EP0406247B1 - Meuleuse excentrique - Google Patents

Meuleuse excentrique Download PDF

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Publication number
EP0406247B1
EP0406247B1 EP89901938A EP89901938A EP0406247B1 EP 0406247 B1 EP0406247 B1 EP 0406247B1 EP 89901938 A EP89901938 A EP 89901938A EP 89901938 A EP89901938 A EP 89901938A EP 0406247 B1 EP0406247 B1 EP 0406247B1
Authority
EP
European Patent Office
Prior art keywords
eccentric
backing pad
intermediate disc
toothed
disc
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.)
Expired - Lifetime
Application number
EP89901938A
Other languages
German (de)
English (en)
Other versions
EP0406247A1 (fr
Inventor
Günter Schaal
Fred Weinmann
Günther Berger
Dieter Dörr
Karl-Heinz Braunbach
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 EP0406247A1 publication Critical patent/EP0406247A1/fr
Application granted granted Critical
Publication of EP0406247B1 publication Critical patent/EP0406247B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • 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
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention is based on an eccentric grinder according to the preamble of the main claim.
  • An eccentric grinder known from EP-A 254 850 has a central hub body which supports the grinding plate and has a friction surface which counteracts a turning up of the grinding plate as a result of bearing friction when idling. Furthermore, the hub body can be coupled with axially displaceable toothing, which is connected to the housing in a rotationally fixed manner. The entire gearbox structure is complicated and, with a large overall length, requires considerable effort for balancing.
  • the eccentric grinder according to the invention with the characterizing features of claim 1 has the advantage that it allows two or more differently rough grinding movements with a simple gear structure. In addition, the flatter design of the eccentric grinding head makes handling much easier.
  • the washers according to claim 5 reach up to the eccentric shaft and have a heat-conducting connection therewith.
  • the heat generated in the bearings of the eccentric shaft can be dissipated into the washer and released by the latter to the ventilation flow passing through the ventilation openings.
  • the ventilation openings also make it easier to remove the washer by hand.
  • the arrangement of the ventilation openings on the sanding plate according to claim 10 enables the use of both the commercially available six-hole sanding papers and those with eight holes.
  • FIG. 1 shows a cross section through the eccentric grinder
  • FIG. 2 shows a perspective view of the fan wheel and one of the Intermediate discs
  • Figure 3 shows the arrangement of the ventilation openings on the grinding plate.
  • An eccentric grinder 1 has a motor housing 2 and a grip shell 3, which is arranged above a gear housing 4 for an angular gear with an output shaft 5.
  • a fan housing 6 is attached, which has an exhaust port 7.
  • a fan wheel 8 which is firmly connected to the output shaft 5.
  • An eccentric shaft 9 with the eccentricity X to the axis of the drive shaft 4 is inserted in the fan wheel 8 from below and is supported by means of the bearings 10 and 11.
  • the eccentric shaft 9 has a collar 12 and a square end section 13 with an internal thread for a fastening screw 14.
  • the intermediate disk 17 with a square central opening 18 is slipped onto the end section 12.
  • the intermediate disc 17 is preferably made of aluminum, which is provided with a hard, wear-resistant surface by anodizing.
  • the intermediate disc 17 has a raised ring 19 on both sides, which lies against the collar 12 of the eccentric shaft 9 for centering. Radially outside the ring 19, the washer 17 has ventilation openings 20.
  • the intermediate disk 17 carries on each side a friction or toothed ring 21, 22 of preferably different diameters.
  • the ring gears 21, 22 can be made of aluminum, the base material of the intermediate disk 17, or of plastic. With its raised central region 23, a grinding plate 24 bears against the intermediate disk 17. It is also attached to the end section 13 with a central square opening 25.
  • the grinding plate 24 carries a projecting collar 26 pointing toward the intermediate disc 17.
  • An elastic pad 27 is placed on the grinding plate 24.
  • the grinding plate 24 and the pad 27 have ventilation openings 28, 29.
  • the ventilation openings 20 and 28 and 29 are arranged so that they lie congruently one above the other when the intermediate disc 17 and the grinding plate 24 are attached to the square trim 13.
  • An abrasive paper 30 is fastened to the support 27, for example by means of a Velcro fastener.
  • a toothed disc 31 is fastened to the fixed fan housing 6 by means of three screws 32. To prevent rotation and for centering, the toothed disk 31 has pins 33 which engage in corresponding recesses in the fan housing 5. Instead of using screws 32, the toothed disk can also be fastened to the fan housing 6 by means of snap locks.
  • the toothed disk 31 On the side facing the intermediate disk 17, the toothed disk 31 carries two friction or toothed rings 34, 35 of different diameters, which can be brought into engagement with the toothed rings 21, 22 on the intermediate disk 17.
  • the sprockets 34, 35 are either made of plastic or in a wear-resistant metal, so that each with the sprockets 21, 22 results in a pair of metal and plastic, in which wear can only occur on the easily replaceable plastic teeth.
  • FIG. 2 shows a second intermediate disk 37 which has rings 38, 39 on the circumference which correspond to the toothed rings 34, 35 on the intermediate disk 17, but are toothless.
  • the intermediate disk 37 like the intermediate disk 17, has a raised ring 40 on both sides and a central square opening 41.
  • the ventilation openings 42 correspond to the openings 20.
  • the intermediate disk 37 On one of its two sides, the intermediate disk 37 carries webs 43 which extend radially outward from the ring 40 and which can be inserted in a form-fitting manner in recesses 44 on the fan wheel 8. This creates a rotationally fixed connection between the fan wheel 8 and the intermediate disk 37.
  • the webs 43 are missing on the rear side, not shown, so that the intermediate disk 37, when it faces the fan wheel 8 with the rear side, can rotate freely without contact with it, as is also the case with the intermediate disk 17 (see FIG. 1).
  • the arrangement of the ventilation openings 28 in the grinding plate 24 is shown in FIG. Six of the openings are arranged in a circular symmetry on a diameter 46 of approximately 80 mm and approximately eight openings 47 on a diameter of approximately 65 mm.
  • the fan wheel 8 fulfills several functions. In addition to generating the eccentric movement and compensating for unbalance, it generates a suction air flow that also serves to cool the bearings and the gears. Grinding dust-laden air is sucked in through the ventilation openings 29 and 28 in the grinding plate and 20 in the intermediate disc and released again via the exhaust air connector 7. At the same time, the intermediate disk 17 or 37 is cooled by the ventilation flow, to which the heat generated in the bearings 10 and 11 is released via the eccentric shaft 12.
  • the invention is not limited to the exemplary embodiment shown. Instead of the two reversible intermediate discs 17 and 37, four individual discs can also be used, each of which can be firmly connected to its own grinding plate in the central area. This would also result in a flatter design for the grinder.
  • the four grinding movements can also be generated by means of a single washer, which carries the two differently sized sprockets on the same side and whose webs that can be inserted into the fan wheel are detachable, foldable or switchable from the outside during the fine, medium-sized and rough grinding movement.
  • they would be non-rotatably connected to the housing Sprockets axially displaceable so that either one, the other or neither of the two come into engagement with the sprockets of the washer.

Abstract

L'engrenage excentrique d'une meuleuse excentrique est configuré de sorte que le fonctionnement du disque de meulage n'affecte pas négativement l'engrenage et que le refroidissement soit amélioré. L'engrenage excentrique est découplé du disque de meulage (24), étant donné que celui-ci n'est relié à la rondelle intermédiaire (17) qui porte les couronnes dentées (21, 22) que par sa partie centrale. La rondelle intermédiaire (17) sert en même temps à évacuer la chaleur générée dans les paliers (10 et 11) vers le courant d'aspiration qui s'écoule à travers les passages d'aération (28, 29). Cette meuleuse excentrique capable d'exécuter quatre mouvements différents de meulage fin se prête à tous travaux de meulage.

Claims (10)

  1. Ponceuse excentrique munie d'un arbre excentrique et d'un dispositif pour modifier le mouvement de son plateau de ponçage comportant au moins une couronne fixe à denture ou à friction, le plateau de ponçage (24) étant solidaire en rotation par sa partie centrale avec l'arbre excentrique, la périphérie du plateau (24) étant espacée axialement et dépourvue de liaison par rapport aux autres parties de la ponceuse, ponceuse caractérisée en ce qu'un disque intercalaire réversible (17) est disposé entre le carter (6) de la ponceuse et le plateau de ponçage (24), ce disque (17) portant au moins une couronne (21, 22) de friction ou à denture, laquelle par son contact avec une des couronnes fixes (34, 35) de friction ou à denture vient ajouter au mouvement excentrique du plateau (24) un mouvement de rotation de celui-ci, le disque intercalaire (17) étant solidaire en rotation de la partie centrale du plateau de ponçage (24).
  2. Ponceuse excentrique selon la revendication 1, caractérisée en ce que le disque intercalaire peut être échangé avec un autre disque.
  3. Ponceuse excentrique selon la revendication 1, caractérisée en ce qu'au moins deus couronnes fixes (34, 35) de friction ou à denture sont solidaires de son carter et que chacun des disques intercalaires (17, 37) utilisés porte deux types de couronnes (21, 22) de friction ou à denture, un type coopérant par contact radial externe, l'autre par contact radial interne, avec les couronnes dentées fixes (34, 35) pour obtenir des mouvements de rotation du plateau de ponçage (24) différant par leurs vitesses de rotation.
  4. Ponceuse excentrique selon l'une des revendications 1 à 3, caractérisée en ce que l'arbre excentrique (9) présente à son extrémité (13) une section non circulaire, en particulier à quatre pans, sur laquelle peut être monté de manière amovible, avec verrouillage géométrique, aussi bien le disque intercalaire (17, 37) que le plateau de ponçage (24).
  5. Ponceuse excentrique selon la revendication 4, caractérisée en ce que le disque intercalaire (17, 37) présente une ouverture centrale (25, 41) de même forme non circulaire que l'extrémité (13) de l'arbre excentrique (9) et que le plateau de ponçage (24) est appliqué par sa partie centrale (23), autour de l'anneau (19, 40) sur le disque intercalaire (17, 37).
  6. Ponceuse excentrique selon l'une des revendications précédentes, caractérisée en ce que le disque intercalaire (17, 37) est en contact avec l'arbre excentrique (9) et présente des ouvertures de ventilation (20, 42) permettant à l'air venant des ouvertures de ventilation (28) du plateau de ponçage de parvenir à une turbine de ventilation (8).
  7. Ponceuse excentrique selon l'une des revendications précédentes, caractérisée en ce qu'un autre disque intercalaire amovible (37) porte des couronnes non dentées et présente sur l'une de ses faces quatre bras en relief (43) dirigés radialement vers l'extérieur par rapport à l'anneau (40) et s'engageant avec verrouillage géométrique dans des encoches (44) de la turbine de ventilation (8).
  8. Ponceuse excentrique selon l'une des revendications précédentes, caractérisée en ce que le disque intercalaire (17, 37) est réalisé en métal, en particulier en aluminium coulé sous pression, tandis que les couronnes dentées (34, 35) solidaires du carter (6) sont réalisées en matière plastique et peuvent, une fois usées, être facilement remplacées.
  9. Ponceuse excentrique selon l'une des revendications 1 à 6, caractérisée en ce que le disque en métal (17) porte des couronnes dentées en matière plastique, tandis que les couronnes dentées (34, 35) solidaires du carter (6) sont en métal.
  10. Ponceuse excentrique selon l'une des revendications précédentes, caractérisée en ce que le plateau de ponçage (24) présente quatorze ouvertures de ventilation (28), dont six sont symétriquement reparties deux à deux sur un cercle d'un diamètre d'environ 80 mm tandis que les huit autres sont symétriquement réparties deux à deux sur un cercle de diamètre d'environ 65 mm.
EP89901938A 1988-03-24 1989-02-02 Meuleuse excentrique Expired - Lifetime EP0406247B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3809930A DE3809930A1 (de) 1988-03-24 1988-03-24 Exzenterschleifer
DE3809930 1988-03-24

Publications (2)

Publication Number Publication Date
EP0406247A1 EP0406247A1 (fr) 1991-01-09
EP0406247B1 true EP0406247B1 (fr) 1992-12-02

Family

ID=6350574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89901938A Expired - Lifetime EP0406247B1 (fr) 1988-03-24 1989-02-02 Meuleuse excentrique

Country Status (4)

Country Link
US (2) US5170588A (fr)
EP (1) EP0406247B1 (fr)
DE (2) DE3809930A1 (fr)
WO (1) WO1989009114A1 (fr)

Families Citing this family (42)

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DE9003410U1 (fr) * 1990-03-23 1990-06-28 Nied, Hans Rainer, 8760 Miltenberg, De
US5081794A (en) 1990-08-17 1992-01-21 Haney Donald E Sander with orbiting platen and abrasive
GB9123502D0 (en) * 1991-11-06 1992-01-02 Black & Decker Inc Sanding apparatus
JP3063872B2 (ja) * 1992-06-08 2000-07-12 株式会社マキタ 研磨機
DE4233728A1 (de) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Exzentertellerschleifer
DE4233727A1 (de) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Exzentertellerschleifer
US5319888A (en) * 1992-11-13 1994-06-14 Dynabrade, Inc. Random orbital sander
US5392568A (en) * 1993-12-22 1995-02-28 Black & Decker Inc. Random orbit sander having braking member
US5580302A (en) * 1994-02-28 1996-12-03 Black & Decker Inc. Random orbit sander having air directing baffle
GB9423848D0 (en) * 1994-11-25 1995-01-11 Black & Decker Inc Improved oscillating hand tool
DE19608969A1 (de) * 1996-03-08 1997-09-11 Bosch Gmbh Robert Elektrische Handschleifmaschine
CA2220776A1 (fr) * 1996-11-13 1998-05-13 Allen Sommers Systeme de chargement de rectifieuse excentrique
US5851141A (en) * 1996-12-09 1998-12-22 Elmore; Ronald W. Elongated orbital power sander
US5879228A (en) * 1997-11-14 1999-03-09 Sun; Yung-Yung Pneumatic grinding/polishing machine
US6007414A (en) * 1998-05-13 1999-12-28 Tsai; James Polishing machine
US6213851B1 (en) 1998-07-07 2001-04-10 Delta International Machinery Corp. Abrading apparatus
DE19945060B4 (de) * 1999-09-20 2010-12-02 Robert Bosch Gmbh Schleifhandwerkzeugmaschine
DE19952108B4 (de) * 1999-10-29 2007-09-20 Robert Bosch Gmbh Exzentertellerschleifmaschine
DE20023967U1 (de) * 2000-03-14 2008-02-28 Robert Bosch Gmbh Elektrohandschleifmaschine, insbesondere Exzenterschleifer
US6343982B1 (en) * 2000-08-15 2002-02-05 Yung Yung Sun Pneumatic sander structure
DE10047202A1 (de) * 2000-09-23 2002-04-11 Bosch Gmbh Robert Motorgetriebene Handschleifmaschine
DE10134308A1 (de) * 2001-07-14 2003-01-30 Bosch Gmbh Robert Handwerkzeugmaschine
US6758731B2 (en) * 2001-08-10 2004-07-06 One World Technologies Limited Orbital sander
US6743086B2 (en) * 2001-08-10 2004-06-01 3M Innovative Properties Company Abrasive article with universal hole pattern
ATE372080T1 (de) * 2002-12-03 2007-09-15 Johnson & Son Inc S C Motorisch angetriebenes reinigungs-/poliergerät
US7565712B2 (en) * 2003-11-26 2009-07-28 S.C. Johnson & Son, Inc. Powered cleaner/polisher
DE102004055271A1 (de) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Exzentervorrichtung
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US7625265B2 (en) * 2007-01-12 2009-12-01 I.T., Inc. Hood plates for handheld grinding tools
DE102010027205A1 (de) * 2010-07-06 2012-01-12 C. & E. Fein Gmbh Handwerkzeug
US10099343B2 (en) * 2010-11-15 2018-10-16 3M Innovative Properties Company Abrasive disc with universal hole pattern
CN102229108B (zh) * 2011-06-29 2013-02-27 郑爱军 金刚石无尘泵水磨头
DE102012214382A1 (de) * 2012-08-13 2014-05-22 Robert Bosch Gmbh Wechselbares Schleifmittel für ein Schleifgerät mit Absaugvorrichtung
DE102014109904A1 (de) * 2014-07-15 2016-01-21 C. & E. Fein Gmbh Exzenterschleifer
US20160184963A1 (en) * 2014-12-16 2016-06-30 Dustless Depot, Llc Dust shroud with internal impeller and adjustable mounting mechanism
DE102017108426A1 (de) 2017-04-20 2018-10-25 Ferrobotics Compliant Robot Technology Gmbh Schleifmaschine zum robotergestützten Schleifen
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
CN108527124A (zh) * 2018-03-30 2018-09-14 陈长胜 一种新型的医疗器械加工设备
USD908149S1 (en) 2018-10-23 2021-01-19 Dustless Depot Llc Angle grinder dust shroud with variable position slots for mounting brackets
US11123839B2 (en) 2018-10-23 2021-09-21 Dustless Depot Llc Grinder dust shroud with input shaft gasket and adjustable mounting mechanism
US11273505B2 (en) 2019-03-27 2022-03-15 Dustless Depot, Llc Circular saw dust collection shroud
DE102020215737A1 (de) * 2020-12-11 2022-06-15 Flex-Elektrowerkzeuge Gmbh Werkzeugmaschine

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US4467565A (en) * 1982-08-02 1984-08-28 Chicago Pneumatic Tool Company Rotary and orbital sander
DE3602571C2 (de) * 1986-01-29 1998-09-24 Bosch Gmbh Robert Exzentertellerschleifer mit einer Vorrichtung zum Verändern der Schleifbewegung
DE3609441A1 (de) * 1986-03-20 1987-09-24 Bosch Gmbh Robert Exzenterschleifer mit einer vorrichtung zum veraendern der schleifbewegung
DE3625671C1 (en) * 1986-07-29 1988-01-07 Festo Kg Eccentric plate grinder
DE3625655C1 (de) * 1986-07-29 1988-01-07 Festo Kg Exzentertellerschleifer

Also Published As

Publication number Publication date
US5453040A (en) 1995-09-26
DE3809930A1 (de) 1989-10-05
WO1989009114A1 (fr) 1989-10-05
US5170588A (en) 1992-12-15
DE58902911D1 (de) 1993-01-14
EP0406247A1 (fr) 1991-01-09

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