, it can rotate and avoid the rolling of the spur gear 145 so that it does not rotate about its own axis 126, but only about the axis 118 can circle. This movement is passed on to the grinding plate via the eccentric shaft 127 and means a comparatively lower removal rate than with the same rotating and rotating grinding disc.
  • FIG. 3 shows a further exemplary embodiment of an eccentric disc grinder 161, which is basically the same as that of FIGS. 1 and 2.
  • This has a motor housing 162 on which an electrical connection cable 163 and an on and off switch 164 are arranged.
  • a housing 165 configured as an angular gear housing is flanged to the motor housing 162 and contains an angular drive 168 which is operatively connected to a grinding plate 167.
  • the angular drive 168 consists of a small bevel gear 169 which sits on a motor shaft 170 and transmits the motor speed to a large bevel gear 171.
  • the bevel gear 171 encompasses concentrically, non-rotatably around an eccentric designed as a hollow shaft 173 and rotatable about an axis of rotation 172.
  • the hollow shaft 173 is mounted in the housing 165 in a roller or needle bearing 175 near the grinding plate and in a ball bearing 174 remote from the grinding plate.
  • the hollow shaft 173 has a bore 176 eccentric to the axis of rotation 172 with an axis 177.
  • the axis 177 runs parallel to the axis of rotation 172 and is spaced apart with the eccentricity "e”.
  • an eccentric shaft 178 is guided concentrically to the axis 177 in an upper ball bearing 179 and a lower needle bearing 180.
  • a balancing mass 181 in a rotationally fixed manner.
  • the free end of the eccentric shaft 178 carries the grinding plate 167, which has recesses 182 which are regularly distributed over its surface and through which grinding dust can be extracted.
  • a spur gear 183 At the upper end area of the eccentric shaft 178 there is a spur gear 183, which meshes with a hollow gear 184 fixed to the housing.
  • the hollow gear 184 is axially displaceably mounted in the housing 165 and can be brought into or out of engagement with the spur gear 183 by means of a switching button 186 by means not shown in detail.
  • the motor shaft 170 rotates and takes the bevel gears 169, 171 with it.
  • the bevel gear 171 rotates together with the hollow shaft 173 about the axis of rotation 172.
  • the hollow shaft 173 takes the eccentric shaft 178 with it in its eccentric bore 176.
  • the eccentric shaft 178 circles about the axis of rotation 172 with the eccentricity "e", the grinding plate 167 following this movement.
  • the eccentric shaft 178 is only taken along by the friction in the bearings 179, 180, which the grinding plate 167 follows.
  • the grinding plate 167 When the grinding plate 167 is pressed onto a workpiece surface, it rotates at only a low speed, or so to speak, is stationary. The grinding effect is the least with this type of movement, so that the operating position "fine grinding" is set.
  • roller or needle bearings 175, 180, ie the radial force-absorbing bearing, in the vicinity of the grinding plate 167 and the arrangement of the ball bearings 174, 179, ie the axial force-absorbing bearing, far from the grinding plate 167 between the eccentric shaft 178 and hollow shaft 173 and between eccentric 173 and housing 165 also improve the efficiency of the movement transmission and increase the life duration of the eccentric disc grinder 101 compared to the known eccentric disc grinders clearly.
  • a lockable, elastic coupling is arranged between the grinding plate and the eccentric shaft, so that, if necessary, work can be carried out with conventional eccentric disc grinders.
  • the adjustment means (not shown) for changing the machining stage or the gear position are bolts which are connected to the hollow gear fixed to the housing and are guided in oblique guides or oblique slots in the housing. When the bolts in the slots are adjusted, the ring gear is moved axially.
  • the bolt carries at least one clamping or latching device, by means of which the adjusting means can be fixed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

L'invention concerne une meuleuse à disque à excentrique (1, 101, 161) avec un boîtier (3, 103, 9, 109, 162, 165) constitué en particulier de plusieurs parties, dans lequel un moteur avec un arbre (16, 116, 170) met en mouvement un disque de meulage (13, 113, 167) par l'intermédiaire d'un excentrique (19, 119, 173), excentrique (19, 119, 173) qui entraîne, dans un mouvement circulaire et et de rotation simultanée autour de l'axe (26, 126, 177), le disque de meulage (13, 113, 167) avec une excentricité "e" autour de l'axe de rotation (18, 118, 172). L'objectif de l'invention est de créer un appareil compact, robuste et d'un maniement commode. Cet objectif est atteint par le fait que l'excentrique se présente comme un arbre creux (19, 119, 173) ouvert à ses deux extrémités avec un orifice excentrique (25, 125, 176) d'où un arbre d'excentrique (27, 127, 178) portant le disque de meulage (13, 113, 167) dépasse à une extrémité au moins.
EP93920676A 1992-10-07 1993-10-04 Meuleuse a disque a excentrique Expired - Lifetime EP0615483B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4233728A DE4233728A1 (de) 1992-10-07 1992-10-07 Exzentertellerschleifer
DE4233728 1992-10-07
PCT/DE1993/000933 WO1994007654A1 (fr) 1992-10-07 1993-10-04 Meuleuse a disque a excentrique

Publications (2)

Publication Number Publication Date
EP0615483A1 true EP0615483A1 (fr) 1994-09-21
EP0615483B1 EP0615483B1 (fr) 1999-06-09

Family

ID=6469861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93920676A Expired - Lifetime EP0615483B1 (fr) 1992-10-07 1993-10-04 Meuleuse a disque a excentrique

Country Status (7)

Country Link
US (1) US5458533A (fr)
EP (1) EP0615483B1 (fr)
JP (1) JP3288379B2 (fr)
CN (1) CN1088000C (fr)
BR (1) BR9305662A (fr)
DE (2) DE4233728A1 (fr)
WO (1) WO1994007654A1 (fr)

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GB9423848D0 (en) * 1994-11-25 1995-01-11 Black & Decker Inc Improved oscillating hand tool
US6012213A (en) * 1995-06-07 2000-01-11 Chang; Joseph J. Method for forming a rib on a cannula for a tip protection device
US5595531A (en) * 1995-07-26 1997-01-21 Ryobi North America Random orbit sander having speed limiter
US5582541A (en) * 1995-08-24 1996-12-10 Hutchins Manufacturing Company Abrading tool with water feed and removal system
US5851141A (en) * 1996-12-09 1998-12-22 Elmore; Ronald W. Elongated orbital power sander
DE19848918A1 (de) 1998-07-28 2000-02-10 Bernhard Ganser Schleifvorrichtung für gebogene Flächen
US6386961B1 (en) * 1999-07-19 2002-05-14 Thomas D. Cureton Hand held grinder
DE19952108B4 (de) * 1999-10-29 2007-09-20 Robert Bosch Gmbh Exzentertellerschleifmaschine
JP4558154B2 (ja) * 2000-07-28 2010-10-06 ケヰテック株式会社 偏心量調整装置
DE10047202A1 (de) 2000-09-23 2002-04-11 Bosch Gmbh Robert Motorgetriebene Handschleifmaschine
DE10104993A1 (de) * 2001-02-03 2002-08-22 Bosch Gmbh Robert Handwerkzeugmaschine zum Schleifen, Polieren oder dergleichen
US6758731B2 (en) * 2001-08-10 2004-07-06 One World Technologies Limited Orbital sander
DE102006054265B3 (de) * 2006-11-17 2008-04-10 Festool Gmbh Handwerkzeugmaschine
DE102007007787A1 (de) * 2007-02-16 2008-08-21 Robert Bosch Gmbh Schleifteller für eine Exzenterschleifmaschine
US20090111364A1 (en) * 2007-10-29 2009-04-30 Jinding Group Co., Ltd. Power tool having an eccentric mass
AT10804U1 (de) * 2009-06-04 2009-10-15 Neustifter Johann Verfahren zum umbau eines verteilergetriebes für mehrere abtriebe
DE102010043185A1 (de) * 2010-10-29 2012-05-03 Robert Bosch Gmbh Werkzeugmaschinenbremsvorrichtung
DE102011075222A1 (de) * 2011-05-04 2012-11-08 Robert Bosch Gmbh Werkzeugmaschinenbremsvorrichtung
US20120322350A1 (en) * 2011-06-19 2012-12-20 Mr. ROBERT SCHYWALSKY Cordless drywall sander
CN103379982B (zh) * 2011-10-26 2016-12-21 凯德科株式会社 具有偏心转轴的研磨装置
US9649738B2 (en) 2012-11-29 2017-05-16 Oy Kwh Mirka Ab Arrangement and method for grinding spherical products
CN103862338B (zh) * 2012-12-12 2016-08-17 苏州宝时得电动工具有限公司 具有推杆式止动机构的角磨机
ITVI20130116A1 (it) * 2013-04-23 2014-10-24 Costa Levigatrici Spa Macchina levigatrice multiutensile
CN103286689B (zh) * 2013-05-30 2015-05-27 杨文武 一种偏心抛光机
WO2015164920A1 (fr) * 2014-05-01 2015-11-05 Arbortech Industries Limited Ponceuse orbitale aléatoire
JP6464017B2 (ja) * 2014-05-09 2019-02-06 株式会社マキタ 研磨機
DE102014109904A1 (de) * 2014-07-15 2016-01-21 C. & E. Fein Gmbh Exzenterschleifer
DE102014116598A1 (de) * 2014-11-13 2016-05-19 Vorwerk & Co. Interholding Gesellschaft mit beschränkter Haftung Vorrichtung, Verwendung einer Vorrichtung und Verfahren zur Oberflächenbearbeitung
US20180009084A1 (en) * 2016-07-07 2018-01-11 Stone Pro Equipment Company Abrading Disc
DE102016223508A1 (de) * 2016-11-28 2018-05-30 Robert Bosch Gmbh Tragbare Werkzeugmaschine
CN209408223U (zh) * 2018-01-15 2019-09-20 苏州宝时得电动工具有限公司 打磨工具
DE102018115303A1 (de) * 2018-06-26 2020-01-02 C. & E. Fein Gmbh Getriebekopf und Handwerkzeugmaschine
EP3656503B1 (fr) * 2018-10-29 2023-10-18 Guido Valentini Outil électrique de ponçage ou de polissage orbital aléatoire guidé à la main portatif
EP3693132B1 (fr) * 2019-02-08 2023-09-06 Guido Valentini Outil électrique de ponçage ou de polissage orbital aléatoire guidé à la main portatif
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Also Published As

Publication number Publication date
DE4233728A1 (de) 1994-04-14
WO1994007654A1 (fr) 1994-04-14
JP3288379B2 (ja) 2002-06-04
DE59309642D1 (de) 1999-07-15
BR9305662A (pt) 1996-11-26
US5458533A (en) 1995-10-17
JPH07501756A (ja) 1995-02-23
CN1088000C (zh) 2002-07-24
CN1086758A (zh) 1994-05-18
EP0615483B1 (fr) 1999-06-09

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