EP0413956A2 - Outil à main avec disque de meulage - Google Patents

Outil à main avec disque de meulage Download PDF

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Publication number
EP0413956A2
EP0413956A2 EP19900113630 EP90113630A EP0413956A2 EP 0413956 A2 EP0413956 A2 EP 0413956A2 EP 19900113630 EP19900113630 EP 19900113630 EP 90113630 A EP90113630 A EP 90113630A EP 0413956 A2 EP0413956 A2 EP 0413956A2
Authority
EP
European Patent Office
Prior art keywords
hand tool
tool according
disc
intermediate cushion
sanding
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
EP19900113630
Other languages
German (de)
English (en)
Other versions
EP0413956B1 (fr
EP0413956A3 (en
Inventor
Guenther Berger
Manfred-Otto Staebler
Claus Dipl.-Ing. Kemmer
Arnulf Gutknecht
Manfred-Wilhelm Dipl.-Ing. Staebler
Albert Kleider
Martin Schmideder
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 EP0413956A2 publication Critical patent/EP0413956A2/fr
Publication of EP0413956A3 publication Critical patent/EP0413956A3/de
Application granted granted Critical
Publication of EP0413956B1 publication Critical patent/EP0413956B1/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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B24D9/085—Devices for mounting sheets on a backing plate

Definitions

  • the invention relates to a handheld power tool according to the preamble of claim 1.
  • a generic eccentric disc grinder is known from DE-OS 36 25 655. This has a sanding plate for holding sanding sheets.
  • the sanding disc is a complex component that consists of a rigid disc, firmly connected to a flat cushion layer. This is always referred to below as an integrated intermediate cushion.
  • Such grinding plates are available in three common, different embodiments. The differences correspond to the three common types of sanding sheets: with a self-adhesive back, with a velor-coated back, with a central opening for a clamping screw.
  • sanding discs that can hold both sanding sheets with velor backing and sanding sheets with a central opening for a clamping screw.
  • Other sanding discs can accommodate both sanding sheets with adhesive backing and sanding sheets with a central opening for a clamping screw.
  • All grinding discs have the common disadvantage that it is not possible to use the three common types of grinding discs on a single grinding disc.
  • the previous sanding pads with the integrated intermediate cushion have to be thrown away when they wear out
  • the hand tool according to the invention with the characterizing features of claim 1 has the advantage that all three types of grinding sheets can be used interchangeably with a single grinding plate.
  • a separate intermediate cushion that can be replaced when worn is now provided.
  • the new sanding disc now only consists of a rigid disc with a Velcro surface. The degree of hardness can thus be varied within a wide range between very hard and very soft.
  • the intermediate pad thermally insulates the sanding pad against the heat from the sanding sheet, the lifespan of the sanding pad is significantly increased - with considerable consequential savings.
  • sanding sheets with adhesive backing no longer have to be removed from the intermediate cushion when changing the sanding sheet, e.g. if a different grit is required. After removing the intermediate cushion from the sanding pad, together with the respective sanding sheet, this can be stored together with the intermediate cushion and used again.
  • the sanding plate can be equipped with the desired sanding paper by putting on another intermediate cushion.
  • FIG. 1 shows an eccentric disc grinder with a separate intermediate cushion
  • FIG. 2 shows a separate intermediate cushion with an abrasive sheet with a velor back
  • FIG. 3 shows a separate intermediate cushion with an abrasive sheet with an adhesive back.
  • An eccentric disc grinder 1 shown in FIG. 1 with a handle 3 on its upper side with an on and off switch 5 carries in its housing 7 a motor (not shown in more detail) with an output spindle 9. This carries a threaded bore 11 in an end-sided square piece 10, suitable for a hexagon socket screw 13. On the square piece 10 is a grinding plate 15, held by the Allen screw 13. The grinding plate 15 is centrally provided with a square hole 17 which fits over the square piece 10.
  • the grinding plate 15 On its free side, the grinding plate 15 is coated with a Velcro surface 19. This is associated with an intermediate cushion 21 with its first side 23, coated with a velor surface. The grinding plate 15 and the intermediate cushion 21 are provided with recesses 16, 24 for dust extraction.
  • the intermediate cushion 21 is provided with a central recess 22 into which the head of the hexagon socket screw 13 is in contact-free manner can protrude.
  • the second side 25 of the intermediate pad 21 opposite the first side 23 is provided for receiving an abrasive sheet, not shown, which should rest against the second side 25 with its rear side and can be fixed by means of a Velcro fastener, adhesive surface or additional, central retaining screw.
  • An intermediate cushion 31 shown in FIG. 2 is provided on its first side 33 with a velor surface.
  • the intermediate cushion 31 can thus be attached to a grinding plate (not shown).
  • the intermediate cushion 31 is coated with a Velcro surface.
  • a sanding sheet 37 can be fixed to this with a velor back 39.
  • the intermediate pad 31 and the sanding sheet 21 are provided with recesses 16, 24 for dust extraction.
  • An intermediate cushion 41 shown in FIG. 3 is coated on its first side 43 with velor and can be attached to the Velcro surface of a sanding plate (not shown). On its second side 45, the intermediate cushion 41 is provided with a smooth, artificial leather-like layer. A sanding sheet 47 can be attached to this with its adhesive back 49. The intermediate pad 41 and the sanding sheet 47 are provided with recesses 44, 48 for dust extraction.
  • the mounting of the sanding plate 15, the intermediate pads 21, 31, 41 and the sanding sheets 37, 47 on the eccentric plate grinder is done in the following way: First, the sanding plate 15 with its square hole 17 is pushed over the square piece 10 of the output spindle 9. The Allen screw 13 is screwed into the threaded bore 11 so that the grinding plate 15 sits on the output shaft 9 in a rotationally fixed manner.
  • the intermediate cushion 21 is pressed with its first side 21 with a velor coating against the Velcro surface 19 and fixed thereon, that is to say held immovably and non-rotatably.
  • sanding sheets 37, 47 can be fastened with velor backs 39 or adhesive backs 49.
  • a sanding sheet with a velor back can also be attached directly to the Velcro surface 19 on the sanding plate 15. This corresponds to the greatest degree of hardness for the sanding sheet holder. If the desired degree of hardness is lower, the intermediate pad 21, 31 or 41 is to be placed on the sanding plate 15 and then a corresponding sanding sheet 37, 47 is to be fixed thereon. If, for example, a sanding sheet 47 with adhesive back 49 fixed on the sanding plate 15 by means of an intermediate pad 41 is to be exchanged for a sanding sheet 37 with a velor back, this must be replaced together with the intermediate pad 41. All that is required is to pull the intermediate pad 41 together with the sanding sheet 47 sitting thereon from the sanding plate 15 and to replace it with the sanding sheet 37 with the velor back 39.
  • the sanding sheet 47 was separated directly from the intermediate pad 41 and thus unusable. In most cases, the sanding sheet 47 tears when loosened, or sanding dust adheres to the free adhesive back in such a way that a sufficient adhesive effect on the intermediate pad 41 can no longer be achieved. In the case of an application of the invention, the sanding sheet 47 can therefore remain on the intermediate pad 41 and can always be reused after being exchanged for other types of sanding sheet with the associated intermediate pad.
  • the intermediate cushions 21, 31, 41 can also be attached to previously conventional grinding plates with an integrated intermediate cushion.
  • the grinding wheel holder has a particularly low degree of hardness.
  • the intermediate cushion according to the invention is also Can be used in conjunction with additional devices for drills or angle grinders that are suitable for holding sanding sheets with velor backs.
  • Another embodiment, not shown, of the invention consists of a thin, pliable disc, the material thickness of which is approximately 1/50 of the disc diameter.
  • Such an intermediate cushion could be, for example, a synthetic leather disc coated on one side with velor. This is particularly well suited for holding sanding sheets with adhesive backing.
  • Such a thin intermediate cushion which is provided with a Velcro coating on the synthetic leather layer side, could be advantageous for special uses for the use of sanding sheets with velor backing.
  • the arrangement of the recesses 16, 24 in the sanding plate 15 and in the intermediate cushion 21, 31, 41 on three different pitch circle diameters ensures the grinding dust extraction universally: the recesses 16, 24 fit the air passage openings of all known sanding sheets.
  • a sanding plate 150 is provided with a square hole 170 and on its free side additionally - in comparison to FIG. 1 - with elastic dowel pins 200 and coated with a Velcro surface 190.
  • the grinding plate 150 and the intermediate cushion 210 are provided with recesses 160, 240 for dust extraction.
  • the intermediate cushion 210 is provided with a central recess 220 into which the head of an interior (not shown) is free of contact hexagon screw can protrude.
  • the second side 250 of the intermediate pad 210 opposite the first side 230 is provided for receiving an abrasive sheet (not shown), the back of which should rest against the second side 250 and can be fixed by means of a Velcro fastener, adhesive surface or additional, central retaining screw.
  • the intermediate cushion 210 is provided with fitting bores 260, into which the elastic fitting pins 200 of the grinding plate 150 fit, so that the recesses 160, 240 are aligned with one another when they are plugged together.
  • FIG. 5 shows an intermediate cushion 150 with recesses 240 and a Velcro coating 250, in the place of which an adhesive-friendly, smooth coating can also be arranged, to which a steel disc 600 with velor backing 620, or with adhesive back, if the intermediate cushion 150 carries an adhesive-friendly coating, - and is assigned with dowel pins 660.
  • the dowel pins 660 coincide mirror-symmetrically with respect to their position dimensions with two recesses 240 of the intermediate cushion 150, so that when the steel disk 600 is fastened to the intermediate cushion by means of a Velcro or adhesive connection, the dowel pins 660 sit in the two associated recesses 240.
  • the steel disk 600 can also be placed on the grinding plate 150.
  • the steel disk 600 resiliently clings to the surface. Due to the high spring elasticity, a blunt immersion at the wallpaper joint is also possible. As a result of the rotary movement of the steel disk 600, the outer edge thereof is automatically sharpened when working. Due to the low speed of the sanding plate, the risk of injury for operators and the risk of damage, for example for plaster substrates, is very low. The high impact frequency as a result of the eccentric movement with high eccentricity ensures particularly good work results with the steel disc 600 in connection with eccentric disc grinders.
  • the steel disc is provided with recesses for dust extraction, which are arranged mirror-symmetrically to the recesses 240, 160.
  • the steel disc is provided with dowel pins which correspond to fitting bores located outside the recesses for dust extraction on the grinding plate or the intermediate cushion, so that the steel disc can only be operated with the grinding discs or intermediate cushion provided for this purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP90113630A 1989-08-23 1990-07-17 Outil à main avec disque de meulage Expired - Lifetime EP0413956B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3927832 1989-08-23
DE3927832 1989-08-23
DE4009876A DE4009876A1 (de) 1989-08-23 1990-03-28 Handwerkzeugmaschine mit schleifteller
DE4009876 1990-03-28

Publications (3)

Publication Number Publication Date
EP0413956A2 true EP0413956A2 (fr) 1991-02-27
EP0413956A3 EP0413956A3 (en) 1991-04-24
EP0413956B1 EP0413956B1 (fr) 1995-01-04

Family

ID=25884314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90113630A Expired - Lifetime EP0413956B1 (fr) 1989-08-23 1990-07-17 Outil à main avec disque de meulage

Country Status (2)

Country Link
EP (1) EP0413956B1 (fr)
DE (3) DE9007699U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798610A1 (fr) * 1999-09-20 2001-03-23 Bosch Gmbh Robert Ponceuse a main, notamment ponceuse orbitale
EP1733844A1 (fr) * 2005-06-13 2006-12-20 Oy Kwh Mirka Ab Produit abrasif flexible et son procédé de préparation
WO2011147957A1 (fr) 2010-05-27 2011-12-01 Pharmazell Gmbh NOUVEAUX MUTANTS KNOCK-OUT DE LA 7α-HYDROXYSTÉROÏDE DÉSHYDROGÉNASE ET LEUR UTILISATION

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190027506A (ko) * 2017-09-07 2019-03-15 (주)태룡 핸드 그라인더

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1577598A1 (de) * 1966-09-29 1969-09-18 Rheinische Zahnbohrer Und Klei Befestigung von Schleif- und Polierblaettern,Filz-,Kork- und Lederscheiben auf elastischen und unelastischen Traegerwerkzeugen
EP0112405A1 (fr) * 1982-12-24 1984-07-04 Hans J. Fabritius Elément d'attache utilisable dans des machines à meuler et à polir
EP0167679A1 (fr) * 1984-07-13 1986-01-15 Nobuhiko Yasui Appareil de polissage
EP0245638A2 (fr) * 1986-05-10 1987-11-19 Robert Bosch Gmbh Ponceuse à excentrique munie de moyens pour modifier le mouvement de ponçage
EP0285042A1 (fr) * 1987-04-01 1988-10-05 Manfred Ihmels Plateau porteur pour disques abrasifs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1577598A1 (de) * 1966-09-29 1969-09-18 Rheinische Zahnbohrer Und Klei Befestigung von Schleif- und Polierblaettern,Filz-,Kork- und Lederscheiben auf elastischen und unelastischen Traegerwerkzeugen
EP0112405A1 (fr) * 1982-12-24 1984-07-04 Hans J. Fabritius Elément d'attache utilisable dans des machines à meuler et à polir
EP0167679A1 (fr) * 1984-07-13 1986-01-15 Nobuhiko Yasui Appareil de polissage
EP0245638A2 (fr) * 1986-05-10 1987-11-19 Robert Bosch Gmbh Ponceuse à excentrique munie de moyens pour modifier le mouvement de ponçage
EP0285042A1 (fr) * 1987-04-01 1988-10-05 Manfred Ihmels Plateau porteur pour disques abrasifs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798610A1 (fr) * 1999-09-20 2001-03-23 Bosch Gmbh Robert Ponceuse a main, notamment ponceuse orbitale
GB2357054A (en) * 1999-09-20 2001-06-13 Bosch Gmbh Robert Hand-held grinder
GB2357054B (en) * 1999-09-20 2002-07-17 Bosch Gmbh Robert Hand-held grinding machine tool
EP1733844A1 (fr) * 2005-06-13 2006-12-20 Oy Kwh Mirka Ab Produit abrasif flexible et son procédé de préparation
US8206202B2 (en) 2005-06-13 2012-06-26 Oy Kwh Mirka Ab Flexible grinding product and method of producing the same
US8216030B2 (en) 2005-06-13 2012-07-10 Oy Kwh Mirka Ab Flexible grinding product and method of producing the same
WO2011147957A1 (fr) 2010-05-27 2011-12-01 Pharmazell Gmbh NOUVEAUX MUTANTS KNOCK-OUT DE LA 7α-HYDROXYSTÉROÏDE DÉSHYDROGÉNASE ET LEUR UTILISATION

Also Published As

Publication number Publication date
DE4009876A1 (de) 1991-02-28
DE59008180D1 (de) 1995-02-16
EP0413956B1 (fr) 1995-01-04
DE9007699U1 (de) 1994-06-16
EP0413956A3 (en) 1991-04-24

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