EP0406247A1 - Meuleuse excentrique. - Google Patents

Meuleuse excentrique.

Info

Publication number
EP0406247A1
EP0406247A1 EP19890901938 EP89901938A EP0406247A1 EP 0406247 A1 EP0406247 A1 EP 0406247A1 EP 19890901938 EP19890901938 EP 19890901938 EP 89901938 A EP89901938 A EP 89901938A EP 0406247 A1 EP0406247 A1 EP 0406247A1
Authority
EP
European Patent Office
Prior art keywords
eccentric
grinding plate
grinding
housing
grinder
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
EP19890901938
Other languages
German (de)
English (en)
Other versions
EP0406247B1 (fr
Inventor
Guenter Schaal
Fred Weinmann
Guenther Berger
Dieter Doerr
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

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
    • 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.
  • a grinder as described in DE-OS 36 09 441
  • the sprockets forming the eccentric gear are partly fixed on a toothed ring, partly directly on the grinding plate. This has the result that a pressure exerted on the edge of the grinding plate while working leads to twisting of the toothed ring arranged thereon due to the elasticity of the grinding plate and thus to interference with the eccentric gear.
  • the gearbox with six sprockets is relatively complex.
  • the eccentric grinder according to the invention with the characterizing features of the main claim has the advantage that the grinding plate has no gear parts and is only rotatably connected to the next component in its central part. This enables the use of elastic plastic for the grinding plate without deformation of the plate propagating into the gear. In addition, a reduction in the cost of the transmission is achieved because two sprockets are unnecessary compared to the prior art.
  • Advantageous further developments and improvements of the eccentric grinder specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous that the washers according to claim 5 reach up to the eccentric shaft and have a heat-conducting connection therewith. As a result, 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 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 washer 17 has a raised ring 19 on both sides, which rests on 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 on Läge 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 plugged onto the square section 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 plate 37 which has rings 38, 39 on the circumference which correspond to the toothed rings 34, 35 on the intermediate plate 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 through breaks 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 rear of the fan wheel 8, 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 imbalances, 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 is 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 can be detached, folded back or switched 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. This has the advantage that the different grinding movements can be adjusted from the outside without removing the grinding plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

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.
EP89901938A 1988-03-24 1989-02-02 Meuleuse excentrique Expired - Lifetime EP0406247B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5458533A (en) * 1992-10-07 1995-10-17 Robert Bosch Gmbh Eccentric disk sander

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
US6743086B2 (en) * 2001-08-10 2004-06-01 3M Innovative Properties Company Abrasive article with universal hole pattern
US6758731B2 (en) * 2001-08-10 2004-07-06 One World Technologies Limited Orbital sander
DE60316144T2 (de) * 2002-12-03 2007-12-13 S.C. Johnson & Son, Inc., Racine 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
DE3625655C1 (de) * 1986-07-29 1988-01-07 Festo Kg Exzentertellerschleifer
DE3625671C1 (en) * 1986-07-29 1988-01-07 Festo Kg Eccentric plate grinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8909114A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5458533A (en) * 1992-10-07 1995-10-17 Robert Bosch Gmbh Eccentric disk sander

Also Published As

Publication number Publication date
DE3809930A1 (de) 1989-10-05
US5170588A (en) 1992-12-15
DE58902911D1 (de) 1993-01-14
EP0406247B1 (fr) 1992-12-02
WO1989009114A1 (fr) 1989-10-05
US5453040A (en) 1995-09-26

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